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生物质化学工程 ›› 2019, Vol. 53 ›› Issue (1): 47-53.doi: 10.3969/j.issn.1673-5854.2019.01.007

• 研究报告 • 上一篇    下一篇

添加剂对秸秆成型燃料燃烧特性的影响

嵇顺,齐永锋*(),王妹婷,马如,葛攀乐   

  1. 扬州大学 水利与能源动力工程学院, 江苏 扬州 225127
  • 收稿日期:2017-10-16 出版日期:2019-01-30 发布日期:2019-03-15
  • 通讯作者: 齐永锋 E-mail:yfqi@yzu.edu.cn
  • 作者简介:嵇顺(1993—),男,江苏溧阳人,硕士生,研究方向为燃烧热物理及污染物控制
  • 基金资助:
    国家自然科学基金资助项目(51106133);江苏省科技支撑计划(社会发展)项目(BE2014682);扬州科技计划项目(YZ2016261)

Effect of Additives on Combustion Characteristics of Straw Briquette Fuel

Shun JI,Yongfeng QI*(),Meiting WANG,Ru MA,Panle GE   

  1. School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
  • Received:2017-10-16 Online:2019-01-30 Published:2019-03-15
  • Contact: Yongfeng QI E-mail:yfqi@yzu.edu.cn
  • Supported by:
    国家自然科学基金资助项目(51106133);江苏省科技支撑计划(社会发展)项目(BE2014682);扬州科技计划项目(YZ2016261)

摘要:

生物质成型燃料作为生物质能源的主要利用方式,优化其燃烧性能具有重要意义。在秸秆成型燃料中添加CaO、Ca(OH)2、SiO2、Al2O3、尿素、粉煤灰等常见添加剂,研究了其对SO2、NOx释放规律的影响。研究表明:提高钙硫比且降低含水量,能够降低SO2、NOx释放量。Al2O3的催化助燃作用增加了SO2、NOx的释放,粉煤灰与秸秆熔融烧结增强了异相脱硝。添加SiO2的成型燃料促进了钙硅酸盐复合物的生成,从而减少SO2的释放。通过分析不同SiO2添加量时的燃烧情况发现,添加量5%时,脱硫脱硝效果最好。在成型燃料燃烧15 s后添加尿素,尿素高温热解产生的还原性气体能够与SO2、NOx反应从而减少硫、氮氧化物的释放。温度升高促进熔融反应和异相脱硝反应,阻碍了焦炭中N的燃烧使NOx释放量大幅降低。

关键词: 生物质, 成型燃料, 添加剂, 脱硫脱硝, 烧结

Abstract:

It was meaningful to optimize the combustion performance of biomass briquette fuel, which was the main application of biomass energy. The effects of common additives such as CaO, Ca(OH)2, SiO2, Al2O3, urea and fly ash on the release of SO2 and NOx during straw briquette combustion were studied. The results showed that the release of SO2 and NOx was decreased with increasing calcium sulfur ratio and decreasing water content. The catalytic combusion of Al2O3 increased the release of SO2 and NOx, while the sintering of straw and fly ash enhanced the heterogeneous denitrification reaction. Adding SiO2 into briquette fuel was beneficial to the formation of calcium silicate complexes, which could reduce SO2. And the desulfurization and denitrification effects reached the maximum when the dosage of SiO2 was 5%. What was more, when urea was added after combustion for 15 s, the reducing gas produced by the pyrolysis of urea could decrease the release of SO2 and NOx. Moreover, the melting reaction and heterogeneous denitrification reaction were promoted by the increasing temperature, hindering the combustion of coke N, which greatly reduced the release of NOx.

Key words: biomass, briquette fuel, additives, desulfurization and denitrification, sintering

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