生物质发酵余热回收系统优化设计与性能分析

In order to solve the problem that the waste heat generated by biomass aerobic fermentation is difficult to be effectively recovered, with corn straw as the main raw material and using heat exchange method, a 100 L scale fermentation device and heat recovery system were built to recover the apparent heat and latent heat in the compost steam. The electric heating method is used to simulate aerobic fermentation heat production. The waste heat recovery process was optimized from the aspects of fluid flow, equipment insulation, water storage and heat transfer area. The heat production and heat recovery effect of the optimized system were tested. The results indicate that fluid flow rate, water tank insulation, and storage capacity have a significant impact on the heat recovery performance of the system. In the simulated heat production mode, the tank temperature can rise from 17℃ to more than 40℃ . Finally, through the intermittent heat recovery method, the balanced heat recovery efficiency of the system reaches more than 57%, and the average heat recovery power reaches more than 274 kJ/h, realizing the efficient recovery of fermentation waste heat.