石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (6): 1294-1305.doi: 10.3969/j.issn.1001-8719.2020.06.020

• 化学链气化 • 上一篇    下一篇

加压流化床反应器中煤焦化学链气化实验与数值模拟研究

郭欣桐,常国璋,谭晓莉,胡修德,郭庆杰   

  1. 宁夏大学 省部共建煤炭高效利用与绿色化工国家重点实验室 化学化工学院,宁夏 银川 750021

  • 收稿日期:2020-04-20 修回日期:2020-08-13 出版日期:2020-11-25 发布日期:2020-12-02
  • 通讯作者: 郭庆杰,男,教授,博士,从事煤炭清洁利用研究,E-mail:qingjie_guo@163.com E-mail:qjguo@qust.edu.cn
  • 作者简介:第一作者:郭欣桐,男,博士研究生,从事煤炭化学链气化研究,E-mail:mr_guoxintong@163.com
  • 基金资助:
    国家重点研发计划课题(2018YFB0605401),国家自然科学基金项目(21868025),宁夏高等学校一流学科建设(化学工程与技术学科)项目(NXYLXK2017A04), 宁夏回族自治区重点研发计划项目(2018BCE01002和2016BY005), 宁夏自然科学基金项目(2020AAC03020)基金资助

Experimental and Numerical Research on Chemical Looping Gasification of Coal Char in a Pressured Fluidized Bed Reactor

GUO Xintong, CHANG Guozhang, TAN Xiaoli, HU Xiude, GUO Qingjie   

  1.  School of Chemistry and Chemical Engineering, State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
  • Received:2020-04-20 Revised:2020-08-13 Online:2020-11-25 Published:2020-12-02
  • Supported by:
     

摘要:

采用CPFD模拟和实验相结合的方法,研究了0.1~0.5 MPa压力条件下,鄂尔多斯烟煤焦和Fe2O3/Al2O3载氧体(OC)的流动特性及气化反应行为。结果表明,颗粒体积分数是影响加压下煤气化速率和合成气品质的关键因素,当颗粒体积分数在1.0%~2.8%区间、操作压力从0.1 MPa加压至0.3 MPa时,煤焦气化速率增长2.7倍,合成气摩尔分数由72%增长至78%。操作压力及颗粒流态的改变对水煤气变换反应速率无显著影响,通过煤焦气化反应和载氧体还原反应的耦合可实现合成气组分比例的调控。XRD表征显示Fe基载氧体各还原态组分分布与模拟结果一致。操作压力升至0.3 MPa,载氧体还原反应速率的增幅减小,释氧量增大50.18%;继续升压至0.5 MPa,显著促进了载氧体还原反应速率的增加,但释氧量仅增加3.92%。

关键词: 化学链, 煤焦气化, 压力, 数值模拟, 铁基载氧体

Abstract:

Combined CPFD simulations and experiments were used to study the gasification of Erdos bituminous coal char with Fe2O3/Al2O3 under the pressure of 0.1-0.5 MPa. The results showed that the particle volume fraction was the key factor affecting the coal gasification rate and the syngas quality under given pressures. When particle volume fraction ranged from 1.0% to 2.8%, the gasification rate of coal char increased by 2.7 times and the syngas molar fraction increased from 72% to 78% with the pressure of 0.1-0.3 MPa. The composition of syngas was not obviously changed by the variations of pressure and particle fluidization during water-gas shift reaction. The XRD characterization explored that the distribution of each reduction state of Fe-base oxygen carrier (OC) was consistent with the simulation results. At the pressure of 0.3 MPa, the increase of reduction rate of OC was decelerated and the total oxygen release increased by 50.18%. With the pressure reaching 0.5 MPa, the reduction rate was significantly promoted, but the total oxygen release was increased by only 3.92%.

Key words: chemical-looping, coal char gasification, pressure, numerical simulation, iron-based oxygen carrier

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