Transformation characteristics of sodium, chlorine and sulfur of Zhundong coal during O2/CO2 combustion in circulating fluidized bed

被引：39
作者：
Liu, Dianbin [1 ,2 ]
Li, Wei [1 ]
Li, Shiyuan [1 ,2 ]
Song, Wenhao [1 ,2 ]
Liu, Daofeng [1 ,2 ]
Kong, Runjuan [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
ENERGY | 2019年 / 185卷
基金：
中国国家自然科学基金;
关键词：
O-2/CO2; combustion; Circulating fluidized bed; High-sodium coal; Na/S/Cl transformation; ALKALINE-EARTH METALS; OXY-FUEL COMBUSTION; ASH DEPOSITION; RELEASE; LIGNITE; OPERATION; CORROSION; SULFATION; EMISSION;
D O I：
10.1016/j.energy.2019.07.043
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Transformation characteristics of sodium, sulfur and chlorine during the high-sodium Zhundong coal combustion were investigated by performing both air combustion and O-2/CO2 combustion experiments in a 50 kW circulating fluidized bed testing system. Via analyzing the chemical compositions and crystalline phases of ash samples, the following results were obtained. In comparison with air combustion, sodium release into gas phase was inhibited under O-2/CO2 combustion atmosphere at the identical oxygen concentrations. While increasing the inlet oxygen concentration under O-2/CO2 combustion could promote the release of sodium. Chlorine almost finished total release from the coal under all experimental conditions. Besides, sulfation reaction affected the transformation of sodium, sulfur and chlorine markedly, for it could alter the chemical form of sodium from chloride to sulfate and further influence the release and condensation process of sodium during the combustion process. In particular, elevating the inlet oxygen concentration could promote the sulfation reaction and reduce the content of chlorine in deposits significantly. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：254 / 261
页数：8
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