Investigation on the influence of sulfur and chlorine on the initial deposition/fouling characteristics of a high-alkali coal

被引：23
作者：
Yu, Shenghui [1 ]
Zhang, Cheng [1 ]
Yuan, Changle [1 ]
Xu, Hao [1 ]
Ma, Lun [1 ]
Fang, Qingyan [1 ]
Chen, Gang [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China
来源：
FUEL PROCESSING TECHNOLOGY | 2020年 / 198卷
基金：
中国国家自然科学基金;
关键词：
Zhundong coal; Initial fouling; Ash deposition; Layer structure; HIGH-TEMPERATURE CORROSION; UNDERSTANDING ASH DEPOSITION; ZHUNDONG COAL; GASIFICATION PERFORMANCE; BOILER STEELS; FLY-ASH; SODIUM; COMBUSTION; TRANSFORMATION; BEHAVIORS;
D O I：
10.1016/j.fuproc.2019.106234
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Sodium, calcium, sulfur and chlorine in the flue gas of coal-fired boilers are the main cause of ash deposition/fouling in heat exchangers. However, there are still many debates on the mechanism of ash deposition/fouling due to the lack of direct micro evidence. This paper aims to clarify the initial deposition/fouling characteristics of a high-alkali coal by computer-controlled scanning electron microscopy (CC-SEM). The results demonstrate that temperature has an influence on the deposition/fouling compounds. The crystalline compounds in the samples at 900 degrees C were mainly CaSO4 and Ca2Al2SiO2, while the compounds in the samples at 500 degrees C were mainly NaCl. Sulfur had a significant adsorption effect on sodium and calcium at 900 degrees C, while chlorine had a significant adsorption effect on sodium at 500 degrees C. A 3-layer microstructure of deposition/fouling was found after the samples were stripped by molecular force. Additionally, deposition/fouling could be divided into three stages: the formation of sodium salt precursors, the growth of loose structural aluminosilicates and the adhesion of particulates on the surface. Sulfates, especially Na2SO4 and CaSO4 formed a precursor for the initial deposition/fouling of high-alkali coal.
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页数：8
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