CN114739200B - Sector anti-freezing control method and system and surface type indirect cooling system sector - Google Patents
Sector anti-freezing control method and system and surface type indirect cooling system sector Download PDFInfo
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- CN114739200B CN114739200B CN202210407384.3A CN202210407384A CN114739200B CN 114739200 B CN114739200 B CN 114739200B CN 202210407384 A CN202210407384 A CN 202210407384A CN 114739200 B CN114739200 B CN 114739200B
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- 238000007710 freezing Methods 0.000 title claims abstract description 141
- 238000001816 cooling Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000011217 control strategy Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 313
- 230000002528 anti-freeze Effects 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 12
- 238000007689 inspection Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 17
- 230000008014 freezing Effects 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000009746 freeze damage Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/005—Auxiliary systems, arrangements, or devices for protection against freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A sector anti-freezing control method, a system and a surface type indirect cooling system sector, wherein the method comprises the following steps: acquiring a low-temperature anti-freezing mode signal of a sector of the surface type indirect cooling system; determining the working state of a sector; determining an anti-freezing protection triggering condition of a sector; and executing a corresponding anti-freezing control strategy on the sector under the working state according to the low-temperature anti-freezing mode signal and the anti-freezing protection triggering condition. The sector antifreezing control method provided by the embodiment of the invention can cover all states of sector work, reasonably classifies and unifies sector fault processing actions, achieves the effects of comprehensive protection scope and simple control logic, reduces workload of debugging and operation and inspection staff, improves control performance of a surface indirect air cooling system, improves applicability and safety of a unit in winter and summer, improves economic benefit in a factory, provides references for debugging and operation and inspection of the surface indirect air cooling system of domestic chemical or thermal power plants, and has application universality and universality.
Description
Technical Field
The invention relates to the technical field of indirect air cooling control of thermal generator sets, in particular to a sector anti-freezing control method and system and a surface type indirect cooling system sector.
Background
In the areas of China especially lacking water, partial large-scale thermal power plants and chemical enterprises, the exhaust steam cooling of the steam turbine mainly adopts an air cooling system, and compared with a direct air cooling system and an indirect air cooling system, the indirect air cooling system has low sensitivity to environmental factors and higher efficiency, so that surface type indirect air cooling is often adopted. At present, although the domestic surface type indirect air cooling is applied more, the control system has a plurality of problems from debugging to production operation due to the fine deviation of control concepts and design types: the complicated procedure leads to debugging, the operation maintenance work load is big, and the practicality that programming and actually have deviation to lead to is poor.
The related prior art at present adopts facing processes for controlling the technological process, is not considered from the technological state, and is complicated in fault treatment of the control process, for example, water filling program control is divided into a plurality of links, wherein water filling is stopped and water discharging program control is started when a plurality of steps are in fault, so that the configuration and debugging are large in workload and easy to make mistakes.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a sector anti-freezing control method, which solves the problems that the control process and the fault debugging process of the sector of the current surface type indirect air cooling system are too complicated, and the operation and maintenance workload is too great.
The invention also provides a surface type indirect cooling system sector and a sector anti-freezing control system.
According to an embodiment of the first aspect of the invention, the sector antifreeze control method comprises the following steps:
acquiring a low-temperature anti-freezing mode signal of a sector of a surface type indirect cooling system, wherein the low-temperature anti-freezing mode signal is acquired according to the external environment temperature of an indirect cooling tower where the sector is acquired;
determining the working state of the sector, wherein the working state comprises a water filling triggering state and a water discharging triggering state;
determining the anti-freezing protection triggering conditions of the sector, wherein the anti-freezing protection triggering conditions comprise sector valve faults, water filling sequence control failures, drainage sequence control failures and sector water outlet temperature lower than a temperature threshold;
and executing corresponding anti-freezing control strategies on the sector under the working state according to the low-temperature anti-freezing mode signal and the anti-freezing protection triggering condition, wherein the anti-freezing control strategies comprise a sector emptying water strategy and a sector refilling water strategy.
The sector anti-freezing control method provided by the embodiment of the invention has at least the following technical effects: the external ring temperature of the indirect cooling tower where the surface type indirect cooling system sector is located is collected, so that the sector is determined to execute an anti-freezing control strategy on the premise of a low-temperature anti-freezing mode. And before executing the anti-freezing control strategy, determining the anti-freezing protection triggering condition of the sector and the working state of the sector so as to perform specific and corresponding anti-freezing measures. The sector antifreezing control method provided by the embodiment of the invention can cover all states of sector work, reasonably classifies and unifies sector fault processing actions, achieves the effects of comprehensive protection scope and simple control logic, reduces workload of debugging and operation and inspection staff, improves control performance of a surface indirect air cooling system, improves applicability and safety of a unit in winter and summer, improves economic benefit in a factory, provides references for debugging and operation and inspection of the surface indirect air cooling system of domestic chemical or thermal power plants, and has universality.
According to some embodiments of the invention, the judging basis of the working state includes:
the judgment basis of the water filling triggering state is that a hot water inlet valve is opened, a hot water drain valve is closed, a cold water outlet valve is opened, and a cold water drain valve is closed;
the judgment basis of the drainage triggering state is that the hot water inlet valve is closed, the hot water drainage valve is opened, the cold water outlet valve is closed, and the cold water drainage valve is opened.
According to some embodiments of the invention, if the valve of the sector is fully open, the valve performs open feedback; if the valve is completely closed, the valve performs closing feedback; if the valve is not fully opened or not fully closed, the valve does not perform feedback; sector valves normally include:
the hot water inlet valve performs the open feedback and the cold water outlet valve performs the open feedback;
the hot water inlet valve performs the shut-off feedback and the cold water outlet valve performs the shut-off feedback;
the hot water drain valve performs the open feedback and the cold water drain valve performs the open feedback;
the hot water drain valve performs the off feedback and the cold water drain valve performs the off feedback;
the hot water inlet valve does not perform feedback and the cold water outlet valve does not perform feedback;
the hot water drain valve does not perform feedback and the cold water drain valve does not perform feedback;
the judging basis of the sector valve faults comprises sector valve feedback conditions except for the sector valve normal.
According to some embodiments of the invention, the sector drain strategy includes closing a hot water inlet valve, opening a hot water drain valve, closing a cold water outlet valve, and opening a cold water drain valve; the sector refill strategy includes opening a hot water inlet valve, closing a hot water drain valve, opening a cold water outlet valve, and closing a cold water drain valve.
According to some embodiments of the present invention, the executing, according to the low-temperature antifreeze mode signal and the antifreeze protection triggering condition, a corresponding antifreeze control strategy for the sector in the working state includes the following steps:
triggering a low-temperature anti-freezing mode to work by the low-temperature anti-freezing mode signal, and determining the working state of the sector in the low-temperature anti-freezing mode;
if the sector is in the water filling triggering state, continuing to determine the anti-freezing protection triggering condition;
if the anti-freezing protection triggering condition is that the sector valve fails, executing the sector refilling strategy;
if the anti-freezing protection triggering condition is that the water filling sequence control fails, executing the sector refilling strategy;
if the anti-freezing protection triggering condition is that the drainage sequence control fails, executing the sector refilling strategy;
and if the anti-freezing protection triggering condition is that the water outlet temperature of the sector is lower than a temperature threshold value, executing the sector water draining strategy.
According to some embodiments of the present invention, the executing, according to the low-temperature antifreeze mode signal and the antifreeze protection triggering condition, a corresponding antifreeze control strategy for the sector in the working state further includes the following steps:
if the sector is in the drainage triggering state, continuing to determine the anti-freezing protection triggering condition;
if the anti-freezing protection triggering condition is that the sector valve fails, executing the sector water draining strategy;
if the anti-freezing protection triggering condition is that the water filling sequence control fails, executing the sector water draining strategy;
and if the anti-freezing protection triggering condition is that the drainage sequence control fails, executing the sector drainage strategy.
According to some embodiments of the invention, the close shutter strategy will be performed at the same time as the sector drain water strategy or the sector refill strategy is performed.
A surface-type inter-cooling system sector according to an embodiment of the second aspect of the present invention includes:
the sector water storage unit is provided with a hot water inlet, a cold water outlet, a hot water outlet and a cold water outlet and is used for placing filled circulating water;
the valve bank comprises a hot water inlet valve, a hot water drain valve, a cold water outlet valve and a cold water drain valve, wherein the hot water inlet valve is connected with the hot water inlet, the hot water drain valve is connected with the hot water drain outlet, the cold water outlet valve is connected with the cold water outlet, and the cold water drain valve is connected with the cold water drain outlet.
The surface type inter-cooling system sector provided by the embodiment of the invention has at least the following technical effects: the sector antifreezing control method of the embodiment of the first aspect is applied to the sector of the surface indirect air cooling system of the second aspect, so that the valve opening and closing states of the valve group representing all working states of the sector can be covered, the fault handling actions of the sector can be reasonably classified and unified, the effect of comprehensive protection scope and simple control logic is achieved, the workload of debugging and operation and inspection personnel is reduced, the control performance of the surface indirect air cooling system is improved, the applicability and safety of a unit in winter and summer are improved, the economic benefit in a factory is improved, references are provided for debugging and operation and inspection of the surface indirect air cooling system of a domestic chemical industry or thermal power plant, and the application is wide and universal.
According to a third aspect of the invention, a sector antifreeze control system is applied to a surface type indirect cooling system sector, and comprises:
the temperature acquisition unit is used for acquiring the external environment temperature data of the indirect cooling tower where the surface type indirect cooling system sector is located;
the signal conversion unit is used for converting the external environment temperature data which accords with the operation triggering the low-temperature anti-freezing mode into a low-temperature anti-freezing mode signal;
the working state acquisition unit is used for acquiring the working state of the surface type indirect cooling system sector, wherein the working state comprises a water filling triggering state and a water discharging triggering state;
the trigger condition acquisition unit is used for acquiring the anti-freezing protection trigger conditions of the surface type inter-cooling system sector, wherein the anti-freezing protection trigger conditions comprise sector valve faults, water filling sequence control failures, drainage sequence control failures and sector water outlet temperature lower than a temperature threshold;
an anti-freezing control unit for executing the sector anti-freezing control method according to any one of the embodiments of the first aspect of the present invention.
The sector anti-freezing control system provided by the embodiment of the invention has at least the following technical effects: the temperature acquisition unit, the signal conversion unit, the working state acquisition unit and the triggering condition acquisition unit are utilized to acquire all relevant preconditions for executing the anti-freezing control strategy, so that the anti-freezing control unit can execute the corresponding anti-freezing control strategy on the sector at low temperature. The sector anti-freezing control system provided by the embodiment of the invention can cover all states of sector work, reasonably classifies and unifies sector fault processing actions, achieves the effects of comprehensive protection range and simple control logic, reduces workload of debugging and operation and inspection staff, improves control performance of a surface indirect air cooling system, improves applicability and safety of a unit in winter and summer, improves economic benefits in factories, provides references for debugging and operation and inspection of the surface indirect air cooling system of domestic chemical or thermal power plants, and has universality.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a sector freeze control method of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sector of a surface-type indirect-cooling system according to an embodiment of the present invention;
fig. 3 is a connection diagram of a sector freeze protection control system of an embodiment of the present invention.
Reference numerals:
sector water storage unit 100,
Valve block 200, hot water inlet valve 210, hot water drain valve 220, cold water outlet valve 230, cold water drain valve 240,
A temperature acquisition unit 300,
A signal conversion unit 400,
An operating state acquisition unit 500,
A trigger condition acquisition unit 600,
The antifreeze control unit 700.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, disconnection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.
A sector freeze control method according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 3.
The sector anti-freezing control method of the embodiment of the invention comprises the following steps:
acquiring a low-temperature anti-freezing mode signal of a sector of the surface type indirect cooling system, wherein the low-temperature anti-freezing mode signal is acquired according to the external environment temperature of an indirect cooling tower where the acquisition sector is located;
determining the working state of the sector, wherein the working state comprises a water filling triggering state and a water discharging triggering state;
determining the anti-freezing protection triggering conditions of the sector, wherein the anti-freezing protection triggering conditions comprise sector valve faults, water filling sequence control failures, water discharging sequence control failures and sector water outlet temperature lower than a temperature threshold value;
and executing corresponding anti-freezing control strategies on the sector under the working state according to the low-temperature anti-freezing mode signal and the anti-freezing protection triggering condition, wherein the anti-freezing control strategies comprise a sector emptying water strategy and a sector refilling water strategy.
Referring to fig. 1 to 3, under the winter low temperature condition, the low temperature data is converted into the low temperature anti-freezing mode signal by collecting the external environment temperature of the indirect cooling tower where the sector is located, so as to trigger the low temperature anti-freezing mode, and the relevant anti-freezing control strategy is continuously executed on the premise of starting the low temperature anti-freezing mode. Specifically, the actual sector includes five states: the water filling completion state, the water draining completion state and the sector water storage state are three working stable states of the sector; the water filling process state and the water discharging process state are transition states between three working stable states. Because the five states are in continuous transformation, the five states are simplified into two working states of a water filling triggering state and a water discharging triggering state, so that the number of judgment bases for executing an anti-freezing strategy is reduced, and the execution efficiency is improved.
For each anti-freezing protection triggering condition, the method specifically comprises the following steps: the sector valve faults comprise valve feedback faults, valve position feedback changes caused by valve drift of an actuating mechanism, valve non-action, valve action stopping halfway, valve action instruction response faults and the like in practice, so that the situations can be totally classified as sector valve faults to simplify the execution process of the steps; the water filling sequence control and the water discharging sequence control specifically refer to that an operator performs water filling action and water discharging action through manual operation, and the water filling sequence control failure and the water discharging sequence control failure are specifically embodied in sequence control step overtime, sequence control termination condition triggering, program self failure and the like. These situations may cause frost cracking risk in the sector, and certainly, the fact that the temperature of the effluent water of the sector is lower than the temperature threshold is the most direct cause of the frost cracking of the sector, so that a corresponding frost protection control strategy is needed.
For sector drain water strategies, it is specifically the water within the sector tube bundle that is drained clean so that the sector is free of frozen expansion medium and thus free of frost crack risk. For the sector refilling strategy, the sector is filled with circulating water with higher water temperature, so that the water is in a flowing state and can timely supplement heat taken away by an external cold source, and the water temperature is kept above the freezing temperature.
According to the sector anti-freezing control method provided by the embodiment of the invention, the external environment temperature of the indirect cooling tower where the surface type indirect cooling system sector is located is collected, so that the sector is determined to execute an anti-freezing control strategy on the premise of a low-temperature anti-freezing mode. And before executing the anti-freezing control strategy, determining the anti-freezing protection triggering condition of the sector and the working state of the sector so as to perform specific and corresponding anti-freezing measures. The sector antifreezing control method provided by the embodiment of the invention can cover all states of sector work, reasonably classifies and unifies sector fault processing actions, achieves the effects of comprehensive protection scope and simple control logic, reduces workload of debugging and operation and inspection staff, improves control performance of a surface indirect air cooling system, improves applicability and safety of a unit in winter and summer, improves economic benefit in a factory, provides references for debugging and operation and inspection of the surface indirect air cooling system of domestic chemical or thermal power plants, and has universality.
In some embodiments of the present invention, the judging basis of the working state includes:
the water filling triggering state is judged according to the conditions that a hot water inlet valve 210 is opened, a hot water drain valve 220 is closed, a cold water outlet valve 230 is opened, and a cold water drain valve 240 is closed;
the water discharge triggering state is judged according to the condition that the hot water inlet valve 210 is closed, the hot water discharge valve 220 is opened, the cold water outlet valve 230 is closed, and the cold water discharge valve 240 is opened.
Specifically, the judging basis of the five states of the sector in practice is specifically: the filling process state is that the hot water inlet valve 210 is in the opening process, the hot water drain valve 220 is in the closing process, the cold water outlet valve 230 is in the opening process, and the cold water drain valve 240 is in the closing process; the water filling completion state is that the hot water inlet valve 210 has been fully opened, the hot water drain valve 220 has been fully closed, the cold water outlet valve 230 has been fully opened, and the cold water drain valve 240 has been fully closed; the sector water storage state is that the hot water inlet valve 210 has been completely closed, the hot water drain valve 220 has been completely closed, the cold water outlet valve 230 has been completely closed, and the cold water drain valve 240 has been completely closed; the drainage process state is that the hot water inlet valve 210 is in the closing process, the hot water drain valve 220 is in the opening process, the cold water outlet valve 230 is in the closing process, and the cold water drain valve 240 is in the opening process; the drainage complete state is that the hot water inlet valve 210 has been completely closed, the hot water drain valve 220 has been completely opened, the cold water outlet valve 230 has been completely closed, and the cold water drain valve 240 has been completely opened. Therefore, the valve states in the five states can be summarized and classified into the water filling triggering state and the water discharging triggering state, so that excessive and complex judgment bases are reduced, and the execution efficiency of the whole method is improved.
In some embodiments of the invention, if the sector's valve is fully open, the valve performs open feedback; if the valve is completely closed, the valve performs closing feedback; if the valve is not fully opened or not fully closed, the valve does not execute feedback; sector valves normally include:
the hot water inlet valve 210 performs an open feedback and the cold water outlet valve 230 performs an open feedback;
the hot water inlet valve 210 performs a closing feedback and the cold water outlet valve 230 performs a closing feedback;
the hot water drain valve 220 performs an open feedback and the cold water drain valve 240 performs an open feedback;
the hot water drain valve 220 performs off feedback and the cold water drain valve 240 performs off feedback;
the hot water inlet valve 210 does not perform feedback and the cold water outlet valve 230 does not perform feedback;
the hot water drain valve 220 does not perform feedback and the cold water drain valve 240 does not perform feedback;
the judgment basis of the sector valve faults comprises the feedback condition of the sector valve except the normal sector valve.
Specifically, since the hot water inlet valve 210 and the cold water outlet valve 230 are opened and closed in the normal operation of the sector, the hot water drain valve 220 and the cold water drain valve 240 are opened and closed in the same manner. In practice, the four valves of the sector are in an opened or closed steady state, or an intermediate state during the opening or closing process, or a state in which the valves are suspended to be opened or closed when the valves fail, etc. Therefore, in some embodiments, the judging basis of the sector valve fault is to take the state of the valve after opening or closing into consideration, and the open feedback, the close feedback and the non-execution feedback executed by the valve are utilized to summarize various states, and logic operation is performed on the states to determine whether the sector valve is faulty. The specific logic operation is as follows: the open feedback is represented by 1, the closed feedback is represented by 0, or the feedback is not executed, the valve states of the hot water inlet valve 210 and the cold water outlet valve 230 are xored to obtain a first output state, the valve states of the hot water outlet valve 220 and the cold water outlet valve 240 are xored to obtain a second output state, and finally the first output state and the second output state are xored to obtain a valve output state. If the on/off states of the hot water inlet valve 210 and the cold water outlet valve 230 are not consistent, or the on/off states of the hot water drain valve 220 and the cold water drain valve 240 are not consistent, the valve output state is 1, namely, the valve failure is indicated, according to the logic operation; otherwise, if the hot water inlet valve 210 and the cold water outlet valve 230 are opened and closed simultaneously, or the hot water drain valve 220 and the cold water drain valve 240 are opened and closed simultaneously, the output state of the valve is 0, which means that the valve is normal.
In some embodiments of the present invention, the sector drain strategy includes closing the hot water inlet valve 210, opening the hot water drain valve 220, closing the cold water outlet valve 230, and opening the cold water drain valve 240; the sector refill strategy includes opening the hot water inlet valve 210, closing the hot water drain valve 220, opening the cold water outlet valve 230, and closing the cold water drain valve 240.
Specifically, the execution of the sector emptying water strategy and the sector refilling water strategy is realized by readjusting the opening and closing states of the valves, which accords with the simplification of control operation, and the drainage and the filling of water are realized without taking complex steps for the sectors, so that the workload is reduced, and the operation efficiency is improved. Meanwhile, in practice, the sector emptying water strategy and the sector refilling water strategy are mutually locked so as to avoid command collision.
In some embodiments of the present invention, according to the low temperature antifreeze mode signal and the antifreeze protection triggering condition, executing a corresponding antifreeze control strategy for the sector in the working state, including the following steps:
triggering a low-temperature anti-freezing mode to work by a low-temperature anti-freezing mode signal, and determining the working state of a sector in the low-temperature anti-freezing mode;
if the sector is in the water filling triggering state, continuing to determine the anti-freezing protection triggering condition;
if the anti-freezing protection triggering condition is a sector valve fault, executing a sector refilling strategy;
if the anti-freezing protection triggering condition is that the water filling sequence control fails, executing a sector refilling strategy;
if the anti-freezing protection triggering condition is that the drainage sequence control fails, executing a sector refilling strategy;
and if the anti-freezing protection triggering condition is that the sector outlet water temperature is lower than the temperature threshold value, executing a sector emptying water strategy.
Specifically, under the low-temperature anti-freezing mode, when the sector is in a water filling triggering state, if the sector valve fails, the operation of water filling or water discharging sequential control is needed to be stopped firstly in practice so as to avoid conflict with an anti-freezing control strategy, then the sector refilling strategy is executed, and at the moment, the sector refilling strategy is executed, and the valve is basically restored to normal work by readjusting the opening and closing states of the valves, so that the risk of freezing damage caused by incomplete water filling of the sector due to the valve failure is prevented; if the water filling sequence control fails, because the valve is not failed, a sector re-filling strategy is executed at the moment, and the water filling operation is essentially performed again to ensure that the sector is filled normally; if the drainage sequence control fails, because the valve is not failed, a sector refilling strategy is executed at the moment, and essentially, the sector filled with water is continuously filled, so that the water in the sector circularly flows, and the effect of preventing the sector from freezing can be achieved; if the sector water outlet temperature is lower than the temperature threshold value, a sector water draining strategy must be implemented, and when the temperature is too low, even if hot water is filled, a certain water solidification condition exists finally, so that the water in the sector is drained completely, and the occurrence of freeze damage is completely prevented.
In some embodiments of the present invention, according to the low temperature antifreeze mode signal and the antifreeze protection triggering condition, executing a corresponding antifreeze control strategy for the sector in the working state, further comprising the steps of:
if the sector is in the drainage triggering state, continuing to determine the anti-freezing protection triggering condition;
if the anti-freezing protection triggering condition is a sector valve fault, executing a sector water draining strategy;
if the anti-freezing protection triggering condition is that the water filling sequence control fails, executing a sector water draining strategy;
and if the anti-freezing protection triggering condition is that the drainage sequence control fails, executing a sector drainage strategy.
Specifically, if the sector valve fails, the operation of water filling or water draining sequential control needs to be stopped in practice so as to avoid conflict with the anti-freezing control strategy, then the sector water draining strategy is executed, and the sector water draining strategy is executed at the moment, which essentially enables the valve to recover normal work by readjusting the on-off state of each valve, thereby preventing the risk of freezing damage caused by incomplete water draining of the sector due to the valve failure; if the drainage sequence control fails, because the valve is not failed, the sector drainage strategy is executed at the moment, and the drainage operation is essentially performed once again to ensure that the sector drainage is normal; if the water filling sequence control fails, because the valve is not failed, the sector draining water strategy is executed at the moment, and the sector is essentially continuously drained, so that the water in the sector can be ensured to be completely drained.
In some embodiments of the present invention, the close shutter strategy will be performed at the same time as the sector drain water strategy or the sector refill strategy is performed.
Specifically, due to valve failure, failure of water filling sequential control operation, failure of water discharging sequential operation, etc., the anti-freezing requirement cannot be immediately realized. Therefore, in practice, when the anti-freezing control strategy is executed, the shutter closing strategy can be synchronously executed to reduce the fluidity of cold air in the air-cooling tower, so as to reduce the heat taken away by the sector, thereby accelerating the speed of realizing the anti-freezing requirement and strengthening the anti-freezing effect of the anti-freezing control strategy.
A surface-type inter-cooling system sector according to an embodiment of the second aspect of the present invention includes: sector water storage unit 100, valve group 200. The sector water storage unit 100 is provided with a hot water inlet, a cold water outlet, a hot water outlet and a cold water outlet, and the sector water storage unit 100 is used for placing filled circulating water; the valve block 200 includes a hot water inlet valve 210, a hot water outlet valve 220, a cold water outlet valve 230, and a cold water outlet valve 240, wherein the hot water inlet valve 210 is connected to a hot water inlet, the hot water outlet valve 220 is connected to a hot water outlet, the cold water outlet valve 230 is connected to a cold water outlet, and the cold water outlet valve 240 is connected to a cold water outlet.
Referring to fig. 2, the water in the sector water storage unit 100 is circulated by filling the circulation water through the hot water inlet valve 210 and outputting the circulation water through the cold water outlet valve 230. The water in the sector-out water unit can be discharged to the underground water tank through the hot water drain valve 220 and the cold water drain valve 240. Therefore, the sector anti-freezing control method of the first aspect of the invention can be used for controlling the four valves of the sector of the surface type indirect cooling system of the second aspect of the invention, so as to realize the anti-freezing control of the sector.
According to the surface type indirect air cooling system sector, the sector anti-freezing control method of the first aspect is applied to the surface type indirect air cooling system sector of the second aspect, so that the valve on-off states of the valve group 200 representing all working states of the sector can be covered, the sector fault processing actions can be reasonably classified and unified, the effects of comprehensive protection scope and simple control logic are achieved, the workload of debugging and operation checking staff is reduced, the control performance of the surface type indirect air cooling system is improved, the applicability and safety of a unit in winter and summer are improved, the economic benefit in a factory is improved, references are provided for debugging and operation checking of the surface type indirect air cooling system of a domestic chemical or thermal power plant, and the application is wide and universal.
According to a third aspect of the invention, a sector antifreeze control system is applied to a surface type indirect cooling system sector, and comprises: the system comprises a temperature acquisition unit 300, a signal conversion unit 400, an operating state acquisition unit 500, a trigger condition acquisition unit 600 and an anti-freezing control unit 700. The temperature acquisition unit 300 is used for acquiring the external environment temperature data of the indirect cooling tower where the surface type indirect cooling system sector is located; the signal conversion unit 400 is used for converting the external environment temperature data which accords with the operation triggering the low-temperature anti-freezing mode into a low-temperature anti-freezing mode signal; the working state acquisition unit 500 is used for acquiring the working state of the surface type indirect cooling system sector, wherein the working state comprises a water filling triggering state and a water discharging triggering state; the trigger condition acquisition unit 600 is configured to acquire an anti-freezing protection trigger condition of a sector of the surface-type indirect cooling system, where the anti-freezing protection trigger condition includes a failure of a sector valve, a failure of water filling sequence control, a failure of water draining sequence control, and a temperature of water outlet of the sector being lower than a temperature threshold; the antifreeze control unit 700 is for executing the sector antifreeze control method according to any one of the embodiments of the first aspect of the present invention.
Referring to fig. 3, the temperature acquisition unit 300 transmits the acquired external environmental temperature data of the inter-cooling tower in which the sector is located to the signal conversion unit 400, and the signal conversion unit 400 converts the external environmental temperature data meeting the low temperature requirement into a low temperature anti-freezing mode signal to trigger the low temperature anti-freezing mode to operate; the working state of the sector and the relevant preconditions for triggering the anti-freezing strategy are acquired by the working state acquisition unit 500 and the triggering condition acquisition unit 600 and transmitted to the anti-freezing control unit 700 to execute the corresponding anti-freezing control strategy.
According to the sector freezing control system of the embodiment of the invention, the temperature acquisition unit 300, the signal conversion unit 400, the working state acquisition unit 500 and the trigger condition acquisition unit 600 are utilized to acquire each relevant precondition for executing the freezing control strategy, so that the freezing control unit 700 can execute the corresponding freezing control strategy on the sector at low temperature. The sector anti-freezing control system provided by the embodiment of the invention can cover all states of sector work, reasonably classifies and unifies sector fault processing actions, achieves the effects of comprehensive protection range and simple control logic, reduces workload of debugging and operation and inspection staff, improves control performance of a surface indirect air cooling system, improves applicability and safety of a unit in winter and summer, improves economic benefits in factories, provides references for debugging and operation and inspection of the surface indirect air cooling system of domestic chemical or thermal power plants, and has universality.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. The sector antifreezing control method is characterized by comprising the following steps of:
acquiring a low-temperature anti-freezing mode signal of a sector of a surface type indirect cooling system, wherein the low-temperature anti-freezing mode signal is acquired according to the external environment temperature of an indirect cooling tower where the sector is acquired;
determining the working state of the sector, wherein the working state comprises a water filling triggering state and a water discharging triggering state;
determining the anti-freezing protection triggering conditions of the sector, wherein the anti-freezing protection triggering conditions comprise sector valve faults, water filling sequence control failures, drainage sequence control failures and sector water outlet temperature lower than a temperature threshold;
executing a corresponding anti-freezing control strategy on the sector under the working state according to the low-temperature anti-freezing mode signal and the anti-freezing protection triggering condition, wherein the anti-freezing control strategy comprises a sector emptying water strategy and a sector refilling water strategy;
the judging basis of the working state comprises the following steps:
the judgment basis of the water filling triggering state is that a hot water inlet valve is opened, a hot water drain valve is closed, a cold water outlet valve is opened, and a cold water drain valve is closed;
the judgment basis of the drainage triggering state is that the hot water inlet valve is closed, the hot water drainage valve is opened, the cold water outlet valve is closed and the cold water drainage valve is opened;
if the valve of the sector is completely opened, the valve executes open feedback; if the valve is completely closed, the valve performs closing feedback; if the valve is not fully opened or not fully closed, the valve does not perform feedback; sector valves normally include:
the hot water inlet valve performs the open feedback and the cold water outlet valve performs the open feedback;
the hot water inlet valve performs the shut-off feedback and the cold water outlet valve performs the shut-off feedback;
the hot water drain valve performs the open feedback and the cold water drain valve performs the open feedback;
the hot water drain valve performs the off feedback and the cold water drain valve performs the off feedback;
the hot water inlet valve does not perform feedback and the cold water outlet valve does not perform feedback;
the hot water drain valve does not perform feedback and the cold water drain valve does not perform feedback;
the judging basis of the sector valve faults comprises sector valve feedback conditions except for the sector valve normal conditions;
the method for executing the corresponding anti-freezing control strategy on the sector under the working state according to the low-temperature anti-freezing mode signal and the anti-freezing protection triggering condition comprises the following steps:
triggering a low-temperature anti-freezing mode to work by the low-temperature anti-freezing mode signal, and determining the working state of the sector in the low-temperature anti-freezing mode;
if the sector is in the water filling triggering state, continuing to determine the anti-freezing protection triggering condition;
if the anti-freezing protection triggering condition is that the sector valve fails, executing the sector refilling strategy;
if the anti-freezing protection triggering condition is that the water filling sequence control fails, executing the sector refilling strategy;
if the anti-freezing protection triggering condition is that the drainage sequence control fails, executing the sector refilling strategy;
if the anti-freezing protection triggering condition is that the water outlet temperature of the sector is lower than a temperature threshold value, executing the sector water draining strategy;
and executing a corresponding anti-freezing control strategy on the sector under the working state according to the low-temperature anti-freezing mode signal and the anti-freezing protection triggering condition, and further comprising the following steps:
if the sector is in the drainage triggering state, continuing to determine the anti-freezing protection triggering condition;
if the anti-freezing protection triggering condition is that the sector valve fails, executing the sector water draining strategy;
if the anti-freezing protection triggering condition is that the water filling sequence control fails, executing the sector water draining strategy;
and if the anti-freezing protection triggering condition is that the drainage sequence control fails, executing the sector drainage strategy.
2. The sector freeze control method of claim 1, wherein the sector drain strategy comprises closing a hot water inlet valve, opening a hot water drain valve, closing a cold water outlet valve, and opening a cold water drain valve; the sector refill strategy includes opening a hot water inlet valve, closing a hot water drain valve, opening a cold water outlet valve, and closing a cold water drain valve.
3. The sector freeze control method of claim 1, wherein the close shutter strategy is to be performed at the same time as the sector drain water strategy or the sector refill water strategy is to be performed.
4. A surface-type inter-cooling system sector, comprising:
the sector water storage unit is provided with a hot water inlet, a cold water outlet, a hot water outlet and a cold water outlet and is used for placing filled circulating water;
the valve bank comprises a hot water inlet valve, a hot water drain valve, a cold water outlet valve and a cold water drain valve, wherein the hot water inlet valve is connected with the hot water inlet, the hot water drain valve is connected with the hot water drain outlet, the cold water outlet valve is connected with the cold water outlet, and the cold water drain valve is connected with the cold water drain outlet; the hot water inlet valve, the hot water drain valve, the cold water outlet valve, and the cold water drain valve are controlled using the sector antifreeze control method according to any one of claims 1 to 3.
5. A sector antifreeze control system for a surface type indirect cooling system sector, comprising:
the temperature acquisition unit is used for acquiring the external environment temperature data of the indirect cooling tower where the surface type indirect cooling system sector is located;
the signal conversion unit is used for converting the external environment temperature data which accords with the operation triggering the low-temperature anti-freezing mode into a low-temperature anti-freezing mode signal;
the working state acquisition unit is used for acquiring the working state of the surface type indirect cooling system sector, wherein the working state comprises a water filling triggering state and a water discharging triggering state;
the trigger condition acquisition unit is used for acquiring the anti-freezing protection trigger conditions of the surface type inter-cooling system sector, wherein the anti-freezing protection trigger conditions comprise sector valve faults, water filling sequence control failures, drainage sequence control failures and sector water outlet temperature lower than a temperature threshold;
an antifreeze control unit for executing the sector antifreeze control method according to any one of claims 1 to 3.
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| CN202210407384.3A CN114739200B (en) | 2022-04-18 | 2022-04-18 | Sector anti-freezing control method and system and surface type indirect cooling system sector |
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|---|---|---|---|---|
| US20040045600A1 (en) * | 2002-09-09 | 2004-03-11 | Hoggard Javier J. | Water freeze prevention device |
| CN207113650U (en) * | 2017-09-15 | 2018-03-16 | 双良节能系统股份有限公司 | A kind of indirect air cooling system freezing protection control device |
| CN108444309A (en) * | 2018-03-19 | 2018-08-24 | 国电南京电力试验研究有限公司 | A kind of heat storage type defroster for indirect air cooling system |
| CN108733092A (en) * | 2018-05-21 | 2018-11-02 | 内蒙古电力(集团)有限责任公司 | A kind of surface-type indirect air cooling system cycle water controling method |
| CN112050660A (en) * | 2020-08-31 | 2020-12-08 | 华北电力科学研究院有限责任公司 | Time-sharing anti-freezing control method of indirect air cooling tower |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040045600A1 (en) * | 2002-09-09 | 2004-03-11 | Hoggard Javier J. | Water freeze prevention device |
| CN207113650U (en) * | 2017-09-15 | 2018-03-16 | 双良节能系统股份有限公司 | A kind of indirect air cooling system freezing protection control device |
| CN108444309A (en) * | 2018-03-19 | 2018-08-24 | 国电南京电力试验研究有限公司 | A kind of heat storage type defroster for indirect air cooling system |
| CN108733092A (en) * | 2018-05-21 | 2018-11-02 | 内蒙古电力(集团)有限责任公司 | A kind of surface-type indirect air cooling system cycle water controling method |
| CN112050660A (en) * | 2020-08-31 | 2020-12-08 | 华北电力科学研究院有限责任公司 | Time-sharing anti-freezing control method of indirect air cooling tower |
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