摘要
针对北方寒冷地区户用沼气池常温发酵产气率低的情况,在天津地区气象条件下,构建了1套户用太阳能-发电余热中温厌氧发酵热电联产系统,阐述了该系统的设计原理,并对沼气发酵的热负荷、发电机余热回收利用率、太阳能集热器面积等关键参数进行了理论计算.计算得出发电余热日均回收量为36.25,MJ,为满足中温发酵,11月、12月、1月、2月需要太阳能集热器额外补给热量,保证系统稳定运行.从1月份到3月份对系统进行连续运行测试,运行周期为60,d,发酵罐体积为10,m3,罐内料液从第6,d左右处于中温发酵水平,累计产气量166.5,m3,发电量146.4,k W·h,经调查满足农户基本生活用电需求.该文为北方寒冷地区户用沼气综合利用提供了参考.
Biogas projects have been rapidly developed in China due to their energy efficiency and environmental benefit. However the biogas production is declined because the thermal insulation in this region cannot support the biogas fermenta- tion. In this study, a set of heating system that is composed of solar and power waste energy is tested. This technology has been demonstrated for a middle temperature fermentation project in Tianjin city. Some key parameters including fermentation heat load, generator heat recoveryutilization rate, and areas of solar collector unit are calculated theoretically to verify whether this heating system can meet the middle temperature condition. The results show that averaged daily generator heat recovery is 36.25 M J, The biogas project needs additional power from the solar collectors in November, December, January and February to ensure the project stable operation. A continuous testing for the temperature rising effects by this heating system has been conducted from January to March. Fermenter volume is 10 m3, the tank liquid reaches the fermentation temperature level from the 6 days, the cumulative gas production 166.5 m3, generating capacity 146.4 kw · h. By investi- gation, the electricity meet farmer＇s basic needs of living. It is expected that this paper will assist designing a heating system to the household biogas projects in northern cold regions.
出处
《天津城建大学学报》
2015年第1期55-59,共5页
Journal of Tianjin Chengjian University
基金
国家星火计划(2013GA610005)
天津市科技计划项目(13ZCZDNC01400)
关键词
太阳能
发电余热
户用沼气工程
增温系统
solar energy
power waste heat
household biogas project
heating system
