Effects of CO2/H2O on the characteristics of chars prepared in CO2/H2O/N-2 atmospheres

Qing Mengxia; Su Sheng; Gao Jian; Sun Zhijun; Xu Kai; Xu Jun; Hu Song; Wang Yi; Xiang Jun

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Effects of CO2/H2O on the characteristics of chars prepared in CO2/H2O/N-2 atmospheres

机译：CO2 / H2O对CO2 / H2O / N-2大气中制备的CASs特性的影响

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CO2 and H2O play vital roles in the evolution of char structures and reactivities, particularly in wet oxy-fuel combustion. This work aims to investigate the effects of CO2/H2O gasification on the characteristics of char prepared in CO2/H2O/N-2 atmospheres. Lignite samples from Zhundong coalfield in China were pyrolyzed and gasified in different atmospheres at a slow heating rate of 20 degrees C/min to generate char. Raman spectroscopy was used to identify the microstructure of coal chars, which was correlated with the char combustion reactivity measured with thermogravimetric analyzer in O-2/H2O/CO2 atmosphere. The combustion reactivity index Tinder was correlated with Raman structural parameters to demonstrate the applicability of Raman spectroscopy in evaluating char-combustion reactivity. Results indicated that the gasification of CO2 and H2O with coal significantly contributed to the weight loss of char. The Raman band ratio I(Gr+V1+Vr)/I-D decreased and the total Raman peak area increased upon adding CO2 and H2O. Thus, the char became more condensed and contained additional O-containing functional groups. Char-combustion reactivity in oxy-fuel combustion was decreased which originated from the changes in char structures induced by CO2 and H2O gasification. Moreover, T-index had positive and negative linear correlations with the Raman parameters I(Gr+V1+Vr)/I-D and I-All, respectively. For char prepared in CO2-containing atmosphere, the correlation among T-index, I(Gr+V1+Vr)/I-D , and I-All can be expressed by the function T-index = 13.2299I((Gr+V1+Vr))/I-D - 1.7255E-4I(All) + 421.260 with R = 0.94.

机译：CO2和H2O在Char结构和反应的演变中起到重要作用，特别是在湿氧燃料燃烧中。该工作旨在探讨CO2 / H2O气化对CO 2 / H 2 O / N-2大气中制备的炭特性的影响。来自中国的迅速煤田的褐煤样品在不同的环境中以20度C / min的缓慢加热速度热解和气化，以产生炭。使用拉曼光谱法鉴定煤炭的微观结构，其与在O-2 / H 2 O / CO2气氛中的热重分析仪测量的炭燃烧反应性相关。燃烧反应性指数溶剂与拉曼结构参数相关，以证明拉曼光谱对炭燃烧反应性的适用性。结果表明，二氧化碳和H2O与煤的气化显着导致炭的减重。拉曼带比I（GR + V1 + VR）/ I-D降低，加入CO2和H2O时，拉曼总峰面积增加。因此，该炭变得更加浓缩并包含含有含O的官能团。氧燃料燃烧中的炭燃烧反应性降低，来自CO 2和H 2 O气化诱导的炭结构的变化。此外，T折射率分别与拉曼参数I（GR + V1 + VR）/ I-D和I-D分别具有正和负线性相关性。对于在含二氧化碳的大气中制备的炭，T折射率，I（GR + V1 + VR）/ ID和I-All之间的相关性可以由函数T-Index = 13.2299i表示（（gr + v1 + vr ））/ ID - 1.7255E-4I（全部）+ 421.260，R = 0.94。

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来源
《Fuel Processing Technology》 |2018年第2018期|共8页
作者
Qing Mengxia; Su Sheng; Gao Jian; Sun Zhijun; Xu Kai; Xu Jun; Hu Song; Wang Yi; Xiang Jun;
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作者单位

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

Huazhong Univ Sci &

Technol Sch Energy &

Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类燃料化学工业（总论）;
关键词
Char structure; Raman spectrum; Oxy-fuel combustion; Char reactivity;

机译：炭结构;拉曼光谱;氧燃料燃烧;炭反应性;

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1. Effects of CO2/H2O on the characteristics of chars prepared in CO2/H2O/N-2 atmospheres [J] . Qing Mengxia, Su Sheng, Gao Jian, Fuel Processing Technology . 2018,第期

机译：CO2 / H2O对CO2 / H2O / N-2大气中制备的CASs特性的影响
2. Effects of CO2 and heating rate on the characteristics of chars prepared in CO2 and N-2 atmospheres [J] . Su Sheng, Song Yao, Wang Yi, Fuel . 2015,第feba15期

机译：CO2和加热速率对在CO2和N-2气氛中制备的焦炭特性的影响
3. Combustion characteristics of lignite char in a fluidized bed under O-2/N-2, O-2/CO2 and O-2/H2O atmospheres [J] . Li Lin, Duan Lunbo, Tong Shuai, Fuel Processing Technology . 2019,第期

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Effects of CO2/H2O on the characteristics of chars prepared in CO2/H2O/N-2 atmospheres

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