Regulation Judging Research Of High And Low Concentration Gas Drainage Subsystem In Mine

Extraction system can't reasonably be regulated and controlled for lacking of accurate cognition to drainage gas concentration fluctuation rule and the bondary of high and low concentration gas can't be precisely defined in the process of extracting seam gas of using dual system for high and low concentration.lt will result in resource waste of high concentration gas and form the security hidden danger of low concentration gas transportation when the gas concentration transit from high to low or from low to high in the gas drainage system.To solve this problem,according to the mainly using methods and requirements for the concentration of the gas source at home and abroad for coal mining area gas,and application of the theory of fuzzy mathematics and interval fuzzy number,the fuzzy interval boundary model of high and low concentration gas is set up.And the statistical analysis of the drainage gas data is made the different coal mine area and different continuous interval of gas drainage.Then determine the boundary value of high and low concentration range and calculate the probability of each wave interval,and obtain the approximate membership degree and membership function of the gas value.The results showed that the main concentration fluctuations occurres in 32%-25%,and the strong fluctuation area is between 30%?27%,average time for more than 5 days.And determine the gas concentration[25%,31%]as fuzzy control interval of,the high and low concentration in gas drainage system,the median 28%as the gas regulation to high and low concentration.The results provide a theoretical basis of reasonable regulation for high and low concentration gas drainage system and it has the great significance to realize the sustainable security development strategy of "promote drainage by utilization,balance drainage and utilization"of gas resources.