Carbon dioxide capture and recovery system adopting fluidized bed

Abstract

The utility model relates to the field of gas adsorption, in particular to a carbon dioxide adsorption technology. The carbon dioxide trapping and recycling system adopting the fluidized bed comprises solid amine resin particles for adsorbing carbon dioxide, and further comprises a pipeline for conveying flue gas and a carbon dioxide trapping system, the carbon dioxide trapping system comprises a shell with air tightness, the shell serves as a trapping cavity, and the trapping cavity is provided with a smoke inlet and a smoke outlet; the smoke inlet is communicated with a pipeline for conveying flue gas; the device further comprises a boiling bed mechanism; the fluidized bed mechanism comprises a flat plate serving as a fluidizing plate; the fluidization plate is provided with an opening as an air outlet, and solid amine resin particles are stacked on the fluidization plate to form a bed layer; an air duct is defined by the lower part of the fluidizing plate and the trapping cavity shell, and the air duct is communicated with a fan. The fan drives the high-speed air flow to blow out from the air outlet until the solid amine resin particles are in a fluidized state, and the solid amine resin particles in the fluidized state are in full contact with the flue gas, so that the adsorption efficiency of the solid amine resin particles is improved.

Description

Technical Field

[0001] The utility model relates to the field of gas adsorption, and specifically relates to carbon dioxide adsorption technology. Background Art

[0002] In recent years, as a new type of carbon dioxide adsorbent, solid amine materials have the advantages of high selectivity, good adsorption performance and little corrosion to equipment in the capture and separation of carbon dioxide, and have been widely applied to the carbon dioxide adsorption and removal in closed spaces and the industrial decarbonization field.

[0003] The current common usage method is to fill solid amine resin in a closed space, and let the flue gas pass through the solid amine resin. During the passing process, the solid amine resin adsorbs carbon dioxide in the flue gas.

[0004] However, in this capture and recovery method, the filled solid amine resin causes a certain air resistance to the flow of the flue gas, resulting in poor flue gas circulation and having a certain impact on production. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a carbon dioxide capture and recovery system using a fluidized bed to solve at least one of the above technical problems.

[0006] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0007] A carbon dioxide capture and recovery system using a fluidized bed includes a pipeline for transporting flue gas, and also includes a carbon dioxide capture system. The carbon dioxide capture system includes a hermetic housing as a capture chamber, and the capture chamber is provided with a flue gas inlet and a smoke outlet;

[0008] A valve is arranged at the flue gas inlet, which is called a flue gas inlet valve. The flue gas inlet is connected to the pipeline for transporting flue gas through the flue gas inlet valve, and a filtering mechanism is also arranged before the flue gas inlet valve;

[0009] Another valve is arranged at the smoke outlet, which is called a smoke outlet valve. The smoke outlet is connected to the atmosphere through the smoke outlet valve;

[0010] The fluidized bed mechanism includes a fluidizing plate;

[0011] Solid amine resin particles are stacked on the fluidizing plate;

[0012] It also includes a compressor, and the suction port of the compressor is connected to the inner cavity of the capture chamber;

[0013] The exhaust port of the compressor is connected to a carbon dioxide storage tank through a one-way valve.

[0014] In this design, the carbon dioxide capture and recovery system has a capture chamber, which has an inlet for flue gas to flow through and an outlet for discharging flue gas. The flue gas enters the capture chamber through the inlet, and the carbon dioxide contained therein is adsorbed by the solid amine resin particles, and then the flue gas is discharged from the capture chamber through the outlet.

[0015] A fluidized bed mechanism is also provided in the capture chamber. The solid amine resin particles on the fluidization plate are in a fluidized state. The solid amine resin particles in the fluidized state are suspended with each other and can fully contact the flue gas, thereby improving the adsorption rate of carbon dioxide.

[0016] The solid amine resin particles are stacked on the fluidization plate instead of being filled in the entire capture chamber. Therefore, the air resistance when the flue gas passes through the capture chamber is very small and does not affect the passage of the flue gas.

[0017] The working process of the carbon dioxide capture and recovery system using a fluidized bed is divided into two stages:

[0018] The first stage is to achieve the adsorption of carbon dioxide: In this stage, the flue gas flows through the capture chamber, and the solid amine resin particles are in a fluidized state driven by the high-speed wind of the fan, and can fully contact the flue gas, thereby efficiently adsorbing the carbon dioxide in the flue gas. Maintaining this stage makes the solid amine resin particles reach adsorption saturation, and this stage needs to be maintained for 30 - 45 minutes.

[0019] The second stage is to achieve the desorption and recovery of carbon dioxide: When the adsorption of the solid amine resin particles reaches saturation, the inlet flue gas valve and the outlet flue gas valve are closed, so that the entire capture chamber becomes an airtight space. At this time, a compressor connected to the capture chamber is used to evacuate the capture chamber, and under the vacuum state, carbon dioxide is desorbed from the solid amine resin particles and then recovered into the carbon dioxide storage tank.

[0020] Through the above two stages, the capture, recovery and storage of carbon dioxide in the flue gas are realized, thereby achieving the goal of carbon neutrality and having beneficial social benefits.

[0021] Furthermore, an air outlet array is provided on the fluidization plate, and at least part of the structure of the solid amine resin particles is such that they cannot fall into the air outlets of the air outlet array;

[0022] A wind channel is formed by enclosing the lower part of the fluidization plate and the capture chamber housing, and the wind channel is connected to a fan;

[0023] A baffle for preventing the solid amine resin particles from flying is provided above the fluidization plate, which is called a turbulence baffle, and the turbulence baffle faces the air outlet direction of the air outlet array on the fluidization plate.

[0024] In the above design, in the fluidized bed mechanism, the vulcanization plate and the housing of the lower trapping chamber form an air duct. The fan blows high-speed air into the air duct, and the high-speed air blows out from the air outlet array, driving the solid amine resin particles on the vulcanization plate into a vulcanized state. A turbulence baffle is arranged above the vulcanization plate to prevent the solid amine resin particles from being turbulently blown out of the trapping chamber.

[0025] The air outlets are preferably inclined, which is beneficial to preventing the solid amine resin particles from falling into the air outlet array.

[0026] Furthermore, it also includes a temperature control system;

[0027] The temperature control system includes a heat exchanger, an electric control valve, and a temperature control device;

[0028] The temperature control device includes a temperature measurement sensor and a controller. The controller includes an input interface for receiving temperature values and an output interface for controlling the opening of the electric control valve;

[0029] The heat source inlet of the heat exchanger is connected to the pipeline for transporting flue gas;

[0030] The heat source outlet of the heat exchanger is connected to the flue gas inlet of the trapping chamber;

[0031] An external cold source output port is connected to the cold source inlet of the heat exchanger through an electric control valve;

[0032] The cold source outlet of the heat exchanger is connected to the external cold source recovery port;

[0033] The detection head of the temperature measurement sensor is arranged at the heat source outlet of the heat exchanger, and the measurement value output interface of the temperature measurement sensor is connected to the input interface of the controller;

[0034] The output interface of the controller is connected to the control port of the electric control valve;

[0035] The external cold source adopts a cooling water circulation system.

[0036] In the above design, a temperature control system is arranged between the flue gas transportation pipeline and the solid amine adsorption trapping chamber. The temperature control system includes a heat exchanger and a temperature control device, so that the temperature of the flue gas after heat exchange and cooling by the heat exchanger can be maintained within the temperature range suitable for a high solid amine adsorption rate.

[0037] Multiple experiments have shown that the adsorption capacity of solid amine is 3.85 mmol / g at an adsorption temperature of 55 °C, can reach as high as 4.70 mmol / g at an adsorption temperature of 75 °C, drops to 3.52 mmol / g at an adsorption temperature of 95 °C, and further drops to 2.47 mmol / g when the adsorption temperature is further increased to 115 °C.

[0038] Multiple experiments can be summarized as follows: the optimal temperature range for adapting the adsorption rate of solid amine is 75°C ± 5°C.

[0039] Further optimization includes a heat exchanger; the pipeline for transporting flue gas is connected to the heat source inlet of the heat exchanger; the heat source outlet of the heat exchanger is connected to the flue gas inlet of the capture chamber.

[0040] The heat exchanger adopts a shell-and-tube flue gas heat exchanger.

[0041] In this design, the heat exchanger is used to cool the flue gas so that the temperature of the flue gas is reduced to a temperature at which the adsorption rate of the solid amine resin particles for adsorbing carbon dioxide reaches a relatively high level.

[0042] The shell-and-tube flue gas heat exchanger is suitable for heat exchange between different media, such as flue gas - flue gas, flue gas - steam, flue gas - circulating water, etc. This type of heat exchanger has strong pressure-bearing capacity, simple structure and durability. Choosing the shell-and-tube flue gas heat exchanger has the beneficial effect of relatively low cost and can save construction costs.

[0043] Further optimization includes a heat exchanger; the pipeline for transporting flue gas is connected to the heat source inlet of the heat exchanger; the heat source outlet of the heat exchanger is connected to the flue gas inlet of the capture chamber.

[0044] It also includes an external cold source, and the output port of the external cold source is connected to the cold source inlet of the heat exchanger.

[0045] The cold source outlet of the heat exchanger is connected to the external cold source recovery port.

[0046] The external cold source adopts a cooling water circulation system.

[0047] In the above design, the external cold source adopts a cooling water circulation system, and its beneficial effects are as follows: the cooling water circulation system has mature technology, short construction period, low construction cost and low usage cost.

[0048] Furthermore, the solid amine resin particles include an HP2MGL resin carrier and a solid amine layer provided on the HP2MGL resin carrier.

[0049] In this design, the carrier of the solid amine material should have a suitable pore structure, which can enable the amine source to be evenly distributed on the surface of the carrier pores and provide an interface for the adsorption reaction to occur, so that the adsorption material has good carbon dioxide adsorption capacity and adsorption / desorption rate. Currently, the carriers used for solid amine materials mainly include silica, zeolite, resin, carbon nanotubes and metal-organic frameworks, etc.

[0050] The pore structure of the carrier includes specific surface area, pore diameter, pore volume, etc., which can significantly affect the carbon dioxide adsorption capacity and adsorption rate of the solid amine material. Resin carrier solid amine materials such as HP2MGL, D4020, D3520 with larger pore diameters have higher carbon dioxide adsorption capacities at low temperatures, which is beneficial for environmental adsorption and regeneration under mild temperature fluctuations, and the adsorption capacity gradually decreases with the increase of temperature. Among them, the HP2MGL resin has a relatively larger pore diameter and specific surface area, so the solid amine HP2MGL-50 exhibits the largest carbon dioxide adsorption capacity.

[0051] Further, fins are provided on the housing of the capture chamber, which are called heating fins, and the heating fins are arranged in a fin array;

[0052] Holes are provided on the heating fins. After the holes on the heating fins are arranged in a fin array, they are combined to form a channel, and a heat exchange tube is arranged in the channel. The heat exchange tube is connected to the pipeline for transporting flue gas through a valve.

[0053] In the above design, the desorption of the solid amine is carried out by raising the temperature. Fins are provided on the housing of the capture chamber, the fins are arranged in an array, a heat exchange tube is arranged on the fin array, and flue gas is introduced into the heat exchange tube. The temperature of the flue gas is about 170 to 200 degrees, which can be used to raise the temperature of the capture chamber, and then the solid amine is desorbed to release carbon dioxide. The beneficial effect is that the waste heat of the flue gas is used as the heat source for the desorption of the solid amine, which can reduce energy waste and improve economic benefits.

[0054] Further, the filtering mechanism includes a coarse filtering layer and a fine filtering layer;

[0055] The coarse filtering layer uses PP cotton with a minimum filtration of 5μm;

[0056] The fine filtering layer uses PP cotton with a minimum filtration of 1μm.

[0057] In the above design, a filtering mechanism is provided in front of the flue gas inlet valve. Its function is to filter the suspended impurities in the flue gas. The clean flue gas can prevent the solid amine resin particles from being contaminated by impurities, prevent the carbon dioxide adsorption rate of the solid amine from decreasing due to contamination, extend the service life of the solid amine, and thus save costs and improve economic benefits.

[0058] The filtering mechanism uses a coarse filtering layer and a fine filtering layer for economic considerations. The size of the suspended matter intercepted by the coarse filtering layer is large, so the coarse filtering layer is more likely to accumulate ash and needs to be replaced more frequently. At this time, the fine filtering layer can still be used.

[0059] If a two-layer structure is not adopted, the side of the filtering layer facing the inlet will accumulate a lot of ash, while the other side will accumulate very little ash. Replacing them together will cause waste and low economic efficiency.

[0060] Furthermore, it also includes an electric sequential switching valve and at least two gas paths of carbon dioxide storage tanks;

[0061] The electric sequential switching valve uses a switching valve with one inlet and multiple outlets. The one inlet and multiple outlets are sequentially switched and connected within the switching valve;

[0062] The electric sequential switching valve also has a switching input interface for controlling and triggering the sequential switching of the paths;

[0063] One-way valves are provided in the gas paths of the carbon dioxide storage tanks, and the one-way valves are connected to the carbon dioxide storage tanks;

[0064] The exhaust port of the compressor is connected to the inlet of the electric sequential switching valve;

[0065] The multiple outlets of the electric sequential switching valve are sequentially connected to at least two gas paths of the carbon dioxide storage tanks;

[0066] Pressure sensors are respectively provided in at least two gas paths of the carbon dioxide storage tanks, which are called gas storage pressure sensors,

[0067] The gas storage pressure sensor is a pressure sensor with a preset pressure value, and outputs an overpressure signal after the pressure exceeds the preset pressure value;

[0068] The overpressure signal output end of the gas storage pressure sensor is connected to the switching input interface of the electric sequential switching valve.

[0069] This design uses solid amine resin particles to realize the adsorption and desorption recovery of carbon dioxide gas, and cycles repeatedly between adsorption and desorption. Therefore, it is time-consuming and laborious to manually monitor the pressure of the carbon dioxide storage tanks and replace the carbon dioxide storage tanks, with low efficiency.

[0070] This design introduces an electric sequential switching valve, which can automatically switch to the next carbon dioxide storage tank to continue storing carbon dioxide after one carbon dioxide storage tank is full of carbon dioxide.

[0071] One-way valves are provided in the gas paths of the carbon dioxide storage tanks. The one-way valves can prevent the carbon dioxide gas in the carbon dioxide storage tanks from flowing back. Therefore, under the action of the compressor, the pressure in the carbon dioxide storage tanks will gradually increase.

[0072] The function of the gas storage pressure sensor is to detect the air pressure in the carbon dioxide gas storage tank. When the air pressure reaches the set value, the gas storage pressure sensor sends an overpressure signal to the switching input interface of the electric sequential switching valve. After receiving the overpressure signal, the import of the electric sequential switching valve switches to connect to the outlet of the next sequence, and then stores the carbon dioxide gas extracted by the compressor into another empty carbon dioxide gas storage tank. The originally overpressured outlet is connected to the atmosphere, and the high pressure in the gas pipeline between the one-way valve and the electric sequential switching valve is released. The gas storage pressure sensor that originally sent the overpressure signal stops outputting the overpressure signal due to the disappearance of the pressure.

[0073] Through the cooperative work of the electric sequential switching valve and the gas storage pressure sensor, this design can achieve unattended operation for a long time, reduce labor costs, and improve production efficiency.

[0074] The present invention controls the temperature of the flue gas within the temperature range suitable for the best adsorption efficiency of the solid amine resin particles through the temperature control system, and then utilizes the adsorption and desorption capabilities of the solid amine resin particles for carbon dioxide to capture and recover the carbon dioxide in the flue gas, thereby achieving the goal of carbon neutrality and having beneficial social benefits.

[0075] Its beneficial effect also lies in that the solid amine resin particles adopt the method of temperature rise for desorption, and the heat source for temperature rise utilizes the high-temperature waste heat of the flue gas itself, thereby reducing energy waste and achieving the social goal of emission reduction and efficiency improvement.

[0076] Its beneficial effect also lies in that the electric sequential switching valve and the gas storage pressure sensor cooperate to work, solve the technical problem of automatically switching the carbon dioxide gas storage tank, can achieve unattended continuous automatic operation for a long time, save labor costs, and improve production benefits. Description of the Drawings

[0077] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0078] Figure 1 is a schematic diagram of the carbon dioxide capture and recovery system;

[0079] Figure 2 is a schematic diagram of the fins and heat exchange tubes outside the capture chamber housing;

[0080] Figure 3 is a schematic diagram of multi-channel switching gas storage.

[0081] Symbol Explanation:

[0082] 1. Heat exchanger; 2. Electric control valve; 3. Temperature control device; 4. Temperature measuring sensor; 5. Smoke inlet; 6. Capture chamber; 7. Turbulence baffle; 8. Smoke outlet; 9. Solid amine resin particles; 10. Fluidization plate; 11. Carbon dioxide gas storage tank; 12. Check valve; 13. Compressor; 14. Air duct; 15. Fan; 16. Fins; 17. Heat exchange tube; 18. Electric sequential switching valve; 19. Gas storage pressure sensor. Detailed implementation manners

[0083] To make the above objects, features and advantages of the present utility model more comprehensible, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings of the specification.

[0084] In the following description, many specific details are set forth to facilitate a thorough understanding of the present utility model. However, the present utility model may be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0085] Secondly, the present utility model will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present utility model, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present utility model herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0086] Furthermore, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures or characteristics that may be included in at least one implementation manner of the present utility model. The "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is separate or selectively mutually exclusive with other embodiments.

[0087] Referring to Figure 1 As shown, a carbon dioxide capture and recovery system using a fluidized bed includes a pipeline for transporting flue gas, and also includes a carbon dioxide capture system. The carbon dioxide capture system includes an airtight housing, serving as the capture chamber 6. The capture chamber 6 is provided with a smoke inlet 5 and a smoke outlet 8;

[0088] A valve is provided at the smoke inlet 5, which is called the smoke inlet valve. The smoke inlet 5 is connected to the pipeline for transporting flue gas through the smoke inlet valve, and a filtering mechanism is also provided before the smoke inlet valve;

[0089] Another valve is provided at the smoke outlet 8, which is called the smoke outlet valve. The smoke outlet 8 is connected to the atmosphere through the smoke outlet valve;

[0090] The fluidized bed mechanism includes a fluidization plate 10;

[0091] Solid amine resin particles 9 are stacked on the fluidized plate 10;

[0092] It further includes a compressor 13, and the suction port of the compressor 13 is communicated with the inner cavity of the capture chamber 6;

[0093] The exhaust port of the compressor 13 is communicated with a carbon dioxide storage tank 11 through a one-way valve 12.

[0094] In this embodiment, the carbon dioxide capture and recovery system has a capture chamber 6, and the capture chamber 6 has a flue gas inlet 5 and a flue gas outlet 8 for the flow of flue gas. The flue gas enters the capture chamber 6 from the inlet 5, and the carbon dioxide contained therein is adsorbed by the solid amine resin particles 9, and then the flue gas is discharged from the capture chamber 6 through the outlet 8.

[0095] A fluidized bed mechanism is further provided in the capture chamber 6. The solid amine resin particles 9 on the fluidized plate 10 are in a fluidized state. In the fluidized state, the solid amine resin particles 9 are suspended with each other, can fully contact the flue gas, and thus improve the adsorption rate of carbon dioxide.

[0096] The solid amine resin particles 9 are stacked on the fluidized plate 10 instead of being filled in the entire capture chamber 6. Therefore, the wind resistance when the flue gas passes through the capture chamber 6 is very small, and it does not affect the passage of the flue gas.

[0097] The working process of the carbon dioxide capture and recovery system using a fluidized bed is divided into two stages:

[0098] The first stage is to achieve the adsorption of carbon dioxide: In this stage, the flue gas flows through the capture chamber 6, and the solid amine resin particles 9 are in a fluidized state driven by the high-speed wind of the fan 15, can fully contact the flue gas, and thus efficiently adsorb the carbon dioxide in the flue gas. Maintaining this stage makes the solid amine resin particles 9 reach adsorption saturation. This stage needs to be maintained for 30 to 45 minutes.

[0099] The second stage is to achieve the desorption and recovery of carbon dioxide: When the adsorption of the solid amine resin particles 9 reaches saturation, the inlet flue gas valve and the outlet flue gas valve are closed, so that the entire capture chamber 6 becomes an airtight space. At this time, the capture chamber 6 is evacuated by a compressor 13 communicated with the capture chamber 6. Under the vacuum state, carbon dioxide is desorbed from the solid amine resin particles 9 and then recovered into the carbon dioxide storage tank 11.

[0100] Through the above two stages, the capture and recovery storage of carbon dioxide in the flue gas are realized, thus achieving the goal of carbon neutrality and having beneficial social benefits.

[0101] Furthermore, an air outlet array is provided on the fluidized plate 10, and at least part of the structure of the solid amine resin particles 9 is such that they cannot fall into the air outlets of the air outlet array;

[0102] Below the fluidized plate 10 and the housing of the capture chamber 6 enclose an air duct 14, and the air duct 14 communicates with a blower 15;

[0103] Above the fluidized plate 10, there is a baffle for preventing the solid amine resin particles 9 from scattering, called the turbulence baffle 7, and the turbulence baffle 7 faces the air outlet direction of the air outlet array on the fluidized plate 10.

[0104] In this embodiment, in the fluidized bed mechanism, the vulcanized plate and the housing of the capture chamber 6 below form an air duct 14, and the blower 15 blows high-speed air into the air duct 14, and the high-speed air blows out from the air outlet array, driving the solid amine resin particles 9 on the vulcanized plate into a vulcanized state. The turbulence baffle 7 provided above the fluidized plate is used to prevent the solid amine resin particles 9 from being blown out of the capture chamber 6 by the turbulence.

[0105] The air outlets are preferably inclined, which is beneficial to preventing the solid amine resin particles 9 from falling into the air outlet array.

[0106] Furthermore, it further includes a temperature control system;

[0107] The temperature control system includes a heat exchanger 1, an electric control valve 2 and a temperature control device 3;

[0108] The temperature control device 3 includes a temperature measuring sensor 4 and a controller. The controller includes an input interface for receiving temperature values and an output interface for controlling the opening of the electric control valve 2;

[0109] The heat source inlet of the heat exchanger 1 communicates with the pipeline for transporting flue gas;

[0110] The heat source outlet of the heat exchanger 1 communicates with the flue gas inlet 5 of the capture chamber 6;

[0111] An external cold source outlet communicates with the cold source inlet of the heat exchanger 1 through the electric control valve 2;

[0112] The cold source outlet of the heat exchanger 1 communicates with the external cold source recovery port;

[0113] The detection head of the temperature measuring sensor 4 is arranged at the heat source outlet of the heat exchanger 1, and the measurement value output interface of the temperature measuring sensor 4 is connected to the input interface of the controller;

[0114] The output interface of the controller is connected to the control port of the electric control valve 2;

[0115] The external cold source adopts a cooling water circulation system.

[0116] In this embodiment, a temperature control system is provided between the flue gas transportation pipeline and the solid amine adsorption capture chamber 6. The temperature control system includes a heat exchanger 1 and a temperature control device 3, so that the temperature of the flue gas cooled by heat exchange in the heat exchanger 1 can be maintained within the temperature range required for a high solid amine adsorption rate.

[0117] Multiple experiments have shown that the adsorption capacity of solid amine is 3.85 mmol / g at an adsorption temperature of 55 °C, can reach as high as 4.70 mmol / g when the adsorption temperature is 75 °C, drops to 3.52 mmol / g when the adsorption temperature is 95 °C, and further drops to 2.47 mmol / g when the adsorption temperature is further increased to 115 °C.

[0118] Multiple experiments can be summarized as follows: the optimal temperature range for adapting the adsorption rate of solid amine is 75 °C ± 5 °C.

[0119] Further optimization includes a heat exchanger 1; the pipeline for conveying flue gas is connected to the heat source inlet of the heat exchanger 1; the heat source outlet of the heat exchanger 1 is connected to the flue gas inlet 5 of the capture chamber 6;

[0120] The heat exchanger 1 adopts a shell-and-tube flue gas heat exchanger.

[0121] In this embodiment, the heat exchanger 1 is used to cool the flue gas so that the temperature of the flue gas is reduced to a temperature suitable for the adsorption rate of the solid amine resin particles 9 to adsorb carbon dioxide to reach a relatively high level.

[0122] The shell-and-tube flue gas heat exchanger is suitable for heat exchange between different media, such as flue gas - flue gas, flue gas - steam, flue gas - circulating water, etc. This kind of heat exchanger has strong pressure-bearing capacity, simple and durable structure. Choosing the shell-and-tube flue gas heat exchanger, its beneficial effect lies in the lower cost and can save construction costs.

[0123] Further optimization includes a heat exchanger 1; the pipeline for conveying flue gas is connected to the heat source inlet of the heat exchanger 1; the heat source outlet of the heat exchanger 1 is connected to the flue gas inlet 5 of the capture chamber 6;

[0124] It also includes an external cold source, and the output port of the external cold source is connected to the cold source inlet of the heat exchanger 1;

[0125] The cold source outlet of the heat exchanger 1 is connected to the external cold source recovery port;

[0126] The external cold source adopts a cooling water circulation system.

[0127] In this embodiment, the external cold source adopts a cooling water circulation system, and its beneficial effect lies in that: the cooling water circulation system has mature technology, short construction period, low construction cost, and low use cost.

[0128] Furthermore, the solid amine resin particles 9 include an HP2MGL resin carrier and a solid amine layer provided on the HP2MGL resin carrier.

[0129] In this embodiment, the carrier of the solid amine material should have a suitable pore structure, which can evenly distribute the amine source on the surface of the carrier pores and provide an interface for the adsorption reaction to occur, enabling the adsorption material to have good carbon dioxide adsorption capacity and adsorption / desorption rate. Currently, the carriers used for solid amine materials mainly include silica, zeolite, resin, carbon nanotubes, and metal-organic frameworks, etc.

[0130] The pore structure of the carrier includes specific surface area, pore diameter, pore volume, etc., which can significantly affect the carbon dioxide adsorption capacity and adsorption rate of the solid amine material. Resin carrier solid amine materials such as HP2MGL, D4020, and D3520 with larger pore diameters have higher carbon dioxide adsorption capacities at low temperatures, which is beneficial for environmental adsorption and regeneration under mild temperature fluctuations, and the adsorption capacity gradually decreases with the increase in temperature. Among them, the HP2MGL resin has a relatively large pore diameter and specific surface area, so the solid amine HP2MGL-50 exhibits the largest carbon dioxide adsorption capacity.

[0131] Refer to Figure 2 As shown, fins 16 are provided on the housing of the capture chamber 6, which are called heating fins 16, and the heating fins 16 are arranged in a fin 16 array;

[0132] Holes are provided on the heating fins 16. After the holes on the heating fins 16 are arranged in a fin 16 array, they combine to form a channel, and a heat exchange tube 17 is arranged in the channel. The heat exchange tube 17 is connected to the pipeline for transporting flue gas through a valve.

[0133] In this embodiment, the desorption of the solid amine is carried out by raising the temperature. Fins 16 are provided on the housing of the capture chamber 6, the fins 16 are arranged in an array, a heat exchange tube 17 is arranged on the fin 16 array, and flue gas is introduced into the heat exchange tube 17. The temperature of the flue gas is about 170 to 200 degrees, which can be used to raise the temperature of the capture chamber 6, and then the solid amine is desorbed to release carbon dioxide. The beneficial effect is that using the waste heat of the flue gas as the heat source for solid amine desorption can reduce energy waste and improve economic benefits.

[0134] Furthermore, the filtering mechanism includes a coarse filtering layer and a fine filtering layer;

[0135] The coarse filtering layer uses PP cotton with a minimum filtration of 5μm;

[0136] The fine filtering layer uses PP cotton with a minimum filtration of 1μm.

[0137] In this embodiment, a filtering mechanism is arranged in front of the flue gas inlet valve. Its function is to filter the suspended impurities in the flue gas. The clean flue gas can prevent the solid amine resin particles 9 from being contaminated by impurities, prevent the carbon dioxide adsorption rate of the solid amine from decreasing due to contamination, extend the service life of the solid amine, and thus save costs and improve economic benefits.

[0138] The filtering mechanism adopts a coarse filtering layer and a fine filtering layer for economic considerations. The size of the suspended matter intercepted by the coarse filtering layer is large, so the coarse filtering layer is more likely to accumulate dust and needs to be replaced more frequently. At this time, the fine filtering layer can still be used.

[0139] If a two-layer structure is not adopted, the side of the filtering layer facing the intake air will accumulate a large amount of dust, while the other side will accumulate very little dust. Replacing them together will cause waste and low economy.

[0140] Refer to Figure 3 As shown, it also includes an electric sequential switching valve 18 and at least two gas paths of the carbon dioxide storage tank 11;

[0141] The electric sequential switching valve 18 adopts a switching valve with one inlet and multiple outlets. The one inlet and multiple outlets are sequentially switched and communicated within the switching valve;

[0142] The electric sequential switching valve 18 also has a switching input interface for controlling the sequential switching of the trigger path;

[0143] A one-way valve 12 is provided in the gas path of the carbon dioxide storage tank 11, and the one-way valve 12 is communicated with the carbon dioxide storage tank 11;

[0144] The exhaust port of the compressor 13 is communicated with the inlet of the electric sequential switching valve 18;

[0145] The multiple outlets of the electric sequential switching valve 18 are sequentially communicated with at least two gas paths of the carbon dioxide storage tank 11;

[0146] Pressure sensors are respectively provided in at least two gas paths of the carbon dioxide storage tank 11, which are called gas storage pressure sensors 19,

[0147] The gas storage pressure sensor 19 adopts a pressure sensor with a preset pressure value, and outputs an overpressure signal when the pressure exceeds the preset pressure value;

[0148] The overpressure signal output end of the gas storage pressure sensor 19 is communicated with the switching input interface of the electric sequential switching valve 18.

[0149] This design uses solid amine resin particles 9 to realize the adsorption and desorption recovery of carbon dioxide gas, cycling between adsorption and desorption. Therefore, it is time-consuming, laborious and inefficient to manually monitor the pressure of the carbon dioxide storage tank 11 and replace the carbon dioxide storage tank 11.

[0150] This design introduces an electric sequential switching valve 18, which can automatically switch to the next carbon dioxide storage tank 11 to continue storing carbon dioxide after one carbon dioxide storage tank 11 is full of carbon dioxide.

[0151] A one-way valve 12 is provided in the gas path of the carbon dioxide storage tank 11. The one-way valve 12 can prevent the carbon dioxide gas in the carbon dioxide storage tank 11 from flowing back. Therefore, under the action of the compressor 13, the pressure in the carbon dioxide storage tank 11 will gradually increase.

[0152] The function of the gas storage pressure sensor 19 is to detect the air pressure in the carbon dioxide storage tank 11. When the air pressure reaches the set value, the gas storage pressure sensor 19 sends an overpressure signal to the switching input interface of the electric sequence switching valve 18. After receiving the overpressure signal, the switching input interface causes the inlet of the electric sequence switching valve 18 to switch and communicate with the outlet of the next sequence, thereby storing the carbon dioxide gas extracted by the compressor 13 into another empty carbon dioxide storage tank 11. The originally overpressured outlet communicates with the atmosphere, and the high pressure in the gas path pipeline between the one-way valve 12 and the electric sequence switching valve 18 is released. The gas storage pressure sensor 19 that originally sent the overpressure signal stops outputting the overpressure signal due to the disappearance of the pressure.

[0153] Through the coordinated operation of the electric sequence switching valve 18 and the gas storage pressure sensor 19, this design can achieve unattended operation for a long time, reduce labor costs, and improve production efficiency.

[0154] In addition, to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described, that is, those features that are not relevant to the currently considered best mode of implementing the present invention, or those features that are not relevant to the implementation of the present invention.

[0155] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine task of design, manufacturing, and production.

[0156] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A carbon dioxide capture and recovery system using a fluidized bed, comprising a pipeline for transporting flue gas, and further comprising a carbon dioxide capture system, characterized in that, The carbon dioxide capture system includes an airtight housing as a capture chamber, and the capture chamber is provided with a flue gas inlet and a flue gas outlet. A valve is provided at the flue gas inlet, which is called the flue gas inlet valve. The flue gas inlet is connected to the pipeline for transporting flue gas through the flue gas inlet valve, and a filtering mechanism is also provided before the flue gas inlet valve. Another valve is provided at the flue gas outlet, which is called the flue gas outlet valve. The flue gas outlet is connected to the atmosphere through the flue gas outlet valve. The fluidized bed mechanism includes a fluidizing plate. Solid amine resin particles are stacked on the fluidizing plate. It also includes a compressor, and the suction port of the compressor is connected to the inner cavity of the capture chamber. The exhaust port of the compressor is connected to a carbon dioxide storage tank through a check valve.

2. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that, An air outlet array is provided on the fluidizing plate, and the structure of at least part of the solid amine resin particles is such that they cannot fall into the air outlets of the air outlet array. A wind channel is formed by enclosing the lower part of the fluidizing plate and the housing of the capture chamber, and the wind channel is connected to a fan. A baffle for preventing the solid amine resin particles from scattering is provided above the fluidizing plate, which is called a turbulence baffle, and the turbulence baffle faces the air outlet direction of the air outlet array on the fluidizing plate.

3. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that, It also includes a temperature control system. The temperature control system includes a heat exchanger, an electric control valve, and a temperature control device. The temperature control device includes a temperature measuring sensor and a controller. The controller includes an input interface for receiving temperature values and an output interface for controlling the opening of the electric control valve. The heat source inlet of the heat exchanger is connected to the pipeline for transporting flue gas. The heat source outlet of the heat exchanger is connected to the flue gas inlet of the capture chamber. An external cold source output port is connected to the cold source inlet of the heat exchanger through an electric control valve. The cold source outlet of the heat exchanger is connected to the external cold source recovery port. The detection head of the temperature measuring sensor is arranged at the heat source outlet of the heat exchanger, and the measurement value output interface of the temperature measuring sensor is connected to the input interface of the controller. The output interface of the controller is connected to the control port of the electric control valve. The external cold source adopts a cooling water circulation system.

4. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that It includes a heat exchanger. The pipeline for transporting flue gas is connected to the heat source inlet of the heat exchanger. The heat source outlet of the heat exchanger is connected to the flue gas inlet of the capture chamber. The heat exchanger adopts a shell-and-tube flue gas heat exchanger.

5. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that, It includes a heat exchanger. The pipeline for transporting flue gas is connected to the heat source inlet of the heat exchanger. The heat source outlet of the heat exchanger is connected to the flue gas inlet of the capture chamber. It also includes an external cold source, and the output port of the external cold source is connected to the cold source inlet of the heat exchanger. The cold source outlet of the heat exchanger is connected to the external cold source recovery port. The external cold source adopts a cooling water circulation system.

6. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that, The solid amine resin particles include an HP2MGL resin carrier and a solid amine layer provided on the HP2MGL resin carrier.

7. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, wherein Fins are provided on the housing of the capture chamber, which are called heating fins, and the heating fins are arranged in a fin array. Holes are provided on the heating fins. After the holes on the heating fins are arranged in a fin array, they combine to form a channel, and a heat exchange tube is arranged in the channel. The heat exchange tube is connected to the pipeline for transporting flue gas through a valve.

8. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that, The filtering mechanism includes a coarse filter layer and a fine filter layer. The coarse filter layer adopts PP cotton with a minimum filtration of 5μm. The fine filter layer adopts PP cotton with a minimum filtration of 1μm.

9. The carbon dioxide capture and recovery system using a fluidized bed according to claim 1, characterized in that, It also includes an electric sequential switching valve and at least two carbon dioxide storage tank gas paths. Electric sequential switching valve, which uses a switching valve with one inlet and multiple outlets, and the one inlet and multiple outlets are sequentially switched and communicated within the switching valve; The electric sequential switching valve also has a switching input interface for controlling the sequential switching of the trigger path; A check valve is provided in the gas path of the carbon dioxide gas storage tank, and the check valve is communicated with the carbon dioxide gas storage tank; The exhaust port of the compressor is communicated with the inlet of the electric sequential switching valve; The multiple outlets of the electric sequential switching valve are sequentially communicated with at least two carbon dioxide gas storage tank gas paths; Pressure sensors are respectively provided in at least two carbon dioxide gas storage tank gas paths, which are called gas storage pressure sensors, The gas storage pressure sensor uses a pressure sensor with a preset pressure value and outputs an overpressure signal after the pressure exceeds the preset pressure value; The overpressure signal output end of the gas storage pressure sensor is communicated with the switching input interface of the electric sequential switching valve.

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