CN213147125U - Deep air separation system - Google Patents

Deep air separation system Download PDF

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Publication number
CN213147125U
CN213147125U CN202021673861.3U CN202021673861U CN213147125U CN 213147125 U CN213147125 U CN 213147125U CN 202021673861 U CN202021673861 U CN 202021673861U CN 213147125 U CN213147125 U CN 213147125U
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China
Prior art keywords
tower
outlet
air separation
liquid oxygen
separation system
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CN202021673861.3U
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Chinese (zh)
Inventor
顾书锋
王玉磊
于文中
李建平
寿华
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Kaifeng Saipu Air Separation Equipment Co ltd
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Kaifeng Saipu Air Separation Equipment 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • 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
    • F25J3/0409—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 oxygen
    • 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
    • F25J3/04103—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 using solely hydrostatic liquid head
    • 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
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • F25J3/04206—Division of the main heat exchange line in consecutive sections having different functions including a so-called "auxiliary vaporiser" for vaporising and producing a gaseous product
    • 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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • 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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
    • 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
    • F25J3/04406—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 using a dual pressure main column system
    • F25J3/04412—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 using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
    • F25J3/04957—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipments upstream of the fractionation unit (s), i.e. at the "front-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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/40—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being air
    • 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
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/04—Multiple expansion turbines in parallel
    • 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
    • F25J2250/40—One fluid being air
    • 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
    • F25J2250/50—One fluid being oxygen

Abstract

The application discloses degree of depth air separation system, including precooling system, liquid oxygen evaporimeter and fractionating tower. The precooling system comprises a supercharger, a supercharging heat exchanger and an expander, and is used for deeply refrigerating the material; the liquid oxygen evaporator comprises a tower top outlet, a first tower bottom outlet, a second tower bottom outlet, a tower body inlet and a reflux inlet, wherein the tower top outlet is used for discharging separated oxygen, and the first tower bottom outlet is used for discharging liquid oxygen; the fractionating tower comprises an upper tower, a lower tower and a main cooler arranged at the bottom of the upper tower, the upper tower is positioned at the top of the lower tower, the top of the upper tower is provided with an upper tower exhaust port for discharging nitrogen and a tower middle inlet communicated with a material outlet of the precooling system, and the lower tower is provided with a lower tower air inlet. By adopting the technical scheme, the air separation efficiency can be effectively improved, the capacity utilization rate of the whole system can be improved, the operation is simple and convenient, and the economy is high.

Description

Deep air separation system
Technical Field
The application relates to the technical field of air separation, in particular to a deep air separation system.
Background
Air separation, air separation for short, is a process of separating oxygen and nitrogen from air by deep freezing, adsorption, membrane separation and other methods or simultaneously extracting rare gases such as helium, argon and the like by utilizing different physical properties of various components in the air, and is widely applied to industrial departments such as metallurgy, chemical industry, petroleum, machinery, mining, food, military and the like.
For the main system of air separation, the most used method is to obtain oxygen and nitrogen by compressing, expanding, refrigerating and rectifying the air. In the oxygen making device of the scheme, the problems of low oxygen making efficiency and low energy utilization rate are caused because the layout and the circulating material design of the device are unreasonable and only one main cold heat exchange is commonly arranged.
Therefore, it is necessary to improve the cooling device and the operation flow, and develop an air separation device with low energy consumption, economy and high efficiency, so as to meet the requirements of energy conservation and emission reduction.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
Disclosure of Invention
The application provides a degree of depth air separation system can effectual improvement air separation's efficiency to can improve entire system's ability utilization ratio, easy operation is convenient, and the economic nature is high.
The technical scheme adopted by the application is as follows:
a deep air separation system comprising:
the precooling system comprises a supercharger, a supercharging heat exchanger and an expander, and is used for deeply refrigerating the material;
the liquid oxygen evaporator comprises a tower top outlet, a first tower bottom outlet, a second tower bottom outlet, a tower body inlet and a reflux inlet, wherein the tower top outlet is used for discharging separated oxygen, and the first tower bottom outlet is used for discharging liquid oxygen;
the fractionating tower comprises an upper tower, a lower tower and a main cooler arranged at the bottom of the upper tower, the upper tower is positioned at the top of the lower tower, an upper tower exhaust port used for discharging nitrogen and a tower middle inlet communicated with a material outlet of the precooling system are arranged at the top of the upper tower, and a lower tower air inlet is arranged at the lower tower.
Preferably, the materials are divided into a first sub-material and a second sub-material, the first sub-material enters the pre-cooling system, and the second sub-material enters the liquid oxygen evaporator.
Preferably, a first heat exchanger is arranged in front of the liquid oxygen evaporator.
Preferably, the lower column is provided with a lower column outlet, which is in communication with the liquid oxygen evaporator.
Preferably, the lower tower is further provided with a lower tower circulation outlet communicated to the main cooler.
Preferably, the top end of the upper tower is provided with an upper tower circulating outlet communicated with the main cooler.
Preferably, a second heat exchanger is arranged between the fractionating tower and the liquid oxygen evaporator.
Preferably, the fractionating tower is further provided with a liquid level adjusting system, and the liquid level adjusting system comprises a liquid adjusting pipeline and a control valve arranged in the liquid adjusting pipeline.
Due to the adoption of the technical scheme, the beneficial effects obtained by the application are as follows: one part of the materials (pretreated air) enters the fractionating tower through the precooling system, the other part of the materials enters the fractionating tower through the liquid oxygen evaporator and is separated in the fractionating tower, nitrogen is discharged from the fractionating tower, and liquid enters the liquid oxygen evaporator through the tower bottom to separate oxygen, so that the efficiency of air separation is effectively improved. In the air separation process, each material is subjected to energy exchange for many times, so that the energy is fully utilized, the energy is saved, and the whole system has higher economy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic illustration of a deep air separation system according to the present application.
The system comprises a precooling system 1, a supercharger 11, a supercharged heat exchanger 12, an expander 13, a liquid oxygen evaporator 2, a tower top outlet 21, a first tower bottom outlet 22, a second tower bottom outlet 23, a tower body inlet 24, a reflux inlet 25, a fractionating tower 3, an upper tower 31, a lower tower 32, a main cooler 33, an upper tower exhaust port 34, a middle tower inlet 35, a lower tower inlet 36, a lower tower outlet 37, a lower tower circulation outlet 38, an upper tower circulation outlet 39, a material 4, a first sub-material 41, a second sub-material 42, a first heat exchanger 5, a second heat exchanger 6, a liquid regulating pipeline 7 and a control valve 8.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the positional or orientational relationship shown in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, a deep air separation system includes a pre-cooling system 1, a liquid oxygen evaporator 2 and a fractionating tower 3 which are connected to each other. The precooling system comprises a supercharger 11, a supercharging heat exchanger 12 and an expander 13, and is used for deeply refrigerating the material; the liquid oxygen evaporator 2 comprises a tower top outlet 21 for discharging the separated oxygen, a first tower bottom outlet 22 for discharging the liquid oxygen, a second tower bottom outlet 23, a tower body inlet 24 and a reflux inlet 25; the fractionating tower 3 comprises an upper tower 31, a lower tower 32 and a main cooler 33 arranged at the bottom of the upper tower, the upper tower is positioned at the top of the lower tower, an upper tower exhaust port 34 for discharging nitrogen and a tower middle inlet 35 communicated with a material outlet of the precooling system are arranged at the top of the upper tower, and a lower tower air inlet 36 is arranged at the lower tower.
In the above structure, the material 4 is divided into a first sub-material 41 and a second sub-material 42, the first sub-material enters the pre-cooling system, and the second sub-material enters the liquid oxygen evaporator. A first heat exchanger 5 is arranged in front of the liquid oxygen evaporator. The lower tower is provided with a lower tower outlet 37 which is communicated with the liquid oxygen evaporator. The lower column is also provided with a lower column recycle outlet 38 which communicates to the main chiller. And an upper tower circulating outlet 39 communicated with the main cooler is arranged at the top end of the upper tower. And a second heat exchanger 6 is also arranged between the fractionating tower and the liquid oxygen transmitter. The fractionating tower is further provided with a liquid level adjusting system, and the liquid level adjusting system comprises a liquid adjusting pipeline 7 and a control valve 8 arranged in the liquid adjusting pipeline.
Specifically, the pretreated air material enters a precooling system, firstly enters a supercharger for supercharging, then passes through a supercharging heat exchanger, passes through an expansion machine after heat exchange, so that the material is deeply liquefied, and the deeply liquefied material enters the upper tower part of a fractionating tower from an inlet in the tower. In order to guarantee smooth operation of the whole system, the system is provided with two sets of precooling systems connected in parallel, and when one set of precooling system breaks down, the other set of precooling system is immediately switched to be used, so that the efficiency of the whole system is improved.
In order to improve the air separation efficiency, the material is divided into two materials, namely a first material enters the precooling system, and a second material enters the liquid oxygen evaporator through the tower body inlet after passing through the first heat exchanger.
The material entering the fractionating tower forms gaseous nitrogen and liquid oxygen in the upper tower, the liquid oxygen enters the liquid oxygen evaporator from the reflux inlet for separation, the gaseous oxygen is discharged from the tower top outlet of the liquid oxygen evaporator, and the liquid oxygen is discharged from the first tower bottom outlet. The first sub-material enters the liquid oxygen evaporator after heat exchange through the first heat exchanger, further exchanges heat with the material from the fractionating tower in the liquid oxygen evaporator, improves the utilization rate of energy, enters the fractionating tower after energy exchange, and is further separated in the fractionating tower.
For the liquid level in the control lower tower, the fractionating tower is further provided with a liquid level adjusting system, the liquid level adjusting system comprises a liquid adjusting pipeline and a control valve arranged in the liquid adjusting pipeline, the liquid adjusting pipeline is communicated with the top of the lower tower and the top of the upper tower, when the liquid level of the lower tower is higher, the control valve controls and adjusts part of liquid to enter the top of the upper tower, and due to the fact that the temperature of the top of the tower is higher, part of the liquid is gasified and is discharged from the top of the tower, and therefore materials in the fractionating tower are reduced, and the liquid level is reduced.
The gaseous oxygen separated from the liquid oxygen separator exchanges energy with other materials in the first heat exchanger, so that the temperature of the gaseous oxygen is increased, the subsequent application requirements are met, the temperature of the first sub-material is further reduced, and the energy consumption of a subsequent separation system is reduced.
Where not mentioned in this application, can be accomplished using or referencing existing technology. The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (8)

1. A deep air separation system, comprising:
the precooling system comprises a supercharger, a supercharging heat exchanger and an expander, and is used for deeply refrigerating the material;
the liquid oxygen evaporator comprises a tower top outlet, a first tower bottom outlet, a second tower bottom outlet, a tower body inlet and a reflux inlet, wherein the tower top outlet is used for discharging separated oxygen, and the first tower bottom outlet is used for discharging liquid oxygen;
the fractionating tower comprises an upper tower, a lower tower and a main cooler arranged at the bottom of the upper tower, the upper tower is positioned at the top of the lower tower, an upper tower exhaust port used for discharging nitrogen and a tower middle inlet communicated with a material outlet of the precooling system are arranged at the top of the upper tower, and a lower tower air inlet is arranged at the lower tower.
2. The deep air separation system of claim 1, wherein the feed is divided into a first sub-feed and a second sub-feed, the first sub-feed enters the pre-cooling system, and the second sub-feed enters the liquid oxygen vaporizer.
3. The deep air separation system of claim 2 wherein the liquid oxygen evaporator is preceded by a first heat exchanger.
4. The deep air separation system of claim 1 wherein the lower column is provided with a lower column outlet, the lower column outlet being in communication with the liquid oxygen vaporizer.
5. The deep air separation system of claim 4 wherein the lower column is further provided with a lower column recycle outlet that is connected to the primary chiller.
6. The deep air separation system of claim 5 wherein the top of the upper column is provided with an upper column recycle outlet in communication with the main chiller.
7. The deep air separation system of claim 6, further comprising a second heat exchanger disposed between the fractionation column and the liquid oxygen vaporizer.
8. The deep air separation system of claim 7, wherein the fractionation column is further provided with a liquid level regulation system comprising a liquid conditioning line and a control valve disposed in the liquid conditioning line.
CN202021673861.3U 2020-08-12 2020-08-12 Deep air separation system Active CN213147125U (en)

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