PRELIMINARY CHARACTERISTIC OF COAL GASIFICATION BY-PRODUCT FROM PILOT PLANTS BASED ON FLUIDIZED BED REACTORS

摘要

Coal gasification technology in reactors with circulating fluidized bed is being developed as an alternative to gasification in entrained flow reactors. To the advantages of fluidized bed reactors can be include lower capital and operating costs as well as reliability, at a relatively low temperature of the process. Research and development in this field, are conducted also in Poland, in the framework of the project "Development of coal gasification technology for highly effective production of fuels and energy", which is funded by the National Research and Development Centre. Researches are based, inter alia, on two pilot plants built and / or upgraded by the Institute for Chemical Processing of Coal in Zabrze, Poland, and the Technical University of Czestochowa. In the first period of the pilot plants work, a few kinds of hard coal and lignite gasification by-products were produced, and the initial diagnosis of their properties is the subject of this paper. Two groups of materials have been the subject of analysis. The first one contains inter alia fly ash and bottom ash of granulation similar to fly and bottom ash produced in fluidized bed boilers. In the second installation by-product in the form of char is produced. It can not be considered as waste because of the significant content of unburned carbon. One of the possible directions of utilization is a thermal treatment such as combustion, in result which real waste could be produced.The conducted study included identification of the basic properties of the gasification by-products, including grain composition, chemical composition, leachability of chemical contaminants, as well as studies of the microstructure using SEM.