Research on agglomeration in a coal gasifier with twin fluidized beds
Conference
·
OSTI ID:324716
- Huazhong Univ. of Science and Technology, Wuhan, Hubei (China). National Lab. of Coal Combustion
- Wuhan Steel and Iron Corp., Hubei (China). Inst. of Steel and Iron
Coal gasification technology especially with fluidized beds is proven to be an effective procedure for high efficiency and clean use of coal. For producing middle heating value coal gas, a new coal gasifier system with twin fluidized beds has been developed in HUST (Huazhong University of Science and Technology). The fluidized bed has no serious problems such as slagging in PC boilers because of the low temperature. But coal ash produced in this gasifier system can cause agglomeration with bed materials and defluidization of gasifier. In this paper, optical microscope, X-ray diffraction (XRD), thermal analysis TGA/DTGA/DTA are carried out on the samples of agglomerates. The result indicated the mechanism of agglomeration and defluidization processing. Because of high alkali and alkaline earth elements and high sulfur content in coal, the molten alkali and alkaline earth sulfates, which are likely to form low-temperature eutectics, were formed on the char`s surface. The molten ash matrix on the char can transfer to the surface of bed particles, and caused them to form agglomerates and defluidization as the result of random collision between the bed particles coated with low-temperature compounds. Some discussions are put forward on how to prevent the gasifier from agglomeration and defluidization in this paper.
- OSTI ID:
- 324716
- Report Number(s):
- CONF-970931--
- Country of Publication:
- United States
- Language:
- English
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