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Show Combustion of Coal-Water Mixture in Test Furnace by Isao Koyama ' * Kunio Okiura Yoshitaka Takahashi * Introduction In the development of highly loaded coal-water mixture (CWM), the number of study groups and the fields of research items are rapidly increasing in Japan. Under these circumstances, Hitachi initially introduced the Co-AL slurry technology and successfully performed the combustion test in September, 1982. However, the combustion characteristics are largely influenced by the slurry properties so that further tests and studies including slurry preparation, production, transportation and storage became necessary for the completion of combustion technology. Therefore, further development is continued as an overall system with each facility of the slurry handling process. Regarding the combustion test, the multi-burner furnace of 40 x 10^ Btu/h heat input was firstly used to confirm the potential of the CWM application in utility boilers. And the single burner test of 2 x 10^ Btu/h is also conducted in order to study the combustion performance and characteristics when the conditions of fuel and operation are changed. This paper describes the test programs and results obtained up to date. Background CWM utilization has been highlighted recently among utility and industry users, and its immediate application is desired. Because not only the price of slurry fuel but also the alternative safety fuel is important and sought by users according to circumstances where there may be a possibility of an accident in the nuclear plant and/or the natural gas fired power plant. Another aspect of the CWM application in utility boilers is the economic supply of low-calory, high-ash content coals produced in domestic mines. Today and in the future, the effective usage of these coals is a significant problem while most of the coal for utility and industrial boilers is imported to Japan. Therefore, many projects for studying the gasification, liquefaction and fluidized bed combustion etc. are made by the national organization with manufacturers and electric power companies for the purpose of the above. It is hoped that CWM will be applied to this aspect as rescue technology when a deashing system can be easily combined in the near future. * Kure works, Babcock-Hitachi K.K. ** Kure Research Laboratory, Babcock-Hitachi K.K. 1 |
