Gasification combustion of wood pellets.

概要

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The purpose of this study is to use wood residue fuels for external combustion engine. An air-blown downdraft gasification combustion of wood pellets was carried out to avoid the several troubles caused by ashes. Gasification combustion to use in engine must be a high intensity and clean exhaust. A high intensity combustion can be achieved by making good use of the sensible heat of the produced gases. Experiments shows that the air ratio of gasification is in the range of 0.4-0.6 to perform high intensity combustion. In gasifier, if the operating temperature of the gasification reaction be over 900°C, ashes are melted and formed clinkers. The formation of the clinker may also be caused by the accumulation of the large quantities of chars on the grate. Promotion of char-gas reaction gives less char formation and a high intensity combustion. NOx emission depends on the oxygen concentration and the temperature in the combustor. Low NOx emission can be achieved by increasing the gasification temperature in gasifier and the quantity of heat exchange in combustor.
一般社団法人日本エネルギー学会の論文