| The gasification experiment was performed in a bench-scale membrane wall entrained-flow gasifier using dry-feed method. The oxygen, diesel and ash slag were using in the gasification process. The temperature distribution and deposition morphology of slag were analyzed in baking and slagging processes. The morphology and physicochemical characteristics of nature-cooling slag at different gasification temperatures were studied by ImageJ, XRD, XRF and SEM-EDS. It was studied that the slag morphology with different sizes was distinct. The aspect ratio A fitted exponential relationship with the increasing gasification temperature. The density, porosity, mass distribution, combustible matter content, mineral substance and surface element composition of slag were influenced by gain sizes and temperatures.A mathematic model of three-dimensional heat transfer of membrane water wall was built. The model’s reliability was verified by the two parameters:temperature of fins and heat flux of cooling tube. The temperature and heat flux of membrane wall influenced by distribution density, welding angle and length of slag nail were analyzed. The high temperature and high heat flux area of water cooling tube was conformed, and the temperature field was analyzed at different temperatures and thicknesses of slag. The reliable evidence was provided for the design of membrane wall entrained-flow gasifier. |
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