CN217449549U - Device for concentrating and recovering carbon dioxide by low-pressure method - Google Patents
Device for concentrating and recovering carbon dioxide by low-pressure method Download PDFInfo
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- CN217449549U CN217449549U CN202220475003.0U CN202220475003U CN217449549U CN 217449549 U CN217449549 U CN 217449549U CN 202220475003 U CN202220475003 U CN 202220475003U CN 217449549 U CN217449549 U CN 217449549U
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Abstract
The utility model discloses a device for concentrating and recovering carbon dioxide by a low-pressure method. The device comprises a raw material gas buffer tank, gas-liquid separators I and II, a purification tower, a recovery tower, desorption gas buffer tanks I, II, III and IV, a purification gas buffer tank, vacuum pump units I and II, fan units I and II and a heat exchanger; the raw material gas inlet device is sequentially connected with a raw material gas buffer tank, a fan unit I, a gas-liquid separator I and a purification tower; purification tower and desorption gas buffer tank IThe purification tower is connected with a desorption gas buffer tank II through a vacuum pump unit I and then sequentially connected with a fan unit II, a gas-liquid separator II and a recovery tower; the recovery tower is respectively connected with a desorption gas buffer tank III and a desorption gas buffer tank IV through a vacuum pump unit II. The utility model has simple structure, safety, environmental protection and energy conservation, and can contain CO 2 Treating 5-40% of mixed gas at low pressure to obtain CO 2 The product with the content of 95-99.5% can be widely used for tail gas treatment in industries such as electric power, metallurgy, building materials and the like.
Description
Technical Field
The utility model belongs to the technical field of chemical gas treatment equipment, specifically be the concentrated device of retrieving carbon dioxide of low pressure method.
Background
In the industries of electric power, metallurgy, building materials, cement, chemical fertilizers and the like, a large amount of waste gas is discharged in the production process, such as flue gas, lime kiln gas and the like, the waste gas is usually normal pressure and mainly comprises carbon dioxide, nitrogen, a small amount of oxygen, water vapor, sulfides, nitrogen oxides and the like, the carbon dioxide in the waste gas is a main component for causing greenhouse effect, and the negative influence of the carbon dioxide on the earth ecosystem, economic development, human health and life quality is not ignored.
In the prior art, the method mainly reduces and counteracts the emission of carbon dioxide by means of afforestation, energy conservation, emission reduction and the like, and realizes zero emission of carbon dioxide. The carbon capture technology is a technology for collecting carbon dioxide in exhaust gas generated from large-scale factories, power plants, and the like, and storing and recycling the carbon dioxide in various ways to prevent the carbon dioxide from being directly discharged into the atmosphere, and is considered as the most economical and feasible method for reducing greenhouse gas emission and alleviating global warming on a large scale in the future. Besides positive influence on climate change, the carbon capture technology can also realize certain commercial value, and the captured and concentrated recovered carbon dioxide can be used for petroleum exploitation, smelters, fertilizer production, welding protection and the like according to different concentration and quality, and can be used for industries of food, medicine, electronics, special mixed gas and the like even after further deep processing. Therefore, the method has better environmental protection benefit and certain economic benefit for concentrating and recovering the carbon dioxide in the waste gas. The significance of concentrating and recovering carbon dioxide is very important.
The waste gas contains sulfur, phosphorus, nitrogen oxide and other impurities in a wide concentration range of carbon dioxide, and has no pressure, so that certain difficulty is caused in capturing and recovering the carbon dioxide. At present, the methods for recovering and treating carbon dioxide in flue gas and lime kiln gas mainly comprise a solvent absorption method, a pressure swing adsorption method and the like. The solvent absorption method is used for recovering carbon dioxide, such as a hot potash method, an activated hot potash method, a concentrated ammonia water absorption method, an alkylolamine method, a carbon-acrylic absorption method, a low-temperature methanol washing method and the like, and the methods have the defects of equipment corrosion, easy degradation of solution, high regeneration energy consumption, addition of various catalysts and corrosion inhibitors, complex process flow, low yield of effective components, substandard purification degree of exhaust gas and the like. The pressure swing adsorption method for recovering carbon dioxide in flue gas and lime kiln gas has the advantages that in the prior art, gas under normal pressure is pressurized to 0.5-2.0 MPa for operation, but because the content of carbon dioxide in the gas is low, and carbon dioxide products obtained by the pressure swing adsorption method basically have no pressure, the value of the obtained products is lower than the consumption in the production process, the traditional pressure swing adsorption method is not suitable for recovering the gas, the concentration of the recovered carbon dioxide products is not high, and the carbon dioxide products cannot be directly used in most occasions.
Therefore, it is urgently needed to design and develop a set of pressure swing adsorption device for concentrating and recovering carbon dioxide in flue gas at low pressure so as to make up for the defect of recovering such gas by the existing pressure swing adsorption method.
Disclosure of Invention
The invention aims to solve the technical problems and provide the device for concentrating and recovering the carbon dioxide by the low-pressure method, which has the advantages of simple structure, low operation cost and high automation degree.
In order to achieve the above purpose, the specific technical solution of the present invention is:
the device for concentrating and recovering carbon dioxide by a low-pressure method comprises a raw material gas buffer tank, a gas-liquid separator I, a gas-liquid separator II, a purification tower, a recovery tower, a desorption gas buffer tank I, a desorption gas buffer tank II, a desorption gas buffer tank III, a desorption gas buffer tank IV, a purification gas buffer tank, a vacuum pump unit I, a vacuum pump unit II, a fan unit I, a fan unit II and a heat exchanger. The device comprises a raw material gas source device, a raw material gas buffer tank, a fan unit I, a gas-liquid separator I, a purification tower, a pipeline, a gas-liquid separator I, a gas-liquid separator II and a purification tower II, wherein the raw material gas source device is connected with the raw material gas buffer tank; the purification tower is respectively connected with a purification gas buffer tank and a desorption gas buffer tank I, the purification tower is connected with a desorption gas buffer tank II through a vacuum pump unit I, and the desorption gas buffer tank II is sequentially connected with a gas-liquid separator II and a recovery tower in series through pipelines through a fan unit II; the recovery tower is connected with a vacuum pump unit II through a pipeline, is respectively connected with a desorption gas buffer tank III and a heat exchanger behind the vacuum pump unit II, and is sequentially connected with a desorption gas buffer tank IV and the recovery tower behind the heat exchanger.
As a preferred embodiment in the present application, the purification tower comprises a raw material gas inlet, a final charge inlet, a purified gas outlet, an air extraction outlet and a reverse air outlet; wherein, the raw material gas inlet, the reverse air outlet and the air extraction outlet of the purification tower are all arranged at the bottom end of the purification tower; the final charging inlet and the purified gas outlet are both arranged at the top end of the purification tower.
As a preferred embodiment in the present application, the recovery tower comprises a raw material gas inlet, a final charge inlet, a purified gas outlet, a flushing gas inlet, an air pumping outlet and a reverse air discharging outlet; wherein, the raw material gas inlet, the reverse-bleeding gas outlet and the air extraction outlet of the recovery tower are all arranged at the bottom end of the recovery tower; the final charging inlet, the purified gas outlet and the flushing gas inlet are all arranged at the top end of the recovery tower.
As a preferred embodiment in the present application, the raw material gas buffer tank is connected with the raw material gas inlet of the purification tower, and the final charge inlet is connected with the purified gas outlet of the purification tower through a pipeline; the air pumping outlet is connected with the vacuum pump unit I through a pipeline, and the reverse air outlet is connected with the desorption air buffer tank I through a pipeline.
As a better implementation mode in the application, the gas-liquid separator II is connected with a raw gas inlet of the recovery tower, the final charge inlet is connected with a purified gas outlet of the recovery tower through a pipeline, and the flushing gas inlet is connected with a desorption gas buffer tank IV; the air pumping outlet is connected with the vacuum pump unit II through a pipeline, and the reverse air outlet is connected with the desorption air buffer tank II through a pipeline.
As a better implementation mode in the application, the purification towers are respectively provided with a program control valve, and the program control valves are connected with a control device.
As a better implementation mode in the application, the recovery tower is provided with the program control valves which are connected with the control device.
In a preferred embodiment of the present invention, the number of the purification towers is 3 to 12, and the purification towers are connected in parallel. The purification tower is filled with a composite adsorbent filler consisting of alumina, activated carbon and silica gel, and the adsorbent realizes the adsorption of carbon dioxide gas.
In a preferred embodiment of the present invention, the number of the recovery towers is 3 to 12, and the recovery towers are connected in parallel. The recovery tower is filled with a composite adsorbent filler consisting of alumina, activated carbon and silica gel, and the adsorbent realizes the adsorption of carbon dioxide gas.
As a better implementation mode in the application, a regulating valve is arranged between the purified gas outlet and the final charging inlet of the purifying tower.
As a better implementation mode in the application, a regulating valve is arranged between the purified gas outlet and the final charging inlet of the recovery tower.
As a better implementation mode in the application, a regulating valve is arranged between the purified gas outlet of the purifying tower and the purified gas buffer tank.
As a better implementation mode in the application, a regulating valve is arranged between the purified gas outlet of the recovery tower and the raw material gas buffer tank.
As a better implementation mode in this application, fan unit I is provided with the bypass and is provided with the governing valve, and ability effectual control fan is imported and exported pressure steady.
As a better implementation mode in this application, fan unit II is provided with the bypass and is provided with the governing valve, and ability effectual control fan is imported and exported pressure steady.
As a better implementation mode in this application, desorption gas buffer tank I and desorption gas buffer tank II between be equipped with the governing valve.
As a better implementation mode in this application, desorption gas buffer tank I and desorption gas buffer tank II between be equipped with the governing valve.
As a better implementation mode in the application, a regulating valve is arranged between the reverse-release gas outlet of the recovery tower and the desorption gas buffer tank II.
In a preferred embodiment of the present application, the control valves of the present apparatus are all connected to a control device.
The working principle of the device is as follows:
the device is characterized in that mixed gas containing 5-40% of carbon dioxide enters the device under normal pressure, the raw gas is pressurized to 0.05-0.1 MPa through a fan unit I after entering a buffer tank in a raw gas buffer tank, free moisture is separated through a gas-liquid separator I, the raw gas automatically enters a regenerated purification tower through a preset program control system, and is separated through an adsorbent filled in the purification tower, carbon dioxide, water and the like are adsorbed by the adsorbent and stay in the tower, and nitrogen with the byproduct content of 90-99.9% is discharged from the top of the tower. After adsorption of one purification tower is finished, one part of residual gas in the tower is placed into the other recovery tower from the top of the tower, then the other part of residual gas is placed into desorption gas buffer tanks I and II from the bottom of the tower, and finally carbon dioxide, moisture and the like adsorbed and remained in the adsorbent are desorbed by adopting a vacuumizing and vacuumizing flushing mode to obtain semi-product gas with the carbon dioxide content of 35-85%, so that the adsorbent is regenerated. After the regeneration of one purifying tower is finished, partial purified gas is utilized to boost the pressure of the purifying tower to the adsorption pressure, and the next adsorption process is prepared. The whole process is circularly operated by at least 3 purifying towers, the time is evenly staggered, and the whole switching process is automatically controlled by a preset program system, so that the continuous, stable and safe operation of the device is ensured.
Meanwhile, semi-product gas containing 35-85% of carbon dioxide desorbed from the purification tower is buffered by a desorption gas buffer tank I and a desorption gas buffer tank II, then is pressurized to 0.05-0.1 MPa by a fan unit II, free moisture is separated by a gas-liquid separator II, then automatically enters a regenerated recovery tower through a preset program control system, is separated by an adsorbent filled in the recovery tower, carbon dioxide, water and the like are adsorbed by the adsorbent and stay in the tower, and the rest gas is discharged from the top of the tower and returns to a feed gas buffer tank. After adsorption of one recovery tower is finished, putting one part of residual gas in the tower into the other recovery tower from the top of the tower, and then desorbing the carbon dioxide, moisture and the like adsorbed and remained in the adsorbent from the bottom of the tower in a vacuumizing, vacuumizing and flushing mode to obtain a product with the carbon dioxide content of 95-99.5%, so that regeneration of the adsorbent is realized. After the regeneration of one recovery tower is finished, partial purified gas is utilized to boost the pressure of the recovery tower to the adsorption pressure, and the next adsorption process is prepared. The whole process is circularly operated by at least 3 recovery towers, the time is evenly staggered, and the whole switching process is automatically controlled by a preset program system, so that the continuous, stable and safe operation of the device is ensured.
The purified gas outlet of the purification tower is provided with a regulating valve to stabilize the pressure of the device. The reverse air discharge and air extraction of the purification tower can be sequentially conveyed to a desorption air buffer tank (I/II), and regulating valves are arranged on pipelines of the desorption air buffer tank I and the desorption air buffer tank II to regulate pressure. And the inlet and the outlet of the fan unit I are provided with regulating valves for regulating the pressure of the inlet and the outlet of the fan.
The purified gas outlet of the recovery tower is provided with a regulating valve to stabilize the pressure of the device. The air extracted by the recovery tower is sequentially conveyed to a desorption gas buffer tank (III/IV). And a replacement gas outlet of the recovery tower is provided with a regulating valve for regulating pressure and flow. And the inlet and the outlet of the fan unit II are provided with regulating valves for regulating the pressure of the inlet and the outlet of the fan.
Compare with current pressure swing adsorption equipment, the utility model discloses an actively the effect is embodied at:
and (I) the total investment of the device is lower. The device is operated under 0.05-0.1 MPa, the pressurizing equipment uses a fan or a supercharger, and the investment of the whole device can be saved by 10-30%.
And secondly, the running cost of the device is lower. The device adopts a fan or a supercharger to pressurize and operate under 0.05-0.1 MPa, the power consumption is only 20-50% of that of the prior pressure swing adsorption technical device, the cooling water consumption is only 15-25% of that of the prior pressure swing adsorption technical device, and the instrument air used by the program control valve and the regulating valve is equivalent. The total operating cost of the total set of devices is only 20-45% of that of the existing pressure swing adsorption technical device.
And thirdly, the device is simpler in daily maintenance and lower in maintenance cost. Because the blower fan or the supercharger selected by the device has the advantages of simpler structure, smaller volume, less wearing parts and higher reliability compared with the compressor selected by the prior art, the blower fan or the supercharger has lower failure rate, easier daily maintenance, fewer spare parts and maintenance cost far lower than that of the compressor, and can save a large amount of expenditure on maintenance cost.
And fourthly, the device is provided with an intelligent self-adjusting control system. The computer can automatically track the running condition of the device and adjust corresponding control parameters according to the conditions of temperature, pressure, flow, composition and the like of the feed gas and the change of the product quality requirement, so that the device always runs in the optimal state, and unattended operation can be realized under the condition that front and back working procedures are relatively stable.
The device is a device for concentrating and recovering under low pressure by a two-stage method, and can be used for recovering and concentrating carbon dioxide mixed gas with the content of 5-40%, such as lime kiln gas, flue gas and other gases with low carbon dioxide content to obtain 95-99.5% carbon dioxide product gas. The utility model discloses simple structure, degree of automation are high, the running cost is low, safe environmental protection and energy saving, but the wide application is administered in the tail gas that production industries such as electric power, metallurgy, building materials, cement discharged.
Drawings
FIG. 1 is a schematic view of the connection relationship of the apparatus for concentrating and recovering carbon dioxide by low pressure method of the present invention.
Wherein, 1 is a raw material gas buffer tank; 2-fan set I; 3-gas-liquid separator I; 4-a purification column; 5-purified gas buffer tank; 6-desorption gas buffer tank I; 7-desorption gas buffer tank II; 8-vacuum pump unit I; 9-fan set II; 10-gas-liquid separator II; 11-recovery column; 12-vacuum pump unit II; 13-desorption gas buffer tank III; 14-a heat exchanger; 15-desorption gas buffer tank IV; 16-raw material gas inlet of the purification tower; 17-purified gas outlet of the purification tower; 18-the final filling inlet of the purification tower; 19-purge column reverse-flow gas outlet; 20-air extraction outlet of the purification tower; 21-raw material gas inlet of recovery tower; 22-recovery column purge gas outlet; 23-final filling inlet of recovery tower; 24-air extraction outlet of recovery tower; 25-purge gas inlet of recovery column; 26-reverse vent outlet of recovery tower; 27-a programmable valve; 28-regulating valve.
Detailed Description
The device for concentrating and recovering carbon dioxide by a low-pressure method comprises a raw material gas buffer tank, a fan unit I, a gas-liquid separator I, a purification tower, a purified gas buffer tank, a desorption gas buffer tank I, a desorption gas buffer tank II, a vacuum pump set I, a fan unit II, a gas-liquid separator II, a recovery tower, a vacuum pump set II, a desorption gas buffer tank III, a heat exchanger and a desorption gas buffer tank IV, wherein a raw material gas inlet device of the device is connected with the raw material gas buffer tank, and the fan unit I and the gas-liquid separator I are sequentially connected in series behind the raw material gas buffer tank; the raw material gas inlet of the purification tower is connected with the purification tower; a purified gas outlet of the purification tower is connected with a purified gas buffer tank; the reverse gas outlet of the purification tower is connected with a desorption gas buffer tank I; an air pumping outlet of the purification tower is connected with a vacuum pump unit I; the desorption gas buffer tank II is respectively connected with the vacuum pump unit I and the desorption gas buffer tank I; the desorption gas buffer tank II is sequentially connected in series with a fan unit II and a gas-liquid separator II; the feed gas inlet of the recovery tower is connected with the recovery tower; a flushing gas inlet of the recovery tower is connected with a desorption gas buffer tank IV; the purified gas outlet of the recovery tower is connected with the raw material gas buffer tank; the reverse gas outlet of the recovery tower is connected with a desorption gas buffer tank II; and an air pumping outlet of the recovery tower is connected with a vacuum pump unit II.
Preferably, the fan unit I is provided with a regulating valve bypass; an adjusting valve is arranged between the purified gas outlet of the purification tower and the purified gas buffer tank; an adjusting valve is arranged between the purified gas outlet of the purifying tower and the final charging inlet of the purifying tower; an adjusting valve is arranged between the desorption gas buffer tank I and the desorption gas buffer tank II; the fan unit II is provided with a regulating valve bypass; an adjusting valve is arranged between the purified gas outlet of the recovery tower and the raw material gas buffer tank; an adjusting valve is arranged between the purified gas outlet of the recovery tower and the final charge inlet of the recovery tower; an adjusting valve is arranged between the replacement gas inlet of the recovery tower and the desorption gas buffer tank IV; and an adjusting valve is arranged between the reverse-discharge gas outlet of the recovery tower and the desorption gas buffer tank II.
Preferably, the purification tower is filled with an adsorbent filler, and the adsorbent can efficiently recover carbon dioxide; the recovery tower is filled with an adsorbent filler, and the adsorbent can efficiently concentrate carbon dioxide.
Preferably, all the regulating valves of the device are connected with the control device, so that automatic operation can be better realized.
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that, in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Additionally, the utility model discloses it is pointed out that, in the utility model, if do not write out structure, connection relation, positional relationship, power source relation etc. that concretely relates to very much, then the utility model relates to a structure, connection relation, positional relationship, power source relation etc. are technical personnel in the field on prior art's basis, can not learn through creative work.
Example 1:
as shown in fig. 1, the apparatus for concentrating and recovering carbon dioxide by low pressure method comprises a raw material gas buffer tank, a fan unit I, a gas-liquid separator I, a purification tower, a purified gas buffer tank, a desorption gas buffer tank I, a desorption gas buffer tank II, a vacuum pump set I, a fan unit II, a gas-liquid separator II, a recovery tower, a vacuum pump set II, a desorption gas buffer tank III, a desorption gas buffer tank IV and a heat exchanger, wherein raw material gas of the apparatus is connected with the raw material gas buffer tank and is sequentially connected with the fan unit I, the gas-liquid separator I and the purification tower behind the raw material gas buffer tank, the purification tower is connected with the desorption gas buffer tank I, and the purification tower is connected with the desorption gas buffer tank II through the vacuum pump unit I; and the recovery tower is connected with the desorption gas buffer tank II through a vacuum pump unit II in sequence, and is connected with the desorption gas buffer tank III, the heat exchanger and the desorption gas buffer tank IV.
The purification tower comprises a raw material gas inlet, a final charge inlet, a purified gas outlet, a reverse air discharge outlet and an air extraction outlet; wherein, the raw material gas inlet, the reverse air outlet and the air extraction outlet of the purification tower are all arranged at the bottom end of the purification tower; the final charging inlet and the purified gas outlet are both arranged at the top end of the purification tower; the recovery tower comprises a raw material gas inlet, a final charge inlet, a purified gas outlet, an air pumping outlet, a flushing gas inlet and a reverse air outlet; wherein, the raw material gas inlet, the air extraction outlet and the reverse air outlet of the recovery tower are all arranged at the bottom end of the recovery tower; the purified gas outlet, the final charge inlet and the flushing gas inlet are all arranged at the top end of the recovery tower.
The gas-liquid separator I is connected with a raw gas inlet of the purification tower, and the final charge inlet is connected with a purified gas outlet of the purification tower through a pipeline; the air pumping outlet is connected with the vacuum pump unit I through a pipeline, and the reverse air discharging outlet is connected with the desorption air buffer tank I through a pipeline; the gas-liquid separator II is connected with a raw gas inlet of the recovery tower, the final charge inlet is connected with a purified gas outlet of the recovery tower through a pipeline, and the flushing gas inlet is connected with a desorption gas buffer tank IV through a pipeline; the air pumping outlet is connected with the vacuum pump unit II through a pipeline, and the reverse air outlet is connected with the desorption air buffer tank II through a pipeline.
The fan unit I is provided with a regulating valve bypass; an adjusting valve is arranged between the purified gas outlet of the purification tower and the purified gas buffer tank; an adjusting valve is arranged between the purified gas outlet of the purifying tower and the final charging inlet of the purifying tower; an adjusting valve is arranged between the desorption gas buffer tank I and the desorption gas buffer tank II; the fan unit II is provided with a regulating valve bypass; an adjusting valve is arranged between the purified gas outlet of the recovery tower and the raw material gas buffer tank; an adjusting valve is arranged between the purified gas outlet of the recovery tower and the final charge inlet of the recovery tower; an adjusting valve is arranged between the replacement gas inlet of the recovery tower and the desorption gas buffer tank IV; and an adjusting valve is arranged between the reverse-discharge gas outlet of the recovery tower and the desorption gas buffer tank II.
The number of the purification towers is 7, and the purification towers are connected in parallel. The purification tower is provided with program control valves which are connected with a control device. The purification tower is filled with composite adsorbent filler of any one or more of active carbon, silica gel and alumina. The number of the recovery towers is 5, and the recovery towers are connected in parallel. And the recovery tower is provided with program control valves which are connected with a control device. The recovery tower is filled with composite adsorbent filler of any one or more of active carbon, silica gel and alumina.
The purification tower is filled with adsorbent filler, and the adsorbent can efficiently recover carbon dioxide; the recovery tower is filled with an adsorbent filler, and the adsorbent can efficiently concentrate carbon dioxide.
The specific operation process of the device is as follows:
the pressure of the pretreated boiler flue gas is 0.005MPa, the temperature is 42 ℃, and the gas amount is about 20000Nm 3 The composition,/h, is shown in the following table:
TABLE 1 boiler flue gas composition (V%)
When the device is operated, feed gas containing 14 percent of carbon dioxide enters the device at the temperature of 42 ℃ under the pressure of 0.005MPa, is firstly buffered in a feed gas buffer tank and then is pressurized to 0.005MPa through a fan unit I, free moisture is removed through a gas-liquid separator I connected in series, the feed gas enters a preset program control system and automatically enters a regenerated purification tower, the feed gas is separated through an adsorbent filled in the purification tower, carbon dioxide, water and the like are adsorbed by the adsorbent and stay in the tower, and nitrogen with the byproduct content of 99 percent is discharged from the top of the tower. After the adsorption of one purifying tower is finished, one part of residual gas in the tower is put into another recovery tower from the top of the tower, then the other part of residual gas is put into desorption gas buffer tanks I and II from the bottom of the tower, and finally, the carbon dioxide, moisture and the like adsorbed and remained in the adsorbent are desorbed by adopting the modes of evacuation and evacuation flushing to realize the regeneration of the adsorbent. After the regeneration of one purifying tower is finished, partial purified gas is utilized to boost the pressure of the purifying tower to the adsorption pressure, and the next adsorption process is prepared. The whole process is circularly operated by 7 purifying towers, the time is evenly staggered, the whole switching process is automatically controlled by a preset program system, and the continuous, stable and safe operation of the device is ensured. The circulation unit process of each tower is as follows: a (adsorption) -D (reverse-discharge) -V (evacuation) -FR (Final liter).
Meanwhile, the gas containing 40-50% of carbon dioxide desorbed from the purification tower is buffered by a desorption gas buffer tank I and a desorption gas buffer tank II, then is pressurized to 0.05MPa by a fan unit II, is separated from free moisture by a gas-liquid separator II, automatically enters a regenerated recovery tower by a preset program control system, is separated by an adsorbent filled in the recovery tower, carbon dioxide, water and the like are adsorbed by the adsorbent and stay in the tower, and the rest gas is discharged from the top of the tower and returns to a feed gas buffer tank. After the adsorption of one recovery tower is finished, putting one part of residual gas in the tower into the other recovery tower from the top of the tower, and then desorbing the carbon dioxide, moisture and the like adsorbed and remained in the adsorbent from the bottom of the tower in a vacuumizing and vacuumizing flushing mode to obtain a product with the carbon dioxide content of more than or equal to 98.5%, so as to realize the regeneration of the adsorbent. After the regeneration of one recovery tower is finished, the pressure of the recovery tower is raised to the adsorption pressure by utilizing partial purified gas, and the recovery tower is prepared to enter the next adsorption process. The whole process is circularly operated by 5 recovery towers, the time is evenly staggered, the whole switching process is automatically controlled by a preset program system, and the continuous, stable and safe operation of the device is ensured. The circulation unit process of each tower is as follows: a (adsorption) -D (reverse discharge) -V/VP (evacuation and evacuation rinse) -FR (Final liter).
The process in the utility model discloses in the device handle the back, byproduct nitrogen gas purity is more than or equal to 99%, and product carbon dioxide purity is more than or equal to 98.5%, and the in-process does not have other discharge gas to produce, does not cause the pollution to the environment to furthest's recovery wherein active ingredient.
The foregoing basic embodiments and various further alternative embodiments of the present invention can be freely combined to form multiple embodiments, all of which are embodiments of the present invention that can be adapted and claimed. In the scheme of the utility model, each selection example can be combined with any other basic examples and selection examples at will. Numerous combinations will be known to those skilled in the art.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The device of concentrated recovery carbon dioxide of low pressure method, the device include raw materials gas buffer tank (1), fan unit I (2), vapour and liquid separator I (3), purifying column (4), purification gas buffer tank (5), desorption gas buffer tank I (6), desorption gas buffer tank II (7), vacuum pump unit I (8), fan unit II (9), vapour and liquid separator II (10), recovery tower (11), vacuum pump unit II (12), desorption gas buffer tank III (13), heat exchanger (14) and desorption gas buffer tank IV (15), its characterized in that: the raw material gas source device is connected with a raw material gas buffer tank (1), and the raw material gas buffer tank (1) is sequentially connected with a gas-liquid separator I (3) and a purification tower (4) in series through pipelines by a fan unit I (2); the purification tower (4) is respectively connected with a purification gas buffer tank (5) and a desorption gas buffer tank I (6), the purification tower (4) is connected with a desorption gas buffer tank II (7) through a vacuum pump unit I (8), and the desorption gas buffer tank II (7) is sequentially connected with a gas-liquid separator II (10) and a recovery tower (11) in series through pipelines through a fan unit II (9); the recovery tower (11) is connected with a vacuum pump unit II (12) through a pipeline, the vacuum pump unit II (12) is respectively connected with a desorption gas buffer tank III (13) and a heat exchanger (14), and a desorption gas buffer tank IV (15) and the recovery tower (11) are sequentially connected in series behind the heat exchanger (14).
2. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 1, wherein: the purification tower (4) comprises a purification tower raw material gas inlet (16), a purification tower final charge inlet (18), a purification tower purified gas outlet (17), a purification tower reverse air outlet (19) and a purification tower air extraction outlet (20); wherein, a raw material gas inlet (16) of the purification tower, a reverse air outlet (19) of the purification tower and an air outlet (20) of the purification tower are all arranged at the bottom end of the purification tower (4); the purification tower final filling inlet (18) and the purification tower purified gas outlet (17) are both arranged at the top end of the purification tower (4).
3. The apparatus for concentrating and recovering carbon dioxide by the low pressure method according to claim 1, wherein: the recovery tower (11) comprises a recovery tower raw material gas inlet (21), a recovery tower final charge inlet (23), a recovery tower purified gas outlet (22), a recovery tower air extraction outlet (24), a flushing gas inlet (25) and a recovery tower reverse-release gas outlet (26); wherein, a raw material gas inlet (21) of the recovery tower, an air extraction outlet (24) of the recovery tower and a reverse vent gas outlet (26) of the recovery tower are all arranged at the bottom end of the recovery tower (11); a purified gas outlet (22) of the recovery tower, a final filling inlet (23) of the recovery tower and a flushing gas inlet (25) are all arranged at the top end of the recovery tower (11).
4. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 2, wherein: the gas-liquid separator I (3) is connected with a raw gas inlet (16) of the purification tower, and a final filling inlet (18) of the purification tower is connected with a purified gas outlet (17) of the purification tower through a pipeline; an air pumping outlet (20) of the purification tower is connected with a vacuum pump unit I (8) through a pipeline, and a reverse air outlet (19) of the purification tower is connected with a desorption gas buffer tank I (6) through a pipeline.
5. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 3, wherein: the gas-liquid separator II (10) is connected with a raw gas inlet (21) of a recovery tower, a final filling inlet (23) of the recovery tower is connected with a purified gas outlet (22) of the recovery tower through a pipeline, and a flushing gas inlet (25) is connected with a desorption gas buffer tank IV (15) through a pipeline; an air pumping outlet (24) of the recovery tower is connected with a vacuum pump unit II (12) through a pipeline, and a reverse air outlet (26) of the recovery tower is connected with a desorption gas buffer tank II (7) through a pipeline.
6. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 1, wherein: program control valves are arranged on the purification towers (4) and are connected with a control device; the recovery tower (11) is provided with program control valves which are connected with a control device.
7. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 1, wherein: the purification towers (4) are 3-12, and all the purification towers are connected in parallel; the number of the recovery towers (11) is 3-12, and all the recovery towers are connected in parallel.
8. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 2, wherein: an adjusting valve is arranged between the desorption gas buffer tank I (6) and the desorption gas buffer tank II (7); and an adjusting valve is arranged between the purified gas outlet (17) of the purification tower and the final filling inlet (18) of the purification tower.
9. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 3, wherein: an adjusting valve is arranged between the purified gas outlet (22) of the recovery tower and the final charging inlet (23) of the recovery tower, and an adjusting valve is arranged between the reverse gas outlet (26) of the recovery tower and the desorption gas buffer tank II (7); and an adjusting valve is arranged between a flushing gas inlet (25) of the recovery tower and the desorption gas buffer tank IV (15).
10. The apparatus for concentrating and recovering carbon dioxide by low pressure method according to claim 1, wherein: a bypass is arranged on the fan unit I (2), and a regulating valve is arranged on the bypass; and a bypass is arranged on the fan unit II (9), and a regulating valve is arranged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220475003.0U CN217449549U (en) | 2022-03-03 | 2022-03-03 | Device for concentrating and recovering carbon dioxide by low-pressure method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220475003.0U CN217449549U (en) | 2022-03-03 | 2022-03-03 | Device for concentrating and recovering carbon dioxide by low-pressure method |
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| CN202220475003.0U Active CN217449549U (en) | 2022-03-03 | 2022-03-03 | Device for concentrating and recovering carbon dioxide by low-pressure method |
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| CN (1) | CN217449549U (en) |
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