公式:QH=1/(9.81)½Kb(⊿H)½бTбP式中:QH-抽放的混合瓦斯量,m3/minK-孔板系数,取实际校正值b-瓦斯浓度校正系数b=(1/(1-0.00446X))½X-混合瓦斯的浓度,%⊿H-孔板前后端压差,PaбT-温度校正系数бT=(293/(273+t))½t-管道内的气体温度,℃бP-压力校正系数бP=(PT/101.325)½PT-孔板前端管道内的绝对压力,kPaPT=PD±PGPD-测量地点的大气压力,kPaPG-观测点管道内压力,正压取+,负压取-,kPa换算关系:1标准大气压=101.325kPa101.3251mmH2O=9.80665Pa9.806651mmHg=0.133322kPa0.133322QHKX⊿HtPGPD(m3/min)%mmH2O℃mmHgkPa13.106761.28562424512320803.145623#N/A1.285604512#N/A80#N/A1.285601512#N/A80#N/A1.285601012#N/A80QHKX⊿HtPGPD(m3/min)%mmH2O℃mmHgkPa13.106760.71366105151512081.2538#N/A34.5#N/A33.7#N/A