基于层次分析法和熵权法的中小型沼气工程净化提纯技术筛选

Selection of purification technology for small and medium-sized biogas projects based on AHP and entropy weight method

文章构建了3层次13指标的沼气提纯技术综合评价体系,并运用层次分析法和熵权法从技术成熟度、产品气性能、设备适应性、环境指标和经济指标5个方面对13个指标进行了权重排序,得出最重要的3项指标分别为产品气纯度、甲烷回收率和对不同来源沼气的适应性,其权重分别为0.1796,0.1111和0.1054。在该评价体系的基础上,采用模糊综合评价法对5种常用沼气提纯技术进行适合中小型沼气工程提纯系统应用的排序,得出其顺序为膜分离法、变压吸附法、化学吸收法、物理吸收法、深冷分离法。层次分析法和熵权法的综合使用,减弱了层次分析法的主观性影响,避免了熵权法偏离实际生产的可能,为沼气提纯技术的筛选提供了一种科学的方法。

This paper built a comprehensive evaluation system of biogas purification technology with 3 levels and 13 indicators,the indexes were ranked in five aspects:Technology maturity,product gas performance,equipment adaptability,environmental index and economic index by using analytic hierarchy process and entropy weight method.The three most important indicators were product gas purity,methane recovery and adaptability to biogas from different sources,and the weights were 0.1796,0.1111,and 0.1054,respectively.On the basis of this evaluation system,the five comprehensive biogas purification technologies were sorted using fuzzy comprehensive evaluation method,and the sequence suitable for the application of small and medium-sized biogas engineering purification systems was:Membrane separation method,pressure swing adsorption method,chemical absorption method,physical absorption method,cryogenic separation method.The comprehensive use of AHP and entropy weight method reduced the subjective influence of AHP,avoided the possibility that entropy weight method deviated from actual production,and provided a scientific method for biogas purification technology screening.