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- Title
含钙和含铁矿物对粉煤气化堵渣的影响机理.
- Authors
李寒旭; 毛立睿; 陶 然; 胡 侠; 华桂义
- Abstract
In order to study the mechanism of slag blockage of pulverized coal gasification,the industrial slag samples (normal slag samples and unnormal slag samples) taken from coal gasification unit and the XZ coal ash slag samples (experimental slag samples) obtained from bench scale tube furnace in different temperature and reducing atmosphere were investigated. The ash chemical composition,crystal mineral composition,microscopic morphology and chemical composition of the micro-zone of slag samples were studied by X-ray Fluorescence (XRF),X-ray diffractometer (XRD) and Scanning Electronic Microscopy combined with energy Dispersive X-ray Spectrometer (SEMEDX) respectively. The results show that the main reasons of slag blockage of coal gasification is the formation of anorthite and iron precipation in slag samples. The iron precipation in slag under reducing atmosphere is caused by the formation Fe-O-S eutectic,which is converted by FeO,FeSx and FeS. The temperature fluctuations of gasifier operation is likely to lead to the formation of anorthite,and the massive formation of anorthite in slag is intrinsically linked to the enrichment of iron minerals and the precipitation of elemental iron.
- Subjects
PULVERIZED coal; COAL gasification; COAL ash; NATIVE element minerals; X-ray fluorescence; X-ray spectrometers; GAS furnaces; SMELTING furnaces
- Publication
Clean Coal Technology, 2019, Vol 25, Issue 1, p103
- ISSN
1006-6772
- Publication type
Article
- DOI
10.13226/j.issn.1006-6772.18121210