混合原料在不同发酵工况下的产气规律研究  

Biogas production characteristics in the anaerobic fermentation process of mixed raw materials at different conditions

作　　者：黄小美[1,2] 刘晓赫 莫忠磊 文凯[1] 周阳[1] HUANG Xiaomei;LIU Xiaohe;MO Zhonglei;WEN Kai;ZHOU Yang(Key Laboratory of Eco-environments in Three Gorges Reservoir Region,Ministry of Education,Chongqing University,Chongqing 400045,China;National Centre for International Research of Low-carbon and Green Buildings,Chongqing University,Chongqing 400045,China;Hangzhou Academy of Urban Planning&Design,Hangzhou 310012,China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学低碳绿色建筑国际联合研究中心,重庆400045 [3]浙江省杭州市城乡建设规划设计研究院,浙江杭州310012

出　　处：《能源研究与信息》2018年第2期70-74,81,共6页Energy Research and Information

基　　金："十二五"国家科技支撑计划课题(2013BAJ11B05)

摘　　要：分别在五种不同条件下进行了沼气产气对比试验。试验条件分别为:干牛粪,温度为20℃,排气方式分别为持续排气、间歇排气(每天排气4次);干牛粪,温度为35℃,排气方式分别为持续排气、间歇排气;干牛粪与小麦秸秆按质量比1∶1配比的混合物,温度为35℃,排气方式为间歇排气。将原料装入100 L自动生物发酵罐中,并控制发酵温度和压力,检测发酵过程中沼气的日产气量、料液pH及产气中甲烷体积分数。结果发现,在间歇排气条件下,干牛粪与小麦秸秆混合物与相同质量的干牛粪相比总产气量提高约20%,但日产气量降低,产气周期延长近40%。相同质量的干牛粪,在35℃时发酵与在20℃时发酵相比总产气量提高约35%,高峰产气速度提高约1倍;持续排气相比于间歇排气,日产气量提高约1倍,但甲烷平均体积分数降低约10%。The comparative studies of biogas production were carried out at five different conditions,which included anaerobic fermentation of dry cow dung at 20℃with continuous exhausting or intermittently exhausting(4 times per day),anaerobic fermentation of dry cow at 35℃with continuous exhausting or intermittently exhausting,and anaerobic fermentation of dry cow and wheat straw at a ratio of 1∶1 at 35℃with intermittently exhausting.The prepared materials were filled into an automatic biological fermentation tank with the volume of 100 L.By changing the temperature and pressure in the tank,the PH value of feed liquid,the methane content and output of biogas were measured.The results indicated that the total biogas output of the mixed materials was about 20%,which was higher than that of the pure dry cow dung.But the daily biogas output of the mixed materials dropt and the production period of the mixed material increased nearly by 40%.Increasing the fermentation temperature from 20℃to 35℃resulted in the rising of the total biogas output by 35%.The peak rate of biogas output doubled.Comparing with intermittently exhausting,the daily biogas output by sostenuto exhausting doubled.The average methane content decreased by 10%.

关 键 词：小麦秸秆 沼气 厌氧发酵 产气量 甲烷 

分 类 号：TK6[动力工程及工程热物理—生物能]