大豆皂脚与玉米秸秆厌氧发酵沼渣共热解特性及应用
Co-pyrolysis characteristics and application of soybean soapstock and corn stalk anaerobic fermentation biogas residue
李雪光 1左晓宇 1代建军 1刘广青 1张瑞红1
作者信息
- 1. 北京化工大学 有机无机复合材料国家重点实验室,北京 100029
- 折叠
摘要
将大豆皂脚与玉米秸秆厌氧发酵沼渣两种固体废弃物以不同比例混合后进行共热解,采用元素分析、扫描电子显微镜(SEM)、N2吸附-脱附法(BET)对得到的共热解炭进行表征,并将共热解炭循环应用到玉米秸秆厌氧发酵环境中,考察共热解炭对厌氧发酵过程的影响.结果表明:共热解炭的产率随着沼渣加入量的增大而增大;沼渣加入量较少时,可以促进共热解气的生成,但对共热解液的产生有较弱的抑制作用;共热解炭的比表面积和平均孔径介于两种单一热解炭之间,并且平均孔径随沼渣加入量的增大呈减小趋势;将大豆皂脚与沼渣的质量比为4:3下制备的共热解炭加入厌氧发酵系统中,发酵30d时累积产气量达到390.80 mL/g,累积产甲烷量达到213 mL/g,累积产气量达到总产气量80%所需要的时间t80为(14±1)d,比不添加热解炭的空白组提前了12.5%.
Abstract
The co-pyrolysis of soybean soapstock and corn stalk anaerobic fermentation biogas residue in different proportions has been carried out.The obtained co-pyrolysis carbons were characterized by elemental analysis,scan-ning electron microscopy(SEM)and N2 adsorption-desorption measurements(BET).The effect of co-pyrolysis carbons on the anaerobic fermentation of corn stalk was investigated.The results showed that the yield of co-pyroly-sis carbon increased with the increase of biogas residue addition.When the amount of biogas residue was small,it could promote the formation of co-pyrolysis gas but had a weak inhibition effect on the generation of co-pyrolysis liq-uid.The specific surface area and average pore size of co-pyrolysis carbon were between those of two single pyroly-sis carbons and the average pore size decreased with the increase of biogas residue addition.The co-pyrolysis car-bon obtained with a mass ratio of soybean soapstock to biogas residue of 4:3 was added to the anaerobic fermenta-tion system.After 30 days of fermentation,the cumulative gas production reached 390.80 mL/g,and the cumula-tive methane production reached 213 mL/g.The time t80 required for the cumulative gas production to reach 80%of the total gas production was(14±1)d,which is 12.5%shorter than that for the blank group without pyrolysis carbon.
关键词
大豆皂脚/玉米秸秆厌氧发酵沼渣/共热解/厌氧发酵Key words
soybean soapstock/corn stalk anaerobic fermentation biogas residue/co-pyrolysis/anaerobic fermen-tation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据