不同种类畜禽粪污沼气产气量优化计算方法

Optimization Calculation Method of Biogas Production from Different Kinds of Livestock and Poultry Manure

近年来国家层面出台了多项鼓励和支持沼气工程发展的政策。在实际沼气工程项目设计过程中,沼气产气量计算的准确性尤为重要,关系到一系列主辅设备的选型及项目整体经济性。目前常用的几种沼气产气量计算方法存在一些不足之处,与实际工程项目存在一定偏差。针对实际工程中存在部分参数无法收集、部分推荐参数取值范围广导致计算误差放大、实际工程运行条件与理论计算存在差异等问题,提出了优化思路。同时,充分考虑了不同种类畜禽的单只生物粪污排放量、粪污含固率、固体物质产气率、产气速率、养殖方式、清粪工艺、清粪周期、发酵周期等因素产生的影响,并通过对厌氧发酵时长与产气量之间的关系、自然发酵时长与产气量之间的关系、养殖规模与粪污总固体含量之间的关系等进行分析后,提出优化后的沼气产气量计算模型。最后,利用实际工程数据对优化后的计算模型进行了校验,结果显示优化后的计算模型计算结果与实际工程非常接近,误差率较低,值得应用推广。

In recent years,the state has issued a number of policies to encourage and support the development of biogas projects.In the actual design process of biogas project,the accuracy of biogas production calculation is particularly important,which is related to the selection of a series of main and auxiliary equipment and the overall economy of the project.However,there are some deficiencies in several commonly used calculation methods of biogas production,and there is a certain deviation from the actual project.In view of the problems that some parameters cannot be collected in the actual project,the calculation error is enlarged due to the wide range of coefficient values,and there are differences between the actual project operation conditions and the theoretical calculation,the optimization idea is put forward.At the same time,the effects of single biological fecal sewage discharge,fecal sewage solid content,solid matter gas production rate,gas production rate,breeding mode,fecal cleaning process,fecal cleaning cycle,fermentation cycle and other factors of different kinds of livestock and poultry are fully considered.After analyzing the relationship between anaerobic fermentation duration and gas production,natural fermentation duration and gas production,and the relationship between breeding scale and total solid content of fecal sewage,the optimized calculation model of biogas production is put forward.Finally,the optimized calculation model is verified by using the actual engineering data.The results show that the calculation results of the optimized calculation model are very close to the actual engineering,and the error rate is low,which is worthy of application and popularization.