An in-situ conversion system for a low-carbon cement production path

Abstract

The present invention discloses an in-situ conversion system for a low-carbon cement production path, comprising: a blending device for uniformly blending limestone and a catalyst; an in-situ conversion device for subjecting the limestone to an in-situ methanation reaction under the action of a catalyst to generate methane and lime, and outputting carbon compound gas, lime, and catalyst; a cooling and separation device for cooling the carbon compound gas and separating water vapor contained in the carbon compound gas; a first storage device for pressurized storage of the carbon compound; a heat exchange device for achieving heat exchange between the solid outlet of the in-situ conversion device and the output end of the blending device through solid-solid heat exchange; a solid separation device for separating the lime and catalyst mixture output by the heat exchange device; and a second storage device for storing the lime. The system can improve energy utilization efficiency and reduce carbon dioxide emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of cement production, and in particular to an in-situ conversion system for a low-carbon cement production path. Background Art

[0002] The cement industry, which accounts for 6-8% of global carbon emissions, derives approximately 60% of its carbon emissions from the pyrolysis of carbonates in limestone, while another 35% comes from the fossil fuel combustion that powers this pyrolysis process. Relying solely on changes in the energy mix will not fundamentally and effectively achieve the cement industry's carbon reduction targets. Currently, low-carbon technology development for the cement industry primarily includes fuel substitution, waste heat power generation, feedstock substitution, and CCUS technology. Fuel substitution effectively reduces 35% of carbon emissions from fossil fuels by introducing clean or low-carbon energy sources. Waste heat power generation and feedstock substitution indirectly reduce carbon emissions by improving energy efficiency or reducing the need for limestone pyrolysis. While these methods can reduce carbon emissions to a certain extent, they are not sufficient to directly achieve carbon neutrality in the cement industry. While CCUS technologies can simultaneously reduce carbon emissions from limestone pyrolysis and fossil fuel combustion, their application in the cement industry, such as amine adsorption and calcium recycling, faces challenges due to their complex processes and high energy requirements. Therefore, it is necessary to develop new carbon emission reduction technologies suitable for the industry based on the production process characteristics of cement itself, and to build a clean, low-carbon, and efficient modern new energy production system for my country's building materials industry. Summary of the Invention

[0003] The present invention aims to solve, at least to some extent, one of the technical problems in the related art. To this end, the first object of the present invention is to propose an in-situ conversion system for a low-carbon cement production path, which produces lime through an in-situ methanation reaction, realizes the storage of hydrogen energy (methane) from power-to-gas, and the processing and utilization of CO2 released by limestone pyrolysis. By coupling the exothermic methanation reaction with the endothermic decomposition reaction of limestone carbonate, the reaction exotherm is replaced by fossil fuel combustion for energy supply, significantly improving energy utilization efficiency and reducing carbon dioxide emissions.

[0004] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes an in-situ conversion system for a low-carbon production path of cement, the system comprising: a blending device, the input end of the blending device being respectively connected to the limestone feed path and the supplementary catalyst feed path, the blending device being used to uniformly blend the limestone and the catalyst; an in-situ conversion device, the input end of the in-situ conversion device being respectively connected to the output end of the blending device and the hydrogen inlet path, the in-situ conversion device being used to cause the limestone to undergo an in-situ methanation reaction under the action of the catalyst to generate methane and lime, and output carbon-containing compound gas, lime and catalyst; a cooling and separation device, the air inlet of the cooling and separation device being connected to the gas outlet of the in-situ conversion device, the cooling and separation device being used to cool the carbon-containing compound gas and separate the water vapor contained in the carbon-containing compound gas. ; a first storage device, the first storage device is connected to the output end of the cooling and separation device, and is used for pressurized storage of carbon-containing compounds; a heat exchange device, the input end of the heat exchange device is connected to the solid outlet of the in-situ conversion device, and the heat exchange device is used to achieve heat exchange between the solid outlet of the in-situ conversion device and the output end of the blending device by solid-solid heat exchange; a solid separation device, the input end of the solid separation device is connected to the output end of the heat exchange device, and the solid separation device separates the lime and catalyst mixture output by the heat exchange device, and transports the catalyst to the blending device through the first output end of the solid separation device; a second storage device, the second storage device is connected to the second output end of the solid separation device, and the second storage device is used to store lime.

[0005] According to an in-situ conversion system for a low-carbon cement production path according to an embodiment of the present invention, limestone and a supplementary catalyst are uniformly blended in a blending device and then transported to an in-situ conversion device. During the transport process, a heat exchange device preheats the limestone and catalyst mixture. In the in-situ conversion device, limestone and hydrogen undergo an in-situ methanation reaction under the action of a catalyst to produce methane and lime. The carbon-containing compound gas is transported to a cooling and separation device through the gas outlet of the in-situ conversion device, and the lime and catalyst mixture is transported to a heat exchange device through the solid outlet of the in-situ conversion device. The cooling and separation device cools the carbon-containing compound gas and liquefies and separates the water vapor contained in the carbon-containing compound gas. The carbon-containing compound gas is then transported to a first storage device, where the carbon-containing compound gas is pressurized and stored. The heat exchange device transfers the heat carried by the lime and catalyst mixture to the output end of the blending device through solid-solid heat exchange to preheat the limestone and catalyst mixture. The cooled lime and catalyst mixture is then transported to a solid separation device. The solid separation device separates the lime and catalyst, transports the catalyst to the blending device for recycling, and transports the lime to the second storage device for storage. This system produces lime through in-situ methanation, achieving power-to-gas hydrogen energy storage (methane) and the processing and utilization of CO2 released by limestone pyrolysis. By coupling the exothermic methanation reaction with the endothermic decomposition reaction of limestone carbonate, the reaction exothermicity replaces fossil fuel combustion for energy, significantly improving energy efficiency and reducing carbon dioxide emissions.

[0006] In addition, the in-situ conversion system for low-carbon cement production according to the above embodiment of the present invention may also have the following additional technical features:

[0007] According to one embodiment of the present invention, the blending device is a mixer.

[0008] According to one embodiment of the present invention, the number of the in-situ conversion device is at least one. When there are multiple in-situ conversion devices, the multiple in-situ conversion devices are connected in series.

[0009] According to one embodiment of the present invention, the in-situ conversion device includes: a reaction bed, the gas inlet of the reaction bed is connected to the hydrogen inlet air path, the solid inlet of the reaction bed is connected to the output end of the blending device, and the solid outlet of the reaction bed is connected to the input end of the heat exchange device. The reaction bed is used to cause the limestone to undergo an in-situ methanation reaction under the action of a catalyst to generate methane and lime, and to transport the mixture of lime and catalyst to the heat exchange device through the solid outlet; a heat exchanger, which is arranged between the gas inlet of the reaction bed and the hydrogen inlet air path; a first separator, the gas outlet of the reaction bed is connected to the input end of the first separator through the heat exchanger, and the output end of the first separator is connected to the air inlet of the cooling and separation device; the heat exchanger is used to exchange heat between the gas output from the reaction bed and the hydrogen to preheat the hydrogen.

[0010] According to one embodiment of the present invention, the in-situ conversion device operates at a constant temperature.

[0011] According to one embodiment of the present invention, the cooling and separation device includes: a first cooler, the air inlet of the first cooler is connected to the output end of the first separator; a second separator, the input end of the second separator is connected to the output end of the first cooler; and a dryer, the input end of the dryer is connected to the output end of the second separator.

[0012] According to one embodiment of the present invention, the first storage device includes: a compressor, the input end of the compressor is connected to the output end of the dryer; a second cooler, the input end of the second cooler is connected to the output end of the compressor; and a storage tank, the storage tank is connected to the output end of the second cooler.

[0013] According to one embodiment of the present invention, the heat exchange device is a solid-solid heat exchanger.

[0014] According to one embodiment of the present invention, the solid separation device is a particle size screening machine.

[0015] According to one embodiment of the present invention, the second storage device is a steel silo or a lime silo.

[0016] Compared with the prior art, the in-situ conversion system for low-carbon cement production pathway of the present invention has the following beneficial effects:

[0017] 1) Lime production through in-situ methanation reaction, achieving hydrogen energy storage (methane) from power-to-gas and processing and utilization of CO2 released by limestone pyrolysis.

[0018] 2) By coupling the exothermic methanation reaction with the endothermic decomposition reaction of limestone carbonate, the exothermic reaction replaces the energy supply of fossil fuel combustion, greatly improving the energy utilization efficiency.

[0019] 3) Heat exchange between the outlet gas and the inlet gas is used to preheat the inlet gas, thereby avoiding additional energy demand and effectively utilizing the waste heat of the outlet gas.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A block diagram of an in-situ conversion system for a low-carbon cement production pathway according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of an in-situ conversion device according to one embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a cooling and separation device according to one embodiment of the present invention;

[0024] Figure 4 FIG. 1 is a schematic diagram of a first storage device according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] 10. Blending device; 20. In-situ conversion device; 21. Reactor bed; 22. Heat exchanger; 23. First separator; 30. Cooling separation device; 31. First cooler; 32. Second separator; 33. Dryer; 40. First storage device; 41. Compressor; 42. Second cooler; 43. Storage tank; 50. Heat exchange device; 60. Solid separation device; 70. Second storage device. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0028] It's important to understand that calcium carbonate, dolomite, and siderite generate hydrocarbons under high temperature and pressure in a hydrogen atmosphere. Compared to carbonate pyrolysis in a nitrogen atmosphere, the decomposition temperature of carbonates in a hydrogen atmosphere is approximately 150K lower. Methanation, currently the only exothermic reaction in in-situ carbonate hydrogenation, offers unique advantages. It can provide energy for carbonate decomposition, improving energy efficiency and covering or significantly reducing the external energy demand during the in-situ conversion phase. Applying in-situ methanation to the cement industry can directly and effectively address carbon emissions from carbonate pyrolysis and fossil fuel combustion, perfectly aligning with cement production processes. Furthermore, as a power-to-gas conversion pathway, its application in the cement industry offers dual benefits: carbon reduction for the cement industry and hydrogen storage for new energy. Given my country's diverse cement industry, abundant clean energy resources, and the challenges of transporting hydrogen and CO2, developing limestone in-situ methanation technology within existing natural gas pipelines holds significant potential.

[0029] The following describes an in-situ conversion system for a low-carbon cement production pathway proposed in an embodiment of the present invention with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the in-situ conversion system for the low-carbon production path of cement according to an embodiment of the present invention may include: a blending device 10, an in-situ conversion device 20, a cooling and separation device 30, a first storage device 40, a heat exchange device 50, a solid separation device 60 and a second storage device 70.

[0031] Wherein, the input end of the blending device 10 is connected to the limestone feed path and the supplementary catalyst feed path respectively, and the blending device 10 is used to uniformly blend the limestone and the catalyst. In some embodiments, the blending device 10 is a mixer, and the limestone and the catalyst can be uniformly and fully mixed by the mixer. The mixer can be a horizontal trough mixer, a ribbon mixer, a V-type mixer, a double-helix cone mixer, a high-speed mixer, etc.

[0032] The input end of the in-situ reforming device 20 is connected to the output end of the blending device 10 and the hydrogen inlet gas line, respectively. The in-situ reforming device 20 is used to cause the limestone to undergo an in-situ methanation reaction under the action of a catalyst to produce methane and lime, and output carbon compound gas, lime, and catalyst. The air inlet of the cooling and separation device 30 is connected to the gas outlet of the in-situ reforming device 20. The cooling and separation device 30 is used to cool the carbon compound gas and separate the water vapor contained in the carbon compound gas. The first storage device 40 is connected to the output end of the cooling and separation device 30 and is used to pressurize and store the carbon compound.

[0033] Furthermore, the input end of the heat exchange device 50 is connected to the solid outlet of the in-situ conversion device 20. The heat exchange device 50 is used to achieve heat exchange between the solid outlet of the in-situ conversion device 20 and the output end of the blending device 10 through solid-solid heat exchange. In some embodiments, the heat exchange device 50 is a solid-solid heat exchanger.

[0034] The input end of the solid separation device 60 is connected to the output end of the heat exchange device 50 . The solid separation device 60 separates the lime and catalyst mixture output from the heat exchange device 50 and transports the catalyst to the blending device 10 through the first output end of the solid separation device 60 .

[0035] The second storage device 70 is connected to the second output end of the solid separation device 60 and is used to store lime. In some embodiments, the second storage device 70 is a steel silo or a lime silo.

[0036] Specifically, if Figure 1 As shown, limestone and supplemental catalyst are uniformly blended in a blending device 10 and then transported to an in-situ reforming device 20. During transport, the limestone and catalyst mixture is preheated by a heat exchange device 50. In the in-situ reforming device 20, the limestone and hydrogen undergo an in-situ methanation reaction under the action of the catalyst to produce methane and lime. The carbon-containing gas is transported to a cooling and separation device 30 through the gas outlet of the in-situ reforming device 20, and the lime and catalyst mixture is transported to a heat exchange device 50 through the solids outlet of the in-situ reforming device 20.

[0037] Furthermore, the cooling and separation device 30 cools the carbon-containing compound gas and liquefies and separates the water vapor contained in the carbon-containing compound gas. The carbon-containing compound gas is then transferred to the first storage device 40, where the carbon-containing compound gas is pressurized and stored. The heat exchange device 50 transfers heat carried by the lime and catalyst mixture to the output end of the blending device 10 through solid-solid heat exchange to preheat the limestone and catalyst mixture. The cooled lime and catalyst mixture is then transferred to the solid separation device 60. The solid separation device 60 separates the lime and catalyst, transfers the catalyst to the blending device 10 for recycling, and transfers the lime to the second storage device 70 for storage.

[0038] According to one embodiment of the present invention, there is at least one in-situ conversion device 20. When there are multiple in-situ conversion devices 20, the multiple in-situ conversion devices 20 are connected in series. The multiple in-situ conversion devices 20 connected in series can improve the conversion rate of limestone into lime and increase the methane content in the carbon compound gas.

[0039] According to one embodiment of the present invention, the in-situ conversion device 20 operates at a constant temperature, wherein the constant temperature corresponds to a temperature of about 600°C.

[0040] According to one embodiment of the present invention, Figure 2 As shown, the in-situ conversion device 20 includes: a reaction bed 21, the gas inlet of the reaction bed 21 is connected to the hydrogen inlet gas path, the solid inlet of the reaction bed 21 is connected to the output end of the blending device 10, and the solid outlet of the reaction bed 21 is connected to the input end of the heat exchange device 50. The reaction bed 21 is used to cause the limestone to undergo an in-situ methanation reaction under the action of the catalyst to generate methane and lime, and to transport the mixture of lime and catalyst to the heat exchange device 50 through the solid outlet; a heat exchanger 22, which is arranged between the gas inlet of the reaction bed 21 and the hydrogen inlet gas path; a first separator 23, the gas outlet of the reaction bed 21 is connected to the input end of the first separator 23 through the heat exchanger 22, and the output end of the first separator 23 is connected to the gas inlet of the cooling separation device 30; the heat exchanger 22 is used to exchange heat between the gas output from the reaction bed 21 and the hydrogen to preheat the hydrogen.

[0041] Specifically, hydrogen, after being preheated by heat exchanger 22, enters reaction bed 21, where it undergoes an in-situ methanation reaction with a mixture of limestone and catalyst entering the bed through its solids inlet, producing methane and lime. After the in-situ methanation reaction is complete, the lime and catalyst mixture is transported to heat exchanger 50 through the solids outlet of reaction bed 21. The carbon-containing compound gas is transported to first separator 23 through its gas outlet. During transport, the hydrogen undergoes cooling and heat exchange with the hydrogen through heat exchanger 22, preheating the hydrogen and liquefying the water vapor in the carbon-containing compound gas. First separator 23 separates the condensed water from the carbon-containing compound gas.

[0042] According to one embodiment of the present invention, Figure 3 As shown, the cooling and separation device 30 includes: a first cooler 31, the air inlet of the first cooler 31 is connected to the output end of the first separator 23; a second separator 32, the input end of the second separator 32 is connected to the output end of the first cooler 31; a dryer 33, the input end of the dryer 33 is connected to the output end of the second separator 32.

[0043] Specifically, the carbon compound gas output from the first separator 23 is cooled again by the first cooler 31 to liquefy the water vapor in the carbon compound gas. The second separator 32 separates the condensed water, and then enters the dryer 33 to further remove the water vapor in the carbon compound gas to obtain dehydrated methane natural gas.

[0044] According to one embodiment of the present invention, Figure 4As shown, the first storage device 40 includes: a compressor 41, the input end of the compressor 41 is connected to the output end of the dryer 33; a second cooler 42, the input end of the second cooler 42 is connected to the output end of the compressor 41; and a storage tank 43, the storage tank 43 is connected to the output end of the second cooler 42.

[0045] Specifically, the dehydrated methane natural gas output from the dryer 33 is pressurized by the compressor 41 , then enters the cooler for cooling, and finally enters the storage tank 43 for storage.

[0046] The working process of the in-situ conversion system according to an embodiment of the present invention will be described in detail below with reference to a specific example.

[0047] Specifically, the limestone (100% CaCO₃) particles are 45 microns, the catalyst Ni / Al₂O₃ particles are 80 microns, the limestone to catalyst ratio is 5:1 by mass, the limestone feed rate is 100 tons / hour, the hydrogen feed rate is 8.8 tons / hour, the reaction pressure is 0.5 MPa, and the compressor 41 efficiency is set at 0.7. Thermodynamic calculations show that, with the in-situ methanation reaction temperature set at a constant 600°C, the system can complete the reaction without any external heat source. When four in-situ conversion units 20 are connected in series, the efficiency of converting limestone (CaCO₃) to cement (CaO) reaches over 97%, and the methane content of the methane natural gas exceeds 90%. For local use, it can be transported directly without repressurization. When pressurized to 10 MPa for long-distance natural gas pipeline transportation, the compressor 41 power is 2000 kilowatts.

[0048] In summary, according to the in-situ conversion system for the low-carbon production path of cement according to an embodiment of the present invention, limestone and supplementary catalyst are uniformly blended in a blending device and then transported to the in-situ conversion device, and during the transportation process, a heat exchange device preheats the limestone and catalyst mixture. In the in-situ conversion device, limestone and hydrogen undergo an in-situ methanation reaction under the action of a catalyst to generate methane and lime, and the carbon-containing compound gas is transported to a cooling and separation device through the gas outlet of the in-situ conversion device, and the mixture of lime and catalyst is transported to a heat exchange device through the solid outlet of the in-situ conversion device; the cooling and separation device cools the carbon-containing compound gas and liquefies and separates the water vapor contained in the carbon-containing compound gas, and then transports the carbon-containing compound gas to a first storage device, where the carbon-containing compound gas is pressurized and stored. The heat exchange device transfers the heat carried by the mixture of lime and catalyst to the output end of the blending device by solid-solid heat exchange to preheat the limestone and catalyst mixture, and then transports the cooled lime and catalyst mixture to a solid separation device. The solid separation device separates the lime and catalyst, transports the catalyst to the blending device for recycling, and transports the lime to the second storage device for storage. This system produces lime through in-situ methanation, achieving power-to-gas hydrogen energy storage (methane) and the processing and utilization of CO2 released by limestone pyrolysis. By coupling the exothermic methanation reaction with the endothermic decomposition reaction of limestone carbonate, the reaction exothermicity replaces fossil fuel combustion for energy, significantly improving energy efficiency and reducing carbon dioxide emissions.

[0049] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An in-situ conversion system for low-carbon cement production, characterized in that: The system comprises: A blending device, wherein the input ends of the blending device are respectively connected to the limestone feed path and the supplementary catalyst feed path, and the blending device is used to uniformly blend the limestone and the catalyst; an in-situ conversion device, wherein the input end of the in-situ conversion device is respectively connected to the output end of the blending device and the hydrogen inlet gas path, and the in-situ conversion device is used to cause the limestone to undergo an in-situ methanation reaction under the action of a catalyst to produce methane and lime, and output carbon compound gas, lime and catalyst; a cooling and separation device, wherein the gas inlet of the cooling and separation device is connected to the gas outlet of the in-situ conversion device, and the cooling and separation device is used to cool the carbon compound gas and separate the water vapor contained in the carbon compound gas; a first storage device, connected to an output end of the cooling and separation device, for pressurizing and storing carbon-containing compounds; a heat exchange device, wherein the input end of the heat exchange device is connected to the solid outlet of the in-situ conversion device, and the heat exchange device is used to achieve heat exchange between the solid outlet of the in-situ conversion device and the output end of the blending device by solid-solid heat exchange; a solid separation device, wherein the input end of the solid separation device is connected to the output end of the heat exchange device, the solid separation device separates the lime and catalyst mixture output from the heat exchange device, and transports the catalyst to the blending device through the first output end of the solid separation device; A second storage device is connected to the second output end of the solid separation device, and the second storage device is used to store lime.

2. The in-situ conversion system for low-carbon cement production according to claim 1, characterized in that: The blending device is a mixer.

3. The in-situ conversion system for low-carbon cement production according to claim 1, characterized in that: The number of the in-situ conversion device is at least one. When there are multiple in-situ conversion devices, the multiple in-situ conversion devices are connected in series.

4. The in-situ conversion system for low-carbon cement production according to claim 1 or 3, characterized in that: The in-situ conversion device comprises: a reaction bed, wherein the gas inlet of the reaction bed is connected to the hydrogen inlet gas path, the solid inlet of the reaction bed is connected to the output end of the blending device, and the solid outlet of the reaction bed is connected to the input end of the heat exchange device. The reaction bed is used to cause the limestone to undergo an in-situ methanation reaction under the action of the catalyst to generate methane and lime, and to transport the mixture of lime and catalyst to the heat exchange device through the solid outlet; a heat exchanger, the heat exchanger being arranged between the gas inlet of the reaction bed and the hydrogen inlet gas path; a first separator, wherein the gas outlet of the reaction bed is connected to the input end of the first separator through the heat exchanger, and the output end of the first separator is connected to the gas inlet of the cooling and separation device; The heat exchanger is used to exchange heat between the gas output from the reaction bed and the hydrogen, so as to preheat the hydrogen.

5. The in-situ conversion system for low-carbon cement production according to claim 1 or 3, characterized in that: The in-situ conversion device is operated at a constant temperature.

6. The in-situ conversion system for low-carbon cement production according to claim 4, characterized in that: The cooling and separation device comprises: a first cooler, wherein an air inlet of the first cooler is connected to an output end of the first separator; a second separator, wherein an input end of the second separator is connected to an output end of the first cooler; A dryer, wherein the input end of the dryer is connected to the output end of the second separator.

7. The in-situ conversion system for low-carbon cement production according to claim 6, characterized in that: The first storage device includes: a compressor, wherein an input end of the compressor is connected to an output end of the dryer; a second cooler, wherein an input end of the second cooler is connected to an output end of the compressor; A storage tank is connected to an output end of the second cooler.

8. The in-situ conversion system for low-carbon cement production according to claim 1, characterized in that: The heat exchange device is a solid-solid heat exchanger.

9. The in-situ conversion system for low-carbon cement production according to claim 1, characterized in that: The solid separation device is a particle size screening machine.

10. The in-situ conversion system for low-carbon cement production according to claim 1, characterized in that: The second storage device is a steel silo or a lime silo.

Images