甘肃省大中型沼气集中供气系统碳足迹分析及过程优化研究

Process Optimization of Medium-and Large-scale Biogas Project Based on Carbon Footprint Analysis in Gansu Province

大中型沼气集中供气系统是现阶段甘肃省农村地区重点推广的民用生物质能开发系统,它具有显著的环境正外部性,可以通过为农村居民集中供应沼气替代煤炭、秸秆等传统炊事能源,有效减少温室气体和环境污染物的排放。但调研发现,甘肃省许多试点项目并没有充分发挥这种正外部性,尤其是碳减排效应十分有限,其内在原因值得探究。文章通过调研甘肃省9个大中型沼气集中供气系统试点项目,结合生命周期清单分析梳理出各系统各环节的碳排放足迹,找出存在的问题和可优化的环节,并结合替代效益分析,提出碳足迹优化的解决方案,以期能够为大中型沼气集中供气系统碳减排效应的充分发挥提供一些参考建议。

Medium-and Large-scale biogas project(MLBP)has significant positive environmental externalities,which can effectively reduce the emission of greenhouse gases and environmental pollutants by supplying biogas for rural residents instead of coal,straw and other traditional cooking energy.However,the investigation found that many pilot projects in Gansu Province did not give full play to this positive externality,especially,the carbon emission reduction effect was very limited,and the internal reasons are worth exploring.By investigating 9 typical pilot projects of MLBP in Gansu province,this paper analyzed and sorted out the carbon emission footprints of each link of the system based on the life cycle inventory,and found out the existing problems and the links that could be optimized.Combined with the alternative benefit analysis,the solution of carbon footprint optimization was proposed so that to provide some reference and suggestions for the full play of carbon emission reduction effect of MLBP.