Desorption device and carbon dioxide capture plant

Abstract

This application discloses a desorption device and a carbon dioxide capture device. The desorption device includes a mounting shell, a blade guide assembly, and a disc assembly. The mounting shell has a mounting cavity, and an injection pipe for the solution to be desorbed is provided in the mounting cavity. The injection pipe has several injection through holes on its peripheral wall. The blade guide assembly is located in the mounting cavity and is rotatably sleeved outside the injection pipe. The disc assembly is located in the mounting cavity and includes a connecting cylinder and a disc group. The connecting cylinder is sleeved outside the blade guide assembly and is fixedly connected to the blade guide assembly. The connecting cylinder has several first flow holes on its peripheral wall. The disc group is located on the side of the connecting cylinder away from the blade guide assembly. Several discs in the disc group are arranged sequentially at intervals and staggered from the first flow holes along the length direction of the connecting cylinder. Several discs in the disc group are arranged in a wavy shape to improve the regeneration effect of the absorbent.

Description

Technical Field

[0001] This application belongs to the field of carbon dioxide capture technology, specifically relating to a desorption device and carbon dioxide capture equipment. Background Technology

[0002] Chemical amine absorption-desorption is a mature carbon capture technology and a major technological route for achieving large-scale carbon capture in various industries under the current dual-carbon scenario. Traditional chemical amines, including absorbents such as MEA and MDEA, have a long history of research and application and mature processes.

[0003] Multiphase absorbent is a new type of chemical absorbent that undergoes a phase change after absorbing carbon dioxide and generating carbonates, transforming from a single phase to two or even multiple phases. The lower layer of absorbent is rich in carbonates, and only this part needs to be regenerated by steam to complete the absorbent regeneration, which greatly reduces the amount of absorbent to be recycled in the process.

[0004] However, the viscosity of the rich absorbent formed after the multiphase absorbent absorbs carbon dioxide is 20-50 times that of water. In traditional regeneration towers, the effective gas-liquid mass transfer specific surface area is too small, the carbon dioxide desorption mass transfer resistance is large, and the mass transfer efficiency from the liquid phase to the gas phase is low, resulting in poor regeneration effect of the high-viscosity rich absorbent. Utility Model Content

[0005] In view of the above-mentioned defects or deficiencies, this application provides a desorption device and a carbon dioxide capture device, which aims to solve the technical problem of poor regeneration effect of high viscosity rich absorbent.

[0006] To achieve the above objectives, this application provides a desorption device, comprising a mounting housing, a blade guide assembly, and a disc assembly. The mounting housing has a mounting cavity containing an injection pipe for introducing the solution to be desorbed. The injection pipe has several injection holes on its peripheral wall. The blade guide assembly is located within the mounting cavity and rotatably fitted over the injection pipe. The disc assembly is located within the mounting cavity and includes a connecting cylinder and a disc group. The connecting cylinder is fitted over the outer side of the blade guide assembly and fixedly connected to it. The connecting cylinder has several first flow holes on its peripheral wall. The disc group is located on the side of the connecting cylinder opposite to the blade guide assembly, and several discs in the disc group are spaced apart and staggered from the first flow holes along the length of the connecting cylinder. The discs in the disc group are arranged in a wavy pattern. The bottom of the mounting housing has a desorption vapor inlet and a solution outlet communicating with the mounting cavity on the outer side of the disc group. The top or side of the mounting housing has a desorption gas outlet communicating with the mounting cavity on the outer side of the disc group.

[0007] In this embodiment of the application, the number of disc assemblies is at least two. The at least two disc assemblies are arranged sequentially from the inside to the outside of the blade guide assembly, and the number of disc bodies in the at least two disc assemblies decreases sequentially from the inside to the outside while the spacing increases sequentially.

[0008] In the embodiments of this application, the corrugation angle of the disc bodies in at least two disc assemblies is set to decrease sequentially from the inside to the outside.

[0009] In the embodiments of this application, at least two disc assemblies have a plurality of second flow holes on their disc bodies, and the second flow holes on two adjacent disc bodies in the same disc assembly are staggered.

[0010] In the embodiments of this application, the diameter of the second flow hole on the disc body of at least two disc assemblies is set to decrease sequentially from the inside to the outside.

[0011] In the embodiments of this application, at least two disc assemblies are configured to include a first disc assembly, a second disc assembly, and a third disc assembly arranged sequentially from the inside out.

[0012] In this embodiment of the application, a heat exchange tube is provided on the connecting cylinder, and the heat exchange tube is used to introduce the heat exchange medium.

[0013] In this embodiment, the mounting cavity includes a first mounting area, a second mounting area, and a flow guiding area arranged sequentially from the inside to the outside. The injection pipe is located in the first mounting area, and the blade flow guiding assembly and the disc assembly are located in the second mounting area. The side wall of the flow guiding area is provided with a flow passage connecting the desorption steam inlet and the flow guiding area. The top wall of the flow guiding area is inclined downward in the direction from the outside to the inside.

[0014] In this embodiment of the application, the mounting housing includes an outer shell and an inner shell. The bottom of the outer shell is provided with a desorption vapor inlet and a solution outlet, and the top or side of the outer shell is provided with a desorption gas outlet. The inner shell is disposed inside the outer shell, and an mounting cavity is formed inside the inner shell. A cavity is formed between the inner shell and the outer shell, and an opening communicating with the cavity is provided on the side of the inner shell.

[0015] In this embodiment of the application, the blade guide assembly includes a turbine blade rotatably sleeved outside the injection pipe, and a drive component for driving the turbine blade to rotate.

[0016] In addition, this application also provides a carbon dioxide capture device, which includes an absorption tower, a phase separator, a liquid mixer, and a desorption device as described above. The phase separator is connected to the bottom of the absorption tower; the liquid mixer is connected to the middle of the phase separator and the top of the absorption tower; the injection pipe of the desorption device is connected to the bottom of the phase separator, and the solution outlet of the desorption device is connected to the liquid mixer.

[0017] In this embodiment of the application, the carbon dioxide capture device further includes a separation device, which is connected to the inlet of the absorption tower and is used to separate dust from the gas.

[0018] Through the above technical solutions, the desorption device provided in this application embodiment has the following beneficial effects:

[0019] In the technical solution of this application, the desorption steam inlet is used to introduce low-pressure steam. The bottom of the mounting housing is provided with a desorption steam inlet on the outside of the disc assembly, which allows the low-pressure steam to come into countercurrent contact with the solution to be desorbed. After the solution to be desorbed is injected from the injection pipe, it flows out from the injection through hole on the injection pipe. The rotating blade guide assembly cuts and disperses the solution to be desorbed into droplets or liquid filaments. Then, the solution to be desorbed enters the flow channel between two adjacent discs through the first flow hole on the connecting cylinder. The discs are wavy, and the rotation of the discs generates centrifugal force, causing the discs to flow outward. The solution to be desorbed comes into countercurrent contact with the low-pressure steam. After the desorption of the solution is completed, the lean absorbent generated flows out from the solution outlet at the bottom of the mounting housing, and carbon dioxide flows out from the desorbed gas outlet and enters the subsequent condensation and compression section.

[0020] The corrugated structure on the disc body in this application can enhance fluid disturbance, increase turbulence, induce secondary flow and vortex flow, improve the overall liquid film renewal rate, reduce the mass transfer resistance of carbon dioxide from the liquid phase (carbonate) to the gas phase, and avoid the problem of local liquid accumulation in the solution to be desorbed. It effectively increases the effective gas-liquid mass transfer area between the high-viscosity solution to be desorbed and the vapor, and improves the regeneration effect of the absorbent.

[0021] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of the desorption device according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the disk assembly in a desorption apparatus according to an embodiment of the present application from one view.

[0025] Figure 3This is a schematic diagram of the disc assembly in a desorption apparatus according to an embodiment of this application from another perspective;

[0026] Figure 4 This is a schematic diagram of the structure of the disc body in a desorption device according to an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of a carbon dioxide capture device according to an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] Detailed Implementation

[0030] The specific embodiments of this application 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 this application.

[0031] The desorption apparatus of this application is described below with reference to the accompanying drawings.

[0032] like Figures 1 to 5 As shown, this application provides a desorption device 100, which includes a mounting housing 10, a blade guide assembly 20, and a disc assembly 30. The mounting housing 10 forms a mounting cavity 13, and an injection pipe 14 for the solution to be desorbed is provided in the mounting cavity 13. A plurality of injection through holes 141 are formed on the peripheral wall of the injection pipe 14. The blade guide assembly 20 is located in the mounting cavity 13 and is rotatably sleeved on the outside of the injection pipe 14. The disc assembly 30 is located in the mounting cavity 13 and includes a connecting cylinder 31 and a disc assembly. The connecting cylinder 31 is sleeved on the outside of the blade guide assembly 20 and fixed to the blade guide assembly 20. The connecting cylinder 31 has several first flow holes 311 on its peripheral wall. The disc group is located on the side of the connecting cylinder 31 away from the blade guide assembly 20. Several disc bodies 32 in the disc group are arranged sequentially and staggered from the first flow holes 311 along the length direction of the connecting cylinder 31. The disc bodies 32 in the disc group are arranged in a wave shape. The bottom of the mounting housing 10 has a desorption vapor inlet 111 and a solution outlet 112 communicating with the mounting cavity 13 on the outside of the disc group. The top or side of the mounting housing 10 has a desorption gas outlet 113 communicating with the mounting cavity 13 on the outside of the disc group.

[0033] The solution to be desorbed is injected through the injection pipe 14, which has several injection through holes 141 on its peripheral wall. The solution to be desorbed flows out from the injection through holes 141, and the blade guide assembly 20 rotates to cut and disperse the solution to be desorbed (i.e., the absorbent-rich solution). The connecting cylinder 31 is sleeved on the outside of the blade guide assembly 20 and is fixedly connected to the blade guide assembly 20. The rotation of the blade guide assembly 20 can drive the connecting cylinder 31 to rotate. A disc group is provided on the side of the connecting cylinder 31 away from the blade guide assembly 20, and the rotation of the connecting cylinder 31 drives the disc group to rotate. Several disc bodies 32 in the disc group are arranged sequentially at intervals along the length of the connecting cylinder 31, and the disc bodies 32 are staggered from the first flow hole 311, with a flow channel formed between two adjacent disc bodies 32. After the desorption solution is dispersed by the blade guide assembly 20, it enters the flow channel between two adjacent disc bodies 32 through the first flow hole 311 on the connecting cylinder 31.

[0034] The desorption steam inlet 111 is used to introduce low-pressure steam. The bottom of the mounting housing 10 is provided with the desorption steam inlet 111 on the outside of the disc assembly, which allows the low-pressure steam to come into countercurrent contact with the solution to be desorbed. After the solution to be desorbed is injected through the injection pipe 14, it flows out through the injection through hole 141 on the injection pipe 14. The rotating blade guide assembly 20 cuts and disperses the solution to be desorbed into droplets or liquid filaments. Then, the solution to be desorbed enters the flow channel between two adjacent disc bodies 32 through the first flow hole 311 on the connecting cylinder 31. The disc body 32 is wavy and the rotation of the disc body 32 generates centrifugal force, causing the disc body 32 to flow outward. The solution to be desorbed comes into countercurrent contact with the low-pressure steam. After the desorption of the solution is completed, the lean absorbent generated flows out from the solution outlet 112 at the bottom of the mounting housing 10, and carbon dioxide flows out from the desorbed gas outlet 113 and enters the subsequent condensation and compression section.

[0035] The corrugated structure on the disc body 32 in this application can enhance fluid disturbance, increase turbulence, induce secondary flow and vortex flow, improve the overall liquid film renewal rate, reduce the mass transfer resistance of carbon dioxide from the liquid phase (carbonate) to the gas phase, and avoid the problem of local liquid accumulation in the solution to be desorbed. It effectively increases the effective gas-liquid mass transfer area between the high-viscosity solution to be desorbed and the vapor, and improves the regeneration effect of the absorbent.

[0036] Specifically, the absorbent uses a composite polyol amine absorbent, including existing commercial absorbents such as the 3H series, iCap series, DMX series, TBS series, DECAB series, BHKL series, and CT8-23 series. Other absorbents that undergo multiphase changes after absorbing CO2 can also be used. The blade guide assembly 20 rotates at a speed of 20-3000 rpm, with a gas-liquid ratio of 20-400, an operating temperature of 70-150 degrees Celsius, and an operating pressure of 0.01-0.5 MPa (absolute pressure).

[0037] In the embodiments of this application, please refer to Figure 2 and Figure 3 The number of disc assemblies 30 is at least two. The at least two disc assemblies 30 are arranged sequentially from the inside to the outside of the blade guide assembly 20, and the number of disc bodies 32 in the at least two disc assemblies 30 decreases sequentially and the spacing increases sequentially from the inside to the outside.

[0038] The velocity of the solution to be desorbed is higher in the area near the blade guide assembly 20. The inner disc assembly 30 has a large number of discs 32 with small spacing. The small spacing can reduce fluid impact resistance and ensure that the fluid enters the flow channel smoothly.

[0039] In the area far from the blade guide assembly 20, the velocity of the solution to be desorbed is lower. The number of discs 32 in the outer disc assembly 30 is smaller and the spacing is larger. The larger spacing can increase the mass transfer density, prolong the liquid residence time, and increase the liquid holding capacity.

[0040] In the embodiments of this application, please refer to Figure 2 and Figure 3 The corrugation angles of the disc bodies 32 in at least two disc assemblies 30 are set to decrease sequentially from the inside to the outside.

[0041] The inner disc 32 has a larger corrugation angle, meaning the corrugations are steeper, which increases liquid turbulence by utilizing the initial liquid flow velocity. The corrugation angle on the middle disc 32 is smaller than that on the inner disc 32, inducing an increase in the liquid spreading area. The corrugation angle on the outer disc 32 is smaller than that on the middle disc 32, with gentler corrugations, allowing the liquid to spread further, reducing obstruction, and increasing the contact area between the solution to be desorbed and the countercurrent low-pressure vapor.

[0042] Based on this, the wave heights of the disc bodies 32 in at least two disc assemblies 30 are arranged to increase sequentially from the inside out. Wave height is the vertical distance from the crest to the trough.

[0043] The inner disc body 32 has a smaller wave height, which reduces fluid impact resistance and promotes fluid entry. The outer disc body 32 has a larger wave height, which prolongs the liquid residence time, allowing the solution to be desorbed to come into full contact with the countercurrent low-pressure vapor.

[0044] In the embodiments of this application, please refer to Figure 4 At least two disc assemblies 30 have a plurality of second flow holes 321 on their disc bodies 32, and the second flow holes 321 on two adjacent disc bodies 32 in the same disc assembly 30 are staggered.

[0045] Each disc body 32 is provided with a number of spaced second flow holes 321. Furthermore, the second flow holes 321 on two adjacent disc bodies 32 within the same disc assembly 30 are staggered, so that the solution to be desorbed on the upper disc body 32 flows out from the second flow holes 321 and is intercepted by the lower disc body 32, causing liquid surface disturbance in the lower disc body 32, thereby increasing the mass transfer area.

[0046] Based on this, the diameter of the second flow hole 321 on the disc body 32 in at least two disc assemblies 30 is set to decrease sequentially from the inside to the outside.

[0047] The inner disc body 32 has a higher flow rate, and the large-diameter second flow orifice 321 is conducive to the formation of a liquid film and the maintenance of radial force, which is beneficial to mass transfer. The outer disc body 32 has a slower flow rate and an increased spreading area, and the small-diameter second flow orifice 321 is conducive to film formation.

[0048] In the embodiments of this application, please refer to Figure 2 and Figure 3 At least two disc assemblies 30 are configured to include a first disc assembly 30a, a second disc assembly 30b, and a third disc assembly 30c arranged sequentially from the inside out.

[0049] Specifically, the first disc assembly 30a is located on the inner side, that is, the side close to the blade guide assembly 20. The fluid velocity of the first disc assembly 30a is high and the centrifugal force is low. The distance between two adjacent disc bodies 32 in the first disc assembly 30a is small, which can be 1mm to 2mm. The diameter of the second flow hole 321 of the disc body 32 on the first disc assembly 30a is large, which can be 2mm to 3mm, to reduce fluid resistance and promote fluid entry.

[0050] The second disc assembly 30b is located in the middle. The fluid on the second disc assembly 30b begins to form a liquid film, and the centrifugal force increases. The distance between two adjacent disc bodies 32 in the second disc assembly 30b is a medium aperture, which can be 2mm to 3mm. The aperture of the second flow hole 321 of the disc body 32 on the second disc assembly 30b is 1mm to 2mm, which increases the surface area and promotes gas-liquid contact.

[0051] The third disc assembly 30c is located on the outer side, that is, on the side away from the blade guide assembly 20. The centrifugal force of the third disc assembly 30c is the greatest, and the liquid tends to flow out quickly. The distance between two adjacent disc bodies 32 in the third disc assembly 30c is relatively large, which can be 3mm to 5mm. The aperture of the second flow hole 321 of the disc body 32 on the third disc assembly 30c is relatively small, which can be 0.5mm to 1mm, to enhance the liquid holding capacity and prolong the liquid residence time.

[0052] In this embodiment, a heat exchange tube (not shown) is provided on the connecting cylinder 31, which is used to introduce a heat exchange medium. When the heat provided by the low-pressure steam is insufficient, a higher-temperature heat exchange medium is introduced into the heat exchange tube to supplement the heat. When the temperature of the low-pressure steam is too high, a lower-temperature heat exchange medium is introduced into the heat exchange tube for cooling. By setting up the heat exchange tube, flexible heat supply and heat removal can be achieved, ensuring that the temperature is within a preset range and improving the regeneration efficiency of the absorbent.

[0053] Specifically, the heat exchange tubes can be embedded inside the connecting cylinder 31 or directly mounted on the surface of the connecting cylinder 31. The disc body 32 can be made of a high thermal conductivity material (such as copper alloy or graphene coating) to enhance heat conduction.

[0054] In addition, the surface of the disc body 32 may be coated with a hydrophilic coating (such as silicon oxide), or the surface roughness of the disc may be increased (such as micron-level etching) to enhance liquid adhesion.

[0055] In the embodiments of this application, please refer to Figure 1 The mounting cavity 13 includes a first mounting area 131, a second mounting area 132, and a guide area 133 arranged sequentially from the inside to the outside. The injection pipe 14 is located in the first mounting area 131, and the blade guide assembly 20 and the disc assembly 30 are located in the second mounting area 132. The side wall of the guide area 133 is provided with a flow channel connecting the desorption steam inlet 111 and the guide area 133. The top wall of the guide area 133 is inclined downward in the direction from the outside to the inside.

[0056] An injection pipe 14 is installed in the first installation area 131, and a blade guide assembly 20 and a disc assembly 30 are installed in the second installation area 132. The side wall of the guide area 133 is provided with a flow channel connecting the desorption steam inlet 111 and the guide area 133. Low-pressure steam enters from the desorption steam inlet 111 and then enters the guide area 133 through the flow channel. The top wall of the guide area 133 is inclined downward in the direction from the outside to the inside, so that the size of the guide area 133 gradually decreases from the outside to the inside, which can guide the low-pressure steam and allow the low-pressure steam to quickly enter the installation cavity 13 and react with the solution to be desorbed.

[0057] In the embodiments of this application, please refer to Figure 1 The mounting housing 10 includes an outer shell 11 and an inner shell 12. The bottom of the outer shell 11 is provided with a desorption vapor inlet 111 and a solution outlet 112. The top or side of the outer shell 11 is provided with a desorption gas outlet 113. The inner shell 12 is disposed inside the outer shell 11. An installation cavity 13 is formed inside the inner shell 12. A cavity 15 is formed between the inner shell 12 and the outer shell 11. An opening communicating with the cavity 15 is provided on the side of the inner shell 12.

[0058] The desorption vapor inlet 111 and solution outlet 112 are located at the bottom of the outer shell 11, and the desorption gas outlet 113 is located at the top or side of the outer shell 11. An inner shell 12 is disposed within the outer shell 11, and an installation cavity 13 is formed within the inner shell 12. A cavity 15 is formed between the inner shell 12 and the outer shell 11, and an opening communicating with the cavity 15 is provided on the side of the inner shell 12. Low-pressure vapor enters the cavity 15 through the desorption vapor inlet 111, then passes through the opening of the inner shell 12, and then enters the installation cavity 13 within the inner shell 12. The desorbed absorbent flows from the opening of the inner shell 12 to the cavity 15, and then flows out from the solution outlet 112. The desorbed carbon dioxide flows from the opening of the inner shell 12 to the cavity 15, and then flows out from the desorption gas outlet 113.

[0059] It is understandable that the carbon dioxide flowing out of the desorbed gas outlet 113 will contain vapor. A cooling separator can be installed to condense the water. The flow channel connecting the desorbed vapor inlet 111 and the guide zone 133 is the cavity 15 between the inner shell 12 and the outer shell 11. The desorbed vapor inlet 111 is at a relatively high height, above the surface of the lean absorbent liquid, to prevent the lean absorbent from clogging the desorbed vapor inlet 111.

[0060] In the embodiments of this application, please refer to Figure 1 and Figure 2 The blade guide assembly 20 includes a turbine blade 21 rotatably mounted outside the injection pipe 14, and a drive member 22 for driving the turbine blade 21 to rotate.

[0061] The turbine blade 21 features a smooth inner edge and a sharp outer edge design to optimize the radial acceleration of the fluid. The drive unit 22 is used to drive the turbine blade 21 to rotate, so that the turbine blade 21 can cut and break up the solution to be desorbed.

[0062] Specifically, the drive end of the drive component 22 can be connected to the inner housing 12, and the drive component 22 drives the inner housing 12 to rotate, causing the turbine blades 21 and the disc assembly 30 inside the inner housing 12 to rotate. Alternatively, the drive end of the drive component 22 can be connected to the turbine blades 21, and the drive component 22 drives the turbine blades 21 to rotate, which in turn drives the disc assembly 30 to rotate, while the inner housing 12 does not rotate. In this case, the drive end of the drive component 22 is sealed to the inner housing 12 to prevent leakage of the solution to be desorbed.

[0063] In addition, this application also provides a carbon dioxide capture device, please refer to [link to relevant documentation]. Figure 5The carbon dioxide capture device includes an absorption tower 200, a phase separator 300, a liquid mixer 400, and a desorption device 100 as described above. Since the carbon dioxide capture device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] The phase separator 300 is connected to the bottom of the absorption tower 200; the liquid mixer 400 is connected to the middle of the phase separator 300 and the top of the absorption tower 200; the injection pipe 14 of the desorption device 100 is connected to the bottom of the phase separator 300 and the solution outlet 112 of the desorption device 100 is connected to the liquid mixer 400.

[0065] After the exhaust gas is conveyed to the absorption tower 200, it comes into countercurrent contact with the lean absorbent introduced at the top of the absorption tower 200 to achieve efficient separation of carbon dioxide. After absorption, the exhaust gas is discharged into the atmosphere from the top of the absorption tower 200. The rich absorbent (the solution to be desorbed) enters the phase separator 300 from the bottom of the absorption tower 200. The phase separator 300 is a device for separating gas-liquid and liquid-liquid phases. The phase separator 300 separates the rich absorbent into light and heavy phases. The light phase absorbent is collected from the middle of the phase separator 300 and sent to the liquid mixer 400, while the heavy phase rich absorbent is collected from the bottom of the phase separator 300 and sent to the desorption unit 100 for desorption regeneration. The desorbed and regenerated lean absorbent is sent to the liquid mixer 400, and after thorough mixing, the lean absorbent is sent to the top of the absorption tower 200.

[0066] Specifically, the absorber 200 is any one of a bulk packed tower, a structured packed tower, or a segmented packed tower. In a preferred embodiment, it is a structured packed tower. The absorbent inlet temperature at the top of the absorber 200 is 40-50 degrees Celsius, and the pressure of the absorber 200 is 0.02-0.5 MPa (gauge pressure). The phase separator 300 includes, but is not limited to, flash tanks, extraction separators, etc., and may also contain a two-phase separation device 500 with internal components or internal moving parts, such as a device based on the principle of centrifugal force, with an operating temperature of 40-50 degrees Celsius. The liquid mixer 400 is a device for mixing liquids of different viscosities and densities, including but not limited to devices based on the principle of centrifugal force, static mixers, and other efficient process enhancement methods for thorough mixing. The mixing time is 0.1-500 seconds, and the mixing temperature is 40-60 degrees Celsius.

[0067] In the embodiments of this application, please refer to Figure 5 The carbon dioxide capture equipment also includes a separation device 500, which is connected to the inlet of the absorption tower 200 and is used to separate dust from the gas. By setting up the separation device 500 to separate dust from the gas, dust adsorption on the surface of the absorbent and pollution are avoided, and dust interference with the phase separation process is prevented.

[0068] Specifically, the separation device 500 includes a first separator 501 and a second separator 502 arranged sequentially. The first separator 501 is a device that can separate particulate matter using an electric field, gravitational field, etc., and is used to separate dust from gas. In a preferred embodiment, the first separator 501 is an electrostatic precipitator. In other optional embodiments, the first separator 501 can be a cyclone separator or a device based on a similar principle.

[0069] The second separator 502 is a device that can separate NOx (nitrides) and SOx (sulfides) by means of gas-liquid countercurrent contact. In a preferred embodiment, it is a spray tower. In other optional embodiments, the second separator 502 can be any of a sieve plate tower, a bubble tower, or a packed tower.

[0070] The steps for using the carbon dioxide capture device in this application are as follows:

[0071] S1: The exhaust gas is sequentially introduced into the first separator 501 and the second separator 502 for pretreatment to separate dust, NOx and SOx.

[0072] S2: The pretreated exhaust gas is transported to the bottom of the absorption tower 200, where it comes into staged countercurrent contact with the lean absorbent introduced at the top of the absorption tower 200 to complete the efficient separation of carbon dioxide. After absorption, the exhaust gas is discharged into the atmosphere from the top of the absorption tower 200.

[0073] S3: The rich absorbent is introduced into the phase separator 300 from the bottom of the absorption tower 200, and the phases are separated into light and heavy phases. The light phase absorbent is taken out from the middle of the phase separator 300 and sent to the liquid mixer 400, and the heavy phase rich absorbent is taken out from the bottom of the phase separator 300 and sent to the desorption device 100 for desorption and regeneration.

[0074] S4: The lean absorbent is introduced from the desorption device 100 into the liquid mixer 400, and after being fully mixed, the lean absorbent is introduced into the top of the absorption tower 200.

[0075] S5: The high-concentration carbon dioxide at the desorption gas outlet 113 of the desorption device 100 is introduced into the subsequent condensation and compression section.

[0076] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A desorption apparatus, characterized by, The desorption device includes: The mounting housing (10) has a mounting cavity (13) and an injection tube (14) for the solution to be desorbed to be introduced into the mounting cavity (13). The peripheral wall of the injection tube (14) has several injection through holes (141). The blade guide assembly (20) is located inside the mounting cavity (13) and rotatably sleeved outside the injection pipe (14); The disc assembly (30) is located in the mounting cavity (13) and includes a connecting cylinder (31) and a disc group. The connecting cylinder (31) is sleeved on the outside of the blade guide assembly (20) and fixedly connected to the blade guide assembly (20). A plurality of first flow holes (311) are provided on the peripheral wall of the connecting cylinder (31). The disc group is located on the side of the connecting cylinder (31) away from the blade guide assembly (20). A plurality of disc bodies (32) in the disc group are arranged sequentially at intervals and staggered from the first flow holes (311) along the length direction of the connecting cylinder (31). The plurality of disc bodies (32) in the disc group are arranged in a wave shape. The bottom of the mounting housing (10) is provided with a desorption vapor inlet (111) and a solution outlet (112) communicating with the mounting cavity (13) on the outside of the disc group. The top or side of the mounting housing (10) is provided with a desorption gas outlet (113) communicating with the mounting cavity (13) on the outside of the disc group.

2. The desorption device according to claim 1, characterized in that, The number of disc assemblies (30) is at least two. The at least two disc assemblies (30) are arranged sequentially from the inside to the outside of the blade guide assembly (20), and the number of disc bodies (32) in the at least two disc assemblies (30) decreases sequentially and the spacing increases sequentially from the inside to the outside.

3. The desorption device according to claim 2, characterized in that, The corrugation angles of the disc bodies (32) in at least two of the disc assemblies (30) are arranged to decrease sequentially from the inside to the outside.

4. The desorption device according to claim 2, characterized in that, At least two of the disc assemblies (30) have a plurality of second flow holes (321) on their disc bodies (32), and the second flow holes (321) on two adjacent disc bodies (32) in the same disc assembly (30) are staggered.

5. The desorption apparatus according to claim 4, characterized in that, The diameter of the second flow hole (321) on the disc body (32) of at least two of the disc assemblies (30) is arranged to decrease sequentially from the inside to the outside.

6. The desorption apparatus according to claim 2, characterized in that, At least two of the disc assemblies (30) are configured to include a first disc assembly (30a), a second disc assembly (30b), and a third disc assembly (30c) arranged sequentially from the inside out.

7. The desorption apparatus according to any one of claims 1 to 6, characterized in that, A heat exchange tube is provided on the connecting cylinder (31), and the heat exchange tube is used to introduce the heat exchange medium.

8. The desorption apparatus according to any one of claims 1 to 6, characterized in that, The mounting cavity (13) includes a first mounting area (131), a second mounting area (132), and a guide area (133) arranged sequentially from the inside to the outside. The injection pipe (14) is located in the first mounting area (131). The blade guide assembly (20) and the disc assembly (30) are located in the second mounting area (132). The side wall of the guide area (133) is provided with a flow channel connecting the desorption steam inlet (111) and the guide area (133). The top wall of the guide area (133) is inclined downward in the direction from the outside to the inside.

9. The desorption apparatus according to any one of claims 1 to 6, characterized in that, The mounting housing (10) includes an outer shell (11) and an inner shell (12). The bottom of the outer shell (11) is provided with the desorption vapor inlet (111) and the solution outlet (112). The top or side of the outer shell (11) is provided with the desorption gas outlet (113). The inner shell (12) is disposed inside the outer shell (11). The mounting cavity (13) is formed inside the inner shell (12). A cavity (15) is formed between the inner shell (12) and the outer shell (11). An opening communicating with the cavity (15) is opened on the side of the inner shell (12).

10. The desorption apparatus according to any one of claims 1 to 6, characterized in that, The blade guide assembly (20) includes a turbine blade (21) rotatably fitted outside the injection pipe (14) and a drive member (22) for driving the turbine blade (21) to rotate.

11. A carbon dioxide capture device, characterized in that, The carbon dioxide capture device includes: Absorption tower (200); Phase separator (300), which is connected to the bottom of the absorption tower (200); A liquid mixer (400) connected to the middle of the phase separator (300) and connected to the top of the absorption tower (200); and, According to any one of claims 1 to 10, the injection tube (14) of the desorption device (100) is connected to the bottom of the phase separator (300), and the solution outlet (112) of the desorption device (100) is connected to the liquid mixer (400).

12. The carbon dioxide capture device according to claim 11, characterized in that, The carbon dioxide capture device further includes a separation device (500), which is connected to the inlet of the absorption tower (200) and is used to separate dust from the gas.

Images