CIESC Journal ›› 2022, Vol. 73 ›› Issue (1): 384-392.DOI: 10.11949/0438-1157.20210849

• Energy and environmental engineering • Previous Articles     Next Articles

Kinetics investigation on iron-based oxygen carrier aided oxy-fuel combustion of anthracite char

Xu ZHAO1(),Changsheng BU1(),Xinye WANG1,Xin ZHANG2,Xiaolei CHENG2,Naiji WANG2,Guilin PIAO1   

  1. 1.School of Energy & Mechanical Engineering, Nanjing Normal University, Nanjing 210023, Jiangsu, China
    2.State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources, Beijing 100013, China
  • Received:2021-06-24 Revised:2021-10-11 Online:2022-01-18 Published:2022-01-05
  • Contact: Changsheng BU

铁基载氧体辅助无烟煤焦富氧燃烧动力学分析

赵旭1(),卜昌盛1(),王昕晔1,张鑫2,程晓磊2,王乃继2,朴桂林1   

  1. 1.南京师范大学能源与机械工程学院,江苏 南京 210023
    2.煤炭资源高效开采与洁净利用国家重点实验室,北京 100013
  • 通讯作者: 卜昌盛
  • 作者简介:赵旭(1996—),男,硕士研究生,1312954559@qq.com
  • 基金资助:
    国家自然科学基金项目(5217060627);江苏省重点研发计划项目(BE2019701)

Abstract:

Iron-based oxygen carrier aided oxy-fuel fluidized bed(FB) combustion replaces the traditional inert bed materials with oxygen carrier. The iron-based oxygen carrier expands the function of the “heat carrier” of the traditional bed material, and also assumes the role of the “oxygen carrier”, providing a new idea for adjusting the oxygen distribution in the furnace to match the coal combustion process. The combustion characteristics and kinetics of anthracite coal char and three types of iron-based oxygen carriers (pure Fe2O3, hematite, and steel slag) aided combustion of anthracite coal char were investigated in a thermogravimetric analyzer with the temperature range of 30℃ to 1100℃ at a heating of 10℃/min, 15℃/min and 20℃/min under a 10%O2/90%CO2 atmosphere. It is observed that the combustion behavior of anthracite coal char is much improved with the aid of the iron-based oxygen carriers, for instance, the combustion rate increases from 2.84%/min to 3.66%/min, 3.83%/min, 3.72%/min, the burnout temperature decreases from 878℃ to 803℃, 802℃, 810℃, and the comprehensive combustion index increases from 3×10-8 %2/(℃3?min2) to 6.39×10-8 %2/(℃3?min2), 6.21×10-8 %2/(℃3?min2), 6.08×10-8 %2/(℃3?min2) for pure Fe2O3, hematite and steel slag aided combustion, respectively. The results of kinetics analysis indicate that there is a compensation effect between the activation energy and the pre-exponential factor for the oxygen carriers aided combustion of anthracite coal char. Among three types of iron-based oxygen carriers, pure Fe2O3 is slightly better than hematite and steel slag in improving the combustion characteristics of anthracite coal char. Steel slag can be used as a bed material instead of quartz sand for iron-based oxygen carrier aided oxy-fuel fluidized bed combustion.

Key words: coal combustion, iron-based oxygen carrier, reaction kinetics, CO2 capture, thermogravimetric analysis

摘要:

流化床铁基载氧体辅助富氧燃烧下传统石英砂床料被铁基载氧体替代,铁基载氧体扩展了传统床料的“热载体”的功能,另承担了“氧载体”的角色,为调节炉内氧分布与煤燃烧过程匹配提供了新思路。本文在热重实验平台探究了10%O2/90%CO2气氛下分析纯Fe2O3、赤铁矿及钢渣三种铁基载氧体辅助无烟煤焦燃烧特性及动力学。结果表明,相较于纯无烟煤焦燃烧,铁基载氧体辅助燃烧下无烟煤焦的燃烧特性得到显著改善,其中燃烧速率提高29%以上,燃尽温度降低65℃以上,综合燃烧指数提升2倍以上,活化能与指前因子同步增加且表现出“补偿效应”。三种铁基载氧体中分析纯Fe2O3对无烟煤焦燃烧特性的改善略优于赤铁矿和钢渣,钢渣可作为流化床铁基载氧体辅助富氧燃烧的床料替代石英砂。

关键词: 煤燃烧, 铁基载氧体, 反应动力学, 二氧化碳捕集, 热重分析

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