Experimental study on f-ωregulation model under abnormal methane emission
Experimental study on f-ωregulation model under abnormal methane emission
复制标题
甲烷排放异常情况下f-β调节模型实验研究
DOI：
10.1016/j.ijmst.2016.09.026
复制
发表时间：
2016
影响因子：
11.8
通讯作者：
Pei Xiaodong
中科院分区：
文献类型：
--
作者：
Wu Zhengyan;Jiang Shuguang;Wang Kai;Shao Hao;Zhou Song;He Xinjian;Han Jing;Cui Chuanbo;Pei Xiaodong
针对矿井通风系统自动调节困难、回收滞后、存在重大事故隐患等问题，以大柳塔煤矿典型单井和某工作面通风系统为例，建立了管网实验模型。采用切比雪夫插值法的最佳均匀逼近方法对风机性能曲线进行拟合，实验测定了不同频率下的风机特性，并建立了曲线的数据库。基于通风网络监测理论，设计了一套通风网络参数监测和风机运行频率自动控制的监测系统。利用甲烷绝对排放量预测支路风量需求和风机频率，建立了基于风机频率和绝对甲烷排放量的af-ω调节模型。在分析瓦斯涌出及分布特征的基础上，利用CO2对某工作面瓦斯涌出特征进行了模拟，验证了f-ω调控模型的正确性和合理性。在确定风量需求后，采用空气调节随甲烷排放量变化的方法和曲线搜索法调整风机运行频率。结果表明，分支风量严格按照f-ω调节模型变化，在风机频率调节的增风稀释中，CO2浓度被限制在设定的阈值范围内。验证了调频系统的实用性和调频方案的可行性，为煤矿通风网络自动变频控制系统的建设提供了指导。
In view of the difficulty of automatic adjustment, the recovery lag and the major accident potential of the mine ventilation system, an experimental model of the pipe net was established according to the typicalone mine and one working faceventilation system of Daliuta coal mine. Using the best uniform approximation method of Chebyshev interpolation to fit the fan performance curve, we experimentally determined fan characteristics with different frequencies and establish the data base for the curves. Based on ventilation network monitoring theory, we designed a monitoring system for ventilation network parameter monitoring and fan operating frequency automatic control. Using the absolute methane emission quantity to predict the air quantity requirement of branch and fan frequency, we established af-ωregulation model based on fan frequency and absolute methane emission quantity. After analysing methane emission and distribution characteristics, using CO2to simulate the methane emission characteristics from a working face, we verified the correctness and rationality of thef-ωregulation model. The fan operation frequency is adjusted by the method of air adjustment change with methane emission quantity and the curve searching method after determining air quantity requirements. The results show that the air quantity in a branch strictly changes according to thef-ωregulation model, in the air-increasing dilution by fan frequency regulation, the CO2concentration is limited to the set threshold value. The paper verifies the practicability of a frequency regulation system and the feasibility of the frequency adjustment scheme and provides guidance for the construction of automatic frequency conversion control system in coal mine ventilation networks.