添加回热回质器的太阳能恒温沼气系统性能

Performance of solar thermostatic marsh gas system with additional heat and mass recycling implement

为了提高太阳能恒温沼气系统的太阳能利用率,给系统添加回热回质器,通过模拟新旧系统的换热过程,对新系统性能进行研究.根据兰州地区典型年最冷月气象资料计算的结果显示,新系统在30℃发酵条件下,回热回质器每天回热过程需要41min,可把进料系统中的水由5℃提升至17.5℃;添加回热回质器后系统每日能耗从229～259MJ降低到150～180MJ,回收热量2 436.2MJ,可节约太阳能集热器面积24.8m2,新系统能耗降低到原系统总能耗的67.7%.研究结果也适用于其他热源加热的恒温沼气系统.

In order to improve the utilization rate of the solar energy in the solar thermostatic marsh gas system,a heat and mass recycling implement was added into this system.The performance of this system was investigated through the simulation of heat exchanging process in the original and new system.It was shown by the result of calculation of based on the meteorological data of the coldest month in typical year in Lanzhou area that the heat and mass recycling implement would need 41 min every day for the recycle during fermentation process at 30 ℃ and could increase the temperature of the water in the feed system from 5 ℃ to 17.5 ℃.The energy consumption would be reduced from 220～260 MJ/d to 150～170 MJ/d and the heat recovery was 2 436.2 MJ,saving the area of the solar collector by 24.8 m2.Compared with that of original system,the total energy consumption of new system was reduced by 32.3%.The investigation result would be as well suitable for other heat sources in the thermostatic marsh gas system.