Gas and spontaneous combustion composite risk management system based on adaptive regulation of ventilation state

Abstract

This invention provides a gas and spontaneous combustion combined risk management system based on adaptive ventilation status control, relating to the field of industrial control. The system acquires spatial structure, ventilation facilities, ventilation status, gas monitoring, and spontaneous combustion monitoring data of the target mine area, divides the target mine area into multiple ventilation response zones and establishes ventilation connection relationships; it separately determines a first gas risk zone, a second spontaneous combustion risk zone, and a third combined risk zone; it determines the corresponding ventilation adjustment needs based on gas discharge requirements and oxygen supply limitation requirements, and determines the target ventilation adjustment zone and ventilation direction based on the spatial location and ventilation connection relationships of the three types of risk zones; it matches the corresponding ventilation facilities and adjusts the fan operating parameters, damper opening, or adjustable window opening; after ventilation adjustment, it reacquires monitoring data for each zone, and corrects the target ventilation adjustment zone, ventilation direction, and ventilation facility control parameters based on the newly determined three types of risk zones and their spatial location relationships.

Description

Technical Field

[0001] This invention relates to the field of industrial control technology, specifically to a combined risk management system for gas and spontaneous combustion based on adaptive control of ventilation status. Background Technology

[0002] During coal mining, the ventilation conditions in areas such as the working face, upper corner, return airway, and goaf directly affect gas migration and the oxidation process of residual coal. Gas control typically requires increasing effective air volume, improving return air conditions, or adjusting local airflow distribution to ensure timely gas discharge to the return air side. Conversely, controlling spontaneous combustion of residual coal in the goaf requires restricting oxygen-containing airflow into the goaf, reducing air leakage intensity, and decreasing the air pressure difference between the inlet and return air sides. Since the ventilation adjustment requirements for gas risk and spontaneous combustion risk may differ, the same ventilation adjustment measure, while reducing gas concentration in a certain area, may increase air leakage and oxygen supply in the goaf, thus creating a mutually restrictive relationship between the two types of risks.

[0003] Existing mine ventilation management methods and industrial ventilation control methods typically determine gas anomalies and spontaneous combustion anomalies based on monitoring data such as gas concentration, carbon monoxide concentration, temperature, or oxygen concentration. Once the corresponding judgment conditions are met, measures such as increasing air volume, adjusting fan operating parameters, regulating dampers, or limiting air leakage are taken. This type of method primarily determines the ventilation adjustment range based on the magnitude of risk parameters, without adequately considering the specific locations of the primary gas risk area and the secondary spontaneous combustion risk area within the mine ventilation network, the ventilation connection between them, and whether the corresponding air adjustment demand applies to the same ventilation path. When gas risk and spontaneous combustion risk occur simultaneously, if an overall increase or decrease in ventilation is still adopted, one risk may be mitigated while the other is adversely affected. Furthermore, after existing ventilation adjustment measures are implemented, the control basis is usually whether the parameters of the target monitoring point recover, lacking a feedback process to re-determine the target ventilation adjustment area and direction based on changes in the location of the risk area. Therefore, it is difficult to develop a ventilation control method that matches the spatial location for combined gas and spontaneous combustion risks. Summary of the Invention

[0004] The purpose of this invention is to provide a gas and spontaneous combustion combined risk management system based on adaptive ventilation status control, so as to solve the problem in the above-mentioned background technology that it is difficult to match the ventilation control method with the spatial location to the formation of gas and spontaneous combustion combined risks.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A combined risk management system for gas and spontaneous combustion based on adaptive ventilation status control includes: The ventilation status acquisition module is used to acquire spatial structure information, ventilation facility information, ventilation status data, gas monitoring data and spontaneous combustion monitoring data of the target mine area. Based on the spatial structure information and ventilation facility information, the target mine area is divided into multiple ventilation response zones, and ventilation connection relationships between each ventilation response zone are established. The composite risk analysis module is used to determine the first gas risk area based on the gas monitoring data of each ventilation response area, and the second spontaneous combustion risk area based on the spontaneous combustion monitoring data of each ventilation response area. When the same ventilation response area is simultaneously determined as the first gas risk area and the second spontaneous combustion risk area, and the corresponding gas ventilation adjustment demand and spontaneous combustion ventilation adjustment demand act on the same ventilation path and have opposite ventilation adjustment directions, the ventilation response area is determined as the third composite risk area. The module determines the gas ventilation adjustment demand based on the gas exhaust demand corresponding to the first gas risk area, the spontaneous combustion ventilation adjustment demand based on the oxygen supply restriction demand corresponding to the second spontaneous combustion risk area, and determines the composite risk ventilation conflict state based on the ventilation adjustment directions of the gas ventilation adjustment demand and the spontaneous combustion ventilation adjustment demand. Based on the first gas risk area, the second spontaneous combustion risk area, the third composite risk area, and the corresponding ventilation connection relationship, the module determines the target ventilation adjustment area and the corresponding ventilation adjustment direction, forming a regional ventilation adjustment strategy. The adaptive air conditioning module is used to determine the ventilation facilities and ventilation adjustment parameters corresponding to the target air conditioning area according to the regional air conditioning strategy, and to adjust the corresponding ventilation facilities to change the air volume, air pressure or airflow distribution state of the target air conditioning area. The feedback correction module is used to reacquire ventilation status data, gas monitoring data, and spontaneous combustion monitoring data of each ventilation response area after the regional ventilation adjustment strategy is implemented, redetermine the first gas risk area and the second spontaneous combustion risk area, and redetermine or cancel the third composite risk area according to the overlap of the two types of risk areas and the ventilation adjustment needs; and adjust the target ventilation adjustment area or the corresponding ventilation adjustment direction according to the redetermined first gas risk area, second spontaneous combustion risk area, third composite risk area and corresponding ventilation connection relationship.

[0006] Compared with the prior art, the beneficial effects of the present invention are: This invention divides the target mine area into multiple ventilation response zones based on the locations of intake airways, coal faces, upper corners, return airways, goaf boundaries, and ventilation facilities. It establishes upstream, downstream, and adjacent ventilation connections between these zones based on actual airflow direction. Furthermore, it determines a first gas risk zone based on gas monitoring results, a second spontaneous combustion risk zone based on spontaneous combustion monitoring results, and a third composite risk zone for ventilation response zones exhibiting both types of risks and conflicting ventilation demands. This allows monitoring results such as gas concentration, carbon monoxide concentration, oxygen concentration, temperature, airflow, and air pressure to be mapped to different risk attributes and specific ventilation locations. By forming three types of risk zones and their spatial connections, this invention provides a basis for subsequently distinguishing between single gas discharge, single spontaneous combustion oxygen supply limitation, and composite conflict states, improving the correspondence between composite risk analysis results and the actual mine ventilation structure.

[0007] This invention determines gas ventilation requirements based on the gas risk status of a first gas risk area and its ventilation connection to the return air side, and determines spontaneous combustion ventilation requirements based on the spontaneous combustion risk status of a second spontaneous combustion risk area and its ventilation connection to the air intake side. When the same ventilation response area simultaneously has two types of risks, and the two types of ventilation requirements act on the same ventilation path and have opposite airflow adjustment directions, it is identified as a third composite risk area. Based on this, a local ventilation path that can enhance the exhaust to the return air side of this area without increasing spontaneous combustion oxygen supply is found. By further dividing ordinary risk areas into first gas risk areas, second spontaneous combustion risk areas, and third composite risk areas, this invention improves the matching degree between local ventilation direction and gas exhaust requirements and spontaneous combustion oxygen supply restriction requirements, ensuring that the determination of target ventilation areas is based not only on the magnitude of risk parameters but also on the overlap of risk attributes and conflicting ventilation directions.

[0008] This invention implements independent regional air conditioning when there is no ventilation conflict between the first gas risk zone and the second spontaneous combustion risk zone. When a third composite risk zone is formed, it maintains the oxygen supply airflow in the intake path of the second spontaneous combustion risk zone without increasing it, and selects ventilation facilities between the third composite risk zone and the return air side that are not part of the intake path of the second spontaneous combustion risk zone for localized directional air conditioning. After air conditioning, the air volume, air pressure, gas concentration, carbon monoxide concentration, oxygen concentration, and temperature of the target air conditioning zone and adjacent zones are acquired again to reassess the maintenance, transformation, or elimination status of the three types of risk zones, and adjusts the target air conditioning zone, air conditioning direction, and ventilation facility control parameters accordingly. This invention improves the adaptability of ventilation control parameters to changes in the composite risk space by feeding back changes in risk zone types to subsequent air conditioning processes. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall system flow of the present invention; Figure 2 This is a schematic diagram illustrating the division of ventilation response zones and ventilation connection relationships in the target mine area according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the identification of the first gas risk zone, the second spontaneous combustion risk zone, and the third composite risk zone, as well as the regional airflow adjustment direction, in an embodiment of the present invention. Figure 4 This is a schematic diagram comparing the non-ventilation conflict state and the ventilation conflict state in an embodiment of the present invention. Detailed Implementation

[0010] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0011] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0012] Please see Figures 1 to 4 The present invention provides a technical solution: A combined risk management system for gas and spontaneous combustion based on adaptive ventilation status control is characterized by comprising: The ventilation status acquisition module is used to acquire spatial structure information, ventilation facility information, ventilation status data, gas monitoring data and spontaneous combustion monitoring data of the target mine area. Based on the spatial structure information and ventilation facility information, the target mine area is divided into multiple ventilation response zones, and ventilation connection relationships between each ventilation response zone are established. The composite risk analysis module is used to determine the first gas risk area based on the gas monitoring data of each ventilation response area, and the second spontaneous combustion risk area based on the spontaneous combustion monitoring data of each ventilation response area. When the same ventilation response area is simultaneously determined as the first gas risk area and the second spontaneous combustion risk area, and the corresponding gas ventilation adjustment demand and spontaneous combustion ventilation adjustment demand act on the same ventilation path and have opposite ventilation adjustment directions, the ventilation response area is determined as the third composite risk area. The module determines the gas ventilation adjustment demand based on the gas exhaust demand corresponding to the first gas risk area, the spontaneous combustion ventilation adjustment demand based on the oxygen supply restriction demand corresponding to the second spontaneous combustion risk area, and determines the composite risk ventilation conflict state based on the ventilation adjustment directions of the gas ventilation adjustment demand and the spontaneous combustion ventilation adjustment demand. Based on the first gas risk area, the second spontaneous combustion risk area, the third composite risk area, and the corresponding ventilation connection relationship, the module determines the target ventilation adjustment area and the corresponding ventilation adjustment direction, forming a regional ventilation adjustment strategy. The adaptive air conditioning module is used to determine the ventilation facilities and ventilation adjustment parameters corresponding to the target air conditioning area according to the regional air conditioning strategy, and to adjust the corresponding ventilation facilities to change the air volume, air pressure or airflow distribution state of the target air conditioning area. The feedback correction module is used to reacquire ventilation status data, gas monitoring data, and spontaneous combustion monitoring data of each ventilation response area after the regional ventilation adjustment strategy is implemented, redetermine the first gas risk area and the second spontaneous combustion risk area, and redetermine or cancel the third composite risk area according to the overlap of the two types of risk areas and the ventilation adjustment needs; and adjust the target ventilation adjustment area or the corresponding ventilation adjustment direction according to the redetermined first gas risk area, second spontaneous combustion risk area, third composite risk area and corresponding ventilation connection relationship.

[0013] To clarify the technical solution, processing procedure, and relationships between the lower-level parameters of this invention, the specific implementation methods of this invention are described below in conjunction with specific application scenarios. The thresholds, sampling periods, facility opening levels, and fan operating parameters in the following embodiments are used to illustrate the implementation process of this invention and are not intended to limit the scope of protection; different mines can calibrate the corresponding parameters based on mine ventilation design, historical monitoring data, special test results, and on-site safety management requirements.

[0014] This invention is applied to a complex disaster management scenario in coal mining faces where the main ventilation path is formed by an intake airway, a coal face, an upper corner, and a return airway, and where there is air leakage on both the intake and return sides of the goaf. This embodiment uses a U-shaped fully mechanized longwall face as an example. The face is approximately 180m long, with the intake and return airways connected to both ends. The goaf is located behind the face. Gas sensors, carbon monoxide sensors, oxygen sensors, temperature sensors, wind speed sensors, and wind pressure acquisition devices are installed on the face. Corresponding monitoring points are set at the upper corner, near the return airway, on the intake side of the goaf, inside the goaf, and on the return air side of the goaf. Adjustable air windows are installed on the return air side, adjustable air doors are installed on the intake side of the goaf, and a controllable local exhaust branch is installed from the shallow part of the goaf to the return air side. The system does not use "increased gas concentration equals increased airflow" as the only control method. Instead, it first determines the spatial location of gas risk and spontaneous combustion risk and their corresponding airflow direction. When the two types of needs conflict, it prioritizes changing the local airflow distribution.

[0015] In this embodiment, the ventilation response areas within the target mine area are sequentially numbered V01 to V08, where V01 is the working face ventilation response area, V02 is the upper corner ventilation response area, V03 and V04 are the return air ventilation response areas, V05 is the goaf intake side response area, V06 and V07 are the goaf internal response areas, and V08 is the goaf return air side response area; the intake side boundary node outside the target area is denoted as... The return air side boundary node is denoted as The main ventilation path is... The air leakage path in the goaf is Meanwhile, there is a shallow local exhaust branch in the goaf between V06 and V08, which is used to form a local exhaust path that does not pass through the deep second spontaneous combustion risk area of ​​V07 under the condition of complex risk conflict.

[0016] Example 1 This embodiment corresponds to the ventilation status acquisition module, which is used to acquire spatial structure information, ventilation facility information, ventilation status data, gas monitoring data, and spontaneous combustion monitoring data of the target mine area. Based on the spatial structure information and ventilation facility information, it completes the division of ventilation response areas and establishes the ventilation connection relationship between each ventilation response area. The ventilation status acquisition module includes an area division unit and a status acquisition unit, and the specific execution process is as follows.

[0017] S101. Obtain spatial structure information of the target mine area. The area division unit reads the mine ventilation system diagram, mining engineering plan, and on-site roadway measurement results to obtain the intake airway, coal face, upper corner, return airway, goaf boundary, roadway cross-sectional dimensions, and actual connection locations between each area. For the goaf interior, based on the locations of pre-deployed bundle tube monitoring points, temperature monitoring points, and differential pressure monitoring points, the goaf is divided along the direction from the intake side to the return air side into the intake side, shallow interior, deep interior, and return air side, so that subsequent risk locations can fall into a clearly defined ventilation response area.

[0018] S102. Obtain ventilation facility information. The status acquisition unit reads the facility number, ventilation path, current operating parameters, allowable adjustment range, and control interface status of the main ventilation fan, return air side regulating window, goaf intake side regulating damper, and local exhaust branch regulating window. In this embodiment, the return air side regulating window on the V02 to V03 path is denoted as F01, and the return air roadway regulating window on the V03 to V04 path is denoted as F02. The regulating damper at the air inlet of V05 is designated as F03, and the regulating windows on the local exhaust branches from V06 to V08 are designated as F04; the main ventilation fan is designated as F05. F01 to F04 can all receive opening control commands, and F05 can receive frequency control commands.

[0019] S103. Acquire ventilation status data for each ventilation response zone. The status acquisition unit reads the wind speed, air volume, and air pressure of each zone at a 1-minute sampling cycle. For monitoring sections with installed air volume sensors, the cross-sectional air volume output by the sensors is directly used; for monitoring sections where only the average cross-sectional wind speed is acquired, the air volume is calculated based on the effective cross-sectional area. The average wind speed in each ventilation response zone is denoted as The effective ventilation cross-sectional area is recorded as Air volume is recorded as ,but: In the formula, The unit is m³ / s. The unit is m / s. The unit is m². For the connection path between regions, the wind pressure at the upstream pressure measurement point is denoted as... The wind pressure at the downstream pressure measurement point is recorded as The wind pressure difference along the corresponding path is denoted as ,but: In the formula, , and The units for both are Pa. Air volume and air pressure difference are used together to describe the current airflow direction and the ventilation status before facility adjustments.

[0020] S104. Acquire gas monitoring data and spontaneous combustion monitoring data. The status acquisition unit acquires gas concentration, carbon monoxide concentration, oxygen concentration, and temperature at the same timestamp as the ventilation status data. Gas concentration is expressed as a volume fraction; carbon monoxide concentration is expressed as ppm; oxygen concentration is expressed as a volume fraction; and temperature is expressed as degrees Celsius. For situations where multiple monitoring points exist in the same area, they are first numbered according to their cross-sectional location. Then, the spatial location corresponding to abnormal monitoring points is retained within the area, avoiding the loss of abnormal locations due to simple averaging of multiple monitoring points.

[0021] S105. Delineate ventilation response zones. The zone division units are the two ends of the working face, the upper corner, the monitoring section of the return airway, the intake side boundary of the goaf, the internal monitoring zone of the goaf, and the return air side boundary of the goaf, dividing the target mine area into V01 to V08. Although V03 and V04 both belong to the return air ventilation response zone, they are considered independent ventilation response zones because of the F02 regulating air window between them. Although V06 and V07 both belong to the internal response zone of the goaf, they are at different leakage depths, and V06 can form a local exhaust branch with V08 through F04; therefore, they are retained separately.

[0022] S106. Establish ventilation connection relationships. Based on the on-site tracer gas test results, wind speed direction, and pressure difference direction between each monitoring point, a directional ventilation connection diagram is established for the zone division unit. The set of ventilation response zones is denoted as... The set of inter-regional paths with direct airflow connectivity is denoted as The ventilation connection relationship of the target area is then represented as follows: For any two ventilation response zones and The connection tag is recorded as ,but: Depend on A ventilation connection matrix is ​​formed. The system simultaneously records the upstream area, downstream area, and adjacent area of ​​each region; in the subsequent embodiment two, the spatial relationship is not reconstructed, but the ventilation connection diagram formed in this embodiment is directly used as the basis for the gas exhaust path, the self-ignition oxygen supply path, and the local ventilation adjustment path.

[0023] The representative regional samples collected in this embodiment are shown in Table 1.

[0024] Table 1: Sample Table of Ventilation Response Zone Status Data Acquisition and Connection Relationship As shown in Table 1, V01 to V04 form the main ventilation chain from the working face to the return air side, while V05 to V08 form the air leakage chain in the goaf. V06 connects to both V07 and V08, with V06 to V08 being shallow, localized exhaust branches that can be adjusted via F04. This connection structure allows the system to select the localized path "V06 to V08," which does not enter the deep area of ​​V07, instead of simply increasing the total air volume of the entire working face when a conflict arises between gas and spontaneous combustion ventilation requirements.

[0025] Please refer to Figure 2 , Figure 2 The diagram shows the boundary nodes on the air intake side, the boundary nodes on the air return side, the main ventilation fan F05, the regulating window on the air return side F01, the regulating window on the air return roadway F02, the regulating damper on the air intake side of the goaf F03, the regulating window on the local exhaust branch F04, as well as the main ventilation airflow path between each ventilation response area from V01 to V08, the goaf leakage airflow chain, and the shallow local exhaust branch.

[0026] This embodiment completes the unified spatial index and ventilation connection relationship required for subsequent risk analysis, so that gas anomalies, spontaneous combustion anomalies and ventilation facilities can all be located in clear areas and paths, and the status data of V01 to V08 are used as input for Embodiment 2.

[0027] Example 2 This embodiment corresponds to a composite risk analysis module, which receives the ventilation response area, ventilation connection diagram, and synchronous monitoring data generated in Embodiment 1. It determines the first gas risk area and the second spontaneous combustion risk area, and further determines a third composite risk area when both types of risks exist simultaneously in the same ventilation response area and their corresponding ventilation adjustment needs conflict. This generates gas ventilation adjustment needs and spontaneous combustion ventilation adjustment needs, determines whether there is a composite risk ventilation conflict, and formulates a regional ventilation adjustment strategy based on the spatial location and ventilation connection relationship of the three types of risk areas. The composite risk analysis module includes a first gas risk area determination unit, a second spontaneous combustion risk area determination unit, a ventilation adjustment need determination unit, a ventilation conflict judgment unit, and a ventilation adjustment area determination unit. The specific execution process is as follows.

[0028] S201. Calculate the gas concentration growth rate. The first gas risk area determination unit acquires the gas concentration of each ventilation response area according to a 1-minute sampling cycle. The... The first region The gas concentration at each sampling time is recorded as . The number of sampling intervals contained in the review window is denoted as The sampling period is denoted as The gas concentration growth rate is denoted as ,but: This embodiment takes , The methane concentration growth rate reflects the average rate of change over the past 5 minutes, expressed as % / min. A result less than 0 indicates a decreasing methane concentration; only the positive growth portion is considered as the risk level when assessing methane risk. When assessing risk for the current sampling period, the methane concentration at the k-th sampling time is used. and Let them be denoted as C G,i and g G,i ; S202, Obtain the duration of the gas determination value. Record the gas determination value as... .when Continuous not less than Record the number of consecutive sampling points. The duration after reaching the gas detection value is recorded as ,but: ; This embodiment will Take 0.80% as the determination value for gas growth rate. Set the duration to 0.02% / min. Take 10 minutes. The above values ​​are used as advance control values ​​in this embodiment to illustrate the process of regional ventilation adjustment by the system before the conditions for further safety measures in the mine are met.

[0029] S203. Determine the gas risk status and the first gas risk zone. To ensure that gas concentration, growth rate, and duration are all considered in the determination, these three parameters are converted into dimensionless state quantities: ; ; ; Where, x C,i x is the characteristic value of the gas concentration in the i-th ventilation response zone, used to characterize the degree to which the current gas concentration approaches or exceeds the gas judgment value; g,i x is the characteristic value of gas concentration growth in the i-th ventilation response zone, used to characterize the degree to which the gas concentration growth rate approaches or exceeds the gas growth rate judgment value; T,i , is the gas duration characteristic value of the i-th ventilation response zone, used to characterize the degree to which the duration after the gas concentration reaches the gas judgment value is close to or exceeds the duration judgment value; The first The gas risk status value of each region is denoted as follows: ,but: when At that time, the corresponding ventilation response area will be designated as the first gas risk area; simultaneously, when and or At that time, it also directly enters the first gas risk zone. By adopting the above two triggering methods, the delay in entering the ventilation adjustment process can be avoided when the concentration has reached the judgment value and continues to increase because the weighted result is slightly less than 1.

[0030] S204, obtain the carbon monoxide growth state, temperature rise state, and oxygen consumption state. The first... The carbon monoxide concentration in each region is denoted as . Temperature is recorded as . recent The carbon monoxide concentration growth rate at each sampling interval and temperature rise rate They are respectively: ; ; The reference oxygen concentration on the air intake side is denoted as... , No. The oxygen concentration in each region is denoted as The oxygen consumption state quantity is denoted as ,but: In this embodiment . The oxygen consumption state quantity is used to describe the degree of decrease in oxygen concentration in the corresponding area relative to the reference oxygen concentration on the air intake side. It is a dimensionless quantity and is not used alone as a conclusion on spontaneous combustion risk. Instead, it is used in conjunction with CO concentration, CO growth, and temperature rise state for judgment.

[0031] S205, Determine the spontaneous combustion risk status and the second spontaneous combustion risk zone. This embodiment uses the carbon monoxide concentration determination value. Take 24 ppm as the determination value for carbon monoxide growth rate. Take 0.60 ppm / min as the oxygen consumption status judgment value. Set the temperature rise rate judgment value to 0.10. Take a speed of 0.08℃ / min. The following are formed respectively: ; ; ; ; Among them, y CO,i y is the carbon monoxide concentration characteristic value of the i-th ventilation response zone, used to characterize the degree to which the current carbon monoxide concentration in that zone approaches or exceeds the carbon monoxide concentration judgment value; gCO,i y is the characteristic value of carbon monoxide concentration growth in the i-th ventilation response area, used to characterize the degree to which the carbon monoxide concentration growth rate in this area approaches or exceeds the carbon monoxide growth rate determination value; O,i y is the oxygen consumption characteristic value of the i-th ventilation response zone, used to characterize the degree to which the oxygen consumption state of this zone approaches or exceeds the oxygen consumption state judgment value; T,i The temperature rise characteristic value of the i-th ventilation response zone is used to characterize the degree to which the temperature rise rate of this zone approaches or exceeds the temperature rise rate judgment value. In this embodiment, 1.5 is used as the cutoff upper limit for the gas risk characteristic value and the spontaneous combustion risk characteristic value to limit the continuous amplification effect of a single monitoring parameter exceeding the corresponding judgment value on the comprehensive risk status value. The weights of each item in the gas risk status value and the spontaneous combustion risk status value are calibrated based on the historical normal working conditions, abnormal gas working conditions, abnormal spontaneous combustion working conditions, and special test samples of the target mine, and the sum of the weights corresponding to the same risk status value is 1. In this embodiment, the listed weights are used to illustrate the specific calculation process.

[0032] The first The spontaneous combustion risk status value of each region is denoted as follows: ,but: when When the corresponding ventilation response area is identified as the second spontaneous combustion risk area; when and or At the same time, it directly enters the second spontaneous combustion risk zone. The system simultaneously records whether the second spontaneous combustion risk zone is located on the air intake side, shallow part, deep part, or return air side of the goaf, so as to select the oxygen supply restriction path later.

[0033] S206. Determine the gas ventilation adjustment requirements and spontaneous combustion ventilation adjustment requirements. For the first gas risk area, the direction to enhance its exhaust capacity to the return air side is denoted as... The degree of gas and air conditioning demand is recorded as ,but: For the second spontaneous combustion risk area, the direction of the oxygen supply airflow restricting entry into this area will be denoted as... The degree of spontaneous combustion ventilation demand is recorded as ,but: in, and Used to determine the facility adjustment range in Example 3. and Used to determine if the airflow direction is reversed. For the V02 first gas risk zone, the preferred gas discharge path is V02→V03→V04; for the V06 first gas risk zone, under the current airflow conditions, there is a discharge path V06→V07→V08→V02→V03, and there is also a partial bypass V06→V08→V02→V03 that can be adjusted by F04. For the V07 second spontaneous combustion risk zone, its main oxygen supply path is... →V05→V06→V07.

[0034] For any first gas risk area, taking the first gas risk area as the starting node and the return air side boundary node O0 as the ending node, the accessible ventilation paths are searched step by step along the directed ventilation connection diagram established in Example 1 according to the actual airflow direction. The connecting edges between the regions contained in each accessible ventilation path are used to form a candidate air-adjusting path edge set for the first gas risk area. For any second spontaneous combustion risk area, taking the air inlet side boundary node I0 as the starting node and the second spontaneous combustion risk area as the ending node, the accessible ventilation paths that can enter the second spontaneous combustion risk area are searched along the directed ventilation connection diagram according to the actual airflow direction. The connecting edges between the corresponding regions are used to form a set of oxygen supply restriction path edges for the second spontaneous combustion risk area.

[0035] S207. Determine the third composite risk area and assess the ventilation conflict status of the composite risk area. Denote the set of candidate ventilation path edges for the p-th first gas risk area as... Let the set of oxygen supply restriction path edges in the q-th second spontaneous combustion risk area be denoted as When two ventilation systems share a common path and their ventilation directions are opposite, it is identified as a complex risk ventilation conflict state. For the same ventilation response area, if it is simultaneously identified as the first gas risk area and the second spontaneous combustion risk area, and the gas ventilation demand and spontaneous combustion ventilation demand corresponding to this area act on the same ventilation path and in opposite ventilation directions, this ventilation response area is further identified as a third complex risk area. The conflict is marked as... ,but: in, Marking the direction of gas ventilation. Marking the direction of spontaneous combustion ventilation; The meaning is that the air adjustment directions of the two are opposite; in this embodiment, V06 meets both the gas risk assessment condition and the spontaneous combustion risk assessment condition; if the exhaust flow rate of V06 is directly increased along V06→V07→V08, the air volume of the connecting section V06→V07, which is also part of the oxygen supply path of V07, will increase, and the spontaneous combustion control requirements of V07 require limiting the oxygen supply of this section, therefore The system is identified as being in a state of complex risk ventilation conflict. The gas exhaust demand of V02 can be independently enhanced along the V02→V03→V04 path without the need to increase oxygen supply from V07.

[0036] Among them, K pq K is a composite risk ventilation conflict marker between the p-th first gas risk zone and the q-th second spontaneous combustion risk zone, with a value of 0 or 1; pq =1 indicates that the corresponding paths of the two have a common connection edge and the wind direction is opposite, K pq =0 indicates that the ventilation conflict did not occur.

[0037] S208. Determine the target ventilation adjustment area and corresponding ventilation adjustment direction. In non-ventilation conflict situations, directly designate the risk area and its directly connected risk management path as the target ventilation adjustment area. For cases where only V02 gas risk exists, determine V02, V03, and the V02→V03 path as the target ventilation adjustment area, with the ventilation direction being enhanced exhaust to the return air side; for cases where only V07 spontaneous combustion risk exists, designate V05, V06, and... The oxygen supply path →V05→V06→V07 is determined as the target air adjustment area, and the air adjustment direction is to reduce air leakage into V07.

[0038] In the case of a complex risk ventilation conflict, instead of continuing to increase airflow along the V06→V07 direction, a local path is selected from the ventilation connection diagram of Example 1 that can change the airflow state of the third complex risk area without increasing oxygen supply to V07. In this example, V06 is identified as the third complex risk area, and V06→V08→V02→V03 is selected as the local exhaust path for V06. V06, V08, V02, V03 and their corresponding connection paths are defined as the first target air conditioning area, with the air conditioning direction being to enhance the exhaust airflow from V06 to the return air side via V08. At the same time, the air leakage inlet →V05 is designated as the second target air conditioning area, with the air conditioning direction being to restrict new airflow from entering V05, V06, and V07. This forms a regional air conditioning strategy of "enhanced local exhaust airflow in the third complex risk area + oxygen supply restriction in the second spontaneous combustion risk area".

[0039] From the candidate ventilation paths from the third composite risk area to the return air side, exclude those requiring increased oxygen supply to the second spontaneous combustion risk area, and determine the remaining candidate ventilation paths as optional local ventilation paths. When multiple optional local ventilation paths exist, prioritize the path containing adjustable ventilation facilities and having fewer connecting edges. Please refer to... Figure 3 and Figure 4 , Figure 3 The diagram shows the direction of gas emission increase corresponding to the first gas risk zone, the direction of oxygen supply restriction corresponding to the second spontaneous combustion risk zone, and the direction of local directional air adjustment corresponding to the third composite risk zone. It also shows the relationship between adjusting the target air adjustment zone through F01, F03, and F04. Figure 4 The diagram on the left shows independent air conditioning in a non-ventilation conflict state, while the diagram on the right shows local directional air conditioning in a ventilation conflict state. This is used to illustrate the independent air conditioning method when there is no conflict between the first gas risk area and the second spontaneous combustion risk area, as well as the air conditioning method to achieve compound risk management by local bypass exhaust and limiting new air leakage when a third compound risk area is formed.

[0040] The calculation results of risk status and wind diversion demand in each region are shown in Table 2 and Table 2-1.

[0041] Table 2: Sample Table of Composite Risk Status and Wind Control Demand Table 2-1: Sample Table for Recalculation of Lower-Level Parameters of Spontaneous Combustion Risk As shown in Table 2-1, the carbon monoxide concentration growth rate, oxygen consumption state quantity, and temperature rise rate from V01 to V08 are all used as lower-level input parameters for the spontaneous combustion risk state value. By combining the carbon monoxide concentration in Table 2 and the calculation relationship described in S205, the corresponding spontaneous combustion risk state value can be recalculated.

[0042] As shown in Table 2, V02 is identified as the first gas risk area, and V07 and V08 are identified as the second spontaneous combustion risk areas. V06 simultaneously meets the criteria for both the first and second spontaneous combustion risk areas, and its gas emission increase demand and the spontaneous combustion oxygen supply restriction demand formed via the V06→V07 direction act on the common ventilation path in opposite directions. Therefore, it is further identified as the third composite risk area. For V06, the system does not perform overall ventilation increase, but instead uses the shallow local exhaust branch from V06 to V08 as an alternative path, and simultaneously restricts the leakage inlet from →V05. This result serves as the input for the facility matching and control parameter calculation in Example 3.

[0043] Example 3 This embodiment corresponds to an adaptive air conditioning module, which receives the regional air conditioning strategy formed in Embodiment 2, determines the ventilation facilities and ventilation adjustment parameters corresponding to the target air conditioning area, and performs independent regional air conditioning or local directional air conditioning based on whether there are complex risk ventilation conflicts. The adaptive air conditioning module includes a ventilation facility matching unit and an air conditioning control unit, and the specific execution process is as follows.

[0044] S301. Establish the control relationship between the target air conditioning area and the ventilation facilities. The ventilation facility matching unit reads the facility's location path, current opening degree, and adjustable range recorded in Example 1, associates F01 with the V02→V03 path, associates F02 with the V03→V04 path, and associates F03 with... →Associate the V05 air leakage inlet with the local exhaust branch of V06→V08, and associate F05 with the total return air capacity of the target mine area. For areas where the regional ventilation adjustment strategy can be achieved through F01 to F04, local facilities should be used first, without changing the current frequency of the main ventilation fan of F05, in order to reduce the impact on other non-target ventilation response areas.

[0045] S302. Determine the basic adjustment ratio based on the risk status. For the first gas risk area requiring enhanced ventilation, the basic emission increase ratio is recorded as follows: For the second spontaneous combustion risk area requiring restricted oxygen supply, the basic wind restriction ratio will be recorded as follows: In this embodiment, the initial adjustment amount is determined based on the degree of demand within a control range of 5% to 20%. In the formula, and All values ​​are dimensionless. This ratio is only used to generate the initial control command; actual airflow changes are further corrected based on feedback from Example 4.

[0046] S303. Determine the target opening degree of the regulating window or damper. Record the current opening degree of the facility as... The minimum and maximum opening sizes are denoted as follows: and When the facility is used to enhance exhaust ventilation along the target path, the target opening degree... for: When the facility is used to restrict the oxygen supply airflow into the second spontaneous combustion risk zone, the target opening degree is... for: Where α0 is the current opening degree of the ventilation system, α min α is the minimum allowable opening degree for ventilation facilities. max The maximum allowable opening degree of the ventilation system. To increase the target opening degree of ventilation control, To limit the airflow and adjust the target opening degree, all the above opening degrees are expressed as %; This represents the percentage change in opening calculated based on the basic adjustment ratio. For non-conflicting global ventilation adjustments where the main ventilation fan must participate, the current operating frequency is recorded as... The target frequency is denoted as Then it can be generated according to the approximate proportion of the first round: Where f0 is the current operating frequency of the main ventilation fan, f* is the target operating frequency of the main ventilation fan, and f max The maximum permissible operating frequency of the main ventilation fan; all three are in Hz. max The parameters are obtained based on the rated parameters of the main ventilator and the allowable operating range set by the mine ventilation control system. The main ventilator parameters are only activated when the target airflow change cannot be achieved in a localized area. In this embodiment, the conflict scenario F05 is not adjusted.

[0047] S304. Perform independent zone ventilation adjustment under non-ventilation conflict conditions. When only V02 meets the gas risk conditions and there is no spontaneous combustion oxygen supply restriction conflict, the system only adjusts F01, which is directly connected to V02, to increase the effective exhaust capacity of V02→V03, while maintaining the current state of F03, F04, and F05; when only V07 meets the spontaneous combustion risk conditions, the system only reduces the opening of F03 to reduce the risk. →V05 air leakage and the wind pressure driving force between V05 and V07, while maintaining the current state of the main return air path facilities from V02 to V04. This satisfies the requirement of "only adjusting ventilation facilities that have a direct ventilation connection with the corresponding risk area".

[0048] S305. Select the first target ventilation facility under the complex risk ventilation conflict state. For the first gas risk area V02, F01 is located between V02 and the return air side and does not belong to the V07 air intake path, so F01 is selected as the first target ventilation facility corresponding to V02. For the third complex risk area V06, the system does not use the V06→V07→V08 path passing through V07, but selects the V06→V08 local exhaust branch, and selects F04 as the first target ventilation facility corresponding to V06. According to the calculation results of Example 2, the gas ventilation demand level DG,02 of V02 is 0.35, and the gas ventilation demand level DG,06 of V06 is 0.20, so the initial basic emission increase ratios are 8.5% and 7.0%, respectively. The current opening degree of F01 is 58%, and the target opening degree is 66.5%; the current opening degree of F04 is 28%, and the target opening degree is 35%.

[0049] S306. Select the second target ventilation facility and limit common air leakage. The main new oxygen supply source for the third composite risk area V06 and the second spontaneous combustion risk areas V07 and V08 is → V05 air leakage inlet. F03 is located on this common air leakage path, so F03 is selected as the second target ventilation facility. The spontaneous combustion risk status of V07 is used as the main basis for controlling this inlet. The spontaneous combustion air adjustment demand level of V07 DS,07=0.50, resulting in a basic air restriction ratio of 10.0%. The current opening of F03 is 35%, and the initial target opening is 25%. This action does not increase the oxygen supply airflow of V07 and V08, and at the same time, it coordinates with F04 to change the gas discharge direction of the third composite risk area V06 from "V06→V07→V08" to "V06→V08".

[0050] S307. Establish a local airflow distribution state and send control commands. The airflow control unit combines the target opening of F01 (66.5%), F04 (35%), and F03 (25%) into a single round of control commands and sets the control sequence: first, reduce F03 to limit new air leakage on the intake side of the goaf; then, gradually increase F04 to form bypass exhaust from V06 to V08; finally, increase F01 to ensure that the airflow from V02 and V08 after entering the upper corner is smoothly discharged to V03. The opening change of each facility is divided into two execution phases, with the change in each phase not exceeding 60% of the target change in this round. A sampling period is reserved between the two phases to confirm that the airflow direction has not reversed. When the airflow direction after the corresponding connection path adjustment is consistent with the directional ventilation connection direction recorded in Example 1, and the positive and negative signs of the upstream and downstream air pressure difference of the connection path have not reversed, it is determined that the airflow direction has not reversed. F02 and F05 remain in their current state.

[0051] The corresponding facilities and the results of the first round of control in each area are shown in Table 3.

[0052] Table 3. Sample Table of Regional Air Conditioning Facility Matching and First-Round Control As shown in Table 3, this round of control did not increase the frequency of the main ventilation fan (F05) nor simultaneously increase airflow in all ventilation response areas. For V02, F01 was used to enhance its exhaust capacity to the return air side; for V06, F04 was used to direct the exhaust air direction towards V08; and F03 was used to reduce new air leakage on the intake side of the goaf. No airflow enhancement facilities were installed for V07, ensuring from the control structure that "enhanced gas exhaust" and "limited spontaneous combustion oxygen supply" acted on different local paths. After the control was completed, Example 4 performed feedback detection using the same monitoring and risk calculation methods as Example 2.

[0053] Example 4 This embodiment corresponds to a feedback correction module, which is used to reacquire the air volume, air pressure, gas concentration, carbon monoxide concentration, oxygen concentration, and temperature of the target air-adjustment area and adjacent ventilation response areas after the regional air-adjustment strategy is executed in Embodiment 3. It then re-determines the gas risk status and spontaneous combustion risk status, and maintains or adjusts the target air-adjustment area, air-adjustment direction, and facility control parameters based on the changes. The feedback correction module includes an air-adjustment result detection unit and an air-adjustment strategy adjustment unit, and the specific execution process is as follows.

[0054] S401, Feedback detection cycle after ventilation adjustment. After F01, F03, and F04 reach the initial target opening, the ventilation adjustment result detection unit continuously monitors for 20 minutes with a sampling cycle of 1 minute. Air volume and air pressure use the same monitoring sections as in Example 1; gas concentration, gas growth rate, and duration are calculated using the same methods as in Example 2 (S201 to S203); spontaneous combustion risk status is calculated using the same CO, oxygen, and temperature rise parameters as in Example 2 (S204 to S205). This ensures direct comparability of risk status before and after ventilation adjustment.

[0055] S402. Calculate the reduction ratio of gas risk status and the change ratio of spontaneous combustion risk status. Record the gas risk status before ventilation adjustment as... The gas risk status recalculated after ventilation adjustment is recorded as follows: The risk of spontaneous combustion before and after air adjustment is recorded as follows: and The proportion of gas risk level reduction for: Change in spontaneous combustion risk status (percentage) for: In the formula, To prevent positive numbers with a denominator of zero, this embodiment uses 0.001. When When the gas risk level decreases; when This indicates that the risk of spontaneous combustion has not increased.

[0056] S403. Determine whether to maintain the current strategy based on the results of the first round of retesting. When the gas risk status of the first gas risk area decreases and the spontaneous combustion risk status of the second spontaneous combustion risk area does not increase, maintain the current target air adjustment area and air adjustment direction; for the third composite risk area, check its gas risk status and spontaneous combustion risk status simultaneously. When either risk no longer meets the corresponding judgment condition, remove the third composite risk area marker and redetermine the subsequent air adjustment method according to the remaining risk type; when the gas risk status of the original first gas risk area does not decrease, reselect the target air adjustment area from the connection relationship between that area and the return air side; when the spontaneous combustion risk status of any second spontaneous combustion risk area increases, proceed to S404 to correct the adjustment range and re-check the spatial position relationship of the three types of risk areas.

[0057] The representative retest results after the first round of control are shown in Table 4.

[0058] Table 4 Sample Risk Feedback Table After the First Round of Airflow Adjustment Table 4 shows that the gas risk status of V02 and V06 has decreased significantly, indicating that F01 and F04 have achieved effective ventilation. The spontaneous combustion risk status of V05 and V08 has decreased, but the spontaneous combustion risk status of V07 has increased from 1.500 to 1.575. Although V07 did not experience gas risk, its spontaneous combustion risk increased, indicating that the first round of local ventilation still had a detectable wind pressure impact on the deep areas. Therefore, the system did not directly continue to increase the opening of F04, but instead entered the ventilation amplitude correction stage.

[0059] S404. Reduce the adjustment range related to the air intake passage of the second spontaneous combustion risk zone. The previous round of facility increments that caused the increased spontaneous combustion risk are denoted as... The corrected retention coefficient is denoted as This embodiment determines the percentage based on the increase in spontaneous combustion risk: For each secondary spontaneous combustion risk area affected by the same target ventilation facility adjustment, compare the proportion of change in spontaneous combustion risk status δS,i, and record the largest positive value as δS; when all δS,i are not greater than 0, δS = 0. δS is used to characterize the maximum increase in risk caused by this round of ventilation adjustment to the relevant secondary spontaneous combustion risk area.

[0060] Corrected ventilation system adjustment increment for: in, For the previous round of ventilation facility adjustments that caused the increased risk status of the second spontaneous combustion risk area, for dampers or regulating windows, and The units are all percentage points of opening; γ is the adjustment increment retention coefficient, which is a dimensionless quantity.

[0061] For V07, ,get The system first reduces the 7 percentage point increase in F04 relative to the initial 28% opening to 6.65 percentage points, adjusting F04 from 35% to 34.65%. Simultaneously, since the oxygen supply path to V07 still passes through F03, the opening of F03 is further reduced by 2 percentage points from 25% to 23%, prioritizing reducing air leakage into V05. F01 remains at 66.5% because it is located in the V02 to V03 return air path and does not belong to the V07 intake air path.

[0062] S405. When the gas risk status has not decreased, the target ventilation adjustment area is redefined. If V06 occurs in a subsequent detection cycle, the air volume of the deep path passing through V07 is not increased, but the connection status of V06 to V08, V08 to V02, and V02 to V03 is rechecked. If the detected air volume of the corresponding local branch after the opening of F04 is increased is not higher than the air volume before adjustment, it is determined that the air volume of the local branch has not increased with the change of opening. V08 and V02 are added to the target ventilation adjustment area at the same time, and the control parameters of F04 and F01 are recalculated without increasing the opening of F03. If the difference between the current opening and the maximum allowable opening of the regulating facility corresponding to the path from V02 to V03 does not exceed 5% of the allowable opening range of the facility, it is determined that the path is close to the allowable upper limit of the facility, and control information that requires on-site verification of the status of local ventilation facilities is generated. Local ventilation adjustment is not directly replaced by increasing the total air volume of F05.

[0063] S406. Redetermine the three risk zones and ventilation direction. After correction by S404, the system continues to acquire V01 to V08 status data according to a 20-minute detection cycle. If the gas risk and spontaneous combustion risk of the third composite risk zone V06 both decrease, and the spontaneous combustion risk of V07 decreases simultaneously, then maintain the target area and direction of "F03 wind restriction + F04 shallow bypass exhaust + F01 return air enhancement"; if the risk of V07 still increases, then further reduce the F04 increment and shrink the target ventilation area to the inlets of V02, V03, and V05 to avoid further affecting the deep connection section from V06 to V07.

[0064] S407. Generate the second round of feedback results and feed the parameters back to the adaptive airflow adjustment module. In this embodiment, after adjusting F04 to 34.65%, F03 to 23%, and maintaining F01 at 66.5%, continue monitoring for 20 minutes. The second round of feedback results are shown in Table 5.

[0065] Table 5: Corrected Second Round Feedback Sample Table As shown in Table 5, after the second round of correction, V02 no longer meets the criteria for the first gas risk zone, and the gas risk and spontaneous combustion risk of V06 have both decreased below the corresponding criteria. Therefore, the third composite risk zone is lifted. V08 no longer meets the criteria for the second spontaneous combustion risk zone, and the spontaneous combustion risk of V07 has decreased from 1.575 in the first round of feedback to 1.410. This indicates that after limiting air leakage on the intake side of the goaf and appropriately reducing the increment of F04, the upward trend of deep spontaneous combustion risk has been corrected. Since V07 still meets the criteria for the second spontaneous combustion risk zone, the system maintains the F03 air-limiting direction but does not continue to increase the exhaust regulation of F01 and F04, thereby avoiding the need to increase the oxygen supply to the deep goaf again due to continuous air increase after the gas has been controlled.

[0066] S408. Write the feedback correction results. The feedback correction module will record the redefined first gas risk area, second spontaneous combustion risk area, third composite risk area, target air adjustment area, air adjustment direction, control parameters F01 to F05, changes in air volume and air pressure before and after air adjustment, and δ for each round. G,i δ S,i The recalculated results are written into the current composite risk management record, and the adjusted target air adjustment area, air adjustment direction, and facility parameters are fed back to the adaptive air adjustment module as the initial control values ​​for the next detection cycle.

[0067] Based on embodiments one through four, this invention first divides the target area into ventilation response areas such as the working face, upper corner, return air, goaf intake side, goaf interior, and goaf return air side according to the mine spatial structure and actual airflow connection relationship. Then, it determines the first gas risk area based on gas concentration, growth rate, and duration; the second spontaneous combustion risk area is determined based on CO concentration, CO growth, oxygen status, and temperature rise; and the ventilation response area that simultaneously possesses two types of risks and whose ventilation adjustment needs act on a common path in opposite directions is further determined as the third composite risk area. When the third composite risk area is formed, overall ventilation is not increased; instead, a local exhaust path that does not increase oxygen supply to the second spontaneous combustion risk area is selected, and common leakage paths are restricted. After ventilation adjustment, the three types of risk areas are re-determined using the same indicators, and the target area and ventilation adjustment direction are corrected, thereby forming a closed-loop implementation process corresponding to claims 1 to 10.

[0068] It should be noted that the 0.80% methane determination value, 24 ppm carbon monoxide determination value, various growth rate determination values, and the first-round adjustment ratios of 5% to 20% in this embodiment are only used to illustrate the calculation and control process. In actual applications, calibration can be performed based on the historical normal operating data of the target mine, the benchmark ventilation status of different coal mining stages, the results of coal seam spontaneous combustion tendency tests, and the approved mine safety control parameters. However, the definitions of each parameter, the spatial positioning method of risk areas, the ventilation conflict judgment logic, and the feedback correction relationship remain unchanged.

[0069] It should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not to limit the present invention. Those skilled in the art can make equivalent substitutions for the number of areas, the type of monitoring equipment, the form of ventilation facilities and the range of control parameters without departing from the technical concept of the present invention, and all such substitutions should fall within the protection scope of the present invention.

Claims

1. A gas and spontaneous combustion combined risk management system based on adaptive ventilation status control, characterized in that, include: The ventilation status acquisition module is used to acquire spatial structure information, ventilation facility information, ventilation status data, gas monitoring data and spontaneous combustion monitoring data of the target mine area. Based on the spatial structure information and ventilation facility information, the target mine area is divided into multiple ventilation response zones, and ventilation connection relationships between each ventilation response zone are established. The composite risk analysis module is used to determine the first gas risk area based on the gas monitoring data of each ventilation response area, and the second spontaneous combustion risk area based on the spontaneous combustion monitoring data of each ventilation response area. When the same ventilation response area is simultaneously determined as the first gas risk area and the second spontaneous combustion risk area, and the corresponding gas ventilation adjustment demand and spontaneous combustion ventilation adjustment demand act on the same ventilation path and have opposite ventilation adjustment directions, the ventilation response area is determined as the third composite risk area. The module determines the gas ventilation adjustment demand based on the gas exhaust demand corresponding to the first gas risk area, the spontaneous combustion ventilation adjustment demand based on the oxygen supply restriction demand corresponding to the second spontaneous combustion risk area, and determines the composite risk ventilation conflict state based on the ventilation adjustment directions of the gas ventilation adjustment demand and the spontaneous combustion ventilation adjustment demand. Based on the first gas risk area, the second spontaneous combustion risk area, the third composite risk area, and the corresponding ventilation connection relationship, the module determines the target ventilation adjustment area and the corresponding ventilation adjustment direction, forming a regional ventilation adjustment strategy. The adaptive air conditioning module is used to determine the ventilation facilities and ventilation adjustment parameters corresponding to the target air conditioning area according to the regional air conditioning strategy, and to adjust the corresponding ventilation facilities to change the air volume, air pressure or airflow distribution state of the target air conditioning area. The feedback correction module is used to reacquire ventilation status data, gas monitoring data, and spontaneous combustion monitoring data of each ventilation response area after the regional ventilation adjustment strategy is implemented, redetermine the first gas risk area and the second spontaneous combustion risk area, and redetermine or cancel the third composite risk area according to the overlap of the two types of risk areas and the ventilation adjustment needs; and adjust the target ventilation adjustment area or the corresponding ventilation adjustment direction according to the redetermined first gas risk area, second spontaneous combustion risk area, third composite risk area and corresponding ventilation connection relationship.

2. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 1, characterized in that, The ventilation status acquisition module includes a zone division unit and a status acquisition unit; The area division unit is used to divide the target mine area into working face ventilation response area, upper corner ventilation response area, return air roadway, goaf boundary and ventilation facility location according to the location of the intake air roadway, coal mining face, upper corner, return air roadway, goaf intake side response area, goaf interior response area and goaf return air side response area. Establish ventilation connection relationships between upstream, downstream, and adjacent areas of each ventilation response area based on the actual airflow direction between each ventilation response area; The status acquisition unit is used to acquire the wind speed, air volume and wind pressure of each ventilation response area, and to acquire the gas concentration, carbon monoxide concentration, oxygen concentration and temperature of each ventilation response area.

3. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 2, characterized in that, The composite risk analysis module includes a first gas risk area determination unit; The first gas risk area determination unit is used to obtain the gas concentration of each ventilation response area according to a preset sampling period, obtain the gas concentration growth rate based on the gas concentration change within the continuous sampling period, and record the duration after the gas concentration reaches the corresponding gas judgment value. The gas risk status of each ventilation response zone is determined based on the gas concentration, the gas concentration growth rate, and the duration after reaching the corresponding gas threshold. The ventilation response area that meets the gas risk assessment criteria is identified as the first gas risk area, and the spatial position of the first gas risk area in the ventilation connection relationship is recorded.

4. The gas and spontaneous combustion combined risk management system based on adaptive ventilation status control according to claim 3, characterized in that, The composite risk analysis module also includes a second spontaneous combustion risk area determination unit; The second spontaneous combustion risk area determination unit is used to obtain the carbon monoxide concentration, oxygen concentration and temperature of each ventilation response area according to a preset sampling period, and to obtain the carbon monoxide concentration growth state and temperature rise state according to the carbon monoxide concentration change and temperature change within the continuous sampling period. The spontaneous combustion risk status of each ventilation response zone is determined based on carbon monoxide concentration, carbon monoxide concentration growth status, oxygen concentration, and temperature rise status. The ventilation response area that meets the spontaneous combustion risk assessment criteria is designated as the second spontaneous combustion risk area, and the spatial location of the second spontaneous combustion risk area relative to the air intake side, the air return side, and the goaf is recorded.

5. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 4, characterized in that, The composite risk analysis module also includes a ventilation demand determination unit and a ventilation conflict judgment unit; The ventilation demand determination unit is used to determine the gas ventilation demand with the goal of enhancing gas discharge based on the gas risk status of the first gas risk area and its ventilation connection relationship to the return air side. Based on the spontaneous combustion risk status of the second spontaneous combustion risk area and its ventilation connection with the air intake side, the spontaneous combustion air adjustment demand is determined with the goal of restricting the oxygen supply airflow into the second spontaneous combustion risk area. The ventilation conflict judgment unit is used to compare gas ventilation adjustment demand and spontaneous combustion ventilation adjustment demand. When the gas ventilation adjustment demand and the spontaneous combustion ventilation adjustment demand act on the same ventilation path and the corresponding air volume adjustment directions are opposite, it is determined to be a composite risk ventilation conflict state. Among them, when the same ventilation response area belongs to the first gas risk area and the second spontaneous combustion risk area, and the gas ventilation adjustment demand and the spontaneous combustion ventilation adjustment demand corresponding to the ventilation response area have the composite risk ventilation conflict, the ventilation response area is determined to be the third composite risk area. When the two act on different ventilation paths or the corresponding air volume adjustment directions are not opposite, it is determined to be a non-ventilation conflict state.

6. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 5, characterized in that, The composite risk analysis module also includes a wind regulation area determination unit; The ventilation adjustment area determination unit is used to determine the first gas risk area or the second spontaneous combustion risk area and the ventilation path directly connected to the corresponding risk area as the target ventilation adjustment area in the absence of ventilation conflict, and to determine the ventilation adjustment direction according to the corresponding gas ventilation adjustment demand or spontaneous combustion ventilation adjustment demand. Under the condition of complex risk ventilation conflict, based on the ventilation connection relationship between the first gas risk area and the second spontaneous combustion risk area to the air intake side and the air return side respectively, determine the local ventilation path that can change the airflow state of the first gas risk area without increasing the oxygen supply airflow of the second spontaneous combustion risk area; when there is a third complex risk area, prioritize finding the local ventilation path that can enhance the exhaust airflow of the third complex risk area to the air return side without increasing the oxygen supply airflow of the second spontaneous combustion risk area connected to it; The local ventilation path and the first gas risk area connected to it are identified as the target air adjustment area; when a third composite risk area exists, the third composite risk area and the local ventilation path connected to it are jointly identified as the target air adjustment area, and the direction of air adjustment is determined by enhancing the exhaust of the third composite risk area to the return air side and restricting the new airflow from entering the second spontaneous combustion risk area.

7. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 6, characterized in that, The adaptive air conditioning module includes a ventilation facility matching unit and an air conditioning control unit; The ventilation facility matching unit is used to determine the main ventilation fan, local ventilation fan, damper or regulating window set in the upstream, downstream or corresponding local ventilation path of the target air conditioning area according to the target air conditioning area and its corresponding ventilation connection relationship, and to establish the control relationship between the target air conditioning area and the corresponding ventilation facility. The air conditioning control unit is used to determine the fan operating parameters, damper opening, or adjustable window opening of the corresponding ventilation facility according to the air conditioning direction, and to send air conditioning control commands to the corresponding ventilation facility.

8. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 7, characterized in that, The adaptive ventilation module is used to perform independent zone ventilation when there is no compound risk ventilation conflict between the first gas risk zone and the second spontaneous combustion risk zone and no third compound risk zone is formed. When the target air adjustment area corresponds to the first gas risk area, improve the effective exhaust capacity of the ventilation path from the first gas risk area to the return air side. When the target air conditioning area corresponds to the second spontaneous combustion risk area, reduce the air leakage from the air intake side to the second spontaneous combustion risk area or reduce the air pressure difference between the air intake side and the return air side of the second spontaneous combustion risk area. The adaptive ventilation module only adjusts ventilation facilities that have a direct ventilation connection with the corresponding risk area, while maintaining the current control status of ventilation facilities in other ventilation response areas.

9. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 8, characterized in that, When a complex risk ventilation conflict is identified and a third complex risk zone is formed, the adaptive air adjustment module performs local directional air adjustment; To ensure that the oxygen supply airflow in the air intake passage corresponding to the second spontaneous combustion risk area does not increase, and to select the ventilation facility located between the third composite risk area and the return air side, which is not part of the air intake passage of the second spontaneous combustion risk area, as the first target ventilation facility. Adjust the ventilation facilities of the first target to increase the effective exhaust volume of the third composite risk area to the return air side; When there is a common air leakage path between the third composite risk area and the second spontaneous combustion risk area, the ventilation facility located on the common air leakage path is selected as the second target ventilation facility, and the second target ventilation facility is adjusted to reduce the amount of air leakage entering the second spontaneous combustion risk area. The local airflow distribution state is formed based on the adjustment results of the first and second target ventilation facilities.

10. The gas and spontaneous combustion combined risk management system based on adaptive ventilation state control according to claim 9, characterized in that, The feedback correction module includes an air adjustment result detection unit and an air adjustment strategy adjustment unit; The air adjustment result detection unit is used to reacquire the air volume, air pressure, gas concentration, carbon monoxide concentration, oxygen concentration and temperature of the target air adjustment area and its adjacent ventilation response area within a preset detection period after the implementation of the regional air adjustment strategy, and to re-determine the gas risk status and spontaneous combustion risk status, and to judge the maintenance, transformation or elimination status of the first gas risk area, the second spontaneous combustion risk area and the third composite risk area. When the gas risk status of the first gas risk zone decreases and the spontaneous combustion risk status of the second spontaneous combustion risk zone does not increase, maintain the current target ventilation area and ventilation direction. When the gas risk status of the first gas risk area has not been reduced, the target air adjustment area shall be re-determined based on the re-determined first gas risk area and its ventilation connection relationship to the return air side. When the spontaneous combustion risk status of the second spontaneous combustion risk zone increases, the adjustment range of the ventilation facilities corresponding to the air intake passage of the second spontaneous combustion risk zone is reduced, and the air adjustment direction is re-determined according to the spatial relationship between the first gas risk zone, the second spontaneous combustion risk zone and the third composite risk zone. The adjusted target air conditioning area, air conditioning direction, and ventilation facility control parameters are fed back to the adaptive air conditioning module.

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