瓦斯含量计算方法.doc

瓦斯含量计算方法、游离瓦斯量的计算计算公式如下：W游-游离瓦斯，M3/t； 吸附瓦斯吸附瓦斯计算公式如下：W吸 -吸附瓦斯，M3/t；a、b-吸附常数； 若没有试验室的a、b常数，也可根据煤的工业分析采用下列经验公式计算：e-自然对数。 目前我国采掘深度下游离瓦斯在瓦斯含量中所占的比重较大，约占75%以上， 并随深度的增加而加大，瓦斯含量（W含）根据实验室中的测定，在不同瓦斯压力下（相当不同埋藏深度），游离瓦斯和吸附瓦斯在煤的瓦斯含量中所占的比重见表：游离瓦斯和吸附瓦斯在煤的瓦斯含量中所占的比重表瓦斯压力（Mpa）游离瓦斯（W游）%吸附瓦斯（W吸）% 013496971012158588201520808550354555651006070304020079802030300808515205008588121570086891114100089901012利用瓦斯含量系数计算煤层瓦斯含量如果计算要求不高，可以用瓦斯含量与瓦斯压力的经验公式，根据煤层瓦斯压力确定煤层中的瓦斯含量。瓦斯含量与瓦斯压力有下列关系式瓦斯含量系数与煤的挥发分关系对照表挥发分%挥发分%挥发分%518.18179.809296.773617.069189.455306.596715.88199.126316.419814.944208.822326.267914.11218.519336.0581013.376228.266345.9891112.7186237.987355.8371212.111247.76365.7111311.58257.757375.5841411.0742267.33385.4581510.704277.178395.3561610.188286.893405.255瓦斯含量的W0的另一个公示。W0可按下列经验公式确定，当挥发分小于20%的煤层当挥发分大于21%的煤层t-煤层温度，摄氏温度p-买深为H处的瓦斯压力，Mpa；可用下式确定H0-瓦斯风化带的深度，mAa-煤层的灰分，%；Wa-煤层的水分，%；d-煤的密度（真比重），t/m3； s-煤的视比重（假比重），t/m3；煤的密度可用下列经验公式求出；当煤中Aa20%时Kt-沼气压缩系数，查表沼气压缩系数Kt与温度及压力关系表压力（Mpa）温 度备注001002003004005000.11.01.041.081.121.161.2010.971.021.061.101.141.1820.951.001.041.081.121.1630.920.971.021.061.101.1440.900.951.001.041.081.1250.870.930.981.021.061.1160.850.900.951.01.051.1070.830.860.930.981.041.09A、B、C数据由下表查出VrABCVrABC备注3.00.194418.2010.3689230.09316.0880.27333.50.185116.9150.3664230.09235.8720.26334.00.177515.7730.3639240.09155.8360.26324.50.171214.9370.3614250.09065.5250.25825.00.165814.1590.3588260.08985.5620.25325.50.160913.3610.3563270.08895.5340.24816.00.156612.8850.3538280.08815.3480.24316.50.152812.3690.3513290.08735.2420.23817.00.149411.8810.3488300.08655.1360.23307.50.146111.4450.3463310.08575.0200.22808.00.143211.0470.3437320.08484.9220.22308.50.140510.6530.3412330.08394.8140.21799.00.138010.3320.3387340.08324.7200.212910.00.13349.6910.3337350.08234.6120.2079110.12949.1610.3286360.08154.4900.2029120.12568.5650.3236370.08074.4050.1978130.12238.2390.3186380.07994.3040.1928140.11927.8770.3135390.07904.2010.1878150.11647.6910.3085400.07824.1020.1827160.11377.2520.3035410.07733.9920.1777170.11127.0070.2985420.07663.9080.1727180.10886.7740.2934430.07583.8120.1676190.10666.5750.2884440.07493.6940.1625200.10446.3810.2834450.07403.5960.1576210.10226.2070.2783瓦斯含量计算实例例如：某矿垂深（H）为400m，瓦斯压力为3.9Mpa,挥发分（Vr）为15%，灰分（Af）为4%，水分（Wf）为1%，煤的含氢量（H2）为4。4%，地