摘要
采用微型固定床反应器,研究了劣质重油流化脱碳改质接触剂上焦炭与O2、H2O(g)和O2-H2O(g)混合气的气化反应,考察了反应温度、气化剂组成、反应时间对气体产物组成以及焦炭转化率的影响。结果表明,采用O2为气化剂时,焦炭气化反应的主要产物CO与CO2的摩尔比(n(CO)/n(CO2))随反应温度提高先升高后降低。采用H2O(g)为气化剂时,焦炭气化产物主要由H2、CO、CO2及微量CH4组成;在1025～1149K范围,反应温度对气化产物组成的影响较小,反应温度1025K、反应时间多于25min时,气体产物中CO+H2的体积分数在87%以上,反应温度高于1049K时,焦炭转化率明显提高。采用O2-H2O(g)混合气作为气化剂,且气化剂中O2体积分数较低时,焦炭气化反应产物组成与采用H2O(g)作为气化剂时的类似,但随着O2体积分数增加,产物中H2体积分数大幅下降;气化剂中O2体积分数大于10%时,产物中H2体积分数几乎为零,产物组成与采用O2作为气化剂时的类似;焦炭转化率随着O2体积分数和反应温度的升高而增加。
The gasification of the coke deposited on the catalyst for inferior heavy oil decarburizing was investigated with O2, H2O（g） and O2-H2O（g） mixture as gasifying agents in a micro-fixed bed at temperature range of 873-1073 K. The effects of reaction temperature, gasifying agent volume fraction and reaction time on product composition and coke conversion were determined. The results showed that with O2 as the gasifying agent, CO and CO2 were the maior gaseous products in coke gasification and n（CO）/n（CO2） increased with the increase of temperature. With H2O（g） as the gasifying agent the products of coke gasification comprised of H2, CO, CO2, and a bit of CH4, and the effect of reaction temperature on the product composition was not significant, but the coke conversion increased rapidly at the temperature above 1049 K. The volume fraction of CO＋H2 exceeded 87% as gasification at 1O25 K for 25 min, and the coke conversion increased with the increase of reaction time. With O2-H2O（g） mixture as the gasifying agent the product composition of coke gasification was similar to that with H2O（g） as gasifying agent in which the O2 volume fraction was low, however, the H2 volume fraction decreased greatly when the O2 volume fraction increased and close to zero as O2 volume fraction of higher than 10%. At the same time, the product composition was resembled to that with O2 as the gasifying agent. In addition, the coke conversion was increased with the increase of O2 volume fraction and reaction temperature.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2013年第1期20-27,共8页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(21176252)资助
关键词
劣质重油
脱碳
接触剂
焦炭
气化
inferior heavy oil
decarburizing
catalyst
coke
gasification
