Underground gasification reaction cavity real-time regulation and control system and method

Abstract

The invention discloses an underground gasification reaction cavity real-time regulation and control system and method, and belongs to the technical field of coal underground gasification, and the system comprises a monitoring module, a data processing unit and a regulation and control module; the monitoring module is connected with the data processing unit through a data transmission line and is used for acquiring temperature, pressure and gas component data of the gasification reaction cavity in real time and transmitting the acquired data to the data processing unit; the data processing unit is connected with the regulation and control module through a control signal transmission line, and is used for processing and analyzing the received data, evaluating the state of the gasification reaction cavity and sending a control instruction to the regulation and control module; and the regulation and control module regulates and controls the gasification reaction process according to the control instruction. According to the invention, the gasification reaction efficiency is improved, the fluctuation range of the heat value of produced gas is reduced, flexible adjustment and optimization can be carried out according to different geological conditions and gasification process requirements, and resource waste and environmental pollution are effectively reduced through accurate regulation and control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground coal gasification, and particularly relates to a real-time regulation system and method for an underground gasification reaction cavity. BACKGROUND

[0002] Underground coal gasification technology, as an advanced technology that converts underground coal in situ into combustible gas, has significant advantages such as high resource utilization rate, environmental friendliness, and good safety, and has received widespread attention in recent years. During underground gasification, factors such as the shape of the gasification reaction cavity, temperature distribution, pressure change, and reaction of the gasification agent with coal have a crucial influence on the stability of the gasification reaction, the composition of the produced gas, and the calorific value.

[0003] However, the current underground gasification technology has many problems in the regulation of the reaction cavity. On the one hand, due to the complexity of the underground environment, it is difficult to accurately obtain the internal state information of the gasification reaction cavity in real time, such as the expansion direction and speed of the cavity and the reaction activity of different regions, which makes it difficult for the operator to grasp the dynamic changes of the gasification reaction in a timely manner and to make effective regulation decisions. On the other hand, the existing regulation methods are limited and can only make simple adjustments to the flow and composition of the gasification agent, and cannot accurately and comprehensively regulate the specific conditions of the gasification reaction cavity, resulting in low gasification reaction efficiency and unstable gas quality, which cannot meet the needs of industrial production. For example, when the gasification reaction cavity is locally overheated or the reaction is incomplete, the traditional regulation method often cannot quickly and effectively solve the problem, which not only affects the normal progress of the gasification reaction, but also may cause resource waste and environmental pollution. SUMMARY

[0004] In view of the above problems, the present application is proposed.

[0005] Therefore, the technical problem solved by the present application is: how to solve the problem that due to the complexity of the underground environment, it is difficult to accurately obtain the internal state information of the gasification reaction cavity in real time, such as the expansion direction and speed of the cavity and the reaction activity of different regions, which makes it difficult for the operator to grasp the dynamic changes of the gasification reaction in a timely manner and to make effective regulation decisions. The existing regulation methods are limited and can only make simple adjustments to the flow and composition of the gasification agent, and cannot accurately and comprehensively regulate the specific conditions of the gasification reaction cavity, resulting in low gasification reaction efficiency and unstable gas quality, which cannot meet the needs of industrial production.

[0006] To solve the above technical problems, the underground gasification reaction cavity real-time regulation system provided by the present application comprises a monitoring module and a data processing unit connected through a data transmission line, which is used to collect the temperature, pressure and gas composition data of the gasification reaction cavity in real time and transmit the collected data to the data processing unit; the data processing unit and a regulation module are connected through a control signal transmission line, the received data is processed and analyzed, the state of the gasification reaction cavity is evaluated, and a control instruction is sent to the regulation module; the regulation module regulates the gasification reaction process according to the control instruction.

[0007] As a preferred scheme of the underground gasification reaction cavity real-time regulation system, the monitoring module comprises a temperature monitoring submodule, a pressure monitoring submodule and a gas composition monitoring submodule; the temperature monitoring submodule is arranged with multiple temperature sensors at different depths and positions around the gasification reaction cavity, which is used to collect the temperature data of the cavity wall surface and different regions inside; the pressure monitoring submodule is installed with pressure sensors at the gasification agent injection well, the gas production well and the key positions inside the gasification reaction cavity, which is used to collect the pressure data; the gas composition monitoring submodule is provided with a gas composition analyzer at the outlet of the gas production well, which is used to analyze the composition data of the produced gas; the temperature monitoring submodule, the pressure monitoring submodule and the gas composition monitoring submodule are connected with the data processing unit through the data transmission line.

[0008] As a preferred scheme of the underground gasification reaction cavity real-time regulation system, the temperature sensor refers to a thermocouple sensor; the gas composition analyzer refers to a gas chromatograph, which is used to analyze the content of carbon monoxide, hydrogen, methane and carbon dioxide in the produced gas.

[0009] As a preferred scheme of the underground gasification reaction cavity real-time regulation system, the data processing unit adopts an industrial computer with built-in data analysis and processing software; the data analysis and processing software performs filtering processing on the received data to remove noise interference, and uses the established mathematical model to evaluate the state of the gasification reaction cavity; the state includes the combustion area of the cavity, the reaction activity, the gasification agent flow condition, the cavity sealing property and the gasification reaction degree.

[0010] As a kind of underground gasification reaction cavity real-time regulation system described in the application, a preferred scheme, wherein: the regulation module includes gasification agent flow regulation submodule, gasification agent component regulation submodule and cavity form regulation submodule;The gasification agent flow regulation submodule installs electric regulating valve on gasification agent delivery pipeline, for adjusting gasification agent flow;The gasification agent component regulation submodule is equipped with gas mixing device, for adjusting the proportion of each component in gasification agent;The cavity form regulation submodule is provided with several auxiliary gas injection wells around the gasification reaction cavity, for adjusting the growth direction and form of cavity;The gasification agent flow regulation submodule, gasification agent component regulation submodule and cavity form regulation submodule are connected with the data processing unit through control signal transmission line.

[0011] As a kind of underground gasification reaction cavity real-time regulation system described in the application, a preferred scheme, wherein: the auxiliary gas injection well includes injecting inert gas into the cavity specific area, and the inert gas is nitrogen;By controlling the gas injection pressure and flow of auxiliary gas injection well, the gas flow state and pressure distribution around the cavity are changed.

[0012] As a kind of underground gasification reaction cavity real-time regulation system described in the application, a preferred scheme, wherein: the components in the gasification agent include oxygen, water vapor and air;The gas mixing device adjusts the proportion of oxygen, water vapor and air in gasification agent in real time according to the instruction of data processing unit.

[0013] As a kind of underground gasification reaction cavity real-time regulation system described in the application, a preferred scheme, wherein: the data processing unit has data storage function, and the historical data transmitted by monitoring module is stored and managed.

[0014] As a kind of underground gasification reaction cavity real-time regulation system described in the application, a preferred scheme, wherein: the measurement accuracy of the pressure sensor is not less than 0.5%FS;The adjustment accuracy of the electric regulating valve is not less than 1%, and the response time is not more than 1 second.

[0015] The application provides a kind of underground gasification reaction cavity real-time regulation system.

[0016] To solve the above technical problems, the application provides the following technical scheme: a kind of underground gasification reaction cavity real-time regulation method, comprising: starting monitoring module, data processing unit and regulation module, the state of each type of sensor and data transmission line is checked, and gasification agent delivery system and auxiliary gas injection device are initialized;

[0017] The temperature data of different positions of the reaction cavity are acquired by a temperature sensor, the pressure data of the gasification agent injection well, the gas production well and the cavity interior are acquired by a pressure sensor, and the component data of the output gas are acquired by a gas component analyzer, and all the monitoring data are sent to a data processing unit; the data processing unit pre-processes the received temperature, pressure and gas component data, and evaluates the running state of the underground gasification reaction cavity based on an embedded model; control instructions are generated according to the evaluation results, the control instructions including adjustment instructions for the gasification agent flow, adjustment instructions for the gasification agent components and control instructions for the cavity shape; the control instructions are executed to control the electric regulating valve to adjust the gasification agent flow, control the gas mixing device to adjust the proportion of the gasification agent components, and inject nitrogen through the auxiliary gas injection device to control the cavity shape; after the control operation is executed, the monitoring data are continuously collected and fed back to the data processing unit, and the control strategy is updated to realize closed-loop control, and all the monitoring data and control records are stored in the data processing unit.

[0018] The application provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the real-time control method for the underground gasification reaction cavity when executing the computer program.

[0019] The application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the real-time control method for the underground gasification reaction cavity.

[0020] The application has the beneficial effects that: the application can accurately acquire the key parameters such as the temperature, the pressure and the gas component of the gasification reaction cavity through the comprehensive and real-time monitoring module, the sampling interval is short, the measurement precision is high, reliable data support is provided for accurate control, and the problem that the internal state information of the gasification reaction cavity is difficult to be grasped in real time in the prior art is effectively solved.

[0021] Based on the powerful data analysis and processing capacity of the data processing unit, the cavity state is evaluated by using a multidimensional mathematical model, the reaction condition can be quickly and accurately judged, and the gasification agent flow, the component and the cavity shape are accurately controlled according to the evaluation result through the control module, and the gasification reaction efficiency is significantly improved.

[0022] The system design of the application has good adaptability and scalability, can be flexibly adjusted and optimized according to different geological conditions (such as coal seam thickness 1-10 meters, coal seam inclination 0-30°) and gasification process requirements, and lays a solid foundation for large-scale industrial application of the underground coal gasification technology. At the same time, through accurate control, resource waste and environmental pollution are effectively reduced, and significant economic and environmental benefits are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] Figure 1 A framework diagram of a real-time regulation system of an underground gasification reaction cavity provided by an embodiment of the present application is shown in FIG. 1.

[0025] Figure 2 A general flowchart of a real-time regulation method of an underground gasification reaction cavity provided by an embodiment of the present application is shown in FIG. 2. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should be within the protection scope of the present application.

[0027] Embodiment 1, refer to Figure 1 For an embodiment of the present application, the embodiment provides a real-time regulation system of an underground gasification reaction cavity, which comprises a monitoring module, a data processing unit and a regulation module.

[0028] The monitoring module is connected with the data processing unit through a data transmission line, used for collecting the temperature, pressure and gas composition data of the gasification reaction cavity in real time, and transmitting the collected data to the data processing unit.

[0029] The data processing unit is connected with the regulation module through a control signal transmission line, used for processing and analyzing the received data, evaluating the state of the gasification reaction cavity, and sending a control instruction to the regulation module.

[0030] The regulation module regulates the gasification reaction process according to the control instruction.

[0031] Further, the monitoring module includes a temperature monitoring submodule, a pressure monitoring submodule, and a gas component monitoring submodule; the temperature monitoring submodule is arranged with multiple temperature sensors at different depths and positions around the gasification reaction cavity, for collecting temperature data of different regions of the cavity wall and interior; the pressure monitoring submodule is installed with pressure sensors at key positions inside the gasification agent injection well, the gas production well, and the gasification reaction cavity, for collecting pressure data; the gas component monitoring submodule is provided with a gas component analyzer at the outlet of the gas production well, for analyzing component data of the produced gas; the temperature monitoring submodule, the pressure monitoring submodule, and the gas component monitoring submodule are all connected to the data processing unit through a data transmission line.

[0032] Specifically, the temperature monitoring submodule includes multiple high-temperature-resistant and corrosion-resistant thermocouple sensors arranged at different depths and positions around the gasification reaction cavity, with an adjacent sensor spacing of 0.5-1.5 meters, covering depths from the top to the bottom of the cavity, for real-time collection of temperature data of different regions of the cavity wall and interior, with a measurement range of 0-1500℃. These sensors convert the temperature signals into 4-20mA electrical signals and transmit them to the data processing unit through armored cables.

[0033] The pressure monitoring submodule includes high-precision pressure sensors installed at the wellhead of the gasification agent injection well, the wellhead of the gas production well, and every 5 meters along the axial direction inside the gasification reaction cavity, with a measurement range of 0-5MPa, a measurement accuracy of not less than 0.5%FS, and real-time monitoring of pressure changes during the gasification process. The pressure sensors convert the pressure signals into 4-20mA electrical signals and transmit them to the data processing unit through shielded cables. The accuracy requirement (0.5%FS) of the pressure sensors is to meet the accuracy of the pressure monitoring of the gasification reaction cavity, and to provide reliable data for evaluating the flow state of the gasification agent and the sealing performance of the cavity (judgment of pressure gradient and fluctuation amplitude needs to be based on high-precision pressure data).

[0034] The gas component monitoring submodule includes a gas chromatograph as a gas component analyzer arranged at the outlet of the gas production well, with a detection lower limit of 0.01%, for real-time analysis of the components of the produced gas, including the contents of main components such as carbon monoxide (CO), hydrogen (H2), methane (CH4), and carbon dioxide (CO2), with an analysis cycle of not more than 30 seconds. The gas component analyzer transmits the analysis results to the data processing unit through an RS485 interface.

[0035] The present application can accurately obtain key parameters such as the temperature, pressure, and gas components of the gasification reaction cavity through comprehensive and real-time monitoring modules, with short sampling intervals and high measurement accuracy, providing reliable data support for precise regulation and control, and effectively solving the problem of difficult real-time monitoring of internal state information of the gasification reaction cavity in the prior art.

[0036] Further, the data processing unit is connected with the control module through a control signal transmission line, and a high-performance industrial computer is configured as an Intel Core i7 processor, 16 GB memory, 1 TB solid state disk, and a specially developed data analysis and processing software is built-in.

[0037] The data analysis and processing software first filters the temperature, pressure and gas composition data transmitted from the monitoring module, adopts a mean filtering algorithm, the filter window size can be adaptively adjusted within 3-10 sampling points according to the data fluctuation, removes noise interference, and improves the accuracy and reliability of the data.

[0038] Based on the filtered data, the established three-dimensional temperature field distribution model, pressure field distribution model and reaction kinetics model are used to evaluate the state of the gasification reaction cavity. The combustion region of the cavity (temperature higher than 1000℃ is the intense combustion zone, 800-1000℃ is the stable reaction zone, and lower than 800℃ is the weak reaction zone) and the reaction activity are determined by the temperature distribution data; the flow of the gasification agent (pressure gradient greater than 0.1 MPa / m is the high-speed flow zone) and the sealing of the cavity (pressure fluctuation amplitude more than 5% is considered abnormal) are analyzed according to the pressure change; the degree of gasification reaction (when CO+H2 content is greater than 60% and CH4 content is greater than 5%, it is considered that the reaction is sufficient) and the quality of the gas are determined by combining the gas composition data.

[0039] The evaluation of the state of the gasification reaction cavity includes the description of the temperature space-time distribution of the gasification reaction cavity based on the non-steady-state heat conduction equation, and the formula is:

[0040]

[0041] Wherein: is the density of the coal body (kg / m 3 ), c is the specific heat capacity of the coal body (J / (kg·K)), T(x,y,z,t) is the temperature at time t and coordinate (x,y,z) (K), k(T) is the thermal conductivity coefficient varying with temperature (W / (m·K)), is the gradient operator, and Q(x,y,z,t) is the heat source term of the gasification reaction (W / m 3 , determined by the reaction heat release rate).

[0042] At the same time, the data processing unit has a data storage function, and a SQL Server database is used to store and manage historical data, and the storage period is not less than 1 year, so as to facilitate subsequent query and analysis.

[0043] Based on the powerful data analysis and processing capability of the data processing unit, the cavity state is evaluated by using a multi-dimensional mathematical model, the reaction condition can be quickly and accurately judged, and the gasification agent flow, composition and cavity shape are accurately regulated through the regulation module according to the evaluation result, which significantly improves the gasification reaction efficiency. Compared with the traditional regulation method, the gasification reaction efficiency can be increased by more than 15%, and the fluctuation range of the gas production heat value is reduced to within ±5%.

[0044] Further, the regulation module includes a gasification agent flow regulation submodule, a gasification agent composition regulation submodule and a cavity shape regulation submodule; the gasification agent flow regulation submodule installs an electric regulating valve on the gasification agent delivery pipeline for regulating the gasification agent flow; the gasification agent composition regulation submodule is equipped with a gas mixing device for adjusting the proportion of each component in the gasification agent; the cavity shape regulation submodule sets a plurality of auxiliary gas injection wells around the gasification reaction cavity for adjusting the growth direction and shape of the cavity; the gasification agent flow regulation submodule, the gasification agent composition regulation submodule and the cavity shape regulation submodule are connected with the data processing unit through a control signal transmission line.

[0045] Specifically, the gasification agent flow regulation submodule includes an electric regulating valve installed on the gasification agent delivery pipeline, the regulation accuracy is not less than 1%, the response time is not more than 1 second, the 4-20mA control signal sent by the data processing unit is used to accurately regulate the flow of the gasification agent, and the flow regulation range is 0-1000m 3 / h. When it is monitored that the temperature of the gasification reaction cavity is too high (more than 1200℃), the electric regulating valve receives the instruction to reduce the gasification agent flow to reduce the reaction rate; on the contrary, when the temperature is too low (less than 800℃), the gasification agent flow is increased to improve the reaction activity. The regulation accuracy (1%) and response time (≤1 second) of the electric regulating valve are to realize the rapid and accurate regulation of the gasification agent flow to adapt to the dynamic changes of the cavity temperature and other parameters (such as rapidly reducing the flow when the temperature is too high, and timely increasing the flow when the temperature is too low).

[0046] The gasification agent composition regulation submodule includes a gas mixing device, which includes an oxygen tank, a water vapor generator and an air compressor, the input amount of each component is controlled by a mass flow controller, and the accuracy of the mass flow controller is ±0.2%FS. The proportions of oxygen (0%~30%), water vapor (0%~40%) and air (30%~100%) in the gasification agent can be adjusted in real time according to the instruction of the data processing unit. For example, when the carbon monoxide content in the produced gas is less than 20%, the proportion of oxygen is increased to 25%~30% to promote the incomplete combustion of coal and increase the amount of carbon monoxide; when it is necessary to increase the hydrogen content, the proportion of water vapor is appropriately increased to 30%~40% to promote the water gas reaction.

[0047] The cavity shape regulation sub-module includes 6-8 auxiliary gas injection wells uniformly arranged within a radius of 5-10 meters around the gasification reaction cavity, with a well depth consistent with the depth of the gasification reaction cavity. By injecting inert gas (such as nitrogen) into specific areas of the cavity through these injection wells, the injection pressure is adjusted within a range of 0.5-3 MPa, and the flow rate is adjusted within a range of 0-200 m 3 / h. When asymmetric growth (expansion speed in one direction is more than 30% faster than in other directions) or local reaction abnormalities are found in the gasification reaction cavity, the gas injection pressure and flow rate of the auxiliary gas injection wells are controlled to change the gas flow state and pressure distribution around the cavity, thereby adjusting the growth direction and shape of the cavity to make the gasification reaction more uniform and stable.

[0048] The system design of the present application has good adaptability and scalability, and can be flexibly adjusted and optimized according to different geological conditions (such as coal seam thickness of 1-10 meters and coal seam inclination of 0-30°) and gasification process requirements, laying a solid foundation for large-scale industrial application of underground coal gasification technology. At the same time, through precise control, resource waste (coal conversion rate increased to more than 90%) and environmental pollution (pollutant emissions reduced by more than 20%) are effectively reduced, with significant economic and environmental benefits.

[0049] Embodiment 2, refer to Figure 2 As an embodiment of the present application, the embodiment provides a real-time control method for an underground gasification reaction cavity, comprising:

[0050] S1, start the monitoring module, data processing unit and control module, check the state of various sensors and data transmission lines, initialize the gasification agent delivery system and auxiliary gas injection device.

[0051] S2, obtain temperature data at different positions of the reaction cavity through temperature sensors, obtain pressure data of the gasification agent injection well, gas production well and cavity interior through pressure sensors, and obtain component data of the output gas through a gas component analyzer, and all monitoring data are sent to the data processing unit.

[0052] S3, the data processing unit pre-processes the received temperature, pressure and gas component data, and evaluates the running state of the underground gasification reaction cavity based on the built-in model.

[0053] S4, generate control instructions according to the evaluation results, including adjustment instructions for gasification agent flow rate, adjustment instructions for gasification agent composition, and control instructions for cavity shape.

[0054] S5, execute the control instructions, control the electric regulating valve to adjust the gasification agent flow rate, control the gas mixing device to adjust the proportion of the gasification agent composition, and inject nitrogen through the auxiliary gas injection device to control the cavity shape.

[0055] S6, continue to collect monitoring data after performing the regulation operation, feed back to the data processing unit, update the regulation strategy to realize closed-loop control, and store all monitoring data and regulation records in the data processing unit.

[0056] Further, in step S1, the monitoring module (temperature, pressure, gas composition monitoring submodule), data processing unit and regulation module are started.

[0057] Check whether each sensor (thermocouple, pressure sensor, gas chromatograph) and data transmission line is working normally.

[0058] Initialize the gasification agent delivery system (electric regulating valve, gas mixing device) and auxiliary gas injection well.

[0059] Further, in step S2, temperature monitoring is performed by thermocouple sensors arranged at different depths and positions in the cavity, to collect real-time temperature data of the cavity wall and interior.

[0060] Pressure monitoring is performed by pressure sensors in the gasification agent injection well, gas production well and cavity interior, to collect real-time pressure data.

[0061] Gas composition monitoring is performed by a gas chromatograph at the outlet of the gas production well, to analyze the composition data of the produced gas (CO, H2, CH4, CO2, etc.) in real time.

[0062] All monitoring data are sent to the data processing unit in real time through the data transmission line.

[0063] Further, in step S3, the data processing unit performs filtering processing on the received data to remove noise interference.

[0064] Based on the built-in mathematical model, the state of the gasification reaction cavity is evaluated, including the combustion area distribution, reaction activity, gasification agent flow condition, cavity sealing, and gasification reaction degree.

[0065] Further, in step S4, according to the analysis results, the data processing unit generates regulation instructions, including gasification agent flow regulation (adjusting the flow rate through the electric regulating valve), gasification agent composition adjustment (adjusting the O2, water vapor, air ratio through the gas mixing device), and cavity shape regulation (injecting nitrogen through the auxiliary gas injection well to adjust the cavity growth direction and shape).

[0066] Further, in step S5, flow regulation includes adjusting the gasification agent flow rate through the electric regulating valve (adjustment accuracy ≥1%, response time ≤1s). Composition regulation includes dynamically adjusting the oxygen, water vapor, air ratio according to the instructions through the gas mixing device. Cavity shape regulation includes injecting nitrogen as needed through the auxiliary gas injection well to change the pressure distribution around the cavity and the gas flow state.

[0067] Further, after the regulation in step S6, the monitoring module continues to collect the latest data and feeds back to the data processing unit. The data processing unit evaluates the regulation effect and dynamically adjusts the control strategy if necessary, forming a closed-loop control.

[0068] All monitoring data and regulation records are stored in the data processing unit for subsequent query, trend analysis and optimization model.

[0069] After the gasification reaction is completed, the monitoring module, the regulation module and the data processing unit are gradually closed.

[0070] Regularly maintain the sensors (such as calibrate the thermocouple, pressure sensor) and the regulation equipment (such as check the sealing of the electric regulating valve).

[0071] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A real-time control system for an underground gasification reaction chamber, characterized in that: It comprises a monitoring module, a data processing unit and a control module; The monitoring module is connected with the data processing unit through a data transmission line, used for collecting the temperature, pressure and gas composition data of the gasification reaction cavity in real time and transmitting the collected data to the data processing unit; The data processing unit is connected with the control module through a control signal transmission line, used for processing and analyzing the received data, evaluating the state of the gasification reaction cavity and sending control instructions to the control module; The control module controls the gasification reaction process according to the control instructions.

2. The real-time control system for an underground gasification reaction chamber according to claim 1, wherein: The monitoring module comprises a temperature monitoring submodule, a pressure monitoring submodule and a gas composition monitoring submodule; The temperature monitoring submodule is arranged with multiple temperature sensors at different depths and positions around the gasification reaction cavity, used for collecting the temperature data of the cavity wall surface and different regions inside the cavity; The pressure monitoring submodule is installed with pressure sensors at the gasification agent injection well, the gas production well and the key positions inside the gasification reaction cavity, used for collecting the pressure data; The gas composition monitoring submodule is provided with a gas composition analyzer at the outlet of the gas production well, used for analyzing the composition data of the produced gas; The temperature monitoring submodule, the pressure monitoring submodule and the gas composition monitoring submodule are all connected with the data processing unit through a data transmission line.

3. The real-time control system for an underground gasification reaction chamber of claim 2, wherein: The temperature sensor refers to a thermocouple sensor; The gas composition analyzer refers to a gas chromatograph, used for analyzing the content of carbon monoxide, hydrogen, methane and carbon dioxide in the produced gas.

4. The real-time control system for an underground gasification reaction chamber of claim 3, wherein: The data processing unit adopts an industrial computer with built-in data analysis and processing software; The data analysis and processing software filters the received data to remove noise interference, and uses the established mathematical model to evaluate the state of the gasification reaction cavity; The state includes the combustion area of the cavity, the reaction activity, the gasification agent flow condition, the cavity sealing property and the gasification reaction degree.

5. The real-time control system for an underground gasification reaction chamber of claim 4, wherein: The control module comprises a gasification agent flow control submodule, a gasification agent composition control submodule and a cavity shape control submodule; The gasification agent flow control submodule is installed with an electric regulating valve on the gasification agent conveying pipeline, used for adjusting the gasification agent flow; The gasification agent composition control submodule is equipped with a gas mixing device, used for adjusting the proportion of each component in the gasification agent; The cavity shape control submodule is provided with several auxiliary gas injection wells around the gasification reaction cavity, used for adjusting the growth direction and shape of the cavity; The gasification agent flow control submodule, the gasification agent composition control submodule and the cavity shape control submodule are all connected with the data processing unit through a control signal transmission line.

6. The real-time control system for an underground gasification reaction chamber of claim 4, wherein: The auxiliary gas injection well comprises injecting inert gas, i.e. nitrogen, into a specific region of the cavity; By controlling the gas injection pressure and flow of the auxiliary gas injection well, the gas flow state and pressure distribution around the cavity can be changed.

7. The real-time control system for an underground gasification reaction chamber of claim 4, wherein: Each component in the gasification agent comprises oxygen, water vapor and air; The gas mixing device adjusts the proportion of oxygen, water vapor and air in the gasification agent in real time according to the instructions of the data processing unit.

8. The real-time control system for an underground gasification reaction chamber of claim 4, wherein: The data processing unit has a data storage function, used for storing and managing the historical data transmitted by the monitoring module.

9. The real-time control system for an underground gasification reaction chamber of claim 4, wherein: The measurement accuracy of the pressure sensor is not less than 0.5% FS; The regulating precision of the electric regulating valve is not less than 1%, and the response time is not more than 1 second.

10. A real-time control method of an underground gasification reaction cavity, using a real-time control system of an underground gasification reaction cavity according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: Start the monitoring module, data processing unit and regulation module, check the state of various sensors and data transmission lines, initialize the gasifying agent delivery system and auxiliary gas injection device; Obtain temperature data of different positions of the reaction cavity through the temperature sensor, obtain pressure data of the gasifying agent injection well, gas production well and cavity interior through the pressure sensor, and obtain component data of the output gas through the gas component analyzer, and send all monitoring data to the data processing unit; The data processing unit pre-processes the received temperature, pressure and gas component data, and evaluates the running state of the underground gasification reaction cavity based on the built-in model; Generate regulation instructions according to the evaluation results, which include regulating instructions for gasifying agent flow, adjusting instructions for gasifying agent components and regulating instructions for cavity shape; Execute the regulation instructions to control the electric regulating valve to adjust the gasifying agent flow, control the gas mixing device to adjust the proportion of the gasifying agent components, and inject nitrogen through the auxiliary gas injection device to regulate the cavity shape; After executing the regulation operation, continue to collect monitoring data, feed back to the data processing unit, update the regulation strategy to realize closed-loop control, and store all monitoring data and regulation records in the data processing unit.

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