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为实现沼气工程运行的净产能最大化,以万头猪场配置的500m3发酵罐为分析对象,建立计算模型,计算净沼气产量,从而确定发酵温度。结果表明:发酵罐的能量产出效率指标k和能量输入效率指标η是发酵温度选择的决定性因素;在现有设计条件(k=0.55、η=0.45、发酵温度35℃)下运行,年增温所需沼气量为总沼气产量的42.4%,其中,冬季为65.2%,春季为42.1%,秋季为40.4%,夏季为22.3%,年平均净沼气产量为285.6m3/d;只有当k≥0.55和η≥0.45时,运行净能产出最大的发酵温度为35℃,当k或η值随工程运行下降,降低发酵运行温度方可获得最大净能产出;结合我国沼气工程的实际工况,建议选择30℃作为发酵运行温度,并及时对发酵设备进行维护,以确保工程的长期运行效率。
In order to maximize the net production capacity of the biogas project, a 500 m3 fermentor with 10,000 pig farms was selected as the analysis object to establish a calculation model and calculate the net biogas output so as to determine the fermentation temperature. The results showed that the energy yield efficiency index (k) and energy input efficiency index (η) of the fermenter were the decisive factors in the choice of fermentation temperature. The current design conditions (k = 0.55, η = 0.45, fermentation temperature 35 ℃) The amount of biogas required for temperature is 42.4% of the total biogas production, of which, 65.2% in winter, 42.1% in spring, 40.4% in autumn and 22.3% in summer, with annual average net biogas production of 285.6m3 / d; 0.55 and η≥0.45, the net fermentation temperature with the largest net output of operation was 35 ℃. When k or η decreased with the operation of the plant, the maximum net energy output could be obtained by lowering the fermentation operating temperature. Combining with the actual project of China’s biogas project Conditions, it is recommended to choose 30 ℃ as the fermentation operating temperature, and timely maintenance of the fermentation equipment to ensure the long-term efficiency of the project.