反应温度及压力对三塘湖盆地褐煤热解产物分布影响  

Effects of reaction temperature and pressure on the distribution of lignite pyrolysis products in Santanghu Basin

作　　者：王兴刚 焦立新 曹志雄 李斌[1] 韩波 黄蝶芳 富永红 李鑫 WANG Xinggang;JIAO Lixin;CAO Zhixiong;LI Bin;HAN Bo;HUANG Diefang;FU Yonghong;LI Xin(Exploration and Development Research Institution,China Petroleum Tuha Oilfield Branch,Hami839000,China;Institute of Geology,China Petroleum Logging Co.,Ltd.,Karamay834000,China;College of Geology and Mining Engineering,Xinjiang University,Urumqi830000,China)

机构地区：[1]中国石油吐哈油田分公司勘探开发研究院,新疆维吾尔自治区哈密839009 [2]中国石油测井有限公司地质研究院,新疆维吾尔自治区克拉玛依834000 [3]新疆大学地质与矿业工程学院,新疆维吾尔自治区乌鲁木齐830000

出　　处：《洁净煤技术》2024年第6期114-127,共14页Clean Coal Technology

基　　金：中国石油科技专项资助项目(2021DJ3805);国家自然科学基金资助项目(42002188);新疆维吾尔自治区天山英才计划资助项目(2022TSYCCX0043)。

摘　　要：煤在气化通道中气化反应效率是影响煤炭地下气化气体组分与热值的关键问题。为揭示反应温度和压力对三塘湖盆地褐煤在水蒸气中气化行为和产物分布特征影响,基于固定床热解炉对三塘湖盆地西山窑组褐煤进行不同反应温度和压力热解试验。结果表明:随反应温度升高(300~900℃),气体质量分数由3.84%增至24.29%,水和焦油质量分数先增后减;高温下反应温度升高,加剧二次反应,H_(2)和CH_(4)体积显著增加,900℃体积最大分别为100.89、106.09 mL/g,污染物总质量减少,900℃质量分数相对小,17.72 mg/g。增加反应压力(1.5~3.0 MPa),利于提高半焦转化率和增加气体质量分数。高温下反应压力增加,加剧二次反应,利于反应加氢气化和甲烷化发生,导致CH_(4)体积显著增加,700℃CH_(4)体积最多增加26.89 mL/g,但在700℃会促进自由基加氢饱和反应,污染物总质量增加。建议在实际生产中,通过控制注汽移动速度适当增加反应温度并提高反应压力,且控制气化反应区的温度远离700℃,利于H_(2)和CH_(4)生成,以提高煤炭地下气化工艺高效清洁开发。研究成果可为三塘湖盆地西山窑组褐煤煤炭地下气化工艺提供指导。The gasification reaction efficiency of coal in the gasification channel is a key issue affecting the gas composition and calorific value of underground coal gasification.To reveal the effects of reaction temperature and pressure on the gasification behavior and product distribution characteristics of lignite in water vapor using the coal deposited in the Santanghu Basin,pyrolysis experiments were carried out using lignite collected from the Xishanyao Formation of the Santanghu Basin based on a fixed-bed pyrolysis furnace under different reaction temperatures and pressures.With the increase of reaction temperature(300-900℃),the gas mass fraction increased from 3.84%to 24.29%,and the mass fractions of water and tar increased first and then decreased.The volume of H_(2) and CH_(4) increased significantly with the increase of reaction temperature,with the maximum volume of 100.89 and 106.09 mL/g at 900℃,respectively.The total mass of pol-lutants decreases,and the mass is relatively small at 900℃,17.72 mg/g.Increasing the reaction pressure(1.5-3.0 MPa)is beneficial to improve the conversion of semi-coke and increase the gas mass fraction.The increase of reaction pressure aggravates the secondary reac-tion,which is conducive to the occurrence of hydrogasification reaction and methanation reaction,resulting in a significant increase in the volume of CH_(4).At 700℃,the volume of CH_(4) increases by up to 26.89 mL/g.However at 700℃,the free radical hydrogenation satura-tion reaction is promoted,resulting in an increase in the total mass of pollutants.It is suggested that in the actual production,the reaction temperature and pressure should be increased by controlling the moving speed of steam injection,and the temperature of gasification reac-tion zone should be controlled away from 700℃,which is beneficial to the formation of H_(2) and CH_(4),so as to improve the efficiency and clean development of underground coal gasification process.The research results can provide guidance for the underground coal gasifi

关 键 词：三塘湖盆地 煤热解 水蒸气氛围 反应温度 反应压力 

分 类 号：TQ54[化学工程—煤化学工程]