CIESC Journal ›› 2022, Vol. 73 ›› Issue (3): 1359-1368.DOI: 10.11949/0438-1157.20211437

• Energy and environmental engineering • Previous Articles     Next Articles

Biomass chemical-looping gasification characteristics of K-modified BaFe2O4 oxygen carrier

Cong YUAN1,2(),Ge PU1,2(),Jie GAO1,2,Shuaihui JIA1,2   

  1. 1.Key Laboratory of Low-Grade Energy Utilization Technologies & Systems of Ministry of Education, Chongqing 400044, China
    2.School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
  • Received:2021-10-09 Revised:2021-12-17 Online:2022-03-14 Published:2022-03-15
  • Contact: Ge PU

改性BaFe2O4载氧体生物质化学链气化特性

袁聪1,2(),蒲舸1,2(),高杰1,2,贾帅辉1,2   

  1. 1.低品位能源利用技术及系统教育部重点实验室,重庆 400044
    2.重庆大学能源与动力工程学院,重庆 400044
  • 通讯作者: 蒲舸
  • 作者简介:袁聪(1996—),男,硕士研究生,yuancong@cqu.edu.cn
  • 基金资助:
    重庆市重点产业共性关键技术创新专项(cstc2016zdcy-ztzx0024)

Abstract:

The BaFe2O4 oxygen carrier and BaFe2O4 oxygen carrier modified by Ni, Ce and K were prepared by the sol-gel method, and the best oxygen carrier was selected as 10%(mass) K modified BaFe2O4 (10K-BF), and the difference was explored. The effect of reaction conditions on its performance was characterized by H2-TPR, XRD, SEM, and BET on the oxygen carrier. The experimental results showed that the addition of Ni, Ce and K all increase the syngas yield. The 10K-BF oxygen carrier exhibited the best performance when the mass ratio of steam to biomass (S/B) was equal to 3, peroxygen coefficient α=0.20 and t=800℃. Its syngas yield was 1.864 m3/(kg Biomass), hydrogen production rate was 1.038 m3/(kg Biomass), carbon conversion rate was 90.49% and carbon deposition rate was 1.33%. After 10 cycles, there was still a high syngas yield and carbon conversion rate. H2-TPR result indicated that the 10K-BF oxygen carrier starts to release oxygen at 300°C and can participate in the reaction at the initial stage of biomass pyrolysis, which is beneficial to the cracking of tar. XRD characterization showed that the 10K-BF oxygen carrier can recover part of the spinel structure after regeneration.

Key words: biomass, gasification, syngas, carbon deposition rate, barium ferrite

摘要:

以溶胶凝胶法制备了BaFe2O4载氧体以及Ni、Ce、K修饰的BaFe2O4载氧体,筛选出最佳载氧体为10%(质量)K修饰的BaFe2O4载氧体(10K-BF),探究了不同反应条件对其性能的影响,通过H2-TPR、XRD、SEM、BET对载氧体表征。实验结果表明,Ni、Ce、K的添加均提高了载氧体的合成气产率,10K-BF载氧体在水蒸气与生物质质量比(S/B)等于3,过氧系数α=0.20,反应温度800℃时,气化效果最好,合成气产率1.864 m3/(kg Biomass),氢气产率1.038 m3/(kg Biomass),碳转化率90.49%,积炭率1.33%,10次循环后仍有较高的气体产率及碳转化率。H2-TPR表明10K-BF载氧体在300℃开始释氧,在生物质热解的初始阶段即可参与反应,有利于焦油的裂解;XRD表明10K-BF载氧体再生后可以恢复部分尖晶石结构。

关键词: 生物质, 气化, 合成气, 积炭率, 铁酸钡

CLC Number: