System and method for monitoring pipeline VOCs sealing points using barrier fluid or gas seals

Abstract

A system and method for monitoring the VOCs sealing points of pipelines with isolation liquid or gas seals, wherein the VOCs sealing points of pipelines are arranged between two connected devices on the pipeline and the pipeline shell components, and are composed of an inner seal, an outer seal, and an isolation sealing liquid or gas located between the inner seal and the outer seal, each isolation sealing liquid is connected to a liquid infusion pipe connected to an accumulator equipped with sealing liquid or gas through a liquid infusion or gas main pipe, the input end of a signal relay station is connected to a sealing liquid or gas flow sensor respectively arranged on each liquid infusion pipe, a pressure sensor arranged on the accumulator, and a liquid level high position sensor and a liquid level low position sensor arranged in the accumulator, the signal relay station is connected to an external server via wireless transmission, the signal relay station is also connected to a control unit connected to a compressor and a pump, the output end of the compressor is connected to the air inlet of the accumulator, and the output end of the pump is connected to the liquid inlet of the accumulator. The position detected by the present invention is accurate, fast, accurate in data, and continuous.

Description

Technical Field

[0001] The present invention relates to a monitoring system for sealing points on equipment loaded with gaseous materials or volatile materials, and in particular to a system and method for monitoring the sealing points of VOCs in pipelines using an isolation liquid or gas seal. Background Art

[0002] Equipment with sealing structures used to load gas materials or volatile materials are equipped with pipelines, valves, flanges, threaded connectors, etc. These parts have seals to prevent leakage of gas materials inside the equipment. Despite the seals, trace amounts of gas materials continue to escape and cause atmospheric pollution. In order to take more accurate measures to reduce material escape, it is necessary to test the concentration of the escaped materials. Figure 1 As shown, a single sealing structure 3701...370n is set at the sealing point of the equipment and pipeline components containing a sealing structure loaded with gas materials or volatile materials to prevent the leakage of materials and cause atmospheric pollution. Despite this, trace gas materials or volatile materials still escape into the atmosphere. Since trace materials are constantly escaping, the single sealing structure 3701...370n needs to be tested for gas material leakage concentration. The detection method is that the detection personnel hold the probe 38 of the instrument and slowly move it as close to the sealing point as possible, wait for the instrument to display the value, and record the concentration value of the gas material escaping from the sealing point, and record the number and listing operation of the sealing point at the same time, and then bring this information back to the operation room to enter the software management platform for calculation and processing, and then send the processed data to the manager to issue a processing instruction.

[0003] In order to prevent the material from escaping, Figure 2 As shown, Figure 1 The single seal structure shown is improved to Figure 2 In the double seal structure shown, a clean sealing liquid / gas system is installed between the double seals, and the pressure of the clean sealing liquid / gas is set to be higher than the pressure of the materials in the equipment and pipelines, thus solving the problem of the materials escaping into the atmosphere. However, it was found that after the improvement, the clean sealing liquid / gas not only leaked into the atmosphere in a small amount, but also leaked into the materials in the equipment and pipelines in a small amount. When the double seal effect is good, the speed of the clean sealing liquid / gas leaking into the material is very slow. On the contrary, when the double seal effect is poor, the speed of the clean sealing liquid / gas leaking into the material is fast. Although the gas VOCs material is always in a "zero leakage" state, it is also necessary to find the double seal position with poor sealing effect so as to take timely measures to reduce the leakage of the clean sealing liquid / gas and ensure the sealing effect of the sealing point.

[0004] The existing technology relies on manual detection of the concentration of materials that have leaked into the atmosphere, which has in fact caused air pollution. Since there are tens of thousands of sealing points on equipment and pipeline components, it takes a huge amount of work to detect each sealing point with the existing technology, and it takes half a year to conduct another detection, that is, the interval between detections at each point is as long as half a year.

[0005] The existing technology is to detect the concentration of leaked gas materials. The density of this concentration is extremely uneven. Even if the probe is equidistant from the sealing point, the concentration at different positions is different. In addition, the weather, wind direction and wind speed all have an impact on the detected concentration. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a system and method for monitoring the VOCs sealing points of pipelines using isolation liquid or gas seals with precise detection position, fast speed, accurate data, continuous detection and reliable performance.

[0007] The technical scheme adopted by the present invention is: a system for monitoring the VOCs sealing points of pipelines with isolation liquid or gas sealing, the sealing structures at several pipeline sealing points on the pipeline loaded with liquid or gas materials are all arranged between two connected devices on the pipeline and the pipeline shell components, and are composed of an inner seal located on the liquid or gas material side, an outer seal located on the atmosphere side, and an isolation sealing liquid or gas located between the inner seal and the outer seal for precise sealing. Each of the devices and the pipeline shell components is formed with a liquid inlet channel with one end connected to the isolation sealing liquid or gas, and the liquid inlet or gas port at the other end of each liquid inlet channel is connected to a liquid infusion pipe, each liquid infusion pipe is connected to one end of the liquid infusion or gas main pipe, and the other end of the liquid infusion or gas main pipe is connected to an accumulator equipped with sealing liquid or gas. The monitoring system includes: a signal relay station , a server and a control unit, the signal input end of the signal relay station is connected to the sealing liquid or gas flow sensor respectively arranged on each infusion tube, the pressure sensor arranged on the accumulator, and the high liquid level sensor and the low liquid level sensor arranged in the accumulator through the acquisition signal line, the signal relay station is connected to the server through wireless transmission to send the collected flow signal, pressure signal and liquid level signal to the server, and receive signals from the server, the signal relay station is also connected to the control unit through the output signal line, and is used to drive the switching action of the control unit according to the signal received from the server, the output end of the control unit is connected to the compressor and the pump through wires, the output end of the compressor is connected to the air inlet of the accumulator through the air supply pipe, and the output end of the pump is connected to the liquid inlet of the accumulator through the liquid supply pipe.

[0008] A method for monitoring the sealing points of pipeline VOCs using isolation liquid or gas seals. It does not need to detect the concentration of gas materials leaking from the sealing points of equipment and pipeline components to the atmosphere. Instead, it uses continuous monitoring of various physical parameters of isolation liquid or gas to detect the quality of the sealing points of equipment and pipeline components. When the gas material or volatile material is always in a zero leakage state, the location of the sealing point where the clean sealing liquid or gas leaks beyond the limit, the sealing point structure, the size of the pipeline component, the material, the maintenance history, the sealing supplier, and the service life information are automatically reported to the manager in a timely manner using wireless transmission and the Internet. Specifically including:

[0009] 1) The signal relay station collects the flow data signal of the sealing liquid or gas in the infusion tube by means of a sealing liquid or gas flow sensor arranged on the infusion tube, and transmits the signal to the server by wireless transmission. The server determines whether the sealing liquid or gas flow in the infusion tube is greater than or equal to the set flow limit. If it is greater than, it indicates that there is a situation where the sealing liquid or gas at the sealing point of the pipeline corresponding to the infusion tube leaks into the material from a trace leakage point on the material side, or leaks into the atmosphere from a trace leakage point on the atmosphere side. The server transmits the flow data signal collected by the sealing liquid or gas flow sensor corresponding to the infusion tube to the client, and the client sends maintenance personnel to repair the sealing point of the pipeline corresponding to the infusion tube;

[0010] 2) When the liquid level in the accumulator drops to the lower limit of the liquid level, the low liquid level sensor is triggered, and the signal relay station collects the low liquid level signal through the low liquid level sensor, and transmits the signal to the server through wireless transmission. The server feeds back the command to turn on the pump to the signal relay station, and the signal relay station turns on the pump through the control unit to replenish the sealing liquid or gas in the accumulator through the liquid replenishing pipe; when the liquid level in the accumulator rises to the upper limit of the liquid level, the high liquid level sensor is triggered, and the signal relay station collects the high liquid level signal through the high liquid level sensor, and transmits the signal to the server through wireless transmission. The server feeds back the command to turn off the pump to the signal relay station, and the signal relay station turns off the pump through the control unit;

[0011] 3) The signal relay station collects the pressure signal of the pressurized gas through the pressure sensor installed on the accumulator, and transmits the pressure signal to the server by wireless transmission. The server determines whether the pressurized gas in the accumulator reaches the set pressure through the pressure signal. If the set pressure is not reached, the server will feed back the command to start the compressor to the signal relay station. The signal relay station starts the compressor through the control unit to replenish the pressurized gas in the accumulator through the air supply pipe until the pressure signal of the pressurized gas collected by the pressure sensor reaches the set pressure. The server feeds back the command to shut down the compressor to the signal relay station, and the signal relay station shuts down the compressor through the control unit.

[0012] The system and method of the present invention for monitoring the VOCs sealing point of a pipeline using an isolation liquid or gas seal has the following advantages:

[0013] 1. The present invention can achieve continuous monitoring when the material is at zero leakage, and once the leakage of clean sealing liquid / gas increases, the information will be uploaded immediately.

[0014] 2. As long as the clean sealing liquid / gas system operates normally, the machine can automatically detect the problem, saving a lot of human resources.

[0015] 3. The monitoring process of the present invention is carried out under the condition of "zero leakage" of gas materials from beginning to end.

[0016] 4. The present invention can achieve accurate detection position, fast speed, accurate data, continuous detection, reliable performance, automation, intelligence, and Internet+.

[0017] 5. Simple maintenance, low maintenance cost and easy operation.

[0018] 6. Eliminate odors and disease causes, improve production environment, and increase health index.

[0019] 7. No daily maintenance required, less consumables.

[0020] 8. Easy to transform and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a gas detection material in the prior art;

[0022] Figure 2 It is a schematic diagram of the structure of a system for monitoring the sealing point of VOCs in a pipeline by using a spacer liquid or a gas seal;

[0023] Figure 3 It is a circuit schematic diagram of the control unit in the present invention.

[0024] In the picture

[0025] 1: Equipment and pipeline shell parts 2: Isolation seal liquid or gas

[0026] 3: Gas material 4: Liquid inlet channel

[0027] 5: Infusion tube 6: Atmosphere

[0028] 7: Inner seal 8: Outer seal

[0029] 9: Liquid or gas inlet 10: Accumulator

[0030] 11: Sealing liquid or gas 12: Sealing liquid or gas flow sensor

[0031] 13: Signal line 14: Signal relay station

[0032] 15: Pressure sensor 16: Liquid level sensor

[0033] 17: Liquid level low sensor 18: Liquid or gas main pipe

[0034] 19: Control unit 20: Server

[0035] 21: Wireless transmission method 22: Output signal line

[0036] 23: Compressor 24: Pump

[0037] 25: Air supply tube 26: Fluid supply tube

[0038] 27: Client 28: Pressure gas

[0039] 29: Micro leakage point on the material side 30: Micro leakage point on the atmosphere side

[0040] 3101~310n+1: Parts that need to be sealed 3401~340n: Gas materials that leak into the atmosphere from the sealing point

[0041] 33: Liquid or gaseous material 36: Atmosphere

[0042] 3701~370n:Seal 38. Gas concentration detection instrument probe

[0043] A: upper limit of liquid level B: lower limit of liquid level

[0044] C: Sealing liquid level KA1: First relay

[0045] KA2: Second relay KM: AC contactor

[0046] FR: Thermal relay FU: Fuse

[0047] Q: Knife switch M: Pump or compressor

[0048] U: Signal relay station power supply voltage DETAILED DESCRIPTION

[0049] The following is a detailed description of the system and method for monitoring VOCs sealing points of pipelines using isolation liquid or gas seals of the present invention in conjunction with the embodiments and drawings.

[0050] like Figure 2As shown, the system of the present invention uses isolation liquid or gas to seal and monitor the VOCs sealing points of pipelines. The sealing structures at several pipeline sealing points on the pipeline loaded with liquid or gas materials 3 are all arranged between two connected devices on the pipeline and the pipeline shell component 1, and are composed of an inner seal 7 located on the liquid or gas material 3 side, an outer seal 8 located on the atmosphere 6 side, and an isolation sealing liquid or gas 2 for precise sealing located between the inner seal 7 and the outer seal 8. Each of the devices and the pipeline shell component 1 is formed with a liquid inlet channel 4 at one end of which is connected to the isolation sealing liquid or gas 2. The liquid inlet or gas port 9 located at the other end of each liquid inlet channel 4 is connected to a liquid infusion pipe 5, and each liquid infusion pipe 5 is connected to one end of a liquid infusion or gas main pipe 18. The other end of the liquid infusion or gas main pipe 18 is connected to a pressure accumulator 10 equipped with sealing liquid or gas 11. The monitoring system includes: a signal relay station 14, a server 20 and a control unit 19. The signal relay The signal input end of the station 14 is connected to the sealing liquid or gas flow sensor 12 respectively arranged on each infusion tube 5, the pressure sensor 15 arranged on the accumulator 10, and the liquid level high sensor 16 and the liquid level low sensor 17 arranged in the accumulator 10 through the acquisition signal line 13. The signal relay station 14 is connected to the server 20 through the wireless transmission mode 21 for sending the collected flow signal, pressure signal and liquid level signal to the server 20, and receiving signals from the server 20. The signal relay station 14 is also connected to the control unit 19 through the output signal line 22, which is used to drive the switch action of the control unit 19 according to the signal received from the server 20. The output end of the control unit 19 is connected to the compressor 23 and the pump 24 through the wire respectively. The output end of the compressor 23 is connected to the air inlet of the accumulator 10 through the air supply pipe 25, and the output end of the pump 24 is connected to the liquid inlet of the accumulator 10 through the liquid supply pipe 26. The server 20 is connected to the client 27 through the wireless transmission mode 21, which is used to transmit the flow signal reaching the limit value to the client 27.

[0051] like Figure 3As shown, the control unit 19 includes a first relay KA1 coil and a second relay KA2 coil respectively connected to the output signal line 22 of the signal relay station 14, and the normally open contacts of the first relay KA1 and the second relay KA2 are respectively connected to a group of switch circuits for starting the compressor 23 and the pump 24. The two groups of switch circuits have the same structure, and are connected to the compressor 23 or the pump 24 in sequence by three-phase power supplies L1, L2, and L3 providing power through knife switch Q, circuit breaker FU, normally open contacts of AC contactor KM and thermal relay FR coil, wherein one output end of the knife switch Q is connected to one end of the AC contactor KM coil through the normally closed contact of the thermal relay FR, and the other end of the AC contactor KM coil is connected to the other output end of the knife switch Q through the normally open contact of the first relay KA1 or the second relay KA2. The signal relay station 14 may adopt a product of the brand Corx, model MQT004, or the brand King Pigeon, model S475, or the brand Zhuxiang Intelligent Technology, model FTK-AC6220, or the brand Zlan, model ZLAN5144J.

[0052] The monitoring method of the system for monitoring the sealing point of pipeline VOCs by using isolation liquid or gas seal of the present invention does not need to detect the concentration of gas materials leaking from the sealing point of equipment and pipeline components into the atmosphere, but uses continuous monitoring of various physical parameters of isolation liquid or gas to detect the quality of the sealing point of equipment and pipeline components. When the gas material or volatile material (VOCs, etc.) is always in a zero leakage state, the sealing point position, sealing point structure, pipeline component size, material, maintenance history record, sealing supplier, service life and other information of the clean sealing liquid or gas leaking beyond the limit value are sent to the manager in a timely manner by wireless transmission and the Internet in the form of automatic reporting. Specifically including:

[0053] 1) The signal relay station 14 collects the flow data signal of the sealing liquid or gas 11 in the infusion tube by means of the sealing liquid or gas flow sensor 12 arranged on the infusion tube, and transmits the signal to the server 20 through the wireless transmission mode 21. The server 20 determines whether the flow of the sealing liquid or gas 11 in the infusion tube is greater than or equal to the set flow limit. If it is greater than, it indicates that there is a situation where the sealing liquid or gas 11 leaks from the micro-leakage point 29 on the material side to the material 3, or leaks from the micro-leakage point 30 on the atmosphere side to the atmosphere 6 at the pipeline sealing point corresponding to the infusion tube. The server 20 transmits the flow data signal collected by the sealing liquid or gas flow sensor 12 corresponding to the infusion tube to the client 27, and the client 27 sends maintenance personnel to repair the pipeline sealing point corresponding to the infusion tube;

[0054] 2) When the liquid level in the accumulator 10 drops to the lower limit B, the low liquid level sensor 17 is triggered, and the signal relay station 14 collects the low liquid level signal through the low liquid level sensor 17, and transmits the signal to the server 20 through the wireless transmission method 21. The server 20 feeds back the instruction of turning on the pump 24 to the signal relay station 14, and the signal relay station 14 turns on the pump 24 through the control unit 19 to replenish the sealing liquid or gas 11 in the accumulator 10 through the liquid replenishing pipe 26; when the liquid level in the accumulator 10 rises to the upper limit A, the high liquid level sensor 16 is triggered, and the signal relay station 14 collects the high liquid level signal through the high liquid level sensor 16, and transmits the signal to the server 20 through the wireless transmission method 21. The server 20 feeds back the instruction of turning off the pump 25 to the signal relay station 14, and the signal relay station 14 turns off the pump 24 through the control unit 19;

[0055] 3) The signal relay station 14 collects the pressure signal of the pressurized gas 28 through the pressure sensor 15 arranged on the accumulator 10, and transmits the pressure signal to the server 20 through the wireless transmission method 21. The server 20 determines whether the pressurized gas 28 in the accumulator 10 reaches the set pressure through the pressure signal. If the set pressure is not reached, the server 20 will feed back the instruction to start the compressor 23 to the signal relay station 14. The signal relay station 14 starts the compressor 23 through the control unit 19 to replenish the pressurized gas 28 in the accumulator 10 through the air supply pipe 25 until the pressure signal of the pressurized gas 28 collected by the pressure sensor 15 reaches the set pressure. The server 20 feeds back the instruction to shut down the compressor 23 to the signal relay station 14, and the signal relay station 14 shuts down the compressor 23 through the control unit 19.

Claims

1. A system for monitoring the sealing points of VOCs in a pipeline using an isolation liquid or gas seal, wherein the sealing structures at the sealing points of a pipeline loaded with a liquid or gas material (3) are arranged between two connected devices on the pipeline and a pipeline shell component (1), and are composed of an inner seal (7) located on the liquid or gas material (3) side, an outer seal (8) located on the atmosphere (6) side, and an isolation seal liquid or gas (2) for precise sealing located between the inner seal (7) and the outer seal (8), each of the devices and the pipeline shell component (1) is formed with a liquid inlet channel (4) at one end of which is connected to the isolation seal liquid or gas (2), and a liquid inlet or gas port (9) at the other end of each liquid inlet channel (4) is connected to a liquid infusion pipe (5), each liquid infusion pipe (5) is connected to one end of a liquid infusion or gas main pipe (18), and the other end of the liquid infusion or gas main pipe (18) is connected to a pressure accumulator (10) loaded with sealing liquid or gas (11), characterized in that: The monitoring system comprises: a signal relay station (14), a server (20) and a control unit (19); the signal input end of the signal relay station (14) is connected to a sealing liquid or gas flow sensor (12) respectively arranged on each infusion tube (5), a pressure sensor (15) arranged on the pressure accumulator (10), and a liquid level high position sensor (16) and a liquid level low position sensor (17) arranged in the pressure accumulator (10) through a collection signal line (13); the signal relay station (14) is connected to the server (20) through a wireless transmission method (21) for sending the collected flow signal, pressure signal and liquid level signal to the server (20), and receiving the collected flow signal, pressure signal and liquid level signal from the server (20) The signal relay station (14) is also connected to the control unit (19) via an output signal line (22) and is used to drive the switch action of the control unit (19) according to the signal received from the server (20). The output end of the control unit (19) is connected to the compressor (23) and the pump (24) via wires respectively. The output end of the compressor (23) is connected to the air inlet of the accumulator (10) via an air supply pipe (25), and the output end of the pump (24) is connected to the liquid inlet of the accumulator (10) via a liquid supply pipe (26). The server (20) is connected to the client (27) via a wireless transmission method (21) and is used to transmit the flow rate signal reaching the limit value to the client (27).

2. The system for monitoring the VOCs sealing point of a pipeline using a spacer liquid or gas seal according to claim 1, characterized in that: The control unit (19) comprises a first relay (KA1) coil and a second relay (KA2) coil respectively connected to an output signal line (22) of the signal relay station (14); the normally open contacts of the first relay (KA1) and the second relay (KA2) are respectively connected to a group of switch circuits for starting a compressor (23) and a pump (24); the two groups of switch circuits have the same structure, and are connected to the compressor (23) or the pump (24) by a three-phase power supply (L1, L2, L3) providing power in sequence through a knife switch (Q), a breaker (FU), a normally open contact of an AC contactor (KM) and a thermal relay (FR) coil; wherein one output end of the knife switch (Q) is connected to one end of the AC contactor (KM) coil through the normally closed contact of the thermal relay (FR); and the other end of the AC contactor (KM) coil is connected to the other output end of the knife switch (Q) through the normally open contact of the first relay (KA1) or the second relay (KA2).

3. A method for monitoring the VOCs sealing point of a pipeline using a spacer liquid or gas seal according to claim 1, characterized in that: It is not necessary to detect the concentration of gas materials leaking from the sealing points of equipment and pipeline components into the atmosphere. Instead, the various physical parameters of the isolation liquid or gas are continuously monitored to detect the quality of the sealing points of equipment and pipeline components. When the gas material or volatile material is always in a zero leakage state, the sealing point location, sealing point structure, pipeline component size, material, maintenance history, sealing supplier, and service life information of the clean sealing liquid or gas that leaks beyond the limit value are automatically reported to the manager in a timely manner using wireless transmission and the Internet; specifically, the following are included: 1) The signal relay station (14) collects the flow data signal of the sealing liquid or gas (11) in the infusion tube by means of a sealing liquid or gas flow sensor (12) arranged on the infusion tube, and transmits the signal to the server (20) via a wireless transmission method (21). The server (20) determines whether the flow of the sealing liquid or gas (11) in the infusion tube is greater than or equal to a set flow limit value. If it is greater than, it indicates that there is a situation where the sealing liquid or gas (11) leaks from a trace leakage point (29) on the material side into the material (3), or leaks from a trace leakage point (30) on the atmosphere side into the atmosphere (6) at the pipeline sealing point corresponding to the infusion tube. The server (20) transmits the flow data signal collected by the sealing liquid or gas flow sensor (12) corresponding to the infusion tube to the client (27), and the client (27) sends maintenance personnel to repair the pipeline sealing point corresponding to the infusion tube; 2) When the liquid level in the pressure accumulator (10) drops to the lower limit (B), the low liquid level sensor (17) is triggered, the signal relay station (14) collects the low liquid level signal through the low liquid level sensor (17), and transmits the signal to the server (20) through the wireless transmission method (21), the server (20) feeds back the command of starting the pump (24) to the signal relay station (14), and the signal relay station (14) starts the pump (24) through the control unit (19) to supply the pressure accumulator with liquid through the liquid supply pipe (26). (10) replenishes sealing liquid or gas (11); when the liquid level in the accumulator (10) rises to the upper limit of the liquid level (A), the high liquid level sensor (16) is triggered, the signal relay station (14) collects the high liquid level signal through the high liquid level sensor (16), and transmits the signal to the server (20) through the wireless transmission method (21), the server (20) feeds back the instruction of shutting down the pump (25) to the signal relay station (14), and the signal relay station (14) shuts down the pump (24) through the control unit (19); 3) The signal relay station (14) collects a pressure signal of the pressure gas (28) through a pressure sensor (15) disposed on the pressure accumulator (10), and transmits the pressure signal to the server (20) through a wireless transmission method (21). The server (20) determines whether the pressure gas (28) in the pressure accumulator (10) has reached a set pressure through the pressure signal. If the pressure has not reached the set pressure, the server (20) feeds back an instruction to start the compressor (23) to the signal relay station (14). The signal relay station (14) starts the compressor (23) through the control unit (19) to replenish the pressure gas (28) in the pressure accumulator (10) through the air supply pipe (25) until the pressure signal of the pressure gas (28) collected by the pressure sensor (15) reaches the set pressure. The server (20) feeds back an instruction to shut down the compressor (23) to the signal relay station (14). The signal relay station (14) shuts down the compressor (23) through the control unit (19).

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