混合原料在不同发酵工况下的产气规律研究
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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%.
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%.
引文
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[4]代元元,江皓,丁江涛,等.秸秆厌氧混合发酵的研究进展[J].中国沼气,2014,32(5):40-45.
[5]周宪龙,李强,黄涛,等.不同发酵原料对户用沼气产气量的影响[J].农学学报,2012,2(12):57-61.
[6]王晓娇,杨改河,冯永忠,等.牲畜粪便与秸秆混合的厌氧发酵效果及影响因素分析[J].农业环境科学学报,2011,30(12):2594-2601.
[7]OKUDOH V,TROIS C,WORKNEH T.The potential of cassava biomass as a feedstock for sustainable biogas production in South Africa[J].Journal of Energy and Power Engineering,2014,8(5):836-843.
[8]CHEN Y L,R??LER B,ZIELONKA S,et al.The pressure effects on two-phase anaerobic digestion[J].Applied Energy,2014,116:409-415.
[9]董飞青,李霞,卢剑波.发酵底物混合厌氧发酵的研究进展[J].应用生态学报,2012,23(7):2015-2025.
[10]李东,李连华,马隆龙,等.华南地区稻草的厌氧干发酵制取沼气研究[J].太阳能学报,2008,29(6):756-760.
[11]李文静,张彤,李伟,等.鸡粪与水稻秸秆混合厌氧发酵特性研究[J].西北农林科技大学学报:自然科学版,2011,39(1):137-143.
[12]覃国栋,刘荣厚,孙辰.Na OH预处理对水稻秸秆沼气发酵的影响[J].农业工程学报,2011,27(增刊1):59-63.
[13]宋籽霖,郭燕,杨改河,等.鸡粪与玉米秸秆混合发酵沼气产量影响因子研究[J].农业环境科学学报,2012,31(8):1624-1629.
[14]蒲贵兵,甄卫东,张记市,等.城市生活垃圾厌氧消化中甲烷产量的生物动力学研究[J].化学与生物工程,2007,24(7):55-59.
[15]周航,钟良才,和珍宝,等.加压下气泡在液体中的行为[C]//中国金属学会冶金反应工程学分会.第十七届(2013年)全国冶金反应工程学学术会议论文集(下册).太原:中国金属学会冶金反应工程学分会,2013:911-916.