纯活性炭粉末布袋脱汞的比较研究

Comparative research on removing mercury by powder activated carbon on bag filter

为解决布袋除尘器活性炭(AC)喷射脱汞传统技术中活性炭粉末利用率低、脱汞效率低的问题,提出了纯活性炭粉末-布袋脱汞新技术,采用纯活性炭粉末为吸附剂,进行了布袋脱汞实验研究,结果表明:纯活性炭粉末初次吸附的前85 min的平均脱汞效率为99.1%,脱汞效率大于75%的累计吸附时间为1 335 min.为便于比较,进行了活性炭粉末掺杂不同比例飞灰的脱汞实验,结果表明:纯飞灰在初次吸附的前85 min脱汞效率仅为19.3%,165 min时脱汞效率已经下降为0.活性炭粉末掺杂飞灰比例分别为0,20%,50%,80%,95%时,初次吸附的前85 min的平均脱汞效率分别为99.1%,95%,85.3%,79.7%,59.6%,每克活性炭脱汞效率大于75%的累计汞吸附量分别为196.1,172.5,133.8,123.6,21.7μg.可见,布袋-纯活性炭粉末脱汞新工艺具有良好的脱汞效率和活性炭利用率.

For improving mercury removal efficiency of activated carbon（AC） injection upstream a bag filter and the utilization ratio of powder activated carbon（PAC）, mercury removal experiments were conducted in a small-scale bag filter with pure PAC as the sorbent. The results indicate that the average mercury removal efficiency（AMRE） was 99.1% within 85 minutes for the first adsorption, and the adsorption time was 1335 minutes with removal efficiency above 75%. For comparison, other experiments were conducted using PAC mixed with different pro- portion of fly ash. The results show that the AMRE within 85 minutes for the first adsorption was only 19.3% and the removal efficiency fell to 0 after 165 minutes with fly ash as the sot- bent. The AMRE within 85 minutes for the first adsorption were 99.1~,95%, 85.3%, 79.7%, and 59.6%, and the mercury adsorption capacity with removal efficiency above 75% were 196.1 172.5, 133.8, 123.6, and 21.7 μg Hg/g AC for the PAC based sorbents mixed with the fly ash of 0, 20%, 50%, 80%, and95%, respectively. Hence, the mercury removal new technology by pure PAC on bag filter has better mercury removal efficiency and utilization ratio of PAC.