CN112797225A - A device and method for predicting leakage of ultra-low temperature valve online through temperature difference - Google Patents
A device and method for predicting leakage of ultra-low temperature valve online through temperature difference Download PDFInfo
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- CN112797225A CN112797225A CN202110143131.5A CN202110143131A CN112797225A CN 112797225 A CN112797225 A CN 112797225A CN 202110143131 A CN202110143131 A CN 202110143131A CN 112797225 A CN112797225 A CN 112797225A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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Abstract
本发明提供一种通过温差在线预判超低温阀门泄露的装置及方法，包括：表头，所述表头用于显示温度、5G传输和防爆；测温部件，所述测温部件通过连接端口连接于所述表头的一侧；装配部件，所述装配部件通过基座连接于所述测温部件远离所述表头的一侧，用于连接阀盖的外壁。本发明的有益效果是通过检测、分析数据后，能够判断出阀门泄露的可能性，提前做好维修准备；解决了超低温阀门“何时修”的问题；一定程度上避免了泄露后的应急抢修，减少环境污染和安全隐患；通过测温装置的特定设计；结合物联网技术接收温度数据后，对数据的处理的计算；根据数据处理结果，结合超低温阀门的结构特点，提前预判了阀门泄露的可能性。
The invention provides a device and method for predicting the leakage of an ultra-low temperature valve online through a temperature difference, including: a meter, the meter is used for displaying temperature, 5G transmission and explosion-proof; a temperature measuring component, the temperature measuring component is connected through a connection port On one side of the watch head; an assembly part, the assembly part is connected to the side of the temperature measuring part away from the watch head through the base, and is used for connecting to the outer wall of the valve cover. The beneficial effect of the invention is that after detecting and analyzing data, the possibility of valve leakage can be judged, and maintenance preparations are made in advance; the problem of "when to repair" ultra-low temperature valves is solved; emergency repair after leakage is avoided to a certain extent , reduce environmental pollution and potential safety hazards; through the specific design of the temperature measurement device; after receiving the temperature data in combination with the Internet of Things technology, the calculation of the processing of the data; according to the data processing results, combined with the structural characteristics of the ultra-low temperature valve, the valve leakage is predicted in advance possibility.
Description
Technical Field
The invention belongs to the technical field of leakage monitoring application of pipeline general element valves, and particularly relates to a device and a method for online pre-judging leakage of an ultralow-temperature valve through temperature difference.
Background
The valve leakage problem is solved, the production efficiency of a factory is improved, the operation is stable and safe, and the valve leakage problem is a matter which cannot be ignored by factory personnel in the daily equipment maintenance and transportation process. Therefore, a scientific and reasonable daily maintenance manual is compiled by combining process operation parameters, valve structure characteristics, valve manufacturer suggestions and production accumulated experiences in a traditional factory in the petroleum and petrochemical industry, and the problem of valve leakage is conveniently monitored and detected.
With the needs of pulling and technical development in the fields of new energy and new materials, China pays attention to independent development and innovation while introducing foreign mature process technologies, and jointly forms a batch of new process and new devices with technical advancement and scale constructability, such as LNG receiving stations, coal chemical industry, carbon gathering devices and the like. Therefore, the valve is one of the universal pipeline elements, and facing to the new technical field of new technology, manufacturers correspondingly explore and adjust from the aspects of design, material selection and manufacture and subsequent operation and maintenance according to relevant international and domestic standards, so that the valve is suitable for new and harsher application environments.
Valves used in LNG receiving stations, commonly referred to as ultra-low temperature valves, are required to meet international standards such as BS 6364. LNG, a Liquefied Natural Gas (LNG) which is a liquid hydrocarbon mixture mainly containing methane, has a boiling point at-162 ℃ under normal pressure and a Gas-liquid ratio of 625:1, and has a density lower than that of air and is easily diffused in the air to form an explosive mixture when the LNG is exposed to the air. And natural gas methane is five-toxic, tasteless and colorless, and is not easy to be detected when being leaked into the air. The LNG is rapidly vaporized after leakage, and water vapor in the surrounding atmosphere is condensed into a "cloud" to suffocate people, and the cloud of LNG vapor is further mixed with air to form the explosive mixture. In general, the joints of flanges, valves, etc. and the packing of piping elements are places where leakage of LNG is likely to occur.
The valves of the domestic LNG receiving station are mainly connected to the pipeline in a welding mode, the possibility of leakage caused by flange connection is reduced, the welding connection brings inconvenience to the work of detecting the valve leakage on line, and although valve products for online detection and maintenance are provided by current mainstream valve manufacturers, the valve products are difficult to implement based on field conditions. Meanwhile, the leakage of the valve itself, including internal leakage and external leakage, requires daily monitoring, detection, maintenance and repair work. Especially, the valve leaks outwards, if the valve cover sealing ring leaks, the filler at the top of the valve rod leaks, and a leakage detection means is needed, so that leakage can be found in time. If the device and the method for pre-judging the leakage occurrence in advance are available, the device and the method have greater practical significance and long-term value for users. Because the valve on the LNG pipeline is welded connection, it is inconvenient to be given the maintenance of off line in the period. Once a leak occurs, it is often necessary to make a rush repair, which, in addition to causing loss, also presents a safety hazard. Therefore, the valve is judged in advance to judge whether leakage risks exist or not, and great practical significance and use value are achieved.
Disclosure of Invention
The invention aims to provide a device and a method for online pre-judging leakage of an ultralow-temperature valve through temperature difference, which are particularly suitable for online pre-judging leakage of the ultralow-temperature valve on an LNG pipeline and can be used for ball valves, butterfly valves, regulating valves, gate valves and stop valves under ultralow-temperature working conditions.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a device that ultralow temperature valve revealed is prejudged on line through the difference in temperature, includes:
the gauge head is used for displaying temperature, 5G transmission and explosion prevention;
the temperature measuring component is connected to one side of the gauge outfit through a connecting port;
the assembly component is connected to one side, far away from the gauge outfit, of the temperature measurement component through the base and is used for being connected with the outer wall of the valve cover.
Furthermore, the gauge outfit is connected with the connecting port through threads, and power supply equipment is arranged in the gauge outfit.
Further, the temperature measuring part includes: the temperature probe is connected to the lower end face of the connecting port; one end of the protective sleeve is connected with the temperature probe at the same side of the connecting port, the other end of the protective sleeve is connected with the upper end face of the base, and the protective sleeve is sleeved outside the temperature probe and used for accurate temperature measurement.
Further, the length of the temperature probe is smaller than the distance from the lower end face of the connecting port to the upper end face of the base.
Further, the fitting part includes: installation clamp, spring and fastener, the installation clamp sets up in pairs, and is a pair of the both ends of installation clamp are passed through the fastener is connected, the installation clamp with the head junction of fastener is provided with the spring.
Further, the both ends of installation clamp all are provided with outer edge, be provided with on the outer edge with the hole that the fastener is connected.
Further, the spring is a disc spring, and the spring is sleeved on the outer wall of the fastener and used for preventing the installation clamp from loosening.
Furthermore, the assembly part is sleeved on the outer wall of the valve cover through the installation clamp, and the installation clamp and the valve cover are made of the same material.
In order to achieve the purpose, the invention also provides a device and a method for online pre-judging the leakage of the ultralow temperature valve through temperature difference, and the method comprises the following steps:
s1: assembling a monitoring device according to the connection relation, installing the monitoring device at the outer wall of the valve cover of the ultralow-temperature valve, starting internal power supply equipment, and starting temperature measurement;
s2: transmitting the monitored outer wall temperature data of the valve cover to a server through a mobile network;
s3: after receiving the data, the server calculates the temperature of the inner wall of the valve cover according to the natural convection heat exchange and heat conduction heat exchange theories, and returns the processing result to the monitoring end;
s4: and establishing a mathematical model according to the descending trend of the temperature of the inner wall of the valve cover, judging the change condition of the curve rate, and judging whether the valve has the possibility of leakage.
Further, in S4: the inner wall temperature of the valve cover is not lower than zero degree centigrade, through monitoring the data, whether the inner wall temperature of the valve cover is lower than zero degree centigrade is judged, meanwhile, the change trend of the inner wall temperature of the valve cover is judged, and whether the valve has the possibility of leakage is judged according to the temperature change trend.
Due to the adoption of the technical scheme, the method has the following advantages:
after the data are detected and analyzed, the possibility of valve leakage can be judged, and maintenance preparation is made in advance. The problem of when the ultralow temperature valve is repaired is solved. Emergency repair after leakage is avoided to a certain extent, and environmental pollution and potential safety hazards are reduced;
through the specific design of the temperature measuring device; after the temperature data is received by the combination networking technology, a calculation program for processing the data is obtained; according to the data processing result, the possibility of valve leakage is pre-judged in advance by combining the structural characteristics of the ultralow temperature valve.
Drawings
Fig. 1 is a schematic structural diagram of a monitoring device according to an embodiment of the present invention.
In the figure:
1. gauge outfit 2, connection port 3, protective sheath
4. Temperature probe 5, installation clamp 6 and base
7. Spring 8 and fastener
Detailed Description
The invention is further illustrated by the following examples and figures:
in one embodiment of the present invention, as shown in fig. 1, an apparatus for online pre-judging leakage of an ultra-low temperature valve by temperature difference, comprises: the temperature measuring instrument comprises a gauge head 1, a temperature measuring component and an assembling component, wherein power supply equipment is arranged in the gauge head 1 and has the functions of temperature display, 5G transmission and explosion prevention; the temperature measuring component is connected to one side of the gauge outfit 1 through a connecting port 2; the assembly part is connected to one side of the temperature measuring part far away from the gauge outfit 1 through the base 6, and the assembly part is connected to the outer wall of the valve cover and is mainly used for measuring the temperature of the outer wall of the valve cover after being matched with the outer wall of the valve cover.
As shown in fig. 1, a header 1 is connected to a connection port 2 by a screw, an actual temperature measured in a temperature measuring device is displayed by the header 1, and the actual temperature is transmitted to a server through a mobile network.
The thermometric component shown in FIG. 1 comprises: the temperature probe 4 is connected to the lower end face, far away from the gauge outfit 1, of the connecting port 2; one end and the temperature probe 4 of protective sheath 3 are connected in one side of connection port 2, the other end of protective sheath 3 is connected in the up end of base 6, the inside hollow structure that is of protective sheath 3, whole suit is in the outside of temperature probe 4, simultaneously the length of temperature probe 4 is less than the distance of terminal surface to 6 up end of base under the connection port 2, guaranteed at the temperature measurement in-process, direct contact base 6 not, cause the influence to the temperature measurement result, it is more accurate to set up through protective sheath 3. The base 6 is made of metal material with good heat conduction force, so that the excessive heat conduction resistance is prevented; in this embodiment, the material of base 6 adopts copper, reduces heat conduction resistance, prevents to cause the too big influence monitoring effect of difference in temperature.
The fitting part shown in fig. 1 includes: the installation clamp 5, the spring 7 and the fastener 8, wherein the installation clamp 5 is in a semi-annular shape, two ends of the semi-annular shape of the installation clamp 5 are provided with outer edges, and holes for the fastener 8 to pass through are formed in the outer edges; in the installation process of the monitoring device, the installation clamps 5 are arranged in pairs, concave surfaces of the installation clamps 5 are oppositely arranged and sleeved on the outer wall of the valve cover, the installation clamps 5 are made of the same material as the valve cover, the temperature of the outer wall of the valve can be well conducted to the base 6, two ends of the installation clamps 5 are connected through a pair of fasteners 8, and springs 7 are installed at the connection positions of the heads of the fasteners 8 and the installation clamps 5; in this embodiment, the disc spring is selected for use as spring 7, and mainly plays a role in preventing the clamp from loosening.
The working process of one embodiment of the invention is as follows:
1. assembling a monitoring device according to the connection relation, wherein the monitoring device is arranged on the outer wall of a valve cover of the ultralow-temperature valve through an installation hoop 5, a spring 7 and a fastener 8, and starting power supply equipment inside the gauge outfit 1 to start working;
2. the temperature of the outer wall of the valve is transmitted through a mounting hoop 5 made of the same material as the valve and a base 6 with small heat conduction resistance, the temperature is measured by a temperature probe 4 and then displayed by a gauge outfit 1, and meanwhile, the gauge outfit 1 transmits the monitored data of the temperature of the outer wall of the valve cover to a server through a mobile network;
3. after receiving the data, the server determines parameters in the heat convection and the heat conduction according to the heat convection and the heat conduction principle, namely the heat convection is formed between the outer wall of the valve cover and the air, the heat conduction is formed between the outer wall of the valve cover and the inner wall of the valve cover, the environment of the valve and the operation frequency of the valve are determined, and the parameters are adjusted according to changes in the specific operation process; in this embodiment, the qualitative temperature is first calculated
Wherein t isaIs the ambient temperature, tbThe temperature of the outer wall of the valve is shown as follows: DEG C;
then calculating the air volume expansion coefficient beta as 1/(t + 273);
bringing the air volume expansion coefficient beta into the calculation of Grafaff number
H is the height of the valve cover of the valve, rho is the air density, g is the gravity acceleration, and the temperature difference delta t is ta-tbMu is air viscosity; simultaneous calculation of prandtl numbers
Wherein C ispThe specific heat capacity of air and the lambda of the air heat conductivity coefficient;
the calculated result is taken in to calculate the natural convection heat transfer coefficient of the air
Wherein C is a constant and n is a constant;
simultaneously calculating the external surface area A of the valve cover of the valve0＝πd0H, wherein d0The diameter of the outer surface of the valve cover; the calculated result isCalculating the heat transfer quantity Q ═ alpha A between environment and valve cover0Δt；
Then calculating the logarithmic mean diameter of the valve cover
Wherein d isiIs the diameter of the inner surface of the valve cover, doCalculating the heat transfer area A in the valve cover according to the calculated resultm＝πdmH, then substituting the calculation result to calculate the thermal resistance of the valve cover
Wherein b is the thickness of the valve cover wall, lambdaoHeat transfer coefficient of valve cover material;
finally, the heat transfer quantity Q of the environment and the valve cover and the heat resistance R of the valve cover are respectively substituted into the calculated temperature difference Q.R ═ tb-tcThereby calculating the inner wall temperature t of the sleeve of the inner wall temperature of the valve coverc＝tb-QR; the above parameter values are determined according to the actual operating environment, and the temperature t of the inner wall of the valve cover is obtained by calculationcReturning the processing result to the monitoring end; the most reasonable inner wall temperature calculated is shown in table 1:
table 1 units of valve inner wall temperature: c
4. According to the descending trend of the temperature of the inner wall of the valve cover, a mathematical model is established, and the change condition of the curve rate of the temperature of the inner wall is judged, so that the possibility of valve leakage is judged in advance; in the embodiment, the standard requirement and the structural characteristic of the ultralow temperature valve are combined, namely, the temperature of the specific position of the inner wall of the valve cover is not lower than the requirement of zero degree centigrade, whether the specific position of the inner wall of the valve cover is lower than the zero degree centigrade or not is judged in real time through monitoring data, the change trend of the temperature of the inner wall of the valve cover is judged at the same time, and whether the possibility of leakage of the valve exists or not is judged according to the change trend of the temperature, so that the advance prediction of the leakage of.
The ultra-low temperature valve is monitored on line through the monitoring device and the monitoring method, the temperature difference change trend is analyzed, the structural characteristics of the valve are combined, the heat conduction characteristic of a metal material and the convenience of the industrial Internet of things are combined, a specific mode is established, the method for judging the leakage risk of the valve is adopted, the advancement of the technology and the economical applicability are comprehensively considered, certain prejudgment can be made on the leakage possibility of the valve, and a user can check and maintain the valve in advance.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
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