陕北富油煤热解提油产物分布特性研究  

Distributions of products from the pyrolysis of tar-rich coals for tar extraction in northern Shaanxi Province,China

作　　者：俞尊义 郭伟 杨盼曦 高琨 杨甫 马丽 王晶 李红强 杨伯伦[1,2] 吴志强 YU Zunyi;GUO Wei;YANG Panxi;GAO Kun;YANG Fu;MA Li;WANG Jing;LI Hongqiang;YANG Bolun;WU Zhiqiang(School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China;Shaanxi Province Energy and Chemical Process Strengthening Key Laboratory,Xi’an 710049,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural and Resources,Xi’an 710021,China;Shaanxi Coal Geology Group Co.,Ltd.,Xi’an 710021,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学化学工程与技术学院,陕西西安710049 [2]陕西省能源化工过程强化重点实验室,陕西西安710049 [3]自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710021 [4]陕西省煤田地质集团有限公司,陕西西安710021 [5]西安交通大学电气工程学院,陕西西安710049

出　　处：《煤田地质与勘探》2024年第7期176-188,共13页Coal Geology & Exploration

基　　金：自然资源部煤炭资源勘查与综合利用重点实验室项目(SMDZ-2023-Z020);陕西省创新能力支持计划项目(2023-KJXX-004,2022KXJ-126)。

摘　　要：【目的】富油煤是集煤、油、气属性于一体的特殊煤炭资源,富含带有脂肪结构的侧链和桥键等富氢结构,在热解过程中易裂解生成焦油和煤气,是实现煤热转化制油气的理想原材料。目前关于富油煤热解提油相关研究尚处于起步阶段,探究热载体类型、升温类型、热解温度等工艺条件对热解过程的影响,对于优化富油煤热解制油气工艺具有重大意义。【方法】以陕北神木富油煤为研究对象探究其在CO_(2)、N_(2)等不同气体热载体条件下热解的油气产出特性,并利用响应面分析法建立富油煤热解所得焦油产率和轻质焦油产率受关键因素影响的回归模型,探究升温类型、气体热载体类型、热解温度三因素交互作用对二者的影响以及焦油产率和轻质焦油产率最大时的最优反应条件。【结果和结论】结果显示:慢速热解过程中,焦油产率在N_(2)气氛下随温度升高呈先升后降趋势,在550℃时最高为10.50%;轻质焦油产率不断增加,在600℃时达到60.67%。相比N_(2)气氛,CO_(2)气氛下,焦油产率和气体产率均有所升高,轻质焦油产率进一步提高,最高达63.67%,焦油中芳香烃和含氧化合物含量也有所升高。相比于慢速热解,富油煤在两种气体热载体条件下快速热解所得焦油产率均有所升高,600℃时CO_(2)气氛下最高(11.71%),焦油中酚油、蒽油等含量增加,轻质焦油产率下降,焦油中酚类、脂肪烃、含氧化合物含量有所增加,热解气中H_(2)和CH_(4)浓度有所降低。基于响应面分析得到三因素对焦油产率和轻质焦油产率影响的显著性顺序均为:热解温度>气体热载体类型>升温类型。以最大焦油产率和最大轻质焦油产率为目标,利用回归模型优化得到最优热解工艺分别为:快速热解、CO_(2)气氛、595℃和慢速热解、CO_(2)气氛、558℃,最优预测值分别为11.72%和60.75%。经过实验验证确定最优条件下的焦油产�[Objective]Tar-rich coals stand as a special type of coal resource that integrates coal,oil,and gas properties.These coals,boasting abundant hydrogen-rich structures such as side chains and bridge bonds with aliphatic structures,are prone to crack and produce tar and gas during pyrolysis.These establish tar-rich coals as ideal raw materials that produce oil and gas through thermal conversion.Presently,the research into tar extraction from tar-rich coals through pyrolysis remains in its initial stage,and exploring the impacts of technological conditions,including heat carrier,heating type,and pyrolysis temperature,on the pyrolysis process holds critical significance for optimizing the pyrolysis for oil and gas extraction.[Methods]Focusing on the tar-rich coals from the Shenmu mining area in northern Shaanxi Province,this study delved into the production characteristics of oil and gas from the pyrolysis of tar-rich coals under gaseous heat carriers CO_(2) and N_(2).Using the response surface methodology,this study constructed regression models to explore the impacts of several critical factors on both tar yield and light tar yield obtained from the pyrolysis of tar-rich coals.Using these regression models,this study investigated the impacts of the interactions among the heating type,gaseous heat carrier type,and pyrolysis temperature on the tar yield and light tar yield,along with the optimal reaction conditions for the maximum yields.[Results and Conclusions]The results of this study are as follows:(1)In the case of slow pyrolysis,under the N_(2) atmosphere,the tar yield increased first and then decreased as the temperature rose,reaching a maximum of 10.50%at 550℃,while the light tar yield kept increasing,reaching 60.67%at 600℃.In contrast,under the CO_(2) atmosphere,both the tar yield and the gas yield were elevated.Meanwhile,the light tar yield further increased under the CO_(2) atmosphere,reaching a maximum of 63.67%,with the contents of aromatic hydrocarbons and oxygen-containing compounds in the tar also

关 键 词：富油煤 气体热载体类型 升温类型 热解提油 响应面法 

分 类 号：TQ530[化学工程—煤化学工程]