大中型沼气工程不同加热方式的经济效益分析

为解决大中型沼气工程的加热升温问题，该文以一个猪场废水处理沼气工程为例，对沼气锅炉、太阳能和沼气发电余热利用3种加热方式进行了经济效益分析。结果表明：沼气锅炉加热、太阳能加热和沼气发电余热利用加热3种方式的投资比为2︰11.2︰1，沼气发电余热利用加热方式的费用年值仅为沼气锅炉加热和太阳能加热方式的60%和12%；沼气发电余热利用加热方式无论从经济效益、技术性能，还是适应性、运行持久性等方面都明显优于太阳能加热和沼气锅炉加热。因此，基于中国的自然经济状况，大部分大中型沼气工程应优先选择沼气发电余热利用加热方式。

Economic benefit analysis on large and middle-scale biogas plants with different heating methods

To solve heating and warming problem on large and middle-scale biogas plants，taking a pig farm wastewater disposal biogas plant as an example, the economic benefits of three heating methods (biogas boiler, solar energy and biogas power generation waste heat utilization) were analyzed in this article. The results showed that ratio of investment was 2:11.2:1 to biogas boiler, solar energy and biogas power generation waste heat utilization, the annual cost of biogas power generation waste heating utilization method was only solar energy and gas boiler heating method’s 60% and 12%. Whether economic benefit, technical performance, or adaptability, persistence, biogas power generation waste heat utilization method were better than solar heating and gas boiler heating. Based on the natural and economical situation, the scheme of biogas power generation waste heat utilization is suitable for most large and middle-scale biogas plants in China.