使用済みきのこ培地を利用する固定床ガス化熱利用技術の実証研究(<特集>RGB 三部会[リサイクル・ガス化・バイオマス]合同シンポジウム-廃棄物,バイオマス,石炭等利用技術の最新動向-)

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Small and middle scale biomass utilization has recently been emphasized to deal with limited amount of feasible biomass collection, variety of biomass feedstock and variety of ways of energy use. The aim of this work is to demonstrate steam production from spent mushroom substrates (SMS) with high concentration of ash and nitrogen. The demonstration plant employed a steam-drive conduction heating type drier, a flat-disk type pelletizer, a downdraft fixed-bed gasifier, a two-staged combustor and a once-through water-tube boiler. The generated steam was provided to the drier and the neighboring mushroom factory. Reducing NO_X emission and ash sintering were the key challenges of heat recovery from SMS because the concentrations of nitrogen and ash of widely used mushroom substrates are relatively higher than general wood chips. The NO_X concentration in the exhaust gas was approximately 250 ppm far below the regulated value of 350 ppm. Ash sintering was avoided by proper control of SMS consumption according to the producer gas yield.
2012-12-20