Emergency pressure supplementing system for sudden interruption of factory instrument wind

Abstract

The utility model discloses an emergency pressure supplementing system for sudden interruption of factory instrument wind, and belongs to the technical field of chemical instruments. According to the technical scheme, the emergency pressure supplementing system for sudden interruption of factory instrument air comprises an air compressor A, an air compressor B parallel to the air compressor A, an air compressor C, a water cooler, an industrial air buffer tank, a dryer, an instrument air buffer tank, a dry air buffer tank, an adsorption tank, a nitrogen buffer tank and a controller. The air compressor A, the air compressor B and the air compressor C are communicated through pipelines, and communicating valves are arranged on the pipelines through which the air compressor A, the air compressor B and the air compressor C are communicated with one another; the adsorption tank comprises an adsorption tank A and an adsorption tank B which are arranged in parallel, an adsorption tank connecting pipeline I and an adsorption tank connecting pipeline II are arranged between the adsorption tank A and the adsorption tank B, the adsorption tank connecting pipeline I is provided with a control valve III and a control valve IV, and the adsorption tank connecting pipeline II is provided with a control valve V and a control valve VI. According to the utility model, continuous and stable supply of the instrument air pipe network can be maintained.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical instrument, concretely relates to an emergency pressure compensation system of factory instrument air sudden interruption. BACKGROUND

[0002] Instrument air plays a vital role in the production and operation of chemical enterprises, which is mainly used to drive various pneumatic actuators, and these actuators are key control components in the production process of chemical industry. Instrument air realizes the opening and closing operation of pneumatic valves and the balance adjustment in some complex processes through accurate air pressure control. These operations have irreplaceable effects on maintaining the stable operation of production devices and ensuring the accurate control of process flow. Once the pressure fluctuation or air source interruption of instrument air system occurs, it is easy to cause process fluctuation of production device, material leakage, and even serious accidents such as fire and explosion, which poses a serious threat to personnel and equipment safety. The stability and reliability of instrument air directly affect the production safety and efficiency. The public engineering system has high requirements for instrument air. In addition to providing stable and reliable power source for production devices, the air source quality should also meet the requirements of no oil, no water and no solid particle impurities. In order to meet these requirements, chemical enterprises usually take a series of measures to ensure the stable operation of instrument air system. For example, regular maintenance and repair of instrument air system to find and handle potential safety hazards in time, and use of advanced air source purification technology to ensure that the air source quality meets the standard requirements. However, the existing public engineering system still has problems of unstable instrument air pipe network pressure and inability to respond to air compressor failure in time when dealing with air compressor failure. SUMMARY

[0003] The utility model provides a kind of emergency pressure compensation system of factory instrument air sudden interruption, to maintain the sustained and stable supply of instrument air pipe network.

[0004] The technical scheme of the utility model is as follows:

[0005] The emergency pressure compensation system of factory instrument air sudden interruption includes air compressor A, air compressor B and air compressor C which are arranged in parallel with air compressor A, water cooler, industrial air buffer tank, dryer, instrument air buffer tank, dry air buffer tank, adsorption tank, nitrogen buffer tank and controller. Air compressor A, air compressor B and air compressor C are connected by pipeline, and the pipeline connected with each other of air compressor A, air compressor B and air compressor C is provided with communication valve.

[0006] The adsorption tank includes adsorption tank A and adsorption tank B arranged in parallel, adsorption tank connection pipeline one and adsorption tank connection pipeline two are arranged between the adsorption tank A and the adsorption tank B, the adsorption tank connection pipeline one is provided with control valve three and control valve four, the adsorption tank connection pipeline two is provided with control valve five and control valve six, the adsorption tank B is communicated with the dry air buffer tank through a pipeline, the pipeline connected with the adsorption tank B and the dry air buffer tank is provided with control valve two, the adsorption tank connection pipeline one is connected with the vent pipeline one, and the vent pipeline one is provided with control valve eight.

[0007] The air compressor A is connected with the water cooler through a pipeline, two pipelines are arranged at the compressed air outlet of the water cooler, one pipeline is connected with the industrial air buffer tank, and the other pipeline is sequentially connected with the dryer and the instrument air buffer tank; the instrument air buffer tank is connected with the instrument air pipe network through an instrument air outlet pipeline; the instrument air outlet pipeline is provided with a one-way valve two, a flow sensor one and a pressure sensor five; the pipeline between the air compressor A and the water cooler is provided with an on-off valve one and a one-way valve one; the pipeline between the dryer and the instrument air buffer tank is provided with an instrument air filter; the flow sensor one and the pressure sensor five are electrically connected with the controller.

[0008] The air compressor C is connected with the air cooling and drying machine through a pipeline; the pipeline between the air compressor C and the air cooling and drying machine is provided with an on-off valve three, a one-way valve three and a filter one; the air cooling and drying machine is sequentially connected with a trace level filter, a submicron filter, an activated carbon filter and a dry air buffer tank through a pipeline; the dry air buffer tank is provided with a dry air outlet pipeline; the dry air outlet pipeline is connected with the adsorption tank A; the dry air outlet pipeline is provided with a control valve one; the adsorption tank A is connected with the nitrogen buffer tank through an adsorption tank A gas outlet pipeline; the adsorption tank A gas outlet pipeline is provided with a control valve five, a control valve seven and a one-way valve.

[0009] The instrument air buffer tank is provided with a safety valve one and a pressure sensor one at the top; the instrument air outlet pipeline is further connected with a vent pipeline two; the vent pipeline two is provided with a pressure control valve one; the pressure control valve one and the pressure sensor one are electrically connected with the controller.

[0010] The nitrogen buffer tank is connected with the nitrogen storage tank through a pipeline; the nitrogen storage tank is provided with a low-pressure nitrogen outlet pipeline and a low-pressure nitrogen vent pipeline, a safety valve two and a pressure sensor three at the top; the low-pressure nitrogen vent pipeline is provided with a pressure control valve three; the pressure sensor three and the pressure control valve three are electrically connected with the controller; the low-pressure nitrogen outlet pipeline is connected with a low-pressure nitrogen pipe network; the low-pressure nitrogen outlet pipeline is provided with a one-way valve four, a flow sensor four and a pressure sensor four; the flow sensor four and the pressure sensor four are electrically connected with the controller.

[0011] The low-pressure nitrogen outlet pipeline is communicated with the instrument air outlet pipeline through a low-pressure nitrogen pressure compensation pipeline; the low-pressure nitrogen pressure compensation pipeline is provided with a pressure control valve four and a one-way valve five; the pressure control valve four is electrically connected with the controller.

[0012] The low-pressure nitrogen gas outlet pipeline is communicated with the liquid nitrogen storage tank through a liquid nitrogen pressure supplementing pipeline, and the liquid nitrogen pressure supplementing pipeline is provided with a water bath heater and a liquid nitrogen gasifier;

[0013] The liquid nitrogen pressure supplementing pipeline is further provided with a pressure control valve five, a flow sensor five, a temperature control valve, a pressure sensor two and a one-way valve six, and the flow sensor five, the temperature control valve, the pressure sensor two and the pressure control valve five are electrically connected with the controller.

[0014] Preferably, the air inlets of the air compressor A, the air compressor B and the air compressor C are provided with filter screens.

[0015] Preferably, a filter two is arranged between the nitrogen buffer tank and the nitrogen storage tank.

[0016] Preferably, a safety valve two is arranged on the top of the nitrogen buffer tank.

[0017] Preferably, the industrial air buffer tank, the instrument air buffer tank, the dry air buffer tank, the nitrogen buffer tank and the nitrogen storage tank are all provided with blowdown pipelines.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. The common action of the air compressor B, the low-pressure pipeline network nitrogen gas and the liquid nitrogen storage tank nitrogen gas can timely cope with the failure of the instrument air system, and ensure the stability and reliability of the instrument air system.

[0020] 2) The air compressor B can realize mutual standby function with the air compressor A for the air supply system and the air compressor C for the nitrogen production system through the switching of the communication valve A (electric) and the communication valve B (electric), and the stability during system production and operation is increased.

[0021] 3) The nitrogen gas in the low-pressure pipeline network is integrated into the instrument air system, and the pressure control valve four on the low-pressure nitrogen gas outlet pipeline realizes automatic control with the instrument air pipeline network pressure, when the instrument air pipeline network pressure is lower than the set value of the pressure control valve four, the pressure control valve four is automatically opened, and the instrument air pipeline network pressure is supplemented and stabilized. Under normal circumstances, the instrument air pipeline network pressure is 0.75MPa, the low-pressure nitrogen gas pipeline network pressure is 0.7MPa, the pressure control valve four is always in the closed state, and in addition, the one-way valve five is arranged on the low-pressure nitrogen gas pressure supplementing pipeline, which can prevent the instrument air from entering the low-pressure nitrogen gas system.

[0022] 4) The nitrogen gas after the liquid nitrogen is gasified is incorporated into the low-pressure nitrogen gas pipe network, and the pressure control valve five at the bottom of the liquid nitrogen tank is automatically controlled by the low-pressure nitrogen gas pipe network pressure, when the low-pressure nitrogen gas pipe network pressure sensor four pressure is lower than the set value of the pressure control valve five, the pressure control valve five is automatically opened, and the low-pressure nitrogen gas pipe network is supplemented and stabilized in pressure. In addition, the hot water temperature control valve of the water bath heater and the nitrogen gas temperature at the outlet of the water bath heater are automatically controlled, when the liquid nitrogen gasification amount increases, the nitrogen gas temperature at the outlet of the water bath heater is lower than the set value, the temperature control valve is automatically opened, and the liquid nitrogen gasified nitrogen gas is heated.

[0023] 5) The pressure control valve is arranged at the top of the industrial air buffer tank, the instrument air buffer tank and the nitrogen gas storage tank, and the gas release can be automatically completed according to the system pressure, so that the system overpressure is prevented.

[0024] 6) The flow sensor is installed before the industrial air buffer tank, the instrument air buffer tank, the nitrogen gas storage tank and the nitrogen gas after the liquid nitrogen is gasified, so that the total gas consumption of the factory can be measured. The safety valve is installed at the top of the industrial air buffer tank, the instrument air buffer tank, the nitrogen gas buffer tank and the nitrogen gas storage tank, and the blowdown valve is installed at the bottom of the tank, so that the equipment can be protected, and the blowdown can be regularly performed.

[0025] 7) The nitrogen and oxygen are separated by the molecular sieve in the adsorption tank A and the adsorption tank B, and the adsorption and desorption of the adsorbent are controlled and switched by the program control system. The nitrogen gas buffer tank is buffered, so that the quality of the nitrogen gas is ensured, and the stability of the nitrogen gas pipe network is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is a structural schematic diagram of the utility model.

[0027] Fig. 2 It is a flow chart schematic diagram of the working process of the utility model.

[0028] In the figure, 1, air compressor A; 101, switch valve one; 102, check valve one; 2, air compressor B; 3, air compressor C; 301, switch valve three; 302, check valve three; 303, filter one; 4, water cooler; 5, industrial air buffer tank; 6, dryer; 7, instrument air buffer tank; 701, instrument air outlet pipeline; 702, instrument air pipeline network; 703, flow sensor one; 704, pressure sensor five; 705, safety valve one; 706, pressure sensor one; 707, check valve two; 708, vent pipeline two; 709, pressure control valve one; 8, dry air buffer tank; 801, dry air outlet pipeline; 802, control valve one; 901, adsorption tank A; 902, adsorption tank B; 903, adsorption tank connecting pipeline one; 904, adsorption tank connecting pipeline two; 905, control valve three; 906, control valve four; 907, control valve five; 908, control valve six; 909, control valve two; 910, vent pipeline one; 911, control valve eight; 10, nitrogen buffer tank; 11, instrument air filter; 12, air cooling dryer; 13, trace level filter; 14, submicron filter; 15, activated carbon filter; 16, adsorption tank A outlet pipeline; 1601, control valve seven; 17, nitrogen storage tank; 1701, low-pressure nitrogen outlet pipeline; 1702, low-pressure nitrogen vent pipeline; 1703, safety valve two; 1704, pressure sensor three; 1705, pressure control valve three; 1706, check valve four; 1707, flow sensor four; 1708, pressure sensor four; 18, low-pressure nitrogen pipeline network; 19, low-pressure nitrogen pressure supplement pipeline; 1901, pressure control valve four; 1902, check valve five; 20, liquid nitrogen pressure supplement pipeline; 2001, pressure control valve five; 2002, flow sensor five; 2003, temperature control valve; 2004, pressure sensor two; 2005, check valve six; 21, liquid nitrogen storage tank; 22, water bath heater; 23, liquid nitrogen vaporizer; 24, filter two; 25, filter screen; 26, blowdown pipeline. DETAILED DESCRIPTION

[0029] In order to enable personnel in the technical field to better understand the technical solutions in the utility model, the technical solutions in the utility model embodiments will be clearly and completely described below in combination with the drawings in the utility model embodiments.

[0030] Embodiment 1

[0031] As Figs. 1-2As shown, the embodiment provides an emergency pressure compensation system for factory instrument air sudden interruption, which comprises an air compressor A1, an air compressor B2 and an air compressor C3 arranged in parallel with the air compressor A1, a water cooler 4, an industrial air buffer tank 5, a dryer 6, an instrument air buffer tank 7, a dry air buffer tank 8, an adsorption tank, a nitrogen buffer tank 10 and a controller; the air compressor A1, the air compressor B2 and the air compressor C3 are communicated through pipelines, and the pipelines communicating with each other of the air compressor A1, the air compressor B2 and the air compressor C3 are provided with communication valves;

[0032] The adsorption tank comprises an adsorption tank A901 and an adsorption tank B902 arranged in parallel, and the adsorption tank A901 and the adsorption tank B902 are provided with an adsorption tank connecting pipeline one 903 and an adsorption tank connecting pipeline two 904; the adsorption tank connecting pipeline one 903 is provided with a control valve three 905 and a control valve four 906, the adsorption tank connecting pipeline two 904 is provided with a control valve five 907 and a control valve six 908, the adsorption tank B902 is communicated with the dry air buffer tank 8 through a pipeline, the pipeline connecting the adsorption tank B902 and the dry air buffer tank 8 is provided with a control valve two 909, and the adsorption tank connecting pipeline one 903 is connected with a venting pipeline one 910 provided with a control valve eight 911;

[0033] The air compressor A1 is connected with the water cooler 4 through a pipeline, the compressed air outlet of the water cooler 4 is provided with two pipelines, one of which is connected with the industrial air buffer tank 5, and the other of which is connected with the dryer 6 and the instrument air buffer tank 7 in sequence, and the instrument air buffer tank 7 is connected with an instrument air pipeline network 702 through an instrument air outlet pipeline 701; the instrument air outlet pipeline 701 is provided with a one-way valve two 707, a flow sensor one 703 and a pressure sensor five 704, and the pipeline between the air compressor A1 and the water cooler 4 is provided with an on-off valve one 101 and a one-way valve one 102; the pipeline between the dryer 6 and the instrument air buffer tank 7 is provided with an instrument air filter 11; the flow sensor one 703 and the pressure sensor five 704 are electrically connected with the controller;

[0034] The air compressor C3 is connected with an air cooling dryer 12 through a pipeline, and the pipeline between the air compressor C3 and the air cooling dryer 12 is provided with an on-off valve three 301, a one-way valve three 302 and a filter one 303; the air cooling dryer 12 is connected with a micro-level filter 13, a submicron filter 14, an activated carbon filter 15 and the dry air buffer tank 8 in sequence through a pipeline; the dry air buffer tank 8 is provided with a dry air outlet pipeline 801 connected with the adsorption tank A901, and the dry air outlet pipeline 801 is provided with a control valve one 802; the adsorption tank A901 is connected with the nitrogen buffer tank 10 through an adsorption tank A outlet pipeline 16 provided with a control valve five 907, a control valve seven 1601 and a one-way valve;

[0035] The safety valve 705 and the pressure sensor 706 are arranged on the top of the instrument air buffer tank 7, the instrument air outlet pipeline 701 is also connected with the vent pipeline 708, the vent pipeline 708 is provided with the pressure control valve 709, and the pressure control valve 709 and the pressure sensor 706 are electrically connected with the controller;

[0036] The nitrogen buffer tank 10 is connected with the nitrogen storage tank 17 through a pipeline, the low-pressure nitrogen outlet pipeline 1701 and the low-pressure nitrogen vent pipeline 1702, the safety valve 1703 and the pressure sensor 1704 are arranged on the top of the nitrogen storage tank 17, the low-pressure nitrogen vent pipeline 1702 is provided with the pressure control valve 1705, the pressure sensor 1704 and the pressure control valve 1705 are electrically connected with the controller, the low-pressure nitrogen outlet pipeline 1701 is connected with the low-pressure nitrogen pipeline network 18, and the low-pressure nitrogen outlet pipeline 1701 is provided with the one-way valve 1706, the flow sensor 1707 and the pressure sensor 1708, and the flow sensor 1707 and the pressure sensor 1708 are electrically connected with the controller;

[0037] The low-pressure nitrogen outlet pipeline 1701 communicates with the instrument air outlet pipeline 701 through the low-pressure nitrogen pressure compensation pipeline 19, and the low-pressure nitrogen pressure compensation pipeline 19 is provided with the pressure control valve 1901 and the one-way valve 1902, and the pressure control valve 1901 is electrically connected with the controller;

[0038] The low-pressure nitrogen outlet pipeline 1701 communicates with the liquid nitrogen storage tank 21 through the liquid nitrogen pressure compensation pipeline 20, and the liquid nitrogen pressure compensation pipeline 20 is provided with the water bath heater 22 and the liquid nitrogen gasifier 23.

[0039] The liquid nitrogen pressure compensation pipeline 20 is also provided with the pressure control valve 2001, the flow sensor 2002, the temperature control valve 2003, the pressure sensor 2004 and the one-way valve 2005, and the flow sensor 2002, the temperature control valve 2003, the pressure sensor 2004 and the pressure control valve 2001 are electrically connected with the controller.

[0040] The air inlet of the air compressor A1, the air compressor B2 and the air compressor C3 is provided with the filter screen 25.

[0041] The filter 24 is arranged between the nitrogen buffer tank 10 and the nitrogen storage tank 17.

[0042] The safety valve 1703 is arranged on the top of the nitrogen buffer tank 10.

[0043] The industrial air buffer tank 5, the instrument air buffer tank 7, the dry air buffer tank 8, the nitrogen buffer tank 10 and the nitrogen storage tank 17 are all provided with the blowdown pipeline 26.

[0044] Working process: under normal circumstances, the ambient air through the unit inlet filter 25 is sucked into the air compressor A1, and after being compressed to 0.75 MPa by the air compressor A1, it enters the water cooler 4 through the air compressor outlet switch valve one 101 and the check valve one 102 for cooling. The cooled compressed air enters the industrial air buffer tank 5 to provide air source for the industrial air pipe network, and the other enters the dryer 6 for oil removal, dehydration and drying treatment, and then enters the instrument air filter 11. The dryer 6 includes dryers A and B for mutual backup. The filtered and impurity-removed compressed air enters the instrument air buffer tank 7, and then is sent to the instrument air pipe network 702 from the instrument air buffer tank 7, and finally is supplied to the downstream gas using devices. In order to prevent the instrument air system from overpressure, a safety valve one 705 is arranged at the top of the instrument air buffer tank 7, and a pressure control valve one 709 is arranged in the vent line two 708. The pressure control valve one 709 is electrically connected with the instrument air buffer tank 7 tank top pressure sensor one 706. Once the pressure of the instrument air pipe network 702 exceeds the set value, the pressure control valve one 709 is automatically opened, and after completing the pipe network pressure relief, the pressure control valve one 709 is closed.

[0045] The ambient air is sucked into the air compressor C3 through the filter screen 25 at the air compressor inlet, compressed to 0.7 MPa by the air compressor C3, and then enters the air cooling and drying machine 12 through the air compressor outlet on-off valve three 301, the one-way valve three 302, and the filter one 303. The compressed air then sequentially passes through the trace-level filter 13, the sub-micron filter 14, and the activated carbon filter 15 for three-stage filtration, and enters the dry air buffer tank 8. The dried compressed air enters the adsorption tank A901 for adsorption and oxygen removal through the control valve one 802. When the pressure in the adsorption tank A901 rises from 0 MPa to 0.7 MPa, the control valve five 907 and the control valve seven 1601 are opened. The qualified nitrogen gas after oxygen removal flows out from the top of the adsorption tank A901, enters the nitrogen gas buffer tank 10 through the control valve five 907, the control valve seven 1601, and the outlet one-way valve, and the control valve four 906 connected to the adsorption tank B902 is opened at this time. The control valve eight 911 is also opened, and the oxygen in the adsorption tank B902 is discharged to the external environment through the control valve four 906 and the control valve eight 911. When the internal pressure of the adsorption tank B902 decreases to 0 MPa, the control valve three 905 and the control valve six 908 are opened, and the control valve one 802, the control valve seven 1601, and the control valve eight 911 are closed. At this time, the nitrogen gas in the adsorption tank A901 enters the adsorption tank B902, the pressure in the adsorption tank A901 decreases from 0.7 MPa to 0.35 MPa, and the pressure in the adsorption tank B902 rises from 0 MPa to 0.35 MPa. The adsorption tank A901 and the adsorption tank B902 complete the system pressure equalization. At this time, the control valve two 909 and the control valve seven 1601 are opened, the control valve four 906 and the control valve five 907 are closed, the compressed air from the dry air buffer tank 8 enters the adsorption tank B902 through the control valve two 909, and when the pressure in the adsorption tank B902 rises to 0.7 MPa, the qualified nitrogen gas in the adsorption tank B902 enters the nitrogen gas buffer tank 10 through the control valve seven 1601. At the same time, the control valve eight 911 is opened, the oxygen in the adsorption tank A901 is discharged to the external environment through the control valve three 905 and the control valve eight 911, and the adsorbent in the adsorption tank A901 is also regenerated. When the pressure in the adsorption tank A901 decreases from 0.35 MPa to 0 MPa, the control valve two 909, the control valve seven 1601, and the control valve eight 911 are closed, the control valve four 906 and the control valve five 907 are opened, and the nitrogen gas in the adsorption tank B902 enters the adsorption tank A901 at this time. The pressure in the adsorption tank B902 decreases from 0.7 MPa to 0.35 MPa, and the pressure in the adsorption tank A901 rises from 0 MPa to 0.35 MPa. The adsorption tank B902 and the adsorption tank A901 complete the system pressure equalization. The adsorption tank A and the adsorption tank B alternate adsorption and desorption to ensure the purity of the nitrogen gas. The nitrogen gas first enters the nitrogen gas buffer tank 10, and then enters the nitrogen gas storage tank 17 from the nitrogen gas buffer tank 10 to ensure the stability of the pressure in the low-pressure nitrogen gas pipe network 18. The filter two 24 is arranged between the nitrogen gas buffer tank 10 and the nitrogen gas storage tank 17 to ensure the cleanliness of the nitrogen gas.To prevent overpressure in the low-pressure nitrogen system, safety valves are installed at the top of the nitrogen buffer tank 10 and the nitrogen storage tank 17, respectively. A pressure control valve 3 1705 is installed on the outlet pipeline at the top of the nitrogen storage tank 17. After the pressure control valve 3 1705, there is a low-pressure nitrogen venting pipeline 1702. The pressure control valve 3 1705 is electrically connected to the pressure sensor 3 1704 at the top of the nitrogen storage tank 17. Once the pressure of the low-pressure nitrogen pipeline 18 exceeds the set value, the pressure control valve 3 1705 will automatically open and close after the pipeline pressure is released. The low-pressure nitrogen outlet pipeline is equipped with a one-way valve 41706, a flow sensor 41707, and a pressure sensor 41708. The pressure sensor 41708 is electrically connected to the pressure control valve 52001 at the bottom outlet of the liquid nitrogen storage tank 21. Nitrogen in the low-pressure nitrogen pipeline network 18 is sent to downstream gas-using devices through the pipeline to meet their gas needs for system purging and replacement, dry gas sealing of large units, nitrogen sealing protection of equipment and instruments, and nitrogen sealing of raw material and product storage tanks.

[0046] In addition, the liquid nitrogen in the liquid nitrogen storage tank 21 enters the liquid nitrogen vaporizer 23 through the bottom pressure control valve 2001 and is vaporized into nitrogen gas. Then, it is heated to the required operating temperature by hot water from the pipeline through the water bath heater 22. A thermometer is installed on the nitrogen line at the outlet of the water bath heater 22, and this thermometer is electrically connected to the temperature control valve 2003 that controls the flow into the water bath heater 22. The heated nitrogen gas passes through the flow sensor 2002 and the check valve before finally being connected to the low-pressure nitrogen pipeline 18. The bottom outlet pressure control valve 2001 of the liquid nitrogen storage tank 21 is electrically connected to the low-pressure nitrogen pipeline pressure sensor 1708.

[0047] The low-pressure nitrogen pipeline 18 is connected to the instrument air pipeline 702 through pressure control valve 4 1901 and check valve 5 1902, wherein the pressure control valve 4 1901 is electrically connected to the pressure sensor 5 704 of the instrument air pipeline.

[0048] In special circumstances, such as when the air compressor A1 of the instrument air system suddenly fails and stops operating under operating conditions 1, the pressure of the instrument air duct network 702 begins to drop. When the pressure of the instrument air buffer tank 7 drops to 0.65MPa (the normal operating pressure of the instrument air buffer tank 7 is 0.75MPa), the standby air compressor B2 will automatically restart, the switch valve 101 at the outlet of air compressor A1 will be interlocked closed, the switch valve 2 at the outlet of air compressor B2 will be interlocked open, and the connecting valve between air compressor A and air compressor B will be interlocked open. The pressure of the instrument air duct network will tend to stabilize and slowly recover to the pressure before shutdown.

[0049] In operating condition 2, when the standby air compressor B2 fails to start automatically and the pressure of the instrument air duct 702 drops to 0.55MPa, the 0.65MPa low-pressure nitrogen produced by the nitrogen generator unit begins to be incorporated into the instrument air system to maintain the duct pressure. During this period, in order to ensure the stability of the low-pressure nitrogen duct pressure, the amount of liquid nitrogen vaporization is controlled by the pressure control valve at the bottom of the liquid nitrogen storage tank to achieve nitrogen duct pressure control.

[0050] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and all such modifications or substitutions should be within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An emergency pressurization system for sudden interruption of instrument air supply in a factory, characterized in that, It includes air compressor A (1), air compressor B (2) and air compressor C (3) arranged in parallel with air compressor A (1), water cooler (4), industrial air buffer tank (5), dryer (6), instrument air buffer tank (7), dry air buffer tank (8), adsorption tank, nitrogen buffer tank (10) and controller; air compressor A (1), air compressor B (2) and air compressor C (3) are connected by pipelines, and the pipelines connecting air compressor A (1), air compressor B (2) and air compressor C (3) are equipped with connecting valves; The adsorption tank includes an adsorption tank A (901) and an adsorption tank B (902) arranged in parallel. An adsorption tank connecting pipe 1 (903) and an adsorption tank connecting pipe 2 (904) are provided between adsorption tank A (901) and adsorption tank B (902). An adsorption tank connecting pipe 1 (903) is equipped with a control valve 3 (905) and a control valve 4 (906). An adsorption tank connecting pipe 2 (904) is equipped with a control valve 5 (907) and a control valve 6 (908). Adsorption tank B (902) is connected to a dry air buffer tank (8) through a pipe. An adsorption tank B (902) and a dry air buffer tank (8) are connected to a control valve 2 (909). An adsorption tank connecting pipe 1 (903) is connected to an venting pipe 1 (910). An venting pipe 1 (910) is equipped with a control valve 8 (911). Air compressor A (1) is connected to water cooler (4) via a pipeline. The compressed air outlet of water cooler (4) is provided with two pipelines. One pipeline is connected to industrial air buffer tank (5), and the other pipeline is connected to dryer (6) and instrument air buffer tank (7) in sequence. Instrument air buffer tank (7) is connected to instrument air network (702) via instrument air outlet pipeline (701). Instrument air outlet pipeline (701) is provided with check valve 2 (707), flow sensor 1 (703) and pressure sensor 5 (704). The pipeline between air compressor A (1) and water cooler (4) is provided with switch valve 1 (101) and check valve 1 (102). The pipeline between dryer (6) and instrument air buffer tank (7) is provided with instrument air filter (11). Flow sensor 1 (703) and pressure sensor 5 (704) are both electrically connected to the controller. Air compressor C (3) is connected to air-cooled dryer (12) through pipeline. The pipeline between air compressor C (3) and air-cooled dryer (12) is equipped with switch valve three (301), check valve three (302) and filter one (303). Air-cooled dryer (12) is connected to micro-level filter (13), submicron filter (14), activated carbon filter (15) and dry air buffer tank (8) in sequence through pipeline. Dry air buffer tank (8) is equipped with dry air outlet pipeline (801). Dry air outlet pipeline (801) is connected to adsorption tank A (901). Dry air outlet pipeline (801) is equipped with control valve one (802). Adsorption tank A (901) is connected to nitrogen buffer tank (10) through adsorption tank A outlet pipeline (16). Adsorption tank A outlet pipeline (16) is equipped with control valve five (907), control valve seven (1601) and check valve. Safety valve 1 (705) and pressure sensor 1 (706) are installed on the top of the instrument air buffer tank (7). The instrument air outlet pipe (701) is also connected to vent pipe 2 (708). Vent pipe 2 (708) is equipped with pressure control valve 1 (709). Pressure control valve 1 (709) and pressure sensor 1 (706) are both electrically connected to the control valve. The nitrogen buffer tank (10) is connected to the nitrogen storage tank (17) through a pipeline. The nitrogen storage tank (17) is equipped with a low-pressure nitrogen outlet pipeline (1701) and a low-pressure nitrogen vent pipeline (1702), a safety valve (1703) and a pressure sensor (1704) at the top. The low-pressure nitrogen vent pipeline (1702) is equipped with a pressure control valve (1705). The pressure sensor (1704) and the pressure control valve (1705) are both electrically connected to the controller. The low-pressure nitrogen outlet pipeline (1701) is connected to the low-pressure nitrogen pipeline network (18). The low-pressure nitrogen outlet pipeline (1701) is equipped with a check valve (1706), a flow sensor (1707) and a pressure sensor (1708). The flow sensor (1707) and the pressure sensor (1708) are electrically connected to the controller. The low-pressure nitrogen outlet pipeline (1701) is connected to the instrument air outlet pipeline (701) through the low-pressure nitrogen replenishment pipeline (19). The low-pressure nitrogen replenishment pipeline (19) is equipped with a pressure control valve four (1901) and a check valve five (1902). The pressure control valve four (1901) is electrically connected to the controller. The low-pressure nitrogen outlet pipeline (1701) is connected to the liquid nitrogen storage tank (21) through the liquid nitrogen pressurization pipeline (20). The liquid nitrogen pressurization pipeline (20) is equipped with a water bath heater (22) and a liquid nitrogen vaporizer (23). The liquid nitrogen pressurization pipeline (20) is also equipped with pressure control valve five (2001), flow sensor five (2002), temperature control valve (2003), pressure sensor two (2004) and check valve six (2005). Flow sensor five (2002), temperature control valve (2003), pressure sensor two (2004) and pressure control valve five (2001) are all electrically connected to the controller.

2. The emergency pressurization system for sudden interruption of instrument air supply in a factory as described in claim 1, characterized in that, Air compressors A (1), B (2) and C (3) are all equipped with filters (25) at their air inlets.

3. The emergency pressurization system for sudden interruption of instrument air supply in a factory as described in claim 1, characterized in that, A filter 2 (24) is installed between the nitrogen buffer tank (10) and the nitrogen storage tank (17).

4. The emergency pressurization system for sudden interruption of instrument air supply in a factory as described in claim 1, characterized in that, Safety valve 2 is installed on the top of the nitrogen buffer tank (10).

5. The emergency pressurization system for sudden interruption of instrument air supply in a factory as described in claim 1, characterized in that, Industrial air buffer tank (5), instrument air buffer tank (7), dry air buffer tank (8), nitrogen buffer tank (10) and nitrogen storage tank (17) are all equipped with sewage discharge pipes (26).

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