CN105698207B - Power station boiler pulverizing system, starting self checking method and device - Google Patents

Abstract

The present invention provides a power plant boiler pulverization system, start-up self-inspection method and device. The power plant boiler pulverization system includes: a coal mill, multiple pulverized pipelines, multiple coal mill outlet quick-closing doors, multiple throttling Resistance adjustment device, multiple wind speed measuring devices, hot primary air adjustment door, cold primary air adjustment door, inlet isolation door, inlet air volume measurement device; multiple powder conveying pipes are respectively connected between the outlet of the coal mill and the inlet of the furnace , along the direction from the coal mill to the furnace, each pulverizer pipeline is installed in turn with a coal mill outlet quick-closing door, a throttling resistance adjustment device, and an air speed measurement device; the coal mill inlet pipeline is connected to the cold primary air pipe and the hot primary air Install the inlet air volume measuring device and the inlet isolation door on the inlet pipe, install the cold primary air adjustment door on the cold primary air pipe, and install the hot primary air adjustment door on the hot primary air pipe. The invention can judge whether the resistance deviation among the powder conveying pipelines satisfies the starting condition.

Description

Power plant boiler pulverizing system, start-up self-inspection method and device

technical field

The invention relates to the power plant boiler technology of the pulverizing system, in particular to a power plant boiler pulverizing system, a start-up self-inspection method and a device.

Background technique

Most of the existing power plant boilers are designed to adopt the positive pressure direct blowing pulverizing system, and different numbers of pulverizing systems are configured according to the capacity of the unit. The number of pulverized coal pulverizer pipes in each pulverizing system varies with the combustion mode of the boiler: four corner tangentially fired boilers are equipped with 4 pulverized pulverized pipes in each pulverized pulverizing system, front and rear The coal pulverizer in each pulverizing system of the wall opposed combustion boiler is usually equipped with 4-6 pulverizing pipelines.

Due to the difference in length and direction of the pipelines at the outlet of a single coal mill, there is a large difference in system resistance. Generally, a cold ventilation test will be carried out during the shutdown of the coal mill for maintenance to confirm that each pulverizer passes through the outlet of the coal mill. Check whether the speed of the air-powder mixture entering the furnace from the powder pipe is uniform, and whether the deviation is within the normal range; if the deviation is too large, the deviation can be eliminated by adjusting the resistance adjustment device (shrinkage cavity). However, during the normal maintenance period of a coal mill, the equipment on the powder delivery pipeline, such as the sliding plate door, shrinkage cavity, burner nozzle, etc., often cause the burner nozzle to coke due to pipeline wear and exit door switch failure (not in place). Blockage, etc., cause the wind speed deviation in each powder delivery pipeline.

The air volume at the inlet of the coal mill is an important parameter in the operation of the boiler. It participates in the automatic adjustment of the coal mill, and the accuracy of its measurement data directly affects the safety and economy of the operation; For calibration and calibration, after installation and operation, a cold calibration test is usually carried out during the overhaul period to check the accuracy of the test after a certain period of work. However, due to the harsh environment and conditions in the working area of the coal mill, the air volume measurement device is prone to failure during operation, resulting in excessive measurement errors, but the operation and maintenance personnel are not easy to detect, which brings great risks to the production management of the power plant.

Before starting the coal mill, it is necessary to check the status of the equipment to determine whether the equipment is normal, and it can only be started after the starting conditions are met. The start-up conditions of the existing coal mill generally include checking the electrical signal and thermal signal of the coal mill, whether the corresponding damper baffle is normal, whether the air temperature, air volume and other parameters meet the set value requirements, etc. Resistance deviation. When the resistance deviation is too large and the pulverized coal concentration has a huge difference, it will cause combustion failures such as uneven heat release of the boiler, deflection of the flame, and brushing of the wall by the airflow, which will affect the safety and economy of the boiler operation.

Contents of the invention

The embodiment of the present invention provides a power station boiler pulverization system, a start-up self-inspection method and a device, so as to automatically detect the resistance deviation of the powder delivery pipeline, judge whether the resistance deviation between the powder delivery pipelines meets the start-up condition, and measure the air volume at the same time. The system conducts start-up inspection and verification, and discovers hidden and undetectable hidden troubles in time.

In order to achieve the above purpose, an embodiment of the present invention provides a pulverizing system for a power plant boiler. The pulverizing system for a power plant boiler includes: a coal mill, multiple pulverized pipelines, multiple coal mill outlet quick-closing doors, multiple joints Flow resistance adjustment device, multiple wind speed measurement devices, hot primary air adjustment door, cold primary air adjustment door, entrance isolation door, inlet air volume measurement device;

A plurality of the pulverized pipelines are respectively connected between the outlet of the coal mill and the entrance of the furnace. Said coal mill outlet fast closing door, throttling resistance adjusting device and wind speed measuring device; said coal mill is respectively connected to cold primary air pipe and hot primary air pipe through inlet pipe, said inlet air volume measuring device is installed on said inlet pipe The device and the entrance isolation door, the cold primary air adjustment door is installed on the cold primary air duct, and the hot primary air adjustment door is installed on the hot primary air duct.

In one embodiment, when the pulverizing system of the power plant boiler is started, the outlet quick-closing door of the coal mill, the inlet isolation door, the hot primary air adjustment door and the cold primary air adjustment door are in an open state; The cold primary air is mixed with the primary air to form the primary air, and the primary air enters the coal mill through the inlet air volume measuring device; the pulverized coal pulverized by the coal mill is transported into the The pulverized coal pipeline passes through the outlet quick-closing door of the coal mill, the throttling resistance adjusting device, and the wind speed measuring device in sequence and enters multiple pulverized coal burners on the same floor as the furnace.

In order to achieve the above purpose, the embodiment of the present invention also provides a start-up self-inspection method of the power plant boiler pulverization system, which is applied to the above-mentioned power plant boiler pulverization system, and the start-up self-inspection method includes:

Receive the startup self-inspection instruction, and open the outlet quick-closing door of the coal mill, the inlet isolation door, the hot primary air adjustment door, and the cold primary air adjustment door according to the startup instruction, with the preset air volume Ventilation preheats the coal mill;

Detecting whether all state parameters of the coal mill meet preset conditions;

If so, place the adjustable vane baffle of the throttling resistance adjusting device at the fully open position;

real-time measurement of the wind speed in each of the powder delivery pipelines, and calculate the air volume in each of the powder delivery pipelines;

According to the sealed air volume, the air volume at the inlet of the coal mill and the air volume in each of the pulverizing pipelines, calculate the air volume verification coefficient for the current start-up of the pulverizing system of the utility boiler;

judging whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient;

If so, measure the wind speed of each powder conveying pipeline in real time, and calculate each angular deviation value of the furnace;

Adjusting the opening of the throttling resistance adjusting device, and comparing the deviation values of each angle with the preset threshold range;

If the angular deviation values are within the preset threshold range, start the utility boiler pulverizing system.

In one embodiment, the detection of whether all the state parameters of the coal mill meet the preset conditions includes: whether there is an electrical signal, whether there is a thermal signal, whether the outlet of the coal mill is closing quickly, throttling resistance Whether the adjustment device, the hot primary air adjustment door, the cold primary air adjustment door and the damper baffle of the entrance isolation door are fully opened, whether there is an alarm signal in the gearbox system, lubricating oil system and flame detection system, and whether the ignition permission signal is received, Whether the primary air volume and air temperature meet the set threshold range, and whether there is a trigger condition for coal mill tripping.

In one embodiment, the real-time measurement of the wind speed in each of the powder delivery pipelines, and calculation of the air volume in each of the powder delivery pipelines includes:

Using the wind speed measuring device to measure the wind speed in each of the powder conveying pipelines in real time;

Calculate the air volume in each powder delivery pipeline according to the following formula:

Among them, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline.

In one embodiment, the calculation of the air volume verification coefficient for the power station boiler pulverizing system starting this time is based on the sealed air volume, the air volume at the coal mill inlet, and the air volume in each of the pulverization pipelines, including:

Calculate the total primary air volume in each of the powder conveying pipelines;

According to the following formula, calculate the air volume verification coefficient of the pulverizing system of the power plant boiler this time:

Wherein, the inlet air volume of the coal mill is measured by the inlet air volume measuring device.

In an embodiment, the judging whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient includes:

Establish a database of historical air volume calibration coefficients;

Comparing the air volume calibration coefficient with the average value of the historical air volume calibration coefficients in the database to generate a deviation value;

Judging whether the deviation value is within a predetermined range, if yes, the working state of the inlet air volume measuring device satisfies a predetermined condition.

In order to achieve the above purpose, the embodiment of the present invention also provides a starting self-checking device of a power plant boiler pulverizing system, which is suitable for the above-mentioned power plant boiler pulverizing method, and the starting self-checking device includes:

The pre-heating unit is used to receive the start-up self-inspection instruction, and open the coal mill outlet quick-closing door, the inlet isolation door, the hot primary air adjustment door and the cold primary air adjustment door according to the start-up instruction, Preheating the coal mill with ventilation at a preset air volume;

A parameter detection unit, configured to detect whether all state parameters of the coal mill meet preset conditions;

An opening adjustment unit, used to place the adjustable vane baffle of the throttling resistance adjustment device at a fully open position;

The air volume calculation unit is used to measure the wind speed in each powder delivery pipeline in real time, and calculate the air volume in each powder delivery pipeline;

The calibration coefficient calculation unit is used to calculate the air volume calibration coefficient of the power plant boiler pulverizing system starting this time according to the air volume of the seal, the air volume of the coal mill inlet, and the air volume in each of the pulverization pipelines;

A state judging unit, configured to judge whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient;

Angle deviation calculation unit, used to measure the wind speed of each powder conveying pipeline in real time, and calculate each angle deviation value of the furnace;

a comparison unit, adjusting the opening degree of the throttling resistance adjustment device in the opening adjustment unit, and comparing the deviation values of each angle with the preset threshold range;

The starting unit is used to start the pulverizing system of the utility boiler.

In one embodiment, the preset conditions that the state parameters meet include: whether there is an electrical signal, whether there is a thermal signal, the coal mill outlet fast closing door, throttling resistance adjustment device, hot primary air adjustment door, cold Whether the primary air adjustment door and the damper baffle of the entrance isolation door are fully opened, whether there is an alarm signal in the gearbox system, lubricating oil system and flame detection system, whether a signal to allow ignition is received, whether the primary air volume and air temperature meet the set requirements. Determine the threshold range, and whether there is a condition that triggers the tripping of the coal mill.

In one embodiment, the air volume calculation unit is specifically used for:

Using the wind speed measuring device to measure the wind speed in each of the powder conveying pipelines in real time;

Calculate the air volume in each powder delivery pipeline according to the following formula:

Among them, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline.

In an embodiment, the verification coefficient calculation unit is specifically used for:

Calculate the total primary air volume in each of the powder conveying pipelines;

According to the following formula, calculate the air volume verification coefficient of the pulverizing system of the power plant boiler this time:

Wherein, the inlet air volume of the coal mill is measured by the inlet air volume measuring device.

In one embodiment, the state judgment unit includes:

The database creation module is used to establish a database of historical air volume calibration coefficients;

A deviation value generating module, configured to compare the air volume calibration coefficient with the average value of the historical air volume calibration coefficients in the database to generate a deviation value;

A judging module, configured to judge whether the deviation value is within a predetermined range, and if yes, the working state of the inlet air volume measuring device satisfies a predetermined condition.

The beneficial effect of the embodiment of the present invention is that the present invention is used in the start-up process of the pulverizing system, can detect and automatically adjust the resistance deviation of the pulverizing pipeline, and judge whether the resistance deviation between the pulverizing pipelines meets the operation requirements of the pulverizing system ; The test data accumulated during each start-up and the establishment of a start-up database can help the operation and maintenance personnel to understand the pulverization system in time, especially for the working status of the pulverized pipeline that is not easy to detect under the existing conditions, and to judge whether there is pulverized coal blockage, etc. Fault; at the same time, start-up inspection and verification of the air volume measurement system, compared with historical data, can help operation and maintenance personnel to judge the accuracy of air volume data measurement, timely discover hidden and undetectable hidden troubles, and prompt maintenance personnel to check and confirm And repair it early, so as to improve the working safety of the pulverizing system and the accuracy of operation control, and ensure the normal combustion of the boiler.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural view of a power plant boiler pulverizing system according to an embodiment of the present invention;

2 is a schematic structural diagram of a data processing and computing device according to an embodiment of the present invention;

Fig. 3 is the flow chart of the start-up self-inspection method of the pulverizing system of the utility boiler according to the embodiment of the present invention;

4 is a flow chart of the working state of the inlet air volume measuring device according to the embodiment of the present invention;

Fig. 5 is a structural block diagram of the start-up self-checking device of the power plant boiler pulverizing system according to the embodiment of the present invention;

FIG. 6 is a structural block diagram of the state judging unit 506 according to the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, an embodiment of the present invention provides a pulverizing system for a power plant boiler, which includes: a coal mill, multiple pulverized pipelines 8, and multiple coal mill outlet quick-closing doors 1 , Multiple throttling resistance adjusting devices 2, multiple wind speed measuring devices 3, hot primary air adjusting door 4, cold primary air adjusting door 5, entrance isolation door 6, and inlet air volume measuring device 7.

A plurality of powder conveying pipelines 8 are respectively arranged between the outlet of the coal mill and the inlet of the furnace 9 . Along the direction from the coal mill to the furnace, each powder conveying pipeline 8 is sequentially installed with a quick closing door 1 at the outlet of the coal mill, a throttling resistance adjusting device 2 and a wind speed measuring device 3 .

The inlet pipe 10 of the coal mill is respectively connected to the cold primary air pipe 11 and the hot primary air pipe 12. The inlet air volume measuring device 7 and the entrance isolation door 6 are installed on the inlet pipe 10. The inlet air volume measurement device 7 is close to the coal mill and the inlet isolation door 6 Stay away from coal mills. The cold primary air adjustment door 5 is installed on the cold primary air duct 11, and the hot primary air adjustment door 4 is installed on the hot primary air duct 12.

The pulverization system of the power plant boiler mentioned above is only an example of a pulverization system prepared by a four-corner tangentially fired boiler, and is not intended to be limited.

When the pulverizing system of the power plant boiler is started, the exit quick-closing door 1 of the coal mill, the inlet isolation door 6, the hot primary air adjustment door 4 and the cold primary air adjustment door 5 are in the open state. After the cold primary air passes through the cold primary air adjusting door 5, it mixes with the hot primary air passing through the hot primary air adjusting door 4 to become the primary air. The primary air enters the coal mill through the inlet isolation door 6 and the inlet air volume measuring device 7 in turn, and then enters the powder conveying pipeline 8 . The pulverized coal pulverized by the coal mill is conveyed into the powder conveying pipeline 8 after being mixed by the primary air, and then conveyed into the furnace 9 through the quick closing door 1 at the outlet of the coal mill, the throttling resistance adjustment device 2 and the wind speed measuring device 3 in turn. A plurality of pulverized coal burners of the layer (such as 1# corner, 2# corner, 3# corner and 4# corner totally four pulverized coal burners) 13 among Fig. 1.

When the pulverizing system of the power station boiler is in normal ventilation operation, according to the flow direction of the mixed primary air flow, it passes through the following devices or equipment in sequence: coal mill → enters the powder conveying pipe → quickly closes the exit door → adjustable resistance adjustment device → wind speed measurement device → corresponding to the burner.

The utility boiler pulverizing system of the present invention can be used for start-up detection. In order to start detection of the power plant boiler pulverizing system of the present invention, as shown in Figure 2, the present invention provides a data processing and computing device, the data processing and computing device is connected to each component in the power plant boiler pulverizing system, which can Collect coal mill inlet parameter information and coal mill outlet parameter information. The coal mill inlet parameter information includes: coal mill electrical signal and thermal signal, ignition energy, fire detection system signal, hot air parameters entering the mill, coal mill state parameters, etc. The coal mill outlet parameter information includes: shrinkage cavity opening , outlet door status, outlet air temperature and outlet air volume, etc. The coal mill inlet parameter information and the coal mill outlet parameter information can be stored in the data memory. Fig. 2 only shows part of the coal mill inlet parameter information and the coal mill outlet parameter information, which is not intended to limit the present invention.

The data processing and computing device in Figure 2 works independently of the thermal DCS control system of the unit. It is easy to put in or out, and will not interfere with the operation of the DCS control system of the unit, nor will it increase the operating burden of the control system. Next, we will introduce how to control it in detail. The power plant boiler pulverizing system of the present invention performs self-inspection at start-up.

Before the power plant boiler pulverizing system starts self-inspection, the data processing and computing device sends it a start self-inspection instruction. Close the door, open the entrance isolation door, open the hot air adjustment door and the cold air adjustment door, maintain the preset air volume for stable ventilation, and carry out the ventilation and preheating work of the coal mill.

During this period, the normal state parameters of the coal mill are checked to detect whether all the state parameters of the coal mill meet the preset conditions. The start-up inspection mainly includes: whether there is an electrical signal, whether there is a thermal signal, Whether the outlet quick-closing door of the coal mill, throttling resistance adjustment device, hot primary air adjustment door, cold primary air adjustment door, and damper baffles of the entrance isolation door are fully open, whether the reduction box system, lubricating oil system, and flame detection system are fully open. Whether there is an alarm signal, whether the signal to allow ignition is received, whether the primary air volume and air temperature meet the set threshold range, and whether there is a condition that triggers the tripping of the coal mill. If the state parameters in the above start-up inspection do not meet the preset conditions, it is forbidden to start the pulverizing system of the power plant boiler, and a corresponding alarm is issued.

If the state parameters all meet the preset conditions, the data processing and calculating device controls to place the multiple throttling resistance adjusting devices at the fully open position.

The data processing and calculation device controls multiple wind speed measuring devices 3 installed on the pulverized coal pulverizer pipeline to measure the wind speed in each pulverized pipeline in real time, and calculate the air volume in each pulverized pipeline. The formula is as follows:

In the above formula 1, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline.

The data processing and calculation device deducts the sealed air volume according to the air volume calculation program, and calculates the total primary air volume in all pulverized pipelines at the outlet of the coal mill; Comparing the total air volume, calculate the air volume calibration coefficient for this start-up cold working condition, the formula is as follows:

Utilize the air volume calibration coefficient obtained above, can establish the database of the calibration coefficient of each start-up process, use the historically accumulated data to compile a program to judge the working state of the inlet air volume measuring device 7, such as wear and tear, blockage, etc. that affect the accuracy of the measurement Happening. Specifically, calculate the difference between the above-mentioned air volume verification coefficient and the average verification coefficient in the database, compare the difference with the difference between the average verification coefficient in the database, and if the ratio is within a predetermined threshold interval, then The working state of the air volume measuring device satisfies the predetermined condition, and the step of automatically adjusting the resistance of the powder conveying pipeline can be performed. If the ratio exceeds a predetermined threshold interval, an alarm is issued and the coal mill is prohibited from starting. In an embodiment, the threshold range may be (-5%, 5%). The present invention is not limited thereto.

In the step of automatically adjusting the resistance of the powder conveying pipeline, at first, according to the wind speed in each powder conveying pipeline measured in real time by a plurality of wind speed measuring devices 3 on the powder conveying pipeline, calculate the deviation value of each angle (that is, calculate the 1# angle in Fig. 1 , 2# angle, 3# angle and 4# angle deviation value).

In one embodiment, each angular deviation value is the deviation value of the wind speed, and the calculation formula is as follows:

The average wind speed is the average value of the wind speeds of the powder conveying pipelines at each corner (corner 1#, corner 2#, corner 3# and corner 4#).

In another embodiment, each angle deviation value can also be a resistance deviation value, and the calculation method is as follows:

The average wind speed is the average value of the resistance of the powder conveying pipeline at each corner (corner 1#, corner 2#, corner 3# and corner 4#).

Afterwards, it is judged whether each angle deviation value is within the preset threshold range, if each angle deviation value is not within the preset threshold value range, adjust the opening degree of the throttling resistance adjusting device 2, and calculate each angle deviation value at the same time, and compare each angle deviation value value and the preset threshold range, if the deviation values of each angle are within the preset threshold range, it means that the resistance and wind speed of each corner are uniform, and the data processing and calculation device issues a start-up command, and the start-up self-test procedure ends.

In one embodiment, the preset threshold range is (-5%, 5%), and the present invention is not limited thereto.

If after a certain number of wind speed tests and automatic adjustments of the resistance adjustment device, the wind speed or resistance deviation cannot be eliminated, the coal mill is prohibited from starting and an alarm is issued.

The invention is used in the start-up process of the pulverization system, which can detect and automatically adjust the resistance deviation of the pulverization pipeline, and judge whether the resistance deviation between the pulverization pipelines meets the operation requirements of the pulverization system; the test data accumulated in each startup , establish a start-up database, which can help the operation and maintenance personnel to understand the pulverization system in time, especially for the working status of the pulverized pipeline that is not easy to detect under the existing conditions, and judge whether there are faults such as pulverized coal blockage; at the same time, start the air volume measurement system Inspection and calibration, compared with historical data, can help operation and maintenance personnel judge the accuracy of air volume data measurement, timely discover hidden and undetectable hidden troubles, prompt maintenance personnel to check and confirm and repair them early, and then improve the pulverizing system The safety of work and the accuracy of operation control ensure the normal combustion of the boiler.

As shown in Figure 3, the embodiment of the present invention provides a start-up self-inspection method of a power plant boiler pulverizing system, which is applied to the power plant boiler pulverization system shown in Figure 1, and is characterized in that the start-up self-inspection method includes:

S301: Receive the startup self-inspection instruction, and open the coal mill outlet quick-closing door, the inlet isolation door, the hot primary air adjustment door, and the cold primary air adjustment door according to the startup instruction to preset The air volume ventilation is used to preheat the coal mill.

S302: Detect whether all the state parameters of the coal mill meet the preset conditions, if yes, go to S303; if not, prohibit starting, alarm and prompt maintenance.

S303: Put the adjustable vane baffle of the throttling resistance adjusting device at a fully open position.

S304: Measure the wind speed in each powder conveying pipeline in real time, and calculate the air volume in each powder conveying pipeline.

S305: Calculate an air volume verification coefficient for the power plant boiler pulverizing system starting this time according to the air volume of the sealing air, the air volume at the coal mill inlet, and the air volume in each of the pulverization pipelines.

S306: Determine whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient.

S307: If yes, measure the wind speed of each powder conveying pipeline in real time, and calculate the angular deviation value of the furnace;

S308: Adjust the opening degree of the throttling resistance adjusting device.

S309: Comparing the values of each angular deviation with a preset threshold range.

S310: If the angular deviation values are within the preset threshold range, start the pulverizing system of the utility boiler.

In S302, it is detected whether all state parameters of the coal mill meet the preset conditions, including: whether there is an electrical signal, whether there is a thermal signal, the coal mill outlet fast closing door, throttling resistance adjustment device, hot primary air adjustment Whether the door, cold primary air adjustment door and the air door baffle of the entrance isolation door are fully opened, whether there is an alarm signal in the gearbox system, lubricating oil system and fire detection system, whether a signal to allow ignition is received, the primary air volume and air temperature Whether it meets the set threshold range, whether there is a trigger condition for coal mill tripping, etc. If the above conditions are all met, go to S303. If there are any unsatisfied conditions in the above conditions, the start is prohibited, and the alarm prompts for maintenance.

In one embodiment, S304 includes the following steps:

Using the wind speed measuring device to measure the wind speed in each of the powder conveying pipelines in real time;

Calculate the air volume in each powder delivery pipeline according to the following formula:

Among them, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline.

In one embodiment, S305 includes:

Calculate the total primary air volume in each of the powder conveying pipelines;

According to the following formula, calculate the air volume verification coefficient of the pulverizing system of the power plant boiler this time:

Wherein, the inlet air volume of the coal mill is measured by the inlet air volume measuring device.

As shown in Figure 4, in an embodiment, S306 includes:

S401: Establish a database of historical air volume calibration coefficients;

S402: Comparing the air volume calibration coefficient with the average value of historical air volume calibration coefficients in the database to generate a deviation value;

S403: Determine whether the deviation value is within a predetermined range, and if yes, the working state of the inlet air volume measuring device meets a predetermined condition.

In an embodiment, the specific implementation of S307 to S310 includes:

First, according to the wind speed in each powder delivery pipeline measured in real time by a plurality of wind speed measuring devices 3 on the powder delivery pipeline, calculate the deviation value of each angle (that is, calculate the 1# angle, the 2# angle, the 3# angle and the 4# angle in Fig. 1 #The deviation value of the angle).

In one embodiment, each angular deviation value is the deviation value of the wind speed, and the calculation formula is as follows:

The average wind speed is the average value of the wind speeds of the powder conveying pipelines at each corner (corner 1#, corner 2#, corner 3# and corner 4#).

In another embodiment, each angle deviation value can also be a resistance deviation value, and the calculation method is as follows:

The average wind speed is the average value of the resistance of the powder conveying pipeline at each corner (corner 1#, corner 2#, corner 3# and corner 4#).

Afterwards, it is judged whether each angle deviation value is within the preset threshold range, if each angle deviation value is not within the preset threshold value range, adjust the opening degree of the throttling resistance adjusting device 2, and calculate each angle deviation value at the same time, and compare each angle deviation value value and the preset threshold range, if the deviation values of each angle are within the preset threshold range, it means that the resistance and wind speed of each corner are uniform, and the data processing and calculation device issues a start-up command, and the start-up self-test procedure ends.

In one embodiment, the preset threshold range is (-5%, 5%), and the present invention is not limited thereto.

If after a certain number of wind speed tests and automatic adjustments of the resistance adjustment device, the wind speed or resistance deviation cannot be eliminated, the coal mill is prohibited from starting and an alarm is issued.

As shown in Figure 5, the embodiment of the present invention provides a startup self-checking device for a power plant boiler pulverization system, which is suitable for the power plant boiler pulverization method shown in Figure 2 and Figure 1, and the startup self-checking device includes : Preheating unit 501, parameter detection unit 502, opening adjustment unit 503, air volume calculation unit 504, calibration coefficient calculation unit 505, state judgment unit 506, angle deviation value calculation unit 507, comparison unit 508 and start unit 509. In one embodiment, the boot self-test device has the same function as the data processing and computing device shown in FIG. 2 .

The pre-heating unit 501 is used to receive the startup self-inspection instruction, and open the coal mill outlet quick-closing door, the inlet isolation door, the hot primary air adjustment door and the cold primary air adjustment door according to the startup instruction, The coal mill is preheated by ventilating at a preset air volume.

The parameter detection unit 502 is used to detect whether all state parameters of the coal mill meet preset conditions.

The opening adjustment unit 503 is used to place the adjustable vane baffle of the throttling resistance adjusting device at a fully open position.

The air volume calculation unit 504 is used to measure the wind speed in each powder conveying pipeline in real time, and calculate the air volume in each powder conveying pipeline.

The verification coefficient calculation unit 505 is used to calculate the air volume verification coefficient for the start-up of the pulverizing system of the power plant boiler according to the sealing air volume, the air volume at the coal mill inlet and the air volume in each pulverization pipeline.

The state judging unit 506 is used for judging whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient.

The angular deviation calculation unit 507 is used to measure the wind speed of each powder conveying pipeline in real time, and calculate each angular deviation of the furnace.

The comparison unit 508 adjusts the opening degree of the throttling resistance adjustment device in the opening degree adjustment unit, and compares each angular deviation value with a preset threshold range at the same time.

The starting unit 509 is used to start the pulverizing system of the utility boiler.

In one embodiment, the preset conditions that the state parameters meet include: whether there is an electrical signal, whether there is a thermal signal, the coal mill outlet fast closing door, throttling resistance adjustment device, hot primary air adjustment door, cold Whether the primary air adjustment door and the damper baffle of the entrance isolation door are fully opened, whether there is an alarm signal in the gearbox system, lubricating oil system and flame detection system, whether a signal to allow ignition is received, whether the primary air volume and air temperature meet the set requirements. Determine the threshold range, and whether there is a condition that triggers the tripping of the coal mill.

In an embodiment, the air volume calculation unit 504 is specifically used for:

Using the wind speed measuring device to measure the wind speed in each of the powder conveying pipelines in real time;

Calculate the air volume in each powder delivery pipeline according to the following formula:

Among them, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline.

In an embodiment, the check coefficient calculation unit 505 is specifically used for:

Calculate the total primary air volume in each of the powder conveying pipelines;

According to the following formula, calculate the air volume verification coefficient of the pulverizing system of the power plant boiler this time:

Wherein, the inlet air volume of the coal mill is measured by the inlet air volume measuring device.

As shown in FIG. 6 , in an embodiment, the state judgment unit 506 includes: a database creation module 601 , a deviation value generation module 602 and a judgment module 603 .

The database creation module 601 is used to establish the database of historical air volume calibration coefficients;

The deviation value generating module 602 is used to compare the air volume calibration coefficient with the average value of the historical air volume calibration coefficients in the database to generate a deviation value;

The judging module 603 is used to judge whether the deviation value is within a predetermined range, and if so, the working state of the inlet air volume measuring device satisfies a predetermined condition.

The present invention measures the wind speed of each powder conveying pipeline in real time through the angular deviation calculation unit 507, calculates the angular deviation values of the furnace, and adjusts the opening of the throttling resistance adjustment device through the comparison unit 508 in the opening adjustment unit. degrees, and at the same time compare the size of each angle deviation value with the preset threshold range. For specific implementation of the angular deviation value calculation unit 507 and the comparison unit 508, please refer to the specific implementation manners described in S307 to S310 above, and details are not repeated here.

The invention is used in the start-up process of the pulverization system, which can detect and automatically adjust the resistance deviation of the pulverization pipeline, and judge whether the resistance deviation between the pulverization pipelines meets the operation requirements of the pulverization system; the test data accumulated in each startup , establish a start-up database, which can help the operation and maintenance personnel to understand the pulverization system in time, especially for the working status of the pulverized pipeline that is not easy to detect under the existing conditions, and judge whether there are faults such as pulverized coal blockage; at the same time, start the air volume measurement system Inspection and calibration, compared with historical data, can help operation and maintenance personnel judge the accuracy of air volume data measurement, timely discover hidden and undetectable hidden troubles, prompt maintenance personnel to check and confirm and repair them early, and then improve the pulverizing system The safety of work and the accuracy of operation control ensure the normal combustion of the boiler.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In the present invention, specific examples have been applied to explain the principles and implementation methods of the present invention, and the descriptions of the above examples are only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to this The idea of the invention will have changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A startup self-inspection method for a power plant boiler pulverizing system, which is applied to a power plant boiler pulverizing system. The power plant boiler pulverizing system includes: a coal mill, multiple pulverized pipelines, and multiple coal pulverizer outlets Quick closing door, multiple throttling resistance adjustment devices, multiple wind speed measuring devices, hot primary air adjustment door, cold primary air adjustment door, entrance isolation door, entrance air volume measurement device; A plurality of said powder conveying pipelines are respectively connected between the outlet of said coal mill and the inlet of the furnace, and along the direction from said coal mill to said furnace, each said powder conveying pipeline is sequentially installed with said mill Coal machine outlet fast closing door, throttling resistance adjusting device and wind speed measuring device; the coal mill is respectively connected to the cold primary air pipe and the hot primary air pipe through the inlet pipe, and the inlet air volume measuring device and the air flow measuring device are installed on the inlet pipe The entrance isolating door, the cold primary air adjustment door is installed on the cold primary air pipeline, and the hot primary air adjustment door is installed on the hot primary air pipeline; it is characterized in that the startup self-checking method includes : Receive the startup self-inspection instruction, and open the outlet quick-closing door of the coal mill, the inlet isolation door, the hot primary air adjustment door, and the cold primary air adjustment door according to the startup self-inspection instruction to preset The air volume ventilation of the air volume preheats the coal mill; Detecting whether all state parameters of the coal mill meet preset conditions; If so, place the adjustable vane baffle of the throttling resistance adjusting device at the fully open position; real-time measurement of the wind speed in each of the powder delivery pipelines, and calculate the air volume in each of the powder delivery pipelines; According to the sealed air volume, the air volume at the inlet of the coal mill and the air volume in each of the pulverizing pipelines, calculate the air volume verification coefficient for the current start-up of the pulverizing system of the utility boiler; judging whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient; If so, measure the wind speed of each powder conveying pipeline in real time, and calculate each angular deviation value of the furnace; Adjusting the opening of the throttling resistance adjusting device, and comparing the deviation values of each angle with the preset threshold range; If the angular deviation values are within the preset threshold range, start the utility boiler pulverizing system. 2. The start-up self-inspection method according to claim 1, characterized in that the detection of whether all the state parameters of the coal mill meet the preset conditions includes: whether there is an electrical signal, whether there is a thermal signal, Whether the outlet quick-closing door of the coal mill, throttling resistance adjustment device, hot primary air adjustment door, cold primary air adjustment door, and damper baffles of the entrance isolation door are fully open, whether the reduction box system, lubricating oil system, and flame detection system are fully open. Whether there is an alarm signal, whether the signal to allow ignition is received, whether the primary air volume and air temperature meet the set threshold range, and whether there is a condition that triggers the tripping of the coal mill. 3. The start-up self-test method according to claim 1, wherein the real-time measurement of the wind speed in each of the powder delivery pipelines, and calculating the air volume in each of the powder delivery pipelines includes: Using the wind speed measuring device to measure the wind speed in each of the powder conveying pipelines in real time; Calculate the air volume in each powder delivery pipeline according to the following formula: Among them, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline. 4. The start-up self-test method according to claim 3, characterized in that, according to the sealed air volume, the air volume at the inlet of the coal mill and the air volume in each of the pulverized pipelines, the power station boiler pulverizing system is calculated for this time. Started air volume calibration coefficients, including: Calculate the total primary air volume in each of the powder conveying pipelines; According to the following formula, calculate the air volume verification coefficient of the pulverizing system of the power plant boiler this time: Wherein, the inlet air volume of the coal mill is measured by the inlet air volume measuring device. 5. The start-up self-test method according to claim 1, wherein the judging whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient comprises: Establish a database of historical air volume calibration coefficients; Comparing the air volume calibration coefficient with the average value of the historical air volume calibration coefficients in the database to generate a deviation value; Judging whether the deviation value is within a predetermined range, if yes, the working state of the inlet air volume measuring device satisfies a predetermined condition. 6. A start-up self-checking device of a power plant boiler pulverizing system, suitable for the start-up self-checking method of the power plant boiler pulverizing system according to any one of claims 1-5, characterized in that the start-up self-checking Devices include: The pre-heating unit is used to receive the startup self-inspection instruction, and open the outlet quick-closing door of the coal mill, the inlet isolation door, the hot primary air adjustment door and the cold primary air adjustment according to the startup self-inspection instruction. The door is used to preheat the pulverizer with a pre-set air volume ventilation; A parameter detection unit, configured to detect whether all state parameters of the coal mill meet preset conditions; An opening adjustment unit, used to place the adjustable vane baffle of the throttling resistance adjustment device at a fully open position; The air volume calculation unit is used to measure the wind speed in each powder delivery pipeline in real time, and calculate the air volume in each powder delivery pipeline; The calibration coefficient calculation unit is used to calculate the air volume calibration coefficient of the power plant boiler pulverizing system starting this time according to the air volume of the seal, the air volume of the coal mill inlet, and the air volume in each of the pulverization pipelines; A state judging unit, configured to judge whether the working state of the inlet air volume measuring device satisfies a predetermined condition according to the air volume verification coefficient; Angle deviation calculation unit, used to measure the wind speed of each powder conveying pipeline in real time, and calculate each angle deviation value of the furnace; a comparison unit, adjusting the opening degree of the throttling resistance adjustment device in the opening adjustment unit, and comparing the deviation values of each angle with the preset threshold range; The starting unit is used to start the pulverizing system of the utility boiler. 7. The start-up self-inspection device according to claim 6, characterized in that, the preset conditions satisfied by the state parameters include: whether there is an electrical signal, whether there is a thermal signal, the exit of the coal mill is closed quickly, the throttle Whether the flow resistance adjustment device, the hot primary air adjustment door, the cold primary air adjustment door and the damper baffle of the entrance isolation door are fully open, whether there are alarm signals in the gearbox system, lubricating oil system and flame detection system, and whether the ignition permission is received Signal, whether the primary air volume and air temperature meet the set threshold range, and whether there is a condition that triggers the trip of the coal mill. 8. The start-up self-checking device according to claim 6, wherein the air volume calculation unit is specifically used for: Using the wind speed measuring device to measure the wind speed in each of the powder conveying pipelines in real time; Calculate the air volume in each powder delivery pipeline according to the following formula: Among them, ρ-density; ΔP-differential pressure; ν--wind speed; A--inner diameter of pulverized coal pipeline. 9. The start-up self-checking device according to claim 8, wherein the verification coefficient calculation unit is specifically used for: Calculate the total primary air volume in each of the powder conveying pipelines; According to the following formula, calculate the air volume verification coefficient of the pulverizing system of the power plant boiler this time: Wherein, the inlet air volume of the coal mill is measured by the inlet air volume measuring device. 10. The startup self-checking device according to claim 6, wherein the state judging unit comprises: The database creation module is used to establish a database of historical air volume calibration coefficients; A deviation value generating module, configured to compare the air volume calibration coefficient with the average value of the historical air volume calibration coefficients in the database to generate a deviation value; A judging module, configured to judge whether the deviation value is within a predetermined range, and if yes, the working state of the inlet air volume measuring device satisfies a predetermined condition.