CN214892166U - Device for maintaining operation of synthetic ammonia system during jumping of air separation system - Google Patents

Device for maintaining operation of synthetic ammonia system during jumping of air separation system Download PDF

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Publication number
CN214892166U
CN214892166U CN202120961912.0U CN202120961912U CN214892166U CN 214892166 U CN214892166 U CN 214892166U CN 202120961912 U CN202120961912 U CN 202120961912U CN 214892166 U CN214892166 U CN 214892166U
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China
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pressure
pressure nitrogen
liquid nitrogen
nitrogen pipeline
pipeline
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Active
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CN202120961912.0U
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Chinese (zh)
Inventor
李乐伦
齐兆焜
祝祥年
孙友文
许慎勇
孙岩
李勇
李刚
蒋化勇
张原娟
喻勇勇
侯倩倩
李家栋
胡小娟
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Yankuang Xinjiang Coal Chemical Co ltd
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Yankuang Xinjiang Coal Chemical Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
    • F25J3/04587—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for the NH3 synthesis, e.g. for adjusting the H2/N2 ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/42—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
    • F25J2240/44—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval the fluid being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/42—One fluid being nitrogen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model relates to a synthetic ammonia production technical field is a device of maintaining synthetic ammonia system operation during air separation system jump, and it includes that compression, purification and supercharging device, rectifying column, heat exchanger, liquid nitrogen wash and synthetic ammonia device, liquid nitrogen storage tank, middling pressure nitrogen gas spherical tank and water bath formula vaporizer, and fixed intercommunication has the air pipeline between compression, purification and supercharging device export and the rectifying column import. The utility model has the advantages of reasonable and compact structure, high durability and convenient use, it is on current air separation plant's basis, a reserve high pressure liquid nitrogen pump and supporting facility have been add behind the liquid nitrogen storage tank, when the air separation plant jumps the car, reserve high pressure liquid nitrogen pump and supporting facility quick start can wash and synthetic ammonia device provides high-pressure nitrogen gas for the liquid nitrogen, provide middling pressure nitrogen gas for the back system, the normal operating that the liquid nitrogen washed and synthetic ammonia device and back system has been guaranteed, avoid energy loss and the environmental protection problem that a large amount of essence gas emptys and cause, realize energy-concerving and environment-protective wound effect.

Description

Device for maintaining operation of synthetic ammonia system during jumping of air separation system
Technical Field
The utility model relates to a synthetic ammonia production technical field is a device that maintains synthetic ammonia system operation when empty system jumps vehicle.
Background
Yan Xinjiang coal chemical Co-production 60 million tons of alcohol and ammonia as a Shandong energy group (formerly Yan)Mine group) was started in Xinjiang, using local bituminous coal in Xinjiang as raw material, and using multi-nozzle coal-water slurry pressure gasification technology, the productivity was designed to produce 30 ten thousand tons of methanol, 30 ten thousand tons of synthetic ammonia, and 52 ten thousand tons of urea each year. 80000Nm matched with the project3The air separation plant of/h, during normal production, produces pressurized nitrogen and liquid oxygen and supplies high-pressure oxygen, high-pressure nitrogen, medium-pressure nitrogen and low-pressure nitrogen to the outside. The high-pressure oxygen is mainly used for coal water slurry gasification reaction to provide synthesis gas for a rear system, and the high-pressure nitrogen is mainly supplied to a liquid nitrogen washing section and used for washing out the impurities of refined gas which are not completely removed in a low washing section and configuring the hydrogen-nitrogen ratio in the refined gas to reach 3: 1, the method is used for producing liquid ammonia in the ammonia synthesis process.
Because the air separation device is a single set of 80000Nm3A/h linde unit without a standby device. When the air separation device jumps, no liquid product and high-pressure oxygen and nitrogen are sent out, a high-pressure oxygen backup system self-provided by the original air separation device can be used for continuing the operation of the gasification furnace, but is limited by a high-pressure nitrogen system, the liquid nitrogen washing and ammonia synthesis device needs to be stopped, the operation can be recovered after the normal operation of the air separation device, refined gas needs to be discharged after a low-temperature methanol washing section and discharged after torch combustion, and the discharge capacity is about 110000 Nm/h at the lowest. Generally, after the air separation device jumps, a plurality of processes such as vehicle jumping reason, unit rush and transfer, oxygen and nitrogen purification and the like need to be checked, the time consumption is about 5 hours at least, a large amount of raw materials are wasted, the environment pollution is easily caused, and a certain safety risk exists in the process of emptying a large amount of refined gas.
Disclosure of Invention
The utility model provides a device for maintaining synthetic ammonia system operation during air separation system jump has overcome above-mentioned prior art not enough, and it can effectively solve the raw materials waste that current air separation plant jump exists, the problem of polluted environment behind a large amount of refined gas unloading.
The technical scheme of the utility model is realized through following measure: a device for maintaining the operation of a synthetic ammonia system during the jumping of an air separation system comprises a compression, purification and pressurization device, a rectifying tower, a heat exchanger, a liquid nitrogen washing and synthetic ammonia device, a liquid nitrogen storage tank, a medium-pressure nitrogen spherical tank and a water bath type vaporizer, wherein an air pipeline is fixedly communicated between an outlet of the compression, purification and pressurization device and an inlet of the rectifying tower, a first liquid nitrogen pipeline is fixedly communicated between an outlet of the lower part of the rectifying tower and an inlet of the low-temperature side of the heat exchanger, a second liquid nitrogen pipeline is fixedly communicated between the first liquid nitrogen pipeline and the inlet of the liquid nitrogen storage tank, a first high-pressure nitrogen pipeline is fixedly communicated between the outlet of the high-temperature side of the heat exchanger and the inlet of the liquid nitrogen washing and synthetic ammonia device, a first medium-pressure nitrogen pipeline is fixedly communicated between the first high-pressure nitrogen pipeline and the inlet of the medium-pressure nitrogen spherical tank, a second medium-pressure nitrogen pipeline is fixedly communicated between the outlet of the medium-pressure nitrogen spherical tank and the inlet of the water bath type vaporizer, a third high-pressure nitrogen pipeline is fixedly communicated between the first medium-pressure nitrogen pipeline and the outlet of the water bath type vaporizer between the first medium-pressure nitrogen pipeline and the liquid nitrogen washing and ammonia synthesizing device, a fourth high-pressure nitrogen pipeline is fixedly installed between the third high-pressure nitrogen pipeline and the medium-pressure nitrogen spherical tank, a high-pressure liquid nitrogen pump is fixedly installed on the first liquid nitrogen pipeline between the second liquid nitrogen pipeline and the heat exchanger, and a backup high-pressure liquid nitrogen pump is fixedly installed on the second high-pressure nitrogen pipeline.
The device for maintaining the operation of the synthetic ammonia system during the jumping of the air separation system can be further optimized or/and improved according to the actual requirement:
and a pressure reducing valve is fixedly arranged on the first medium-pressure nitrogen pipeline.
And a pressure reducing valve is fixedly arranged on the fourth high-pressure nitrogen pipeline.
A valve is fixedly arranged on the first high-pressure nitrogen pipeline between the heat exchanger and the first medium-pressure nitrogen pipeline, a valve is fixedly arranged on the third high-pressure nitrogen pipeline between the first high-pressure nitrogen pipeline and the fourth high-pressure nitrogen pipeline, and a valve is fixedly arranged on the second medium-pressure nitrogen pipeline.
The utility model discloses on current air separation plant's basis, a reserve high-pressure liquid nitrogen pump and supporting facility have been add behind the liquid nitrogen storage tank, when the air separation plant jumps the car, reserve high-pressure liquid nitrogen pump and supporting facility quick start can wash and the synthetic ammonia device provides high-pressure nitrogen gas for the liquid nitrogen, provide middling pressure nitrogen gas for the back system, guaranteed that the liquid nitrogen washes and the normal operating of synthetic ammonia device and back system, avoid energy loss and the environmental protection problem that a large amount of essence gas emptys and cause, realize energy-concerving and environment-protective wound effect.
Drawings
FIG. 1 is a schematic process flow diagram of the preferred embodiment of the present invention.
The codes in the figures are respectively: 1 is a compression, purification and pressurization device, 2 is a rectifying tower, 3 is a heat exchanger, 4 is a liquid nitrogen washing and ammonia synthesis device, 5 is a liquid nitrogen storage tank, 6 is a medium-pressure nitrogen spherical tank, 7 is a water bath vaporizer, 8 is an air pipeline, 9 is a first liquid nitrogen pipeline, 10 is a second liquid nitrogen pipeline, 11 is a first high-pressure nitrogen pipeline, 12 is a first medium-pressure nitrogen pipeline, 13 is a second medium-pressure nitrogen pipeline, 14 is a second high-pressure nitrogen pipeline, 15 is a third high-pressure nitrogen pipeline, 16 is a fourth high-pressure nitrogen pipeline, 17 is a high-pressure liquid nitrogen pump, 18 is a backup high-pressure liquid nitrogen pump, 19 is a pressure reducing valve, 20 is a valve, and 21 is a rear system.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention will be further described with reference to the following examples and drawings:
as shown in attached figure 1, the device for maintaining the operation of the synthetic ammonia system during the jump of the air separation system comprises a compression, purification and pressurization device 1, a rectifying tower 2, a heat exchanger 3, a liquid nitrogen washing and synthetic ammonia device 4, a liquid nitrogen storage tank 5, a medium-pressure nitrogen spherical tank 6 and a water bath type vaporizer 7, wherein an air pipeline 8 is fixedly communicated between the outlet of the compression, purification and pressurization device 1 and the inlet of the rectifying tower 2, a first liquid nitrogen pipeline 9 is fixedly communicated between the lower outlet of the rectifying tower 2 and the inlet of the low-temperature side of the heat exchanger 3, a second liquid nitrogen pipeline 10 is fixedly communicated between the first liquid nitrogen pipeline 9 and the inlet of the liquid nitrogen storage tank 5, a first high-pressure nitrogen pipeline 11 is fixedly communicated between the outlet of the high-temperature side of the heat exchanger 3 and the inlet of the liquid nitrogen washing and synthetic ammonia device 4, a first medium-pressure nitrogen pipeline 12 is fixedly communicated between the first high-pressure nitrogen pipeline 11 and the inlet of the medium-pressure nitrogen spherical tank 6, a second medium-pressure nitrogen pipeline 13 is fixedly communicated between the outlet of the medium-pressure nitrogen spherical tank 6, a second high-pressure nitrogen pipeline 14 is fixedly communicated between the outlet of the liquid nitrogen storage tank 5 and the inlet of the water bath type vaporizer 7, a third high-pressure nitrogen pipeline 15 is fixedly communicated between the first high-pressure nitrogen pipeline 11 between the first medium-pressure nitrogen pipeline 12 and the liquid nitrogen washing and ammonia synthesis device 4 and the outlet of the water bath type vaporizer 7, a fourth high-pressure nitrogen pipeline 16 is fixedly installed between the third high-pressure nitrogen pipeline 15 and the medium-pressure nitrogen spherical tank 6, a high-pressure liquid nitrogen pump 17 is fixedly installed on the first liquid nitrogen pipeline 9 between the second liquid nitrogen pipeline 10 and the heat exchanger 3, and a backup high-pressure liquid nitrogen pump 18 is fixedly installed on the second high-pressure nitrogen pipeline 14.
The utility model discloses on current air separation plant's basis, increased a reserve high-pressure liquid nitrogen pump 18 behind liquid nitrogen storage tank 5, water bath vaporizer 7 and supporting pipeline, when the air separation plant jumps the car, reserve high-pressure liquid nitrogen pump 18 starts fast, liquid nitrogen in the liquid nitrogen storage tank 5 is carried to water bath vaporizer 7 after reserve high-pressure liquid nitrogen pump 18 pressurizes, liquid nitrogen in water bath vaporizer 7 obtains high-pressure nitrogen gas through the vaporization, partly high-pressure liquid nitrogen is carried to liquid nitrogen washing and synthetic ammonia device 4 by third high-pressure nitrogen gas pipeline 15 and first high-pressure nitrogen gas pipeline 11, guaranteed liquid nitrogen washing and synthetic ammonia device 4's normal operating, another part is carried to carrying and is carried the steady voltage in middling pressure nitrogen gas spherical tank 6 through third high-pressure nitrogen gas pipeline 15 and fourth high-pressure nitrogen gas pipeline 16, the middling pressure nitrogen gas that obtains is carried to back system 21 through second middling pressure nitrogen gas pipeline 13, the normal operating of back system 21 has been guaranteed, consequently, the utility model discloses when the air separation plant jumps the vehicle, not only guaranteed that the liquid nitrogen washes and the normal operating of synthetic ammonia device 4, can also guarantee the normal operating of back system 21, energy loss and the environmental protection problem of avoiding a large amount of refined gas to empty the air and cause realize energy-concerving and environment-protective wound.
The utility model discloses a rectifying column 2 and heat exchanger 3 set up in empty cold box that divides.
The utility model discloses a compression, purification and supercharging device 1 includes air compressor, clarifier and booster compressor.
In the utility model, the rectifying tower 2 is a sieve plate tower provided by Linde group or other known and used rectifying towers; the heat exchanger 3 is a stainless steel plate fin heat exchanger or other prior known and public heat exchangers provided by Linde group, the liquid nitrogen storage tank 5 is a 7310 BZA 2001 or other prior known and public storage tank provided by Hangzhou oxygenerator group GmbH, and the high-pressure liquid nitrogen pump 17 is a 3569 MZA 2001 or other prior known and public liquid nitrogen pump provided by Linde group; the backup high-pressure liquid nitrogen pump 18 is a BXLL111 model or other existing public liquid nitrogen pumps provided by Hangzhou oxygen tool pump valve company limited; the water bath type gasifier is provided by Hangzhou oxygen low temperature container limited company in Hangzhou, and is QZD22B or other water bath type gasifiers which are publicly known and used in the prior art, and the liquid nitrogen washing and synthetic ammonia device 4 and the medium-pressure nitrogen spherical tank 6 are conventional equipment which are publicly known and used in the prior synthetic ammonia process.
The device for maintaining the operation of the synthetic ammonia system during the jumping of the air separation system can be further optimized or/and improved according to the actual requirement:
as shown in fig. 1, a pressure reducing valve 19 is fixedly installed on the first medium-pressure nitrogen gas line 12.
As shown in fig. 1, a pressure reducing valve 19 is fixedly installed on the fourth high-pressure nitrogen gas line 16.
As shown in fig. 1, a valve 20 is fixedly installed on the first high-pressure nitrogen pipeline 11 between the heat exchanger 3 and the first medium-pressure nitrogen pipeline 12, a valve 20 is fixedly installed on the third high-pressure nitrogen pipeline 15 between the first high-pressure nitrogen pipeline 11 and the fourth high-pressure nitrogen pipeline 16, and a valve 20 is fixedly installed on the second medium-pressure nitrogen pipeline 13.
In the present invention, the pressure reducing valve 19 and the valve 20 are conventional valves known and used in the art.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
The utility model discloses the use of preferred embodiment is as follows:
the normal operation process of the air separation device: air is compressed, purified and pressurized by a compression, purification and pressurization device 1 and then is conveyed to a rectifying tower 2, the air is separated in the rectifying tower 2 to obtain liquid nitrogen, one part of the liquid nitrogen is conveyed to a liquid nitrogen storage tank 5 for storage by a first liquid nitrogen pipeline 9 and a second liquid nitrogen pipeline 10, the other part of the liquid nitrogen is pressurized by a high-pressure liquid nitrogen pump 17 and then is conveyed to a heat exchanger 3, the liquid nitrogen exchanges heat in the heat exchanger 3 to obtain high-pressure nitrogen, one part of the high-pressure nitrogen is conveyed to a liquid nitrogen washing and ammonia synthesis device 4 by a first high-pressure nitrogen pipeline 11 for producing liquid ammonia, the other part of the high-pressure nitrogen is decompressed to 2.5MPa by a decompression valve 19 on a first medium-pressure nitrogen pipeline 12, the decompressed high-pressure nitrogen is conveyed to a medium-pressure nitrogen spherical tank 6 by a first medium-pressure nitrogen pipeline 12 for pressure stabilization, the obtained medium pressure nitrogen is conveyed to a back system 21 by a second medium-pressure nitrogen pipeline 13, the post system 21 is supplied with medium pressure nitrogen.
The air separation device jumps to ensure the normal operation process of the liquid nitrogen washing and synthetic ammonia device 4 and the back system 21: when the air separation device jumps, the high-pressure liquid nitrogen pump 17 is stopped, the backup high-pressure liquid nitrogen pump 18 is quickly started, liquid nitrogen in the liquid nitrogen storage tank 5 is pressurized by the backup high-pressure liquid nitrogen pump 18 and then is conveyed into the water bath vaporizer 7, the liquid nitrogen is vaporized in the water bath vaporizer 7 to obtain high-pressure nitrogen, one part of the high-pressure nitrogen is conveyed into the liquid nitrogen washing and ammonia synthesis device 4 through the third high-pressure nitrogen pipeline 15 and the first high-pressure nitrogen pipeline 11 to be used for producing liquid ammonia, the other part of the high-pressure nitrogen is depressurized to 2.5MPa through a pressure reducing valve 19 on the fourth high-pressure nitrogen pipeline 16, the depressurized high-pressure nitrogen is conveyed into the medium-pressure nitrogen spherical tank 6 through the fourth high-pressure nitrogen pipeline 16 to be stabilized, the obtained medium-pressure nitrogen is conveyed into the rear system 21 through the second medium-pressure nitrogen pipeline 13 to provide medium-pressure nitrogen for the rear system 21, when the air separation device can produce high-pressure nitrogen and medium-pressure nitrogen and has an outward conveying condition, and gradually recovering to the original normal operation process of the air separation unit, wherein at the moment, the backup high-pressure liquid nitrogen pump 18, the water bath type vaporizer 7 and the matched pipelines thereof are in a state of idle running and backup when the air separation unit operates normally.

Claims (5)

1. A device for maintaining the operation of a synthetic ammonia system during the jumping of an air separation system is characterized by comprising a compression, purification and pressurization device, a rectifying tower, a heat exchanger, a liquid nitrogen washing and synthetic ammonia device, a liquid nitrogen storage tank, a medium-pressure nitrogen spherical tank and a water bath type vaporizer, wherein an air pipeline is fixedly communicated between an outlet of the compression, purification and pressurization device and an inlet of the rectifying tower, a first liquid nitrogen pipeline is fixedly communicated between an outlet at the lower part of the rectifying tower and an inlet at the low-temperature side of the heat exchanger, a second liquid nitrogen pipeline is fixedly communicated between the first liquid nitrogen pipeline and the inlet of the liquid nitrogen storage tank, a first high-pressure nitrogen pipeline is fixedly communicated between the outlet at the high-temperature side of the heat exchanger and the inlet of the liquid nitrogen washing and synthetic ammonia device, a first medium-pressure nitrogen pipeline is fixedly communicated between the first high-pressure nitrogen pipeline and the inlet of the medium-pressure nitrogen spherical tank, and a second medium-pressure nitrogen pipeline is fixedly communicated between the outlet of the medium-pressure nitrogen spherical tank, a second high-pressure nitrogen pipeline is fixedly communicated between the outlet of the liquid nitrogen storage tank and the inlet of the water bath type vaporizer, a third high-pressure nitrogen pipeline is fixedly communicated between the first high-pressure nitrogen pipeline between the first medium-pressure nitrogen pipeline and the liquid nitrogen washing and ammonia synthesis device and the outlet of the water bath type vaporizer, a fourth high-pressure nitrogen pipeline is fixedly installed between the third high-pressure nitrogen pipeline and the medium-pressure nitrogen spherical tank, a high-pressure liquid nitrogen pump is fixedly installed on the first liquid nitrogen pipeline between the second liquid nitrogen pipeline and the heat exchanger, and a backup high-pressure liquid nitrogen pump is fixedly installed on the second high-pressure nitrogen pipeline.
2. The device for maintaining the operation of the synthetic ammonia system during the jumping of the air separation system according to claim 1, wherein a pressure reducing valve is fixedly installed on the first medium-pressure nitrogen pipeline.
3. The device for maintaining the operation of the synthetic ammonia system during the jumping of the air separation system according to claim 1 or 2, wherein a pressure reducing valve is fixedly installed on the fourth high-pressure nitrogen pipeline.
4. The device for maintaining the operation of the synthetic ammonia system during the jumping of the air separation system according to claim 1 or 2, characterized in that a valve is fixedly installed on a first high-pressure nitrogen pipeline between the heat exchanger and a first medium-pressure nitrogen pipeline, a valve is fixedly installed on a third high-pressure nitrogen pipeline between the first high-pressure nitrogen pipeline and a fourth high-pressure nitrogen pipeline, and a valve is fixedly installed on a second medium-pressure nitrogen pipeline.
5. The device for maintaining the operation of the synthetic ammonia system during the jumping of the air separation system according to claim 3, wherein a valve is fixedly installed on the first high-pressure nitrogen pipeline between the heat exchanger and the first medium-pressure nitrogen pipeline, a valve is fixedly installed on the third high-pressure nitrogen pipeline between the first high-pressure nitrogen pipeline and the fourth high-pressure nitrogen pipeline, and a valve is fixedly installed on the second medium-pressure nitrogen pipeline.
CN202120961912.0U 2021-05-07 2021-05-07 Device for maintaining operation of synthetic ammonia system during jumping of air separation system Active CN214892166U (en)

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CN202120961912.0U CN214892166U (en) 2021-05-07 2021-05-07 Device for maintaining operation of synthetic ammonia system during jumping of air separation system

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Application Number Priority Date Filing Date Title
CN202120961912.0U CN214892166U (en) 2021-05-07 2021-05-07 Device for maintaining operation of synthetic ammonia system during jumping of air separation system

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