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Study on the Characteristics of Slag and Fly Ash Which Generated from Entrained-bed Gasifiers

Author: LuShanShan
Tutor: GongXin
School: East China University of Science and Technology
Course: Chemical processes
Keywords: Gasification residue samples Combustible content Mineral composition Element distribution Adhesion properties
CLC: TQ541
Type: Master's thesis
Year: 2011
Downloads: 134
Quote: 0
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Abstract


In this paper, pulverized coal pressurized entrained flow gasification pilot device generates slag like Shell gasifier , Ningxia Coal GE waste heat boiler to generate the characteristics of the fly ash entrained flow gasification ash analysis for the study . Focusing on pulverized coal pressurized gasification pilot plant generate combustible content of the slag samples , the apparent morphology , particle size distribution , mineral composition , as well as the migration of elements in the slag -depth analysis of the effect of temperature on the impact of these factors . In addition, the adhesion behavior of fly ash conducted an exploratory study . Determination of content and particle size distribution of the combustible material in the slag , combustible matter content of the coarse slag and fine slag larger path different experiences with the coal particles in the gasifier related . The combustible content in the slag in the oxygen-coal ratio and coals and operating conditions are closely related. Oxygen-coal ratio is higher , the combustible matter content is lower , the greater the particle size of the particles . The content of the raw coal in some elements will be of combustible matter content and the particle size of the slag samples greater impact . Morphology of SEM, XRD, XRF, ICP-AES analysis by means of the raw coal and residue samples and slag mineral composition as well as major elements , trace elements were analyzed . The temperature had a greater influence on these factors : the higher the temperature , the surface of the slag samples more dense crystalline form of the mineral residue will change . The temperature on the migration of the elements , especially the migration and enrichment of trace elements have a greater impact , trace elements tend to be enriched in the low-temperature slag samples . Fact-Sage thermodynamic software migration process elements of the gasification process simulation , and compared with the actual results of the analysis . Provide the basis for further understanding of the behavior of trace elements . Design Determination of the experimental apparatus of the adhesive properties of the fly ash particles , and found that the temperature also has a great influence on the adhesive properties of fly ash , at a certain temperature , the adhesion of the particles will be greatly increased . Fly ash addition to the adhesion properties of the material has also caused some corrosion of materials .

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CLC: > Industrial Technology > Chemical Industry > Coal gasification industry > Gasification theory ( combustible gas,gas )
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