欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2020, Vol. 20 ›› Issue (3): 362-370.DOI: 10.12034/j.issn.1009-606X.219210

• 环境与能源 • 上一篇    

城市污泥与稻壳水热炭混合燃烧特性与动力学

叶 聪1,2, 邢献军1,2,3,4*, 张学飞2,3, 陈 涛1,2, 张佳佳1,2   

  1. 1. 合肥工业大学资源与环境工程学院,安徽 合肥 230009 2. 合肥工业大学先进能源技术与装备研究院,安徽 合肥 230009 3. 合肥工业大学机械工程学院,安徽 合肥 230009 4. 国家城市能源计量中心(安徽),安徽 合肥 230051
  • 收稿日期:2019-05-22 修回日期:2019-07-12 出版日期:2020-03-22 发布日期:2020-03-20
  • 通讯作者: 邢献军
  • 基金资助:
    北京市教育委员会市属高校创新能力提升计划项目

Co-combustion characteristics and kinetics of municipal sludge and rice husk hydrochar

Cong YE1,2, Xianjun XING1,2,3,4*, Xuefei ZHANG2,3, Tao CHEN1,2, Jiajia ZHANG1,2   

  1. 1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009, China 2. Advanced Energy Technology and Equipment Research Institute, Hefei University of Technology, Hefei, Anhui 230009, China 3. School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China 4. National City Energy Measurement Center (Anhui), Hefei, Anhui 230051, China
  • Received:2019-05-22 Revised:2019-07-12 Online:2020-03-22 Published:2020-03-20
  • Contact: Xian-Jun XING

摘要: 采用热重分析法研究城市污泥、稻壳水热炭及两者不同掺混比的燃烧特性与反应动力学。对比分析其在不同升温速率下从室温升至1000℃的燃烧特性,用Flynn-Wall-Ozawa (FWO)法计算其燃烧过程中的反应动力学参数。结果表明,稻壳水热炭的挥发性、着火和燃尽指数均高于城市污泥,具有较好的燃烧特性,掺混稻壳水热炭使城市污泥混合燃烧时发生热滞后现象。随着稻壳水热炭掺混比的增加,共混物的燃烧残余质量减少,着火性能变差,燃烧性能变强。活化能的相关系数均高于0.95,稻壳水热炭掺混高于50wt%时,共混物的平均活化能低于稻壳水热炭单独燃烧的平均活化能,掺混70wt%稻壳水热炭时出现最低平均活化能,为85.48 kJ/mol。城市污泥与稻壳水热炭混燃时有协同交互作用,且掺混50wt%稻壳水热炭时效果最佳。

关键词: 城市污泥, 水热炭, 动力学, 混合燃烧, 活化能

Abstract: In recent years, there is very little report on the characteristics of the co-combustion between municipal sludge and biomass charcoal. Therefore, the thermal characteristics and kinetics of municipal sludge, rice husk hydrochar and their blends in the combustion process were investigated in this work. The mass percentages of rice husk hydrochar of in the blends were 10wt%, 30wt%, 50wt%, 70wt% and 90wt%, respectively. The experiments were performed via a thermogravimetric simultaneous thermal analyzer at different heating rates (10, 20 and 40℃/min) with a changing temperature ranged from room temperature to 1000℃. Meanwhile, the Flynn-Wall-Ozawa (FWO) method was used to calculate the reaction kinetic parameters during these combustion processes. The results showed that the mass of volatility, ignition and burnout index of rice husk hydrochar were all higher than those of municipal sludge and rice husk hydrochar had good combustion characteristics. As the ratio of mixed rice husk hydrochar increased, the residual mass of the mixture reduced and the ignition performance worsened, however, the combustion performance enhanced. And the correlation coefficient of the activation energy of the combustion of rice husk hydrochar, municipal sludge and their mixture were all higher than 0.95. When the ratio of rice husk hydrochar blended in municipal sludge was higher than 50wt%, the average activation energy of co-combustion was lower than the average activation energy of rice husk hydrochar burned alone, when the ratio reached 70wt%, the lowest average activation energy of 85.48 kJ/mol appeared. There was a synergistic interaction during the co-combustion process, and compared with other mixed rice husk hydrochar ratios, the co-combustion effect of samples was better when the ratio was 50wt%. The research results provided a preliminary theoretical basis for co-combustion of municipal sludge and rice husk hydrochar.

Key words: Municipal sludge, hydrochar, Kinetics, co-combustion, reaction kinetic