发电技术 ›› 2022, Vol. 43 ›› Issue (6): 908-917.DOI: 10.12096/j.2096-4528.pgt.22088

• 发电及环境保护 • 上一篇    下一篇

掺烧氨燃料对煤挥发分火焰特性及颗粒物生成的影响

朱京冀1, 徐义书1, 徐静颖1, 王华坤1, 刘小伟1, 于敦喜1, 马晶晶2, 徐明厚1   

  1. 1.煤燃烧国家重点实验室(华中科技大学), 湖北省 武汉市 430074
    2.省部共建煤炭高效利用与绿色化工国家重点实验室(宁夏大学), 宁夏回族自治区 银川市 750021
  • 收稿日期:2022-04-27 出版日期:2022-12-31 发布日期:2023-01-03
  • 作者简介:朱京冀(1998),女,硕士研究生,研究方向为氨煤混烧碳烟的生成机理,15901088535@163.com
    徐义书(1989),男,博士,讲师,研究方向为燃烧源PM2.5、碳烟的生成机理与生成控制、发动机清洁高效燃烧、新型替代燃料,本文通信作者,xuyishu@hust.edu.cn
    徐静颖(1991),女,博士,讲师,研究方向为燃烧有机污染物控制、太阳能热利用等,xujy2019@hust.edu.cn
    王华坤(1998),男,硕士研究生,研究方向为氨煤混燃烧与污染物,1418467324@qq.com
    刘小伟(1981),男,博士,教授,研究方向为PM2.5与重金属生成与联合控制、PM2.5在线检测、新型氧/燃料燃烧技术,xwliu@hust.edu.cn
    于敦喜(1975),男,博士,教授,研究方向为高效燃烧理论与技术、燃烧颗粒物,yudunxi@hust.edu.cn
    马晶晶(1983),女,博士,讲师,研究方向为能源利用过程污染物释放机理与控制,majingjing@nxu.edu.cn
    徐明厚(1966),男,博士,教授,研究方向为能源清洁利用、洁净煤燃烧、煤的燃烧理论,mhxu@hust.edu.cn
  • 基金资助:
    国家自然科学基金项目(51806075)

Effect of Co-firing Ammonia on Coal Volatile Flame Characteristics and Particulate Matter Formation Behaviours

Jingji ZHU1, Yishu XU1, Jingying XU1, Huakun WANG1, Xiaowei LIU1, Dunxi YU1, Jingjing MA2, Minghou XU1   

  1. 1.State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
    2.State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Univeristy, Yinchuan 750021, Ningxia Hui Autonomous Region, China
  • Received:2022-04-27 Published:2022-12-31 Online:2023-01-03
  • Supported by:
    National Natural Science Foundation of China(51806075)

摘要:

掺烧“零碳、富氢、高氮”的氨气(NH3)燃料是实现燃煤电站CO2减排的重要技术路径。为探究氨燃料的引入对煤燃烧及污染物生成行为的影响,基于McKenna平面火焰燃烧系统开展了煤掺氨燃烧实验,结合可见光相机、烟气分析仪及热泳探针取样分析系统,探究了掺烧氨燃料对煤挥发分火焰形态与温度特征、气态污染物及碳烟等细颗粒物生成的影响。研究结果表明:氨燃料先于煤着火,并加热促进煤热解及挥发分的生成与释放,促使挥发分着火燃烧,导致挥发分火焰长度和温度增加。掺烧的NH3在挥发分火焰中部分转化为NO,导致火焰中NO浓度显著升高。掺烧NH3提升了气相燃料当量比,促进了挥发分向碳烟的转化,促使碳烟颗粒生成量增加。

关键词: 燃煤电厂, 碳排放, 氨燃料, 挥发分火焰, 颗粒物, 碳烟

Abstract:

Co-firing “zero-carbon, hydrogen rich, high nitrogen” ammonia (NH3) fuel in coal-fired power plant is an important technical route to mitigate CO2 emission. To explore the impacts of co-firing ammonia fuel on coal combustion and pollutant formation behaviour, the coal-ammonia co-firing experiments were carried out on a McKenna type flat-flame burner system. Combined with visible-light camera, flue gas analyser and thermophoresis probe sampling system, the influence of co-firing ammonia on the flame properties, gaseous pollutant and particulate matter formation was explored. The results show that the ammonia fuel ignites ahead of coal, and the additional heat released from ammonia combustion promotes the pyrolysis of coal and the release of volatile. Thereafter, it promotes the ignition and combustion of volatile, resulting in the increase of flame height and temperature. The added NH3 is partially converted into NO in the volatile flame, resulting in a notable increase in NO concentration. Adding NH3 improves the equivalent ratio of gaseous fuel, which promotes the conversion of volatile to soot, and finally increases the yield of soot particles.

Key words: coal-fired power plant, carbon emission, ammonia fuel, volatile flame, particulate matter, soot

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