Internal carbon recycling system and industrial decarbonization method

Abstract

This invention discloses an internal carbon cycle system and an industrial decarbonization method. The internal carbon cycle system consists of two gas storage tanks connected to a four-way valve via a shut-off valve and a check valve, respectively. The output port of the four-way valve is sequentially connected to a gas drying device, a flow limiting valve, a heat exchanger, a heating furnace reactor, and the second inlet of the heat exchanger. The second output port of the heat exchanger is sequentially connected to a heat storage device and the inlet of a three-way valve. The first output port of the three-way valve is connected to a first gate valve. The second output port of the three-way valve is sequentially connected to a gate valve and a differential pressure swing adsorption device. The first output port of the differential pressure swing adsorption device discharges CO, which is input into a subsequent treatment device. The second output port of the differential pressure swing adsorption device is connected to the inlet of a pressurization device. The output port of the pressurization device is sequentially connected to a third gate valve and the third inlet of the four-way valve. The industrial decarbonization method uses two alternating steps of perovskite thermal reduction and thermal oxidation, enabling the system to continuously decarbonize emitted carbon dioxide through internal carbon cycle.

Description

Technical Field

[0001] This invention belongs to the field of chemical decarbonization technology, specifically relating to an internal carbon cycle system and an industrial decarbonization method and system. Background Technology

[0002] China is the world's largest producer and consumer of cement, accounting for more than half of global consumption. From a carbon emission perspective, the cement industry accounts for about 13% of the country's total carbon emissions, second only to the power and steel industries. Among these emissions, process emissions are the biggest challenge for the cement industry in reducing emissions. About 60% of the carbon emissions during cement production come from carbon dioxide produced by the decomposition of carbonates. Therefore, reducing emissions in the cement industry is crucial to achieving my country's "dual carbon" goals.

[0003] The persistent large-scale carbon emissions pose the biggest challenge to the cement and coal-fired power generation industries on their path to carbon neutrality. Currently, there are several decarbonization pathways applicable to these industries, including using alternative fuels to replace fossil fuels, improving energy efficiency, or implementing carbon capture. However, these methods impose significant cost burdens on businesses. Therefore, a simple, efficient, and applicable decarbonization system for the cement industry is urgently needed. If the carbon dioxide generated during cement and coal-fired power generation can be reused locally after a series of treatments, carbon emissions will be reduced, including direct carbon dioxide emissions and costs such as "carbon taxes." Furthermore, the increased costs associated with decarbonization, storage, and transportation will be offset, thereby creating economic benefits beyond production. Summary of the Invention

[0004] The purpose of this invention is to address some shortcomings of the existing technology and provide an internal carbon cycle system and an industrial decarbonization method. This system decomposes carbon dioxide into carbon monoxide and oxygen by setting up heat exchangers and reactors for heating and cooling, realizing decarbonization energy storage technology that can be applied to the cement or coal-fired power generation industry.

[0005] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows:

[0006] An internal carbon circulation system includes two gas storage tanks, a shut-off valve, a gate valve, a three-way valve, a four-way valve, a flow control valve, a heat exchanger, a gas drying device, a heating furnace reactor, a heat storage device, a differential pressure swing adsorption device, and a pressurization device. The system is characterized in that: the two gas storage tanks are respectively connected to the first and second inlets of the four-way valve via a shut-off valve; one outlet of the four-way valve is sequentially connected to the gas drying device, the flow control valve, and the first inlet of the heat exchanger; the first outlet of the heat exchanger is connected to the inlet of the heating furnace reactor; the outlet of the heating furnace reactor is connected to the second inlet of the heat exchanger; the second outlet of the heat exchanger is sequentially connected to the heat storage device and the inlet of the three-way valve; the first outlet of the three-way valve is connected to the first gate valve; the second outlet of the three-way valve is sequentially connected to the second gate valve and the differential pressure swing adsorption device; the first outlet of the differential pressure swing adsorption device discharges CO, which is input to a subsequent treatment device; the second outlet of the differential pressure swing adsorption device is connected to the inlet of the pressurization device; and the outlet of the pressurization device is sequentially connected to the third gate valve and the third inlet of the four-way valve.

[0007] Two gas storage tanks provide storage for two different gases: carbon dioxide and nitrogen. Shut-off valves control gas flow rate and on / off conditions. Gate valves control the flow of both gases. Three-way and four-way valves provide three and four inlets / outlets respectively. Flow control valves control the upper limit of flow in the pipeline. Heat exchangers heat lower-temperature gases and cool higher-temperature gases. Gas drying devices dry the gases. A heating furnace reactor heats the reactants and provides a reaction site. A heat storage device stores the thermal energy of high-temperature gases for later use. A differential pressure swing adsorption device effectively separates carbon monoxide and carbon dioxide. A pressurization device pressurizes recovered CO2 gas and reintroduces it into the loop. Gate valves are installed at both ends of the output after the three-way valve to allow different types of output gases to be discharged from different pipelines.

[0008] The invention also includes an intelligent controller, which is a microcomputer system designed according to technical requirements to intelligently set and adjust the peripheral controlled components and issue control commands. The intelligent controller is connected to shut-off valves, gate valves, three-way valves, four-way valves, gas drying devices, flow limiting valves, heat exchangers, heating furnace reactors, heat storage devices, differential pressure swing adsorption devices, and pressurization devices.

[0009] The invention also includes a pressure regulating device, which is installed between the first outlet of the heat exchanger and the inlet of the heating furnace reactor. An intelligent controller is connected to the pressure regulating device. The pressure regulating device regulates the pressure of the input N2 or CO2 gas before it enters the heating furnace reactor.

[0010] The present invention also includes four check valves. Two check valves are respectively connected between the first and second inlets of the two shut-off valves and the four-way valve. The other two check valves are respectively connected between the differential pressure swing adsorption device and the second gate valve and between the third gate valve and the third inlet of the four-way valve. The check valves prevent the reaction gas from flowing back into the gas storage tank or the main pipeline.

[0011] The invention also includes a flow indicator and four temperature indicators. The flow indicator is installed between the flow limiting valve and the first inlet of the heat exchanger. The four temperature indicators are respectively installed on the pipelines of the two inlets and two outlets of the heat exchanger. The intelligent controller is connected to the flow indicator and the four temperature indicators respectively. The controller is used to monitor relevant flow parameters in the pipeline. The temperature indicators are used to monitor relevant temperature parameters in the pipeline.

[0012] An industrial decarbonization method for an internal carbon cycle system, comprising two gas storage tanks containing carbon dioxide and nitrogen respectively, and a heating furnace reactor filled with perovskite, characterized by including two steps: a thermal reduction step of perovskite and a thermal oxidation step of perovskite, and the two steps are used alternately in a cycle, so that the system continuously achieves internal carbon cycle decarbonization of emitted carbon dioxide.

[0013] The specific steps of the thermal reduction of perovskite are as follows: the shut-off valve in the CO2 pipeline is closed to ensure that only N2 is used as the sole gas input for this step; after the N2 gas flows through the shut-off valve, check valve, four-way valve, gas drying device, and flow control valve, it enters the heat exchanger and then directly or through the pressure regulating device into the heating furnace reactor, and then enters the heat exchanger again for cooling; after the mixed gas flows out of the heat exchanger, it passes through the heat storage device and the three-way valve, and then the O2 and N2 mixed gas is discharged from the first gate valve connected to the first output port of the three-way valve.

[0014] The specific steps of the thermal oxidation of the perovskite are as follows: by closing the shut-off valve in the N2 pipeline, only CO2 is used as the sole gas input for this step. After the CO2 gas flows through the shut-off valve, check valve, four-way valve, gas drying device, and flow control valve, it enters the heat exchanger and then directly or through the pressure regulating device into the heating furnace reactor. It then enters the heat exchanger again for cooling. After the mixed gas flows out of the heat exchanger, it passes through the heat storage device, three-way valve, and second gate valve. Then, the CO gas and CO2 gas are separated by the differential pressure swing adsorption device. The CO gas is directly discharged to the subsequent processing device, while the CO2 gas passes through the pressurization device, third gate valve, and check valve in sequence before re-entering the four-way valve.

[0015] The invention also includes a flow indicator and four temperature indicators. The flow indicator is installed between the flow limiting valve and the first inlet of the heat exchanger. The flow indicator is used to monitor relevant flow parameters in the pipeline, allowing on-site personnel to monitor the real-time flow of the input gas. The four temperature indicators are respectively installed on the pipelines of the two inlets and two outlets of the heat exchanger. The intelligent controller is connected to the flow indicator and the four temperature indicators respectively. The temperature indicators are used to monitor relevant temperature parameters in the pipeline, allowing on-site personnel to monitor the temperature before and after heating or cooling.

[0016] In the thermal reduction step of the perovskite, the reduction temperature of the perovskite in the heating furnace reactor is 650-750°C.

[0017] In the thermal oxidation step of the perovskite, the perovskite oxidation temperature in the heating furnace reactor is 750-850°C.

[0018] The beneficial effects of this invention are:

[0019] 1. The system of the present invention can effectively crack CO2, realize industrial decarbonization of carbon cycle within the system. This system only outputs O2, N2 and CO gas, and does not output CO2 gas that pollutes the environment, realizing decarbonization energy storage technology in the cement or coal-fired power generation industry.

[0020] 2. The industrial decarbonization method of the present invention does not require the redesign, manufacture and installation of the entire factory facilities. It only requires connecting the system of the present invention to the CO2 emission outlet. In this way, while achieving zero carbon emissions, it also improves the economic benefits of the entire industrial chain.

[0021] 3. The heat exchanger of the present invention can save a lot of energy loss caused by the continuous heating and cooling of the gas. Part of the heat absorbed by the gas when it first passes through the heat exchanger comes from the heat released when the gas cools down when it passes through the heat exchanger a second time. In this way, not only is the heating efficiency of the system improved, but energy is also saved.

[0022] 4. In this invention, the reactants need to be heated to nearly 700 degrees Celsius in the core heating furnace reactor. Therefore, preheating the gas through a heat exchanger before it enters the reactor can greatly improve the reaction efficiency and avoid the phenomenon of incomplete reaction caused by direct heating in the heating furnace reactor. Attached Figure Description

[0023] Figure 1 This is a connection diagram of an internal carbon recycling system according to one embodiment of the present invention.

[0024] Figure 2 This is a connection diagram of an internal carbon recycling system according to Embodiment 2 of the present invention.

[0025] Figure 3 This is a schematic diagram of the connection arrangement of an internal carbon cycle system according to Embodiment 3 of the present invention.

[0026] Figure 4 This is a schematic diagram of the perovskite thermal reduction step in an internal carbon circulation system of the present invention.

[0027] Figure 5 This is a schematic diagram of the perovskite thermal oxidation steps in an internal carbon circulation system according to the present invention.

[0028] In the attached diagram, 1 is an N2 storage tank, 2 is a first shut-off valve, 3 is a first check valve, 4 is a CO2 storage tank, 5 is a second shut-off valve, 6 is a second check valve, 7 is a four-way valve, 8 is a gas drying device, 9 is a flow control valve, 10 is a heat exchanger, 11 is a heating furnace reactor, 12 is a heat storage device, 13 is a three-way valve, 14 is a first gate valve, 15 is a second gate valve, 16 is a third check valve, 17 is a differential pressure swing adsorption device, 18 is a pressurization device, 19 is a third gate valve, 20 is a fourth check valve, 21 is a pressure regulating device, 31 is a flow indicator, 32 is a first temperature indicator, 33 is a second temperature indicator, 34 is a third temperature indicator, and 35 is a fourth temperature indicator. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings. However, before describing the present invention in detail, it should be understood that the present invention is not limited to the specific embodiments described. It should also be understood that the terminology used herein is only for describing specific embodiments and is not intended to limit the present invention. The heat exchanger, gas drying device, heating furnace reactor, heat storage device, pressure differential swing adsorption device, pressurization device, and pressure regulation device used in the present invention are all existing structures and can be directly purchased. The heating furnace reactor is filled with perovskite.

[0030] Example 1:

[0031] like Figure 1As shown, an internal carbon circulation system includes two gas storage tanks (1, 4), two shut-off valves (2, 5), four check valves (3, 6, 16, 20), one flow indicator 31, four temperature indicators (32, 33, 34, 35), three gate valves (14, 15, 19), a three-way valve 13, a four-way valve 7, a gas drying device 8, a flow limiting valve 9, a heat exchanger 10, a heating furnace reactor 11, a heat storage device 12, a differential pressure swing adsorption device 17, and a pressurization device 18. The system is characterized in that: the N2 storage tank 1 is connected to the first inlet of the four-way valve 7 via the first shut-off valve 2 and the first check valve 3. CO2 storage tank 4 is connected to the second inlet of four-way valve 7 via second shut-off valve 5 and second check valve 6. One outlet of four-way valve 7 is sequentially connected to gas drying device 8, flow limiting valve 9, and first inlet of heat exchanger 10. A flow indicator 31 is installed between flow limiting valve 9 and first inlet of heat exchanger 10. The first outlet of heat exchanger 10 is connected to inlet of heating furnace reactor 11. The outlet of heating furnace reactor 11 is connected to the second inlet of heat exchanger 10. The second outlet of heat exchanger 10 is sequentially connected to heat storage device 12 and inlet of three-way valve 13. The first outlet of three-way valve 13... The first gate valve 14 is connected to the first outlet of the three-way valve 13. The second outlet of the three-way valve 13 is connected in sequence to the second gate valve 15, the third check valve 16, and the differential pressure swing adsorption device 17. The first outlet of the differential pressure swing adsorption device 17 discharges CO, and the CO gas is input into the subsequent treatment device. The second outlet of the differential pressure swing adsorption device 17 is connected to the inlet of the booster device 18. The outlet of the booster device 18 is connected in sequence to the third gate valve 19, the fourth check valve 20, and the third inlet of the four-way valve 7. Four temperature indicators (32, 33, 34, 35) are respectively installed on the pipelines of the two inlets and two outlets of the heat exchanger 10.

[0032] Example 2:

[0033] like Figure 2 As shown, based on Embodiment 1, the present invention adds a pressure regulating device 21, which is installed between the first output port of the heat exchanger 10 and the input port of the heating furnace reactor 11. The pressure regulating device 21 regulates the pressure of the input N2 or CO2 gas before it enters the heating furnace reactor 11.

[0034] Example 3:

[0035] like Figure 3As shown, based on Embodiment 2, this invention adds an intelligent controller, which is a microcomputer system. The system, programmed according to technical requirements, intelligently sets and adjusts the peripheral controlled components and issues control commands accordingly. The intelligent controller is connected to two shut-off valves (2, 5), three gate valves (14, 15, 19), a three-way valve 13, a four-way valve 7, a gas drying device 8, a flow limiting valve 9, a heat exchanger 10, a heating furnace reactor 11, a heat storage device 12, a differential pressure swing adsorption device 17, a pressurizing device 18, and a pressure regulating device 21. The intelligent controller controls all of the above components. Each component has bidirectional communication functionality with the intelligent controller regarding its operating parameters and status, and each component receives control commands from the intelligent controller to perform operational actions. These operations include: setting its operation, start-up, and stop parameters; monitoring its operating status parameters online; and automatically controlling its operational actions.

[0036] like Figure 1 , Figure 4 , Figure 5 As shown, an industrial decarbonization method for an internal carbon cycle system includes two gas storage tanks containing carbon dioxide and nitrogen respectively, and a heating furnace reactor filled with perovskite. The method is characterized by two steps: a thermal reduction step of perovskite and a thermal oxidation step of perovskite, and the two steps are used alternately in a cycle, so that the system continuously decarbonizes carbon dioxide emitted from the cement or coal-fired power generation industry through internal carbon cycle.

[0037] The thermal reduction step of the perovskite is specifically as follows: the thermal reduction step of the perovskite is specifically as follows: by closing the shut-off valve in the CO2 pipeline, only N2 is used as the sole gas input for this step; after the N2 gas flows through the shut-off valve, check valve, four-way valve, gas drying device, and flow control valve, it enters the heat exchanger and then the heating furnace reactor, and then enters the heat exchanger again for cooling; after the mixed gas flows out of the heat exchanger, it passes through the heat storage device and the three-way valve, and then the O2 and N2 mixed gas is discharged from the first gate valve connected to the first output port of the three-way valve;

[0038] The thermal oxidation step of the perovskite is specifically as follows: by closing the shut-off valve in the N2 pipeline, only CO2 is used as the sole gas input for this step. After the CO2 gas flows through the shut-off valve, check valve, four-way valve, gas drying device, and flow control valve, it enters the heat exchanger and then the heating furnace reactor. It then enters the heat exchanger again for cooling. After the mixed gas flows out of the heat exchanger, it passes through the heat storage device, three-way valve, and second gate valve. Then, the CO gas and CO2 gas are separated by the differential pressure swing adsorption device. The CO gas is directly discharged to the subsequent processing device, while the CO2 gas passes through the pressurization device, third gate valve, and check valve in sequence before re-entering the four-way valve.

[0039] like Figure 1 , Figure 4 As shown, the thermal reduction step of the perovskite is as follows: the first shut-off valve 2 in the pipeline of N2 storage tank 1 is opened, and the second shut-off valve 5 in the pipeline of CO2 storage tank 4 is closed. The first check valve 3 and the second check valve 6 in these two pipelines prevent subsequent gas from flowing back into N2 storage tank 1 or CO2 storage tank 4. The main function of N2 through the subsequent pipeline is to carry out the O2 formed by the reduction of perovskite in the heating furnace reactor 11. After passing through the four-way valve 7, N2 flows through the gas drying device 8 to dry the gas. Before flowing through the heat exchanger 10, a flow indicator 31 and a first temperature indicator 32 are connected to monitor the temperature before entering the heat exchanger 10 and the flow rate in the main pipeline, so as to adjust the gas flow rate in the pipeline. After N2 passes through the heat exchanger 10 and is connected to the second temperature indicator 33, it enters the tubular heating furnace reactor 11. The reduction temperature of perovskite in the heating furnace reactor 11 is about 700°C; of course, it can also... Before N2 enters the tubular heating furnace reactor 11, it first enters the pressure regulating device 21 to pressurize the input N2 gas before entering the heating furnace reactor 11. At the same time, the O2 formed by the high-temperature cracking of perovskite in the heating furnace reactor 11 is carried out and then cooled again by the heat exchanger 10. Before and after passing through the heat exchanger 10, the N2 and O2 mixed gas will pass through the third temperature indicator 34 and the fourth temperature indicator 35 to monitor the temperature before and after cooling so as to make adjustments. Then, the N2 and O2 mixed gas will pass through the heat storage device 12 to store some heat, and at the same time, it can also cool the N2 and O2 mixed gas. Then, the N2 and O2 mixed gas will be discharged through the lower outlet of the three-way valve 13 and the first gate valve 14 in sequence. At this time, the second gate valve 15 after the left outlet of the three-way valve 13 is closed, and the N2 and O2 mixed gas will not flow into the differential pressure swing adsorption device 17 through the second gate valve 15.

[0040] like Figure 1 , Figure 5As shown, the thermal oxidation step of the perovskite is as follows: the first shut-off valve 2 in the pipeline of N2 storage tank 1 is closed, and the second shut-off valve 5 in the pipeline of CO2 storage tank 4 is opened. The first check valve 3 and the second check valve 6 in these two pipelines prevent subsequent gas from flowing back into N2 storage tank 1 or CO2 storage tank 4. CO2 flows through the four-way valve 7 and then through the gas drying device 8 to dry the gas. Before flowing through the heat exchanger 10, a flow indicator 31 and a first temperature indicator 32 are connected to monitor the temperature before entering the heat exchanger 10 and the flow rate in the main pipeline, so as to adjust the gas flow rate in the pipeline. After CO2 passes through the heat exchanger 10 and is connected to the second temperature indicator 33, it enters the tubular heating furnace reactor 11. The perovskite oxidation temperature in the heating furnace reactor is about 800°C. Alternatively, before CO2 enters the tubular heating furnace reactor 11, it can first enter the pressure regulating device 21 to pressurize the input CO2 gas before entering the heating furnace reactor 11. At the same time, it enters the heating furnace reactor 11 and reacts with the perovskite to form CO and CO2. After the CO and CO2 mixture passes through heat exchanger 10 for cooling, it passes through third temperature indicator 34 and fourth temperature indicator 35 before and after passing through heat exchanger 10 to monitor the temperature before and after cooling and make adjustments. Then, the CO and CO2 mixture passes through heat storage device 12 to store some heat and also cool the CO and CO2 mixture. Then, the CO and CO2 mixture passes through the left outlet of three-way valve 13, second gate valve 15 and third check valve 16 in sequence before entering differential pressure swing adsorption device 17. At this time, the first gate valve 14 after the lower outlet of three-way valve 13 will be closed to prevent the CO and CO2 mixture from flowing directly out of the system. After passing through differential pressure swing adsorption device 17, the CO and CO2 mixture will separate into CO gas and CO2 gas. CO gas is discharged from the system for subsequent processing devices, while CO2 gas will pass through pressurization device 18, third gate valve 19, fourth check valve 20 and four-way valve 7 in sequence to re-enter the loop for reuse.

[0041] To improve its decarbonization capacity and efficiency, two or more internal carbon cycle systems are used in parallel for decarbonization.

[0042] This invention achieves industrial decarbonization of the internal carbon cycle system by continuously switching between two steps. In the first step of this system, namely the thermal reduction step of perovskite, the reaction temperature is about 700°C, while in the second step of this system, namely the thermal oxidation step of perovskite, the reaction temperature is about 800°C. Therefore, when switching back and forth between the two different steps, it is necessary to adjust the temperature of the tubular heating furnace reactor in a timely manner to achieve the corresponding reaction temperature.

[0043] When the system switches from the thermal oxidation step of perovskite back to the thermal reduction step of perovskite, the second shut-off valve 5, the third gate valve 19, and the differential pressure swing adsorption device 17 are closed simultaneously to prevent small amounts of CO gas and CO2 gas in the pipeline from participating in subsequent reactions.

[0044] Reaction Principle: The two-step thermochemical reaction mainly consists of two reactions. The third redox substance involved in this reaction is perovskite, with the general formula ABO3. Perovskite has excellent comprehensive properties, including its low cost, high yield, and lower reaction temperature compared to other metal oxides. When the reactants are at a reaction temperature of 700°C, the perovskite reduction reaction occurs, as shown in formula (1). At this time, oxygen atoms will overflow from its crystal structure to form oxygen gas, and oxygen vacancies will also be formed in the structure.

[0045] (1)

[0046] in, The degree is not stoichiometric. When the ambient temperature is 800°C, the perovskite oxidation reaction occurs, as shown in formula (2). At this time, the reduced perovskite will take oxygen atoms from the CO2 feedstock to generate CO, while restoring itself to its initial state. Theoretically, the perovskite, as a catalyst, is continuously recycled throughout the process, so the overall reaction process can be understood as CO2 decomposing into CO and O2.

[0047] (2)

[0048] Online monitoring and automatic control mechanisms can also be set up in the system, such as... Figure 3 As shown, purchase an intelligent controller, which is connected to two shut-off valves (2, 5), three gate valves (14, 15, 19), three-way valve 13, four-way valve 7, gas drying device 8, flow limiting valve 9, heat exchanger 10, heating furnace reactor 11, heat storage device 12, differential pressure swing adsorption device 17, pressurization device 18, and pressure regulation device 21. The specific control is as follows: In the first step of an industrial decarbonization method using an internal carbon cycle system, namely the thermal reduction step of perovskite, the flow indicator 31 after the flow limiting valve 9 monitors the flow rate in the main pipeline in real time. If the flow indicator 31 shows that the flow rate is too high, the O2 concentration produced by the perovskite in the heating furnace reactor 11 is too low, and the production efficiency is not high. Therefore, the intelligent controller adjusts the first shut-off valve 2 to reduce the N2 flow rate in the pipeline, thereby reducing the flow rate in the main pipeline. If the flow indicator 31 shows that the flow rate is too low, the O2 concentration around the perovskite in the heating furnace reactor 11 is too high, which will cause the reactants to re-oxidize at high temperature, thereby reducing the efficiency of the system. Therefore, the intelligent controller adjusts the first shut-off valve 2 to increase the N2 flow rate in the pipeline, thereby increasing the flow rate in the main pipeline.

[0049] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and modifications can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein designs specific methods and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to other methods and applications having the same function.

[0050] 1. The system of the present invention can effectively crack CO2, realize industrial decarbonization of carbon cycle within the system. This system only outputs O2, N2 and CO gas, and does not output CO2 gas that pollutes the environment, realizing decarbonization energy storage technology in the cement or coal-fired power generation industry.

[0051] 2. The industrial decarbonization method of the present invention does not require the redesign, manufacture and installation of the entire factory facilities. It only requires connecting the system of the present invention to the CO2 emission outlet. In this way, while achieving zero carbon emissions, it also improves the economic benefits of the entire industrial chain.

[0052] 3. The heat exchanger of the present invention can save a lot of energy loss caused by the continuous heating and cooling of the gas. Part of the heat absorbed by the gas when it first passes through the heat exchanger comes from the heat released when the gas cools down when it passes through the heat exchanger a second time. In this way, not only is the heating efficiency of the system improved, but energy is also saved.

[0053] 4. In this invention, the reactants need to be heated to nearly 700 degrees Celsius in the core heating furnace reactor. Therefore, preheating the gas through a heat exchanger before it enters the reactor can greatly improve the reaction efficiency and avoid the phenomenon of incomplete reaction caused by direct heating in the heating furnace reactor.

Claims

1. An internal carbon cycle system comprising two gas storage tanks, stop valves, gate valves, three-way valves, four-way valves, flow restriction valves, heat exchangers, gas drying devices, heating furnace reactors, heat storage devices, pressure swing adsorption devices, and pressure increasing devices, characterized in that: Two gas storage tanks are connected to the first and second inlets of a four-way valve via a shut-off valve. One outlet of the four-way valve is connected in sequence to a gas drying device, a flow limiting valve, and the first inlet of a heat exchanger. The first outlet of the heat exchanger is connected to the inlet of a heating furnace reactor. The outlet of the heating furnace reactor is connected to the second inlet of the heat exchanger. The second outlet of the heat exchanger is connected in sequence to a heat storage device and the inlet of a three-way valve. The first outlet of the three-way valve is connected to a first gate valve. The second outlet of the three-way valve is connected in sequence to a second gate valve and a differential pressure swing adsorption device. The first outlet of the differential pressure swing adsorption device discharges CO, which is input into a subsequent treatment device. The second outlet of the differential pressure swing adsorption device is connected to the inlet of a booster device. The outlet of the booster device is connected in sequence to a third gate valve and the third inlet of the four-way valve.

2. The internal carbon cycle system according to claim 1, characterized in that: It also includes intelligent controllers, which are connected to shut-off valves, gate valves, gas drying devices, flow limiting valves, heat exchangers, heating furnace reactors, heat storage devices, differential pressure swing adsorption devices, and pressurization devices.

3. An internal carbon recycling system according to claim 2, characterized in that: It also includes a pressure regulating device, which is installed between the first outlet of the heat exchanger and the inlet of the heating furnace reactor. The intelligent controller is connected to the pressure regulating device.

4. An internal carbon recycling system according to claim 1, 2 or 3, characterized in that: It also includes four check valves. Two check valves are connected between the first and second inlets of the two gate valves and the four-way valve, respectively. The other two check valves are connected between the differential pressure swing adsorption device and the second gate valve, and between the third gate valve and the third inlet of the four-way valve, respectively.

5. An internal carbon recycling system according to claim 4, characterized in that: It also includes a flow indicator and four temperature indicators. The flow indicator is installed between the flow limiting valve and the first inlet of the heat exchanger; the four temperature indicators are installed on the pipelines of the two inlets and two outlets of the heat exchanger, respectively. The intelligent controller is connected to the flow indicator and the four temperature indicators.

6. An industrial decarbonization method for an internal carbon cycle system according to claim 4, wherein two gas storage tanks are respectively filled with carbon dioxide and nitrogen, and the heating furnace reactor is filled with perovskite, characterized in that... It includes two steps: one is the thermal reduction step of perovskite, and the other is the thermal oxidation step of perovskite. The two steps are used alternately in a cycle, so that the system can continuously achieve internal carbon cycle decarbonization of emitted carbon dioxide. The specific steps of the thermal reduction of perovskite are as follows: the shut-off valve in the CO2 pipeline is closed to ensure that only N2 is used as the sole gas input for this step; after the N2 gas flows through the shut-off valve, check valve, four-way valve, gas drying device, and flow control valve, it enters the heat exchanger and then directly or through the pressure regulating device into the heating furnace reactor, and then enters the heat exchanger again for cooling; after the mixed gas flows out of the heat exchanger, it passes through the heat storage device and the three-way valve, and then the O2 and N2 mixed gas is discharged from the first gate valve connected to the first output port of the three-way valve. The specific steps of the thermal oxidation of the perovskite are as follows: by closing the shut-off valve in the N2 pipeline, only CO2 is used as the sole gas input for this step. After the CO2 gas flows through the shut-off valve, check valve, four-way valve, gas drying device, and flow control valve, it enters the heat exchanger and then directly or through the pressure regulating device into the heating furnace reactor. It then enters the heat exchanger again for cooling. After the mixed gas flows out of the heat exchanger, it passes through the heat storage device, three-way valve, and second gate valve. Then, the CO gas and CO2 gas are separated by the differential pressure swing adsorption device. The CO gas is directly discharged to the subsequent processing device, while the CO2 gas passes through the pressurization device, third gate valve, and check valve in sequence before re-entering the four-way valve.

7. An industrial decarbonization method of an internal carbon cycle system according to claim 6, characterized by: It also includes a flow indicator and four temperature indicators. The flow indicator is installed between the flow limiting valve and the first inlet of the heat exchanger; the four temperature indicators are respectively installed on the pipelines of the two inlets and two outlets of the heat exchanger. The intelligent controller is connected to the flow indicator and the four temperature indicators.

8. An industrial decarbonization method of an internal carbon cycle system according to claim 6, characterized by: In the thermal reduction step of the perovskite, the reduction temperature of the perovskite in the heating furnace reactor is 650-750℃.

9. An industrial decarbonization method of an internal carbon cycle system according to claim 6, characterized by: In the thermal oxidation step of the perovskite, the perovskite oxidation temperature in the heating furnace reactor is 750-850℃.

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