原位条件下无烟煤热解产物随温度变化研究
Study on variation of anthracite pyrolysis products with temperature under in-situ conditions
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摘要: 为了研究深埋深无烟煤原位热解采气过程中的气体产物产量特性，采用高温高压三轴试验仪和气相色谱仪，获得100～600 ℃内无烟煤的热解产气量和产物，分析了产物和渗透性之间的关系。研究表明热解产气量随温度的变化可分为4个阶段：在100～200 ℃范围内为第1阶段（脱气阶段），无烟煤产生少部气体，析出的气体主要 N2和O2；在300～400 ℃范围内为第2阶段（热解起始阶段），无烟煤进一步热解，气体产量进一步上升，气体主要由煤热解产生的CH4、CO2、H2和C2H6等组成，400 ℃是热解产气量第1个峰值；在400～500 ℃范围内为第3阶段（热解阶段），由于无烟煤中有机物质的热稳定性所致，导致产气量降低；在500～600 ℃范围内为第4阶段（裂解阶段），热解气体产量又一次持续增加，该部分气体主要为CH4、C2H6和H2；渗透率受热解过程中的产物影响，300 ℃是低渗透煤层注热开采瓦斯合理的注热温度。Abstract: To study the gas product yield characteristics during in-situ pyrolysis of deep buried anthracite for gas extraction, high-temperature and high-pressure triaxial tester and gas chromatography were used to obtain the pyrolysis gas yield and products of anthracite in the range of 100-600 ℃. The relationship between product and permeability was analyzed. The study showed that the variation of pyrolysis gas yield with temperature can be divided into four stages: the first stage（ｄｅｇａｓｓｉｎｇ ｓｔａｇｅ） from 100 ℃ to 200 °C, where the anthracite produces small amounts of gas and the precipitated gas is mainly N2 and O2. The second stage ａｙａyrolysis initiation stage） from 300 ℃ to 400 ℃, where the anthracite coal is further pyrolyzed and the gas yield further increases, and the gas is mainly composed of CH4, CO2, H2 and C2H6 produced by coal pyrolysis. 400 ℃ is the first peak of pyrolysis gas production. The range of 400-500 ℃ is the third stage（ｐｙｒｏｌｙｓｉｓ ｓｔａｇｅ）, due to the thermal stability of organic substances in anthracite, resulting in lower gas production. The range of 500-600 ℃ is the fourth stage（ｃｒａｃｋｉｎｇ ｓｔａｇｅ）, and pyrolysis gas production once again continues to increase. The permeability is influenced by the gas yield and gas production during pyrolysis.
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Keywords:
- anthracite coal /
- in-situ heat injection /
- carbon emissions /
- pyrolysis gas /
- gas extraction
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