【正文】 ...................................................................................... 13 煤層瓦斯基本參數(shù) .................................................................................................... 13 煤層瓦斯含量 .................................................................................................. 13 煤層瓦斯壓力 .................................................................................................. 13 煤層透氣性系數(shù) .............................................................................................. 14 鉆孔瓦斯流量和流量衰減系數(shù) ...................................................................... 14 礦井瓦斯儲(chǔ)量 ............................................................................................................ 14 計(jì)算范圍 .......................................................................................................... 14 河南理工大學(xué)本科畢業(yè)設(shè)計(jì) IV 計(jì)算方法 .......................................................................................................... 14 礦井可抽瓦斯量及 可抽期 ........................................................................................ 15 瓦斯抽放率 ...................................................................................................... 15 礦井可抽瓦斯量 .............................................................................................. 16 可抽期 .............................................................................................................. 16 4 瓦斯抽放的必要性和可行性論證 ...................................................................................... 17 瓦斯抽放的必要性 .................................................................................................... 17 規(guī)定 .................................................................................................................. 17 礦井瓦斯涌出量預(yù)測(cè) ...................................................................................... 17 瓦斯抽放的可行性 .................................................................................................... 24 5 抽放方法 .............................................................................................................................. 25 規(guī)定 ............................................................................................................................ 25 礦井瓦斯來(lái)源分析 .................................................................................................... 25 礦井瓦斯涌出及構(gòu)成 ...................................................................................... 25 回采工作面瓦斯涌出及構(gòu)成 .......................................................................... 26 采空區(qū)瓦斯涌出及構(gòu)成 .................................................................................. 26 抽放方法選擇 ............................................................................................................ 26 本煤層瓦斯抽放方法 ...................................................................................... 26 鄰近層瓦斯抽放方法 ...................................................................................... 27 采空區(qū)瓦斯抽放方法 ...................................................................................... 27 其他情況 .......................................................................................................... 27 抽采方法確定 .................................................................................................. 27 鉆孔及鉆場(chǎng)布置 ........................................................................................................ 27 鉆孔及鉆場(chǎng)布置 .............................................................................................. 27 順層鉆孔布置 .................................................................................................. 28 底板抽放鉆孔布置 .......................................................................................... 29 邊掘邊抽鉆孔布置 .......................................................................................... 29 底板水平鉆孔布置 : ......................................................................................... 30 河南理工大學(xué)本科畢業(yè)設(shè)計(jì) V 采空區(qū)埋管布置 .............................................................................................. 30 封孔方法 .................................................................................................................... 31 封孔深度 .......................................................................................................... 31 封孔材料 .......................................................................................................... 31 封孔工藝 .......................................................................................................... 31 抽放瓦斯量預(yù)計(jì) ........................................................................................................ 33 6 瓦斯抽放管路系統(tǒng)及設(shè)備選型 .......................................................................................... 34 抽放管路選型及阻力計(jì)算 ........................................................................................ 34 規(guī)定 .................................................................................................................. 34 計(jì)算方法 .......................................................................................................... 34 瓦斯抽放泵選型 ........................................................................................................ 38 規(guī)定 .................................................................................................................. 38 選型原則 .......................................................................................................... 38 選型依據(jù) .......................................................................................................... 38 計(jì)算 方法 .......................................................................................................... 38 瓦斯泵類(lèi)型 ...................................................................................................... 40