4.5 Article

Drying Biomass Using Waste Heat from Biomass Ash by Means of Heat Carrier

Journal

BIORESOURCES
Volume 17, Issue 3, Pages 5243-5254

Publisher

NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
DOI: 10.15376/biores.17.3.5243-5254

Keywords

Biomass drying; Heat carrier; Biomass ash; Waste heat utilization

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Agricultural and forestry biomass direct-fired power generation is an important technology for promoting low-carbon energy transition and sustainable development. Steel heat carriers were used to recover high-temperature ash waste heat and dewater and dry high moisture biomass. The optimization of waste heat recovery and mixed drying process resulted in reduced fuel moisture and improved thermal efficiency.
Agricultural and forestry biomass direct-fired power generation represents an important technology to promote low-carbon energy transition and sustainable development. To solve the problems of boiler output fluctuation caused by unstable combustion of high moisture content biomass and insufficient recovery of ash waste heat after combustion, steel heat carriers (HC) were used to absorb high-temperature ash (HTA) waste heat, and then HC was directly mixed with high moisture biomass for dewatering and drying. The thermal efficiency of waste heat recovery decreased with the increase of ash temperature, and the highest thermal efficiency of waste heat recovery was 77.4% at a heat-carrying spheres temperature (THC) of 600 ??C and a mixing mass ratio of 3. Through the optimization of waste heat recovery and mixed drying process, at a biomass ash temperature of 800??C, 1 kg of ash was able to dry 0.75 kg of high moisture content biomass, resulting in a reduction in fuel moisture by about 10%.

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