户用太阳能恒温沼气生产系统批式半连续发酵产气性能试验

EXPERIMENT ON GAS PRODUCTION PERFORMANCE OF FERMENTATION WITH BATCH AND SEMI-CONTINUOUS OF HOUSEHOLD THERMOSTATIC BIOGAS PRODUCTION SYSTEM HEATED BY SOLAR ENERGY

在甘肃省民勤县测试户用太阳能恒温沼气生产系统以半连续工艺发酵的产气性能。在当地冬季气象条件下,产气系统半连续补料厌氧发酵试验结果发现:该系统采用半连续补料发酵可在冬季最低环境温度为-18.2℃时连续稳定运行。在116 d试验期内,平均日产沼气0.95 m^3,累计产气110.71 m^3;当达到最低环境温度时,系统可实现在(27±2)℃的范围内的稳定产气;批式厌氧发酵过程半连续补料可维持较稳定的甲烷含量,平均甲烷含量为54.74%;另外,该产气系统在基质浓不变的度条件下可通过调节发酵温度,满足不同时期4~5口人家庭的生活燃气用量的需求。

Household thermostatic biogas production system heated by solar energy solves the problem of low gas production in the traditional biogas digesters in winter.However,there is no discussion about the continuous high efficiency of the batches of the batch fermentation in winter.The over-ground household energy thermostat biogas production system heated by solar energy was built in Zhangma village,Minqin county,Gansu province.The gas production performance of semi-continuous fermentation was studied under the actual operating conditions in winter.Under the meteorological conditions of Minqin,the semi-continuous fed-batch anaerobic fermentation experiment results show that the solar thermostatic biogas production system can continuously and stably run in winter,and can maintain high daily gas production for a long time,the average daily biogas production was 0.95 m^3 and the cumulative gas production was 110.71 m^3 during the whole experimental period.When the minimum temperature is-18.2℃,the system can still achieve constant temperature anaerobic fermentation in the range of(27±2)℃;Achieving the semi-continuous fed-batch in the batch anaerobic fermentation process can maintain the stable methane content for a long time,the cumulative production of methane is 60.6 m^3 and the average methane content is 54.74%during the 116 day testing period.The system can regulate the fermentation temperature to meet the gas demand of a family of 4-5 people in different periods during a year.