旋转填充床分离沼气中的CO_2

以水为吸收液,采用旋转填充床分离微生物厌氧发酵沼气中的CO_2,考察了工艺条件对CO_2吸收效果的影响。实验结果表明:进液量越大、气液比越小、进口CO_2体积分数越小、操作压力越大、进液温度越低则CO_2的吸收效果越好,而床转速以适中为宜;在进液量60 L/h、气液比3.3、床转速1 000 r/min、进口CO_2体积分数40%、操作压力1.2 MPa、进液温度5℃的条件下,CO_2吸收率为57.4%,提纯后气体的CO_2体积分数为17%。

Separation of CO2 from biogas by rotating packed bed

CO₂ was separated from biogas in microbial anaerobic fermentation in a rotating packed bed using water as absorbent. The effects of process conditions on CO₂ absorption were investigated. The experimental results show that：The CO₂ absorption effect is increased with the rise of liquid inlet volume,the reduction of gas liquid ratio,the decrease of CO₂ volume fraction in biogas inlet,the rise of operation pressure,and the reduction of liquid inlet temperature,while the bed rotational rate should be appropriate;When the liquid inlet volume is 60 L/h,the gas liquid ratio is 3.3,the bed rotational rate is 1 000 r/min,the CO₂ volume fraction in biogas inlet is 40%,the operation pressure is 1.2 MPa and the liquid inlet temperature is 5 ℃,the absorption rate of CO₂ is 57.4%,and the volume fraction of CO₂ in gas outlet is 17%.