04/02020 Development and operation results of recycle fuel fired bubbling fluidized bed boiler: Yokoshiki, T. Kami Pa Gikyoshi, 2003, 57, (5), 633–644. (In Japanese)
- Publisher
- Elsevier Science
- Year
- 2004
- Weight
- 176 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0140-6701
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✦ Synopsis
11 Process heating, power and incineration (energy applications in industry) different gas concentrations along the riser (02, CO, CH4, etc.), and the carbon combustion efficiency. The experimental results of carbon combustion efficiencies were compared with those predicted by the model and a good correlation was found for all the conditions used.
04/02019 Co-combustion of municipal solid waste and Thai lignite in a fluidized bed Suksankraisorn, K. et al. Energy Conversion and Management, 2004, 45, (6), 947-962. Co-combustion of high moisture municipal solid waste (MSW) and high sulfur Thai lignite in a laboratory scale bubbling fluidized bed has been investigated. This paper presents the effects of the mass fraction of a model MSW in the fuel mixture, as against 100% lignite, on the combustion characteristics that may be inferred from temperature distributions, carbon combustion efficiency and CO and CO2 concentrations and on the emissions of major gaseous pollutants, including CO, SO2, NO and NzO. The influence of excess air and secondary air on those characteristics are also discussed. The results show that within the 40% MSW fraction tested, co-combustion is characterized by enhanced combustion of volatiles in the freeboard, a lower bed temperature and a combustion efficiency drop of up to 8%. Cocombustion either increases or reduces CO emission depending on the percentage of excess air. Reduction of up to %18% of SO2 is observed at the 40% MSW fraction for the range of excess air and secondary air tested. Both NO and N20 increase slightly with increasing fraction of MSW. Within the range of experimental conditions tested, the optimum condition for co-combustion in view of combustion efficiency and CO, NO and N20 emissions is: 20% MSW, 40% excess air and 0.2 secondary to total ratio, although the reduction of SO2 is slightly smaller than at other conditions.
04/02020 Development and operation results of recycle fuel fired bubbling fluidized bed boiler
Yokoshiki, T. Kami Pa Gikyoshi, 2003, 57, (5), 633-644. (In Japanese) Japan attained highly economic growth over the past decades. During this economic prosperity, the amount of waste has increased rapidly due to the mass production and mass consumption of various products. Nowadays, there is a tendency to utilize refuse as a fuel, to reduce the impact on environment such global warming and to save the use of fossil fuel. To meet the social needs, Mitsubishi Heavy Industries, Ltd., developed the M-STAR method under bubbling fluidized bed combustion. Combustion occurs at high temperature created by supplying multistage combustion air to the upper part of the bubbling fluidized bed in addition to primary air from the bottom. Due to such high-temperature combustion under a well-agitated mixed-gas atmosphere with a long residence time, combustion was achieved with low NOx, CO and dioxin emission. The M-STAR method was put to practical use on a paper sludge (refuse) and coal co-fired boiler and a wood chip (refuse) and coal co-fired boiler, and confirmed a much lower NOx, CO and dioxin level than the requests of purchaser. Further, Mitsubishi Heavy Industries, Ltd, continue with development and design of a worn-out tyre-firing fluidized bed boiler.