O2/CO2气氛下CO2和H2O气化反应对煤及煤焦燃烧特性的影响

雷鸣; 黄星智; 王春波

O₂/CO₂气氛下CO₂和H₂O气化反应对煤及煤焦燃烧特性的影响

华北电力大学能源动力与机械工程学院, 河北保定 071003

基金项目: 国家自然科学基金(51276064)和中央高校基本科研业务费专项资金(2014QN41)项目资助

详细信息

通讯作者:
雷鸣,E-mail:ncepu_lm@126.com

中图分类号: TK16
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出版历程
- 收稿日期: 2015-08-20
- 修回日期: 2015-09-29
- 刊出日期: 2015-12-30

Effect of CO₂ and H₂O gasification on the combustion characteristics of coal and char under O₂/CO₂atmosphere

School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China

Funds: The project was supported by National Natural Science Foundation of China (51276064) and the Fundamental Research Funds for the Central Universities (2014QN41).

摘要

摘要: 利用热天平对比研究了大同煤及煤焦在O₂/N₂、O₂/CO₂和O₂/H₂O/CO₂中的燃烧行为,探讨CO₂和H₂O气化反应对其富氧燃烧特性的影响。结果表明,在5%氧气浓度下,煤粉在O₂/N₂、O₂/CO₂和O₂/H₂O/CO₂中的燃烧速率按顺序依次降低。氧气浓度降低到2%,由于CO₂和H₂O气化反应的作用,煤粉在高温区的整体反应速率按顺序依次增大。当氧气浓度为5%时,煤焦在O₂/CO₂中的燃烧速率要低于O₂/N₂中的燃烧速率,但燃烧反应推迟后气化反应的参与使得煤焦在O₂/H₂O/CO₂中的整体反应速率显著升高。当氧气浓度降低到2%后,随着温度的升高,在CO₂气化反应的作用下,煤焦在O₂/CO₂中的整体反应速率逐渐高于O₂/N₂中的燃烧速率。在O₂/H₂O/CO₂中,由于H₂O在共气化中起主要作用,煤焦在O₂/H₂O/CO₂高温区的整体反应速率进一步升高。动力学分析表明,在5%氧浓度时,煤焦在O₂/N₂、O₂/CO₂和O₂/H₂O/CO₂中的表观活化能依次升高。随着氧气浓度的降低,在不同反应气氛中的表观活化能均有所下降。
- 富氧燃烧 /
- CO₂气化 /
- H₂O气化 /
- 燃烧特性 /
- 表观活化能
Abstract: The burning behaviors of Datong coal and char under O₂/N₂, O₂/CO₂ and O₂/H₂O/CO₂ atmosphere were comparatively investigated by thermogravimetric analyzer. The influence of CO₂ and H₂O gasification on the oxy-fuel combustion characteristics of coal and char were mainly studied. The results indicate that at 5% oxygen concentration the burning rate of pulverized coal in each atmosphere decreases in the order of O₂/N₂, O₂/CO₂ and O₂/H₂O/CO₂. When the oxygen concentration reduces to 2%, owing to the CO₂ and H₂O gasification, the overall reaction rate of pulverized coal increases in the same order at high temperatures. The burning rate of char is slower in O₂/CO₂ than that in O₂/N₂ at 5% oxygen concentration, but as the burning process is delayed, the overall reaction rate of char in O₂/H₂O/CO₂ rises significantly due to the action of gasification. At 2% oxygen concentration, the overall reaction rate of char in O₂/CO₂ is higher than the burning rate of char in O₂/N₂ with the rise in temperature. The overall reaction rate of char in O₂/H₂O/CO₂ further increases because the H₂O gasification plays a major role in CO₂ and H₂O co-gasification. The kinetic analysis shows that at 5% oxygen concentration the apparent activation energy in the atmosphere increases in the order of O₂/N₂, O₂/CO₂ and O₂/H₂O/CO₂. However, the apparent activation energy of different atmospheres declines with the decrease of oxygen concentration.
- oxy-fuel combustion /
- CO₂ gasification /
- H₂O gasification /
- combustion characteristics /
- apparent activation energy

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