CN113856411A - Spherical solid amine multistage thin-layer bubbling bed carbon dioxide capture and desorption system and method - Google Patents
Spherical solid amine multistage thin-layer bubbling bed carbon dioxide capture and desorption system and method Download PDFInfo
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- 238000003795 desorption Methods 0.000 title claims abstract description 71
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 70
- 150000001412 amines Chemical class 0.000 title claims abstract description 68
- 239000007787 solid Substances 0.000 title claims abstract description 68
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003546 flue gas Substances 0.000 claims abstract description 64
- 239000003463 adsorbent Substances 0.000 claims abstract description 63
- 238000001179 sorption measurement Methods 0.000 claims abstract description 59
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims description 32
- 238000004064 recycling Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 239000002594 sorbent Substances 0.000 claims 1
- 239000000498 cooling water Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 239000011159 matrix material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002156 adsorbate Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000002808 molecular sieve Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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- 238000010079 rubber tapping Methods 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- 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
- B01D53/06—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 moving adsorbents, e.g. rotating beds
- B01D53/10—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 moving adsorbents, e.g. rotating beds with dispersed adsorbents
- B01D53/12—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 moving adsorbents, e.g. rotating beds with dispersed adsorbents according to the "fluidised technique"
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/20—Organic adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
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- B01D2257/504—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
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- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- B01D2259/406—Further details for adsorption processes and devices using more than four beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2259/406—Further details for adsorption processes and devices using more than four beds
- B01D2259/4061—Further details for adsorption processes and devices using more than four beds using five beds
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Abstract
The application provides a system and a method for capturing and desorbing spherical solid amine multistage thin-layer bubbling bed carbon dioxide, wherein at least two groups of thin-layer bubbling bed components are stacked from top to bottom in an adsorption device, the main body of each group of thin-layer bubbling bed components is an air distribution hole plate, one end of the air distribution hole plate is a feeding end, the other end of the air distribution hole plate is a discharging end, a discharging pipe is arranged at the discharging end of the air distribution hole plate, and the lower end of the discharging pipe is open and is communicated with the feeding end of the next group of air distribution hole plate; the top of the adsorption device is provided with a gas outlet, and the lower part of the adsorption device is provided with a flue gas inlet and an adsorbent discharge pipe; the top of the desorption device is sequentially provided with a filter and a desorption gas outlet, the lower part of the desorption device is provided with a heating coil and a distributor, and the bottom of the desorption device is provided with a material outlet; a cooling pipe and a distribution pipe are arranged in the cooling device, and the top of the cooling device is connected with a lifting pipe; the upper end of the lifting pipe extends into the adsorption device. The system is used for industrial flue gas CO2Capture of CO2High capture rate and capability of producing high-purity CO2And (5) producing the product.
Description
Technical Field
The application belongs to the technical field of environmental protection, industrial flue gas treatment and resource utilization, and particularly relates to a spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system and method.
Background
Industrial flue gas treatment is one of the important problems for environmental protection. Industrial flue gas is a main emission source of carbon dioxide, and research and development of technologies for capturing carbon dioxide in flue gas and utilizing resources thereof are increasingly accepted in the field of environmental protectionAttention and attention are paid. In several gas separation methods, CO in flue gas is captured by adsorption separation technology2More applications exist; the main process comprises the following steps: adsorbate CO2The low temperature/high pressure in the adsorption reactor is adsorbed by the adsorbent, and the high temperature/low pressure is desorbed, thereby realizing CO2Separating and enriching.
The adsorbent is a key factor for capturing carbon dioxide by an adsorption separation method, and commonly used carbon dioxide adsorbents comprise carbon-based materials, zeolite molecular sieves, solid amine adsorbents and the like. Furthermore, the adsorption process is industrially classified into pressure swing adsorption, temperature swing adsorption, power transformation adsorption and the like according to different desorption modes. The process of carbon dioxide adsorption and desorption is very complicated; how to efficiently capture CO from flue gas2And obtaining CO of high purity2Products, are still challenging research topics at present.
Disclosure of Invention
Based on the technical scheme, the application provides a spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system and method, and the device system is used for industrial flue gas CO2Trapping can achieve higher CO2Capture rate, and thus produce high purity CO2And (5) producing the product.
The application provides a spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system, which comprises an adsorption device, a desorption device and a cooling device, wherein at least two groups of thin-layer bubbling bed components are stacked from top to bottom in the adsorption device, the main body of each group of thin-layer bubbling bed components is an air distribution hole plate, one end of the air distribution hole plate is a feeding end, the other end of the air distribution hole plate is a discharging end, a discharging pipe is arranged at the discharging end of the air distribution hole plate, and the lower end of the discharging pipe is open and communicated with the feeding end of the next group of air distribution hole plate; the top of the adsorption device is provided with a gas outlet, the lower part of the adsorption device is provided with a flue gas inlet and an adsorbent discharge pipe, and the flue gas inlet and the adsorbent discharge pipe are connected with the middle part of the desorption device through a first conveying pipe;
the top of the desorption device is sequentially provided with a filter and a desorption gas outlet, the lower part of the desorption device is provided with a heating coil and a distributor, and the bottom of the desorption device is provided with a material outlet and is connected with the lower part of the cooling device through a second conveying pipe; a cooling pipe and a distribution pipe are arranged in the cooling device, and the top of the cooling device is connected with a lifting pipe; the upper end of the lifting pipe extends into the adsorption device.
In embodiments of the present application, each set of thin-layer bubbling bed assemblies further comprises a weir at the discharge end of the gas distribution plate, the discharge end fluidized material passing over the weir into the feed tube.
In the embodiment of the application, the height of the overflow weir is between 30 and 100 mm.
In the embodiment of the application, the blanking pipe is positioned outside and/or inside the shell of the adsorption device; and a flue gas filter is also arranged in front of the gas outlet at the top of the adsorption device.
In the embodiment of the application, the bubbling bed thickness of each group of thin-layer bubbling bed components is 50-100 mm.
In the embodiment of the application, 2-6 groups of thin-layer bubbling bed assemblies are stacked from top to bottom in the adsorption device.
The application provides a method for capturing and desorbing spherical solid amine by using a multistage thin-layer bubbling bed carbon dioxide, which comprises the following steps:
the spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system is adopted; the flue gas is introduced from a flue gas inlet at the lower part of the adsorption device, fluidizes spherical solid amine adsorbent particles and is adsorbed to trap CO in the flue gas2；
Adsorption of CO2The adsorbent material enters a desorption device through an adsorbent discharge pipe and a first conveying pipe, and fluidized steam or CO2Introducing gas from the distributor, heating the adsorbent material by the heating coil for desorption to obtain CO2Producing a product;
the desorbed solid amine particles enter the cooling device from a material outlet at the bottom of the desorption device through a second conveying pipe, and the fluidized air is introduced from the distribution pipe to cool the solid amine particles and is conveyed to the inside of the adsorption device through the riser for recycling.
In the embodiment of the application, the spherical solid amine adsorbent traps 30-100 g of CO2In kilograms.
In the embodiment of the application, the adsorption and trapping are carried out at 40-80 ℃ under the condition of 100-120 kPa, and the contact time is 1-10 seconds.
In the embodiment of the application, the adsorbent is heated to 80-110 ℃, and the desorption operation is carried out for 3-10 minutes.
The carbon dioxide trapping and desorbing system comprises an adsorption device, a desorption device and a cooling device, and CO is collected and desorbed2The trapping and desorption are continuously operated, and the method can be applied to industrial flue gas CO2And (4) trapping. Wherein, the adsorption process adopts spherical solid amine adsorbent, multistage directional flow thin-layer bubbling bed, takes 5-level thin-layer bubbling bed components as an example, specifically:
spherical solid amine adsorbent enters a 1-level thin-layer bubbling bed from the upper part of an adsorption device, solid amine particles of the adsorbent are fluidized by flue gas, fully contact and move towards a discharge end, enter a 1-level blanking pipe through a 1-level overflow weir, enter a feed end of a 2-level thin-layer bubbling bed by virtue of gravity flow, sequentially flow through the 2-level thin-layer bubbling bed, a 3-level thin-layer bubbling bed and a 4-level thin-layer bubbling bed, then enter a 4-level blanking pipe, flow into a 5-level thin-layer bubbling bed by virtue of gravity, are fluidized by the flue gas and move towards the discharge end, enter an adsorbent discharge pipe through a 5-level overflow weir, and enter a desorption device through a first spiral conveying pipe; flue gas enters from a flue gas inlet and sequentially passes through each thin-layer bubbling bed to flow upwards, and the flue gas in each thin-layer bubbling bed fluidizes spherical solid amine adsorbent particles, fully contacts with the spherical solid amine adsorbent particles under certain conditions, and adsorbs and traps CO in the flue gas2And the decarbonized flue gas is discharged after being filtered.
In the desorption apparatus, fluidizing steam or CO2Gas enters through the distributor, steam enters the heating coil, the solid amine adsorbent material is heated for desorption, and CO is obtained2Can produce 95 to 99 percent of CO by desorbing the CO from solid amine particles2Producing a product; the desorbed solid amine particles enter a cooling device through a second spiral conveying pipe; the fluidized air enters from the distribution pipe, the cooling water enters from the cooling pipe, the solid amine adsorbent particles can be cooled to 40 ℃, and the solid amine adsorbent particles are conveyed to a top thin-layer bubbling bed of the adsorption device through the riser for recycling.
In the present invention, the thin-layer bubbling bed pressure is reduced(the pressure drop of each thin-layer bubbling bed is 0.5-1 kPa), so that more stages of bubbling beds can be designed to realize countercurrent contact of flue gas and adsorbent, and CO is generated2The trapping rate can reach 90-96%. In addition, the invention needs low flue gas pressure, low device energy consumption and CO2Low trapping cost and can produce CO with the purity of 95 to 99 percent2And (5) producing the product. In addition, the invention has no waste residue and waste liquid discharge.
Drawings
Fig. 1 is a schematic structural diagram of a spherical solid amine multistage thin-layer bubbling bed carbon dioxide capture and desorption system provided in an embodiment of the present application;
the system comprises a gas outlet 1, a flue gas filter 2, an absorber 3, a quick split 4, a gas distribution hole plate 5-1, an overflow weir 6-1, a blanking pipe 7-1, a blanking pipe 8-4, a gas distribution hole plate 9-5, an overflow weir 10-5, an adsorbent discharge pipe 11, a flue gas inlet 12, a first spiral conveying pipe 13, a steam inlet 14, a heating coil 15, a condensed water outlet 16, a distributor 17, a riser 18, a second spiral conveying pipe 19, a distributor 20, a riser 21, a desorption gas outlet 22, a desorption gas filter 23, a desorption device 24, a cooler 25 and a serpentine cooling pipe 26; a-1 level thin layer bubbling bed, B-2 level thin layer bubbling bed, C-3 level thin layer bubbling bed, D-4 level thin layer bubbling bed and E-5 level thin layer bubbling bed.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system which comprises an adsorption device, a desorption device and a cooling device;
at least two groups of thin-layer bubbling bed assemblies are stacked from top to bottom in the adsorption device, the main body of each group of thin-layer bubbling bed assembly is an air distribution hole plate, one end of the air distribution hole plate is a feeding end, the other end of the air distribution hole plate is a discharging end, a discharging pipe is arranged at the discharging end of the air distribution hole plate, and the lower end of the discharging pipe is open and is communicated with the feeding end of the next group of air distribution hole plate; the top of the adsorption device is provided with a gas outlet, the lower part of the adsorption device is provided with a flue gas inlet and an adsorbent discharge pipe, and the flue gas inlet and the adsorbent discharge pipe are connected with the middle part of the desorption device through a first conveying pipe; the top of the desorption device is sequentially provided with a filter and a desorption gas outlet, the lower part of the desorption device is provided with a heating coil and a distributor, and the bottom of the desorption device is provided with a material outlet and is connected with the lower part of the cooling device through a second conveying pipe; a cooling pipe and a distribution pipe are arranged in the cooling device, and the top of the cooling device is connected with a lifting pipe; the upper end of the lifting pipe extends into the adsorption device.
The device system is used for industrial flue gas CO2Trapping can achieve higher CO2Capture rate, and thus produce high purity CO2And (5) producing the product.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a carbon dioxide capture and desorption system provided in an embodiment of the present application. Wherein, 1 is the gas outlet, 2 is the flue gas filter, 3 is the adsorber, 4 is the fast branch head, 5 is 1 level gas distribution hole board, 6 is 1 level overflow weir, 7 is 1 level unloading pipe, 8 is 4 level unloading pipe, 9 is 5 level gas distribution hole board, 10 is 5 level overflow weir, 11 is adsorbent relief pipe, 12 is the flue gas inlet, 13 is first spiral delivery pipe, 14 is the steam inlet, 15 is heating coil, 16 is the condensate outlet, 17 is the distributor, 18 is the riser, 19 is second spiral delivery pipe, 20 is the distributor pipe, 21 is the riser, 22 is the desorption gas outlet, 23 is the desorption gas filter, 24 is the desorber, 25 is the cooler, 26 is snakelike cooling tube.
The carbon dioxide entrapment and desorption system that this application embodiment provided includes: for capturing CO2The top of the adsorption device is provided with a gas outlet 1, and a flue gas filter 2 is preferably arranged in front of the gas outlet; the lower part of the adsorption device is provided with an adsorbent discharge pipe 11 and a flue gas inlet 12, such as an adsorber 3 shown in figure 1.
Inside the 3 casings of adsorber, from the top down the stack be equipped with 2 ~ 6 thin layer bubbling bed subassemblies more or more. In the embodiment of the invention, each group of thin-layer bubbling bed components consists of an air distribution hole plate, an overflow weir and a blanking pipe, wherein the air distribution hole plate is the main structure of the thin-layer bubbling bed components and adopts a narrow slit or sieve hole or tongue hole type air distribution hole plate, the opening rate is 5-15%, and an air cap is not generally arranged; the overflow weir, which has the function of maintaining a uniform overflow of the fluidized layer on the plate, is a flat weir or a tooth-type weir.
One end of the single-stage air distribution hole plate in the embodiment of the application is a feeding end, the other end of the single-stage air distribution hole plate is a discharging end, an overflow weir and a blanking pipe are arranged at the discharging end, and the lower end of the blanking pipe is open and is communicated with the feeding end of the next group (stage) of air distribution hole plate; and the fluidized material at the discharge end of the single-stage air distribution hole plate enters the discharge pipe after passing through the overflow weir. In the embodiment of the application, the blanking pipes of each stage may be located outside the shell of the adsorption device, or may be located inside the shell of the adsorption device, and preferably are all disposed outside the shell of the adsorption device.
In the embodiment of the application, the bubbling bed thickness of each group of thin-layer bubbling bed components is 50-100 mm, preferably 55-80 mm; the distance (height) between the 2 layers of bubbling beds is 0.5-1 m. Preferably, the height of each group of overflow weirs is between 30 and 100mm, and the overflow weirs can be arranged in the same size.
The adsorption device is internally provided with a multi-stage thin-layer bubbling bed (provided with a multi-stage air distribution hole plate and a discharge pipe), and the single-stage bubbling bed is low in thickness and multiple in stages (such as 4 stages, 5 stages, 6 stages and the like); the method adopts the spherical solid amine adsorbent, and the adsorbent particles flow radially in the thin-layer bubbling bed and then flow downwards along the blanking pipe2The capture rate is higher.
In some embodiments of the present application, spherical solid amine adsorbent enters the 1-stage thin-layer bubbling bed (a, with 1-stage gas distribution hole plate 5) from the top of the adsorber 3, and the adsorbent solid amine particles are fluidized by the flue gas, fully contact and move to the discharge end, pass through the 1-stage overflow weir 6, enter the 1-stage blanking pipe 7, enter the feed end of the 2-stage thin-layer bubbling bed (B) by gravity flow, sequentially pass through the 2-stage thin-layer bubbling bed (B), the 3-stage thin-layer bubbling bed (C), and the 4-stage thin-layer bubbling bed (D), then enter the 4-stage blanking pipe 8, enter the 5-stage thin-layer bubbling bed (E, 5-stage gas distribution hole plate 9) by gravity flow, are fluidized by the flue gas and move to the discharge end, pass through the 5-stage overflow weir 10, enter the adsorbent discharge pipe 11, entering a desorption device through a delivery pipe; flue gas enters from a flue gas inlet 12 and flows upwards to sequentially pass through each stage of thin-layer bubbling bed, and the flue gas in each stage of thin-layer bubbling bed is fluidized by spherical solid amine adsorbent particles and fully contacts with the spherical solid amine adsorbent particles under certain conditions to adsorb and capture CO in the flue gas2The decarbonized flue gas is filtered by a flue gas filter 2 and then discharged from a gas outlet 1.
The arrangement of each level of blanking pipes and adsorbent discharge pipes is not particularly limited; adsorption of CO2Is discharged from the discharge conduit, preferably through a first screw conveyor 13 into the desorption unit.
As shown in fig. 1, the carbon dioxide capture and desorption system according to the embodiment of the present application includes a desorber 24, a cooler 25, and a riser 21; the desorption device is provided with a steam inlet 14, the lower part of the desorption device is provided with a heating coil 15, a condensed water outlet 16 and a distributor 17, the top of the desorption device is provided with a desorption gas outlet 22 and a flue gas filter 23, the bottom of the desorption device is provided with a material outlet, and the desorption device is connected with the lower part of the cooling device through a second conveying pipe 19. The cooling device is internally provided with a distribution pipe 20 and a cooling pipe 26, the top of the cooling device is connected with a lifting pipe 21, and the upper end of the lifting pipe extends into the adsorption device.
The desorption device disclosed by the invention preferably adopts a vertical structure, is internally provided with the serpentine heating coil, adopts steam for condensation and heating, and has a good desorption effect. In the desorption apparatus according to the embodiment of the invention, the fluidizing steam or CO2Gas enters through a distributor (17), steam with the pressure of 0.3MPa (g) enters a serpentine heating coil (15), the solid amine adsorbent material is heated to 80-110 ℃, desorption operation is carried out for 3-10 minutes, and CO2Is desorbed from the solid amine particles and is led out from a desorption gas outlet (22) through a desorption gas filter (23).
Preferably, solid amine particles at the temperature of 80-110 ℃ enter a cooler (25) through a vertical pipe (18) and a second spiral conveying pipe (19); fluidizing air enters from a distribution pipe (20), cooling water enters from a serpentine cooling pipe (26), solid amine adsorbent particles are cooled to 40 ℃, and are conveyed to a thin-layer bubbling bed at the top layer of the adsorber (3) for recycling through a riser (21), and the upper end of the riser extends into the adsorber (3) and is connected with a fast tapping (4).
Wherein, the cooling device can also be matched with a vertical structure; preferably, serpentine cooling water tubes are used. The device system provided by the embodiment of the invention comprises the special cooler, and can be designed to be large enough according to needs, so that the cooling effect is fully ensured.
Accordingly, the present application provides a method for capturing and desorbing carbon dioxide in a spherical solid amine multistage thin-layer bubbling bed, comprising the following steps:
the spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system is adopted; the flue gas is introduced from a flue gas inlet at the lower part of the adsorption device, fluidizes spherical solid amine adsorbent particles and is adsorbed to trap CO in the flue gas2；
Adsorption of CO2The adsorbent material enters a desorption device through an adsorbent discharge pipe and a first conveying pipe, and fluidized steam or CO2Introducing gas from the distributor, introducing 0.3MPa (g) steam from the steam inlet of the heating coil to heat the adsorbent material for desorption to obtain CO2Producing a product;
the desorbed solid amine particles enter the cooling device from a material outlet at the bottom of the desorption device through a second conveying pipe, fluidized air (pressurized air) is introduced from the distribution pipe, and cooling water enters the serpentine cooling pipe to cool the solid amine particles, and the solid amine particles are conveyed to the inside of the adsorption device through the lifting pipe for recycling.
The spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing system is adopted, spherical solid amine is taken as an adsorbent, and the system can be applied to industrial flue gas CO2And (4) trapping. The industrial flue gas CO2The content is 5-15% (v), and the pressure is 100-120 kPa. In the embodiment of the application, the thickness of the thin-layer bubbling bed is 50-100 mm; trapping 30-100 g CO per kilogram of spherical solid amine adsorbent2. The examples of the present application use a spherical solid amine adsorbent in a resin matrix, more preferably a spherical solid amine adsorbent (DRC adsorbent) in a polystyrene matrix.
In the examples of the present application, CO is adsorbed and trapped in the adsorption device2The process is carried out at 40-80 ℃ and 100-120 kPa for 1-10 seconds, and the decarburization is carried outAnd (4) filtering the flue gas and then discharging.
Adsorption of CO2The adsorbent material is fed into a desorption device to fluidize steam or CO2Introducing gas from a distributor, introducing 0.3MPa (g) steam into a serpentine heating coil to heat the adsorbent to 80-110 ℃, desorbing for 3-10 minutes, and introducing CO2Can produce 95 to 99 percent of CO by desorbing the CO from solid amine particles2And (5) producing the product.
The desorbed solid amine particles enter a cooling device, fluidizing air (pressurized air) is introduced from a distribution pipe (the solid amine particles are in a fluidized state, have fluidity and enhance the heat transfer between the solid amine particles and a cooling pipe), cooling water is introduced into a serpentine cooling pipe to cool the solid amine adsorbent particles to 40 ℃, and the solid amine adsorbent particles are conveyed into the adsorption device through a riser for recycling.
For further understanding of the present application, the spherical solid amine multi-stage thin layer bubbling bed carbon dioxide capture and desorption system and method provided herein are specifically described below with reference to examples. The starting materials used in the following examples of the present application are all commercially available products.
Example 1
Referring to fig. 1, the spherical solid amine multistage thin-layer bubbling bed carbon dioxide trapping and desorbing device comprises an adsorber (3), a desorber (24), a cooler (25) and a riser (21), wherein 5 groups of thin-layer bubbling bed components are arranged in the adsorber (3) and consist of an air distribution hole plate, an overflow weir and a blanking pipe; the top of the absorber (3) is provided with a flue gas filter (2) and a gas outlet (1), the lower part is provided with a flue gas inlet (12) and an adsorbent discharge pipe (11), and the absorber is connected with a desorber (24) through a first spiral conveying pipe (13); the top of the desorber (24) is provided with a desorbed gas filter (23) and a desorbed gas outlet (22), the lower part of the desorber is provided with a heating coil (15) and a distributor (17), and the bottom of the desorber is connected with the lower part of the cooler (25) through a vertical pipe (18) and a second spiral conveying pipe (19); a snakelike cooling pipe (26) and a distribution pipe (20) are arranged in the cooler (25), and the top of the cooler is connected with the lower end of the lifting pipe (21); the upper end of the lifting pipe (21) extends into the adsorber (3) and is connected with the quick-separating head (4).
In each group of thin-layer bubbling bed components, the aperture ratio of the air distribution hole plate is 10-15%; the height of the overflow weir is 50 mm; the blanking pipe is arranged outside the adsorber shell.
The thickness of the thin-layer bubbling bed is 60 mm; adopting DRC adsorbent, and trapping 70-80 g of CO per kilogram of spherical solid amine adsorbent2。
For CO2Industrial flue gas with the content of 5-10% (v) and the pressure of 115kPa, wherein the flue gas enters from a flue gas inlet (12), sequentially passes through all levels of thin-layer bubbling beds to flow upwards, and the flue gas in all levels of thin-layer bubbling beds is fluidized by spherical solid amine adsorbent particles, fully contacts for 1-3 seconds under the conditions of 40-80 ℃ and 110-115 kPa (a), and adsorbs and traps CO in the flue gas2And the decarbonized flue gas is discharged after being filtered. Heating solid amine adsorbent material to 110 deg.C, desorbing for 6 min, and removing CO2Desorption from solid amine particles to produce 95% CO2And (5) producing the product.
From the above examples, it can be seen that the CO of the present system and method2The trapping rate can reach 90-96%. In addition, the invention needs low flue gas pressure, low device energy consumption and CO2Low trapping cost and can produce CO with the purity of 95 to 99 percent2And (5) producing the product. In addition, the invention has no waste residue and waste liquid discharge.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The carbon dioxide trapping and desorbing system comprises an adsorption device, a desorption device and a cooling device, and is characterized in that at least two groups of thin-layer bubbling bed components are stacked from top to bottom in the adsorption device, the main body of each group of thin-layer bubbling bed components is an air distribution hole plate, one end of the air distribution hole plate is a feeding end, the other end of the air distribution hole plate is a discharging end, a discharging pipe is arranged at the discharging end of the air distribution hole plate, and the lower end of the discharging pipe is open and is communicated with the feeding end of the next group of air distribution hole plate; the top of the adsorption device is provided with a gas outlet, the lower part of the adsorption device is provided with a flue gas inlet and an adsorbent discharge pipe, and the flue gas inlet and the adsorbent discharge pipe are connected with the middle part of the desorption device through a first conveying pipe;
the top of the desorption device is sequentially provided with a filter and a desorption gas outlet, the lower part of the desorption device is provided with a heating coil and a distributor, and the bottom of the desorption device is provided with a material outlet and is connected with the lower part of the cooling device through a second conveying pipe; a cooling pipe and a distribution pipe are arranged in the cooling device, and the top of the cooling device is connected with a lifting pipe; the upper end of the lifting pipe extends into the adsorption device.
2. The system for capturing and desorbing carbon dioxide from a spherical solid amine multistage thin bubble bed as claimed in claim 1, wherein each set of thin bubble bed assemblies further comprises an overflow weir at the discharge end of the gas distribution hole plate, and the fluidized material at the discharge end passes over the overflow weir into the discharge pipe.
3. The system for capturing and desorbing carbon dioxide in a spherical solid amine multistage thin layer bubbling bed according to claim 2, wherein the height of the overflow weir is between 30 and 100 mm.
4. The spherical solid amine multistage thin layer bubbling bed carbon dioxide capture and desorption system according to any one of claims 1 to 3, wherein the feed pipe is located outside and/or inside the shell of the adsorption device; and a flue gas filter is also arranged in front of the gas outlet at the top of the adsorption device.
5. The spherical solid amine multistage thin layer bubbling bed carbon dioxide capture and desorption system according to claim 4, wherein the bubbling bed thickness of each group of thin layer bubbling bed components is between 50 and 100 mm.
6. The system for capturing and desorbing carbon dioxide in a spherical solid amine multistage thin-layer bubbling bed according to claim 4, wherein 2-6 groups of thin-layer bubbling bed components are stacked from top to bottom in the adsorption device.
7. A method for capturing and desorbing carbon dioxide in a spherical solid amine multistage thin-layer bubbling bed comprises the following steps:
a spherical solid amine multistage thin layer bubbling bed carbon dioxide capture and desorption system according to any one of claims 1 to 6; the flue gas is introduced from a flue gas inlet at the lower part of the adsorption device, fluidizes spherical solid amine adsorbent particles and is adsorbed to trap CO in the flue gas2；
Adsorption of CO2The adsorbent material enters a desorption device through an adsorbent discharge pipe and a first conveying pipe, and fluidized steam or CO2Introducing gas from the distributor, heating the adsorbent material by the heating coil for desorption to obtain CO2Producing a product;
the desorbed solid amine particles enter the cooling device from a material outlet at the bottom of the desorption device through a second conveying pipe, and the fluidized air is introduced from the distribution pipe to cool the solid amine particles and is conveyed to the inside of the adsorption device through the riser for recycling.
8. The method of claim 7, wherein the spherical solid amine sorbent captures 30-100 g of CO2In kilograms.
9. The method according to claim 7, wherein the adsorption trapping is performed at 40 to 80 ℃ under 100 to 120kPa for 1 to 10 seconds.
10. The method according to any one of claims 7 to 9, wherein the adsorbent is heated to 80 to 110 ℃ and the desorption is carried out for 3 to 10 minutes.
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| CN115193246A (en) * | 2022-08-16 | 2022-10-18 | 北京德润晨环保科技有限公司 | Amine adsorbent desorption carbon dioxide capture device |
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