Direct air carbon capture and concrete mineralization maintenance coupling system

Abstract

The invention provides a direct air carbon capture and concrete mineralization maintenance coupling system which comprises a direct air carbon capture device, a concrete mineralization maintenance device and a fan, and the fan provides stable airflow for the direct air carbon capture device for CO2 adsorption. A path of high-pressure steam is led out by the concrete mineralization curing device to perform CO2 desorption on the direct air carbon capture device, and the direct air carbon capture device is provided with a first gas path for conveying desorbed CO2 to the concrete mineralization curing device. The steam utilization efficiency of a CO2 mineralization curing concrete technology is improved, and the technical cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of direct air carbon capture, in particular to a direct air carbon capture and concrete mineralization curing coupling system. Background Art

[0002] Direct air carbon capture (DAC) is a distributed carbon capture technology that can be widely used without geographical restrictions and is one of the most promising negative carbon technologies. The current mainstream DAC technology uses active amine components as absorbents, which require heating desorption or spray desorption to achieve CO2 desorption and separation and absorbent regeneration.

[0003] CO2 mineralization curing concrete technology can realize the mineralization and utilization of CO2. This technology uses compressed CO2 to replace part of the high-pressure steam to cure industrial solid waste concrete. Steam and CO2 react with Ca ions in concrete to generate CaO3 to achieve the mineralization and fixation of CO2.

[0004] Chinese patent CN117190539A discloses a heat pump driven air direct carbon capture device based on TVSA cycle, which uses the evaporator and condenser of the heat pump to provide cooling and heat for the adsorption and desorption processes of the DAC system, thereby realizing efficient utilization of the heat pump system. This technology is a technical improvement based on existing equipment and technology, and is not suitable for the coupling integration of DAC and CO2 mineralization curing concrete technology.

[0005] Chinese patent CN117679910A discloses a direct air carbon capture method and system, which uses the existing air circulation devices and air flow channels of petrochemical enterprises to provide stable airflow and regeneration heat for DAC, realizing the integration of DAC system with existing petrochemical equipment. This technology mainly focuses on the integration of DAC device and petrochemical equipment, and does not reduce the existing steam generator and other major energy-consuming equipment in the DAC system, and is not suitable for the integration of DAC and concrete curing technology.

[0006] Chinese patent CN118123988A discloses a method for preparing solid concrete blocks and a curing system, which progressively cures solid waste concrete by coupling carbon dioxide mineralization with steam, and appropriately reduces the use of steam and carbon dioxide gas. This technology improves the existing CO2 mineralization curing concrete technology, does not involve the coupling integration of the DAC system, and does not expand the utilization channels of concrete curing steam. Summary of the invention

[0007] The present invention solves the problems of high energy consumption and high cost faced by the existing DAC device and CO2 mineralization curing concrete technology respectively, and proposes a direct air carbon capture and concrete mineralization curing coupling system, which expands the utilization channels of concrete curing steam, improves the steam utilization efficiency of CO2 mineralization curing concrete technology, and reduces the technical cost.

[0008] In order to achieve the above objectives, the following technical solutions are proposed: A direct air carbon capture and concrete mineralization curing coupling system comprises a direct air carbon capture device, a concrete mineralization curing device and a fan, wherein the fan provides a stable airflow for the direct air carbon capture device to adsorb CO2, the concrete mineralization curing device draws out a high-pressure steam to desorb CO2 from the direct air carbon capture device, and the direct air carbon capture device is provided with a first air path for conveying the desorbed CO2 to the concrete mineralization curing device.

[0009] The desorption process of the direct air carbon capture device of the present invention is provided with heat or sprayed with water by high-pressure steam, and the desorbed CO2 is directly used for concrete curing, thereby simplifying the DAC device and efficiently utilizing the concrete curing steam. The focus is on solving the problems of high energy consumption of DAC heating desorption and high water consumption of desorption liquid spray desorption in the prior art, expanding the utilization channels of concrete curing steam, improving the steam utilization efficiency of CO2 mineralization curing concrete technology, and reducing technical costs. The regenerated CO2 does not need to go through the condensation and separation steps of the traditional DAC device, and can directly enter the CO2 mineralization curing kettle for concrete curing. The DAC device no longer needs to be separately configured with a steam generator and a condenser, and the CO2 mineralization curing concrete system no longer needs an additional CO2 storage tank.

[0010] Preferably, the direct air carbon capture device includes a dehumidification module and a CO2 desorption-adsorption module, the CO2 desorption-adsorption module is provided with a CO2 adsorbent, and the fan is provided with a third air path blowing directly to the CO2 desorption-adsorption module and a fourth air path blowing to the CO2 desorption-adsorption module through the dehumidification module.

[0011] When the fan of the present invention is working, it provides a stable airflow for the DAC device to adsorb CO2. The airflow first passes through the dehumidification module of the DAC device, and then passes through the CO2 adsorption module to capture CO2 in the air. When the adsorbent is regenerated, the adsorption module is purged with high-pressure steam to achieve heating regeneration or wet spray regeneration, and the fan is used to cool the adsorbent.

[0012] Preferably, the concrete mineralization curing device comprises a CO2 mineralization curing kettle and a steam boiler, wherein the steam boiler is provided with a second gas path for conveying high-pressure water vapor to the CO2 mineralization curing kettle, wherein the CO2 mineralization curing kettle is provided with concrete, wherein the Ca ions in the concrete react with CO2 to generate CaO3.

[0013] The present invention pressurizes the CO2 obtained by direct air carbon capture and uses it for concrete mineralization curing. The steam in the curing process can be used for CO2 regeneration, realizing process coupling between the CO2 capture end and the utilization end, and efficiently utilizing the concrete curing steam and its waste heat.

[0014] Preferably, the moisture collected by the dehumidification module is transported to the steam boiler through the fifth gas path.

[0015] Preferably, the CO2 desorption-adsorption module is provided with an air exhaust path.

[0016] Preferably, the CO2 desorption-adsorption module is provided with a pair, namely a first CO2 desorption-adsorption module and a second CO2 desorption-adsorption module which perform adsorption-desorption alternately.

[0017] Preferably, the concrete mineralization curing device leads out a high-pressure steam to drive a steam turbine, the steam turbine is connected to the fan through a coupling, and the high-pressure steam for desorbing CO2 from the direct air carbon capture device is led out from the steam turbine.

[0018] The concrete mineralization curing device of the present invention leads out a high-pressure steam for driving a steam turbine, the steam turbine and the fan are connected by a coupling, and the steam turbine leads out a high-pressure steam for desorbing CO2 from a direct air carbon capture device. The present invention leads out the high-pressure steam in the CO2 mineralization curing concrete process to drive the steam turbine and drive the fan to work, thereby replacing the original electric fan in the DAC device, and the adsorption process of the DAC device is powered by the high-pressure steam of concrete curing.

[0019] Preferably, the CO2 adsorption duration and CO2 desorption duration of the CO2 desorption-adsorption module are both 0.5 to 2.5 hours.

[0020] Preferably, the curing temperature of the CO2 mineralization curing kettle is 50-90°C, and the curing time is 2-5h.

[0021] Preferably, the steam pressure of the steam turbine is 0.2-1.6 MPa, and the steam flow rate is 30-100 m 3 / h.

[0022] The beneficial effects of the present invention are: 1. By coupling the DAC device and CO2 mineralization curing concrete technology, the DAC device is powered and the efficient recycling of concrete curing steam is achieved, which reduces the energy and water consumption of the DAC device. Conventional DAC devices provide adsorption airflow through electric fans and achieve CO2 desorption through heating or humidification. 2. Through technical coupling and integration, the DAC device and CO2 mineralization curing concrete technical equipment are streamlined, and the technical cost is reduced. Conventional DAC devices need to be equipped with steam generators and other heating and humidification equipment and CO2 condensation and separation modules, and conventional CO2 mineralization curing concrete technology requires CO2 storage tanks and pressure regulating equipment; 3. The present invention has wide applicability and is compatible with the two desorption processes of heating and spraying in DAC technology, and can realize the continuous and synchronous operation of the DAC device and the CO2 mineralization curing concrete system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system composition of the present invention.

[0024] Figure 2 It is a working principle diagram of the present invention.

[0025] Among them: 1. CO2 mineralization curing kettle; 2. steam turbine; 3. coupling; 4. fan; 5. direct air carbon capture device; 6. dehumidification module; 7. first CO2 desorption-adsorption module; 8. second CO2 desorption-adsorption module; 9. steam boiler. DETAILED DESCRIPTION

[0026] Embodiment 1: This embodiment proposes a direct air carbon capture and concrete mineralization curing coupling system, refer to Figure 1 , including a direct air carbon capture device 5, a direct air carbon capture device 5, a concrete mineralization curing device 1 and a fan 4, wherein the fan 4 delivers a stable airflow to the direct air carbon capture device 5 for CO2 adsorption, the concrete mineralization curing device is provided with a high-pressure steam for desorbing CO2 from the direct air carbon capture device 5, and the direct air carbon capture device 5 is provided with a first gas path for delivering the desorbed CO2 to the concrete mineralization curing device for mineralization curing of the concrete. The desorption process is provided with heat or spraying water by high-pressure steam, and the desorbed CO2 is directly used for concrete curing, thereby simplifying the direct air carbon capture device 5 and efficiently utilizing the concrete curing steam. The focus is on solving the problems of high energy consumption of DAC heating desorption and high water consumption of desorption liquid spraying desorption in the prior art, expanding the utilization channels of concrete curing steam, improving the steam utilization efficiency of CO2 mineralization curing concrete technology, and reducing technical costs. The regenerated CO2 does not need to go through the condensation and separation steps of the traditional direct air carbon capture device 5, and can directly enter the CO2 mineralization curing kettle for concrete curing. The direct air carbon capture device 5 no longer needs to be equipped with a steam generator and a condenser separately, and the CO2 mineralization curing concrete system no longer needs an additional CO2 storage tank.

[0027] The direct air carbon capture device 5 of the present invention includes a CO2 desorption-adsorption module and a dehumidification module 6, wherein the CO2 desorption-adsorption module is provided with a CO2 adsorbent for adsorbing CO2, and the fan 4 is provided with a third gas path and a fourth gas path, wherein the third gas path is directly connected to the fan 4 and the CO2 desorption-adsorption module so that the gas is directly blown from the fan 4 to the CO2 desorption-adsorption module, and the fourth gas path is connected to the dehumidification module 6 and the CO2 desorption-adsorption module in sequence so that the gas is first blown to the dehumidification module 6 for dehumidification, and then blown to the CO2 desorption-adsorption module after dehumidification.

[0028] When the fan of the present invention is working, it provides a stable airflow for the direct air carbon capture device 5 to adsorb CO2. The airflow first passes through the dehumidification module 6 of the direct air carbon capture device 5, and then passes through the CO2 adsorption module to capture CO2 in the air. When the adsorbent is regenerated, the adsorption module is purged with high-pressure steam to achieve heating regeneration or wet spray regeneration, and the fan is used to cool the adsorbent.

[0029] The concrete mineralization curing device of the present invention is provided with a steam boiler 9 and a CO2 mineralization curing kettle 1. The steam boiler 9 is provided with a second gas path for conveying high-pressure water vapor to the CO2 mineralization curing kettle 1. The CO2 mineralization curing kettle 1 stores concrete to be mineralized and cured. The CO2 conveyed by the CO2 desorption-adsorption module reacts with the Ca ions in the concrete to generate CaO3. The present invention pressurizes the CO2 obtained by direct air carbon capture and uses it for concrete mineralization curing. The steam in the curing process can be used for CO2 regeneration, realizing the process coupling between the CO2 capture end and the utilization end, and efficiently utilizing the concrete curing steam and its waste heat.

[0030] The dehumidification module 6 of the present invention is provided with a fifth gas path for conveying the collected moisture to the steam boiler 9. The CO2 desorption-adsorption module of the present invention is provided with an exhaust gas path for exhausting the gas after the CO2 adsorption.

[0031] The working principle of the present invention is as follows: refer to Figure 2 The fan works to provide adsorption airflow for the direct air carbon capture device 55, with an air flow of 2000-5000m 3 / h; the airflow first passes through the dehumidification module 6 to remove moisture and then enters the CO2 adsorption-desorption module 7 or 8 respectively, and the adsorption time lasts for 0.5 to 2.5 hours. The moisture collected by the dehumidification module is sent to the steam boiler 9 for recycling, and the air after CO2 removal is discharged for treatment. The direct air carbon capture device 5 desorbs after the CO2 adsorption is completed. During desorption, the CO2 desorption-adsorption module 7 or 8 is heated or sprayed with steam drawn from the turbine 2. The desorption process lasts for 0.5 to 2.5 hours; the desorbed CO2 returns to the CO2 mineralization curing kettle 1 under the purge of steam, and is used together with the high-pressure steam provided by the steam boiler 9 to perform concrete curing. The curing time is 2 to 5 hours, and the curing temperature is 50 to 90°C. After the desorption is completed, the adsorbent is purged with the airflow provided by the fan after dehydration to achieve cooling and drying of the adsorbent. The purge time lasts for 0.5 to 1.5 hours.

[0032] This embodiment provides power for the direct air carbon capture device 5 and realizes efficient recycling of concrete curing steam by coupling the direct air carbon capture device 5 and CO2 mineralization curing concrete technology, and realizes CO2 desorption by heating or humidification; This embodiment realizes the simplification of the direct air carbon capture device 5 and the CO2 mineralization curing concrete technical equipment through technical coupling integration, and reduces the technical cost. The conventional direct air carbon capture device 5 needs to be equipped with heating and humidification equipment such as a steam generator and a CO2 condensation separation module, and the conventional CO2 mineralization curing concrete technology requires a CO2 storage tank and a pressure regulating device; This embodiment has wide applicability, is compatible with the two desorption processes of heating and spraying in the DAC technology, and realizes the continuous and synchronous operation of the direct air carbon capture device 5 and the CO2 mineralization curing concrete system.

[0033] Embodiment 2: This embodiment improves the fan on the basis of embodiment 1, and proposes a direct air carbon capture and concrete mineralization curing coupling system. Figure 1, including a direct air carbon capture device 5, a direct air carbon capture device 5, a concrete mineralization curing device 1 and a fan 4, wherein the fan 4 delivers a stable airflow to the direct air carbon capture device 5 for CO2 adsorption, the concrete mineralization curing device is provided with a high-pressure steam for desorbing CO2 from the direct air carbon capture device 5, and the direct air carbon capture device 5 is provided with a first gas path for delivering the desorbed CO2 to the concrete mineralization curing device for mineralization curing of the concrete. The desorption process is provided with heat or spraying water by high-pressure steam, and the desorbed CO2 is directly used for concrete curing, thereby simplifying the direct air carbon capture device 5 and efficiently utilizing the concrete curing steam. The focus is on solving the problems of high energy consumption of DAC heating desorption and high water consumption of desorption liquid spraying desorption in the prior art, expanding the utilization channels of concrete curing steam, improving the steam utilization efficiency of CO2 mineralization curing concrete technology, and reducing technical costs. The regenerated CO2 does not need to go through the condensation and separation steps of the traditional direct air carbon capture device 5, and can directly enter the CO2 mineralization curing kettle for concrete curing. The direct air carbon capture device 5 no longer needs to be equipped with a steam generator and a condenser separately, and the CO2 mineralization curing concrete system no longer needs an additional CO2 storage tank.

[0034] The concrete mineralization curing device of the present invention leads out a high-pressure steam for driving the steam turbine 2, and the steam turbine 2 is connected to the fan 4 through a coupling 3. The steam turbine 2 leads out a high-pressure steam for desorbing CO2 from the direct air carbon capture device 5. The present invention leads out the high-pressure steam in the CO2 mineralization curing concrete process to drive the steam turbine and drive the fan to work, thereby replacing the original electric fan in the direct air carbon capture device 5. The adsorption process of the direct air carbon capture device 5 is powered by the high-pressure steam of concrete curing.

[0035] The direct air carbon capture device 5 of the present invention includes a CO2 desorption-adsorption module and a dehumidification module 6, wherein the CO2 desorption-adsorption module is provided with a CO2 adsorbent for adsorbing CO2, and the fan 4 is provided with a third gas path and a fourth gas path, wherein the third gas path is directly connected to the fan 4 and the CO2 desorption-adsorption module so that the gas is directly blown from the fan 4 to the CO2 desorption-adsorption module, and the fourth gas path is connected to the dehumidification module 6 and the CO2 desorption-adsorption module in sequence so that the gas is first blown to the dehumidification module 6 for dehumidification, and then blown to the CO2 desorption-adsorption module after dehumidification.

[0036] When the fan of the present invention is working, it provides a stable airflow for the direct air carbon capture device 5 to adsorb CO2. The airflow first passes through the dehumidification module 6 of the direct air carbon capture device 5, and then passes through the CO2 adsorption module to capture CO2 in the air. When the adsorbent is regenerated, the adsorption module is purged with high-pressure steam to achieve heating regeneration or wet spray regeneration, and the fan is used to cool the adsorbent.

[0037] The concrete mineralization curing device of the present invention is provided with a steam boiler 9 and a CO2 mineralization curing kettle 1. The steam boiler 9 is provided with a second gas path for conveying high-pressure water vapor to the CO2 mineralization curing kettle 1. The CO2 mineralization curing kettle 1 stores concrete to be mineralized and cured. The CO2 conveyed by the CO2 desorption-adsorption module reacts with the Ca ions in the concrete to generate CaO3. The present invention pressurizes the CO2 obtained by direct air carbon capture and uses it for concrete mineralization curing. The steam in the curing process can be used for CO2 regeneration, realizing the process coupling between the CO2 capture end and the utilization end, and efficiently utilizing the concrete curing steam and its waste heat.

[0038] The dehumidification module 6 of the present invention is provided with a fifth gas path for conveying the collected moisture to the steam boiler 9. The CO2 desorption-adsorption module of the present invention is provided with an exhaust gas path for exhausting the gas after the CO2 adsorption.

[0039] The working principle of the present invention is as follows: refer to Figure 2 The high-pressure steam in the CO2 mineralization curing kettle 1 is led to the turbine 2, with a steam pressure of 0.2-1.6 MPa and a flow rate of 30-100 m 3 / h, the steam turbine drives the coupling 3 and drives the fan 4 to work.

[0040] The fan works to provide adsorption airflow for the direct air carbon capture device 55, with an air flow of 2000-5000m 3 / h; the airflow first passes through the dehumidification module 6 to remove moisture and then enters the CO2 adsorption-desorption module 7 or 8 respectively, and the adsorption time lasts for 0.5 to 2.5 hours. The moisture collected by the dehumidification module is sent to the steam boiler 9 for recycling, and the air after CO2 removal is discharged for treatment. The direct air carbon capture device 5 desorbs after the CO2 adsorption is completed. During desorption, the CO2 desorption-adsorption module 7 or 8 is heated or sprayed with steam drawn from the turbine 2. The desorption process lasts for 0.5 to 2.5 hours; the desorbed CO2 returns to the CO2 mineralization curing kettle 1 under the purge of steam, and is used together with the high-pressure steam provided by the steam boiler 9 to perform concrete curing. The curing time is 2 to 5 hours, and the curing temperature is 50 to 90°C. After the desorption is completed, the adsorbent is purged with the airflow provided by the fan after dehydration to achieve cooling and drying of the adsorbent. The purge time lasts for 0.5 to 1.5 hours.

[0041] This embodiment provides power for the direct air carbon capture device 5 and realizes efficient recycling of concrete curing steam by coupling the direct air carbon capture device 5 and the CO2 mineralization curing concrete technology, thereby reducing the energy consumption and water consumption of the direct air carbon capture device 5. The conventional direct air carbon capture device 5 provides adsorption airflow through an electric fan and realizes desorption of CO2 through heating or humidification. This embodiment realizes the simplification of the direct air carbon capture device 5 and the CO2 mineralization curing concrete technical equipment through technical coupling integration, and reduces the technical cost. The conventional direct air carbon capture device 5 needs to be equipped with heating and humidification equipment such as a steam generator and a CO2 condensation separation module, and the conventional CO2 mineralization curing concrete technology requires a CO2 storage tank and a pressure regulating device; This embodiment has wide applicability, is compatible with the two desorption processes of heating and spraying in the DAC technology, and realizes the continuous and synchronous operation of the direct air carbon capture device 5 and the CO2 mineralization curing concrete system.

[0042] Embodiment 3: This embodiment improves the direct air carbon capture device 5 on the basis of embodiment 2, and proposes a direct air carbon capture and concrete mineralization curing coupling system. Figure 1 , including a direct air carbon capture device 5, a concrete mineralization curing device 1 and a fan 4, wherein the fan 4 delivers a stable airflow to the direct air carbon capture device 5 for CO2 adsorption, the concrete mineralization curing device is provided with a high-pressure steam for desorbing CO2 from the direct air carbon capture device 5, and the direct air carbon capture device 5 is provided with a first gas path for delivering the desorbed CO2 to the concrete mineralization curing device for mineralization curing of the concrete. The desorption process is provided with heat or spraying water by high-pressure steam, and the desorbed CO2 is directly used for concrete curing, thereby simplifying the direct air carbon capture device 5 and efficiently utilizing the concrete curing steam. The focus is on solving the problems of high energy consumption of DAC heating desorption and high water consumption of desorption liquid spraying desorption in the prior art, expanding the utilization channels of concrete curing steam, improving the steam utilization efficiency of CO2 mineralization curing concrete technology, and reducing technical costs. The regenerated CO2 does not need to go through the condensation and separation steps of the traditional direct air carbon capture device 5, and can directly enter the CO2 mineralization curing kettle for concrete curing. The direct air carbon capture device 5 no longer needs to be equipped with a steam generator and a condenser separately, and the CO2 mineralization curing concrete system no longer needs an additional CO2 storage tank.

[0043] The present invention is provided with a pair of CO2 desorption-adsorption modules, namely a first CO2 desorption-adsorption module 7 and a second CO2 desorption-adsorption module 8. The first CO2 desorption-adsorption module 7 and the second CO2 desorption-adsorption module 8 perform adsorption-desorption alternately.

[0044] The concrete mineralization curing device of the present invention leads out a high-pressure steam for driving the steam turbine 2, and the steam turbine 2 is connected to the fan 4 through a coupling 3. The steam turbine 2 leads out a high-pressure steam for desorbing CO2 from the direct air carbon capture device 5. The present invention leads out the high-pressure steam in the CO2 mineralization curing concrete process to drive the steam turbine and drive the fan to work, thereby replacing the original electric fan in the direct air carbon capture device 5. The adsorption process of the direct air carbon capture device 5 is powered by the high-pressure steam of concrete curing.

[0045] The direct air carbon capture device 5 of the present invention includes a CO2 desorption-adsorption module and a dehumidification module 6, wherein the CO2 desorption-adsorption module is provided with a CO2 adsorbent for adsorbing CO2, and the fan 4 is provided with a third gas path and a fourth gas path, wherein the third gas path is directly connected to the fan 4 and the CO2 desorption-adsorption module so that the gas is directly blown from the fan 4 to the CO2 desorption-adsorption module, and the fourth gas path is connected to the dehumidification module 6 and the CO2 desorption-adsorption module in sequence so that the gas is first blown to the dehumidification module 6 for dehumidification, and then blown to the CO2 desorption-adsorption module after dehumidification.

[0046] When the fan of the present invention is working, it provides a stable airflow for the direct air carbon capture device 5 to adsorb CO2. The airflow first passes through the dehumidification module 6 of the direct air carbon capture device 5, and then passes through the CO2 adsorption module to capture CO2 in the air. When the adsorbent is regenerated, the adsorption module is purged with high-pressure steam to achieve heating regeneration or wet spray regeneration, and the fan is used to cool the adsorbent.

[0047] The concrete mineralization curing device of the present invention is provided with a steam boiler 9 and a CO2 mineralization curing kettle 1. The steam boiler 9 is provided with a second gas path for conveying high-pressure water vapor to the CO2 mineralization curing kettle 1. The CO2 mineralization curing kettle 1 stores concrete to be mineralized and cured. The CO2 conveyed by the CO2 desorption-adsorption module reacts with the Ca ions in the concrete to generate CaO3. The present invention pressurizes the CO2 obtained by direct air carbon capture and uses it for concrete mineralization curing. The steam in the curing process can be used for CO2 regeneration, realizing the process coupling between the CO2 capture end and the utilization end, and efficiently utilizing the concrete curing steam and its waste heat.

[0048] The dehumidification module 6 of the present invention is provided with a fifth gas path for conveying the collected moisture to the steam boiler 9. The CO2 desorption-adsorption module of the present invention is provided with an exhaust gas path for exhausting the gas after the CO2 adsorption.

[0049] The working principle of the present invention is as follows: refer to Figure 2 The high-pressure steam in the CO2 mineralization curing kettle 1 is led to the turbine 2, with a steam pressure of 0.2-1.6 MPa and a flow rate of 30-100 m 3 / h, the steam turbine drives the coupling 3 and drives the fan 4 to work.

[0050] The fan works to provide adsorption airflow for the direct air carbon capture device 55, with an air flow of 2000-5000m 3 / h; the airflow first passes through the dehumidification module 6 to remove moisture and then enters the CO2 adsorption-desorption module 7 or 8 respectively, and the adsorption time lasts for 0.5 to 2.5 hours. The moisture collected by the dehumidification module is sent to the steam boiler 9 for recycling, and the air after CO2 removal is discharged for treatment. The direct air carbon capture device 5 desorbs after the CO2 adsorption is completed. During desorption, the CO2 desorption-adsorption module 7 or 8 is heated or sprayed with steam drawn from the turbine 2. The desorption process lasts for 0.5 to 2.5 hours; the desorbed CO2 returns to the CO2 mineralization curing kettle 1 under the purge of steam, and is used together with the high-pressure steam provided by the steam boiler 9 to perform concrete curing. The curing time is 2 to 5 hours, and the curing temperature is 50 to 90°C. After the desorption is completed, the adsorbent is purged with the airflow provided by the fan after dehydration to achieve cooling and drying of the adsorbent. The purge time lasts for 0.5 to 1.5 hours. The direct air carbon capture device 5 is provided with two independent CO2 adsorption-desorption modules, which are respectively connected to the steam pipeline and the fan air flow channel; the two modules alternately perform the adsorption-desorption process, which can realize the continuous operation of the direct air carbon capture device 5 and provide continuous CO2 gas for the CO2 mineralization curing concrete system.

[0051] This embodiment provides power for the direct air carbon capture device 5 and realizes efficient recycling of concrete curing steam by coupling the direct air carbon capture device 5 and the CO2 mineralization curing concrete technology, thereby reducing the energy consumption and water consumption of the direct air carbon capture device 5. The conventional direct air carbon capture device 5 provides adsorption airflow through an electric fan and realizes desorption of CO2 through heating or humidification. This embodiment realizes the simplification of the direct air carbon capture device 5 and the CO2 mineralization curing concrete technical equipment through technical coupling integration, and reduces the technical cost. The conventional direct air carbon capture device 5 needs to be equipped with heating and humidification equipment such as a steam generator and a CO2 condensation separation module, and the conventional CO2 mineralization curing concrete technology requires a CO2 storage tank and a pressure regulating device; This embodiment has wide applicability, is compatible with the two desorption processes of heating and spraying in the DAC technology, and realizes the continuous and synchronous operation of the direct air carbon capture device 5 and the CO2 mineralization curing concrete system.

Claims

1. A direct air carbon capture and concrete mineralization curing coupling system, characterized in that: The invention comprises a direct air carbon capture device (5), a concrete mineralization curing device and a fan (4), wherein the fan (4) provides a stable airflow for the direct air carbon capture device (5) to adsorb CO2, the concrete mineralization curing device draws out a high-pressure steam to desorb CO2 from the direct air carbon capture device (5), and the direct air carbon capture device (5) is provided with a first air path for conveying the desorbed CO2 to the concrete mineralization curing device.

2. A direct air carbon capture and concrete mineralization curing coupling system according to claim 1, characterized in that: The direct air carbon capture device (5) comprises a dehumidification module (6) and a CO2 desorption-adsorption module, wherein a CO2 adsorbent is arranged in the CO2 desorption-adsorption module, and the fan (4) is provided with a third air path blowing directly to the CO2 desorption-adsorption module and a fourth air path blowing to the CO2 desorption-adsorption module through the dehumidification module (6).

3. A direct air carbon capture and concrete mineralization curing coupling system according to claim 2, characterized in that: The concrete mineralization curing device comprises a CO2 mineralization curing kettle (1) and a steam boiler (9), wherein the steam boiler (9) is provided with a second gas path for conveying high-pressure water vapor to the CO2 mineralization curing kettle (1), and the CO2 mineralization curing kettle (1) is provided with concrete, wherein Ca ions in the concrete react with CO2 to generate CaO3.

4. A direct air carbon capture and concrete mineralization curing coupling system according to claim 3, characterized in that: The moisture collected by the dehumidification module (6) is transported to the steam boiler (9) via the fifth gas path.

5. The direct air carbon capture and concrete mineralization curing coupling system according to claim 2 is characterized in that: The CO2 desorption-adsorption module is provided with an air exhaust path.

6. A direct air carbon capture and concrete mineralization curing coupling system according to claim 2 or 5, characterized in that: The CO2 desorption-adsorption module is provided with a pair, namely a first CO2 desorption-adsorption module (7) and a second CO2 desorption-adsorption module (8) which perform adsorption-desorption alternately.

7. A direct air carbon capture and concrete mineralization curing coupling system according to any one of claims 1 to 5, characterized in that: The concrete mineralization curing device leads out a high-pressure steam to drive a steam turbine (2); the steam turbine (2) is connected to a fan (4) via a coupling (3); and the high-pressure steam for desorbing CO2 from a direct air carbon capture device (5) is led out from the steam turbine (2).

8. The direct air carbon capture and concrete mineralization curing coupling system according to claim 2 is characterized in that: The CO2 adsorption duration and CO2 desorption duration of the CO2 desorption-adsorption module are both 0.5 to 2.5 hours.

9. The direct air carbon capture and concrete mineralization curing coupling system according to claim 3 is characterized in that: The curing temperature of the CO2 mineralization curing kettle (1) is 50-90°C, and the curing time is 2-5 hours.

10. The direct air carbon capture and concrete mineralization curing coupling system according to claim 7, characterized in that: The steam pressure of the steam turbine (2) is 0.2-1.6 MPa, and the steam flow rate is 30-100 m 3 / h.

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