CN-121993244-A - Intelligent control system and method for natural ignition of coal mine gas extraction drilling

CN121993244ACN 121993244 ACN121993244 ACN 121993244ACN-121993244-A

Abstract

The invention discloses a natural ignition intelligent prevention and control system and method for coal mine gas extraction drilling holes, which relate to the technical field of coal mine gas disaster prevention and control and coal seam spontaneous combustion prevention and control, wherein the system adopts a framework combining distributed execution and centralized control, and comprises an extraction main pipeline, a nitrogen injection main pipeline, a central control module and a plurality of independent control units, each drilling hole is provided with an independent temperature, an oxygen concentration sensor, a carbon monoxide concentration sensor, an extraction and nitrogen injection electric valve, and the extraction main pipeline is provided with a total electric valve. The invention realizes the full-flow automatic closed-loop control of the spontaneous combustion risk of gas extraction, combines the prevention and control safety and the gas extraction efficiency, adapts to the construction requirements of an intelligent mine, and has extremely high popularization value.

Inventors

TANG ZONGQING
TAO FAN
XIE XINGMAO
WANG ZHANGCHENG
LI JIARUI
LIU LI
MA MINGJIE
Xie Zhouzhou
REN LIFENG
Dai Renkun

Assignees

西安科技大学

Dates

Publication Date: 20260508
Application Date: 20260323

Claims (8)

1. The natural ignition intelligent prevention and control system for the coal mine gas extraction drilling holes is characterized by comprising a main extraction pipeline, a main nitrogen injection pipeline, a central control module and a plurality of independent control units which are arranged in one-to-one correspondence with the gas extraction drilling holes; The extraction main pipeline is used for providing a negative pressure extraction channel for the gas extraction drilling hole, and the nitrogen injection main pipeline is used for providing an inerting nitrogen injection channel for the gas extraction drilling hole; Each independent control unit comprises a pumping branch pipe, a nitrogen injection branch pipe, a temperature sensor, an oxygen concentration sensor and a carbon monoxide concentration sensor; two ends of the extraction branch pipe are respectively communicated with corresponding gas extraction drilling holes and extraction main pipelines, and extraction electric valves are connected in series on the extraction branch pipe; the temperature sensor, the oxygen concentration sensor and the carbon monoxide concentration sensor are all arranged in the corresponding gas extraction drill holes and are used for collecting temperature, oxygen concentration and carbon monoxide concentration parameters in the gas extraction drill holes in real time; The extraction main pipeline is connected with a total electric valve in series, and the extraction electric valve, the nitrogen injection electric valve, the total electric valve, the temperature sensor, the oxygen concentration sensor and the carbon monoxide concentration sensor are all in communication connection with the central control module; The central control module is used for receiving real-time parameters of each gas extraction drilling hole, completing risk judgment, outputting corresponding control instructions to each electric valve, and realizing start and stop of gas extraction and start and stop of nitrogen injection of each gas extraction drilling hole.
2. A method of operating a natural ignition intelligent prevention and control system for a coal mine gas extraction borehole according to claim 1, comprising the steps of: S1, acquiring parameters in real time, namely acquiring parameters of temperature, oxygen concentration and carbon monoxide concentration in corresponding gas extraction drilling holes in real time through temperature sensors, oxygen concentration sensors and carbon monoxide concentration sensors in each gas extraction drilling hole, and transmitting acquired data to a central control module in real time; S2, single-hole risk grading judgment and control, wherein the central control module completes risk grade judgment based on real-time parameters of single drilling and executes a corresponding grading control strategy; s3, regional risk aggregation judgment and linkage control, wherein a central control module continuously counts risk states of all gas extraction holes in a target region, completes regional risk aggregation judgment, and executes a corresponding regional linkage control strategy; And S4, automatically recovering the gas extraction operation of the corresponding gas extraction drilling holes or areas by the central control module after the risk parameters of the single gas extraction drilling holes or the target areas meet the corresponding judging conditions, completing one-time closed-loop control, and circularly executing the steps S1 to S4 to realize full-period dynamic management and control.
3. The working method according to claim 2, wherein the step S2 specifically includes: s21, primary risk judgment and control, wherein when a single gas extraction drilling parameter meets a primary risk state judgment condition, the central control module closes an extraction electric valve of the gas extraction drilling, stops negative pressure extraction, and simultaneously starts a continuous monitoring mechanism; S22, judging and controlling the secondary risk, wherein under the condition of stopping pumping, if the gas extraction drilling parameters meet the judging condition of the secondary risk state, the central control module starts a nitrogen injection electric valve of the drilling to execute single-hole independent inerting nitrogen injection, and if the gas extraction drilling parameters tend to be stable or decline, the gas extraction drilling parameters are maintained to be in a state of stopping pumping observation, and the nitrogen injection operation is not started.
4. The working method of claim 3, wherein the first-stage risk state is judged by judging whether the oxygen concentration in the gas extraction drill hole is more than or equal to 5 percent or the carbon monoxide concentration is more than or equal to 50 ℃ generated under the condition that the carbon monoxide concentration is more than or equal to 50 ℃ in a natural ignition test of a coal sample or the temperature in the gas extraction drill hole is more than or equal to 50 ℃ or if any condition is met; The judging condition of the secondary risk state is that after the gas extraction drill hole enters a primary risk state and stops extracting, the carbon monoxide concentration is increased by more than or equal to 30% compared with the initial super-limit value, or the temperature is increased by more than or equal to 30% compared with the initial super-limit value, and the secondary risk state is judged when any condition is met.
5. The working method of the nitrogen injection inerting method is characterized in that the step S3 is characterized in that the central control module counts the number proportion of abnormal gas extraction holes in the area, the risk state of adjacent holes and the overall parameter change trend of the area in real time, and when the judging condition of area risk aggregation is met, the total electric valve of the extraction main pipeline is closed, the negative pressure extraction of the area is cut off, and meanwhile the overall nitrogen injection inerting operation of the area is started.
6. The working method of claim 5, wherein the judging condition of regional risk aggregation is that the number of abnormal gas extraction holes in the region is more than or equal to 70%, or a plurality of adjacent gas extraction holes enter a secondary risk state at the same time, or the average temperature and the average carbon monoxide concentration of all gas extraction holes in the region are in continuous rising trend, and the regional risk aggregation is judged if any condition is met.
7. The working method according to claim 2, wherein in the step S4, the judging condition of the extraction recovery of the single gas extraction drill hole is that the oxygen concentration in the drill hole is less than 2%, the carbon monoxide concentration and the temperature generated under the condition of 30 ℃ in the natural ignition test of the coal sample are recovered to the reference temperature of the coal wall, the parameters are stable for 48 hours or more, and the judging condition of the extraction recovery of the region is that the parameters of all the gas extraction drill holes in the region meet the judging condition of the extraction recovery of the single drill hole, and the stability lasts for 48 hours or more.
8. The working method according to claim 2, wherein in the step S4, when a certain gas extraction borehole meets the extraction recovery determination condition, the central control module closes the nitrogen injection electric valve of the gas extraction borehole and opens the extraction electric valve of the borehole to recover the normal gas extraction of the gas extraction borehole, and when all gas extraction boreholes in the region meet the single gas extraction borehole extraction recovery determination condition, the central control module stops nitrogen injection of all gas extraction boreholes in the region and opens the total electric valve of the main extraction pipeline to recover the whole gas extraction in the region.

Description

Intelligent control system and method for natural ignition of coal mine gas extraction drilling Technical Field The invention belongs to the technical field of coal mine gas disaster prevention and control and coal seam spontaneous combustion prevention and control, and particularly relates to an intelligent natural ignition prevention and control system and method for coal mine gas extraction drilling. Background The coal mine gas extraction is a core technical means for preventing and controlling gas disasters, suppressing gas explosion accidents and guaranteeing the safe production of coal mines, and the extracted gas can be used as clean energy to realize resource utilization. The existing coal mine gas extraction generally adopts a drilling continuous negative pressure extraction process, and continuous extraction of coal seam gas is realized by constructing gas extraction drilling holes in a coal body, arranging extraction pipelines in the drilling holes and accessing a mine negative pressure extraction system. However, in the field long-term production practice, the process has obvious defects of preventing and controlling spontaneous combustion of coal beds, namely, cracks of surrounding coal bodies continuously develop and expand under the action of long-term negative pressure and are finally communicated with a roadway or an external space, external air continuously leaks into the drill holes and the surrounding coal bodies along the cracks of the coal bodies under the drive of the negative pressure, so that the oxygen concentration of the coal bodies in the drill holes and the surrounding coal bodies is greatly increased, the coal bodies have spontaneous combustion tendency, and when the conditions of combustible coal quality, sufficient oxygen and proper temperature are simultaneously provided, the coal bodies are extremely easy to be oxidized and heated, and finally spontaneous combustion accidents of the coal beds are caused. Particularly in the coal seam with high gas, rich gas content or low deterioration degree, the coal seam has poor air permeability, long extraction period, higher spontaneous combustion tendency of the coal body and more prominent safety risk. Aiming at the spontaneous combustion prevention and control of the coal seam in the gas extraction process, the prior art mostly adopts the modes of manual inspection, manual stop of extraction after single gas overrun, manual nitrogen injection inerting and the like for intervention. The method has the core defects that firstly, the method relies on manual inspection and manual judgment seriously, risk identification and response have obvious hysteresis, and for mines with large drilling quantity and wide distribution range, manual management is extremely difficult, management and control omission are extremely easy to occur, secondly, single parameter threshold value management and control are adopted, multi-parameter coupling judgment is not achieved, the risk identification accuracy is low, misjudgment and omission are easy to occur, thirdly, a hierarchical response mechanism is not established, differential management and control cannot be performed according to risk grades, the problem of excessive nitrogen injection or insufficient prevention and control is easy to occur, meanwhile, automatic recovery extraction after risk elimination cannot be achieved, gas extraction efficiency is greatly affected, fourthly, only single-hole scattered management and control can be achieved, regional risk aggregation identification and linkage prevention and control mechanism is not established, regional and spontaneous combustion risks cannot be met, and the construction requirements of intelligent mines are difficult to meet. Therefore, development of a gas extraction spontaneous combustion prevention system and a gas extraction spontaneous combustion prevention method based on multi-parameter comprehensive judgment, having hierarchical response capability and capable of realizing single Kong Jing quasi-control and regional linkage protection and full-flow automatic operation is a technical problem to be solved in the field. Disclosure of Invention Aiming at the problems in the prior art, the invention provides an intelligent control system and method for natural ignition of a coal mine gas extraction borehole, which solves the problems that in the prior art, risk identification is lagged, control precision is low, hierarchical response is impossible, automation degree is insufficient, regional risk prevention and control capability is weak, extraction efficiency and safety prevention and control cannot be considered through a technical scheme of multi-parameter coupling risk judgment, single-hole hierarchical response control and regional risk linkage control. In order to achieve the purpose, the technical scheme is that the natural ignition intelligent prevention and control system for the coal mine gas extraction drilling holes comprise