污泥微波热解过程中CaO,ZnCl_2和水蒸气对富氢气体生成特性的影响  

Effects of CaO,ZnCl_2 and Water Vapor on Hydrogen Rich Gas Formation During Microwave Pyrolysis of Sewage Sludge

作　　者：邓文义[1] 于伟超[1] 苏亚欣[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《东华大学学报（自然科学版）》2014年第5期624-632,共9页Journal of Donghua University(Natural Science)

基　　金：上海自然科学基金资助项目(11ZR1400700);中央高校基本科研业务费专项资金资助项目(13D111315)

摘　　要：在单模微波反应炉中进行了污泥高温微波裂解试验，考察了CaO，ZnCl2和水蒸气对H2，CH4，CO2和CO污泥热解气组分的影响规律及影响机理．研究结果表明，在800～950℃高温条件下，引入CaO或者ZnCl2均能促进热解气中H2体积分数的提升．当CaO和DS（干基污泥）质量比从0增至1：4时，H2的体积分数从34％提升至39．5％，然而，进一步提高CaO和DS的质量比对H2体积分数的影响并不显著．ZnCl2的效果较CaO更为显著，当ZnCl2和DS质量比从0增至1：2时，H2的体积分数从34％提升至47．5％．高温微波热解过程中引入水蒸气有利于富氢气体的生成，在800～950℃条件下，引入0．69g／min的水蒸气时，H2体积分数达到50％，提高了49．2％．研究还表明，CaO或ZnCl2与水蒸气进行联合催化气化时，在促进富氢气体生成方面优于催化剂或水蒸气单独作用下的效果．Microwave pyrolysis of sewage sludge was conducted in a single-mode microwave reactor. The effect rule and mechanism of CaO, ZnCl2 and water vapor on distribution of pyrolysis gas, such as H2, CH4 ,CO2 and CO were studied. The results indicated that, both CaO and ZnCl2 can effectively improve the formation of hydrogen rich gas at the temperature of 800-950 ℃. Increasing the mass ratio of CaO and DS （dried sludge） from 0 to 1 ： 4, the H2 concentration increased from 34% to 39. 5%. However, further increasing the mass ratio of CaO and DS value did not result in obvious H2 increasing. ZnCl2 was more effective than CaO in promoting the H2 concentration. Increasing the mass ratio of ZnCI2 and DS from 0 to 1 ： 2, the H2 concentration increased from 34% to 47.5%. The results indicated that the water vapor can markedly improve H2 formation during high temperature microwave pyrolysis of DS. At the pyrolysis temperature of 800-950 ℃with water vapor flow rate of 0. 69 g/min, the H2 concentration reached 50%, which was 49.2% higher than the condition of zero water vapor flow rate. It was found that, compared with CaO/ZnCl2 catalyzing or water vapor gasification alone, CaO/ZnCl2 catalyzing combined with water vapor gasification was much more favorable for H2 formation.

关 键 词：微波 污泥 催化 热解 氢气 

分 类 号：X705[环境科学与工程—环境工程]