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Method and facility for drying biomass fuel using residual heat from flue gas of power plant
Method and facility for drying biomass fuel using residual heat from flue gas of power plant
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机译:利用发电厂烟气余热干燥生物质燃料的方法和设备
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摘要
A method and an apparatus for using excess heat from power plant flue gas to dry biomass fuel. The method comprises the following steps: 1.) graduated use of excess heat from flue gas; 2.) first stage high-temperature rapid hot-air drying; 3.) second stage medium-temperature constant hot-air drying; 4.) third stage low-temperature accelerated drying. The apparatus comprises a multi-layered belt dryer (1) and a graduated heat-recovery and heat-exchange system for excess heat from flue gas. Horizontal partitions (1-2) partition conveyor belts (1-1) in a drying chamber of a dryer casing into a hermetically sealed high-temperature area (2), medium-temperature area (3), and low-temperature area (4), from top to bottom respectively. The front side of the high-temperature area (2) is provided with a high-temperature air inlet (5). The front side of the medium-temperature area (3) is provided with a medium-temperature air inlet (7). The front side of the low-temperature area (4) is provided with a low-temperature air inlet (9), A discharge chute (1-3) is provided between adjacent conveyor belts (1-1), such that the biomass fuel may be conveyed from upper layers to lower layers along a snakelike path. The method and device allows for the full utilization of excess heat from flue gas, thereby achieving the objectives of increasing drying efficiency, saving energy and reducing emissions.
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