A moving bed solid adsorption CO2 capture system

Abstract

The present invention relates to a moving bed solid adsorption CO2 capture system, comprising an adsorption reactor, a desorption reactor, a circulation transport mechanism and a storage subsystem; the adsorption reactor has a smoke inlet, an air outlet, an adsorption feed port and an adsorption discharge port connected to an adsorption cavity therein, the air outlet is located above the smoke inlet, and the adsorption feed port is located above the adsorption discharge port; the desorption reactor has a CO2 outlet, a desorption feed port and a desorption discharge port connected to an inner desorption cavity therein, the desorption feed port is located above the desorption discharge port; the adsorption discharge port is connected to the desorption feed port, and the adsorption discharge port is located above the desorption feed port; the lower feed end of the circulation transport mechanism is located at the desorption discharge port, and the upper discharge end is located at the adsorption feed port; the CO2 outlet is connected to the storage subsystem. The system can reduce the extrusion wear between solid adsorption / desorption particles during use and increase the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of gas adsorption and separation, and in particular to a moving bed solid adsorption CO2 capture system. Background Art

[0002] Post-combustion CO2 capture technology does not affect the original industrial production operation and is flexible and adjustable in scale, so it can be widely used in the capture of flue gas CO2 in thermal power, cement, steel, etc. At present, the more mature post-combustion CO2 capture mainly includes organic amine solution absorption and solid pressure swing adsorption (PSA) technology, but the application of existing technologies still has certain limitations and high energy consumption. Non-amine-based solid adsorption material CO2 capture technology has the characteristics of strong adaptability, no corrosion, and no secondary pollution. It is suitable for large-scale CO2 capture and has great potential for commercial application.

[0003] Solid adsorption CO2 capture technology is an emerging and more promising carbon dioxide capture technology. This technology adsorbs CO2 by allowing flue gas to interact with solid adsorbents in a carbonation reactor. The solid adsorbent after adsorbing CO2 can decompose CO2 in the regeneration reactor by lowering the pressure or increasing the temperature. The solid adsorbent after the decomposition reaction is transported to the carbonation reactor to enter the next carbonation / regeneration reaction cycle. Through the reversible carbonation / regeneration reaction between the solid adsorbent and CO2, the solid adsorbent continuously captures CO2 from the flue gas.

[0004] However, the existing high-temperature solid adsorption CO2 capture technology requires the solid material to be circulated between the carbonation reactor and the regeneration reactor through external facilities (such as gas transportation). The solid material will be converted back and forth between adsorption and desorption. However, during the circulation of the solid material, there is relative movement between the particles, which can easily cause extrusion and wear between the adsorption / desorption particles, resulting in a high elution rate of the adsorption material. A moving bed solid adsorption CO2 capture system is now proposed to solve the above problems. Summary of the invention

[0005] The present invention provides a moving bed solid adsorption CO2 capture system, which can reduce the extrusion and wear between solid adsorption / desorption particles during use, increase the service life, and the desorption efficiency of the flue gas in the entire circulation system is higher, and the CO2 capture efficiency is higher.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A moving bed solid adsorption CO2 capture system, comprising an adsorption reactor, a desorption reactor, a circulation transport mechanism and a storage subsystem;

[0008] The adsorption reactor has a smoke inlet, an air outlet, an adsorption feed inlet and an adsorption discharge port connected to the adsorption cavity therein, the air outlet is located above the smoke inlet, and the adsorption feed inlet is located above the adsorption discharge port, so that the solid material at the adsorption feed inlet falls to the adsorption discharge port along the adsorption cavity in the adsorption reactor under the action of gravity;

[0009] The desorption reactor has a CO2 outlet, a desorption feed port and a desorption discharge port connected to the desorption cavity therein, and the desorption feed port is located above the desorption discharge port, so that the solid material at the desorption feed port falls to the desorption discharge port along the desorption cavity in the desorption reactor under the action of gravity;

[0010] The adsorption outlet is connected to the desorption feed port, and the adsorption outlet is located above the desorption feed port, so that the adsorption chamber of the adsorption reactor is connected to the desorption chamber of the desorption reactor;

[0011] The lower feeding end of the above-mentioned circulation transport mechanism is located at the above-mentioned desorption discharge port, and the upper discharging end is located at the above-mentioned adsorption feeding port, so as to transport the solid material desorbed in the above-mentioned desorption reactor to the above-mentioned adsorption reactor;

[0012] The CO2 outlet is communicated with the storage subsystem.

[0013] Preferably, the above-mentioned desorption reactor comprises a sealing section, a desorption section and a cooling section which are sequentially connected from top to bottom;

[0014] The desorption feed port is located at the upper end of the sealing section, the CO2 outlet is arranged on the desorption section, and the desorption discharge port is located at the lower end of the cooling section.

[0015] Preferably, the sealing section comprises a first insulation layer and a sealed inner tube, the first insulation layer is sleeved on the outer side of the sealed inner tube, and the desorption feed port is located on the upper end surface of the sealed inner tube;

[0016] The desorption section comprises a heating layer, a second heat-insulating layer and a desorption inner tube which are sequentially sleeved from the outside to the inside, and the CO2 outlet is located on the desorption inner tube and is connected to the storage subsystem;

[0017] The cooling section comprises a third thermal insulation layer, a cooling layer and a cooling inner tube which are sequentially sleeved from outside to inside, the desorption outlet is located at the lower end surface of the cooling inner tube, the cooling layer has a cooling cavity, and the cooling cavity is connected to a cooling subsystem;

[0018] The sealing inner tube, the desorption inner tube and the cooling inner tube are connected in sequence from top to bottom.

[0019] Preferably, a smoke escape port is provided on the sealed inner tube, and the smoke escape port is connected to the smoke inlet port.

[0020] Preferably, the cooling subsystem comprises a condensate circulation pipeline of the boiler, and the cooling layer comprises a water inlet and a water outlet, and both the water inlet and the water outlet are connected to the condensate circulation pipeline.

[0021] Preferably, it also includes a connecting pipe;

[0022] The above-mentioned adsorption outlet is located at the lower end surface of the above-mentioned adsorption reactor, and the above-mentioned desorption feed port is located at the upper end surface of the above-mentioned desorption reactor. The upper and lower ends of the above-mentioned connecting pipe are respectively detachably connected or integrally connected to the lower part of the above-mentioned adsorption reactor and the upper part of the above-mentioned desorption reactor, so that the above-mentioned desorption feed port is connected with the above-mentioned adsorption outlet.

[0023] Preferably, the circulation transport mechanism comprises an installation box, a reciprocating mechanism and a cooling assembly, wherein the reciprocating mechanism is arranged in the installation box and is arranged obliquely upward;

[0024] A heat insulation board is arranged in the installation box, and the heat insulation board divides the installation box into a transport cavity and a cooling cavity. The cooling assembly is used to supply coldness to the cooling cavity.

[0025] The transport member in the reciprocating mechanism moves from the feed end to the discharge end in the transport cavity, and moves from the feed and discharge end to the feed end in the cooling cavity;

[0026] The above-mentioned desorption discharge port is connected with a discharge pipe, and the discharge port of the above-mentioned discharge pipe passes downward through the above-mentioned installation box and is located in the above-mentioned transportation cavity, and is located above the lower feeding end of the above-mentioned reciprocating mechanism;

[0027] The adsorption feed port is connected to a feed pipe, the feed port of the feed pipe passes through the outer wall of the installation box, the cooling cavity and the insulation board in sequence and is located in the transport cavity, and is located below the outer side of the upper feed end of the reciprocating mechanism.

[0028] Preferably, the cooling assembly includes an inlet pipe, an outlet pipe and a driving pump, and the upper and lower parts of the cooling chamber are respectively provided with an inlet and an outlet, one end of the inlet pipe is connected to the outlet of the driving pump, and one end is connected to the inlet, one end of the outlet pipe is connected to the outlet, and the other end is connected to the outside.

[0029] Preferably, it also includes a heat exchange system;

[0030] The cold end flue gas inlet of the above-mentioned heat exchange system is connected with a smoke inlet pipe, the hot end flue gas outlet is connected with the smoke inlet, the hot end air inlet of the above-mentioned heat exchange system is connected with the above-mentioned CO2 outlet, and the cold end air outlet is connected with the above-mentioned storage subsystem;

[0031] The gas outlet is communicated with the boiler economizer inlet.

[0032] Preferably, the central axis of the adsorption chamber in the adsorption reactor and the central axis of the reaction chamber in the desorption reactor are both at an angle of 25-60° to the horizontal plane.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The setting and connection method of the adsorption reactor and the desorption reactor enable the solid material to fall from the adsorption outlet to the desorption outlet under the action of gravity. Due to the action of gravity, it is difficult for the particles to move relative to each other and they basically fall synchronously, so it is difficult for the particles to wear each other due to movement. This greatly reduces the wear of the solid particles when they are transported from the adsorption feed port of the adsorption reactor to the desorption outlet of the desorption reactor, thereby increasing the service life of the solid particles.

[0035] 2. By directly connecting the adsorption outlet and the desorption feed port, the solid particles at the adsorption outlet can fall to the desorption feed port and enter the desorption chamber only by gravity, which saves a set of transportation mechanisms and makes the whole system simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the overall system of an embodiment of the present invention;

[0038] Figure 2 A cross-sectional view of an adsorption reactor according to an embodiment of the present invention;

[0039] Figure 3 A cross-sectional view of a sealing section of an embodiment of the present invention;

[0040] Figure 4 A cross-sectional view of a desorption section of an embodiment of the present invention;

[0041] Figure 5 It is a cross-sectional view of a cooling section of an embodiment of the present invention;

[0042] Figure 6 It is a schematic diagram of a circulating transport mechanism according to an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Adsorption reactor; 11. Adsorption inner tube; 12. Fourth insulation layer; 13. Smoke inlet; 14. Gas outlet; 15. Adsorption feed inlet; 16. Adsorption outlet; 17. Feed pipe; 2. Desorption reactor; 21. Sealing section; 211. Sealing inner tube; 212. First insulation layer; 213. Smoke escape outlet; 214. Desorption feed inlet; 22. Desorption section; 221. Heating layer; 222. Second insulation layer; 223. Desorption inner tube; 224. CO2 outlet; 23. Cooling section ; 231. The third insulation layer; 232. The cooling layer; 233. The cooling inner tube; 234. The desorption outlet; 235. The outlet pipe; 3. The circulating transport mechanism; 31. The installation box; 311. The transport cavity; 312. The cooling cavity; 32. The reciprocating mechanism; 33. The cooling assembly; 331. The driving pump; 332. The inlet pipe; 333. The outlet pipe; 34. The insulation board; 4. The storage subsystem; 41. The compressor; 42. The storage tank; 5. The condensate circulation pipeline; 6. The connecting pipe; 7. The heat exchange system. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] like Figure 1As shown, an embodiment of the present invention provides a moving bed solid adsorption CO2 capture system, including an adsorption reactor 1, a desorption reactor 2, a circulation transport mechanism 3 and a storage subsystem 4. Through the cooperation of the adsorption reactor 1, the desorption reactor 2, the circulation transport mechanism 3 and the storage subsystem 4, the capture of CO2 in the flue gas is completed.

[0049] Specifically, the adsorption reactor 1 is used to adsorb CO2 in the flue gas, wherein the adsorption reactor 1 has an adsorption chamber, and the adsorption reactor 1 has a smoke inlet 13, an adsorption feed inlet 15, an air outlet 14 and an adsorption outlet 16 connected to the adsorption chamber, the smoke inlet 13 is used to introduce external smoke, the air outlet 14 is used to discharge the adsorbed smoke (mainly composed of N2 and O2), the adsorption feed inlet 15 is used to add solid materials for adsorbing CO2 in the flue gas, and the adsorption outlet 16 is used to discharge the solid materials. Specifically, the air outlet 14 is located above the smoke inlet 13, so that the smoke enters the adsorption chamber from the smoke inlet 13. After entering, it will move upward along the adsorption chamber until it moves to the gas outlet 14, and the adsorption feed port 15 is located above the adsorption discharge port 16. The solid material in the adsorption chamber will fall from the adsorption feed port 15 to the adsorption discharge port 16 under the action of gravity, so that it will come into contact with the flue gas moving upward, thereby adsorbing the flue gas. The solid adsorption material will form a solid desorption material, and in the process of the solid material falling, because it is through gravity, it is difficult for the particles to move relative to each other, and they basically fall synchronously. It is difficult for the particles to have movement wear, which reduces the wear of the solid material during transportation in the adsorption chamber. In this embodiment, the adsorption reactor 1 can be set to tilt upward, and correspondingly, the central axis of the adsorption chamber is also set to tilt upward. It should be noted that the solid material in the adsorption chamber is an adsorption material that can adsorb CO2. After adsorbing CO2, it will become a desorption material.

[0050] Specifically, the desorption reactor 2 is used to desorb CO2 from the solid material that has adsorbed CO2, wherein the desorption reactor 2 has a desorption chamber, the desorption reactor 2 has a CO2 outlet 224, a desorption feed port 214 and a desorption outlet 234 connected to the desorption chamber, and the desorption feed port 214 is located above the desorption outlet 234, and the solid material in the desorption chamber will fall from the desorption feed port 214 to the desorption outlet 234 under the action of gravity, desorbing CO2 while falling, wherein the solid desorption material will form a solid adsorption material, and in the process of the solid material falling, since it is through gravity, it is difficult for the particles to move relative to each other, and they basically fall synchronously, and it is difficult for the particles to have movement wear, thereby reducing the wear of the solid material during transportation in the adsorption chamber. In this embodiment, the desorption reactor 2 can be set obliquely upward, and correspondingly, the central axis of the adsorption chamber is also set obliquely upward.

[0051] In order to make the solid materials in the adsorption chamber and the desorption chamber circulate, the adsorption discharge port 16 is connected with the desorption feed port 214, and the adsorption discharge port 16 is located above the desorption feed port 214, so that the inner adsorption chamber of the adsorption reactor 1 is connected with the inner desorption chamber of the desorption reactor 2, and the lower feed end of the circulation transport mechanism 3 is located at the desorption discharge port 234, and the upper discharge end is located at the adsorption feed port 15, so that the circulation transport mechanism 3 can transport the solid materials desorbed in the desorption reactor 2 to the adsorption reactor 1, thereby forming the transportation of solid materials in the whole system.

[0052] The arrangement and connection of the adsorption reactor 1 and the desorption reactor 2 in the system enable the solid material to fall from the adsorption outlet 16 to the desorption outlet 234 under the action of gravity, wherein the solid adsorption material in the adsorption chamber adsorbs while falling to form a solid desorption material, and the solid desorption material in the desorption chamber desorbs while falling to form a solid adsorption material. During the entire falling process of the solid material, it is difficult for the particles to move relative to each other because they fall synchronously under the action of gravity, so it is difficult for the particles to wear each other, which greatly reduces the wear of the solid particles when they are transported from the adsorption feed port 15 at the adsorption reactor 1 to the desorption outlet 234 at the desorption reactor 2, thereby increasing the service life of the solid particles. Moreover, by directly connecting the adsorption outlet 16 with the desorption feed port 214, the solid particles at the adsorption outlet 16 can fall to the desorption feed port 214 and enter the desorption chamber only by gravity, thereby saving a set of transportation mechanisms and making the entire system simpler.

[0053] It can be known that the solid adsorption particles in the adsorption chamber adsorb CO2 to become solid desorption particles, and the solid desorption particles in the desorption chamber desorb CO2 to become solid adsorption particles. Therefore, in the transportation process of solid particles in the entire system, both the solid particles in the adsorption chamber and the solid particles in the desorption chamber are a mixture of solid adsorption particles and solid desorption particles. In this embodiment, the solid adsorption particles are CaO and the solid desorption particles are CaCO3.

[0054] like Figure 2As shown, the adsorption reactor 1 includes an adsorption inner tube 11 and a fourth insulation layer 12, the fourth insulation layer 12 is sleeved on the outside of the adsorption inner tube 11, the adsorption chamber is located in the adsorption inner tube 11, and the smoke inlet 13, the adsorption feed inlet 15, the gas outlet 14 and the adsorption outlet 16 are all opened on the adsorption inner tube 11, and the smoke inlet 13 is located on the outer wall of the lower end of the adsorption inner tube 11, the gas outlet 14 is located on the upper end surface, the adsorption feed inlet 15 is located on the outer wall of the upper part of the adsorption inner tube 11, and the adsorption outlet 16 is located on the lower end surface of the adsorption inner tube 11, so that the smoke enters the adsorption chamber in the adsorption inner tube 11 from the smoke inlet 13 and is discharged upward from the gas outlet 14, while the solid particles enter from the adsorption feed inlet 15 and then are discharged downward from the adsorption outlet 16 along the inner wall of the adsorption chamber, so that the smoke and the solid particles flow in opposite directions and contact each other, and the solid particles adsorb the smoke. In this embodiment, the adsorption inner tube 11 adopts a metal round tube structure.

[0055] Since the desorption reactor 2 needs to be calcined to heat up the solid particles inside the reactor so as to desorb carbon dioxide, the calcined solid materials need to be cooled down, otherwise the equipment for transporting solid particles will be damaged. However, the existing reactors are calcined as a whole, desorbed, and then cooled down after desorption, which increases the time the whole solid material is in the reactor, thereby reducing the capture efficiency of the system. In this embodiment, the desorption reactor 2 includes a sealing section 21, a desorption section 22 and a cooling section 23, and the sealing section 21, the desorption section 22 and the cooling section 23 are connected in sequence from top to bottom; wherein the sealing section 21 is a transition section, and the desorption feed port 214 is located at the upper end of the sealing section 21, which is used to receive solid particles from the adsorption reactor 1, and is used to flow solid particles to prepare for entering the desorption section 22; the desorption section 22 is the core section of the desorption reactor 2, which plays the role of desorbing carbon dioxide in the solid particles, and CO2 The outlet 224 is arranged on the desorption section 22, so that CO2 enters the storage subsystem 4 from the CO2 outlet 224 and is stored; the cooling section 23 serves to cool the solid particles coming out of the desorption section 22, and the desorption outlet 234 is located at the lower end of the cooling section 23. The solid particles after cooling can fall to the feed port of the circulating transport mechanism 3 through the desorption outlet 234 and be transported, thereby preventing the solid particle materials with higher temperature from falling onto the circulating transport mechanism 3, thereby causing damage to the transport parts of the circulating transport mechanism 3. In summary, by setting up the continuous sealing section 21, the desorption section 22 and the cooling section 23, the desorption reactor 2 can simultaneously perform transition preparation, CO2 desorption and cooling of the solid particles while the granular material continuously falls under the action of gravity. It is just the solid particles in different positions, but they are carried out at the same time, so there is no need to increase the cooling time separately, so the residence time of the solid particles in the desorption reactor 2 is greatly reduced, thereby accelerating the circulation rate of the solid particles in the whole system to a certain extent and accelerating the CO2 capture efficiency in the flue gas.

[0056] Specifically, Figure 3As shown, the sealing section 21 includes a first insulation layer 212 and a sealing inner tube 211. The first insulation layer 212 is sleeved on the outer side of the sealing inner tube 211. The desorption feed port 214 is located on the upper end face of the sealing inner tube 211. The sealing inner tube 211 is used to circulate solid particles (about 600°C) discharged from the adsorption chamber. The first insulation layer 212 is used to keep the temperature of the solid particles warm, thereby avoiding the temperature loss of the solid particles, which causes the subsequent desorption section 22 to need to increase the temperature more. In addition, a flue gas escape port 213 is provided on the sealing inner tube 211. The flue gas escape port 213 is connected to an escape pipe, so that the escaping flue gas in the sealed inner tube 211 can flow out from the flue gas escape port 213, which can avoid entering the desorption inner tube 223 to a certain extent, so that the CO2 flowing out from the CO2 outlet 224 is impure. As shown Figure 4 As shown, the desorption section 22 includes a heating layer 221, a second insulation layer 222 and a desorption inner tube 223 which are sequentially sleeved from the outside to the inside, wherein the desorption inner tube 223 is connected to the sealed inner tube 211 for circulating solid particles, the second insulation layer 222 is used to keep the temperature of the desorption inner tube 223 warm, the heating layer 221 is used to heat so that the temperature of the solid particles in the desorption inner tube 223 increases, so that the solid particles (desorption materials) that have absorbed CO2 in the adsorption chamber desorb CO2, and the CO2 outlet 224 is located on the desorption inner tube 223 and is connected to a gas supply pipe, and the desorbed CO2 is supplied to the storage subsystem 4 through the gas supply pipe for storage; wherein the heating layer 221 can be an electromagnetic coil layer, which is energized to heat the solid particles in the desorption inner tube 223 to reach the desorption temperature, which is 900-950°C. Figure 5 As shown, the cooling section 23 includes a third insulation layer 231, a cooling layer 232 and a cooling inner tube 233 which are sequentially sleeved from the outside to the inside. The cooling inner tube 233 is connected to the desorption inner tube 223. The cooling layer 232 has a cooling cavity. The cooling cavity is connected to a cooling subsystem. The cold source is supplied to the cooling cavity through the cooling subsystem, and heat is exchanged with the solid particles discharged from the desorption inner tube 223 in the cooling inner tube 233, thereby reducing the temperature of the solid particles and cooling the solid particles to 400-500°C. Moreover, the desorption outlet 234 is located at the lower end surface of the cooling inner tube 233, and then the solid particles with reduced temperature fall from the desorption outlet 234 to the feed end of the circulation transport mechanism 3 for transportation. In this embodiment, the sealing inner tube 211, the desorption inner tube 223 and the cooling inner tube 233 are sequentially connected and integrally formed into the desorption inner tube 223, and the desorption inner tube 223 can be a metal round tube structure. The cooling layer 232 can also be a metal round tube.

[0057] Specifically, the cooling subsystem includes a condensate circulation pipe 5 of the boiler, and the cooling layer 232 includes a water inlet and a water outlet, both of which are connected to the condensate circulation pipe 5. Specifically, the inlet is connected to the condensate circulation pipe 5 at the outlet of the condenser, and the outlet is connected to the condensate circulation pipe 5 at the inlet of the high-temperature heater. The temperature of the condensate after heat exchange with the solid particles in the cooling chamber is 600-800°C, and then it is supplied to the high-temperature heater, so that the excess heat of the solid particles is supplied to the condensate of the boiler, thereby reducing the supply of high-temperature steam from the high-pressure cylinder in the unit to the high-temperature heater, reducing steam consumption, and increasing the power generation efficiency of the unit.

[0058] In order to ensure that the adsorption outlet 16 and the desorption feed port 214 are stably connected together, in the present embodiment, a connecting pipe 6 is provided between the desorption reactor 2 and the desorption reactor 2, and the two ends of the connecting pipe 6 can be detachably connected to the lower end surface of the adsorption reactor 1 and the upper end surface of the desorption reactor 2 respectively or can be integrally connected, so that the desorption feed port 214 is connected to the adsorption outlet 16, and the detachable connection can be a threaded connection.

[0059] Specifically, Figure 6As shown, the circulating transport mechanism 3 includes an installation box 31, a reciprocating mechanism 32 and a cooling component 33. The reciprocating mechanism 32 is arranged in the installation box 31 and is inclined upward. It can be known that the adsorption reactor 1 and the desorption reactor 2 are not in the same plane and are staggered. An insulation board 34 is arranged in the installation box 31, and the insulation board 34 divides the installation box 31 into a transport chamber 311 and a cooling chamber 312. The cooling component 33 is used to supply cold energy to the cooling chamber 312. When the reciprocating mechanism 32 is working, the transport parts in the reciprocating mechanism 32 move from the feed end to the discharge end in the transport chamber 311, and transport solid particles discharged from the desorption discharge port 234 and having a certain temperature. In the cooling chamber 312, the transport parts move from the feed and discharge ends to the feed end, and the transport parts are in contact with the cold energy, thereby reducing their own temperature, thereby avoiding damage to the transport parts due to continuous heat exchange with the solid particles in the transport chamber 311. Specifically, the desorption outlet 234 is connected to a discharge pipe 235, the discharge port of the discharge pipe 235 passes downward through the installation box 31 and is located in the transport cavity 311, and is located above the lower feed end of the reciprocating mechanism 32; the adsorption feed port 15 is connected to a feed pipe 17, the feed port of the feed pipe 17 passes upward through the outer wall of the installation box 31, the cooling cavity 312 and the insulation board 34 in sequence and is located in the transport cavity 311, and is located below the outer side of the upper feed end of the reciprocating mechanism 32; when in use, the solid particles discharged from the desorption outlet 234 will fall onto the transport member at the feed end of the reciprocating mechanism 32 through the discharge pipe 235, and then be transported by the reciprocating mechanism 32 to the upper discharge end, and then fall into the adsorption feed port 15 through the feed pipe 17, so that the solid particles enter the adsorption cavity. Specifically, the flow rate of the solid particles at the desorption outlet 234 is controlled by the valve on the discharge pipe 235. Specifically, the reciprocating mechanism 32 can be a conveyor belt mechanism, but the conveyor belt in the conveyor belt mechanism is made of metal. As shown in the figure, the driving wheel of the conveyor belt mechanism is partially located in the transport cavity 311, and partially passes through the mounting hole set on the heat insulation board 34 and is located in the cooling cavity 312. It should be noted that the driving wheel and the mounting hole can be sealed or not, but the gap between the two needs to be very small. Similarly, the conveyor belt and the mounting hole can be sealed or not, but the gap between the two needs to be very small to ensure that the cold source in the cooling cavity 312 can fully act in the cooling cavity 312. Although the above-mentioned feed pipe 17 enters and passes through the cooling cavity 312, in order to further ensure the temperature of the solid particles in the feed pipe 17, a fifth insulation layer can be provided on the outside of the feed pipe 17. The above-mentioned insulation layers are all made of existing insulation materials.

[0060] Specifically, the cooling assembly 33 includes an inlet pipe 332, an outlet pipe 333 and a driving pump 331. The upper and lower parts of the cooling chamber 312 are respectively provided with an inlet and an outlet. One end of the inlet pipe 332 is connected to the outlet of the driving pump 331 and the other end is connected to the inlet. One end of the outlet pipe 333 is connected to the outlet and the other end is connected to the outside. Thus, the driving pump 331 supplies cold energy to the cooling chamber 312 through the inlet pipe 332, and then the cold energy after heat exchange is discharged through the outlet pipe 333, continuously performing heat exchange with the transport parts of the reciprocating mechanism 32 to cool the transport parts. In this embodiment, the driving pump 331 can be an air pump to obtain air from the outside.

[0061] Specifically, the flue gas used in the system comes from the desulfurized flue gas of the boiler, and the temperature is generally around 45-50°C, and the flue gas may contain water. Therefore, in order to ensure that the flue gas entering the adsorption reactor 1 is in a gaseous state and to improve the adsorption efficiency of CO2, it is necessary to increase the flue gas temperature. Therefore, in this embodiment, a heat exchange system 7 is also included. The heat exchange system 7 is an air-to-air heat exchanger. The cold end flue gas inlet of the heat exchange system 7 is connected to a smoke inlet pipe, and the hot end flue gas outlet is connected to the smoke inlet 13. The hot end air inlet of the heat exchange system 7 is connected to the CO2 outlet 224. The cold end gas outlet is connected to the storage subsystem 4, so that the desulfurized flue gas entering from the smoke inlet pipe will exchange heat with the desorbed CO2 (800-900°C), so that the temperature of the desulfurized flue gas will increase to 100-130°C, and then enter the adsorption reactor 1 through the smoke inlet 13. Moreover, because the solid particles in the adsorption chamber adsorb CO2 and release heat, the temperature of the adsorbed flue gas (mainly composed of N2 and O2) is nearly 600°C, and then enters the economizer to continue heat exchange, utilizing the waste heat in the flue gas after adsorption.

[0062] Preferably, the central axis of the adsorption chamber in the adsorption reactor 1 and the central axis of the desorption chamber in the desorption reactor 2 are respectively angled with the horizontal plane at angles A and B, and A and B are both 25-60°. In the present embodiment, A and B are preferably 45° to ensure the flow rate of the solid particles flowing downward from the adsorption feed port 15 to the desorption discharge port 234 under the action of gravity.

[0063] The storage subsystem 4 includes a compressor 41 and a storage tank 42 . The air inlet of the compressor 41 is connected to the cold end air outlet of the heat exchange system 7 . The compressor 41 and the storage tank 42 are connected. The compressor 41 compresses the CO2 after heat exchange and stores it in the storage tank 42 .

[0064] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A moving bed solid adsorption CO2 capture system, characterized in that: It includes an adsorption reactor, a desorption reactor, a circulation transport mechanism and a storage subsystem; The adsorption reactor has a smoke inlet, an air outlet, an adsorption feed inlet and an adsorption discharge port which are connected to the adsorption cavity therein, the air outlet is located above the smoke inlet, and the adsorption feed inlet is located above the adsorption discharge port, so that the solid material at the adsorption feed inlet falls to the adsorption discharge port along the adsorption cavity in the adsorption reactor under the action of gravity; The desorption reactor has a CO2 outlet, a desorption feed port and a desorption discharge port connected to the desorption cavity therein, and the desorption feed port is located above the desorption discharge port, so that the solid material at the desorption feed port falls to the desorption discharge port along the desorption cavity in the desorption reactor under the action of gravity; The adsorption outlet is connected to the desorption feed port, and the adsorption outlet is located above the desorption feed port, so that the adsorption chamber of the adsorption reactor is connected to the desorption chamber of the desorption reactor; The lower feeding end of the circulation transport mechanism is located at the desorption discharge port, and the upper discharging end is located at the adsorption feeding port, so as to transport the solid material desorbed in the desorption reactor to the adsorption reactor; The CO2 outlet is in communication with the storage subsystem; The desorption reactor comprises a sealing section, a desorption section and a cooling section which are sequentially connected from top to bottom; The desorption feed port is located at the upper end of the sealing section, the CO2 outlet is provided on the desorption section, and the desorption discharge port is located at the lower end of the cooling section; The sealing section comprises a first insulation layer and a sealing inner tube, wherein the first insulation layer is sleeved on the outer side of the sealing inner tube, and the desorption feed port is located on the upper end surface of the sealing inner tube; The desorption section comprises a heating layer, a second heat-insulating layer and a desorption inner tube which are sequentially sleeved from the outside to the inside, and the CO2 outlet is located on the desorption inner tube and is connected to the storage subsystem; The cooling section comprises a third insulation layer, a cooling layer and a cooling inner tube which are sequentially sleeved from outside to inside, the desorption outlet is located at the lower end surface of the cooling inner tube, the cooling layer has a cooling cavity, and the cooling cavity is connected to a cooling subsystem outside; The sealing inner tube, the desorption inner tube and the cooling inner tube are connected in sequence from top to bottom.

2. The moving bed solid adsorption CO2 capture system according to claim 1 is characterized in that: The sealed inner tube is provided with a smoke escape port, and the smoke escape port is communicated with the smoke inlet.

3. The moving bed solid adsorption CO2 capture system according to claim 1, characterized in that: The cooling subsystem includes a condensate circulation pipeline of the boiler, and the cooling layer includes a water inlet and a water outlet, and both the water inlet and the water outlet are connected to the condensate circulation pipeline.

4. The moving bed solid adsorption CO2 capture system according to claim 1, characterized in that: Also includes a connecting pipe; The adsorption discharge port is located at the lower end surface of the adsorption reactor, and the desorption feed port is located at the upper end surface of the desorption reactor. The upper and lower ends of the connecting pipe are detachably connected or integrally connected to the lower part of the adsorption reactor and the upper part of the desorption reactor, respectively, so that the desorption feed port is connected to the adsorption discharge port.

5. The moving bed solid adsorption CO2 capture system according to claim 1, characterized in that: The circulating transport mechanism comprises an installation box, a reciprocating mechanism and a cooling assembly, wherein the reciprocating mechanism is arranged in the installation box and is arranged obliquely upward; A heat insulation board is arranged in the installation box, and the heat insulation board divides the installation box into a transport cavity and a cooling cavity, and the cooling assembly is used to supply cold energy to the cooling cavity; The transport member in the reciprocating mechanism moves from the feed end to the discharge end in the transport cavity, and moves from the feed and discharge end to the feed end in the cooling cavity; The desorption outlet is connected to a discharge pipe, the discharge pipe passes downward through the installation box and is located in the transport cavity, and is located above the lower feed end of the reciprocating mechanism; The adsorption feed port is connected to a feed pipe, the feed port of the feed pipe passes through the outer wall of the installation box, the cooling cavity and the insulation board in sequence upward and is located in the transport cavity, and is located below the outer side of the upper feed end of the reciprocating mechanism.

6. The moving bed solid adsorption CO2 capture system according to claim 5, characterized in that: The cooling assembly includes an inlet pipe, an outlet pipe and a driving pump. The upper and lower parts of the cooling chamber are respectively provided with an inlet and an outlet. One end of the inlet pipe is connected to the outlet of the driving pump and the other end is connected to the inlet. One end of the outlet pipe is connected to the outlet and the other end is connected to the outside.

7. The moving bed solid adsorption CO2 capture system according to claim 1, characterized in that: It also includes a heat exchange system; The cold end smoke inlet of the heat exchange system is connected with a smoke inlet pipe, the hot end smoke outlet is connected with the smoke inlet, the hot end air inlet of the heat exchange system is connected with the CO2 outlet, and the cold end air outlet is connected with the storage subsystem; The gas outlet is communicated with the boiler economizer inlet.

8. The moving bed solid adsorption CO2 capture system according to any one of claims 1 to 7, characterized in that: The central axis of the adsorption chamber in the adsorption reactor and the central axis of the reaction chamber in the desorption reactor are both at an angle of 25-60° to the horizontal plane.

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