Coal mine underground atomization flame-retardant fire preventing and extinguishing method

Abstract

The invention relates to the technical field of coal mine underground fire prevention methods, in particular to a coal mine underground atomization flame-retardant fire prevention and extinguishing method which comprises the following steps: acquiring environment monitoring data including temperature data and various gas concentration data in a coal mine underground fire prevention and extinguishing target area in real time; performing dynamic analysis on the environment monitoring data based on a weighted index method, calculating to obtain a real-time fire risk comprehensive index, and determining a fire risk grade according to the real-time fire risk comprehensive index; according to the evaluated fire risk level, an atomization operation instruction is dynamically generated and issued, and the atomization operation instruction comprises adjusting parameters of the inhibitor concentration and the spraying flow; the atomization generation device receives an atomization operation instruction, automatically adjusts operation parameters of a stopping agent supply system, and applies an atomization flame-retardant medium to a target area at the updated concentration and flow; the fire preventing and extinguishing effect of the underground coal mine can be improved.

Description

Technical Field

[0001] This invention relates to the technical field of underground coal mine fire prevention methods, and in particular to an underground coal mine atomized flame-retardant fire prevention and extinguishing method. Background Technology

[0002] Spontaneous combustion of coal is one of the most serious hazards in underground coal mines, posing a severe threat to safe production. Atomized flame-retardant fire prevention and extinguishing technology, with its advantages of wide coverage and significant cooling and flame-retardant effects, has become a commonly used method for preventing spontaneous combustion of coal.

[0003] Existing atomized fire prevention and extinguishing methods typically involve installing atomized spraying devices in potential fire-prone areas such as goafs and roadways, and periodically or continuously spraying inhibitor solutions such as calcium chloride and magnesium chloride in order to coat the coal body and isolate oxygen.

[0004] However, existing atomized fire prevention and extinguishing methods often rely on a single threshold alarm in practice, such as when the carbon monoxide concentration exceeds the limit. When the alarm is triggered, the coal spontaneous combustion process may have already entered the accelerated oxidation stage, missing the best opportunity for early intervention, resulting in insufficient fire prevention and extinguishing effects in coal mines. Summary of the Invention

[0005] The purpose of this invention is to provide a method for atomizing flame-retardant fire prevention and extinguishing in coal mines, which can improve the fire prevention and extinguishing effect in coal mines.

[0006] To achieve the above objectives, the present invention provides a method for atomizing flame-retardant fire prevention and extinguishing in underground coal mines, comprising: Real-time collection of environmental monitoring data, including temperature data and various gas concentration data, within the target area for fire prevention and extinguishing in underground coal mines; The environmental monitoring data is dynamically analyzed using the weighted index method to calculate the real-time comprehensive fire risk index, and the fire risk level is determined accordingly. Based on the assessed fire risk level, atomization operation instructions are dynamically generated and issued. The atomization operation instructions include adjustment parameters for inhibitor concentration and spray flow rate. The atomizing device receives the atomizing operation command and automatically adjusts the operating parameters of the flame retardant supply system to apply the atomized flame retardant medium to the target area with the updated concentration and flow rate.

[0007] The process, including the step of the atomizing device receiving the atomizing operation command, automatically adjusting the operating parameters of the inhibitor supply system, and applying the atomized flame retardant medium to the target area with the updated concentration and flow rate, further includes: After the atomization operation is carried out, environmental monitoring data continues to be collected to evaluate the fire extinguishing effect and serve as input for subsequent risk assessment and parameter adjustment, forming an adaptive closed-loop control.

[0008] The concentration data of the various gases include the concentrations of oxygen, carbon monoxide, and ethylene.

[0009] The specific steps for dynamically analyzing environmental monitoring data based on the weighted index method, calculating the real-time comprehensive fire risk index, and determining the fire risk level accordingly include: Standardized preprocessing of environmental monitoring data; Based on the weighted index method, the preprocessed environmental monitoring data is calculated to obtain the real-time comprehensive fire risk index. The calculated comprehensive fire risk index is compared with the preset risk level threshold to determine the current fire risk level.

[0010] The fire risk levels include three levels: normal monitoring level, early warning and intervention level, and fire alarm emergency level.

[0011] Based on the assessed fire risk level, atomization operation instructions are dynamically generated and issued. These instructions include specific steps for adjusting parameters such as inhibitor concentration and spray flow rate. A pre-defined rule base for mapping fire risk levels to atomization operation parameters; Based on the determined fire risk level, the mapping rule base is queried to obtain the corresponding target inhibitor concentration and target spray flow rate; Based on the target inhibitor concentration and target spray flow rate, an atomization operation instruction containing specific adjustment parameters is generated and sent to the atomization generator.

[0012] The specific steps involved in collecting environmental monitoring data after the atomization operation to assess the fire extinguishing effect and serve as input for subsequent risk assessment and parameter adjustment, forming an adaptive closed-loop control, include: After a preset time has elapsed during the atomization process, environmental monitoring data for the target area for fire prevention and extinguishing in the underground coal mine is collected again. Compare and analyze the environmental monitoring data after the atomization operation with the data before the operation to assess the trend changes of key indicators; Based on the assessment results, if the fire extinguishing effect does not meet expectations, the automatic optimization and adjustment of the atomization operation command parameters will be triggered, and the next control cycle will begin.

[0013] The present invention discloses a method for atomizing flame retardant fire prevention and extinguishing in coal mines. By comprehensively analyzing the rate of temperature change and the concentration and trend of various characteristic gases, including oxygen, carbon monoxide, and ethylene, it is possible to calculate a continuous risk index characterizing the incubation and development process of a fire. This enables the identification of potential self-heating hazards before the appearance of obvious open flames or alarms of excessively high concentrations, and automatically upgrades the prevention and control level and initiates proactive intervention, thereby improving the fire prevention and extinguishing effect in coal mines. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a complete flowchart of a coal mine underground atomization flame retardant and fire extinguishing method according to the present invention.

[0016] Figure 2 This is a flowchart of step S2 of a coal mine underground atomization flame retardant and fire extinguishing method according to the present invention.

[0017] Figure 3 This is a flowchart of step S3 of a coal mine underground atomization flame retardant fire prevention and extinguishing method according to the present invention.

[0018] Figure 4 This is a flowchart of step S5 of a coal mine underground atomization flame retardant and fire extinguishing method according to the present invention. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0020] Please see Figures 1-4 This invention provides a method for atomizing flame-retardant fire prevention and extinguishing in underground coal mines, comprising: S1 collects environmental monitoring data in real time within the target area for fire prevention and extinguishing in underground coal mines, including temperature data and various gas concentration data; the various gas concentration data include the concentrations of oxygen, carbon monoxide, and ethylene.

[0021] In this embodiment, firstly, a multi-source sensor network is systematically deployed in the target area requiring protection underground in the coal mine, such as the goaf, the return airway of the working face, or within the sealed wall. This network includes at least a temperature sensor array for measuring the temperature distribution of the area, multi-parameter gas sensors for detecting the concentrations of key gases (continuously monitoring the concentrations of oxygen (O2), carbon monoxide (CO), and ethylene (C2H4),) and wind speed and pressure sensors for monitoring environmental dynamic conditions. These sensors are connected via a wired industrial ring network or a wireless sensor network, continuously transmitting the collected raw environmental monitoring data to achieve all-weather perception of the status of the fire prevention and extinguishing target area.

[0022] S2 uses a weighted index method to dynamically analyze environmental monitoring data, calculates a real-time comprehensive fire risk index, and determines the fire risk level accordingly. The specific steps include: S21 standardizes and preprocesses environmental monitoring data; S22 uses a weighted index method to calculate the real-time comprehensive fire risk index from pre-processed environmental monitoring data. S23 compares the calculated comprehensive fire risk index with a preset risk level threshold to determine the current fire risk level. The fire risk level includes three levels: normal monitoring level, early warning and intervention level, and fire alarm emergency level.

[0023] In this embodiment, real-time environmental monitoring data undergoes data preprocessing, including time alignment, filtering and denoising, and normalization. Subsequently, a pre-set dynamic fire risk assessment model based on the weighted index method is invoked, and the processed data are substituted into the calculation. This model uses the formula: A quantitative fire risk comprehensive index R is calculated, where a, b, c, and d are the weighting coefficients of the four parameters corresponding to the temperature change rate, carbon monoxide concentration, oxygen concentration, and ethylene concentration, respectively, and their sum is 1; F, G, H, and I are the indexation transformation functions of each parameter. These are four independent functions used to normalize and transform the raw monitoring data of different dimensions and numerical ranges into a standardized index that contributes to the fire risk. The rate of temperature change represents the amount of temperature change per unit time. The calculated index R is compared with multiple preset threshold intervals to dynamically determine the fire risk level of the current target area, classifying it into normal monitoring level, early warning intervention level, and fire emergency level.

[0024] Based on the assessed fire risk level, S3 dynamically generates and issues atomization operation instructions, which include adjustment parameters for inhibitor concentration and spray flow rate. The specific steps include: S31 Preset fire risk level and atomization operation parameter mapping rule library; Based on the determined fire risk level, S32 queries the mapping rule base and matches the corresponding target inhibitor concentration and target spray flow rate. S33 generates an atomization operation command containing specific adjustment parameters based on the target inhibitor concentration and the target spray flow rate, and sends it to the atomization generator.

[0025] In this embodiment, based on the fire risk level determined in real time in step S2, a preset risk-parameter mapping rule base is queried. This rule base defines optimized atomization operation strategies to be adopted under different risk levels. For example, under the "normal monitoring level," low concentration and basic flow rate maintenance spraying parameters are used; under the "early warning intervention level," the inhibitor concentration and total spray flow rate are increased, and the flow rate is guided towards the identified high-temperature points; under the "fire alarm emergency level," the highest concentration and maximum flow rate are used, and resources are concentrated for targeted spraying of the core high-temperature area. Based on the matched strategy, atomization operation instructions are dynamically generated, including specific parameters such as the target inhibitor concentration, target total flow rate, and even the flow distribution ratio of each branch, and these instructions are sent to the atomization generator at the execution layer.

[0026] The S4 atomizing device receives the atomizing operation command and automatically adjusts the operating parameters of the inhibitor supply system to apply the atomized flame retardant medium to the target area with the updated concentration and flow rate. In this embodiment, after receiving the atomization operation command, the atomizing device coordinates its various units to execute it precisely. Specifically, the high-precision metering pump in the mixing unit automatically adjusts the intake ratio of the inhibitor stock solution and water according to the target concentration parameter in the command, completing the precise preparation of the solution. At the same time, the variable frequency pump in the delivery unit adjusts its speed according to the target total flow parameter in the command, and the electric regulating valves on each branch of the pipeline adjust their opening degree according to the flow distribution command, thereby achieving precise control of the total flow and the zoned flow. Finally, the inhibitor solution prepared according to the set concentration ratio is delivered to the atomizing nozzle array arranged in the target area under the set pressure, and sprayed out with the designed atomized particle size to achieve precise coverage of the fire source or potential hazard area.

[0027] After the atomization operation is completed, S5 continues to collect environmental monitoring data to evaluate the fire extinguishing effect and as input for subsequent risk assessment and parameter adjustment, forming an adaptive closed-loop control.

[0028] The specific steps include: After a preset time has elapsed during the atomization process, S51 will collect environmental monitoring data of the target area for fire prevention and extinguishing in the underground coal mine again. S52 compares and analyzes environmental monitoring data after atomization operations with data before operations to assess the trend changes of key indicators; If the fire extinguishing effect does not meet expectations based on the evaluation results, S53 will trigger automatic optimization and adjustment of the atomization operation command parameters and enter the next control cycle.

[0029] In this embodiment, after a fogging operation command is executed and continues for a period of time, an effect evaluation cycle is performed. During this cycle, the sensor network collects environmental monitoring data of the target area again. Then, the key indicators after the operation (such as the rate of temperature decrease and the rate of increase in CO concentration) are compared and analyzed with the data before the operation and the expected effect model. If the analysis results show that the fire extinguishing or suppression effect has not reached the preset target, optimization is automatically triggered, the weight coefficients in the risk assessment model or the strategies in the parameter mapping rule base are fine-tuned, and a new optimized fogging operation command is generated and issued in the next control cycle. This forms an adaptive closed-loop control process of monitoring, evaluation, regulation, execution, and re-monitoring until the fire risk is effectively eliminated or controlled within a safe range.

[0030] The present invention discloses a method for atomizing flame retardant fire prevention and extinguishing in coal mines. By comprehensively analyzing the rate of temperature change and the concentration and trend of various characteristic gases, including oxygen, carbon monoxide, and ethylene, it is possible to calculate a continuous risk index characterizing the incubation and development process of a fire. This enables the identification of potential self-heating hazards before the appearance of obvious open flames or alarms of excessively high concentrations, and automatically upgrades the prevention and control level and initiates proactive intervention, thereby improving the fire prevention and extinguishing effect in coal mines.

[0031] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A method for atomizing flame-retardant fire prevention and extinguishing in underground coal mines, characterized in that, include: Real-time collection of environmental monitoring data, including temperature data and various gas concentration data, within the target area for fire prevention and extinguishing in underground coal mines; The environmental monitoring data is dynamically analyzed using the weighted index method to calculate the real-time comprehensive fire risk index, and the fire risk level is determined accordingly. Based on the assessed fire risk level, atomization operation instructions are dynamically generated and issued. The atomization operation instructions include adjustment parameters for inhibitor concentration and spray flow rate. The atomizing device receives the atomizing operation command and automatically adjusts the operating parameters of the flame retardant supply system to apply the atomized flame retardant medium to the target area with the updated concentration and flow rate.

2. The coal mine underground atomized flame-retardant fire prevention and extinguishing method as described in claim 1, characterized in that, After the atomizing device receives the atomization operation command and automatically adjusts the operating parameters of the inhibitor supply system to apply the atomized flame retardant medium to the target area with the updated concentration and flow rate, the process further includes: After the atomization operation is carried out, environmental monitoring data continues to be collected to evaluate the fire extinguishing effect and serve as input for subsequent risk assessment and parameter adjustment, forming an adaptive closed-loop control.

3. The coal mine underground atomized flame-retardant fire prevention and extinguishing method as described in claim 1, characterized in that, The concentration data for the various gases include the concentrations of oxygen, carbon monoxide, and ethylene.

4. The coal mine underground atomized flame-retardant fire prevention and extinguishing method as described in claim 1, characterized in that, The specific steps for dynamically analyzing environmental monitoring data using the weighted index method to calculate a real-time comprehensive fire risk index and determine the fire risk level based on this index include: Standardized preprocessing of environmental monitoring data; Based on the weighted index method, the preprocessed environmental monitoring data is calculated to obtain the real-time comprehensive fire risk index. The calculated comprehensive fire risk index is compared with the preset risk level threshold to determine the current fire risk level.

5. The coal mine underground atomized flame-retardant fire prevention and extinguishing method as described in claim 4, characterized in that, The fire risk levels are divided into three levels: normal monitoring level, early warning and intervention level, and fire alarm emergency level.

6. The coal mine underground atomized flame-retardant fire prevention and extinguishing method as described in claim 1, characterized in that, Based on the assessed fire risk level, atomization operation instructions are dynamically generated and issued. These instructions include specific steps for adjusting parameters such as inhibitor concentration and spray flow rate: A pre-defined rule base for mapping fire risk levels to atomization operation parameters; Based on the determined fire risk level, the mapping rule base is queried to obtain the corresponding target inhibitor concentration and target spray flow rate; Based on the target inhibitor concentration and target spray flow rate, an atomization operation instruction containing specific adjustment parameters is generated and sent to the atomization generator.

7. The coal mine underground atomized flame-retardant fire prevention and extinguishing method as described in claim 2, characterized in that, After the atomization operation is performed, environmental monitoring data continues to be collected to evaluate the fire extinguishing effect and serve as input for subsequent risk assessment and parameter adjustment. The specific steps to form an adaptive closed-loop control include: After a preset time has elapsed during the atomization process, environmental monitoring data for the target area for fire prevention and extinguishing in the underground coal mine is collected again. Compare and analyze the environmental monitoring data after the atomization operation with the data before the operation to assess the trend changes of key indicators; Based on the assessment results, if the fire extinguishing effect does not meet expectations, the automatic optimization and adjustment of the atomization operation command parameters will be triggered, and the next control cycle will begin.

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