Carbon dioxide trapping and recycling system suitable for flue gas

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 suitable for the flue gas comprises solid amine resin for adsorbing carbon dioxide, a pipeline for conveying the flue gas and a temperature control system, the temperature control system comprises a heat exchanger, and the temperature of the flue gas cooled by the heat exchanger is matched with the temperature required by the optimal adsorption rate of the solid amine resin for adsorbing carbon dioxide. The device further comprises an exchange cavity, the exchange cavity is filled with solid amine resin, flue gas at the adaptive temperature is adsorbed by solid amine after passing through the exchange cavity, carbon dioxide is removed by the solid amine after the exchange cavity is heated, and the removed carbon dioxide is collected into a carbon dioxide storage tank through a compressor, so that capture and recovery of the carbon dioxide in the flue gas are realized. The carbon neutralization target is achieved, and beneficial social benefits are achieved.

Description

Technical Field

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

[0002] Some high-energy-consuming industries, such as the petroleum, coking, metal smelting, electric power and heat industries, consume a large amount of energy, thus causing a large amount of flue gas emissions.

[0003] The main components of flue gas include nitrogen, carbon dioxide, oxygen and water vapor, as well as a small amount of sulfides. In coal-fired power plants, the general flue gas discharge temperature is about 170 to 200 degrees. In some industrial applications, the temperature of flue gas may be higher.

[0004] In recent years, solid amine materials, as a new type of carbon dioxide adsorbent, have the advantages of high selectivity, good adsorption performance and little corrosion to equipment in the capture and separation of carbon dioxide. They have become a research hotspot in the field of carbon dioxide adsorption and removal in enclosed spaces and industrial decarbonization. However, solid amine has high requirements for the adsorption temperature. Too low or too high temperature will lead to a decrease in the carbon dioxide adsorption rate of solid amine, thus resulting in the inability to directly adsorb carbon dioxide in flue gas through solid amine. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a carbon dioxide capture and recovery system applicable to flue gas 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 applicable to flue gas includes a solid amine resin for adsorbing carbon dioxide, a pipeline for transporting flue gas, and a carbon dioxide capture system connected to the pipeline;

[0008] The carbon dioxide capture system includes a shell with airtightness as an exchange cavity, and the exchange cavity is filled with solid amine resin;

[0009] The exchange cavity is provided with a flue gas inlet and a flue gas outlet;

[0010] A valve is arranged at the flue gas inlet, called the flue gas inlet valve. The flue gas inlet valve is connected to the pipeline for transporting flue gas, and a filtering mechanism is also arranged before the flue gas inlet valve;

[0011] Another valve is arranged at the flue gas outlet, called the flue gas outlet valve. The flue gas outlet valve is connected to the atmosphere;

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

[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 an exchange chamber, which has a flue gas inlet and a flue gas outlet for the flow of flue gas. The working process of the carbon dioxide capture and recovery system applicable to flue gas is divided into two stages:

[0015] The first stage is to achieve the adsorption of carbon dioxide: In this stage, the flue gas flows through the exchange chamber, and the solid amine resin adsorbs carbon dioxide in the flue gas. After a certain adsorption time, the solid amine resin reaches saturated adsorption. This stage needs to be maintained for 30 - 45 minutes.

[0016] The second stage is to achieve the desorption and recovery of carbon dioxide: When the adsorption of the solid amine resin reaches saturation, the flue gas inlet valve and the flue gas outlet valve are closed, so that the entire exchange chamber becomes an airtight space. At this time, a compressor connected to the exchange chamber evacuates the exchange chamber. Under vacuum conditions, carbon dioxide is desorbed from the solid state and recovered into the carbon dioxide storage tank.

[0017] Through the above two stages, the carbon dioxide in the flue gas is captured, recovered and stored, thus achieving the goal of carbon neutrality and having beneficial social benefits.

[0018] Furthermore, it also includes a temperature control system;

[0019] The temperature control system includes a heat exchanger, an electric control valve and a temperature control device;

[0020] 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;

[0021] The pipeline for transporting flue gas is connected to the heat source inlet of the heat exchanger;

[0022] The heat source outlet of the heat exchanger is connected to the flue gas inlet valve of the exchange chamber;

[0023] An external cold source output port is connected to the cold source inlet of the heat exchanger through an electric control valve;

[0024] The cold source outlet of the heat exchanger is connected to the external cold source recovery port;

[0025] 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;

[0026] The output interface of the controller is connected to the control port of the electric control valve.

[0027] In the above design, a temperature control system is provided between the flue gas conveying pipeline and the solid amine adsorption and exchange 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 required for high solid amine adsorption rate.

[0028] 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.

[0029] Multiple experiments can be summarized as follows: the optimal temperature range for adapting the solid amine adsorption rate is 75 °C ± 5 °C.

[0030] For further optimization, a shell-and-tube flue gas heat exchanger is used as the heat exchanger.

[0031] 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 for adsorbing carbon dioxide reaches a relatively high level.

[0032] 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 has the beneficial effect of lower cost and can save construction costs.

[0033] For further optimization, the external cold source adopts a cooling water circulation system.

[0034] 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.

[0035] Furthermore, the solid amine adopts a polyethyleneimine material, and the carrier structure of the solid amine adopts an HP2MGL resin structure.

[0036] In this design, polyethyleneimine (PEI) is an amino polymer. Amino polymers have a relatively high amino density (nitrogen content is 33% (w)), and can enable the solid amine to obtain good stability during the adsorption and desorption cycles, so it is preferentially selected as the amine source.

[0037] In this design, 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.

[0038] 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 capacity 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.

[0039] Furthermore, fins are provided on the shell of the exchange chamber, which are called heating fins, and the heating fins are arranged in a fin array;

[0040] 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 metal pipe is arranged in the channel. The metal pipe is connected to the pipe for transporting flue gas through a valve.

[0041] In the above design, the desorption of the solid amine is carried out by raising the temperature. Fins are provided on the shell of the exchange chamber, the fins are arranged in an array, a metal pipe is arranged on the fin array, and flue gas is introduced into the metal pipe. The temperature of the flue gas is about 170 to 200 degrees, which can be used to raise the temperature of the exchange chamber, 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 the desorption of the solid amine can reduce energy waste and improve economic benefits.

[0042] Furthermore, both the inlet flue gas valve and the outlet flue gas valve are normally open electrically controlled valves, and the normally open electrically controlled valve has a closing signal port for controlling the valve to close;

[0043] The compressor has a start signal interface for controlling the start;

[0044] It also includes a timing control system;

[0045] The timing control system includes at least two timing control devices, which are respectively called the first timing and the second timing;

[0046] The timing control device includes a timer. After the timer runs to the set duration, the timing control device outputs a control signal through the control output interface;

[0047] The timing control device is also provided with a reset input interface for triggering the timer to restart timing operation. During the operation of the timer, the control output interface turns off the output control signal;

[0048] The control output interface of the first timing sequence is connected to the reset input interface of the second timing sequence;

[0049] The control output interface of the second timing sequence is connected to the reset input interface of the first timing sequence;

[0050] The control output interface of the first timing sequence is also connected to the closing signal ports of the smoke inlet valve and the smoke exhaust valve respectively;

[0051] The first timing control output interface is also connected to the compressor start signal interface;

[0052] The setting time of the first sequence timer is 30 to 45 minutes;

[0053] The setting duration of the timer of the second sequence is 15 to 20 minutes.

[0054] In the above design, the adsorption stage and the release stage are realized by a timing control system, and the two stages are cyclically repeated. The beneficial effect is that the efficiency of carbon dioxide adsorption recovery is improved and human intervention is reduced to save labor costs, thereby improving economic benefits.

[0055] Furthermore, the timer may be a hardware system or a software system.

[0056] In the above design, the timer is used to control the switching of the two working stages of the solid amine. The switching of these two working stages will not affect the entire workflow if it is advanced or delayed by a few minutes, so the timer does not need to be very accurate.

[0057] One way to implement a timer is to use the characteristic that it takes a certain amount of time for a capacitor to charge. When the capacitor reaches a threshold, a reed switch or other switch-type electronic device is used to implement a trigger circuit, triggering another capacitor to start charging while outputting an electrical signal as an output control signal. When the charging value of another capacitor reaches the threshold, the trigger circuit is reversed again, and while outputting an electrical signal as an output control signal, the first capacitor is charged again. In this way, conventional electronic components such as capacitors, resistors, and switch-type electronic devices are used to implement the cycle of two timers. This type of timer is simple, reliable, and has a low cost.

[0058] Another way to implement the timer is to use a timer built into an intelligent system such as a microprocessor system or a programmable control system, or to combine the software system running in the intelligent system to realize the cyclic operation of two timers. The present invention supports the timer implemented in this way, so that the corresponding function can be more flexibly combined with hardware or software.

[0059] Further, the filtering mechanism includes a coarse filtration layer and a fine filtration layer;

[0060] The coarse filtration layer uses PP cotton with a minimum filtration of 5 μm;

[0061] The fine filtration layer uses PP cotton with a minimum filtration of 1 μm.

[0062] In the above design, a filtering mechanism is provided in front of the smoke inlet valve. Its function is to filter the suspended impurities in the flue gas. The clean flue gas can prevent the solid amine resin 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.

[0063] The filtering mechanism uses a coarse filtration layer and a fine filtration layer for economic considerations. The size of the suspended matter intercepted by the coarse filtration layer is large, so the coarse filtration layer is more likely to accumulate ash and has a higher replacement frequency. At this time, the fine filtration layer can still be used.

[0064] If a two-layer structure is not adopted, the side of the filter layer facing the air 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.

[0065] Further, it also includes an electric sequence switching valve and at least two carbon dioxide gas storage tank gas paths;

[0066] The electric sequence switching valve uses a switching valve with one inlet and multiple outlets. The one inlet and multiple outlets are sequentially switched and connected inside the switching valve;

[0067] The electric sequence switching valve also has a switching input interface for controlling the sequential switching of the trigger paths;

[0068] The carbon dioxide gas storage tank gas path includes a check valve and a carbon dioxide gas storage tank. The outlet of the check valve is connected to the inlet gas path of the carbon dioxide gas storage tank;

[0069] The exhaust port of the compressor is connected to the inlet of the electric sequence switching valve;

[0070] The multiple outlets of the electric sequence switching valve are sequentially connected to the inlets of the respective check valves;

[0071] A pressure sensor, called a gas storage pressure sensor, is also provided in the gas path pipeline connecting the electric sequence switching valve and the check valve. The gas storage pressure sensor uses a pressure sensor with a preset pressure value and outputs an overpressure signal when the gas path pipeline pressure exceeds the preset pressure value;

[0072] The overpressure signal output interface of the gas storage pressure sensor is signal-connected to the switching input interface of the electric sequence switching valve.

[0073] The present invention utilizes solid amine resin to achieve the adsorption and desorption recovery of carbon dioxide gas, cycling repeatedly between adsorption and desorption. Therefore, it is time-consuming and laborious to manually monitor the pressure of the carbon dioxide gas storage tank and replace the carbon dioxide gas storage tank, with low efficiency.

[0074] This design introduces an electric sequential switching valve, which can automatically switch to the next carbon dioxide gas storage tank to continue storing carbon dioxide after one carbon dioxide gas storage tank is filled with carbon dioxide.

[0075] A one-way valve is provided in the gas path of the carbon dioxide gas storage tank. The one-way valve can prevent the carbon dioxide gas in the carbon dioxide gas storage tank from flowing back. Therefore, under the action of the compressor, the pressure in the carbon dioxide gas storage tank will gradually rise.

[0076] 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, at the switching input interface, the inlet of the electric sequential switching valve switches to connect to the outlet of the next sequence, and then the carbon dioxide gas extracted by the compressor is stored in 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.

[0077] This design can achieve unattended operation for a long time through the cooperation of the electric sequential switching valve and the gas storage pressure sensor, reduce labor costs, and improve production efficiency.

[0078] The present invention controls the temperature of the flue gas within the temperature range suitable for the best adsorption efficiency of solid amine through a temperature control system, and then utilizes the adsorption and desorption capabilities of solid amine 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.

[0079] Its beneficial effect also lies in that the solid amine adopts the method of temperature-rising desorption, and the heat source for temperature rising 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.

[0080] Its beneficial effect also lies in that the electric sequential switching valve and the gas storage pressure sensor cooperate to solve the technical problem of automatically switching the carbon dioxide gas storage tank, and can achieve unattended continuous automatic operation for a long time, saving labor costs and improving production benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached 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 attached drawings can be obtained based on these attached drawings. Among them:

[0082] Figure 1 is a schematic diagram of a carbon dioxide capture and recovery system;

[0083] Figure 2 is a schematic diagram of the fin and metal pipe structure outside the exchange chamber housing;

[0084] Figure 3 is a schematic diagram of multi-way switching gas storage.

[0085] Symbol description:

[0086] 1. Heat exchanger; 2. Electric control valve; 3. Temperature control device; 4. Temperature measurement sensor; 5. Smoke inlet valve; 6. Housing; 7. Solid amine resin; 8. Smoke exhaust valve; 9. Carbon dioxide gas storage tank; 10. Check valve; 11. Compressor; 12. Electric sequential switching valve; 13. Gas storage pressure sensor; 14. Heating fins; 15. Metal pipe. Specific embodiments

[0087] To make the above objects, features, and advantages of the present utility model more understandable, the following will describe the specific embodiments of the present utility model in detail with reference to the attached drawings of the specification.

[0088] In the following description, many specific details are set forth to fully understand the present utility model. However, the present utility model can also 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.

[0089] Secondly, the present utility model will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present utility model in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general ratio, 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.

[0090] Furthermore, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an independent or selectively exclusive embodiment from other embodiments.

[0091] Refer to Figure 1 As shown, a carbon dioxide capture and recovery system applicable to flue gas includes a solid amine resin 7 for adsorbing carbon dioxide, a pipeline for transporting flue gas, and a carbon dioxide capture system connected to the pipeline;

[0092] The carbon dioxide capture system includes an airtight housing 6 as an exchange chamber, and the exchange chamber is filled with a solid amine resin 7;

[0093] The exchange chamber is provided with a flue gas inlet and a flue gas outlet;

[0094] A valve is provided at the flue gas inlet, which is called the flue gas inlet valve 5. The flue gas inlet valve 5 is connected to the pipeline for transporting flue gas, and a filtering mechanism is also provided before the flue gas inlet valve 5;

[0095] Another valve is provided at the flue gas outlet, which is called the flue gas outlet valve 8. The flue gas outlet valve 8 is connected to the atmosphere;

[0096] It also includes a compressor 11, and the suction port of the compressor 11 is connected to the inner cavity of the exchange chamber;

[0097] The exhaust port of the compressor 11 is connected to a carbon dioxide storage tank 9 through a one-way valve 10.

[0098] In this embodiment, the carbon dioxide capture and recovery system has an exchange chamber, and the exchange chamber has a flue gas inlet and a flue gas outlet for the flow of flue gas. The working process of the carbon dioxide capture and recovery system applicable to flue gas is divided into two stages:

[0099] The first stage is to achieve the adsorption of carbon dioxide: In this stage, the flue gas flows through the exchange chamber, and the solid amine resin 7 adsorbs carbon dioxide in the flue gas. After a certain adsorption time, the solid amine resin 7 reaches saturated adsorption. This stage needs to be maintained for 30 to 45 minutes.

[0100] The second stage is to achieve the desorption and recovery of carbon dioxide: When the adsorption of the solid amine resin 7 reaches saturation, the flue gas inlet valve 5 and the flue gas outlet valve 8 are closed, so that the entire exchange chamber becomes an airtight space. At this time, a compressor 11 connected to the exchange chamber is used to evacuate the exchange chamber, and under the vacuum state, carbon dioxide is released from the solid amine and recovered into the carbon dioxide storage tank 9.

[0101] Through the above two stages, the carbon dioxide in the flue gas is captured, recovered and stored, so as to achieve the goal of carbon neutrality, which has beneficial social benefits.

[0102] Furthermore, it also includes a temperature control system;

[0103] The temperature control system includes a heat exchanger 1, an electric control valve 2 and a temperature control device 3;

[0104] 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.

[0105] The pipeline for conveying flue gas is connected to the heat source inlet of the heat exchanger 1.

[0106] The heat source outlet of the heat exchanger 1 is connected to the flue gas inlet valve 5 of the exchange chamber.

[0107] An external cold source output port is connected to the cold source inlet of the heat exchanger 1 through the electric control valve 2.

[0108] The cold source outlet of the heat exchanger 1 is connected to the external cold source recovery port.

[0109] 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.

[0110] The output interface of the controller is connected to the control port of the electric control valve 2.

[0111] In this embodiment, a temperature control system is arranged between the flue gas conveying pipeline and the solid amine adsorption exchange chamber. The temperature control system includes a heat exchanger 1 and a temperature control device 3, so that the temperature of the flue gas after heat exchange and cooling by the heat exchanger 1 can be maintained within the temperature range required for high solid amine adsorption rate.

[0112] Multiple experiments show that the adsorption capacity of solid amine is 3.85 mmol / g at an adsorption temperature of 55 °C, can reach up to 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.

[0113] Multiple experiments can be summarized as that the best temperature range for adapting the solid amine adsorption rate is 75 °C ± 5 °C.

[0114] Further optimization, the heat exchanger 1 adopts a shell-and-tube flue gas heat exchanger.

[0115] In this embodiment, the heat exchanger 1 is used to cool the flue gas so that the temperature of the flue gas drops to a temperature at which the adsorption rate of the solid amine resin 7 for adsorbing carbon dioxide reaches a relatively high level.

[0116] 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 structure and durability. Choosing the shell-and-tube flue gas heat exchanger, its beneficial effect lies in lower cost and can save construction costs.

[0117] For further optimization, the external cold source adopts a cooling water circulation system.

[0118] In this embodiment, 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, a short construction period, low construction costs, and low usage costs.

[0119] Furthermore, the solid amine adopts a polyethyleneimine material, and the carrier structure of the solid amine adopts an HP2MGL resin structure.

[0120] In this embodiment, polyethyleneimine (PEI) is an amino polymer. Amino polymers have a relatively high amino density (nitrogen content is 33% (w)), and can enable the solid amine to obtain good stability during the adsorption and desorption cycles. Therefore, it is preferentially selected as the amine source.

[0121] In this embodiment, the carrier of the solid amine material should have an appropriate 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, 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.

[0122] 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 carriers such as HP2MGL, D4020, and D3520 with relatively large pore diameters for solid amine materials have a relatively high carbon dioxide adsorption capacity 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 large pore diameter and specific surface area, so the solid amine HP2MGL-50 exhibits the largest carbon dioxide adsorption capacity.

[0123] Refer to Figure 2 As shown, fins are provided on the housing 6 of the exchange chamber, which are called heating fins 14, and the heating fins 14 are arranged in a fin array;

[0124] Holes are provided on the heating fins 14. After the holes on the heating fins 14 are arranged in a fin array, they combine to form a channel, and a metal pipe 15 is arranged in the channel. The metal pipe 15 is connected to the pipe for transporting flue gas through a valve.

[0125] In this embodiment, the desorption of the solid amine is carried out by heating. Fins are arranged on the housing 6 of the exchange chamber. The fins are arranged in an array, and a metal pipe 15 is arranged on the fin array. Flue gas is introduced into the metal pipe 15. The temperature of the flue gas is about 170 to 200 degrees, which can be used to heat the exchange 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.

[0126] Further, both the inlet smoke valve 5 and the exhaust smoke valve 8 are normally open electric control valves 2. The normally open electric control valve 2 has a closing signal port for controlling the valve to close;

[0127] The compressor 11 has a start signal interface for controlling startup;

[0128] It also includes a timing control system;

[0129] The timing control system includes at least two timing control devices, which are respectively called the first timing and the second timing;

[0130] The timing control device includes a timer. After the timer runs to the set duration, the timing control device outputs a control signal through the control output interface;

[0131] The timing control device is also provided with a reset input interface for triggering the timer to re-run. During the operation of the timer, the control output interface closes the output control signal;

[0132] The control output interface of the first timing is connected to the reset input interface of the second timing;

[0133] The control output interface of the second timing is connected to the reset input interface of the first timing;

[0134] The control output interface of the first timing is also respectively connected to the closing signal ports of the inlet smoke valve 5 and the exhaust smoke valve 8;

[0135] The control output interface of the first timing is also connected to the start signal interface of the compressor 11;

[0136] The set duration of the timer of the first timing is 30 - 45 minutes;

[0137] The set duration of the timer of the second timing is 15 - 20 minutes.

[0138] In this embodiment, the adsorption stage and the desorption stage are realized through the timing control system, and the two stages cycle. The beneficial effect is that the efficiency of carbon dioxide adsorption and recovery is improved, and the manual intervention is reduced to save labor costs, thereby improving economic benefits.

[0139] Further, the timer can be either a hardware system or a software system.

[0140] In this embodiment, the timer is used to control the switching of the two working phases of the solid amine. The switching of these two working phases will not affect the entire workflow even if it is advanced or delayed by several minutes. Therefore, the timer does not need to be very precise.

[0141] One way to implement the timer is to utilize the characteristic that it takes a certain amount of time for a capacitor to charge. When the capacitor charges to a threshold value, a reed switch or other switch-type electronic device is used to implement the trigger circuit, triggering another capacitor to start charging, and at the same time outputting an electrical signal as the output control signal. When the charge value of the other capacitor reaches the threshold, the trigger circuit reverses again. While outputting the electrical signal as the output control signal, the first capacitor is charged again. In this way, by using conventional electronic components such as capacitors, resistors, and switch-type electronic devices, the cycle of two timers is realized. This type of timer is simple, reliable, and has a low cost.

[0142] Another way to implement the timer is to utilize the timer built into an intelligent system such as a microprocessor system or a programmable control system, or in combination with the software system running in the intelligent system, to realize the cyclic operation of two timers. The present invention supports the timer implemented in this way so that the corresponding functions can be realized more flexibly by combining hardware or software.

[0143] Further, the filtering mechanism includes a coarse filtering layer and a fine filtering layer;

[0144] The coarse filtering layer uses PP cotton with a minimum filtration of 5 μm;

[0145] The fine filtering layer uses PP cotton with a minimum filtration of 1 μm.

[0146] In this embodiment, a filtering mechanism is provided in front of the smoke inlet valve 5. Its function is to filter the suspended impurities in the flue gas. The clean flue gas can prevent the solid amine resin 7 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.

[0147] 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 ash and has a higher replacement frequency. At this time, the fine filtering layer can still be used.

[0148] If a two-layer structure is not adopted, the side of the filtering layer facing the inlet will accumulate a large amount of ash, while the other side will accumulate very little ash. Replacing them together will cause waste and low economic efficiency.

[0149] Refer to Figure 3As shown, it also includes an electric sequential switching valve 12 and at least two carbon dioxide gas storage tank gas paths;

[0150] The electric sequential switching valve 12 uses a switching valve with one inlet and multiple outlets. The one inlet and multiple outlets are sequentially switched and communicated within the switching valve;

[0151] The electric sequential switching valve 12 also has a switching input interface for controlling and triggering the sequential switching of the passages;

[0152] The carbon dioxide gas storage tank gas path includes a check valve 10 and a carbon dioxide gas storage tank 9. The outlet of the check valve 10 is communicated with the inlet gas path of the carbon dioxide gas storage tank 9;

[0153] The exhaust port of the compressor 11 is communicated with the inlet of the electric sequential switching valve 12;

[0154] The multiple outlets of the electric sequential switching valve 12 are sequentially communicated with the inlets of the respective check valves 10;

[0155] A pressure sensor, called a gas storage pressure sensor, is also provided in the gas path pipe connecting the electric sequential switching valve 12 and the check valve 10. The gas storage pressure sensor is a pressure sensor with a preset pressure value and outputs an overpressure signal when the gas path pipe pressure exceeds the preset pressure value;

[0156] The overpressure signal output interface of the gas storage pressure sensor is signal - communicated with the switching input interface of the electric sequential switching valve 12.

[0157] The present invention utilizes the solid - state amine resin 7 to realize the adsorption and desorption recovery of carbon dioxide gas, cycling between adsorption and desorption. Therefore, it is time - consuming, labor - intensive and inefficient to manually monitor the pressure of the carbon dioxide gas storage tank 9 and replace the carbon dioxide gas storage tank 9.

[0158] This design introduces the electric sequential switching valve 12, which can automatically switch to the next carbon dioxide gas storage tank 9 to continue storing carbon dioxide after one carbon dioxide gas storage tank 9 is full of carbon dioxide.

[0159] A check valve 10 is provided in the carbon dioxide gas storage tank gas path. The check valve 10 can prevent the carbon dioxide gas in the carbon dioxide gas storage tank 9 from flowing back. Therefore, under the action of the compressor 11, the pressure in the carbon dioxide gas storage tank 9 will gradually increase.

[0160] The function of the gas storage pressure sensor is to detect the air pressure in the carbon dioxide gas storage tank 9. 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 12. After receiving the overpressure signal, the inlet of the electric sequential switching valve 12 switches to communicate with the outlet of the next sequence, and then the carbon dioxide gas extracted by the compressor 11 is stored in another empty carbon dioxide gas storage tank 9. The originally overpressurized outlet communicates with the atmosphere, and the high pressure in the gas pipeline between the one-way valve 10 and the electric sequential switching valve 12 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.

[0161] Through the cooperation of the electric sequential switching valve 12 and the gas storage pressure sensor, this design can achieve unattended operation for a long time, reduce labor costs, and improve production efficiency.

[0162] In addition, to provide a concise description of 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.

[0163] 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 ordinary technical personnel who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine work of design, manufacturing, and production.

[0164] 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 within the scope of the claims of the present invention.

Claims

1. A carbon dioxide capture and recovery system applicable to flue gas, including a solid amine resin for adsorbing carbon dioxide, characterized in that, It also includes a pipeline for transporting flue gas and a carbon dioxide capture system connected to the pipeline; The carbon dioxide capture system includes an airtight housing as an exchange chamber, and the exchange chamber is filled with solid amine resin; The exchange 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 valve is connected to the pipeline for transporting flue gas, 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 valve is connected to the atmosphere; It also includes a compressor, and the suction port of the compressor is connected to the inner cavity of the exchange chamber; The exhaust port of the compressor is connected to a carbon dioxide storage tank through a one-way valve.

2. The carbon dioxide capture and recovery system applicable to flue gas according to claim 1, characterized in that, It also includes a temperature control system; The temperature control system includes a heat exchanger, an electrically controlled 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 electrically controlled valve; 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 valve of the exchange chamber; An external cold source output port is connected to the cold source inlet of the heat exchanger through an electrically controlled 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 electrically controlled valve.

3. The carbon dioxide capture and recovery system applicable to flue gas according to claim 2, wherein The heat exchanger adopts a shell-and-tube flue gas heat exchanger.

4. The carbon dioxide capture and recovery system applicable to flue gas according to claim 2, wherein The external cold source adopts a cooling water circulation system.

5. The carbon dioxide capture and recovery system applicable to flue gas according to claim 1, characterized in that The solid amine is made of polyethyleneimine, and the carrier structure of the solid amine adopts an HP2MGL resin structure.

6. The carbon dioxide capture and recovery system applicable to flue gas according to claim 1, wherein, Fins are arranged on the housing of the exchange chamber, which are called heating fins, and the heating fins are arranged in a fin array; Holes are arranged 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 metal pipeline is arranged in the channel. The metal pipeline is connected to the pipeline for transporting flue gas through a valve.

7. The carbon dioxide capture and recovery system applicable to flue gas according to claim 1, wherein Both the flue gas inlet valve and the flue gas outlet valve adopt normally open electrically controlled valves, and the normally open electrically controlled valves have a closing signal port for controlling the valve to close; The compressor has a start signal interface for controlling startup; It also includes a timing control system; The timing control system includes at least two timing control devices, which are called the first timing and the second timing respectively; The timing control device includes a timer. After the timer runs to the set duration, the timing control device outputs a control signal through the control output interface; The timing control device is also provided with a reset input interface for triggering the timer to re-run. During the operation of the timer, the control output interface closes the output control signal; The control output interface of the first timing is connected to the reset input interface of the second timing; The control output interface of the second timing is connected to the reset input interface of the first timing; The control output interface of the first timing is also respectively connected to the closing signal ports of the flue gas inlet valve and the flue gas outlet valve; The control output interface of the first timing is also connected to the start signal interface of the compressor; The set duration of the timer of the first timing is 30 - 45 minutes; The set duration of the timer of the second timing is 15 - 20 minutes.

8. The carbon dioxide capture and recovery system applicable to flue gas according to claim 1, characterized in that, The filtering mechanism includes a coarse filter layer and a fine filter layer; The coarse filter layer uses PP cotton with a minimum filtration of 5 μm; The fine filter layer uses PP cotton with a minimum filtration of 1 μm.

9. The carbon dioxide capture and recovery system applicable to flue gas according to claim 1, wherein It also includes an electric sequential switching valve and at least two carbon dioxide gas storage tank gas paths; 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; The electric sequential switching valve also has a switching input interface for controlling the sequential switching of the trigger path; The carbon dioxide gas storage tank gas path includes a one-way valve and a carbon dioxide gas storage tank. The outlet of the one-way valve is connected to the inlet gas path of the carbon dioxide gas storage tank; The exhaust port of the compressor is connected to the inlet of the electric sequential switching valve; The multiple outlets of the electric sequential switching valve are sequentially connected to the inlets of each one-way valve; A pressure sensor, called the gas storage pressure sensor, is also provided in the gas path pipeline connecting the electric sequential switching valve and the one-way valve. The gas storage pressure sensor uses a pressure sensor with a preset pressure value and outputs an overpressure signal when the gas path pipeline pressure exceeds the preset pressure value; The overpressure signal output interface of the gas storage pressure sensor is signal-connected to the switching input interface of the electric sequential switching valve.

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