电锅炉辅助空气源热泵干式车库发酵加温系统

Electric Boiler-auxiliary Air Source Heat Pump Garage Dry Fermentation Heating System

干式发酵加温系统中存在着无法根据变工况提供相应的加温方式的问题,为此,针对200 m3的车库式干式发酵池,根据不同的天气状况切换空气源热泵单独加温模式与电锅炉-空气源热泵联合加温模式[1],以满足沼气池内的加温需求。还针对最不利工况条件下空气源热泵可能存在的结霜问题,提出相应的除霜方案,保障空气源热泵在最不利工况下的正常运行。实验采取的干式发酵池内设计温度为35℃,原料体积占发酵池的73%,原料中固体占30%,水占70%,发酵池尺寸为12.5 m×4 m×4 m,通过计算得到需要加热盘管总长度为125 m。

Dry fermentation heating system can＇t change the corresponding heating ways according to the variational working conditions. Therefore, a 200m3 garage dry fermentation pool with the electric boiler- auxiliary air source heat pump heating system is selected, it can switch the separate air source heat pump heating mode and electric boiler-air source heat pump heating mode [1] according to the different weather conditions, satisfying the heating demand of the pool. Aiming at the possible frost problem, the defrosting scheme is presented, which ensures the normal operation of air source heat pump under the most unfavor- able conditions. The dry fermentation pool design temperature in this experiment is 35℃, raw materials ac- count for 73% of the fermentation pool size. Solid accounts for 30% of the raw material, and water accounts for 70%. The fermentation pool size is 12.5m × 4m × 4m. By computing, it needs total 125m length heating coils.