原料组成结构对热解挥发物反应及析炭形成过程影响机制的研究
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摘要:
以生物质、污泥和煤3种结构差异较大的物质为原料,研究其组成结构特性对挥发物反应及析炭形成过程的影响.结果表明,煤结构中芳香碳含量高,更有利于半焦的形成;生物质结构中脂肪环醚的含量高,有利于焦油的产生;污泥结构中羧基和羰基碳含量高,更有利于小分子气体生成.生物质和煤中芳香碳较多,其沉积在反应器管壁的析炭(Coke-D)产率更高,分别为0.3%(质量分数)和1.4%(质量分数);而污泥中芳香碳占比少,生成的析炭分子量较小,主要悬浮在焦油中(Coke-S).添加高铝球改变反应程度后,由于生物质和污泥挥发物中含O、N原子的化合物含量高,挥发物更易断裂,小分子物质缩聚明显,造成Coke-S产率均明显增加,其中生物质中Coke-S增加率高达70%.而煤热解挥发物中重质组分含量高,形成的析炭芳香结构更加致密,易沉积在反应器(Coke-D)和高铝球表面(Coke-A),生成了更多的Coke-D(1.5%,质量分数)和Coke-A(0.2%,质量分数).焦油气析炭过程因原料结构的差异而有所不同.
In this paper,biomass,sludge and coal,with different structures,are used as raw materials to study the effect of its structural characteristics on the volatile reaction and coke formation process.The results showed that the content of aromatic carbon in coal structure was higher,which was conducive to the formation of semi-coke,while the high content of aliphatic cyclic ether in biomass was beneficial to the production of tar.The carboxyl and carbonyl carbon contents in sludge were high,which were easier to decompose into small molecular gas compounds.The biomass and coal had a higher yield of coke deposition on the reactor(Coke-D),respectively reached to 0.3%(mass fraction)and 1.4%(mass fraction),due to its higher proportion of aromatic carbon.Conversely,coke in sludge is mainly suspended in tar(Coke-S),because its aromatic carbon accounts for a small proportion and the generated molecular weight of coke is smaller.It was found that the yields of Coke-S over the biomass and sludge were significantly improved after changing the degree of reaction by adding the packing medium(high aluminum ball),wherein,the increase rate of Coke-S in biomass reached to 70%.This might be that the contents of compounds containing O and N atoms in the volatiles of biomass and sludge were high,the volatiles were more likely to break,and the condensation of small molecular substances was obvious.However,the coke derived from coal pyrolysis was inclined to deposit on the surfaces of the reactor and the high aluminum ball due to the fact that the coal pyrolysis volatiles had high content of heavy components and the formed-coke has a denser aromatic structure after changing the degree of reaction,resulting in the increase in the yields of Coke-D(1.5%,mass fraction)and Coke-A(0.2%,mass fraction),respectively.The coking formation process of tar gas was different due to the diverse structures of the raw material.
作者:
刘倩 王倩 李晓荣 田茜 李挺 王美君 常丽萍 闫伦靖
Liu Qian;Wang Qian;Li Xiaorong;Tian Qian;Li Ting;Wang Meijun;Chang Liping;Yan Lunjing(School of Chemistry and Engineering Technology,State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China;Department of Energy Chemistry and Materials Engineering,Shanxi Institute of Energy,Jinzhong 030600,China)
机构地区:
太原理工大学化学工程与技术学院
出处:
《河南师范大学学报(自然科学版)》 CAS 2024年第1期124-134,共11页
Journal of Henan Normal University(Natural Science Edition)
基金:
国家自然科学基金(22078224) 山西省基础研究计划资助项目(20210302123193)。
关键词:
原料结构 挥发物组成 挥发物反应 析炭形成
materials structure composition of volatiles volatiles reaction coke formation
分类号:
TQ530.2 [化学工程—煤化学工程]
