摘要
在所建的两段式固定床反应器上,以典型烟煤为原料,开展了一定热解条件(600℃、1-2 s)下所产生的热解气体(煤气、焦油)在不同裂解温度(500-800℃)时,停留时间(0-16 s)对最终热解产物特性影响的实验研究。研究表明:在低于600℃较低裂解温度条件下,热解气停留时间对烟煤热解产物影响不大;而在高于600℃裂解温度条件下,随着热解气停留时间从0 s增加到16 s,气相二次反应加剧,大分子焦油在分解反应、缩聚反应共同作用下倾向于形成更为稳定的苯、甲苯、二甲苯和萘、甲基萘、菲、蒽等多环芳烃及H2,同时酚类先增多后分解形成CO,芳香侧链等脱甲基形成CH4。
On a two section type fixed bed reactor constructed or built,with a typical bituminous coal serving as the raw material,experimentally studied was the influence of the residence time( 0 to 16 seconds) of pyrolytic gases thus produced( coal gas and coal tar) under a certain pyrolytic condition( 600 ℃,1 to 2 seconds) on the characteristics of the final pyrolytic products. It has been found that under the condition of a relatively low cracking temperature of600 ℃,the residence time of pyrolytic gases has no big influence on the pyrolytic products of bituminous coal while under the condition of a cracking temperature of higher than 600 ℃,with an increase of the residence time of the pyrolytic gases from 0 to 16 seconds,the gas phase secondary reaction will become intensified and the coal tar with large molecules will tend to form more stable benzenes,toluene,xylene and polycyclic aromatic hydrocarbons( PAH),such as naphthalene,methyl naphthalene,phenanthrene and anthracene and hydrogen under the joint action of the decomposition and polycondensation reactions and in the meantime,the phenols will first increase and then decompose to form CO,the aromatic side chains and others will form CH4 through demethylation.
出处
《热能动力工程》
CAS
CSCD
北大核心
2015年第5期756-761,826-827,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家"863"高技术研究发展计划资助项目(2013AA051203)
关键词
二次反应
热解气停留时间
烟煤
热解产物
secondary reaction,residence time of pyrolytic gases,bituminous coal
