The heat dissipating capacity of insulation layer with different materials and different thicknesses and the internal temperature field of biogas digester were numerically simulated by using the Fluent software based on the climatic conditions in Zhengzhou. The results showed that when the others conditions were the same, the heat dissipating capacity of concrete biogas digester was about 4.66 times of that of heat dissipation of foaming cement biogas digester, so the material with small coefficient of thermal conductivity can be chosen as the insulation layer; the thickness of the insulation layer had few influence on the heat dissipating capacity of biogas digester, so the thickness of insulation layer should be chosen according to actual conditions; the temperature field in the biogas digester distributed unevenly and can not reach the set temperature for biogas fermentation, so the digester needed to add the mixer to achieve the purpose of uniform mixing.%以郑州地区的气象条件为参数,使用Fluent软件对沼气池不同材料、不同厚度的保温层及沼气池内部温度场的数值进行了模拟研究.结果表明:其他条件一定时,混凝土沼气池的散热量约为发泡水泥沼气池的4.66倍,可选择导热系数小的材料作为保温层；保温层的厚度对沼气池的散热量影响不大,根据实际条件选择厚度；池内温度场的分布不均匀,没有达到沼气发酵设定的温度,因此需要增加搅拌器以达到混合均匀的目的.
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