Influence of O2/CO2 combustion on interaction of Ca and Fe in Shenhua coal

doi:10.11949/j.issn.0438-1157.20141162

CIESC Journal ›› 2015, Vol. 66 ›› Issue (2): 753-758.DOI: 10.11949/j.issn.0438-1157.20141162

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Influence of O₂/CO₂ combustion on interaction of Ca and Fe in Shenhua coal

WU Le¹, WU Jianqun², YU Dunxi², YAO Hong², XU Minghou²

1 Electric Power Research Institute of Guangdong Grid Corporation, Guangzhou 510080, Guangdong, China;
2 State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China

Received:2014-08-01 Revised:2014-10-07 Online:2015-02-05 Published:2015-02-05
Supported by:
supported by the National Natural Science Foundation of China(51376071), the National Basic Research Program of China (2013CB228501) and Specialized Research Fund for the Doctoral Program of Higher Education (20110142110075).

O₂/CO₂燃烧对神华煤Ca和Fe交互反应影响

吴乐¹, 吴建群², 于敦喜², 姚洪², 徐明厚²

1 广东电网公司电力科学研究院, 广东广州 510080;
2 华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074

通讯作者: 于敦喜
基金资助:
国家自然科学基金项目(51376071);国家重点基础研究发展计划项目(2013CB228501);高等学校博士学科点专项科研基金资助课题(20110142110075)。

Abstract

Abstract:

Shenhua coal, with high concentration of Ca and Fe, was subjected to combustion in the drop tube furnace (DTF) in both air and O₂/CO₂ atmosphere. XRF, XRD and CCSEM were used to characterize elemental composition, mineralogy and element symbiotic properties of bulk ash. Oxy-fuel combustion promoted interaction of Fe and Ca with other minerals. However, the amount of Fe distributed in iron aluminosilicate (Fe-alsil), especially in Fe+Ca minerals increased. The same distribution tendency of Ca was observed. Further analysis found that Fe+Ca mineral in oxy-fuel combustion bulk ash had more serious slagging propensity (with Fe₂O₃/CaO mole ratios 0.5—3) than that in air combustion bulk ash.

Key words: fuel, coal combustion, interaction, CCSEM, CO₂

摘要：

选用高Ca、高Fe含量的神华煤,在沉降炉系统中进行空气以及O₂/CO₂燃烧实验。利用X射线荧光探针(XRF)、X射线衍射仪(XRD)、先进计算机控制扫描电镜(CCSEM)分别对总灰元素、晶相组成以及主要矿物元素的共生特性进行深入表征。结果表明氧/燃料燃烧促进了Fe、Ca与其他矿物元素的交互反应,总灰中Fe在Fe-rich类矿物分布减少,而在铁铝硅酸盐(Fe-alsil),尤其是在Fe与Ca发生交互反应的Fe+Ca类矿物的分布增加,同时Ca也存在类似的分布规律。对总灰中Fe+Ca类矿物深入分析发现,氧/燃料燃烧条件下总灰中Fe+Ca类矿物结渣倾向更严重(Fe₂O₃/CaO摩尔比为0.5～3)。

关键词: 燃料, 煤燃烧, 交互反应, CCSEM, CO₂

CLC Number:

TK124

WU Le, WU Jianqun, YU Dunxi, YAO Hong, XU Minghou. Influence of O₂/CO₂ combustion on interaction of Ca and Fe in Shenhua coal[J]. CIESC Journal, 2015, 66(2): 753-758.

吴乐, 吴建群, 于敦喜, 姚洪, 徐明厚. O₂/CO₂燃烧对神华煤Ca和Fe交互反应影响[J]. 化工学报, 2015, 66(2): 753-758.

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Influence of O₂/CO₂ combustion on interaction of Ca and Fe in Shenhua coal

O₂/CO₂燃烧对神华煤Ca和Fe交互反应影响

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