CN116951900A - Natural gas liquefaction and high-purity helium extraction integrated process - Google Patents

Natural gas liquefaction and high-purity helium extraction integrated process Download PDF

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Publication number
CN116951900A
CN116951900A CN202311104931.1A CN202311104931A CN116951900A CN 116951900 A CN116951900 A CN 116951900A CN 202311104931 A CN202311104931 A CN 202311104931A CN 116951900 A CN116951900 A CN 116951900A
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China
Prior art keywords
helium
natural gas
extraction
nitrogen
output end
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CN202311104931.1A
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Chinese (zh)
Inventor
陈兵
韩泽
孙文军
李亮
南海龙
陈耀武
闫凯安
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Ningxia Tianlifeng Energy Co ltd
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Ningxia Tianlifeng Energy Co ltd
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Priority to CN202311104931.1A priority Critical patent/CN116951900A/en
Publication of CN116951900A publication Critical patent/CN116951900A/en
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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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/028—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 characterised by the separated product stream separation of noble gases
    • F25J3/029—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 characterised by the separated product stream separation of noble gases of helium
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235—Heat exchange integration
    • F25J1/0236—Heat exchange integration providing refrigeration for different processes treating not the same feed stream
    • 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
    • F25J3/0204—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 characterised by the feed stream
    • F25J3/0209—Natural gas or substitute natural gas
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0233—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 characterised by the separated product stream separation of CnHm with 1 carbon atom or more
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0252—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 characterised by the separated product stream separation of hydrogen
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0257—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 characterised by the separated product stream separation 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/08—Processes or apparatus using separation by rectification in a triple pressure main column system
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/40—Processes or apparatus using other separation and/or other processing means using hybrid system, i.e. combining cryogenic and non-cryogenic separation techniques
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F25J2205/64—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end by pressure-swing adsorption [PSA] at the hot end
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/82—Processes or apparatus using other separation and/or other processing means using a reactor with combustion or catalytic reaction
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/04—Recovery of liquid products
    • 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
    • F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/12—External refrigeration with liquid vaporising loop
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/66—Closed external refrigeration cycle with multi component refrigerant [MCR], e.g. mixture of hydrocarbons

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  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention provides a natural gas liquefaction and high-purity helium extraction integrated process, and relates to the technical field of natural gas. The natural gas liquefaction and high-purity helium extraction integrated system comprises an MRC liquefaction module, a BOG helium extraction module, a nitrogen/liquid nitrogen extraction module and a combined ammonia extraction module, wherein the MRC liquefaction module consists of a multistage compressor, a first multistage multi-stream heat exchanger and a throttle valve; the BOG helium extraction module consists of an LNG storage tank, a reheating component and a compressor, the nitrogen/liquid nitrogen extraction module consists of a distillation tower, and the combined ammonia extraction module consists of a helium extraction tower, a second multi-stage multi-stream heat exchanger, a mixer, a PSA component, a catalytic deoxidization component and a helium removal tower. The process of the invention provides cold energy for deeply purifying nitrogen through the integration of the traditional BOG hydrogen extraction process, thereby reducing the PAS adsorption separation treatment capacity, improving the hydrogen yield and quality and reducing the process energy consumption and material consumption.

Description

Natural gas liquefaction and high-purity helium extraction integrated process
Technical Field
The invention relates to the technical field of natural gas, in particular to a natural gas liquefaction and high-purity helium extraction integrated process.
Background
Natural gas is typically obtained from a well drilled into a subsurface reservoir. Natural gas typically has a relatively large proportion of methane, i.e. methane comprises at least 50 molar percent of the natural gas. Depending on the particular subsurface reservoir, natural gas also contains relatively small amounts of heavy hydrocarbons such as ethane, propane, butanes, pentanes, and the like, as well as water, hydrogen, nitrogen, carbon dioxide, and other gases.
Most natural gas is processed in gaseous form. The most common way to transport natural gas from a wellhead to a natural gas processing plant and then to a natural gas consumer is in a high pressure gas delivery pipeline. However, in many instances, we have found that it is necessary and/or desirable to liquefy natural gas for ease of transportation or use. For example, in remote locations, there is typically no pipeline infrastructure for convenient transportation of natural gas for sale. In such cases, lower specific volumes of LNG relative to gaseous natural gas may significantly reduce transportation costs, as cargo ships and transportation trucks may be used to transport LNG.
However, the existing natural gas liquefaction system has high energy consumption, and each component in the natural gas cannot be fully utilized, so that the production efficiency is greatly reduced.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an integrated process for liquefying natural gas and extracting high-purity helium, which solves the problems that the energy consumption of the existing natural gas liquefying system is large and all components in the natural gas cannot be fully utilized.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the integrated process for liquefying natural gas and extracting high-purity helium comprises an MRC liquefying module, a BOG helium extracting module, a nitrogen/liquid nitrogen extracting module and a combined ammonia extracting module; the MRC liquefaction module consists of a multi-stage compressor, a first multi-stage multi-stream heat exchanger and a throttle valve; the BOG helium extraction module consists of an LNG storage tank, a reheating component and a compressor; the nitrogen/liquid nitrogen extraction module consists of a distillation tower; the combined ammonia extraction module consists of a helium extraction tower, a second multi-stage multi-stream heat exchanger, a mixer, a PSA assembly, a catalytic deoxidization assembly and a helium removal tower.
Preferably, the output end of the helium removing tower, the output end of the compressor and the output end of the multi-stage compressor are all connected with the input end of the first multi-stage multi-stream heat exchanger.
Preferably, a throttle pipe is fixedly connected to one side of the first multi-stage multi-stream heat exchanger, and a throttle valve is arranged in the throttle pipe.
Preferably, the input end of the multistage compressor, the two input ends of the helium removing tower and the input end of the LNG storage tank are all connected with the output end of the first multistage multi-stream heat exchanger.
Preferably, the output end of the LNG storage tank is fixedly connected with the input end of the reheating component, and the output end of the reheating component is fixedly connected with the input end of the compressor.
Preferably, the catalytic deoxidizing component is fixedly connected with the output end of the PSA component, and the input end of the output end mixer of the denitrification tower is fixedly connected with the output end of the PSA component.
Preferably, the output end of the upper side of the helium extracting tower and the output end of the mixer are fixedly connected with the input end of the second multi-stage multi-stream heat exchanger, and the input end of the helium extracting tower and the input end of the PSA assembly are fixedly connected with the output end of the second multi-stage multi-stream heat exchanger.
Preferably, the input end of the distillation tower is fixedly connected with the lower side output end of the helium extracting tower.
Based on the integrated process of natural gas liquefaction and high-purity helium extraction, the invention also provides an integrated system of natural gas liquefaction and high-purity helium extraction, which comprises the following steps:
step 1, liquefying natural gas by an MRC liquefying module;
step 2, extracting crude hydrogen by a BOG helium extraction module through a low-temperature separation method in the natural gas liquefaction process, and simultaneously separating nitrogen in the extracted raw materials to prepare liquid nitrogen;
step 3, extracting nitrogen in the raw materials by a PSA adsorption method by the combined ammonia extraction module, so as to prepare liquid nitrogen, and providing cold energy for deeply purifying the nitrogen;
step 4, the nitrogen/liquid nitrogen extraction module further purifies the ammonia gas discharged from the helium extraction tower to obtain nitrogen, liquid nitrogen and part of natural gas;
and 5, carrying out simulation optimization design on the low-temperature helium extraction process based on HYSYS software, analyzing influence factors of key parameters on unit energy consumption, organically combining a natural gas liquefaction process and a high-purity nitrogen extraction process, realizing maximum utilization rate of cold and byproducts, and finally realizing efficient extraction of high-purity helium.
(III) beneficial effects
The integrated process for liquefying natural gas and extracting high-purity helium provided by the invention has the following beneficial effects:
the integrated process integrates the traditional BOG hydrogen extraction process, adopts a technical research route combining a low-temperature separation method and a PSA adsorption method, performs crude hydrogen extraction through the low-temperature separation method in the natural gas liquefaction process, simultaneously separates and extracts nitrogen in raw materials, further prepares liquid nitrogen, and provides cold for deeply purifying the nitrogen, thereby reducing the throughput of PAS adsorption separation, improving the hydrogen yield and quality, and reducing the process energy consumption and material consumption.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Wherein, 1, MRC liquefying module; 101. a multistage compressor; 102. a first multi-stage multi-stream heat exchanger; 103. a throttle valve; 2. a BOG helium extraction module; 201. an LNG storage tank; 202. a reheat assembly; 203. a compressor; 3. a nitrogen/liquid nitrogen extraction module; 301. a distillation column; 4. a combined ammonia extraction module; 401. a helium lifting tower; 402. a second multi-stage multi-stream heat exchanger; 403. a mixer; 404. a PSA assembly; 405. a catalytic deoxygenation assembly; 406. and (5) a denitrification tower.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides an integrated process for liquefying natural gas and extracting high purity helium, which comprises an MRC liquefying module 1, a BOG helium extracting module 2, a nitrogen/liquid nitrogen extracting module 3 and a combined ammonia extracting module 4; the MRC liquefaction module 1 consists of a multi-stage compressor 101, a first multi-stage multi-stream heat exchanger 102 and a throttle valve 103; the output end of the helium removing tower 406, the output end of the compressor 203 and the output end of the multi-stage compressor 101 are all connected with the input end of the first multi-stage multi-stream heat exchanger 102; one side of the first multi-stage multi-stream heat exchanger 102 is fixedly connected with a throttle pipe, a throttle valve 103 is arranged in the throttle pipe, and an input end of the multi-stage compressor 101, two input ends of the helium removing tower 406 and an input end of the LNG storage tank 201 are all connected with an output end of the first multi-stage multi-stream heat exchanger 102.
The BOG helium extraction module 2 consists of an LNG storage tank 201, a reheating component 202 and a compressor 203; the output end of the LNG storage tank 201 is fixedly connected with the input end of the reheating component 202, the output end of the reheating component 202 is fixedly connected with the input end of the compressor 203, the catalytic deoxidizing component 405 is fixedly connected with the output end of the PSA component 404, and the input end of the output end mixer 403 of the denitrification tower 406 is fixedly connected.
The nitrogen/liquid nitrogen extraction module 3 consists of a distillation column 301; the combined ammonia extraction module 4 is composed of a helium extraction tower 401, a second multi-stage multi-stream heat exchanger 402, a mixer 403, a PSA assembly 404, a catalytic deoxidization assembly 405 and a helium removal tower 406, wherein the upper output end of the helium extraction tower 401 and the output end of the mixer 403 are fixedly connected with the input end of the second multi-stage multi-stream heat exchanger 402, the input end of the helium extraction tower 401 and the input end of the PSA assembly 404 are fixedly connected with the output end of the second multi-stage multi-stream heat exchanger 402, and the input end of the distillation tower 301 is fixedly connected with the lower output end of the helium extraction tower 401.
Based on the above embodiment of the integrated process of natural gas liquefaction and high purity helium extraction, it also provides an integrated system of natural gas liquefaction and high purity helium extraction, comprising the following steps:
step 1, liquefying natural gas by an MRC liquefying module;
step 2, coarse hydrogen extraction is carried out by the BOG helium extraction module through a low-temperature separation method in the natural gas liquefaction process, and nitrogen in the extracted raw materials is separated at the same time, so that liquid nitrogen is prepared
Step 3, extracting nitrogen in the raw materials by a PSA adsorption method by the combined ammonia extraction module, so as to prepare liquid nitrogen, and providing cold energy for deeply purifying the nitrogen;
step 4, the nitrogen/liquid nitrogen extraction module further purifies the ammonia gas discharged from the helium extraction tower to obtain nitrogen, liquid nitrogen and part of natural gas;
and 5, carrying out simulation optimization design on the low-temperature helium extraction process based on HYSYS software, analyzing influence factors of key parameters on unit energy consumption, organically combining a natural gas liquefaction process and a high-purity nitrogen extraction process, realizing maximum utilization rate of cold and byproducts, and finally realizing efficient extraction of high-purity helium.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The integrated system for liquefying natural gas and extracting high-purity helium is characterized in that: the integrated system comprises an MRC liquefying module (1), a BOG helium extracting module (2), a nitrogen/liquid nitrogen extracting module (3) and a combined helium extracting module (4); the MRC liquefaction module (1) consists of a multistage compressor (101), a first multistage multi-stream heat exchanger (102) and a throttle valve (103); the BOG helium extraction module (2) consists of an LNG storage tank (201), a reheating component (202) and a compressor (203); the nitrogen/liquid nitrogen extraction module (3) consists of a distillation tower (301); the combined ammonia extraction module (4) consists of a helium extraction tower (401), a second multi-stage multi-stream heat exchanger (402), a mixer (403), a PSA assembly (404), a catalytic deoxidization assembly (405) and a helium removal tower (406).
2. The integrated natural gas liquefaction and high purity helium extraction system of claim 1, wherein: the output end of the helium removing tower (406), the output end of the compressor (203) and the output end of the multi-stage compressor (101) are all connected with the input end of the first multi-stage multi-stream heat exchanger (102).
3. The integrated process for liquefying natural gas and extracting high purity helium according to claim 1, wherein: one side of the first multi-stage multi-strand heat exchanger (102) is fixedly connected with a throttle pipeline, and the throttle valve (103) is arranged in the throttle pipeline.
4. The integrated natural gas liquefaction and high purity helium extraction system of claim 1, wherein: the input end of the multistage compressor (101), the two input ends of the helium removing tower (406) and the input end of the LNG storage tank (201) are connected with the output end of the first multistage multi-stream heat exchanger (102).
5. The integrated natural gas liquefaction and high purity helium extraction system of claim 1, wherein: the output end of the LNG storage tank (201) is fixedly connected with the input end of the reheating component (202), and the output end of the reheating component (202) is fixedly connected with the input end of the compressor (203).
6. The integrated natural gas liquefaction and high purity helium extraction system of claim 1, wherein: the catalytic deoxidization assembly (405) is fixedly connected with the output end of the PSA assembly (404), and the input end of the output end mixer (403) of the denitrification tower (406) is fixedly connected with the output end of the PSA assembly.
7. The integrated natural gas liquefaction and high purity helium extraction system of claim 1, wherein: the upper output end of the helium extraction tower (401) and the output end of the mixer (403) are fixedly connected with the input end of the second multi-stage multi-stream heat exchanger (402), and the input end of the helium extraction tower (401) and the input end of the PSA component (404) are fixedly connected with the output end of the second multi-stage multi-stream heat exchanger (402).
8. The integrated natural gas liquefaction and high purity helium extraction system of claim 1, wherein: the input end of the distillation tower (301) is fixedly connected with the lower side output end of the helium extraction tower (401).
9. The integrated system for liquefying natural gas and extracting high-purity helium is characterized by comprising the following steps of:
step 1, liquefying natural gas by an MRC liquefying module;
step 2, extracting crude hydrogen by a BOG helium extraction module through a low-temperature separation method in the natural gas liquefaction process, and simultaneously separating nitrogen in the extracted raw materials to prepare liquid nitrogen;
step 3, extracting nitrogen in the raw materials by a PSA adsorption method by the combined ammonia extraction module, so as to prepare liquid nitrogen, and providing cold energy for deeply purifying the nitrogen;
step 4, the nitrogen/liquid nitrogen extraction module further purifies the ammonia gas discharged from the helium extraction tower to obtain nitrogen, liquid nitrogen and part of natural gas;
and 5, carrying out simulation optimization design on the low-temperature helium extraction process based on HYSYS software, analyzing influence factors of key parameters on unit energy consumption, organically combining a natural gas liquefaction process and a high-purity nitrogen extraction process, realizing maximum utilization rate of cold and byproducts, and finally realizing efficient extraction of high-purity helium.
CN202311104931.1A 2023-08-30 2023-08-30 Natural gas liquefaction and high-purity helium extraction integrated process Pending CN116951900A (en)

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CN113460982A (en) * 2021-07-13 2021-10-01 西南化工研究设计院有限公司 Method for purifying and preparing high-purity helium from liquefied natural gas tail gas
CN115888386A (en) * 2022-12-07 2023-04-04 上海中集天照清洁能源有限公司 Process for extracting helium from high-nitrogen BOG gas

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CN208332859U (en) * 2018-03-23 2019-01-04 中科瑞奥能源科技股份有限公司 Helium and liquefied system are proposed from natural gas
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CN113108551A (en) * 2021-05-17 2021-07-13 中石化中原石油工程设计有限公司 Process and device for extracting high-purity helium in liquefied natural gas production process
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