Device for preventing pipe explosion of circulating water pipeline of reciprocating compressor

Abstract

The utility model discloses a device for preventing a circulating water pipeline of a reciprocating compressor from being exploded. The device comprises a safety valve group, a safety emptying liquid separation tank, a torch and an external discharge guide spraying pipeline, circulating water outlets of all circulating water heat exchangers in the methanol synthesis flash steam recycling system are connected with the input end of a safety emptying liquid separation tank through corresponding safety valve groups, the output end of the top of the safety emptying liquid separation tank is connected with a torch, and the output end of the bottom of the safety emptying liquid separation tank is connected with a discharge guide spraying pipeline. The device has the advantages that when the cylinder body of the flash press or the circulating water heat exchanger leaks, a leaked mixture of flash steam and circulating water enters the safety emptying liquid separation tank through the safety valve group, so that gas-liquid separation is realized, an overpressure pipe explosion event is avoided, and the safety production coefficient of a system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical reciprocating compressors, in particular to a device for preventing a circulating water pipeline of a reciprocating compressor from bursting. Background Art

[0002] Reciprocating compressors are widely used and are suitable for low, medium and high pressure gas compression. They can be widely used in industry, agriculture, medicine, chemical industry and other fields. Figure 1 As shown, in the methanol synthesis flash gas recovery and reuse system, the low-temperature methanol washing station processes the conversion gas from the conversion, firstly precools the conversion gas through the heat exchanger 1, and the precooled conversion gas enters the methanol washing tower through the converter into the washing tower valve, the washed purified gas is first heated by the heat exchanger 2, and then heated by the heat exchanger 1, and the qualified purified gas is sent to the synthesis through the external purified gas valve group, the methanol in the middle of the methanol washing tower is first flashed in the flash tank 1, and then flashed in the flash tank 2, and the liquid phase is sent to the solution through the flash tank The gas enters the carbon dioxide desorption tower through valve 1 of the desorption tower. The methanol in the lower part of the methanol washing tower is first flashed through flash tank 3 and then flashed through flash tank 4. The liquid phase enters the carbon dioxide desorption tower through valve 2 of the flash tank. The first-stage flash tank (1, 3) flashes out qualified flash gas (1.6Mpa) and the second-stage flash tank (2, 4) flashes out qualified flash gas (0.8Mpa) and passes through the flash compressor (compressor) ABCD to increase the pressure (6.8Mpa). After compression, the high-pressure flash gas passes through the circulating water heat exchanger (such as Figure 2 The flash steam after cooling passes through the flash steam inlet system valve to be sent into the conversion gas pipeline for reuse.

[0003] The function of the reciprocating compressor (flash compressor) in the methanol synthesis flash gas recovery and reuse system is to do work on the qualified flash gas after flash treatment, so as to increase the pressure of the flash gas. A circulating water cooling system (circulating water heat exchanger) is arranged on the outside of the cylinder body and between the cylinders where the gas pressure increases. If the compressor cylinder body or the circulating water heat exchanger leaks, the high-pressure flash gas will leak into the low-pressure circulating water pipeline, and the circulating water pipeline may burst, which will not only affect the recovery and utilization of the flash gas and cause the system to fail to work normally, but also cause production safety accidents. Utility Model Content

[0004] The utility model aims to provide a device for preventing the circulating water pipeline of a reciprocating compressor from bursting, thereby solving the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A device for preventing a circulating water pipeline of a reciprocating compressor from bursting comprises a safety valve group, a safety venting liquid separator tank, a flare and an external drainage drain pipe; the circulating water outlets of various circulating water heat exchangers in a methanol synthesis flash gas recovery and reuse system are respectively connected to the input end of the safety venting liquid separator tank via corresponding safety valve groups, the top output end of the safety venting liquid separator tank is connected to the flare, and the bottom output end of the safety venting liquid separator tank is connected to the external drainage drain pipe.

[0007] Preferably, the safety valve group includes a stop valve before the safety valve, a circulating water main pipe safety valve and a stop valve after the safety valve, which are sequentially arranged at intervals on the connecting pipeline between the circulating water outlet and the safety venting separator tank.

[0008] Preferably, a circulating water pipe is connected to the circulating water outlet of the circulating water heat exchanger, and the circulating water pipe is connected to the safety venting liquid separation tank via a converging main pipe;

[0009] The stop valve before the safety valve, the safety valve of the circulating water main pipe and the stop valve after the safety valve are arranged on the circulating water pipeline in sequence and at intervals along the flow direction of the liquid inside the pipeline.

[0010] Preferably, the confluence main pipe is provided with a safety valve for venting into a safety venting main valve of the liquid separation tank.

[0011] Preferably, a liquid level gauge, a pressure gauge and a thermometer are provided inside the safety venting liquid separator tank.

[0012] Preferably, the external drainage and shower pipe is connected to an external delivery pipe, and the external delivery pipe is connected to a sewage treatment and recycling system; an external delivery wastewater pump and an external delivery wastewater regulating valve group are sequentially arranged on the external delivery pipe along the internal liquid flow direction.

[0013] The beneficial effect of the utility model is that when a flash compressor cylinder or a circulating water heat exchanger leaks, the leaked flash gas and circulating water mixture enters the safe venting liquid separator tank through the safety valve group, thereby achieving gas-liquid separation, avoiding overpressure pipe bursting events, and improving the system's safety production coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the structural diagram of the methanol synthesis flash gas recovery and reuse system;

[0015] Figure 2 It is the structural diagram of the circulating water heat exchanger;

[0016] Figure 3 It is a structural diagram of the device in the embodiment of the utility model; DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0018] like Figure 3 As shown, in this embodiment, a device for preventing the reciprocating compressor circulating water pipeline from bursting is provided, including a safety valve group, a safety venting liquid separator tank, a flare and an external drainage pipeline; each circulating water heat exchanger in the methanol synthesis flash gas recovery and reuse system (see attached Figure 2 The circulating water heat exchanger includes a circulating water inlet, a circulating water outlet, a high-pressure flash steam inlet and a high-pressure flash steam outlet, and the circulating water outlet is respectively connected to the input end of the safety venting separator tank through the corresponding safety valve group, the top output end of the safety venting separator tank is connected to the torch, and the bottom output end of the safety venting separator tank is connected to an external drainage guide pipe.

[0019] In this embodiment, the safety valve group includes a stop valve before the safety valve, a circulating water main pipe safety valve and a stop valve after the safety valve, which are sequentially arranged at intervals on the connecting pipeline between the circulating water outlet and the safety venting separator tank.

[0020] Specifically: a circulating water pipe is connected to the circulating water outlet of the circulating water heat exchanger, and the circulating water pipe is connected to the safety venting separation tank through a converging main pipe;

[0021] The stop valve before the safety valve, the safety valve of the circulating water main pipe and the stop valve after the safety valve are arranged on the circulating water pipeline in sequence along the flow direction of the liquid inside the pipeline. The main valve for venting the safety valve into the safety venting liquid separation tank is arranged on the converging main pipe.

[0022] In this embodiment, a liquid level gauge, a pressure gauge and a thermometer are arranged inside the safety venting liquid separator tank to monitor the medium state inside the safety venting liquid separator tank in real time.

[0023] In this embodiment, an external delivery pipe is connected to the external drainage and shower pipe, and the external delivery pipe is connected to the sewage treatment and recycling system; an external delivery wastewater pump and an external delivery wastewater regulating valve group are arranged in sequence on the external delivery pipe along the internal liquid flow direction.

[0024] In this embodiment, see the attached Figure 3The circulating water outlet of the circulating water heat exchanger of the flash compressor ABCD in the methanol synthesis flash gas recovery and reuse system is connected to the safety venting separator tank through a circulating water pipeline and a confluence main pipe, and a safety valve group is set on the circulating water pipeline (the safety valve of the circulating water main pipe is in a normally closed state, and the stop valve before the safety valve and the stop valve after the safety valve are manual stop valves, which are in a normally open state), and a safety valve venting into the safety venting separator tank main valve (a manual stop valve, which is in a normally open state) is set on the confluence main pipe.

[0025] In the methanol synthesis flash gas recovery and reuse system, the low-temperature methanol washing station processes the conversion gas from the conversion, first pre-cools the conversion gas through heat exchanger 1, and the pre-cooled conversion gas enters the methanol washing tower through the converter inlet valve. The purified gas after washing is first heated by heat exchanger 2, and then heated by heat exchanger 1. The qualified purified gas is sent to the synthesis through the external purified gas valve group. The methanol in the middle of the methanol washing tower is first flashed in flash tank 1, and then flashed in flash tank 2. The liquid phase enters the carbon dioxide decomposition tower through the flash tank inlet valve 1. The methanol at the bottom of the methanol washing tower is first flashed in flash tank 3, and then flashed in flash tank 4. The liquid phase enters the carbon dioxide decomposition tower through the flash tank inlet valve 2. The first flash tank (1, 3) flashes out qualified flash steam (1.6Mpa) and the second flash tank (2, 4) flashes out qualified flash steam (0.8Mpa) which are pressurized (6.8Mpa) by the flash compressor (compressor) ABCD. After compression, the high-pressure flash steam is cooled by the circulating water heat exchanger. The cooled flash steam is sent to the conversion gas pipeline for reuse through the flash steam inlet system valve. When the circulating water heat exchanger has internal leakage, the circulating water main pipe safety valve is tripped, and the flash steam and circulating water are vented into the safety venting liquid separator tank main valve through the safety valve and enter the inside of the safety venting liquid separator tank. The gas phase flash steam enters the torch through the top output end of the safety venting liquid separator tank. The liquid phase circulating water can be discharged to the on-site ditch through the shower pipe, or sent to the sewage treatment system for recycling through the external wastewater pump and the external wastewater regulating valve group.

[0026] By adopting the above technical solution disclosed in the utility model, the following beneficial effects are obtained:

[0027] The utility model provides a device for preventing the circulating water pipeline of a reciprocating compressor from bursting. When a flash compressor cylinder or a circulating water heat exchanger leaks, the leaked flash gas and circulating water mixture enters a safe venting liquid separator tank through a safety valve group, thereby achieving gas-liquid separation, avoiding the occurrence of overpressure pipe bursting events, and improving the system's safety production coefficient.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A device for preventing the bursting of circulating water pipes of reciprocating compressors, characterized in that: It includes a safety valve group, a safety venting separator tank, a flare and an external drain pipe; the circulating water outlets of each circulating water heat exchanger in the methanol synthesis flash gas recovery and reuse system are connected to the input end of the safety venting separator tank through the corresponding safety valve group, the top output end of the safety venting separator tank is connected to the flare, and the bottom output end of the safety venting separator tank is connected to the external drain pipe.

2. The device for preventing the reciprocating compressor circulating water pipeline from bursting according to claim 1 is characterized in that: The safety valve group comprises a stop valve before the safety valve, a safety valve of the circulating water main pipe and a stop valve after the safety valve, which are sequentially arranged at intervals on the connecting pipeline between the circulating water outlet and the safety venting liquid separator tank.

3. The device for preventing the reciprocating compressor circulating water pipeline from bursting according to claim 2 is characterized in that: The circulating water outlet of the circulating water heat exchanger is connected to a circulating water pipeline, and the circulating water pipeline is connected to the safety venting liquid separation tank through a converging main pipe; The stop valve before the safety valve, the safety valve of the circulating water main pipe and the stop valve after the safety valve are arranged on the circulating water pipeline in sequence and at intervals along the flow direction of the liquid inside the pipeline.

4. The device for preventing the reciprocating compressor circulating water pipeline from bursting according to claim 3 is characterized in that: The confluence main pipe is provided with a safety valve for venting into a main valve of a safety venting liquid separation tank.

5. The device for preventing the reciprocating compressor circulating water pipeline from bursting according to claim 1 is characterized in that: The safe venting liquid separator tank is provided with a liquid level gauge, a pressure gauge and a thermometer.

6. The device for preventing the reciprocating compressor circulating water pipeline from bursting according to claim 1, characterized in that: The external drainage and shower pipe is connected to an external delivery pipe, and the external delivery pipe is connected to a sewage treatment and recycling system; an external delivery wastewater pump and an external delivery wastewater regulating valve group are sequentially arranged on the external delivery pipe along the internal liquid flow direction.

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