CN216742837U - Cryogenic pump seal gas control system - Google Patents
Cryogenic pump seal gas control system Download PDFInfo
- Publication number
- CN216742837U CN216742837U CN202123010222.6U CN202123010222U CN216742837U CN 216742837 U CN216742837 U CN 216742837U CN 202123010222 U CN202123010222 U CN 202123010222U CN 216742837 U CN216742837 U CN 216742837U
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- China
- Prior art keywords
- pump
- return circuit
- liquid
- expander
- reserve
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- 239000007788 liquid Substances 0.000 claims abstract description 87
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 82
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000007789 gas Substances 0.000 claims abstract description 69
- 229910052786 argon Inorganic materials 0.000 claims abstract description 41
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 33
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 27
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000006200 vaporizer Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 5
- 238000007906 compression Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 13
- 238000000926 separation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 210000003027 Ear, Inner Anatomy 0.000 description 1
- 210000003128 Head Anatomy 0.000 description 1
- 210000003437 Trachea Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000001050 lubricating Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000001706 oxygenating Effects 0.000 description 1
Images
Abstract
The utility model relates to a cryogenic pump seals gas control technical field in the interior compression system oxygen system, in particular to cryogenic pump seals gas control system. Its structure includes liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit, and liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit are parallelly connected each other through reserve sealed gas pipeline, reserve sealed gas pipeline connect the liquid nitrogen pump foremost for provide 1.0Mpa nitrogen gas, reserve sealed gas pipeline front portion set up the master valve, reserve sealed gas pipeline and liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit between be connected the pipeline on be provided with branch valve, reserve sealed gas pipeline front end still be connected with 0.4Mpa reserve nitrogen gas circuit. The utility model discloses a cryogenic pump seals gas control system has solved the safe operation problem of the important cryogenic pump in system emergency shutdown back, especially can stabilize the supply nitrogen gas in succession after the total system has a power failure, can guarantee simultaneously that the cryogenic pump is in stand-by state, shortens the time that the system was driven again.
Description
Technical Field
The utility model relates to a cryogenic pump seals gas control technical field in the interior compression system oxygen system, in particular to cryogenic pump seals gas control system.
Background
An air separation plant in the prior art, such as a 28000 internal compression process designed by air separation plant ltd in Sichuan, takes a cold box as the core of the air separation plant, and important devices, such as a low-temperature liquid oxygen pump, a liquid argon pump, an expansion machine and the like, are distributed around the cold box. The low-temperature liquid oxygen pump sealed air source is air at the first-stage outlet of the air compressor booster unit, the liquid argon pump sealed air source is low-pressure nitrogen produced by the lower tower of the rectifying tower, and the expander sealed air source is air at the second-stage outlet of the air compressor booster unit.
The production system has the emergency stop condition (power failure, chain triggering of sudden closing of an important valve) for many times during operation, after the emergency stop, the sealing effect is failed due to instant interruption of sealing gas of important equipment, a large amount of low-temperature argon gas at the shaft seal of the liquid argon pump leaks, the temperature of a bearing of an expander is rapidly reduced to a low report value, liquid oxygen in a pump body of the liquid oxygen pump leaks along labyrinth seal, oxygen leaks, even the contact of the oxygen and lubricating grease of a front bearing of a motor is caused to cause safety accidents, meanwhile, external wet air easily enters the seal to cause blockage of a sealing gas flow path, the safe operation of the important equipment (the liquid oxygen pump, the liquid argon pump and the expander) is seriously influenced, and meanwhile, due to the change of field environment, the risk is high, and safety events are easily caused.
Disclosure of Invention
In order to solve the problem of the prior art, the utility model provides a cryogenic pump seals gas control system, it is through to important cryogenic pump (liquid oxygen pump) around the cold box, liquid argon pump, the expander) increase two reserve sealed air supplies (liquid nitrogen pump export 1.0MPa clean nitrogen gas and liquid nitrogen vaporizer 0.4MPa clean nitrogen gas), thereby solve the safe operation problem of the important cryogenic pump after the system emergency shutdown, especially the complete system drops into from liquid nitrogen vaporizer 0.4MPa clean nitrogen gas can stably supply nitrogen gas in succession after having a power failure, can guarantee simultaneously that the cryogenic pump is in standby state, shorten the time that the system restarted.
The utility model discloses the technical scheme who adopts as follows:
the utility model provides a cryopump seal gas control system, includes liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit, and liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit are parallelly connected each other through reserve sealed gas pipeline, reserve sealed gas pipeline connect the liquid nitrogen pump foremost for provide 1.0Mpa nitrogen gas, reserve sealed gas pipeline front portion set up the main valve, reserve sealed gas pipeline and liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit between be connected the pipeline on be provided with the branch valve, reserve sealed gas pipeline front end still be connected with 0.4Mpa reserve nitrogen gas circuit.
Preferably, the spare sealed gas line is provided with a first stop valve at the front.
Preferably, the 0.4Mpa spare nitrogen gas path comprises a liquid nitrogen storage tank, and the liquid nitrogen storage tank is connected with the front end of the spare sealed gas pipeline through a vaporizer and a pipeline with a second stop valve and a control valve.
Preferably, liquid argon pump return circuit includes first liquid argon pump and second liquid argon pump, first liquid argon pump and second liquid argon pump connect after connecting in parallel reserve sealed gas line, just pipeline intercommunication rectifying column between first liquid argon pump and the second liquid argon pump 0.4Mpa nitrogen gas output pipeline of tower down.
Preferably, the expander loop comprises a first expander and a second expander which are connected in parallel, the first expander and the second expander are respectively connected with the standby sealed gas pipeline, and the first expander and the second expander are further connected with a clean air input pipeline of the second booster section through pipelines.
The outlet of the liquid nitrogen pump is provided with a 1.0MPa gas source, and a phi 14 stainless steel pipe is led to be branched to the oxygen pump, the argon pump and the expansion machine sealing gas pipeline from the pipeline control valve, and a main valve and a branch valve are arranged to realize branch condition control. Meanwhile, one path of 0.4MPa nitrogen is led from the back of the liquid nitrogen vaporizer to the standby sealed air pipeline, a stop valve is arranged on the original sealed air pipeline source, when the system is in emergency stop, after the sealed air is interrupted, a 1.0MPa standby air source at the outlet of the liquid nitrogen pump is opened at the first time, and a source stop valve of the original sealed air pipeline is closed, so that the normal use of the standby sealed air source can be ensured, and the problem of safe operation of an important cryogenic pump after the system is in emergency stop is solved. When the whole system is powered off, the liquid nitrogen pump can not be started to provide 1.0MPa of clean nitrogen, and the nitrogen is fed into the liquid nitrogen vaporizer for one path of 0.4MPa of nitrogen, so that the nitrogen can be continuously and stably supplied, the sealing gas can be continuously and stably supplied to the cryogenic pump around the cold box, and the safety of equipment is ensured. In addition, the system is started again after emergency stop, the cryogenic pump needs to be heated by a single body, the dew point is guaranteed to be qualified, sealing gas needs to be fed firstly, the sealing gas can be fed only after the air dew point of the air compressor booster unit is qualified and delivered, and the sealing gas can be heated and blown in advance only by feeding a spare sealing gas source of the cryogenic pump, so that the system starting time is shortened. As shown in fig. 1, after the standby sealed air source is added, the problem of safe operation of the important cryogenic pump after the emergency stop of the system can be effectively solved, and the time for restarting the system is shortened.
The utility model provides a beneficial effect that technical scheme brought is:
the utility model discloses a cryogenic pump seals gas control system has changed the sealed gas type of important cryogenic pump in the former design, has increased two tunnel reserve safe sealing air supplies, through newly increasing reserve sealed air supply, comes thoroughly to solve the safe operation problem of the important cryogenic pump in the system emergency shutdown back, can shorten the time that the system was driven again simultaneously.
Use the utility model discloses behind the cryopump seal gas system flow, air separation plant system cryopump operation safety and stability has solved the safe operation problem of the important cryopump of system emergency stop back, can shorten the time that the system was driven again simultaneously.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cryopump seal gas control system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example one
As shown in the attached drawing 1, the cryopump seal gas control system of this embodiment includes liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit, and liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit are parallelly connected each other through reserve sealed gas pipeline 1, reserve sealed gas pipeline 1 foremost connect liquid nitrogen pump 2 for provide 1.0Mpa nitrogen gas, reserve sealed gas pipeline 1 front portion set up main valve 3, the pipeline of being connected between reserve sealed gas pipeline 1 and liquid oxygen pump return circuit, liquid argon pump return circuit and the expander return circuit on be provided with first branch valve 4, second branch valve 5 and third branch valve 6, reserve sealed gas pipeline front end still be connected with 0.4Mpa reserve nitrogen gas circuit.
The standby sealed air line 1 of this embodiment is provided with a first shut-off valve 7 at the front.
The 0.4Mpa spare nitrogen gas circuit in this embodiment includes a liquid nitrogen storage tank 8, and the liquid nitrogen storage tank 8 is connected to the front end of the spare sealed gas pipeline 1 through a vaporizer 9 and a pipeline with a second stop valve 10 and a control valve 11.
In this embodiment, the liquid oxygen pump loop includes parallelly connected first liquid oxygen pump 12 and second liquid oxygen pump 13, first liquid oxygen pump 12 and second liquid oxygen pump 13 connect through sealed gas buffer tank 14 reserve sealed gas pipeline 1, sealed gas buffer tank 14 still connect one section clean air input pipeline 15 of booster compressor.
In this embodiment, liquid argon pump return circuit includes first liquid argon pump 16 and second liquid argon pump 17, first liquid argon pump 16 and second liquid argon pump 17 connect after connecting in parallel reserve sealed trachea line 1, just pipeline intercommunication rectifying column between first liquid argon pump 16 and the second liquid argon pump 17 under 0.4Mpa nitrogen gas output pipeline 18 of tower.
The expander loop of the embodiment comprises a first expander 19 and a second expander 20 which are connected in parallel, wherein the first expander 19 and the second expander 20 are respectively connected with the standby sealed air pipeline 1, and the first expander 19 and the second expander 20 are also connected with a clean air input pipeline 21 of a second booster section through pipelines.
In this embodiment, a phi 14 stainless steel pipeline is led from a 1.0MPa clean nitrogen pipeline of a liquid nitrogen pump outlet to branch to original sealed gas pipelines of a liquid oxygen pump, a liquid argon pump and an expansion machine, and a main valve and a branch valve are arranged to realize branch condition control. Meanwhile, a path of 0.4MPa nitrogen is led from the back of the liquid nitrogen vaporizer to the standby sealed air pipeline, and a stop valve is arranged on the original sealed air pipeline source head. When the emergency stop occurs in the system and the sealing gas is interrupted, an operator selects to open one way of the standby gas source according to the actual condition, and closes the source stop valve of the original sealing gas pipeline of each cryogenic pump, so that the normal use of the standby sealing gas source can be ensured, the problem of safe operation of the important cryogenic pump after the emergency stop of the system is solved, and the time for restarting the system can be shortened.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. The utility model provides a cryopump seal gas control system, includes liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit, its characterized in that, liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit connect in parallel each other through reserve sealed gas line, reserve sealed gas line connect the liquid nitrogen pump foremost for provide 1.0Mpa nitrogen gas, reserve sealed gas line front portion set up the main valve, reserve sealed gas line and liquid oxygen pump return circuit, liquid argon pump return circuit and expander return circuit between be provided with branch valve on the pipeline of being connected, reserve sealed gas line front end still be connected with 0.4Mpa reserve nitrogen gas circuit.
2. A cryopump seal gas control system as claimed in claim 1 wherein a first stop valve is provided in front of the backup seal gas line.
3. The cryopump seal gas control system according to claim 1, wherein the 0.4Mpa backup nitrogen gas line includes a liquid nitrogen storage tank connected to a front end of the backup seal gas line through a vaporizer and a pipe having a second stop valve and a control valve.
4. The cryopump seal gas control system of claim 1, wherein the liquid oxygen pump circuit includes a first liquid oxygen pump and a second liquid oxygen pump connected in parallel, the first liquid oxygen pump and the second liquid oxygen pump being connected to the backup seal gas line through a seal gas buffer tank, the seal gas buffer tank being further connected to a section of clean air input line of a booster.
5. The cryopump seal gas control system according to claim 1, wherein the liquid argon pump loop includes a first liquid argon pump and a second liquid argon pump, the first liquid argon pump and the second liquid argon pump are connected in parallel and then connected with the standby seal gas pipeline, and a pipeline between the first liquid argon pump and the second liquid argon pump is communicated with a 0.4Mpa nitrogen gas output pipeline of the lower tower of the rectifying tower.
6. A cryopump seal gas control system as claimed in claim 1 wherein said expander circuit includes a first expander and a second expander connected in parallel, said first expander and said second expander being connected to said backup seal gas line respectively, said first expander and said second expander also being connected by a line to a booster section clean air input line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123010222.6U CN216742837U (en) | 2021-12-01 | 2021-12-01 | Cryogenic pump seal gas control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123010222.6U CN216742837U (en) | 2021-12-01 | 2021-12-01 | Cryogenic pump seal gas control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216742837U true CN216742837U (en) | 2022-06-14 |
Family
ID=81931664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123010222.6U Active CN216742837U (en) | 2021-12-01 | 2021-12-01 | Cryogenic pump seal gas control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216742837U (en) |
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2021
- 2021-12-01 CN CN202123010222.6U patent/CN216742837U/en active Active
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