Development of Pulverized Coal Combustion Technology for Fuel Diversification and High Turn Down Capability

There are some trial project that replace pulverized coal with bio-char to target the pulverized coal power plant. These will have to solve a lot of issues. However, an electric energy demand is expected to increase more and more in the future by sustainable energy resources. We developed the solid biomass fuel (hereinafter refer to as Bio-coke:BIC) and studies to use as a replacement for coal coke advance. But, BIC has a few demerit. One of them is that the calorific value for unit quantity decrease because it contains a lot of free water and volatile matters. Torrefaction processing is one of the way how to improve the energy efficiency. In this study, we produced BIC from green tea and improved fixed carbon content ratio by torrefaction processing. And we execute thermal analysis and the combustion experiment using torrefied BIC (hereinafter refer to as T-BIC). The purpose of the use in a pulverized coal power plant, the sample crushed it beforehand. Results are found in the following. (1) In the case of volatile matter content ratio less than about 45 %, as volatile matter content ratio is high, gasification time for unit quantity increase. In the case of volatile matter content ratio more than about 45 %, gasification time for unit quantity close to constant. (2) In the case of fixed carbon content ratio in more than about 50 %, as fixed carbon content ratio is high, char combustion time for unit quantity decrease. In the case of fixed carbon content ratio in less than about 50 %, char combustion time for unit quantity close to constant.

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粉体バイオコークスの燃焼特性に及ぼすトレファクション処理の影響

Tagami

Nor

Nakadate

et al. 2016

Journal of Smart Processing

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Development of Pulverized Coal Combustion Technology for Fuel Diversification and High Turn Down Capability

Abstract: Fig.1 Schematics of a pulverized coal-fired power plant.

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粉体バイオコークスの燃焼特性に及ぼすトレファクション処理の影響

粉体バイオコークスの燃焼特性に及ぼすトレファクション処理の影響

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