顶点赋权图分析法在沼气工程系统中的应用研究

利用顶点赋权反馈图分析法分析江苏某猪场沼气系统工程的效益，并建立猪场排泄物无污染的仿真学模型。根据2011年江苏某猪场与年猪粪尿和沼气效益有关的顶点赋权反馈图对其中的权值进行量化，采用量化结果和农户液化气消耗情况及耕地面积，建立猪场排泄物无污染的仿真学模型。结果表明：2011年该系统中含有3条正反馈环（沼气能源效益正反馈环、施肥面积正反馈环和沼渣效益正反馈环）及2条负反馈环（沼气浪费负反馈环和沼肥浪费负反馈环）。建立了两套排泄物无污染的仿真学模型的调整方案：一是在平均存栏量（1 728头）不变的情况下与168户农户建立输气管道，供农户使用；二是按比例扩大规模至3 721头，并建立与周边所有361户农户的输气管道，进一步健全沼液灌溉渠，扩大沼液灌溉面积。

Application of vertex weighted causal loop diagram analysis approach in biogas engineering system

The benefit using biogas engineering system in a pig farm in Jiangsu Province was analyzed with vertex weighted causal loop diagram analysis approach after and a simulation model was established to solve the problem of pollution. According to the vertex weighted causal loop diagram analysis related to annual pig feces and biogas benefit of a pig farm in Jiangsu Province in 2011， the weightings related to the diagram were calculated. Using the results of weightings， the agricultural acreage and the liquefied gas consumption， the simulation model was established. The results showed that there were three positive feedback loops including the biogas benefit， fertilized area and benefit of biogas residues， and two negative feedback loops which were biogas waste and biogas manure waste in the system in 2011. The adjustment schemes of two simulation models were established to solve the problem of pollution: one was to build gas pipeline with 168 households if the amount of livestock （1 728） was not changed， the other one was to build gas pipeline with 361 households if the amount of livestock increased to 3 721.