Flue gas pretreatment device and method for carbon dioxide capture

Abstract

The invention relates to the technical field of carbon dioxide capture, in particular to a flue gas pretreatment device and method.The pretreatment device comprises a pretreatment mechanism, the pretreatment mechanism comprises a pretreatment barrel and a liquid supply device for conveying reaction liquid into the pretreatment barrel, and a gas guide inner barrel is arranged at the bottom of the pretreatment barrel; a plurality of exhaust barrels are arranged on the side face of the air guide inner barrel and communicated with the interior of the air guide inner barrel through air guide holes, exhaust holes are formed in the surfaces of the exhaust barrels, an air inlet outer pipe is arranged at the bottom of the air guide inner barrel, an inner sealing barrel is slidably arranged in the air guide inner barrel and the air inlet outer pipe, and dredging holes corresponding to the air guide holes are formed in the side face of the inner sealing barrel. According to the pretreatment device, in practical application, the pretreatment mechanism and the liquid supply device are arranged, and the flue gas subjected to dust removal is subjected to chemical treatment, so that the reaction treatment efficiency of other gases in the flue gas can be effectively improved, and the situation that untreated flue gas is directly used for carbon capture and the carbon capture effect is influenced is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide capture, in particular to a flue gas pretreatment device and method for carbon dioxide capture. BACKGROUND

[0002] The CO2 capture system is generally composed of a flue gas pretreatment system, a packed absorption tower, a packed regeneration tower, an exhaust gas washing system, a solution boiler, an amine recovery heater, a product gas treatment system (including a condenser, a gas-liquid separator and a compressor) and a system water balance maintenance system. The specific CO2 capture process is as follows: the flue gas is sent into the absorption tower by the induced draft fan, wherein the CO2 is absorbed by the amine solution, and the tail gas is discharged into the atmosphere from the top of the tower; the rich liquid after absorbing CO2 is pumped from the bottom of the tower into the heat exchanger, and after recovering heat, it is sent into the regeneration tower; the CO2 gas desorbed is sent into the fine treatment system after treatment; after compression, pressure increase, moisture removal, desulfurization and refrigeration processes, liquid CO2 is finally obtained.

[0003] At present, the CO2 capture system is widely used in the chemical industry for capturing and recycling CO2 in flue gas. However, flue gas is a mixture of gas and smoke, and its composition is complex. The specific gas includes water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons and nitrogen oxides, etc. The smoke includes ash, coal particles, oil droplets and high-temperature cracking products of fuel, etc. If the smoke and other gases in the flue gas are not effectively removed before capturing and recycling CO2 in the flue gas, it will directly affect the overall capture effect of the CO2 capture system on CO2 in the flue gas, and there is also the problem of high energy consumption.

[0004] Therefore, there is an urgent need for a flue gas pretreatment device and method for carbon dioxide capture to solve the above problems. SUMMARY

[0005] The present application aims to solve the problem that the chemical flue gas in the prior art is directly introduced into the CO2 capture system without pretreatment, which affects the overall capture effect of the CO2 capture system on CO2 in the flue gas, and provides a flue gas pretreatment device and method for carbon dioxide capture.

[0006] To achieve the above objectives, a first aspect of the present invention provides a flue gas pretreatment device for carbon dioxide capture. The pretreatment device includes a pretreatment mechanism for pretreating flue gas. The pretreatment mechanism includes a pretreatment cylinder and a liquid supply device for conveying a reaction liquid into the pretreatment cylinder. A gas guiding inner cylinder is provided at the center of the bottom of the pretreatment cylinder. A plurality of exhaust pipes are provided on the side of the gas guiding inner cylinder. The exhaust pipes are connected to the interior of the gas guiding inner cylinder through gas guiding holes. A plurality of exhaust holes are opened on the surface of the exhaust pipes. An air inlet outer pipe is provided at the bottom of the gas guiding inner cylinder. An inner sealing cylinder is slidably provided inside the gas guiding inner cylinder and the air inlet outer pipe. A guide hole corresponding to the gas guiding hole is opened on the side of the inner sealing cylinder for guiding the flue gas entering the inner sealing cylinder into the pretreatment cylinder.

[0007] Preferably, a spring is installed between the top of the inner sealing cylinder and the inner top of the air guiding inner cylinder, and a limiting member is installed in the middle of the inner side of the air guiding inner cylinder.

[0008] Preferably, an inner shaft is rotatably mounted at the top center of the inner sealing cylinder via a sealing rotating component. A plurality of impellers are fitted at one end of the inner shaft extending into the inner sealing cylinder, and a plurality of sliding protrusions are spaced apart at the outer side of the end extending into the air guiding inner cylinder. An outer shaft is mounted at the top center of the air guiding inner cylinder via a sealing rotating component. A plurality of stirring racks are fitted at one end of the outer shaft extending into the pretreatment cylinder, and a sliding groove matching the sliding protrusions is provided at the other end extending into the air guiding inner cylinder.

[0009] Preferably, a scraper is provided at one end of the outer shaft extending to the pretreatment cylinder, and the scraping surface of the scraper abuts against the inner surface of the pretreatment cylinder.

[0010] Preferably, a plurality of the exhaust pipes are arranged in a ring array along the lower side of the air guide inner cylinder.

[0011] Preferably, it further includes a drying mechanism, which includes a drying component and a heat recovery component. The heat recovery component is used to recover the reaction heat in the pretreatment mechanism, and the drying component is used to dry the flue gas after pretreatment by the pretreatment mechanism based on the recovered reaction heat.

[0012] Preferably, the drying assembly includes a drying cylinder with several drying holes on its side. A drying frame is provided at each of the drying holes. A guide fan is installed on the end face of the drying frame opposite to the drying holes. A circulation pipe is provided inside the drying frame. The heat recovery assembly includes a spiral tube and a heat transfer fluid delivery device. The spiral tube is wound around the outer surface of the pretreatment cylinder. The heat transfer fluid delivery device is used to realize the circulation of heat transfer fluid in the circulation pipe and the spiral tube.

[0013] Preferably, the pretreatment cylinder and the drying cylinder are connected by a slow-air cylinder.

[0014] Preferably, the spiral tube is mounted on the surface of the pretreatment cylinder via a heat-conducting frame.

[0015] Preferably, it further includes an adsorption component for adsorbing the flue gas after it has been dried by the drying component.

[0016] Preferably, the adsorption assembly includes an adsorption cylinder, and a plurality of activated carbon adsorption plates are disposed inside the adsorption cylinder.

[0017] Preferably, the air inlet end of the air inlet pipe is connected to the air outlet end of the booster pump mechanism via an L-shaped air guide pipe, and the air inlet end of the booster pump mechanism is connected to an air inlet pipe.

[0018] Preferably, the liquid supply device includes a guide pipe communicating with the bottom of the pretreatment cylinder and a flow control valve installed on the guide pipe.

[0019] A second aspect of the present invention provides a method for pretreating flue gas for carbon dioxide capture, the pretreatment method being implemented in the aforementioned pretreatment apparatus, the pretreatment method comprising the following steps:

[0020] S1. The flue gas after dust removal is fed into the pretreatment mechanism for pretreatment;

[0021] S2. The reaction heat in the pretreatment unit is recovered through the heat recovery component of the drying unit, and the flue gas pretreated by the pretreatment unit is input into the drying component of the drying unit for drying.

[0022] S3. The flue gas dried by the drying component is fed into the adsorption component for adsorption treatment, and the flue gas after adsorption treatment is fed into the carbon dioxide capture system.

[0023] Preferably, the reaction solution is a sodium hydroxide or sodium carbonate solution.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] By setting up a pretreatment mechanism to chemically treat the flue gas after dust removal, the reaction efficiency of other gases in the flue gas can be effectively improved. At the same time, by setting up a scraper structure to clean the inner wall of the pretreatment cylinder, it is possible to prevent the precipitates generated during the chemical reaction from adhering to the inner wall of the pretreatment cylinder and affecting the treatment effect of subsequent flue gas. Furthermore, by using a drying component and a heat recovery component to recover the heat released during the reaction between the chemical reaction liquid and the flue gas, it can be used to dry the chemically treated flue gas, which can further treat other gas components in the flue gas and improve energy utilization. Furthermore, by setting up an adsorption component to adsorb the dried flue gas, it can further treat other gas components in the flue gas, thereby improving the CO2 capture effect of the subsequent CO2 capture system. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a flue gas pretreatment device for carbon dioxide capture.

[0027] Figure 2 This is a schematic diagram of the pretreatment mechanism of a flue gas pretreatment device for carbon dioxide capture;

[0028] Figure 3 This is a structural diagram of the pretreatment mechanism's air guide cylinder, exhaust cylinder, and inner sealing cylinder;

[0029] Figure 4 This is an exploded structural diagram of the pretreatment mechanism's air guide cylinder, exhaust cylinder, and inner sealing cylinder;

[0030] Figure 5 This is a structural diagram of the inner shaft of the inner sealing cylinder and the outer shaft of the air guiding inner cylinder;

[0031] Figure 6 This is a schematic diagram of the drying component and heat recovery component of a flue gas pretreatment device for carbon dioxide capture.

[0032] Figure 7 This is a schematic diagram of the adsorption component of a flue gas pretreatment device for carbon dioxide capture.

[0033] Explanation of reference numerals in the attached figures

[0034] 1. Support frame; 2. Gas release cylinder; 3. Pretreatment mechanism; 31. Pretreatment cylinder; 32. Outer air inlet pipe; 33. Air guide pipe; 34. Inner air guide cylinder; 35. Exhaust pipe; 351. Exhaust port; 352. Air guide hole; 36. Inner sealing cylinder; 361. Drainage hole; 37. Inner shaft; 371. Sliding rib; 372. Impeller; 38. Outer shaft; 381. Sliding groove; 39. Stirring frame; 310. Spring; 311. Scraper frame; 312. Limiting component; 4. Drying assembly; 41. Drying cylinder; 411. Drying hole; 4 2. Drying frame; 43. Guide fan; 44. Circulation pipe; 5. Heat recovery assembly; 51. Heat conduction frame; 52. Spiral tube; 521. First tube; 522. Third tube; 53. Second tube; 54. First liquid pump mechanism; 541. First connector; 55. Fourth tube; 56. Second liquid pump mechanism; 561. Second connector; 6. Adsorption assembly; 61. Adsorption cylinder; 62. Activated carbon adsorption plate; 7. Top cylinder; 8. Booster pump mechanism; 9. Air inlet pipe; 10. Air outlet pipe; 11. Flow control valve; 12. Guide pipe. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0036] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of indicated technical features. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean a non-exclusive inclusion, the possibility of the presence or addition of one or more other features, units, components, and / or combinations thereof.

[0037] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The first aspect of this invention provides a flue gas pretreatment device for carbon dioxide capture, such as... Figures 1-5As shown, the pretreatment device includes a pretreatment mechanism 3 for pretreating flue gas. The pretreatment mechanism 3 includes a pretreatment cylinder 31 and a liquid supply device for conveying reaction liquid into the pretreatment cylinder 31. A gas-guiding inner cylinder 34 is centrally located at the bottom of the pretreatment cylinder 31. Several exhaust pipes 35 are arranged on the side of the gas-guiding inner cylinder 34. The exhaust pipes 35 communicate with the interior of the gas-guiding inner cylinder 34 through gas-guiding holes 352. Several exhaust holes 351 are opened on the surface of the exhaust pipes 35. An air-inlet outer pipe 32 is arranged at the bottom of the gas-guiding inner cylinder 34. An inner sealing cylinder 36 is slidably arranged inside the gas-guiding inner cylinder 34 and the air-inlet outer pipe 32. A guide hole 361 corresponding to the gas-guiding holes 352 is opened on the upper side of the inner sealing cylinder 36 for guiding the flue gas entering the inner sealing cylinder 36 into the pretreatment cylinder 31. The pretreatment cylinder 31 is mounted on a support frame 1. The air guide inner cylinder 34 and the air intake outer pipe 32 are integrally molded.

[0039] Specifically, the air inlet end of the outer air inlet pipe 32 is connected to the air outlet end of the booster pump mechanism 8 via an L-shaped air guide pipe 33, and the air inlet end of the booster pump mechanism 8 is connected to an air inlet pipe 9. Preferably, the L-shaped air guide pipe 33 and the outer air inlet pipe 32 are integrally formed, thereby enabling air intake while limiting the position of the inner sealing cylinder 36. The liquid supply device includes a flow guide pipe 12 communicating with the bottom of the pretreatment cylinder 31 and a flow control valve 11 installed on the flow guide pipe 12, so that in practical applications, the flow control valve 11 can be used to allow the reaction liquid to enter the pretreatment cylinder 31 and the reaction waste liquid to be discharged after the reaction.

[0040] According to the above technical solution, based on this flue gas pretreatment device for carbon dioxide capture, in practical application, the flow control valve 11 is opened, and a set amount of the reaction liquid is introduced into the pretreatment cylinder 31 through the guide pipe 12. The booster pump mechanism 8 is started, and the flue gas after dust removal enters the booster pump mechanism 8 through the inlet pipe 9. Then, the pressurized flue gas enters the outer inlet pipe 32 through the L-shaped guide pipe 33. The high-pressure flue gas entering the outer inlet pipe 32 pushes the inner sealing cylinder 36 to slide vertically upward along the outer inlet pipe 32 and the inner guide cylinder 34, so that the guide hole 361 on its upper side corresponds to and communicates with the guide hole 352 that connects the exhaust pipe 35 and the inner guide cylinder 34. This allows the high-pressure gas to enter the pretreatment cylinder 31 evenly through several exhaust holes 351 and fully mix and react with the reaction liquid inside, thereby effectively improving the reaction treatment efficiency of other gases in the flue gas.

[0041] In the flue gas pretreatment device for carbon dioxide capture described in this invention, preferably, as follows: Figure 3As shown, a spring 310 is installed between the top of the inner sealing cylinder 36 and the inner top of the air guiding inner cylinder 34. A limiting member 312 is installed in the middle of the inner side of the air guiding inner cylinder 34. The limiting member 312 can be, for example, a locking block, and is evenly distributed around the middle of the inner side of the air guiding inner cylinder 34, without interfering with the vertical movement of the spring 310. Specifically, one end of the spring 310 is fixedly connected to the inner top of the air guiding inner cylinder 34.

[0042] In practical applications, when the high-pressure flue gas entering the outer intake pipe 32 pushes the inner sealing cylinder 36 to slide vertically upward along the outer intake pipe 32 and the inner air guide cylinder 34, the spring 310 is compressed. Then, the top of the inner sealing cylinder 36 is positioned at the limiting member 312, so that the guide hole 361 corresponds to and communicates with the guide hole 352 connecting the exhaust pipe 35 and the inner air guide cylinder 34. When the high-pressure flue gas is stopped, under the action of the spring force of the spring 310, the inner sealing cylinder 36 quickly moves downward to the initial position (i.e., in the initial state, the guide hole 352 connecting the exhaust pipe 35 and the inner air guide cylinder 34 is sealed by the side of the inner sealing cylinder 36), thereby effectively preventing the reaction liquid in the pretreatment cylinder 31 from entering the inner air guide cylinder 34.

[0043] In the flue gas pretreatment device for carbon dioxide capture described in this invention, preferably, as follows: Figures 3-5 As shown, an inner shaft 37 is rotatably mounted at the top center of the inner sealing cylinder 36 via a sealing rotating component. Several impellers 372 are fitted onto one end of the inner shaft 37 extending into the inner sealing cylinder 36, and several sliding protrusions 371 are spaced apart on the outer side of the end extending into the air guiding inner cylinder 34. An outer shaft 38 is mounted at the top center of the air guiding inner cylinder 34 via a sealing rotating component. Several stirring racks 39 are fitted onto one end of the outer shaft 38 extending into the pretreatment cylinder 31, and a sliding groove 381, matching the sliding protrusions 371, is provided at the other end extending into the air guiding inner cylinder 34. Specifically, the sealing rotating component can be a bearing.

[0044] In practical applications, when the high-pressure flue gas entering the outer inlet pipe 32 pushes the inner sealing cylinder 36 to slide vertically upward along the outer inlet pipe 32 and the inner guide cylinder 34, the inner shaft 37 at the top center of the inner sealing cylinder 36 rises vertically in sync. This causes several sliding protrusions 371 on the outer side of the top of the inner shaft 37 to rise along the sliding grooves 381 of the outer shaft 38. At the same time, several impellers 372 at the bottom of the inner shaft 37 rotate under the drive of the high-pressure flue gas, thereby driving the inner shaft 37 to rotate axially. This, in turn, drives several stirring racks 39 on the outer shaft 38 to rotate synchronously to stir the reaction liquid in the pretreatment cylinder 31, so that the flue gas can react better with the reaction liquid, thereby effectively removing other gases from the flue gas.

[0045] In a further preferred embodiment, a scraper 311 is also provided at one end of the outer shaft 38 extending to the pretreatment cylinder 31, and the scraping surface of the scraper 311 abuts against the inner surface of the pretreatment cylinder 31. Specifically, as follows... Figure 3 As shown, while the outer shaft 38 rotates, the scraper 311 rotates synchronously to clean the inner wall of the pretreatment cylinder 31, preventing precipitates generated during the chemical reaction from adhering to the inner wall of the pretreatment cylinder and affecting the treatment effect on subsequent flue gas. In one specific embodiment, a scraper rotating component is fitted onto the lower outer side of the inner gas guide cylinder 34, and one end of the bottom of the scraper 311 is rotatably connected to the inner gas guide cylinder 34 via the scraper rotating component. Specifically, the scraper rotating component can be a bearing.

[0046] In the flue gas pretreatment device for carbon dioxide capture according to the present invention, preferably, a plurality of exhaust stacks 35 are arranged in a ring array along the lower side of the inner gas guide cylinder 34. Specifically, the number of exhaust stacks 35 can be three or more. Preferably, three exhaust stacks 35 are provided, and the three exhaust stacks 35 arranged in a ring array along the inner gas guide cylinder 34 are integrally formed with the inner gas guide cylinder 34, so that the flue gas enters the pretreatment cylinder 31 more evenly to react with the reaction liquid, thereby better treating other gases in the flue gas.

[0047] In the flue gas pretreatment device for carbon dioxide capture according to the present invention, preferably, the pretreatment device further includes a drying mechanism, the drying mechanism includes a drying component 4 and a heat recovery component 5, the heat recovery component 5 is used to recover the reaction heat in the pretreatment mechanism 3, and the drying component 4 is used to dry the flue gas after pretreatment by the pretreatment mechanism 3 based on the recovered reaction heat, thereby further treating other gas components in the flue gas and improving the energy utilization rate, thereby improving the CO2 capture effect of the subsequent CO2 capture system.

[0048] Specifically, such as Figure 6 As shown, the drying assembly 4 includes a drying cylinder 41. The pretreatment cylinder 31 and the drying cylinder 41 are connected by a gas-releasing cylinder 2. The drying cylinder 41 has several drying holes 411 on its side. A drying frame 42 is provided at each of the drying holes 411. A guide fan 43 is installed on the end face of the drying frame 42 opposite to the drying holes 411. A circulation pipe 44 is provided inside the drying frame 42. The heat recovery assembly 5 includes a spiral tube 52 and a heat transfer fluid delivery device. The spiral tube 52 is wound around the outer surface of the pretreatment cylinder 31. The heat transfer fluid delivery device is used to realize the circulation of heat transfer fluid in the circulation pipe 44 and the spiral tube 52.

[0049] More specifically, a first tube 521 is fixedly installed at the top of the spiral tube 52, a second tube 53 is fixedly installed at the top of the first tube 521, a first liquid pump mechanism 54 is fixedly installed at the top of the second tube 53, a first connector 541 is fixedly installed at the output end of the first liquid pump mechanism 54, one end of the circulation tube 44 is fixedly connected to the first connector 541, a third tube 522 is fixedly installed at the bottom of the spiral tube 52, a fourth tube 55 is fixedly installed at the end of the third tube 522, a second liquid pump mechanism 56 is fixedly installed at the end of the fourth tube 55, a second connector 561 is fixedly installed at the output end of the second liquid pump mechanism 56, and the other end of the circulation tube 44 is connected to the second connector 561. 61 is fixedly connected. In use, the first liquid guiding pump mechanism 54 and the second liquid guiding pump mechanism 56 are turned on. The heat-conducting liquid in the spiral tube 52 carries heat and is input into the circulation tube 44 through the first pipe 521, the second pipe 53 and the first connector 541. The heat released when the reaction liquid and flue gas react is transferred to the circulation tube 44. At this time, the guide fan 43 is turned on. The airflow carries heat through the circulation tube 44 and is heated. It is then input into the drying cylinder 41 unidirectionally through multiple drying holes 411, thereby drying the flue gas introduced into the drying cylinder 41, which facilitates the effective capture of CO2 in the subsequent process. The heat-conducting liquid in the circulation tube 44 enters the spiral tube 52 again through the second connector 561, the fourth pipe 55 and the third pipe 522, realizing the recycling of heat.

[0050] In a further preferred embodiment, such as Figure 6 As shown, the spiral tube 52 is mounted on the surface of the pretreatment cylinder 31 via a heat-conducting frame 51, thereby improving the recovery rate of reaction heat and thus better drying the flue gas. Specifically, as Figure 1 and Figure 6 As shown, the heat-conducting frame 51 is annular and is fitted onto the surface of the pretreatment cylinder 31, and the annular interior is provided with a spiral channel that matches the spiral tube 52.

[0051] In the flue gas pretreatment device for carbon dioxide capture described in this invention, preferably, the pretreatment device further includes an adsorption component 6 for adsorbing the flue gas after it has been dried by the drying component 4, thereby improving the CO2 capture efficiency of the subsequent CO2 capture system. Specifically, as... Figure 1 and 7 As shown, the adsorption assembly 6 includes an adsorption cylinder 61, inside which are arranged several activated carbon adsorption plates 62. The adsorption cylinder 61 is located at the top of the drying cylinder 41, and a top cylinder 7 is provided at the top of the adsorption cylinder 61. An air outlet pipe 10 is provided on the top cylinder 7.

[0052] In a preferred embodiment, the flue gas pretreatment device for carbon dioxide capture according to the present invention is as follows: Figure 1 The settings are shown.

[0053] A second aspect of the present invention provides a method for pretreating flue gas for carbon dioxide capture, wherein the pretreatment method is implemented in the pretreatment apparatus described above, and the pretreatment method includes the following steps:

[0054] S1. The flue gas after dust removal is fed into the pretreatment unit 3 for pretreatment.

[0055] S2. The reaction heat in the pretreatment unit 3 is recovered through the heat recovery component of the drying unit, and the flue gas pretreated by the pretreatment unit 3 is input into the drying component 4 of the drying unit for drying.

[0056] S3. The flue gas dried by the drying component 4 is fed into the adsorption component 6 for adsorption treatment, and the adsorbed flue gas is fed into the carbon dioxide capture system.

[0057] According to the above technical solution, by setting up a pretreatment mechanism to chemically treat the flue gas after dust removal, the reaction treatment efficiency of other gases in the flue gas can be effectively improved. At the same time, by setting up a scraper structure to clean the inner wall of the pretreatment cylinder, it is possible to prevent the precipitates generated during the chemical reaction from adhering to the inner wall of the pretreatment cylinder and affecting the treatment effect of subsequent flue gas. Furthermore, by using a drying component and a heat recovery component to recover the heat released during the reaction between the chemical reaction liquid and the flue gas, it can be used to dry the chemically treated flue gas, which can further treat other gas components in the flue gas and improve energy utilization. Furthermore, by setting up an adsorption component to adsorb the dried flue gas, it can further treat other gas components in the flue gas, thereby improving the CO2 capture effect of the subsequent CO2 capture system.

[0058] In the flue gas pretreatment method for carbon dioxide capture described in this invention, preferably, the reaction solution is a sodium hydroxide or sodium carbonate solution, but other solutions can be added as needed.

[0059] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0060] Example 1

[0061] Adopting such Figures 1-7The illustrated flue gas pretreatment device for carbon dioxide capture is implemented in the following way: Specifically, the pretreatment device includes a pretreatment mechanism 3 for pretreating the flue gas. The pretreatment mechanism 3 includes a pretreatment cylinder 31 and a liquid supply device for conveying reaction liquid into the pretreatment cylinder 31. A gas-guiding inner cylinder 34 is disposed at the center of the bottom of the pretreatment cylinder 31. A plurality of exhaust pipes 35 are disposed on the lower side of the gas-guiding inner cylinder 34. The exhaust pipes 35 communicate with the interior of the gas-guiding inner cylinder 34 through gas guide holes 352. The surface of the exhaust pipe 35 is provided with a plurality of exhaust holes 351. The bottom of the air guide inner cylinder 34 is provided with an air inlet outer pipe 32. An inner sealing cylinder 36 is slidably disposed inside the air guide inner cylinder 34 and the air inlet outer pipe 32. The upper side of the inner sealing cylinder 36 is provided with a guide hole 361 corresponding to the air guide hole 352, which is used to guide the flue gas entering the inner sealing cylinder 36 into the pretreatment cylinder 31. The three exhaust pipes 35 are arranged in a ring array along the lower side of the air guide inner cylinder 34.

[0062] A spring 310 is installed between the top of the inner sealing cylinder 36 and the inner top of the air guiding inner cylinder 34, and a limiting member 312 is installed in the middle of the inner side of the air guiding inner cylinder 34; the air inlet end of the air inlet pipe 32 is connected to the air outlet end of the booster pump mechanism 8 through an L-shaped air guiding pipe 33, and the air inlet end of the booster pump mechanism 8 is connected to an air inlet pipe 9; the liquid supply device includes a guide pipe 12 communicating with the bottom of the pretreatment cylinder 31 and a flow control valve 11 installed on the guide pipe 12.

[0063] In practical applications, the flow control valve 11 is opened, and the set amount of reaction liquid is introduced into the pretreatment cylinder 31 through the guide pipe 12. The booster pump mechanism 8 is started, and the flue gas after dust removal enters the booster pump mechanism 8 through the air inlet pipe 9. Then, the pressurized flue gas enters the outer air inlet pipe 32 through the L-shaped air guide pipe 33. The high-pressure flue gas entering the outer air inlet pipe 32 pushes the inner sealing cylinder 36 to slide vertically upward along the outer air inlet pipe 32 and the inner air guide cylinder 34, so that the guide hole 361 on its upper side is connected to the air guide hole of the exhaust pipe 35 and the inner air guide cylinder 34, so that the high-pressure gas enters the pretreatment cylinder 31 evenly through several exhaust holes 351 and is fully mixed and reacted with the reaction liquid inside.

[0064] Testing has shown that the flue gas pretreatment device for carbon dioxide capture described in this invention can effectively improve the reaction and treatment efficiency of other gases in the flue gas.

[0065] Example 2

[0066] Referring to Embodiment 1, the difference is that an inner shaft 37 is rotatably mounted on the top center of the inner sealing cylinder 36 via a sealing rotating component. A plurality of impellers 372 are sleeved on one end of the inner shaft 37 extending into the inner sealing cylinder 36, and a plurality of sliding protrusions 371 are spaced apart on the outer side of the end extending into the air guiding inner cylinder 34. An outer shaft 38 is mounted on the top center of the air guiding inner cylinder 34 via a sealing rotating component. A plurality of stirring racks 39 are sleeved on one end of the outer shaft 38 extending into the pretreatment cylinder 31, and a sliding groove 381 matching the sliding protrusions 371 is provided on the other end extending into the air guiding inner cylinder 34. A scraper 311 is also provided on the end of the outer shaft 38 extending into the pretreatment cylinder 31, and the scraping surface of the scraper 311 abuts against the inner surface of the pretreatment cylinder 31.

[0067] In practical applications, when the high-pressure flue gas entering the outer intake pipe 32 pushes the inner sealing cylinder 36 to slide vertically upward along the outer intake pipe 32 and the inner guide cylinder 34, the inner shaft 37 at the top center of the inner sealing cylinder 36 rises vertically in sync, causing several sliding protrusions 371 on the outer side of the top of the inner shaft 37 to rise along the sliding grooves 381 of the outer shaft 38. At the same time, several impellers 372 at the bottom of the inner shaft 37 rotate under the drive of the high-pressure flue gas, thereby driving the inner shaft 37 to rotate axially, which in turn drives several stirring racks 39 on the outer shaft 38 to rotate synchronously to stir the reaction liquid in the pretreatment cylinder 31, and the scraper 311 on the outer shaft 38 to clean the inner wall of the pretreatment cylinder 31.

[0068] Testing revealed that, compared to the scheme in Example 1, the flue gas pretreatment device for carbon dioxide capture described in this invention enables the flue gas to react better with the reaction liquid, thereby more effectively removing other gases from the flue gas and preventing precipitates generated during chemical reaction from adhering to the inner wall of the pretreatment cylinder and affecting the subsequent flue gas treatment effect.

[0069] Example 3

[0070] Referring to Embodiment 2, the difference is that it also includes a drying mechanism, which includes a drying component 4 and a heat recovery component 5. The heat recovery component 5 is used to recover the reaction heat in the pretreatment mechanism 3, and the drying component 4 is used to dry the flue gas after pretreatment by the pretreatment mechanism 3. The drying component 4 includes a drying cylinder 41, and a plurality of drying holes 411 are opened on the side of the drying cylinder 41. A drying frame 42 is provided at the plurality of drying holes 411, and the drying frame 42 is opposite to the plurality of drying holes. A flow guide fan 43 is installed on the end face of 411. A circulation pipe 44 is provided inside the drying frame 42. The heat recovery assembly 5 includes a spiral tube 52 and a heat transfer fluid delivery device. The spiral tube 52 is wound around the outer surface of the pretreatment cylinder 31. The heat transfer fluid delivery device is used to realize the circulation flow of the heat transfer fluid in the circulation pipe 44 and the spiral tube 52. The spiral tube 52 is installed on the surface of the pretreatment cylinder 31 through the heat transfer frame 51. The pretreatment cylinder 31 and the drying cylinder 41 are connected by a slow-air cylinder 2.

[0071] Testing revealed that, compared to the scheme in Example 2, the flue gas pretreatment device for carbon dioxide capture described in this invention, by further recovering the heat of reaction to dry the flue gas after chemical reaction treatment, can further treat other gas components in the flue gas and improve energy utilization, thereby improving the CO2 capture effect of the subsequent CO2 capture system.

[0072] Example 4

[0073] Referring to Embodiment 3, the difference is that it also includes an adsorption component 6 for adsorbing the flue gas after it has been dried by the drying component 4; the adsorption component 6 includes an adsorption cylinder 61, and a plurality of activated carbon adsorption plates 62 are disposed inside the adsorption cylinder 61; the adsorption cylinder 61 is disposed on the top of the drying cylinder 41, and a top cylinder 7 is disposed on the top of the adsorption cylinder 61, and an exhaust pipe 10 is disposed on the top cylinder 7.

[0074] Testing revealed that, compared to the scheme in Example 3, the flue gas pretreatment device for carbon dioxide capture described in this invention, by setting up activated carbon adsorption plates to adsorb and treat the dried flue gas, can further treat other gas components in the flue gas, thereby improving the CO2 capture effect of the subsequent CO2 capture system.

[0075] The present invention provides a flue gas pretreatment device and method for carbon dioxide capture. By setting up a pretreatment mechanism to chemically treat the flue gas after dust removal, the reaction treatment efficiency of other gases in the flue gas can be effectively improved. At the same time, by setting up a scraper structure to clean the inner wall of the pretreatment cylinder, it can prevent the precipitates generated during the chemical reaction from adhering to the inner wall of the pretreatment cylinder and affecting the treatment effect of subsequent flue gas. Furthermore, by setting up a drying component and a heat recovery component to recover the heat released during the reaction between the chemical reaction liquid and the flue gas, it can be used to dry the chemically treated flue gas, which can further treat other gas components in the flue gas and improve energy utilization. Furthermore, by setting up an adsorption component to adsorb the dried flue gas, it can further treat other gas components in the flue gas, thereby improving the CO2 capture effect of the subsequent CO2 capture system.

[0076] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A flue gas pre-treatment device for carbon dioxide capture, characterized by The pretreatment device comprises a pretreatment mechanism (3) for pretreating flue gas, the pretreatment mechanism (3) comprises a pretreatment cylinder (31) and a liquid supply device for supplying reaction liquid into the pretreatment cylinder (31), a gas guide inner cylinder (34) is arranged at the center of the inner bottom of the pretreatment cylinder (31), a plurality of exhaust cylinders (35) are arranged on the side surface of the gas guide inner cylinder (34), the exhaust cylinders (35) are communicated with the inside of the gas guide inner cylinder (34) through gas guide holes (352), a plurality of exhaust holes (351) are arranged on the surface of the exhaust cylinders (35), an air inlet outer pipe (32) is arranged at the bottom of the gas guide inner cylinder (34), an inner sealing cylinder (36) is slidably arranged in the inside of the gas guide inner cylinder (34) and the air inlet outer pipe (32), a plurality of guide holes (361) corresponding to the gas guide holes (352) are arranged on the side surface of the inner sealing cylinder (36) for guiding the flue gas entering the inner sealing cylinder (36) into the pretreatment cylinder (31).

2. The flue gas pre-treatment device for carbon dioxide capture according to claim 1, characterized by, A spring (310) is arranged between the top of the inner sealing cylinder (36) and the inner top of the gas guide inner cylinder (34), and a limiting piece (312) is arranged at the middle of the inner side of the gas guide inner cylinder (34).

3. The flue gas pre-treatment device for carbon dioxide capture according to claim 1, characterized by, An inner shaft (37) is rotatably arranged at the center of the top of the inner sealing cylinder (36) through a sealing rotating piece, a plurality of impellers (372) are arranged on one end of the inner shaft (37) extending into the inner sealing cylinder (36), a plurality of clamping sliding convex strips (371) are arranged on the outer side of one end of the inner shaft (37) extending into the gas guide inner cylinder (34), an outer shaft (38) is arranged at the center of the top of the gas guide inner cylinder (34) through a sealing rotating piece, a plurality of stirring frames (39) are arranged on one end of the outer shaft (38) extending into the pretreatment cylinder (31), and a clamping sliding groove (381) matched with the clamping sliding convex strips (371) is arranged on one end of the outer shaft (38) extending into the gas guide inner cylinder (34).

4. The flue gas pre-treatment apparatus for carbon dioxide capture according to claim 3, characterized by, One end of the outer shaft (38) extending into the pretreatment cylinder (31) is further provided with a scraping frame (311), and the scraping surface of the scraping frame (311) abuts against the inner surface of the pretreatment cylinder (31).

5. The flue gas pre-treatment device for carbon dioxide capture according to claim 1, characterized by, A plurality of the exhaust cylinders (35) are arranged in a ring array along the lower side surface of the gas guide inner cylinder (34).

6. The flue gas pre-treatment apparatus for carbon dioxide capture according to any one of claims 1 to 5, characterized in that, The device further comprises a drying mechanism, the drying mechanism comprises a drying assembly (4) and a heat recovery assembly (5), the heat recovery assembly (5) is used for recovering reaction heat in the pretreatment mechanism (3), and the drying assembly (4) is used for drying the flue gas after pretreatment by the pretreatment mechanism (3) based on the recovered reaction heat.

7. The flue gas pre-treatment apparatus for carbon dioxide capture according to claim 6, characterized by The drying assembly (4) comprises a drying cylinder (41), a plurality of drying holes (411) are formed in the side surface of the drying cylinder (41), a drying frame (42) is arranged at the plurality of drying holes (411), a flow guide fan (43) is mounted on the end surface of the drying frame (42) relative to the plurality of drying holes (411), a circulating pipe (44) is arranged in the drying frame (42), the heat recovery assembly (5) comprises a spiral pipe (52) and a heat conducting liquid conveying device, the spiral pipe (52) is wound on the outer surface of the pretreatment cylinder (31), and the heat conducting liquid conveying device is used to realize the circulating flow of the heat conducting liquid in the circulating pipe (44) and the spiral pipe (52).

8. The flue gas pre-treatment device for carbon dioxide capture according to claim 7, characterized by The pretreatment cylinder (31) and the drying cylinder (41) are communicated through the air buffering cylinder (2).

9. The flue gas pre-treatment device for carbon dioxide capture according to claim 7, characterized by The spiral pipe (52) is mounted on the surface of the pretreatment cylinder (31) through a heat conducting frame (51).

10. The flue gas pre-treatment device for carbon dioxide capture according to claim 6, characterized by An adsorption assembly (6) is further arranged, which is used to perform adsorption treatment on flue gas after drying treatment by the drying assembly (4).

11. The flue gas pre-treatment apparatus for carbon dioxide capture according to claim 10, characterized by The adsorption assembly (6) comprises an adsorption cylinder (61), and a plurality of activated carbon adsorption plates (62) are arranged in the adsorption cylinder (61).

12. The flue gas pre-treatment apparatus for carbon dioxide capture according to claim 1, characterized by, The gas inlet end of the gas inlet outer pipe (32) is connected with the gas outlet end of the booster pump mechanism (8) through an L-shaped air guide pipe (33), and the gas inlet end of the booster pump mechanism (8) is connected with an air inlet pipe (9).

13. The flue gas pre-treatment apparatus for carbon dioxide capture according to claim 1, characterized by, The liquid supply device comprises a flow guide pipe (12) communicated with the bottom of the pretreatment cylinder (31) and a flow control valve (11) mounted on the flow guide pipe (12).

14. A flue gas pre-treatment method for carbon dioxide capture, characterized by, The pretreatment method is implemented in the pretreatment device according to any one of claims 1-13, and the pretreatment method comprises the following steps: S1, inputting flue gas after dust removal into the pretreatment mechanism (3) to perform pretreatment; S2, recovering reaction heat in the pretreatment mechanism (3) through the heat recovery assembly (5) of the drying mechanism, and inputting flue gas after pretreatment in the pretreatment mechanism (3) into the drying assembly (4) of the drying mechanism to perform drying treatment; S3, inputting flue gas after drying treatment in the drying assembly (4) into the adsorption assembly (6) to perform adsorption treatment, and inputting flue gas after adsorption treatment into a carbon dioxide capture system.

15. The flue gas pre-treatment method for carbon dioxide capture according to claim 14, characterized by, The reaction liquid is a sodium hydroxide or sodium carbonate solution.

Images