Method for producing coal gas, reactor and system for producing coal gas

Abstract

The application relates to the technical field of metallurgy, in particular to a method for producing coal gas, a reactor and a system for producing coal gas. The method comprises the following steps: performing a chemical reaction on carbon-containing powder and CO2 gas to obtain coal gas; wherein the chemical reaction takes blast furnace slag as a reaction heat source, and the temperature of the chemical reaction is controlled to be a first set temperature. The method strengthens the blast furnace slag waste heat recovery capacity, reduces the water consumption of blast furnace slag water quenching, simultaneously realizes CO2 consumption and emission reduction, and is beneficial to the low-carbon and green development of the blast furnace.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and in particular to a method, reactor, and system for producing coal gas. Background Technology

[0002] Blast furnace slag, a byproduct of ironmaking, has a large discharge volume (200-300 kg / tFe) and a high discharge temperature (~1500℃), possessing abundant high-quality waste heat resources. Currently, water quenching is the main method for treating blast furnace slag, but this process suffers from high water consumption and low waste heat recovery. Compared to water quenching, dry granulation waste heat recovery technology for blast furnace slag offers advantages such as effective recovery and utilization of high-grade waste heat, reduced water consumption, reduced pollution, and resource utilization of blast furnace slag. However, the granulation effect is unstable, and it has not yet been put into large-scale use.

[0003] Therefore, without changing the existing water quenching process, it is crucial to find ways to improve the waste heat recovery capacity of blast furnace slag and reduce water consumption. Summary of the Invention

[0004] This application provides a method, reactor, and system for producing coal gas to solve the problem of poor waste heat recovery capacity of blast furnace slag in the prior art.

[0005] In a first aspect, this application provides a method for producing coal gas, the method comprising:

[0006] A chemical reaction is carried out between carbon-containing powder and CO2 gas to obtain coal gas; wherein the chemical reaction uses blast furnace slag as the heat source and the temperature of the chemical reaction is controlled at a first set temperature.

[0007] Optionally, the temperature of the reaction heat source is 1400℃-1500℃.

[0008] Optionally, the first set temperature is 900℃-1100℃.

[0009] Optionally, the CO2 gas is industrially captured CO2, and the purity of the CO2 gas is ≥99.0%.

[0010] Optionally, the fineness of the carbon-containing powder is 80 mesh to 200 mesh.

[0011] Optionally, after the chemical reaction of carbon-containing powder and CO2 gas to obtain coal gas, the process further includes:

[0012] The gas is cooled and then dust is removed.

[0013] The CO2 content in the gas after dust removal is tested to determine whether the gas is qualified; wherein, if the volume fraction of CO2 in the gas is ≤10%, the gas is considered qualified.

[0014] If the volume fraction of CO2 in the gas is >10%, the gas is deemed unqualified. The gas after dust removal is then circulated for the chemical reaction until the gas passes the test.

[0015] Secondly, this application provides a reactor (1) for carrying out the chemical reaction described in the first aspect, the reactor (1) comprising:

[0016] A reaction unit (11) is used to carry out the chemical reaction;

[0017] An anchoring unit (12), used to fix the reactor (1), is disposed on the outside of the reaction unit (11);

[0018] An adhesive layer (13) is provided on the outer wall of the reaction unit (11) for attaching refractory material to the reaction unit (11).

[0019] A refractory layer (14), used to resist the temperature of the reaction heat source, is disposed on the surface of the adhesive layer (13).

[0020] Thirdly, this application provides a system for producing coal gas to implement the method described in the first aspect, the system comprising:

[0021] The reactor (1) described in the second aspect is used to carry out the chemical reaction described in the first aspect;

[0022] A blower (2) is used to transport gas with a second set temperature and is connected to the feed inlet of the reactor (1);

[0023] The feeder (3) is used to transport the carbon-containing powder and is connected to the outlet of the blower (2) and the inlet of the reactor (1).

[0024] A heat exchange system (4) is used to cool the gas and is connected to the gas outlet of the reactor (1);

[0025] The dust removal system (5) is used to remove dust from the cooled coal gas and is connected to the outlet of the heat exchange system (4).

[0026] A gas detection system (6) is used to detect the CO2 content in the coal gas after dust removal. It is connected to the outlet of the dust removal system (5) and the inlet of the fan (2).

[0027] Optionally, the second set temperature is ≤250℃.

[0028] Optionally, the heat exchange system (4) includes:

[0029] A heat exchanger (41) is used for the first cooling of the gas, and

[0030] A heat exchanger (42) is used to perform a second cooling on the gas after the first cooling;

[0031] The outlet of the heat exchanger (41) is connected to the inlet of the heat exchanger (42);

[0032] The outlet of the heat exchanger (42) is connected to the inlet of the dust removal system (5).

[0033] The technical solutions provided in this application have the following advantages compared with the prior art:

[0034] The gas production method provided in this application enhances the waste heat recovery capacity of blast furnace slag, reduces the water consumption of blast furnace slag water quenching, and achieves CO2 consumption and emission reduction, which is conducive to the low-carbon and green development of blast furnaces. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic flow diagram of a method for producing coal gas provided in an embodiment of this application;

[0038] Figure 2 A cross-sectional schematic diagram of a reactor provided in an embodiment of this application;

[0039] Figure 3 A flow chart of a coal gas production system is provided for an embodiment of this application. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0042] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in the description of this application, terms such as "comprising" and "including" mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0043] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0044] Firstly, this application provides a method for producing coal gas; please refer to [link to relevant documentation]. Figure 1 The method includes:

[0045] S1. A chemical reaction is carried out between carbon-containing powder and CO2 gas to obtain coal gas; wherein the chemical reaction uses blast furnace slag as the heat source and the temperature of the chemical reaction is controlled at a first set temperature.

[0046] Blast furnace slag, a byproduct of ironmaking, has a tapping temperature of approximately 1500°C. In this embodiment, before water quenching the hot blast furnace slag, the heat from the high-temperature zone within the slag is fully utilized, and a strong endothermic reaction occurs at high temperatures using CO2 and carbon-containing powder. The reaction temperature is 700℃~800℃ (high temperature is conducive to the forward reaction), thus obtaining high-temperature coal gas.

[0047] In some embodiments, the temperature of the reaction heat source is 1400°C-1500°C.

[0048] Blast furnace slag serves as a heat source in the aforementioned chemical reaction, with temperatures reaching 1400℃-1500℃. Specifically, the temperature of the heat source can be 1400℃, 1450℃, 1500℃, etc.

[0049] In some implementations, the first set temperature is 900°C-1100°C.

[0050] In the embodiments of the application, the above chemical reaction is as follows: The positive effects of setting the temperature to 900℃-1100℃ are that it promotes the forward reaction and ensures complete CO production. If the temperature is too high, it may affect the reactor's lifespan and system safety to some extent; if the temperature is too low, it may affect the reaction rate, leading to incomplete reaction and a high CO2 content in the gas. Specifically, the set temperature can be 900℃, 950℃, 1000℃, 1050℃, 1100℃, etc.

[0051] In some embodiments, the CO2 gas is industrially captured CO2 with a purity ≥ 99.0%.

[0052] The positive effects of selecting CO2 gas for industrial CO2 capture include: utilizing CO2 in the production process and reducing carbon emissions.

[0053] The positive effects of controlling CO2 gas purity to ≥99.0% include: high product gas purity, high calorific value, and a wide range of downstream users. If CO2 gas purity is too low, it will affect the gas purity and calorific value to some extent, limiting downstream users. Specifically, CO2 gas purity can be 99.0%, 99.1%, 99.2%, 99.3%, etc.

[0054] In some embodiments, the fineness of the carbon-containing powder is 80 mesh to 200 mesh.

[0055] The positive effects of setting the fineness of the carbon-containing powder to 80-200 mesh are: the finer powder allows for more complete contact with CO2 gas, resulting in a more thorough reaction. If the fineness of the carbon-containing powder is too high, it will affect the reaction conversion rate to some extent; if the fineness is too low, it will increase the powder production cost to some extent. Specifically, the fineness of the carbon-containing powder can be 80 mesh, 100 mesh, 120 mesh, 140 mesh, 160 mesh, 180 mesh, 200 mesh, etc. In the embodiments of this application, the carbon-containing powder can be coke powder, dry ash, etc.

[0056] In some embodiments, after the chemical reaction of carbon-containing powder and CO2 gas to obtain coal gas, the process further includes:

[0057] S2. Cool the gas and then remove dust;

[0058] S3. The CO2 content in the gas after dust removal is tested to determine whether the gas is qualified; wherein, if the volume fraction of CO2 in the gas is ≤10%, the gas is deemed qualified.

[0059] If the volume fraction of CO2 in the gas is >10%, the gas is deemed unqualified. The gas after dust removal is then circulated for the chemical reaction until the gas passes the test.

[0060] In this embodiment, the high-temperature coal gas obtained from the above chemical reaction is cooled by a heat exchanger. First, the high-temperature coal gas exchanges heat with the medium water in the first heat exchanger to generate steam, which can be used for power generation and can supply power to the fan and feeder. Its positive effect is energy saving. Second, it passes through the second heat exchanger to preheat the medium CO2 gas, and the preheated CO2 gas is used for the above chemical reaction. Its positive effect is to accelerate the reaction process.

[0061] After two steps of heat exchange and cooling, the coal gas is then subjected to dust removal, which has the positive effect of reducing the dust content of the crude coal gas and obtaining clean coal gas.

[0062] Testing the gas after dust removal and controlling the CO2 content to ≤10% has the following positive effects: high gas quality, which can meet the needs of more downstream users; if the CO2 content is >10%, it will affect the gas quality to some extent and increase purification costs. Specifically, the CO2 content in the gas composition can be: 10%, 9%, 8%, 7%, 6%, etc.

[0063] Secondly, this application provides a reactor (1) for carrying out the chemical reaction described in the first aspect; see [link to relevant documentation]. Figure 2The reactor (1) comprises:

[0064] A reaction unit (11) is used to carry out the chemical reaction;

[0065] An anchoring unit (12), used to fix the reactor (1), is disposed on the outside of the reaction unit (11);

[0066] An adhesive layer (13) is provided on the outer wall of the reaction unit (11) for attaching refractory material to the reaction unit (11).

[0067] A refractory layer (14), used to resist the temperature of the reaction heat source, is disposed on the surface of the adhesive layer (13).

[0068] In this embodiment, the reactor is used to generate high-temperature coal gas by the above-mentioned chemical reaction. The reactor is a prefabricated structure. The reaction unit (11) is a reaction tube, which is made of seamless tungsten tube. Its advantages are: strong heat resistance, length of 2m to 4m, diameter of 15cm to 25cm, and wall thickness of 2cm to 3cm; thermocouples are buried at 0.5m intervals in the axial direction.

[0069] The anchoring unit (12) is an anchor hook, and several anchor hooks are spot-welded and arranged crosswise on the outside of the reaction tube.

[0070] The adhesive layer (13) sprayed on the outer wall of the reaction tube is made of aluminum dihydrogen phosphate and has a thickness of 1mm to 2mm.

[0071] The refractory layer (14) is made of Al2O3-SiC-C material. Its positive effects are: high strength, good thermal shock resistance and slag resistance. Its prefabricated thickness is 8cm to 12cm. When the thickness is reduced to 1 / 4 to 1 / 3 of the prefabricated thickness, the refractory material on the outside of the reactor needs to be replaced.

[0072] Thirdly, this application provides a system for producing coal gas to implement the method described in the first aspect; please refer to [link to relevant documentation]. Figure 3 The system includes:

[0073] The reactor (1) described in the second aspect is used to carry out the chemical reaction described in the first aspect;

[0074] A blower (2) is used to transport gas with a second set temperature and is connected to the feed inlet of the reactor (1);

[0075] The feeder (3) is used to transport the carbon-containing powder and is connected to the outlet of the blower (2) and the inlet of the reactor (1).

[0076] A heat exchange system (4) is used to cool the gas and is connected to the gas outlet of the reactor (1);

[0077] The dust removal system (5) is used to remove dust from the cooled coal gas and is connected to the outlet of the heat exchange system (4).

[0078] A gas detection system (6) is used to detect the CO2 content in the coal gas after dust removal. It is connected to the outlet of the dust removal system (5) and the inlet of the fan (2).

[0079] The blower (2) is used to transport CO2, and the feeder (3) can be a rotary feeder used to transport carbon-containing powder. The blower (2) and the feeder (3) can form a pneumatic conveying device. The blower brings in CO2 gas at a certain pressure, and the rotary feeder transports the dried carbon-containing powder. The two are mixed and transported to the reactor through a pressure-fed dilute phase conveyor. Strongly endothermic reaction. In the embodiments of this application, the pressure of CO2 gas is 0.2MPa to 0.5MPa, and the weight ratio of carbon powder to CO2 gas is 0.5 to 2.0.

[0080] The heat exchange system (4) is used for cooling high-temperature coal gas, and the dust removal system (5) can be a dry bag filter for removing impurities from the cooled coal gas; the gas detection system (6) can be an online gas chromatograph or an infrared gas analyzer for detecting the CO2 content in the coal gas.

[0081] In some embodiments, the second set temperature is ≤250°C.

[0082] The positive effects of controlling the temperature of the blower to transport gas ≤250℃ are: maintaining the blower's stable operation within the allowable operating range; if the temperature is too high, it will place higher demands on the blower's quality to a certain extent, and there is a risk of gas leakage.

[0083] In some embodiments, the heat exchange system (4) includes:

[0084] A heat exchanger (41) is used for the first cooling of the gas, and

[0085] A heat exchanger (42) is used to perform a second cooling on the gas after the first cooling;

[0086] The outlet of the heat exchanger (41) is connected to the inlet of the heat exchanger (42);

[0087] The outlet of the heat exchanger (42) is connected to the inlet of the dust removal system (5).

[0088] In this embodiment, the heat exchange system (4) includes a heat exchanger (41) and a heat exchanger (42), which are used for two-step cooling of high-temperature gas. In the first cooling, water is used as the medium, and the steam generated by heat exchange can be used for power generation. In the second cooling, it can be used for preheating CO2 gas, thus accelerating the reaction process.

[0089] This coal gas production system is implemented based on the above-mentioned coal gas production method. The specific steps of this coal gas production method can refer to the above-mentioned embodiment. Since this coal gas production system adopts some or all of the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, and will not be elaborated here one by one.

[0090] The following will further elaborate on this application in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate this application and not to limit the scope of this application. For the experimental methods without specific conditions noted in the following embodiments, they are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0091] Embodiment 1

[0092] Method for producing coal gas:

[0093] Under the condition that blast furnace slag is used as the heat source, the chemical reaction provides the reaction temperature; at this temperature, the above chemical reaction is carried out on coke powder and industrially captured CO2 gas to obtain coal gas. This coal gas is cooled by heat exchange twice and then dedusted; the coal gas after dedusting is detected to determine the CO2 content in the coal gas after dedusting. If the CO2 content ≤ 10%, the coal gas is qualified; if the CO2 content > 10%, the coal gas after dedusting is subjected to the secondary chemical reaction until the coal gas is qualified.

[0094] Prefabrication of the reactor:

[0095] The reaction tube is made of seamless tungsten tube with good heat resistance, 4m in length, 20cm in diameter, and 2cm in wall thickness; thermocouples are buried at intervals of 0.5m in the axial direction; several anchor hooks arranged crosswise are spot-welded on the outside of the reaction tube; a layer of aluminum dihydrogen phosphate binder with a thickness of 1mm is sprayed on the outer wall of the reaction tube; the Al2O3-SiC-C material is used as the refractory layer, which is formed after formwork casting, curing for 48h, demoulding, baking at 110°C for 24h, and high-temperature calcination at 1450°C for 5h. The prefabricated thickness is 10cm. According to the average thinning rate of 0.2mm / h of the refractory material outside the reactor, when the refractory material thins to 1.25cm, the service life of the prefabricated reactor is about 187h. Subsequently, the refractory material outside the reactor needs to be prefabricated again.

[0096] Coal gas production system:

[0097] Before the reaction, the seamless tungsten tube reactor is immersed in the hot blast furnace slag liquid in the blast furnace slag trough. Once the temperature inside the reactor tube reaches the reaction temperature, a blower introduces 0.20 MPa slurry at a flow rate of 300 Nm³. 3 A rotary feeder delivers CO2 gas at a flow rate of 350 kg / h, along with dried coke powder containing carbon, and mixes the two in a dilute phase (solid-to-gas ratio 0.58) before feeding them into the reactor. The reaction is strongly endothermic. The resulting 900°C high-temperature coal gas is exchanged with water in the first heat exchanger to generate steam for power generation, supplying electricity to the blower and rotary feeder. The gas then preheats to 150°C in the second heat exchanger. After two heat exchange stages, the 200°C low-temperature coal gas undergoes dry baghouse dust collection, achieving an outlet particulate matter concentration of less than 5 mg / Nm³. 3 The online gas chromatograph monitors the composition of coal gas (CO, CO2, H2, N2, etc.). If the coal gas composition is qualified (CO2≤10%), it can be put into the coal gas storage tank or used by downstream users. If the coal gas composition is unqualified (CO2>10%), the coal gas needs to be circulated for a secondary reaction until the coal gas composition is qualified.

[0098] Example 2

[0099] Reactor prefabrication:

[0100] The reaction tube is a seamless tungsten tube with good heat resistance, 3m in length, 16cm in diameter, and 2cm in wall thickness. Thermocouples are embedded at 0.5m intervals along the axial direction. Several anchor hooks are spot-welded to the outside of the reaction tube in a cross arrangement. The outer wall of the reaction tube is sprayed with an aluminum dihydrogen phosphate bonding layer with a thickness of 1mm. Al2O3-SiC-C material is used as the refractory layer. After casting in molds, curing for 48 hours, demolding, baking at 110℃ for 24 hours, and calcining at 1450℃ for 5 hours, the prefabricated reactor is formed with a thickness of 12cm. Based on the average thinning rate of the refractory material on the outside of the reactor (0.2mm / h), when the refractory material is thinned to 1.25cm, the service life of the prefabricated reactor is approximately 187 hours. The refractory material on the outside of the reactor needs to be re-prefabricated subsequently. Based on the average thinning rate of the refractory material on the outside of the reactor (0.2mm / h), when the refractory material is thinned to 1.50cm, the service life of the prefabricated reactor is approximately 225 hours. The refractory material on the outside of the reactor needs to be re-prefabricated subsequently.

[0101] Gas production system:

[0102] Before the reaction, the seamless tungsten tube reactor is immersed in the hot blast furnace slag liquid in the blast furnace slag trough. Once the temperature inside the reactor tube reaches the reaction temperature, a blower introduces 0.25 MPa slurry at a flow rate of 400 Nm³. 3 A rotary feeder delivers CO2 gas at a flow rate of 700 kg / h, along with dried carbonaceous ash powder after drying. The two are mixed and transported in a dilute phase (solid-to-gas ratio 0.875) into the reactor for further processing. The reaction is strongly endothermic. The high-temperature coal gas, after the reaction at 900–1000℃, exchanges heat with water in the first heat exchanger to generate steam for power generation, supplying electricity to the blower and rotary feeder. The CO2 gas is then preheated to approximately 150℃ in the second heat exchanger. After two heat exchange stages, the low-temperature coal gas, at approximately 200℃, undergoes dry baghouse dust collection, achieving an outlet particulate matter concentration of less than 5 mg / Nm³. 3 The online gas chromatograph monitors the composition of coal gas (CO, CO2, H2, N2, etc.). If the coal gas composition is qualified (CO2≤10%), it can be put into the coal gas storage tank or used by downstream users. If the coal gas composition is unqualified (CO2>10%), the coal gas needs to be circulated for a secondary reaction until the coal gas composition is qualified.

[0103] Example 3

[0104] The blast furnace slag heat source temperature, reaction temperature, industrial CO2 capture purity, CO2 gas flow rate, and carbon-containing powder fineness were changed, while other parameters remained the same as in Example 1.

[0105] Example 4

[0106] The blast furnace slag heat source temperature, reaction temperature, industrial CO2 capture purity, CO2 gas flow rate, and carbon-containing powder fineness were changed, while other parameters remained the same as in Example 1.

[0107] Table 1. Process conditions and results for producing coal gas.

[0108]

[0109] As can be seen from Table 1, the method, reactor and system for producing coal gas provided in this application can greatly enhance the waste heat recovery capacity of blast furnace slag, reduce the water consumption of blast furnace slag water quenching, and achieve CO2 consumption and emission reduction, which is conducive to the low-carbon and green development of blast furnaces.

[0110] Comparative Example 1, which lowered the reaction temperature; and Comparative Example 2, which lowered the purity of industrially captured CO2; or Comparative Example 4, which lowered the fineness of the carbon-containing powder, will all reduce the final gas flow rate to some extent.

[0111] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for producing coal gas, characterized in that, The method is carried out in reactor (1). The reactor (1) includes: A reaction unit (11) is used to carry out a chemical reaction; the reaction unit (11) is a reaction tube, and the reaction tube is a seamless tungsten tube. An anchoring unit (12), used to fix the reactor (1), is disposed on the outside of the reaction unit (11); An adhesive layer (13) is provided on the outer wall of the reaction unit (11) for attaching refractory material to the reaction unit (11); A refractory layer (14), used to resist the temperature of the reaction heat source, is disposed on the surface of the adhesive layer (13); The method includes: Before the chemical reaction, the seamless tungsten tube is immersed in the hot blast furnace slag liquid in the blast furnace slag ditch. When the temperature inside the seamless tungsten tube reaches the first set temperature, the carbon powder and CO2 gas mixed dilute phase are transported to the reactor (1) for chemical reaction to obtain coal gas. The chemical reaction uses the blast furnace slag as the heat source and controls the temperature of the chemical reaction to the first set temperature. The temperature of the reaction heat source is 1400℃-1500℃; The first set temperature is 900℃-1100℃; The CO2 gas is industrially captured CO2, and the purity of the CO2 gas is ≥99.0%. The fineness of the carbon-containing powder is 80 mesh to 200 mesh; After obtaining the gas, it also includes: The gas is cooled and then dust is removed. The CO2 content in the gas after dust removal is tested to determine whether the gas is qualified; wherein, if the volume fraction of CO2 in the gas is ≤10%, the gas is considered qualified. If the volume fraction of CO2 in the gas is >10%, the gas is deemed unqualified. The gas after dust removal is then recycled for the chemical reaction until the gas passes the test.

2. A system for producing coal gas, characterized in that, The system for implementing the method of claim 1 includes: The reactor (1) according to claim 1 is used to carry out the chemical reaction; A blower (2) is used to transport gas with a second set temperature and is connected to the feed inlet of the reactor (1); The feeder (3) is used to transport the carbon-containing powder and is connected to the outlet of the blower (2) and the inlet of the reactor (1); A heat exchange system (4) is used to cool the gas and is connected to the gas outlet of the reactor (1); The dust removal system (5) is used to remove dust from the cooled coal gas and is connected to the outlet of the heat exchange system (4); The gas detection system (6) is used to detect the CO2 content in the gas after dust removal, and is connected to the outlet of the dust removal system (5) and the inlet of the fan (2).

3. The system according to claim 2, characterized in that, The second set temperature is ≤250℃.

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