Theory And Its Application On Process Control Of Coal Mine Gas Control

At present, theory of coal mine gas control technology and the research of practical application has obtained fast development, but great gas accidents still happen frequently, with high casualties, and there are closely relationships between process control of coal mine gas control and management deficiencies. To solve this problem, the gas treatment process control theory is put forward and in-depth researched. The research results of the process has the vital significance, for it should make gas control process standardized and programmed, also the security of coal and gas outburst coal mine in production and the sustainable development are ensured. The main conclusions are presented as following five aspects:1) Concept of coal gas control process and its control is proposed in this paper and their characteristics and connotation are analyzed, according to which the system structure of gas treatment process control theory is established and the research direction of gas treatment process control is maked clear. The theory of system structure includes four parts, model research on gas control process, research on process characteristic parameters, methods research on the process control, research on its support system. They are hierarchical structure similar to pyramid with bottom up gradually and comprehensiveness.2) Based on the analysis of common gas control technology and engineering applications, incorprating with the provisions of relevant standard, the model of gas control process is constructed by using the form of flowcharts. During the engineering application, diffrent circumstances of geologic structures, distribution of coal and methane can result in different instances of gas control process system. To satisfy the requitment of instance diversity, the process model have two parts: total process model and subprocess models, in which the total process modle is a frame, and one sub process model corresponds to one gas treatment technology, thus their combination constitute the instance of process system.3) On the basis of site investigation on the engeering practice, the characteristic parameters of the gas control process are obtained. By analysing the meaning, origin and occurrence frequency of the parameters, which are classified as initial parameters, dynamic parameters and node parameters. Because of the diversity and interrelation of the parameters, this paper adopt the method of mapping analsing to determine the principal conponent parameters. Because the parameters of the gas extraction and emission process is autocorrelated due to the time and space continuity of the gas conrol, the paper adopt analysis methods of temporal series to fit the autocorrelation regression model and studied the method of using residual error to elimate the autocorrelation.4) In the studying on the control methods of gas control process, the collection plan of the process parameters is designed, the tracking control methods of the construction parameters and gas extraction and emission parameters are studied. The former one is realized by the combination of single value control charts and moving range value control charts. And the last one is realized by the combination of the single value control charts, single value control charts and moving range value charts of the residual. Additionaly, this paper also proposed node control principle, which based on the combination of action set, target set, conclusion set and compare-judgment function, analyzed and designed five node control methods including regional outburst prediction node, acceptance of gas control design plan, acceptance of construction quality, acceptance of regional gas control effect and acceptance of coal mining conditions.5) According to theoretical research on gas control process and control methods,developed its support software system,designed and implemented solutions of key problems in the support system. The support software system is applied in 713 working face of Qinan coal mine in Huaibei Mining Group,by which the process system instance of experimental area is established,that is"regional outburst prediction→five gas control design plan→acceptance of gas control design plan→crossing coal seam borehole construction in 713 rock roadway→construction quality acceptance→pre-pumping gas in coal roadway strip by crossing seam boreholes→regional gas control effect test(gas extraction by crossing coal seam borehole)→roadway cutting through coal seam→excavation roadway conditions acceptance→713 coal roadway excavation→along coal seam borehole construction→construction quality acceptance→pre-pumping gas in mining region by along seam boreholes→mining conditions acceptance→working face mining". The results show that the support system makes the gas control process system, characteristic parameters , process tracking control and node control methods information management and operation as possible,initial implemented the standardized and programmed gas control process.