CN114768422A - Method and equipment for removing impurities by using gaseous carbon dioxide - Google Patents
Method and equipment for removing impurities by using gaseous carbon dioxide Download PDFInfo
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- CN114768422A CN114768422A CN202210435705.0A CN202210435705A CN114768422A CN 114768422 A CN114768422 A CN 114768422A CN 202210435705 A CN202210435705 A CN 202210435705A CN 114768422 A CN114768422 A CN 114768422A
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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
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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
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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
- B01D53/26—Drying gases or vapours
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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
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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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
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The application provides a method and equipment for removing impurities from gaseous carbon dioxide. The method comprises the steps of conveying a raw material gas to be purified to a compression device for secondary compression treatment to obtain a secondary compressed gas, wherein the raw material gas to be purified comprises carbon dioxide gas and various impurities to be treated; conveying the secondary compressed gas to a secondary impurity removal device for secondary impurity removal treatment to obtain secondary impurity removal gas; conveying the secondary impurity-removed gas to a compression device for carrying out tertiary compression treatment to obtain tertiary compressed gas; and conveying the three-stage compressed gas to a three-stage impurity removal device for three-stage impurity removal treatment to obtain carbon dioxide gas. The raw gas to be purified is subjected to secondary compression, the boiling point of impurities is reduced, main organic impurities and water in the raw gas to be purified are removed by the secondary impurity removal device conveniently, then pressurization is carried out again, the boiling point of the impurities is further increased, the remaining organic impurities are further removed conveniently, and the purity of carbon dioxide gas is effectively improved.
Description
Technical Field
The invention relates to the technical field of gas treatment, in particular to a method and equipment for removing impurities from gaseous carbon dioxide.
Background
As carbon dioxide is used as a valuable resource which can be utilized, the method is widely applied to various fields such as chemical industry, food industry, mechanical processing, oil exploitation and the like, so that the recycling is an important method for reducing the emission of the carbon dioxide, and the preparation of industrial-grade and food-grade carbon dioxide in the recycling method is a more successful method, and a large number of industrialized systems exist. In most of the industrial systems, pressure swing adsorption decarburization vent gas in the process of producing hydrogen from coal, synthesizing ammonia or methanol is used as a raw material, and liquid carbon dioxide is prepared by the procedures of compression, impurity removal, purification, drying, liquefaction, purification and the like.
However, products produced by the traditional carbon dioxide impurity removal equipment often contain higher hydrocarbons, aldehydes and other substances, the quality of the carbon dioxide is influenced, the standards of the food-grade carbon dioxide cannot be met, and the food-grade carbon dioxide has higher value compared with industrial-grade carbon dioxide.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method and equipment for removing impurities from gaseous carbon dioxide, which can effectively improve the purity of carbon dioxide gas.
The purpose of the invention is realized by the following technical scheme:
a gaseous carbon dioxide abatement process, the process comprising:
conveying a raw material gas to be purified to a compression device for secondary compression treatment to obtain a secondary compressed gas, wherein the raw material gas to be purified comprises carbon dioxide gas and various impurities to be treated;
conveying the secondary compressed gas to a secondary impurity removal device for secondary impurity removal treatment to obtain secondary impurity removal gas;
conveying the secondary impurity-removed gas to the compression device for tertiary compression treatment to obtain tertiary compressed gas;
and conveying the three-stage compressed gas to a three-stage impurity removal device for three-stage impurity removal treatment to obtain carbon dioxide gas.
In one embodiment, the conveying the secondary compressed gas to a secondary impurity removal device for secondary impurity removal processing to obtain a secondary compressed gas includes: and conveying the secondary compressed gas to a coarse impurity remover for coarse impurity removal treatment to obtain a first treated gas.
In one embodiment, the rough impurity remover comprises a rough impurity removing shell, a dry adsorption layer and an organic adsorption layer, the dry adsorption layer and the organic adsorption layer are arranged in the rough impurity removing shell in a layered mode, the rough impurity removing shell is provided with a first air inlet hole and a first air outlet hole, the first air inlet hole is used for leading in the secondary compressed gas, and the first air outlet hole is used for leading out the first processing gas.
In one embodiment, the conveying the secondary compressed gas to a coarse impurity remover for performing a coarse impurity removal treatment to obtain a first processed gas, and then further comprising: and conveying the first treatment gas to a de-hydrocarbon device for de-hydrocarbon treatment to obtain a second treatment gas.
In one embodiment, the hydrocarbon removing device comprises a hydrocarbon removing shell, a preheating part, a heating part and a reaction part, wherein the preheating part, the heating part and the reaction part are all located in the hydrocarbon removing shell, the preheating part, the heating part and the reaction part are sequentially connected, the hydrocarbon removing shell is provided with a second air inlet hole and a second air outlet hole, the second air inlet hole is used for guiding the first processing gas to the preheating part, and the second air outlet hole is used for guiding out the second processing gas output by the reaction part.
In one embodiment, the step of delivering the first processing gas to a de-hydrocarbon device for de-hydrocarbon processing to obtain a second processing gas further comprises: and conveying the second processing gas to a regeneration impurity remover for regeneration impurity removal treatment to obtain a third processing gas.
In one embodiment, the conveying the second processing gas to a regeneration trash separator for performing renewable trash removal processing to obtain a third processing gas, and then further includes: and conveying the third processing gas to a coarse filter for coarse filtration to obtain the secondary impurity-removed gas.
In one embodiment, the conveying the three-stage compressed gas to a three-stage impurity removal device for performing three-stage impurity removal treatment to obtain carbon dioxide gas includes: and conveying the third-stage compressed gas to a fine impurity remover for fine impurity removal treatment to obtain fourth treated gas.
In one embodiment, the conveying the three-stage compressed gas to a fine impurity remover for fine impurity removal processing to obtain a fourth processed gas, and then further comprising: and conveying the fourth processing gas to a fine filter for fine filtration to obtain the carbon dioxide gas.
A gaseous carbon dioxide abatement apparatus comprising: the device comprises a compression device, a secondary impurity removal device and a tertiary impurity removal device; the first gas inlet of the compression device is used for leading in raw gas to be purified, the compression device is used for carrying out secondary compression treatment on the raw gas to be purified to obtain secondary purified gas, and the first gas outlet of the compression device is used for leading out the secondary compressed gas; an input port of the secondary impurity removal device is communicated with a first gas outlet of the compression device, an output port of the secondary impurity removal device is communicated with a second gas inlet of the compression device, and the secondary impurity removal device is used for performing three-stage compression treatment on secondary impurity removal gas output by the secondary impurity removal device to obtain three-stage compressed gas; and the input port of the third-stage impurity removal device is communicated with the second gas outlet of the compression device and is used for carrying out third-stage impurity removal treatment on the third-stage compressed gas to obtain carbon dioxide gas, and the output port of the third-stage impurity removal device is used for outputting the carbon dioxide gas.
Compared with the prior art, the invention has at least the following advantages:
the method comprises the following steps of compressing a raw material gas to be purified in a secondary mode to reduce the boiling points of various impurities in the raw material gas to be purified, removing main organic impurities and water in the raw material gas to be purified by a secondary impurity removing device conveniently to obtain secondary impurity removing gas, then pressurizing the secondary impurity removing gas again to further improve the gas pressure, further reducing the boiling points of various impurities in the secondary impurity removing gas, further removing the residual organic impurities by a tertiary impurity removing device conveniently, effectively improving the content percentage of carbon dioxide gas and further improving the purity of the carbon dioxide gas.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow diagram of a gaseous carbon dioxide abatement process in an embodiment;
FIG. 2 is a schematic diagram of a gaseous carbon dioxide abatement apparatus in an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention relates to a method for removing impurities by using gaseous carbon dioxide. In one embodiment, the gaseous carbon dioxide impurity removal method comprises the steps of conveying a raw material gas to be impurity removed to a compression device for secondary compression treatment to obtain a secondary compressed gas, wherein the raw material gas to be impurity removed comprises carbon dioxide gas and a plurality of impurities to be treated; conveying the secondary compressed gas to a secondary impurity removal device for secondary impurity removal treatment to obtain secondary impurity removal gas; conveying the secondary impurity-removed gas to the compression device for tertiary compression treatment to obtain tertiary compressed gas; and conveying the three-stage compressed gas to a three-stage impurity removal device for three-stage impurity removal treatment to obtain carbon dioxide gas. The method comprises the following steps of compressing a raw material gas to be purified in a secondary mode to reduce the boiling points of various impurities in the raw material gas to be purified, removing main organic impurities and water in the raw material gas to be purified by a secondary impurity removing device conveniently to obtain secondary impurity removing gas, then pressurizing the secondary impurity removing gas again to further improve the gas pressure, further reducing the boiling points of various impurities in the secondary impurity removing gas, further removing the residual organic impurities by a tertiary impurity removing device conveniently, effectively improving the content percentage of carbon dioxide gas and further improving the purity of the carbon dioxide gas.
Please refer to fig. 1, which is a flowchart illustrating a method for removing impurities from gaseous carbon dioxide according to an embodiment of the present invention. The gaseous carbon dioxide impurity removal method comprises part or all of the following steps. Please refer to fig. 2, which is a schematic structural diagram of a gaseous carbon dioxide impurity removing apparatus according to an embodiment of the present invention.
S100: and conveying the raw material gas to be purified to a compression device 100 for secondary compression treatment to obtain secondary compressed gas, wherein the raw material gas to be purified comprises carbon dioxide gas and various impurities to be treated.
In this embodiment, the raw gas to be purified is used as a raw gas containing carbon dioxide input from the outside, and the main component of the raw gas to be purified is gaseous carbon dioxide and part of impurities, where the gaseous carbon dioxide is a substance that needs to be finally recovered and the impurities need to be removed. The impurities in the feed gas to be purified comprise at least one of methane, ethylene, trace benzene, methanol, ethylene oxide, vinyl chloride and moisture, and the impurities and the gaseous carbon dioxide are different chemical substances, so that the boiling point difference exists between the impurities and the gaseous carbon dioxide. The method comprises the steps of conveying a raw material gas to be purified to a compression device 100 for secondary compression treatment, namely pressurizing each component in the raw material gas to be purified, specifically, the pressure of the secondary compression treatment is 1.0MPA, so that the pressure of the secondary compressed gas output by the compression device 100 is 1.0 MPA. Like this, under compression device 100's pressurization, treat the self pressure increase of each component in the edulcoration feed gas, make treat that the physical properties of each component in the edulcoration feed gas changes, thereby make treat that the boiling point of impurity reduces in the edulcoration feed gas, and then make treat that partial impurity liquefaction in the edulcoration feed gas is convenient for follow-up is in be got rid of in the secondary impurity removal device to improve the gaseous carbon dioxide's that final production came out pure degree. The liquefaction pressure of the gaseous carbon dioxide is greater than 73 standard atmospheric pressures, namely the liquefaction pressure of the gaseous carbon dioxide is at least 7.3MPA, and the liquefaction pressure of the impurities in the feed gas to be purified is obviously different, so that the carbon dioxide in the feed gas to be purified can be kept in a gaseous state, and the impurities mixed in the gaseous carbon dioxide can be conveniently removed.
S200: and conveying the secondary compressed gas to a secondary impurity removal device 200 for secondary impurity removal treatment to obtain secondary impurity removal gas.
In this embodiment, the secondary compressed gas is a gas obtained by compressing the raw material gas to be purified by the compression device 100, and after the compression device 100 is pressurized, the secondary compressed gas is mixed with partially liquefied impurities in addition to the main gaseous carbon dioxide, and the liquefied impurities are liquid beads with small particle size, suspended in the gaseous carbon dioxide and passing through the secondary purification device 200. The second-stage compressed gas is guided into the second-stage impurity removal device 200 through the output end of the compression device 100, the second-stage impurity removal treatment of the second-stage compressed gas is achieved, namely, the coarse impurity removal of the second-stage compressed gas is achieved, the second-stage impurity removal device 200 adsorbs liquefied impurities in the second-stage compressed gas, so that part of impurities in the second-stage compressed gas are intercepted by the second-stage impurity removal device 200, the removal of part of impurities in the raw gas to be subjected to impurity removal is facilitated, the impurity content in the second-stage impurity removal gas is reduced, and the purity of gaseous carbon dioxide in the second-stage impurity removal gas is improved.
S300: and conveying the secondary impurity-removed gas to the compression device 100 for tertiary compression treatment to obtain tertiary compressed gas.
In this embodiment, the secondary impurity-removed gas is a gas subjected to the secondary impurity removal, and the content of impurities in the secondary impurity-removed gas is relatively reduced, that is, the content of impurities in the secondary impurity-removed gas is less than the content of impurities in the raw gas to be impurity-removed. The impurities in the secondary purge gas are removed by the self-liquefaction characteristic, but some impurities are not completely removed, for example, the compression time of the compression device 100 is too short, so that the impurities in the secondary purge gas are not completely liquefied. At this time, the secondary impurity-removed gas is conveyed to the compression device 100 to be subjected to a tertiary compression treatment, and the secondary impurity-removed gas is compressed by using a higher pressure, specifically, the compression pressure of the tertiary compression treatment is 2.6 MPA. In this way, the secondary impurity-removed gas is compressed again to further increase the pressure of the secondary impurity-removed gas, so that the boiling point of the impurities which are not removed in the secondary impurity-removed gas is further reduced, the impurities which are not removed in the secondary impurity-removed gas are more easily liquefied, the content of the impurities which are liquefied in the secondary impurity-removed gas is increased, and the impurities which are not removed in the tertiary compressed gas are more conveniently removed subsequently.
S400: and conveying the three-stage compressed gas to a three-stage impurity removal device 300 for three-stage impurity removal treatment to obtain carbon dioxide gas.
In this embodiment, the three-stage compressed gas is a gas subjected to the three-stage compression process, and after the two-stage compressed gas is pressurized in the compression device 100, the three-stage compressed gas is mixed with liquefied impurities that are not removed in the two-stage impurity removal process, and the liquefied impurities are liquid beads with small particle sizes, and are also suspended in the gaseous carbon dioxide and pass through the three-stage impurity removal device 300. The three-stage compressed gas is guided into the three-stage impurity removal device 300 through the output end of the compression device 100, the three-stage impurity removal processing of the three-stage compressed gas is achieved, namely, the fine impurity removal of the three-stage compressed gas is achieved, the three-stage impurity removal device 300 adsorbs liquefied impurities in the three-stage compressed gas, so that part of impurities in the three-stage compressed gas are intercepted by the three-stage impurity removal device 300, the part of impurities in the raw gas to be subjected to impurity removal is convenient to further remove, the impurity content in the two-stage impurity removal gas is reduced, and the purity of finally obtained carbon dioxide is further improved.
In the above embodiment, treat that the edulcoration feed gas is through the second grade compression for the boiling point of treating various impurity in the edulcoration feed gas reduces, the secondary edulcoration device 200 of being convenient for will treat that main organic matter impurity and moisture in the edulcoration feed gas clear away, in order to obtain the second grade edulcoration gas, later pressurize the second grade edulcoration gas once more, further improve gas pressure, thereby further reduce the boiling point of each impurity in the second grade edulcoration gas, thereby be convenient for tertiary edulcoration device 300 further to clear away remaining organic matter impurity, the content percentage of carbon dioxide gas has been improved effectively, thereby the purity of carbon dioxide gas has been improved effectively. Wherein, the two-stage compression and the three-stage compression of the gas also facilitate the transportation of the gas.
In one embodiment, the conveying the secondary compressed gas to the secondary impurity removal device 200 for secondary impurity removal processing to obtain a secondary compressed gas includes: and conveying the secondary compressed gas to a coarse impurity remover 210 for coarse impurity removal treatment to obtain a first treated gas. In this embodiment, the secondary compressed gas is a gas obtained by compressing the raw material gas to be purified by the compression device 100, and after the compression device 100 is pressurized, the secondary compressed gas is mixed with partially liquefied impurities in addition to the main gaseous carbon dioxide, and the liquefied impurities are liquid beads with small particle size, suspended in the gaseous carbon dioxide and passing through the secondary purification device 200. The second grade compressed gas passes through compressor arrangement 100's output direction in the thick edulcorator 210, thick edulcorator 210 will pass through the impurity that the second grade compressed gas was handled carries out the roughness edulcoration and handles, makes liquefied impurity in the second grade compressed gas by thick edulcorator 210 adsorbs, and carbon dioxide directly passes through, is convenient for improve the purity of the carbon dioxide in the second grade compressed gas, thereby makes carbon dioxide content percentage in the first process gas is greater than treat the carbon dioxide content percentage in the edulcoration feed gas, and then has improved the purity of gaseous carbon dioxide in the first process gas.
Furthermore, the coarse impurity remover comprises a coarse impurity removing shell, a dry adsorption layer and an organic adsorption layer, the dry adsorption layer and the organic adsorption layer are arranged in the coarse impurity removing shell in a layered mode, a first air inlet hole and a first air outlet hole are formed in the coarse impurity removing shell, the first air inlet hole is used for leading in the secondary compressed gas, and the first air outlet hole is used for leading out the first processing gas. In this embodiment, the coarse impurity remover performs coarse impurity removal processing on the secondary compressed gas, the secondary compressed gas is the gas obtained by compressing the raw material gas to be purified by the compression device, and after the compression device pressurizes the secondary compressed gas, the secondary compressed gas is mixed with partially liquefied impurities in addition to main gaseous carbon dioxide, and the liquefied impurities are liquid beads with small particle size, are suspended in the gaseous carbon dioxide, and are sent into the coarse impurity remover. The gaseous carbon dioxide in the secondary compressed gas is mixed with the liquefied impurities and enters the coarse impurity remover together, the gaseous carbon dioxide can pass through the dry adsorption layer and the organic adsorption layer in turn, and the liquid impurities mixed in the gaseous carbon dioxide are absorbed by the dry adsorption layer and the organic adsorption layer, respectively, specifically, the first air inlet is positioned at the bottom of the coarse impurity removal shell, the second air inlet is positioned at the top of the coarse impurity removal shell, the dry adsorption layer is arranged at the lower layer, the organic adsorption layer is arranged at the upper layer, the secondary compressed gas passes through the first air inlet hole and firstly passes through the dry adsorption layer, the water content in the secondary compressed gas is liquefied, namely water mist, is absorbed by the drying and adsorbing layer, and part of impurities in the secondary compressed gas are effectively removed; and then, the secondary compressed gas continuously flows upwards, the secondary compressed gas flows through the organic adsorption layer, and part of organic matters liquefied in the secondary compressed gas are absorbed by the organic adsorption layer, so that part of organic matter impurities in the secondary compressed gas are removed, the content percentage of carbon dioxide in the secondary compressed gas is increased, and the purity of the carbon dioxide in the secondary compressed gas is improved. In another embodiment, the material of the dry adsorption layer is activated alumina, that is, the dry adsorption layer is a small amount of filled activated alumina layer, the activated alumina layer has a spherical structure with a diameter of 5mm, the material of the organic adsorption layer is activated carbon, that is, the organic adsorption layer is activated carbon filled with coal, and the activated carbon has a columnar structure with a diameter of 5 mm.
In one embodiment, the delivering the secondary compressed gas to the rough trash remover 210 for performing rough trash removal processing to obtain a first processed gas, and then further includes: the first processing gas is sent to a de-hydrocarbon unit 220 for de-hydrocarbon processing, so as to obtain a second processing gas. In this embodiment, the first processing gas is the second-stage compressed gas after being processed by the coarse impurity remover 210, the percentage of the carbon dioxide in the first processing gas is increased, and the coarse impurity remover 210 removes part of impurities in the second-stage compressed gas, that is, the coarse impurity remover 210 removes part of moisture and organic matters in the second-stage compressed gas. The first process gas is mainly gaseous carbon dioxide, and part of the hydrocarbons, which are liquefied in the secondary compression process, but a greater part of the hydrocarbons pass through the coarse impurity remover 210. In this way, by performing the hydrocarbon removal treatment on the first treatment gas, hydrocarbon impurities in the first treatment gas can be effectively removed, so that the percentage of carbon dioxide in the second treatment gas is further increased, and the purity of carbon dioxide in the second treatment gas is further improved.
Further, the hydrocarbon removing device comprises a hydrocarbon removing shell, a preheating piece, a heating piece and a reaction piece, wherein the preheating piece, the heating piece and the reaction piece are all located in the hydrocarbon removing shell, the preheating piece, the heating piece and the reaction piece are sequentially connected, a second air inlet hole and a second air outlet hole are formed in the hydrocarbon removing shell, the second air inlet hole is used for guiding the first processing gas to the preheating piece, and the second air outlet hole is used for guiding the second processing gas output by the reaction piece out. In this embodiment, the first processing gas enters through the second gas inlet hole on the casing, the first processing gas first contacts the preheating element to increase the reaction temperature of the hydrocarbons in the first processing gas, and then the first processing gas passes through the heating element, so that the temperature of the hydrocarbons in the first processing gas reaches the specified reaction temperature, which helps the reaction element catalyze the reaction of the hydrocarbons in the first processing gas, so that the hydrocarbons in the first processing gas are removed after the reaction in the reaction element, and further the purity of the carbon dioxide in the second processing gas is further increased. The reaction part comprises a catalytic layer and two protective layers, wherein the catalytic layer is positioned between the two protective layers and is made of precious metals such as palladium and platinum taking alumina as a carrier, and specifically, the total percentage of the palladium and the platinum accounts for 0.15% of the catalytic layer; the protective layer is made of ceramic, and specifically, the protective layer is of a ceramic sphere structure with the diameter of 8-10 mm.
In one embodiment, the delivering the first processing gas to the de-hydrocarbon unit 220 for de-hydrocarbon treatment to obtain a second processing gas further comprises: and conveying the second processing gas to a regeneration impurity remover 230 for regeneration impurity removal treatment to obtain a third processing gas. In this embodiment, the second processing gas is a gas obtained by processing the first processing gas by the hydrocarbon remover 220, and the content of impurities in the second processing gas is less than that of the first processing gas, i.e. the content percentage of gaseous carbon dioxide in the second processing gas is greater than that of gaseous carbon dioxide in the first processing gas. Although the second processing gas is processed by the dealkylation, a part of impurities in the second processing gas cannot be absorbed completely for removal, that is, the adsorption removal capability of the coarse impurity remover 210 is limited, and the impurities which cannot be absorbed completely by the coarse impurity remover 210 need to be removed again. The impurities in the second process gas are mainly water, and the remainder is a trace amount of organic substances or organic compounds, such as benzene, methanol, ethylene oxide, and vinyl chloride. In this way, when the renewable impurity removal treatment is performed on the second processing gas, the moisture, the trace organic matters or the organic compounds of the second processing gas are adsorbed and removed, so that the impurities in the second processing gas can be further removed, and the purity of the carbon dioxide in the third processing gas can be further improved.
Further, the conveying the second processing gas to a regeneration impurity remover 230 for performing renewable impurity removal processing to obtain a third processing gas, and then further includes: and conveying the third processing gas to a coarse filter 240 for coarse filtration to obtain the secondary impurity-removed gas. In this embodiment, the third processing gas is obtained by the regeneration impurity remover 230, that is, the third processing gas is obtained by the regeneration impurity removing treatment of the second processing gas. Although the third processing gas is sequentially processed by the coarse impurity remover 210, the hydrocarbon remover 220 and the regeneration impurity remover 230, powder or dust in the impurity removers, i.e. chips in various impurity removing layers, is carried in the third processing gas, and the impurities are attached to the impurity removers and need to be removed. Like this, third process gas follows after deriving in the regeneration edulcorator 230, third process gas still need pass through coarse filter 240 is right third process gas carries out the coarse filtration is handled, is convenient for with powder or dust in the third process gas are clear away to be convenient for further reduce impurity content in the third process gas, and then be convenient for further improve the purity of gaseous carbon dioxide in the third process gas.
In one embodiment, the conveying the three-stage compressed gas to a three-stage impurity removal device 300 for performing three-stage impurity removal processing to obtain carbon dioxide gas includes: and conveying the third-stage compressed gas to a fine impurity remover 310 for fine impurity removal treatment to obtain a fourth treated gas. In this embodiment, the three-stage compressed gas is a gas subjected to the three-stage compression treatment, and after the two-stage compressed gas is pressurized in the compression device 100, the three-stage compressed gas contains mainly gaseous carbon dioxide and liquefied impurities that are not removed in the two-stage impurity removal treatment, and the liquefied impurities are liquid beads with small particle sizes, and are also suspended in the gaseous carbon dioxide and pass through the three-stage impurity removal device 300. The tertiary impurity removal device 300 comprises the fine impurity remover 310, wherein the tertiary compressed gas passes through the fine impurity remover 310 and is used for carrying out the fine impurity removal treatment on the tertiary compressed gas. After the three-stage compressed gas is subjected to the secondary compression by the compression device 100, the pressure of the three-stage compressed gas is further increased, so that the boiling point of the impurities which are not liquefied in the three-stage compressed gas is further reduced, the remaining impurities which are not removed in the three-stage compressed gas are liquefied, the liquefied impurities in the three-stage compressed gas are conveniently sent to the refined impurity remover 310 for refined impurity removal, further more impurities in the three-stage compressed gas are conveniently removed, and the purity of gaseous carbon dioxide in the three-stage compressed gas is effectively improved. The fine impurity remover 310 and the coarse impurity remover 210 progressively remove impurities from the raw material gas to be removed, specifically, the structure of the adsorption layer in the fine impurity remover 310 is the same as that of the adsorption layer in the coarse impurity remover 210, the specific surface area of the adsorption layer in the fine impurity remover 310 is larger than that of the adsorption layer in the coarse impurity remover 210, the adsorption layer in the coarse impurity remover 210 is used for removing impurities with high concentration from the raw material gas to be removed, the adsorption layer in the fine impurity remover 310 is used for removing impurities with low concentration from the raw material gas to be removed, that is, the adsorption layer in the coarse impurity remover 210 is more suitable for removing impurities with high concentration from the raw material gas to be removed, and the adsorption layer in the fine impurity remover 310 is more suitable for removing impurities with low concentration from the raw material gas to be removed, so that under different pressures, the impurity concentrations in the gas are different, so that the impurity removal treatment is performed on the impurities in different stages by the coarse impurity remover 210 and the fine impurity remover 310, and the purity of gaseous carbon dioxide in the fourth treatment gas is further improved.
Further, the third-stage compressed gas is conveyed to a fine impurity remover 310 for fine impurity removal processing to obtain a fourth processed gas, and then the method further includes: and conveying the fourth processing gas to a fine filter 320 for fine filtration to obtain the carbon dioxide gas. In this embodiment, the fourth processing gas is a gas passing through the refined impurity remover 310, that is, the fourth processing gas is a gas obtained through the refined impurity removing process, and impurities in the fourth processing gas are further removed, so that the impurities in the fourth processing gas including organic matters and organic compounds are conveniently removed. In this way, at this time, the impurities in the fourth processing gas are substantially removed, but only the powder or dust mixed in the fourth processing gas after passing through the fine impurity remover 310 is transferred to the fine filter 320, and the fine filtering process is performed on the fourth processing gas, so as to remove the powder or dust in the fourth processing gas, thereby removing the impurities remaining in the fourth processing gas, and further improving the purity of the carbon dioxide in the finally obtained gas. In another embodiment, the purity of the carbon dioxide in the carbon dioxide gas is 99.999% to 99.9999%, the fine impurity remover 310 has the same structure as the coarse impurity remover 210, that is, the fine impurity remover 310 also includes a dry adsorption layer and an organic adsorption layer inside, the dry adsorption layer of the fine impurity remover 310 is made of activated alumina, that is, the dry adsorption layer of the fine impurity remover 310 is a small amount of activated alumina layer, the activated alumina layer is a spherical structure with a diameter of 3mm, the organic adsorption layer of the fine impurity remover 310 is made of activated carbon, that is, the organic adsorption layer of the fine impurity remover 310 is filled with coal-based activated carbon, and the activated carbon is a columnar structure with a diameter of 3 mm.
In one embodiment, the delivering the fourth processing gas to a fine filter 320 for fine filtering to obtain the carbon dioxide gas, and then further includes: and sequentially carrying out fine filtration treatment, liquefaction treatment and purification treatment on the carbon dioxide gas to obtain liquid carbon dioxide. In this embodiment, gaseous carbon dioxide passes through fine filter 320, liquefying plant 330 and purification device 340 in proper order, fine filter 320 adopts the stainless steel mesh to make the skeleton, and still adopts food level non-woven fabrics to do the filter core moreover, and the filter core is 600 meshes, is convenient for carry out meticulous cleaing away to remaining impurity in the gaseous carbon dioxide. The liquefaction device 330 is used for liquefying the carbon dioxide gas phase passing through the fine filter 320, so that the gas carbon dioxide is converted into liquid carbon dioxide, and after the extraction processing of the purification device 340, the final pure liquid carbon dioxide is obtained, so that the liquid carbon dioxide is stored in the storage tank 350.
It is understood that the second process gas is a gas obtained through the dealkylator 220, the dealkylator 220 is a gas obtained through the dealkylator 220 by means of a reaction with hydrocarbons in the second process gas, and there is a redox reaction to remove the hydrocarbons in the second process gas by forming sulfur hydrocarbons from the hydrocarbons and sulfur, so that a part of unreacted sulfur is mixed in the second process gas, and new impurities are mixed in the second process gas, resulting in an increase in impurities in the second process gas.
In order to avoid generating new impurities, the second processing gas is conveyed to a regeneration impurity remover to be subjected to renewable impurity removal treatment to obtain a third processing gas, and the method comprises the following steps:
carrying out organic impurity removal treatment on the second treatment gas to obtain sulfur-rich treatment gas;
and carrying out regeneration impurity removal treatment on the sulfur-rich treatment gas to obtain a third treatment gas.
In this embodiment, the impurity removing device that regenerates includes regeneration edulcoration casing, removes miscellaneous piece organically and regeneration removes miscellaneous piece, remove miscellaneous piece organically and the regeneration removes miscellaneous piece and all is located in the regeneration edulcoration casing, remove miscellaneous piece organically the input with the air inlet intercommunication of regeneration edulcoration casing, remove miscellaneous piece organically the output with the regeneration removes miscellaneous input and connects, the regeneration remove miscellaneous piece the output with the gas outlet intercommunication of regeneration edulcoration casing, wherein, organic edulcoration piece is including first dry layer, the dry layer of second, sulphur removal layer and the dry layer of third that the stromatolite set up in proper order. The first drying layer is firstly contacted with the second processing gas, namely the first drying layer is arranged close to the gas inlet of the regeneration impurity removal shell, and then the first drying layer, the sulfur removal layer and the third drying layer sequentially pass through the second drying layer, the second drying layer and the third drying layer, and the first drying layer, the second drying layer and the third drying layer carry out three-stage drying and impurity removal on the second processing gas, so that the moisture in the second processing gas can be removed as much as possible, and the content of the moisture in the second processing gas can be effectively reduced. The sulfur removal layer is located between the second drying layer and the third drying layer, and the sulfur removal layer performs a sulfur removal operation on the gas obtained by primary drying of the second processing gas, so as to facilitate absorption of sulfur in the second processing gas, specifically, the sulfur removal layer reacts with sulfur in the second processing gas to form solid sulfide, so that sulfur in the second processing gas is trapped in the regeneration impurity remover, the probability of sulfur or sulfide in the third processing gas is reduced, and the probability of new impurities in the third processing gas is reduced.
Further, in order to prolong the service life of the regeneration impurity remover, the method comprises the following steps:
acquiring the ventilation time of the second processing gas;
performing time fusion processing on the ventilation time and preset time to obtain a ventilation fusion difference value;
detecting whether the ventilation fusion difference value is greater than 0;
and when the ventilation fusion difference value is larger than 0, replacing the regeneration impurity removing piece.
In this embodiment, regeneration edulcoration ware still includes supplementary regeneration piece, supplementary regeneration piece with regeneration edulcoration piece is the same, supplementary regeneration piece is as regeneration removes the spare part of miscellaneous piece, is used for regeneration removes and replaces after the length of service time of miscellaneous piece reaches the appointed time, in order to realize supplementary regeneration piece with regeneration removes the alternate use of miscellaneous piece, is convenient for prolong regeneration removes the life of miscellaneous piece, reduces promptly the condition of the sulphide shutoff mesh that holds back on the miscellaneous piece is removed in regeneration. The ventilation time of the second processing gas is used for representing the processing time of the second processing gas, although both the organic impurity removing part and the regeneration impurity removing part have the function of desulfurization, the part mainly used for desulfurizing the second processing gas is the regeneration impurity removing part, and the service life of the regeneration impurity removing part directly influences the service life of the regeneration impurity remover. And the ventilation time and the preset time are subjected to time-melting treatment, namely the treatment time of the second treatment gas passing through the regeneration impurity removing piece is compared with the standard treatment time, namely the difference degree between the desulfurization time of the second treatment gas and the standard desulfurization time is obtained. The ventilation fusion difference value is used as the difference between the desulfurization time of the second treatment gas and the standard desulfurization time, so that the treatment time of the second treatment gas in the regeneration impurity remover can be conveniently determined, and the ventilation fusion difference value is larger than 0, which indicates that the treatment time of the second treatment gas in the regeneration impurity remover exceeds the expected time, at the moment, the treatment is continued again, so that the regeneration impurity removing piece cannot be used, namely, the second treatment gas cannot pass through the regeneration impurity removing piece. Therefore, before the situation occurs, the regeneration impurity removing part is replaced by the auxiliary regeneration part, the auxiliary regeneration part is used for desulfurization treatment, the regeneration impurity removing part is cleaned and then used as a new auxiliary regeneration part, and the regeneration impurity removing part is recycled, so that the service life of the regeneration impurity remover is prolonged.
In another embodiment, the organic impurity removing member, the regenerated impurity removing member and the auxiliary regeneration member are made of the same material and have the same structure, specifically, the first dry layer is an activated alumina layer, and the first dry layer is a spherical structure with a diameter of 3 mm; the second drying layer is a silica gel layer and is of a spherical structure with the diameter of 3 mm; the third drying layer is an activated carbon layer and is used for forming solid carbon monosulfide with sulfur in the second processing gas, and the third drying layer is of a columnar structure with the diameter of 3 mm; the fourth dry layer is an active alumina layer and is a spherical structure with the diameter of 3 mm. The organic impurity removing member, the regenerative impurity removing member, and the auxiliary regeneration member are different in specific surface area of each corresponding stage, for example, specific surface area of the activated carbon layer in the regenerative impurity removing member and the auxiliary regeneration member is larger than specific surface area of the activated carbon layer in the organic impurity removing member.
In one embodiment, the present application further provides a gaseous carbon dioxide impurity removal apparatus comprising: the device comprises a compression device, a secondary impurity removal device and a tertiary impurity removal device; the first gas inlet of the compression device is used for leading in raw gas to be purified, the compression device is used for carrying out secondary compression treatment on the raw gas to be purified to obtain secondary purified gas, and the first gas outlet of the compression device is used for leading out the secondary compressed gas; an input port of the secondary impurity removal device is communicated with a first gas outlet of the compression device, an output port of the secondary impurity removal device is communicated with a second gas inlet of the compression device, and the secondary impurity removal device is used for performing three-stage compression treatment on secondary impurity removal gas output by the secondary impurity removal device to obtain three-stage compressed gas; and the input port of the third-stage impurity removal device is communicated with the second gas outlet of the compression device and is used for carrying out third-stage impurity removal treatment on the third-stage compressed gas to obtain carbon dioxide gas, and the output port of the third-stage impurity removal device is used for outputting the carbon dioxide gas. In this embodiment, treat the secondary compression of edulcoration feed gas through compressor arrangement, make the boiling point of treating various impurity in the edulcoration feed gas reduce, the secondary edulcoration device of being convenient for will treat main organic matter impurity and moisture in the edulcoration feed gas and clear away, in order to obtain the secondary edulcoration gas, later with the pressurization of secondary edulcoration gas through compressor arrangement once more, further improve the gas pressure, thereby further reduce the boiling point of each impurity in the secondary edulcoration gas, thereby be convenient for tertiary edulcoration device further clear away remaining organic matter impurity, the content percentage of carbon dioxide gas has been improved effectively, thereby carbon dioxide gas's purity has been improved effectively.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for removing impurities from gaseous carbon dioxide is characterized by comprising the following steps:
conveying a raw material gas to be purified to a compression device for secondary compression treatment to obtain a secondary compressed gas, wherein the raw material gas to be purified comprises carbon dioxide gas and various impurities to be treated;
conveying the secondary compressed gas to a secondary impurity removal device for secondary impurity removal treatment to obtain secondary impurity removal gas;
conveying the secondary impurity-removed gas to the compression device for tertiary compression treatment to obtain tertiary compressed gas;
and conveying the three-stage compressed gas to a three-stage impurity removal device for three-stage impurity removal treatment to obtain carbon dioxide gas.
2. A gaseous carbon dioxide impurity removal method according to claim 1, wherein the step of conveying the secondary compressed gas to a secondary impurity removal device for secondary impurity removal processing to obtain a secondary compressed gas comprises the following steps:
and conveying the secondary compressed gas to a coarse impurity remover for coarse impurity removal treatment to obtain a first treated gas.
3. The impurity removing method for the gaseous carbon dioxide as claimed in claim 2, wherein the impurity remover comprises a impurity removing housing, a dry adsorption layer and an organic adsorption layer, the dry adsorption layer and the organic adsorption layer are arranged in the impurity removing housing in a layered manner, the impurity removing housing is provided with a first air inlet and a first air outlet, the first air inlet is used for introducing the secondary compressed gas, and the first air outlet is used for leading out the first processing gas.
4. The method for removing impurities from gaseous carbon dioxide as recited in claim 2, wherein the step of delivering the secondary compressed gas to a coarse impurity remover for performing a coarse impurity removal treatment to obtain a first treated gas, and further comprising the steps of:
and conveying the first treatment gas to a de-hydrocarbon device for de-hydrocarbon treatment to obtain a second treatment gas.
5. The impurity removing method for gaseous carbon dioxide as claimed in claim 4, wherein the hydrocarbon removing device comprises a hydrocarbon removing shell, a preheating part, a heating part and a reaction part, the preheating part, the heating part and the reaction part are all located in the hydrocarbon removing shell, the preheating part, the heating part and the reaction part are connected in sequence, the hydrocarbon removing shell is provided with a second air inlet hole and a second air outlet hole, the second air inlet hole is used for guiding the first processing gas to the preheating part, and the second air outlet hole is used for guiding out the second processing gas output by the reaction part.
6. A gaseous carbon dioxide impurity removal method according to claim 4, wherein the first treated gas is conveyed to a hydrocarbon removal device for hydrocarbon removal treatment to obtain a second treated gas, and then the method further comprises:
and conveying the second processing gas to a regeneration impurity remover for regeneration impurity removal treatment to obtain a third processing gas.
7. A gaseous carbon dioxide impurity removal method according to claim 6, wherein the second treated gas is conveyed to a regeneration impurity remover for carrying out renewable impurity removal treatment to obtain a third treated gas, and then the method further comprises:
and conveying the third processing gas to a coarse filter for coarse filtration to obtain the secondary impurity-removed gas.
8. A gaseous carbon dioxide impurity removal method according to claim 1, wherein the step of conveying the three-stage compressed gas to a three-stage impurity removal device for three-stage impurity removal treatment to obtain carbon dioxide gas comprises the following steps:
and conveying the third-stage compressed gas to a fine impurity remover for fine impurity removal treatment to obtain fourth treated gas.
9. The method according to claim 8, wherein the three-stage compressed gas is delivered to a refined impurity remover to be refined and purified to obtain a fourth processed gas, and the method further comprises:
and conveying the fourth processing gas to a fine filter for fine filtration to obtain the carbon dioxide gas.
10. A gaseous carbon dioxide impurity removal device, comprising:
the device comprises a compression device, a first gas inlet of the compression device is used for leading in raw gas to be purified, the compression device is used for carrying out secondary compression treatment on the raw gas to be purified to obtain secondary impurity-removed gas, and a first gas outlet of the compression device is used for leading out the secondary compressed gas;
the input port of the secondary impurity removal device is communicated with the first air outlet of the compression device, the output port of the secondary impurity removal device is communicated with the second air inlet of the compression device, and the secondary impurity removal device is used for performing tertiary compression treatment on secondary impurity removal gas output by the secondary impurity removal device to obtain tertiary compressed gas;
and an input port of the tertiary impurity removal device is communicated with a second gas outlet of the compression device and is used for carrying out tertiary impurity removal treatment on the tertiary compressed gas to obtain carbon dioxide gas, and an output port of the tertiary impurity removal device is used for outputting the carbon dioxide gas.
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