Cement clinker preparation system and method based on calcium-based chemical looping gasification for hydrogen production

Abstract

This invention relates to the field of organic waste treatment and hydrogen production technology, and particularly to a cement clinker preparation system and its operation method based on calcium-based chemical looping gasification for hydrogen production. The system includes at least the following components connected in sequence: a water pump, a heat exchanger, a preheater, a calcining furnace, a rotary kiln, a cooler, a cement clinker cooling system, a gasification reactor, a first cyclone separator, a first return valve, a first bag filter, an auxiliary fuel system, a regeneration reactor, a second cyclone separator, a second return valve, a second bag filter, an ash unit, a calcium-based adsorbent conveying system, a CO2 separation and compression system, an organic waste storage unit, a vertical roller mill, a CO2-rich flue gas cooling system, and an energy-intensive air separation device. The second bag filter is connected to the rotary kiln, the gasification reactor is connected to the organic waste storage unit, and the gasification reactor is also connected to the heat exchanger. This invention mainly achieves efficient hydrogen production and carbon capture through calcium recycling technology, saving fuel consumption in calcining furnaces and rotary kilns during cement production. At the same time, it utilizes waste calcium-based adsorbent resources and ash residue separated from hydrogen-rich gas, saving raw material consumption in cement production and realizing resource recycling.

Description

Technical Field

[0001] This invention relates to the field of organic waste treatment and hydrogen production technology, and in particular to a cement clinker preparation system and its operation method based on calcium-based chemical looping gasification for hydrogen production. Background Technology

[0002] Traditional cement production requires large amounts of fuel for calcining cement raw materials. This process not only generates significant amounts of CO2 gas, exacerbating global warming and environmental pollution, but also contributes to the global energy shortage by consuming large quantities of traditional fossil fuels. Therefore, with the advancement of "dual-carbon" goals, the cement industry must transform and upgrade, accelerating its shift towards green practices, emphasizing green and low-carbon development, increasing investment in the research and application of clean energy technologies, and achieving low-carbon, clean, and efficient cement processing. Hydrogen, as a new clean energy source, has the advantages of high energy density and zero carbon emissions from combustion, making it highly suitable as a fuel for cement production, thus achieving the goal of low-carbon cement production.

[0003] A key aspect of hydrogen utilization is hydrogen production technology. Traditional methods include water electrolysis, natural gas steam reforming, and coal gasification, but these methods are not ideal in terms of energy efficiency and also generate significant carbon emissions. Calcium-based chemical looping gasification, as a novel hydrogen production method, uses calcium-based materials as an oxygen carrier. It achieves highly efficient fuel gasification without external oxygen supply, producing high-purity hydrogen. Furthermore, CO2 can be captured during the gasification process, reducing carbon emissions and contributing to low-carbon and environmentally friendly practices. However, this technology also faces challenges in system integration, reaction control, and energy management in practical applications, requiring further optimization and improvement.

[0004] Therefore, this invention mainly utilizes a calcium-based chemical chain gasification hydrogen production system to produce hydrogen from organic waste through gasification. Calcium-based materials are used as oxygen carriers and carbon dioxide adsorbents to achieve efficient and low-carbon hydrogen production. Hydrogen is then used as fuel in cement production, overcoming the shortcomings of traditional cement preparation methods. Simultaneously, waste calcium-based adsorbents and separated ash are fed into a rotary kiln to achieve resource recycling and reduce raw material consumption. A cement clinker preparation system based on calcium-based chemical chain gasification hydrogen production and its operation method are established. This system overcomes two major shortcomings of existing cement production methods: (1) severe environmental pollution and emission of large amounts of greenhouse gases; (2) inability to utilize high-temperature waste heat, resulting in low energy efficiency. It also brings three major advantages: (1) multi-stage energy utilization enables the reuse of high-temperature waste heat, improving thermal efficiency; (2) efficient hydrogen production and CO2 capture; (3) calcium-based adsorbents can be recycled, and waste calcium-based adsorbents can also be used as cement raw materials, improving resource utilization. This invention can form a new generation of green development technology for the cement industry, contributing to the successful achievement of my country's dual-carbon goals. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a cement clinker preparation system and its operation method based on calcium-based chemical looping gasification for hydrogen production. This invention primarily utilizes calcium recycling technology to achieve efficient hydrogen production and carbon capture, saving fuel consumption in calcining furnaces and rotary kilns during cement production. Simultaneously, it leverages waste calcium-based adsorbent resources and ash separated from hydrogen-rich gas, reducing raw material consumption in cement production and achieving resource recycling.

[0006] The technical solution provided by this invention is as follows:

[0007] A hydrogen-rich carbon-cycle oxygen blast furnace smelting system based on calcium-based chemical looping gasification for hydrogen production includes at least the following components connected in sequence: a water pump, a heat exchanger, a preheater, a calcining furnace, a rotary kiln, a cooler, a cement clinker cooling system, a gasification reactor, a first cyclone separator, a first return valve, a first bag filter, an auxiliary fuel system, a regeneration reactor, a second cyclone separator, a second return valve, a second bag filter, an ash unit, a calcium-based adsorbent conveying system, a CO2 separation and compression system, an organic waste storage unit, a vertical roller mill, a CO2-rich flue gas cooling system, and an energy-intensive air separation device. The second bag filter is connected to the rotary kiln, the gasification reactor is connected to the organic waste storage unit, and the gasification reactor is also connected to the heat exchanger.

[0008] Based on the above technical solution:

[0009] Organic waste enters the gasification reactor, where it undergoes pyrolysis, gasification, and reforming to form hydrogen-rich syngas. The hydrogen-rich syngas then passes through the first cyclone separator and the first bag filter to form purified hydrogen-rich syngas, and the separated ash enters the ash unit.

[0010] The calcium-based adsorbent enters the regeneration reactor for calcination and regeneration, then passes through the second cyclone separator and the second return valve into the gasification reactor, promoting the high-temperature steam reforming reaction of organic waste and the catalytic cracking of tar, and releasing heat. After capturing CO2, it passes through the first cyclone separator and the first return valve with the residual coke particles into the regeneration reactor for regeneration, and releases the CO2 it carries.

[0011] The CO2-rich flue gas generated by the regeneration reactor is separated by the second cyclone separator and the second bag filter, and after the heat is recovered by the preheater and the heat exchanger, it enters the second organic Rankine cycle and finally enters the CO2 separation and compression system for compression and storage.

[0012] In the above technical solution, the organic waste and calcium-based adsorbent undergo the following main reactions in the gasification reactor:

[0013] (1) Organic waste → H2 + CO + CH4 + tar + charcoal

[0014] (2) C + H₂O → H₂ + CO

[0015] (3) CaO + H₂O + tar → CaCO₃ + H₂

[0016] (4) CaO + CO2 → CaCO3

[0017] The main reactions involved in the regeneration reactor are as follows:

[0018] (1) CaCO3→CaO+CO2

[0019] Furthermore, the regeneration reactor is connected to the calcium-based adsorbent delivery system, the first return valve, and the second cyclone dust collector, and the second cyclone separator is connected to the second bag filter and the second return valve.

[0020] Based on the above technical solution, the calcium-based adsorbent enters the regeneration reactor for calcination and regeneration, and then enters the gasification reactor through the second cyclone separator and the second return valve. This promotes the high-temperature steam reforming reaction of organic waste and the catalytic cracking of tar, and releases heat. The generated CaCO3 enters the regeneration reactor through the first return valve to react and is converted back into CaO and releases CO2-rich flue gas.

[0021] Furthermore, the system includes a raw material unit, a preheater, a calcining furnace, a rotary kiln, a cooler, and a clinker unit arranged in sequence.

[0022] Based on the above technical solution, the raw material unit feeds cement raw materials into the preheater for drying. The dried raw materials are then calcined in the calcining furnace and the rotary kiln to become clinker, which enters the cooler. After cooling, the clinker enters the clinker unit. Meanwhile, the flue gas in the cooler absorbs the heat from the clinker and passes through and mixes with the flue gas generated by the rotary kiln and the calcining furnace before finally entering the preheater, transferring the heat it carries to the rotary kiln, the calcining furnace, and the preheater.

[0023] Furthermore, the cooler is also connected to an air unit, a preheater, a first organic Rankine cycle, and a vertical roller mill;

[0024] Based on the above technical solution, the circulating flue gas transfers heat to the cement raw materials in the preheater and then enters the cooler to absorb the heat of the clinker. At the same time, the air unit sends room temperature air into the cooler to absorb the heat of the clinker. The heated flue gas enters the rotary kiln. If the exhaust gas has a high temperature and contains dust, it enters the vertical roller mill for further processing. If the exhaust gas has a low temperature and does not contain dust, it enters the first organic Rankine cycle for power generation.

[0025] Furthermore, the rotary kiln is also connected to an energy-intensive air separation device, an auxiliary fuel chamber, a first bag filter, a second bag filter, and an ash and slag unit;

[0026] Based on the above technical solution, the energy-intensive air separation device, the auxiliary fuel chamber and the first bag filter respectively send pure oxygen, auxiliary fuel and purified hydrogen-rich synthesis gas into the rotary kiln for combustion and calcination of cement. The ash unit and the second bag filter respectively send ash and calcined calcium-based adsorbent fine powder into the rotary kiln as one of the raw materials for cement calcination.

[0027] Furthermore, the calcining furnace is also connected to an energy-intensive air separation device, an auxiliary fuel chamber, and a first bag filter.

[0028] Based on the above technical solution, the energy-intensive air separation device, the auxiliary fuel chamber and the first bag filter respectively send pure oxygen, auxiliary fuel and purified hydrogen-rich syngas into the calcining furnace for combustion and then calcining cement.

[0029] Furthermore, the system also includes a heat exchanger, a second organic Rankine cycle, and a CO2 separation and compression system connected in sequence.

[0030] Based on the above technical solution, the flue gas discharged from the heat exchanger enters the second organic Rankine cycle power generation and then enters the CO2 separation and compression system. After separation and compression, the CO2 is stored at a pressure of 150 bar.

[0031] Furthermore, the heat exchanger is also connected to a preheater, a water pump, and a gasification reactor;

[0032] Based on the above technical solution, the preheater sends the flue gas after heat exchange with cement raw materials into the heat exchanger for heating, the water pump sends water into the heat exchanger for heating, and the generated steam is sent into the gasification reactor for high-temperature steam reforming reaction.

[0033] This invention also provides a cement clinker preparation system and its operation method based on calcium-based chemical looping gasification hydrogen production. The preparation process using the system provided by this invention includes at least the following steps:

[0034] Organic waste enters the gasification reactor, and after pyrolysis, gasification and reforming, it forms hydrogen-rich syngas. The hydrogen-rich syngas passes through the first cyclone separator and the first bag filter to form purified hydrogen-rich syngas. The separated ash enters the rotary kiln through the ash unit.

[0035] The calcium-based adsorbent enters the regeneration reactor for calcination and regeneration. After passing through the second cyclone separator and the second return valve, it enters the gasification reactor to promote the high-temperature steam reforming reaction of organic waste and the catalytic cracking of tar, and releases heat. After capturing CO2, it passes through the first cyclone separator and the first return valve with the residual coke particles and enters the regeneration reactor for regeneration, and releases the CO2 it carries.

[0036] The CO2-rich flue gas generated by the regeneration reactor passes through the second cyclone separator and the second bag filter, and then enters the preheater, heat exchanger, and second organic Rankine cycle in sequence. Finally, it enters the CO2 separation and compression system, and the resulting calcined calcium-based adsorbent fine powder enters the rotary kiln.

[0037] Based on the above technical solution, the following effects can be achieved:

[0038] Based on the catalytic effect of calcium-based adsorbents, high-temperature steam reforming of organic waste and catalytic cracking of tar were realized in the gasification reactor, providing heat for the reaction and increasing the hydrogen content of the syngas.

[0039] The calcination regeneration process based on the regeneration reactor enables the reuse of calcium-based adsorbents, improves the efficiency of the gasification reaction, and releases the CO2 molecules carried by the adsorbent itself.

[0040] The separated ash and calcined calcium-based adsorbent powder are fed into a rotary kiln as one of the cement raw materials, which saves the consumption of cement raw materials and realizes the complete reuse of resources.

[0041] Based on the processing functions of the second cyclone separator and the second bag filter, the purification of CO2-rich flue gas is achieved. Based on the processing functions of the preheater, heat exchanger and the second organic Rankine cycle, the heat recovery and utilization of CO2-rich flue gas is achieved. Based on the processing function of the CO2 separation and compression system, the recovery and storage of CO2-rich flue gas is achieved, thus achieving higher energy utilization efficiency and emission reduction targets.

[0042] Furthermore, the preparation method also includes the following steps: the gas outlet of the gasification reactor is purified by a first cyclone separator and a first bag filter before entering the calcining furnace and rotary kiln.

[0043] Based on the above technical solution, the hydrogen-rich gas produced by the gasification reactor can be burned and utilized to reduce fuel consumption and achieve environmental protection and emission reduction goals.

[0044] Furthermore, the preparation method also includes the following steps: the flue gas transfers heat to the cement raw meal in the preheater and then enters the cooler. After absorbing the heat of the cement clinker in the cooler, the flue gas passes through the rotary kiln and the calcining furnace in sequence to transfer heat and then returns to the preheater to complete the flue gas circulation.

[0045] Based on the above technical solutions, the heat of flue gas can be fully utilized and the heat of cement clinker can be recovered and reused. The heat of flue gas can be used to increase the temperature of calcining furnace, rotary kiln and preheater, reduce fuel consumption and achieve environmental protection and emission reduction goals.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] This invention can overcome two major defects of existing cement production methods: (1) serious environmental pollution and emission of a large amount of greenhouse gases; (2) inability to utilize high-temperature waste heat and low energy utilization efficiency.

[0048] The present invention has the following advantages: (1) Through multi-stage energy utilization, high-temperature waste heat is reused, which improves thermal efficiency; (2) CO2 can be captured while efficiently producing hydrogen; (3) Calcium-based adsorbents can be recycled, and waste calcium-based adsorbents can also be used as cement raw materials, which improves resource utilization. Attached Figure Description

[0049] Figure 1 This is a system diagram of the cement clinker preparation system based on calcium-based chemical looping gasification hydrogen production provided by the present invention. Detailed Implementation

[0050] The principles and features of the present invention are described below. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0051] Example 1

[0052] like Figure 1 As shown, the cement clinker preparation system based on calcium-based chemical looping gasification hydrogen production includes an organic waste storage unit, a gasification reactor, a first cyclone separator, a first return valve, a regeneration reactor, a second cyclone separator, a regeneration reactor, and a second return valve connected in sequence. The regeneration reactor is also connected to a calcium-based adsorbent delivery system, and the gasification reactor is also connected to a steam delivery pipe. The second cyclone return valve is connected to the gasification reactor.

[0053] Organic waste was fed into the gasification reactor at a flow rate of 5000 kg / h, with the operating temperature set at 650°C. Simultaneously, the temperature of the regeneration reactor was adjusted to 900°C. Next, steam was added to the gasification reactor at a flow rate of 1200 kg / h, and calcium oxide powder was added to the regeneration reactor at an initial flow rate of 1500 kg / h. Under these conditions, monitoring of the gas composition at the gasification reactor outlet revealed an H2 concentration of 92.6% and an H2 yield of 429 kg / h. Furthermore, in the regeneration reactor, with increasing flow rates of calcium oxide and steam, the CO2 concentration at the regeneration reactor outlet reached 95.15%, with a yield of 4574 kg / h, optimizing the system's carbon dioxide capture and conversion capabilities. It is important to note that excessively high temperatures in the regeneration reactor may deactivate the calcium-based adsorbent, reducing its capture capacity. Therefore, in actual operation, the regeneration reactor temperature should be controlled within the range of 875–1100°C, and the gasification reactor temperature within the range of 550–700°C. By rationally configuring the calcium oxide flow rate and water vapor flow rate, as well as the temperatures of the gasification reactor and the regeneration reactor, the hydrogen production of the gasification reactor and the carbon dioxide production of the regeneration reactor are significantly improved, thereby achieving efficient resource utilization and environmental protection.

[0054] Example 2

[0055] Based on Example 1, such as Figure 1 As shown, the first cyclone separator is also connected to a first bag filter, which is connected to the ash and slag unit, the calcining furnace, and the rotary kiln. The second cyclone separator is also connected to a second bag filter, which is connected to the rotary kiln and the preheater.

[0056] The hydrogen-rich synthesis gas produced by the gasification reactor is purified by the first cyclone separator and the first bag filter before entering the calcining furnace and rotary kiln as fuel for combustion, calcining the cement raw materials. The ash produced by separation enters the rotary kiln through the ash unit as one of the cement raw materials, reducing fuel and raw material consumption and achieving the goals of full utilization of resources and environmental protection and emission reduction.

[0057] The CO2-rich flue gas generated by the regeneration reactor is purified by the second cyclone separator and the second bag filter before entering the preheater to recover and utilize the waste heat for drying cement raw materials. The separated calcined calcium-based adsorbent fine powder enters the rotary kiln as one of the cement raw materials, reducing raw material consumption and realizing the full utilization of resources.

[0058] Example 3

[0059] Based on the above embodiments, such as Figure 1 As shown, the system also includes a raw material unit, a preheater, a calcining furnace, a rotary kiln, a cooler, and a clinker unit that are connected in sequence. The preheater is also connected to the cooler, and the cooler is also connected to an air unit, a vertical roller mill, and a first organic Rankine cycle.

[0060] The raw material unit feeds cement raw materials into a preheater for drying, then into a calcining furnace and a rotary kiln for calcination into cement clinker. After cooling in a cooler, the clinker is fed into the clinker unit. In the cooler, circulating flue gas mixes with room temperature air supplied by the air unit to absorb heat from the clinker and achieve cooling. The heated flue gas then sequentially enters the rotary kiln and calcining furnace to provide heat, mixing with the high-temperature flue gas generated in the rotary kiln and calcining furnace. It then enters the preheater to provide the heat required for drying the cement raw materials. The cooled circulating flue gas then re-enters the cooler to complete the cycle, achieving multiple stages of heat utilization and meeting environmental protection and emission reduction targets.

[0061] The exhaust gas from the cooler is handled differently depending on the situation. If the exhaust gas is at a high temperature and contains dust, it enters the vertical roller mill for further processing. If the exhaust gas is at a low temperature and does not contain dust, it enters the first organic Rankine cycle for power generation, thus achieving the goals of environmental protection and resource reuse.

[0062] Example 4

[0063] Based on the above embodiments, such as Figure 1 As shown, the system further includes: a preheater, a heat exchanger, a second organic Rankine cycle, and a CO2 separation and compression system connected in sequence. The heat exchanger is also connected to a water pump and a gasification reactor.

[0064] After the cement raw materials are dried in the preheater, the CO2-rich flue gas enters the heat exchanger for heating. At the same time, a water pump sends water into the heat exchanger. The water vapor generated in the heat exchanger then enters the gasification reactor to generate hydrogen-rich syngas. The cooled CO2-rich flue gas then enters the second organic Rankine cycle for power generation and further cooling. Finally, the CO2 is compressed to 150 bar and stored by the CO2 separation and compression system, realizing carbon capture and cascade utilization of heat and the system's environmental protection and emission reduction goals.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cement clinker preparation system based on calcium-based chemical looping gasification for hydrogen production, characterized in that, It includes at least the following components connected in sequence: water pump, heat exchanger, preheater, calcining furnace, rotary kiln, cooler, cement clinker cooling system, gasification reactor, first cyclone separator, first return valve, first bag filter, auxiliary fuel system, regeneration reactor, second cyclone separator, second return valve, second bag filter, calcium-based adsorbent conveying system, CO2 separation and compression system, organic waste storage unit, vertical roller mill, CO2-rich flue gas cooling system, and energy-intensive air separation device, with the following connection methods for each component: a. The first outlet of the water pump is connected to a heat exchanger; b. The first inlet of the heat exchanger is connected to a water pump, the second inlet is connected to a preheater, the first outlet is connected to a gasification reactor, and the second outlet is connected to a second organic Kenlong cycle. c. The first inlet of the preheater is connected to the raw material unit, the second inlet is connected to the second bag filter, the third inlet is connected to the calcining furnace, the first outlet is connected to the cooler, the second outlet is connected to the calcining furnace, and the third outlet is connected to the heat exchanger. d. The first inlet of the calcining furnace is connected to a preheater, the second inlet is connected to a rotary kiln, the third inlet is connected to an auxiliary fuel chamber, the fourth inlet is connected to a first bag filter, the first outlet is connected to a preheater, and the second outlet is connected to a rotary kiln. e. The first inlet of the rotary kiln is connected to the calcining furnace, the second inlet is connected to the energy-intensive air separation device, the third inlet is connected to the cooler, the fourth inlet is connected to the second bag filter, the fifth inlet is connected to the first bag filter, the sixth inlet is connected to the auxiliary fuel chamber, the first outlet is connected to the calcining furnace, and the second outlet is connected to the cooler. f. The first inlet of the cooler is connected to a rotary kiln, the second inlet is connected to a preheater, the third inlet is connected to an air unit, the first outlet is connected to a rotary kiln, the second outlet is connected to a clinker unit, and the third outlet is connected to a vertical roller mill or a first organic Kenlong cycle. g. The first inlet of the gasification reactor is connected to a heat exchanger, the second inlet is connected to a second return valve, the third inlet is connected to an organic waste storage unit, and the first outlet is connected to a first cyclone separator; h. The first inlet of the first cyclone separator is connected to the gasification reactor, the first outlet is connected to the first bag filter, and the second outlet is connected to the first return valve; i. The first inlet of the first bag filter is connected to the first cyclone separator, the first outlet is connected to the ash and slag unit, the second outlet is connected to the calcining furnace, and the third outlet is connected to the rotary kiln. j. The first inlet of the regeneration reactor is connected to the first return valve, the second inlet is connected to the calcium-based adsorbent storage unit, and the first outlet is connected to the second cyclone separator; k. The first inlet of the second cyclone separator is connected to the regeneration reactor, the first outlet is connected to the second bag filter, and the second outlet is connected to the second return valve; l. The first outlet of the energy-intensive air separation device is connected to a calcining furnace, and the second outlet is connected to a rotary kiln.

2. The raw material is heated and dried by a preheater, and at the same time, the flue gas generated by the calcining furnace is added to the preheater to utilize the waste heat, as well as the CO2-rich flue gas generated by the regeneration reactor extracted by the second bag filter and the second cyclone separator. Furthermore, part of the flue gas generated by the preheater enters the cooler for cooling, while another part of the flue gas enters the heat exchanger to utilize the waste heat, and the dried raw material enters the calcining furnace. Furthermore, the dried raw material is fed into the calcining furnace for calcination. At the same time, pure oxygen produced by the energy-intensive air separation unit, auxiliary fuel provided by the auxiliary fuel chamber, and purified hydrogen-rich synthesis gas generated in the gasification reactor from organic waste extracted by the first bag filter and the first cyclone separator are added to the calcining furnace, and the waste heat of the flue gas generated by the rotary kiln is utilized. Furthermore, the calcined raw materials are processed in a rotary kiln. At the same time, pure oxygen produced by an energy-intensive air separation unit, auxiliary fuel provided by an auxiliary fuel chamber, and purified hydrogen-rich syngas produced in a gasification reactor from organic waste extracted by a first bag filter and a first cyclone separator are added to the rotary kiln. The waste heat from the flue gas generated by the cooler is also utilized. Furthermore, the clinker enters the cooler for cooling, and at the same time, room temperature air provided by the air unit and low-temperature flue gas generated by the preheater are added to the cooler. Furthermore, the clinker produced by the cooler enters the clinker unit, and the exhaust gas produced, if at a high temperature and containing dust, enters the vertical roller mill for further processing; if the exhaust gas is at a low temperature and does not contain dust, it enters the first organic Rankine cycle. Furthermore, water is pumped into the heat exchanger, and flue gas generated by the preheater is added into the heat exchanger to utilize the waste heat of the flue gas. Furthermore, the water is heated into steam in the heat exchanger and sent to the gasification reactor, while the flue gas discharged from the heat exchanger is sent to the second Rankine cycle. Furthermore, CO2 is separated from the flue gas in the second Rankine cycle by a CO2 separation and compression system. The CO2 is then compressed to 150 bar and stored, thus enabling the reuse of carbon. Furthermore, water vapor enters the gasification reactor, while organic waste and calcined calcium-based adsorbent from the second return valve are added to the gasification reactor. Furthermore, the hydrogen-rich synthesis gas produced by the gasification reactor enters the first cyclone separator, where it is separated from the carbonized calcium-based adsorbent. The remaining hydrogen-rich synthesis gas is then sent to the first bag filter. Furthermore, the carbonated calcium-based adsorbent enters the regeneration reactor through the first return valve, while fresh calcium-based adsorbent is added to the regeneration reactor at the same time to address the sintering and activity reduction phenomena that occur after some calcium-based adsorbents are repeatedly calcined and regenerated. Furthermore, the CO2-rich flue gas generated by the regeneration reactor enters the second cyclone separator, the calcined calcium-based adsorbent produced by the separation enters the second return valve, and the remaining CO2-rich flue gas enters the second bag filter.

3. A cement clinker preparation system based on calcium-based chemical looping hydrogen production according to claims 1 and 2, characterized in that, The calcining furnace and rotary kiln are interconnected with the gasification reactor, and the first cyclone separator and the first bag filter are interconnected to realize the calcination of cement clinker with hydrogen-rich syngas, achieving energy saving and low carbon emissions. At the same time, the ash and slag filtered by the first bag filter can be used in the rotary kiln, reducing the consumption of raw materials.

4. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to claim 3, characterized in that, The system also includes an organic waste input pipeline, which is connected to a gasification reactor for feeding organic waste into the gasification reactor for gasification treatment. The organic waste can be sludge or other organic waste, thus realizing the resource utilization of waste.

5. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to claims 1 and 2, characterized in that, The regeneration reactor is connected to the rotary kiln via a second cyclone separator and a second bag filter, so that the regenerated calcium-based adsorbent separated from the flue gas can be returned to the rotary kiln for recycling, reducing raw material consumption.

6. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to claims 1 and 2, characterized in that, The preheater is used to recover waste heat generated by the calcining furnace and rotary kiln to increase the feed temperature and further improve the system's energy efficiency.

7. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to claim 6, characterized in that, The system also includes multiple heat exchange devices, which are connected to a preheater, a heat exchanger, and a cooler, respectively, to recover and utilize the thermal energy of the flue gas and maximize energy utilization.

8. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to any one of claims 1 to 7, characterized in that, The CO2 separation and compression device is connected to the gasification reactor and is used to separate the CO2 generated during the calcination process from the mixed gas, and to compress and store it or use it for further utilization, so as to achieve low carbon emissions.

9. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to any one of claims 1 to 8, characterized in that, The system also includes a CCUS (carbon capture, utilization and storage) device, which is connected to a CO2 separation and compression device to achieve efficient utilization and storage of CO2 and accelerate the development of a low-carbon economy.

10. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to any one of claims 1 to 9, characterized in that, The calcium-based adsorbent delivery system includes a second cyclone separator, which is connected to a gasification reactor via a second return valve, enabling efficient recycling of the calcium-based adsorbent and significantly improving raw material utilization.

11. The cement clinker preparation system based on calcium-based chemical looping hydrogen production according to any one of claims 1 to 10, characterized in that, The high-temperature reactor also includes a waste gas treatment system, which is connected to a CO2 separation and compression device to treat and purify the waste gas generated during the reaction process, ensuring the environmental friendliness of the system.

12. A method for preparing cement clinker based on calcium-based chemical chaining hydrogen production, characterized in that, The preparation of cement clinker using the system according to any one of claims 1 to 11 includes at least the following steps: a. The raw materials are preheated in a preheater and then sent to a calcining furnace for calcination; b. The calcium-based adsorbent undergoes a chemical chain reaction with water vapor and organic waste in the gasification reactor to generate hydrogen gas; c. The carbonated calcium-based adsorbent is sent to the regeneration reactor via the first cyclone separator and the first return valve. The regenerated calcium-based adsorbent is then returned to the gasification reactor for recycling via the second cyclone separator and the second return valve. d. The CO2 separation and compression device separates and compresses the CO2 generated in the reaction, and then captures and stores the CO2 through the CCUS device to achieve carbon neutrality.

13. The method for preparing cement clinker based on calcium-based chemical chaining hydrogen production according to claim 12, characterized in that, It also includes the following steps: a. The heat exchange device recovers waste heat from the calcination process and uses it to preheat raw materials and steam, further improving energy efficiency; b. The gas generated by the gasification reactor is dedusted by the first cyclone separator and then enters the purification system. The purified hydrogen-rich gas is returned to the calcining furnace and rotary kiln for combustion, further optimizing energy utilization. Through these claims, the system and method of the present invention have achieved significant innovations in optimizing resource and energy utilization, reducing carbon emissions, and improving cement production efficiency, promoting green and sustainable development, and meeting the needs of global low-carbon economic development.

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