地源热泵式中、高温厌氧发酵加温系统比选分析

目的]筛选沼气工程发酵系统。方法]比较70 m3/d日产气量的中型沼气工程用的地源热泵式中温厌氧发酵加温系统(池容产气率1 m3/(m3.d))和地源热泵式高温厌氧发酵加温系统(池容产气率2.2 m3/(m3.d))2种加温方案,计算其沼气池理论加温负荷、系统初投资以及运行费用,并分析了2者的技术可行性和经济效益。结果]高温厌氧发酵系统的初投资比中温厌氧发酵系统少8.3万元,年运行费用少2 711元,投资效益净现值为123 333元。结论]分析表明在加温系统的生命周期内,高温厌氧发酵系统具有更好的投资效益。

Comparison and Selection Analysis of Heating System of Mesophilic and Thermophilic Anaerobic Fermentation by Ground-source Heat Pump

Objective ] To screen biogas project fermentation system. Method ] Heating system of mesophilic （biogas productivity at 1 m3/（m3 · d） and thermophilic （biogas productivity at 2.2 m3/（m3· d） anaerobic fermentation by ground- source heat pump were compared, based on 70 m3/d daily biogas production of medium - sized biogas projects. Theoretical heating load of fermentation tank,initial investment and operating costs were calculated, and the economic benefits and technical feasibility were analyzed. Result ] The initial investment of thermophilic fermentation is lower than that of mesophilic fermentation by 83 000 yuan and annual operating costs of the heat pump is lower than that of meso- philie fermentation by 2 711 yuan. Investment returns net present value of thermophilic anaerobic fermentation system is 123 333 yuan. Conclu- sion ] Thermophilie fermentation system has a better investment returns in the life cycle of the heating system.