CN114146541A - Carbon dioxide dehydration and separation equipment - Google Patents

Carbon dioxide dehydration and separation equipment Download PDF

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Publication number
CN114146541A
CN114146541A CN202111657956.5A CN202111657956A CN114146541A CN 114146541 A CN114146541 A CN 114146541A CN 202111657956 A CN202111657956 A CN 202111657956A CN 114146541 A CN114146541 A CN 114146541A
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CN
China
Prior art keywords
ammonia
carbon dioxide
gas
precooler
liquid
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CN202111657956.5A
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Chinese (zh)
Inventor
吴丽嫦
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Maoming Huayue Huayuan Gas Co ltd
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Maoming Huayue Huayuan Gas Co ltd
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Priority to CN202111657956.5A priority Critical patent/CN114146541A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/22—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Gases (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

The invention relates to a dehydration device, in particular to a carbon dioxide dehydration separation device. The carbon dioxide dehydration separation equipment comprises a gas compression device, an ammonia precooling device and a separation device, wherein the gas compression device is connected with an outlet of carbon dioxide feed gas; the ammonia precooling device comprises an ammonia precooler and a liquid ammonia circulating device for providing liquid ammonia for the ammonia precooler, the ammonia precooler is connected with the gas compression device, and the ammonia precooler is connected with the liquid ammonia circulating device; the separation device comprises a gas-liquid separator and a molecular sieve adsorption tower connected with the gas-liquid separator, and the gas-liquid separator is connected with an ammonia precooler. The invention effectively solves the problem that the carbon dioxide feed gas contains a large amount of water vapor, can reduce the moisture in the carbon dioxide feed gas to be within 10ppm, realizes the removal of the moisture in the carbon dioxide feed gas, and enables the subsequent condensation process to be continuously carried out.

Description

Carbon dioxide dehydration and separation equipment
Technical Field
The invention relates to a dehydration device, in particular to a carbon dioxide dehydration separation device.
Background
Carbon dioxide is a well-known gas that is present in the atmosphere. Large amounts of carbon dioxide are released into the atmosphere by fermentation processes, limestone calcination, and all forms of combustion of carbon and carbon compounds. In recent decades, there has been an increasing concern about carbon dioxide emissions due to environmental problems caused by changes in the future climate caused by the greenhouse effect.
Carbon dioxide often coexists with vapor, consequently need the separation to purify and just can obtain pure carbon dioxide, and in current carbon dioxide purification technology, compress the back recondensation with the carbon dioxide feed gas earlier usually, but because the water content is great in the carbon dioxide feed gas, when the condensation is carried out in the condenser that the carbon dioxide feed gas got into next workshop section, moisture in the carbon dioxide feed gas can freeze at the below-zero operating mode, thereby make the phenomenon that ice-blocking appears in the condenser tube bank, and then influence the condensation efficiency of condenser, make and still contain more moisture in the carbon dioxide feed gas that condenses out. In addition, the operator also removes the ice pieces that appear in the condenser tube bundle at intervals, which greatly affects the continuous operation of the condensation process.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a carbon dioxide dehydration separation apparatus, which effectively solves the problem that the carbon dioxide feed gas contains a large amount of water vapor, and the water content in the carbon dioxide feed gas treated by an ammonia pre-cooling device and a separation device is reduced to less than 10ppm, so that the removal of the water content in the carbon dioxide feed gas is realized, and the subsequent condensation process can be continuously performed.
The technical purpose of the invention is realized by the following technical scheme, and the carbon dioxide dehydration and separation equipment comprises:
the gas compression device is connected with an outlet of the carbon dioxide feed gas;
the ammonia precooling device comprises an ammonia precooler and a liquid ammonia circulating device for providing liquid ammonia for the ammonia precooler, the ammonia precooler is connected with the gas compression device, and the ammonia precooler is connected with the liquid ammonia circulating device;
and the separation device comprises a gas-liquid separator and a molecular sieve adsorption tower connected with the gas-liquid separator, and the gas-liquid separator is connected with the ammonia precooler.
In one embodiment, the ammonia precooler is a tube-plate heat exchanger, the tube-side medium of the ammonia precooler is carbon dioxide feed gas, and the shell-side medium of the ammonia precooler is liquid ammonia.
In one embodiment, the liquid ammonia circulating device comprises an ice machine, a condenser and a liquid ammonia tank which are sequentially connected through pipelines, the liquid ammonia tank is connected with a shell-side inlet of the ammonia precooler through a pipeline, and the ice machine is connected with a shell-side outlet of the ammonia precooler through a pipeline.
In one embodiment, air pressure regulating valves are respectively arranged on a pipeline between the liquid ammonia tank and the shell-side inlet of the ammonia precooler and a pipeline between the ice machine and the shell-side outlet of the ammonia precooler.
In one embodiment, a wire mesh defoaming device is further arranged in the gas-liquid separator and is arranged above the inlet of the gas-liquid separator.
In one embodiment, the wire mesh demister comprises a wire mesh demister, an upper fixing piece and a lower fixing piece which are fixed with the inner wall of the gas-liquid separator, the wire mesh demister comprises a plurality of first defoaming nets, the first defoaming nets are obliquely arranged between the upper fixing piece and the lower fixing piece in the same direction, and a second defoaming net is horizontally arranged between the first defoaming nets.
In one embodiment, the first defoaming net and the second defoaming net are formed by overlapping at least two single-layer wire nets.
In one embodiment, the included angle between the first defoaming net and the horizontal plane is 30-80 degrees.
In one embodiment, the molecular sieve adsorption tower is filled with four layers, namely an activated carbon layer, a molecular sieve layer, an inert ceramic ball layer and a stainless steel screen layer from bottom to top.
In one embodiment, a gas detection sensor for monitoring the concentration of carbon dioxide gas is arranged at the outlet of the molecular sieve adsorption tower.
The invention has the advantages that:
(1) the carbon dioxide feed gas enters the ammonia pre-cooling device and exchanges heat with liquid ammonia in the ammonia pre-cooling device, so that most of moisture in the carbon dioxide feed gas is liquefied, and then the carbon dioxide feed gas enters the gas-liquid separator and the molecular sieve adsorption tower to be further dehydrated and dried by the wire mesh defoaming device and the filler, so that the moisture content in the carbon dioxide feed gas is finally reduced to be within 10ppm from about 2000ppm, the moisture in the carbon dioxide feed gas is removed, and the subsequent condensation process can be continuously carried out.
(2) The screen mesh demister greatly increases the contact area of the screen mesh demister and carbon dioxide raw material gas, and effectively prolongs the contact time of the screen mesh demister and the carbon dioxide raw material gas, so that the gas-liquid separation efficiency is improved, and the vaporous liquid in the carbon dioxide raw material gas can be effectively filtered.
(3) The invention adopts the liquid ammonia circulating device to realize the closed circulation of the liquid ammonia, can continuously provide the liquid ammonia for the ammonia precooler and realizes the continuous precooling of the carbon dioxide feed gas.
(4) The molecular sieve adsorption tower is provided with four layers which are sequentially an active carbon layer, a molecular sieve layer, an inert ceramic ball layer and a stainless steel filter screen layer from bottom to top, has extremely strong water adsorption and drying capabilities, and can effectively reduce the water content in the carbon dioxide feed gas from about 100ppm to within 10 ppm.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of an ammonia precooling apparatus according to the present invention;
FIG. 3 is a schematic view showing the structure of a liquid ammonia recycling apparatus according to the present invention;
FIG. 4 is a front view of the wire mesh defoaming device of the present invention;
FIG. 5 is a front view of the wire mesh demister of the present invention;
FIG. 6 is a schematic view of the structure of a molecular sieve adsorption column of the present invention.
In the figure, 1. a gas compression device; 2. an ammonia pre-cooling device; 21. an ammonia precooler; 22. a liquid ammonia circulation device; 221. an ice maker; 222. a condenser; 223. a liquid ammonia tank; 224. an air pressure regulating valve; 3. a gas-liquid separator; 31. a wire mesh defoaming device; 32. a wire mesh demister; 33. an upper fixing member; 34. a lower fixing member; 35. a first defoaming net; 36. a second demister net; 4. a molecular sieve adsorption tower; 41. an activated carbon layer; 42. a molecular sieve layer; 43. an inert ceramic ball layer; 44. a stainless steel screen layer; 5. a gas detection sensor.
Detailed Description
As shown in fig. 1, a carbon dioxide dehydration separation device comprises a gas compression device 1, an ammonia precooling device 2 and a separation device, wherein an inlet of the gas compression device 1 is connected with an outlet of a carbon dioxide raw gas through a pipeline, the ammonia precooling device 2 comprises an ammonia precooler 21 and a liquid ammonia circulating device 22 for supplying liquid ammonia to the ammonia precooler 21, the ammonia precooler 21 is connected with the liquid ammonia circulating device 22, an outlet of the gas compression device 1 is connected with a tube side inlet of the ammonia precooler 21 through a pipeline, the separation device comprises a gas-liquid separator 3 and a molecular sieve adsorption tower 4, a tube side outlet of the ammonia precooler 21 is connected with an inlet of the gas-liquid separator 3 through a pipeline, an inlet of the molecular sieve adsorption tower 4 is connected with an outlet of the gas-liquid separator 3 through a pipeline, and an outlet of the molecular sieve adsorption tower 4 is connected with a next condensation process.
Further, the ammonia precooler 21 is a tube-plate heat exchanger, the tube-pass medium of the ammonia precooler 21 is carbon dioxide feed gas, and the shell pass of the ammonia precooler 21 is liquid ammonia. The size of a connecting pipe connected with the inlet and the outlet of the tube side of the ammonia precooler 21 is DN200, and the material of the connecting pipe is 5083-H112. The size of the connecting pipe connected with the shell-side inlet of the ammonia precooler 21 is DN40, the size of the connecting pipe connected with the shell-side outlet of the ammonia precooler 21 is DN125, and the material of the connecting pipe is 5083-H112. The carbon dioxide feed gas enters the ammonia precooler 21 from a tube-side inlet of the ammonia precooler 21 and flows out from a tube-side outlet of the ammonia precooler 21, liquid ammonia enters from a shell-side inlet of the ammonia precooler 21 and flows out from a shell-side outlet of the ammonia precooler 21 in a gas form, the temperature of the carbon dioxide feed gas is reduced from 30-35 ℃ to about 5 ℃ after heat exchange of the carbon dioxide feed gas by the ammonia precooler 21, and most of moisture in the carbon dioxide feed gas is separated out from the carbon dioxide feed gas in a liquid state.
Further, as shown in fig. 2, liquid ammonia circulation device 22 includes an ice machine 221, a condenser 222, and a liquid ammonia tank 223 connected in sequence by a pipeline, an outlet of liquid ammonia tank 223 is connected to a shell-side inlet of ammonia precooler 21 by a pipeline, and a shell-side outlet of ammonia precooler 21 is connected to ice machine 221 by a pipeline. Air pressure regulating valves 224 are also arranged on a pipeline between the liquid ammonia tank 223 and the shell-side inlet of the ammonia precooler 21 and a pipeline between the ice machine 221 and the shell-side outlet of the ammonia precooler 21. After being compressed and pressurized by the ice maker 221, the gas ammonia enters the condenser 222, is cooled by the condenser 222 to be condensed into liquid ammonia, and then the liquid ammonia enters the liquid ammonia tank 223 through a pipeline to be collected and stored.
Further, the material of the ammonia precooler 21 is stainless steel 304/CS, and the volume capacity of the ammonia precooler 21 is 4.5m3Heat exchange area of 77m2(ii) a The material of the gas-liquid separator 3 is stainless steel 304, and the volume of the gas-liquid separator 3 is 3m3。
Further, a wire mesh defoaming device 31 is further arranged in the gas-liquid separator 3, and the wire mesh defoaming device 31 is arranged above the inlet of the gas-liquid separator 3. The wire mesh defoaming device 31 comprises a wire mesh demister 32, an upper fixing member 33 and a lower fixing member 34 which are fixed with the inner wall of the gas-liquid separator 3, wherein the wire mesh demister 32 comprises a plurality of first defoaming nets 35, the first defoaming nets 35 are obliquely arranged between the upper fixing member 33 and the lower fixing member 34 in the same direction, and the second defoaming nets 36 are horizontally arranged between the first defoaming nets 35.
Further, the included angle between the first defoaming net 35 and the horizontal plane is 30-80 degrees, and the first defoaming net 35 and the second defoaming net 36 are formed by overlapping at least two single-layer silk screens. In the present embodiment, the first defoaming net 35 and the second defoaming net 36 are formed by stacking two single-layer wire nets. Specifically, the wire mesh demister 32 greatly increases the contact area of the carbon dioxide raw gas and the wire mesh, effectively improves the gas-liquid separation efficiency, and effectively plays a role in filtering the mist liquid. The carbon dioxide feed gas precooled by the ammonia precooler 21 enters the gas-liquid separator 3, the carbon dioxide feed gas flows from bottom to top, large liquid drops contained in the gas collide with the first defoaming net 35 and the second defoaming net 36 and can be accumulated on the surfaces of the defoaming nets, when the large liquid drops are accumulated to a certain degree, the accumulated liquid drops slide down along the first defoaming net 35 and the second defoaming net 36 and cannot be carried on the defoaming net layer by the carbon dioxide feed gas in a large amount, and then the function of filtering the atomized liquid is achieved. When the carbon dioxide raw gas passes through the edge around the wire mesh demister 32, the carbon dioxide raw gas mainly passes through the first defoaming net 35 once, and when the carbon dioxide gas passes through the wire mesh demister 32 from the center, the carbon dioxide raw gas passes through the wire mesh demister 32 in a mode of the first defoaming net 35, the second defoaming net 36 and the first defoaming net 35, so that the effect that the carbon dioxide raw gas passes through the wire mesh for multiple times is realized, the contact area and the contact time of the carbon dioxide raw gas with the first defoaming net 35 and the second defoaming net 36 are greatly increased, and the gas-liquid separation efficiency is effectively improved.
Furthermore, the molecular sieve adsorption tower 4 is filled with four layers, which are an activated carbon layer 41, a molecular sieve layer 42, an inert ceramic ball layer 43 and a stainless steel screen layer 44 from bottom to top in sequence, and the molecular sieve layer 42 is a 5A molecular sieve. The molecular sieve adsorption tower 4 is used for further adsorbing and drying moisture in the carbon dioxide feed gas, and can reduce the moisture content in the carbon dioxide feed gas from about 100ppm to within 10 ppm.
Further, the gas compression device 1 is a carbon dioxide compressor.
Further, a gas detection sensor 5 for monitoring the concentration of carbon dioxide gas is provided at the outlet of the molecular sieve adsorption tower 4.
The working principle of the invention is as follows: the pressure of carbon dioxide at the outlet of the carbon dioxide feed gas is 2.5MPa, the temperature is 30-35 ℃, the carbon dioxide feed gas firstly enters a gas compression device 1 for compression, then enters an ammonia pre-cooling device 2 for heat exchange with liquid ammonia in the ammonia pre-cooling device 2, the temperature of the carbon dioxide feed gas is reduced to about 5 ℃ from 30-35 ℃ after heat exchange, most of moisture in the carbon dioxide feed gas is liquefied, most of water vapor in the carbon dioxide feed gas is condensed into condensed water, the moisture content in the carbon dioxide feed gas is reduced to about 100ppm from about 2000ppm, then the carbon dioxide feed gas enters a gas-liquid separator 3, a mist liquid is removed by a defoaming device 31 through a silk screen, then the carbon dioxide feed gas enters a molecular sieve adsorption tower 4 for further drying and adsorption, the moisture content in the carbon dioxide feed gas is reduced to within 10ppm, and thus the moisture in the carbon dioxide feed gas is removed, the condition that the condenser tube bundle is blocked by ice in the subsequent process of condensing the carbon dioxide feed gas is avoided.
It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.

Claims (10)

1. A carbon dioxide dehydration separation apparatus, comprising:
the device comprises a gas compression device (1), wherein the gas compression device (1) is connected with an outlet of carbon dioxide raw gas;
the ammonia pre-cooling device (2) comprises an ammonia pre-cooler (21) and a liquid ammonia circulating device (22) for providing liquid ammonia for the ammonia pre-cooler (21), the ammonia pre-cooler (21) is connected with the gas compression device (1), and the ammonia pre-cooler (21) is connected with the liquid ammonia circulating device (22);
the separation device comprises a gas-liquid separator (3) and a molecular sieve adsorption tower (4) connected with the gas-liquid separator (3), and the gas-liquid separator (3) is connected with the ammonia precooler (21).
2. The carbon dioxide dehydration separation device according to claim 1, wherein the ammonia precooler (21) is a tube-plate heat exchanger, the tube-side medium of the ammonia precooler (21) is the carbon dioxide feed gas, and the shell-side medium of the ammonia precooler (21) is liquid ammonia.
3. The carbon dioxide dehydration separation apparatus according to claim 1, wherein said liquid ammonia circulation device (22) comprises an ice maker (221), a condenser (222) and a liquid ammonia tank (223) which are connected in sequence by a pipeline, said liquid ammonia tank (223) is connected with a shell-side inlet of said ammonia precooler (21) by a pipeline, and said ice maker (221) is connected with a shell-side outlet of said ammonia precooler (21) by a pipeline.
4. The carbon dioxide dehydration separation apparatus according to claim 3, characterized in that a gas pressure regulating valve (224) is provided on a pipeline between the liquid ammonia tank (223) and the shell-side inlet of the ammonia precooler (21) and on a pipeline between the ice maker (221) and the shell-side outlet of the ammonia precooler (21), respectively.
5. The carbon dioxide dehydration separation apparatus according to claim 1, characterized in that a wire mesh defoaming device (31) is further provided in the gas-liquid separator (3), and the wire mesh defoaming device (31) is provided above an inlet of the gas-liquid separator (3).
6. The carbon dioxide dehydrating and separating apparatus according to claim 5, wherein the wire mesh demister (31) includes a wire mesh demister (32) and an upper fixing member (33) and a lower fixing member (34) fixed to an inner wall of the gas-liquid separator (3), the wire mesh demister (32) includes a first defoaming net (35), the first defoaming net (35) is provided in plurality, the first defoaming net (35) is obliquely provided in plurality between the upper fixing member (34) and the lower fixing member (34) in the same direction, and a second defoaming net (36) is horizontally provided between the first defoaming nets (35).
7. The carbon dioxide dehydration separation apparatus according to claim 6, characterized in that said first defoaming net (35) and said second defoaming net (36) are superimposed by at least two single-layer wire nets.
8. The carbon dioxide dehydration and separation apparatus according to claim 6, wherein the angle between the first defoaming net (35) and the horizontal plane is 30-80 °.
9. The carbon dioxide dehydration separation device according to claim 1, characterized in that the molecular sieve adsorption tower (4) is filled with four layers, which are an activated carbon layer (41), a molecular sieve layer (42), an inert ceramic ball layer (43) and a stainless steel screen layer (44) from bottom to top.
10. The carbon dioxide dehydration separation apparatus according to claim 1, characterized in that a gas detection sensor (5) for monitoring a carbon dioxide gas concentration is provided at an outlet of the molecular sieve adsorption tower (4).
CN202111657956.5A 2021-12-30 2021-12-30 Carbon dioxide dehydration and separation equipment Pending CN114146541A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111657956.5A CN114146541A (en) 2021-12-30 2021-12-30 Carbon dioxide dehydration and separation equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111657956.5A CN114146541A (en) 2021-12-30 2021-12-30 Carbon dioxide dehydration and separation equipment

Publications (1)

Publication Number Publication Date
CN114146541A true CN114146541A (en) 2022-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111657956.5A Pending CN114146541A (en) 2021-12-30 2021-12-30 Carbon dioxide dehydration and separation equipment

Country Status (1)

Country Link
CN (1) CN114146541A (en)

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