合成气
共晶体系
粉煤灰
煤
碱金属
氯
沉积(地质)
化学工程
矿物学
冶金
化学
材料科学
地质学
氢
复合材料
微观结构
工程类
古生物学
有机化学
沉积物
作者
Guangyu Li,Shisen Xu,Xuebin Zhao,Ruijin Sun,Chang‐An Wang,Lan Kang,Qisen Mao,Defu Che
出处
期刊:Energy
[Elsevier]
日期:2020-03-01
卷期号:194: 116901-116901
被引量:23
标识
DOI:10.1016/j.energy.2020.116901
摘要
The migration process of minerals and ash deposition in an entrained-flow coal gasifier with a capacity of 2000 t/d were investigated through twelve ash samples collected from various positions of gasification unit, including slagging, fly ash, filter cake, as well as ash deposits in the bottom layer, middle layer, core layer of the syngas convective cooler, respectively. The Na–Ca–Al–Si eutectics, KCl, and a large amount of FeS were clearly detected in the ash fouling samples. The occurrence modes of ash chemical element were also analyzed. Experimental results showed that sodium compounds tended to migrate from sodium chloride into aluminosilicate after the generation of chlorides, except potassium chloride. The low-melting eutectic, Na2O–SiO2–FeO with melting temperature below 800 °C, was determined in the ash deposit layers. The sticky magnetic spherical particles detected in the samples were distinguished into iron-oxygen-sulfur eutectics with high iron content and aluminosilicates associated with low iron content. With the combined effects of alkali metal reaction with chlorine/sulfur, low-melting eutectics, and magnetic spherical particles, the ash accumulation phenomenon appeared in the syngas cooler, which was dominated by the low-melting eutectics and magnetic substances. An effective operational measure strictly controlling the syngas temperature was applied to alleviate the ash deposition.
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