Calibration system of sulfur hexafluoride gas recovery equipment

Abstract

The invention relates to a calibration system of sulfur hexafluoride gas recovery equipment. The detection device comprises a detection container and a sulfur hexafluoride sensor communicated with the detection container through a first pipeline, an inlet of the detection container is communicated with the sampling port, an outlet of the sulfur hexafluoride sensor is connected with a first flow control valve, and an outlet of the first flow control valve is communicated with an inlet of the processing module; the zero-gas cleaning device is communicated with the detection container and is used for adding quantitative nitrogen into the detection container to carry out zero-gas cleaning; the gas supplementing device comprises a sulfur hexafluoride storage tank with set concentration, a gas supplementing pump and a second flow control valve, an inlet of the gas supplementing pump is communicated with the sulfur hexafluoride storage tank, and an outlet of the gas supplementing pump is communicated with the carbon steel storage tank through the second flow control valve. According to the device, detected gas can be guided into recovery equipment to be recovered, zero-gas cleaning can be carried out on a system pipeline of the detection device, cleaning mixed gas can be recycled, and it can be ensured that the concentration of sulfur hexafluoride gas in a carbon steel storage tank is kept unchanged.

Description

TECHNICAL FIELD

[0001] The present application relates to a calibration system of a sulfur hexafluoride gas recovery device. BACKGROUND

[0002] The sulfur hexafluoride gas recovery device is a special device for recovering the sulfur hexafluoride gas in the arc extinguishing chamber of a circuit breaker. Its working principle is mainly based on the cold liquefaction method and the multi-stage purification technology. Through the steps of compression, cooling, separation, etc., the SF6 gas is efficiently recovered, purified and stored. It mainly includes a processing module composed of compression, refrigeration, purification, vacuum, etc. and a storage subsystem mainly composed of a carbon steel storage tank. The recovery device needs to be calibrated regularly to ensure the recovery efficiency, recovery quality and safety, etc. In order to ensure its safety and reusability, the concentration of sulfur hexafluoride gas in the carbon steel storage tank of the recovery device needs to be detected every certain period of time. On the one hand, it is to determine whether it is leaking, and on the other hand, it is to detect the stability to ensure that its purity is stable at a certain value. After the purity is stable, it can only meet the conditions for recharging to the arc extinguishing chamber of the circuit breaker by reaching the set purity through purification.

[0003] However, in the existing detection method, the gas from the sampling port of the carbon steel storage tank enters the detection device for detection. After detection, this part of gas is generally exhausted, which not only pollutes the atmosphere, but also wastes sulfur hexafluoride gas. SUMMARY

[0004] The purpose of the present application is to provide a calibration system of a sulfur hexafluoride gas recovery device, which can not only introduce the sample gas for detection into the inlet of the recovery device for recycling, but also can perform zero gas cleaning on the system pipeline of the detection device and introduce the cleaning mixed gas into the inlet of the recovery device for recycling, and can also ensure that the concentration of sulfur hexafluoride gas in the carbon steel storage tank remains unchanged so as not to affect the subsequent concentration detection.

[0005] The technical scheme of the present application is as follows: a calibration system of a sulfur hexafluoride gas recovery device comprises: The sulfur hexafluoride gas recovery device comprises a processing module and a carbon steel storage tank connected in sequence, and the carbon steel storage tank comprises a sampling port; A detection device comprises a detection container and a sulfur hexafluoride sensor connected with the detection container through a first pipeline. The inlet of the detection container is connected with the sampling port, and the outlet of the sulfur hexafluoride sensor is connected with a first flow control valve. The outlet of the first flow control valve is connected with the inlet of the processing module; A zero gas cleaning device is connected with the detection container for adding a certain amount of nitrogen gas to the detection container for zero gas cleaning; The gas supplementing device comprises a sulfur hexafluoride tank with a set concentration, a gas supplementing pump and a second flow control valve, the inlet of the gas supplementing pump is communicated with the sulfur hexafluoride tank, and the outlet is communicated with the carbon steel tank through the second flow control valve. During operation, the gas supplementing device supplements a corresponding amount of sulfur hexafluoride gas with the set concentration according to the intake amount of zero gas cleaning and the sulfur hexafluoride gas concentration of the sulfur hexafluoride tank, so as to keep the sulfur hexafluoride concentration in the carbon steel tank unchanged.

[0006] The calibration system of the sulfur hexafluoride gas recovery equipment has the following advantages: during use, the inlet of the processing module of the recovery equipment is communicated with the arc extinguishing chamber of the circuit breaker to recover sulfur hexafluoride gas therefrom, and then the sulfur hexafluoride gas is stored in the carbon steel tank after being compressed, refrigerated, purified and vacuumized by the processing module; the inlet of the detection container of the detection device is communicated with the sampling port of the carbon steel tank, so that the sample in the carbon steel tank enters the detection container, and then the sample flows through the sulfur hexafluoride sensor through the first pipeline, so as to detect the concentration value of the sulfur hexafluoride gas in the sample; after this sampling is completed, the detection device needs to be cleaned to avoid interference of residual sulfur hexafluoride gas on subsequent concentration detection; in the case of being disconnected from the sampling port, a certain amount of nitrogen gas is added to the detection container by the zero gas cleaning device to clean and remove the residual gas in the detection container and the connected pipeline; however, the cleaned gas contains sulfur hexafluoride gas, which is toxic and a greenhouse gas, and direct emission will pollute the environment and cause waste; therefore, the cleaned gas is introduced into the processing module of the recovery equipment for recycling; however, the detection device needs to detect the carbon steel tank once every certain period of time, and if the cleaned gas after the last detection is directly treated and introduced into the carbon steel tank, the sulfur hexafluoride gas concentration in the carbon steel tank will be affected, and the accuracy of subsequent detection will be affected; therefore, the present application compensates the concentration by the gas supplementing device, and the amount of sulfur hexafluoride gas that needs to be supplemented by the gas supplementing device is calculated based on the amount of nitrogen gas added by the zero gas cleaning device, the original concentration of the sulfur hexafluoride gas in the carbon steel tank during detection and the concentration of the sulfur hexafluoride gas in the gas supplementing device.

[0007] As can be seen from the above working process, the technical scheme of the present application not only can realize detection of the sulfur hexafluoride gas concentration of the recovery equipment, but also can recycle the detected gas, clean the detection device by zero gas cleaning to not affect the next detection, and supplement the sulfur hexafluoride gas by the gas supplementing device, so that the cleaned gas does not affect the original concentration of the sulfur hexafluoride gas in the carbon steel tank after being added into the carbon steel tank, thereby ensuring the accuracy of subsequent regular detection.

[0008] On the basis of the above scheme, further improved as follows, the carbon steel storage tank includes a tank body with an axis vertically arranged and a piston slidingly and sealingly fitted in the tank body in the up-down direction, the tank body is connected with the processing module, the air supplementing device and the connecting port of the sampling port at the upper end of the tank body, the lower end of the tank body is provided with a constant pressure port, the constant pressure device is connected with the constant pressure port, the constant pressure device includes a pressure sensor for detecting the pressure at the constant pressure port, and the pressure in the tank body is maintained constant by charging air into the area below the piston or discharging air from the area below the piston.

[0009] The beneficial effects of the technical scheme are as follows: the setting of the constant pressure device can ensure that the carbon steel storage tank is in a constant pressure range, avoiding the influence of the pressure change of the carbon steel storage tank on the amount of the subsequent collected sample, because the amount of the sample gas flowing out of the sampling port in a set time is different under different pressures, which will have a certain influence on the detection result, in order to prevent this adverse effect, the piston and the constant pressure device are matched, when the carbon steel storage tank enters more sulfur hexafluoride gas, the piston goes down to discharge the excess air, when the carbon steel storage tank enters less sulfur hexafluoride gas, the piston goes up to supplement the air, so as to ensure that the overall air pressure in the carbon steel storage tank is constant, that is, the pressure of the sulfur hexafluoride gas above the piston in the carbon steel storage tank is constant.

[0010] On the basis of the above scheme, further improved as follows, the first pipeline is provided with a stop valve, the detection container is connected with a second pipeline, the second pipeline is sequentially connected with a first switching valve, a dryer, a humidity sensor and a second switching valve in series, the dryer is connected with a first branch in parallel, one end of the first branch is communicated with the outlet of the dryer, and the other end is communicated with the other outlet of the first switching valve, and the two outlets of the second switching valve are respectively communicated with the inlet and the outlet of the sulfur hexafluoride sensor. When the humidity of the gas in the detection container is greater than the set value, the stop valve is closed, the first switching valve is switched to be communicated with the dryer, and the second switching valve is switched to be communicated with the inlet of the sulfur hexafluoride sensor. When the humidity of the gas in the detection container is less than the set value, the stop valve is opened, the first switching valve is switched to be communicated with the first branch, and the second switching valve is switched to be communicated with the outlet of the sulfur hexafluoride sensor.

[0011] The beneficial effects of the technical scheme are as follows: through the setting of the stop valve, the second pipeline, the first switching valve, the dryer, the humidity sensor, the second switching valve and the first branch, when the humidity of the sample is large, the sample needs to be dried and dehumidified first, and then the concentration is detected, when the humidity of the sample is small, the concentration can be directly detected, so as to avoid the influence of the humidity of the sample on the concentration detection result as much as possible.

[0012] On the basis of the above scheme, further improved as follows, the sulfur hexafluoride sensor includes a high-range sensor adopting a thermal conductivity principle and a low-concentration sensor adopting a non-dispersive infrared absorption spectrum principle.

[0013] On the basis of the above scheme, further improved as follows, the detection container is connected with a trace oxygen sensor.

[0014] On the basis of the above scheme, further improved as follows, the zero gas cleaning device comprises a nitrogen gas storage tank, a nitrogen gas pump and a third flow control valve.

[0015] On the basis of the above scheme, further improved as follows, the constant pressure device comprises an inflation pump and a fourth flow control valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A system principle schematic diagram of a specific embodiment of a calibration system of a sulfur hexafluoride gas recovery equipment; Figure 2 A principle schematic diagram of a detection device in Figure 1 ; In the figure: 1 - circuit breaker arc chamber, 2 - sulfur hexafluoride gas recovery equipment, 21 - processing module, 22 - carbon steel storage tank, 221 - sampling port, 222 - piston, 223 - constant pressure port, 224 - pressure sensor, 225 - inflation pump, 226 - fourth flow control valve, 3 - detection device, 31 - detection container, 32 - first pipeline, 321 - stop valve, 33 - high range sensor, 34 - low concentration sensor, 35 - first flow control valve, 36 - second pipeline, 37 - first switching valve, 38 - dryer, 39 - humidity sensor, 310 - second switching valve, 311 - first branch, 312 - trace oxygen sensor, 4 - zero gas cleaning device, 41 - nitrogen gas storage tank, 42 - nitrogen gas pump, 43 - third flow control valve, 5 - air supplementing device, 51 - sulfur hexafluoride storage tank, 52 - air supplementing pump, 53 - second flow control valve. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application, that is, the described examples are only a part of the examples of the present application, but not all the examples. The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present application.

[0019] It is to be understood that the terms "first", "second", and so on, and the like, are used merely to distinguish one entity or action from another, and do not necessarily require or imply any actual relationship or order between such entities or actions. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by an "including a" statement does not exclude the existence of additional identical elements in the process, method, article, or apparatus including the element.

[0020] The features and advantages of the present application will be further described in the following detailed description of embodiments.

[0021] A specific embodiment of a calibration system of a sulfur hexafluoride gas recovery apparatus according to the present application is as follows: Figures 1-2 As shown in the figure, the calibration system of the sulfur hexafluoride gas recovery apparatus includes a sulfur hexafluoride gas recovery apparatus 2, a detection device 3, a zero gas cleaning device 4, and a gas supplementing device 5.

[0022] The sulfur hexafluoride gas recovery device 2 comprises a processing module 21 and a carbon steel tank 22 connected in sequence, the carbon steel tank 22 comprises a sampling port 221, the processing module 21 is a prior art and will not be described herein, and the carbon steel tank 22 is consistent with the shape of the prior art carbon steel tank 22, and is internally provided with a piston 222, the piston 222 is slidingly assembled in the carbon steel tank 22 through a sealing ring, and the carbon steel tank 22 is provided with an interface at the upper end and the lower end, respectively, and is provided with a one-way valve at the interface, and the one-way valve is opened when the interface is connected. The carbon steel tank 22 comprises a tank body with an axis vertically arranged and the piston 222 slidingly and sealingly assembled in the tank body in the up-down direction, the connection port of the tank body, the processing module 21, the air supplementing device 5 and the sampling port 221 is located at the upper end of the tank body, and the lower end of the tank body is provided with a constant pressure port 223, the constant pressure port 223 is connected with a constant pressure device, the constant pressure device comprises a pressure sensor 224 for detecting the pressure at the constant pressure port 223, and the pressure in the tank body is maintained constant by means of charging air into the area below the piston 222 or discharging air from the area below the piston 222. The constant pressure device comprises an air charging pump 225 and a fourth flow control valve 226. The arrangement of the constant pressure device can ensure that the carbon steel tank 22 is in a constant pressure range, and avoid affecting the amount of subsequent sample collection due to the pressure change of the carbon steel tank 22, because the amount of sample gas flowing out of the sampling port 221 in a set time is different under different pressures, which will cause certain influence on the detection result. In order to prevent this adverse effect, the piston 222 and the constant pressure device are matched, when the carbon steel tank 22 enters more sulfur hexafluoride gas, the piston 222 goes down to discharge excess air, when the carbon steel tank 22 enters less sulfur hexafluoride gas, the piston 222 goes up to supplement air, so as to ensure that the overall air pressure in the carbon steel tank 22 is constant, that is, the pressure of the sulfur hexafluoride gas above the piston 222 in the carbon steel tank 22 is constant.

[0023] As Figure 2As shown, the detection device 3 comprises a detection container 31 and a sulfur hexafluoride sensor (in this embodiment, a high-range sensor 33) in communication with the detection container 31 through a first pipeline 32. The inlet of the detection container 31 is in communication with the sampling port 221, and the outlet of the sulfur hexafluoride sensor is connected with a first flow control valve 35. The outlet of the first flow control valve 35 is in communication with the inlet of the processing module 21. A stop valve 321 is arranged on the first pipeline 32. The detection container 31 is connected with a second pipeline 36. The second pipeline 36 is sequentially connected with a first switching valve 37, a dryer 38, a humidity sensor 39 and a second switching valve 310 in series. The dryer 38 is connected with a first branch 311 in parallel. One end of the first branch 311 is in communication with the outlet of the dryer 38, and the other end is in communication with the other outlet of the first switching valve 37. The two outlets of the second switching valve 310 are in communication with the inlet and the outlet of the sulfur hexafluoride sensor, respectively. When the humidity of the gas in the detection container 31 is greater than a set value, the stop valve 321 is closed, the first switching valve 37 is switched to be in communication with the dryer 38, and the second switching valve 310 is switched to be in communication with the inlet of the sulfur hexafluoride sensor. When the humidity of the gas in the detection container 31 is less than the set value, the stop valve 321 is opened, the first switching valve 37 is switched to be in communication with the first branch 311, and the second switching valve 310 is switched to be in communication with the outlet of the sulfur hexafluoride sensor. Through the arrangement of the stop valve 321, the second pipeline 36, the first switching valve 37, the dryer 38, the humidity sensor 39, the second switching valve 310 and the first branch 311, the sample needs to be dried and dehumidified when the humidity of the sample is high, and then the concentration of the sample is detected. When the humidity of the sample is low, the concentration can be directly detected, so as to avoid the influence of the humidity of the sample on the detection result of the concentration as much as possible. The sulfur hexafluoride sensor comprises a high-range sensor 33 adopting a thermal conductivity principle and a low-concentration sensor 34 adopting a non-dispersive infrared absorption spectrum principle. The detection container 31 is connected with a trace oxygen sensor 312.

[0024] The zero-gas cleaning device 4 is in communication with the detection container 31 for adding a certain amount of nitrogen gas into the detection container 31 for zero-gas cleaning. The zero-gas cleaning device 4 comprises a nitrogen gas storage tank 41, a nitrogen gas pump 42 and a third flow control valve 43.

[0025] The gas supplementing device 5 comprises a sulfur hexafluoride storage tank 51 of a set concentration, a gas supplementing pump 52 and a second flow control valve 53. The inlet of the gas supplementing pump 52 is in communication with the sulfur hexafluoride storage tank 51, and the outlet thereof is in communication with the carbon steel storage tank 22 through the second flow control valve 53. In operation, the gas supplementing device 5 supplements a corresponding amount of sulfur hexafluoride gas of a set concentration according to the amount of the inlet gas of the zero-gas cleaning and the concentration of the sulfur hexafluoride gas in the sulfur hexafluoride storage tank 51, so as to keep the concentration of the sulfur hexafluoride in the carbon steel storage tank 22 unchanged.

[0026] The calibration system of the sulfur hexafluoride gas recovery device 2 is in use, the inlet of the processing module 21 of the recovery device is communicated with the circuit breaker arc extinguishing chamber 1 to recover sulfur hexafluoride gas therefrom, and then the sulfur hexafluoride gas is stored in the carbon steel storage tank 22 after being compressed, refrigerated, purified, vacuumized and the like by the processing module 21; the inlet of the detection container 31 of the detection device 3 is communicated with the sampling port 221 of the carbon steel storage tank 22 so that the sample in the carbon steel storage tank 22 enters the detection container 31, and then the sample flows through the sulfur hexafluoride sensor through the first pipeline 32 to detect the concentration value of the sulfur hexafluoride gas in the sample; after this sampling is completed, the detection device 3 needs to be cleaned to avoid interference of residual sulfur hexafluoride gas on subsequent concentration detection; in the case of being disconnected from the sampling port 221, a certain amount of nitrogen gas is added to the detection container 31 by the zero gas cleaning device 4 to clean and remove the residual gas in the detection container 31 and the connected pipeline, but since the cleaned gas contains sulfur hexafluoride gas, which is toxic and a greenhouse gas, direct emission will pollute the environment and cause waste, so the gas is introduced into the processing module 21 of the recovery device for recycling, but since the detection device 3 needs to detect the carbon steel storage tank 22 once every certain period of time, if the gas cleaned after the last detection is directly treated and introduced into the carbon steel storage tank 22, the concentration of the sulfur hexafluoride gas in the carbon steel storage tank 22 will be affected, and the accuracy of subsequent detection will be affected, therefore, the application compensates the concentration by the gas supplementing device 5, the amount of the nitrogen gas added by the zero gas cleaning device 4, the original concentration of the sulfur hexafluoride gas in the carbon steel storage tank 22 detected in this detection, and the concentration of the sulfur hexafluoride gas in the gas supplementing device 5 are used to calculate the amount of the sulfur hexafluoride gas that needs to be supplemented by the gas supplementing device 5. The technical scheme of the application not only can realize detection of the concentration of the sulfur hexafluoride gas of the recovery device, but also can recycle the detected gas, clean the detection device 3 by zero gas cleaning to not affect the next detection, and supplement the sulfur hexafluoride gas by the gas supplementing device 5 so that the cleaned gas does not affect the original concentration of the sulfur hexafluoride gas in the carbon steel storage tank 22 after being added to the carbon steel storage tank 22, thereby ensuring the accuracy of subsequent regular detection.

[0027] The above is only a preferred embodiment of the application and is not used to limit the application, the patent protection scope of the application is subject to the claims, any equivalent structural changes made by using the content of the specification and drawings of the application should also be included in the protection scope of the application.

Claims

1. A calibration system of a sulfur hexafluoride gas recovery device, comprising: a sulfur hexafluoride gas recovery device comprising a treatment module and a carbon steel tank in sequence communication, the carbon steel tank comprising a sampling port; characterized in that it further comprises: a detection device comprising a detection container and a sulfur hexafluoride sensor in communication with the detection container through a first pipeline, the inlet of the detection container being in communication with the sampling port, the outlet of the sulfur hexafluoride sensor being connected with a first flow control valve, the outlet of the first flow control valve being in communication with the inlet of the treatment module; a zero gas purging device in communication with the detection container for adding a quantitative amount of nitrogen gas into the detection container for zero gas purging; a gas supplementing device comprising a sulfur hexafluoride tank of a set concentration, a gas supplementing pump and a second flow control valve, the inlet of the gas supplementing pump being in communication with the sulfur hexafluoride tank, the outlet being in communication with the carbon steel tank through the second flow control valve; in operation, the gas supplementing device supplements a corresponding amount of sulfur hexafluoride gas of the set concentration according to the gas intake amount of the zero gas purging and the sulfur hexafluoride gas concentration of the sulfur hexafluoride tank, so as to keep the sulfur hexafluoride concentration in the carbon steel tank unchanged.

2. The calibration system of a sulfur hexafluoride gas recovery plant according to claim 1, characterized in that, the carbon steel tank comprises a tank body arranged vertically along an axis and a piston slidingly and sealingly fitted in the tank body, the connection ports of the tank body, the treatment module, the gas supplementing device and the sampling port being located at the upper end of the tank body, the lower end of the tank body being provided with a constant pressure port, the constant pressure port being connected with a constant pressure device, the constant pressure device comprising a pressure sensor for detecting the pressure at the constant pressure port, the pressure in the tank body being kept constant by means of charging air into the area below the piston or discharging air from the area below the piston.

3. The calibration system of a sulfur hexafluoride gas recovery plant according to claim 1, characterized in that, a stop valve is provided on the first pipeline, a second pipeline is connected to the detection container, the second pipeline is in sequence connected with a first switching valve, a dryer, a humidity sensor and a second switching valve in series, the dryer is connected with a first branch in parallel, one end of the first branch is in communication with the outlet of the dryer and the other end is in communication with the other outlet of the first switching valve, the two outlets of the second switching valve are in communication with the inlet and outlet of the sulfur hexafluoride sensor respectively; when the gas humidity in the detection container is greater than a set value, the stop valve is closed, the first switching valve is switched to be in communication with the dryer, and the second switching valve is switched to be in communication with the inlet of the sulfur hexafluoride sensor; when the gas humidity in the detection container is less than a set value, the stop valve is opened, the first switching valve is switched to be in communication with the first branch, and the second switching valve is switched to be in communication with the outlet of the sulfur hexafluoride sensor.

4. The calibration system of a sulfur hexafluoride gas recovery plant according to claim 1, characterized in that, The sulfur hexafluoride sensor comprises a high-range sensor adopting a thermal conductivity principle and a low-concentration sensor adopting a non-dispersive infrared absorption spectrum principle.

5. The calibration system of a sulfur hexafluoride gas recovery plant according to claim 1, wherein A trace oxygen sensor is connected to the detection container.

6. The calibration system of a sulfur hexafluoride gas recovery plant according to claim 1, wherein The zero gas purging device comprises a nitrogen gas tank, a nitrogen gas pump and a third flow control valve.

7. The calibration system of a sulfur hexafluoride gas recovery plant according to claim 2, wherein The constant pressure device comprises an air charging pump and a fourth flow control valve.

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