铁盐浸渍强化污泥活性炭-甲醇热质传递特性  

Heat and mass transfer enhancement of sludge-based activated carbon and methanol working pair by in-situ impregnation of ferric-salt

作　　者：公绪金[1] 王君竹 郭子瑞 池日光 GONG Xu-jin;WANG Jun-zhu;GUO Zi-rui;CHI Ri-guang(School of Energy and Civil Engineering,Harbin University of Commerce,Harbin 150028,China)

机构地区：[1]哈尔滨商业大学能源与建筑工程学院,黑龙江哈尔滨150028

出　　处：《中国环境科学》2022年第11期5208-5219,共12页China Environmental Science

基　　金：哈尔滨商业大学青年学术骨干支持计划项目(2020CX06);国家自然科学基金资助项目(51708162)。

摘　　要：针对以市政污泥为核心的炭素前驱体开展原位铁盐浸渍磁修饰,通过响应曲面试验设计优化并制备了新型原位浸渍炭IM-WNC;以成品炭的后浸渍磁修饰炭PM-WNC为参比,考察了原位浸渍与后浸渍磁修饰过程对污泥活性炭-甲醇工质对的吸附/解吸速率、吸附等温线、吸附床传热性能、制冷量及制冷功率等方面的影响.结果表明:与后浸渍过程相比,原位铁盐浸渍有利于保持污泥炭总孔容积(0.6608cm^(3)/g)及比表面积(1122m^(2)/g)水平,能显著提升致密化污泥炭IM-WNC的导热系数(600kg/m^(3),4.586W/(m·K))、甲醇Sokoda&Suzuki平衡吸附量((528.74±15.86)mg/g)和Langmuir最大吸附量((673.99±13.52)mg/g).升温脱附与冷却吸附循环体系内,IM-WNC致密化吸附床中心温度峰谷差值可达到69.07℃.当循环时间为76min,解吸温度为100℃时,IM-WNC吸附制冷床的制冷量和制冷功率分别达到501.43kJ/kg和799.06kJ/(kg·h),较PM-WNC分别提升了15.61%和18.69%.A new exploring research on transformation and utilization of municipal biological sludge was conducted in the present work,based on the interdisciplinary researches focusing on municipal engineering and cryogenic refrigeration engineering.In the previous studies,adsorption/desorption capacities of sludge-based activated carbon-methanol working pair was effectively improved based on pore structure regulation.However,the simultaneous improvement of heat and mass transfer deficiencies was still a bottleneck problem affecting the energy efficiency of sludge carbon adsorption refrigeration.Studies on heat and mass transfer enhancement of sludge-based activated carbon and methanol working pair by magnetic modification(in-situ impregnation of ferric-salt)were furtherly discussed.And post-impregnation modification was also conducted as comparative experiment.A novel in-situ magnetic modified sludge carbon IM-WNC and a post-magnetic modified carbon PM-WNC were prepared by response surface design optimization.The adsorption/desorption rate,adsorption isotherms,heat transfer performance of adsorption bed,refrigeration capacity and refrigeration power of methanol refrigerant were comprehensively compared.The results showed that the in-situ impregnation(IM-WNC)maintained higher total pore volume(0.6608cm^(3)/g)and specific surface area(1122m^(2)/g).Therefore,the heat transfer coefficient(600kg/m^(3),4.586W/(m·K))and the equilibrium adsorption capacity((528.74±15.86)mg/g)were significantly improved.The maximum methanol adsorption capacity calculated by Langmuir isotherm model of IM-WNC reached up to(673.99±13.52)mg/g.The maximum temperature difference in center position of adsorption refrigeration bed of IM-WNC reached to 69.07℃(adsorption-desorption cycle at 100℃/25℃).When the cycle time was 76min and desorption temperature was 100℃,the refrigeration capacity(RC)and refrigeration power(RP)of IM-WNC adsorption refrigerating bed reached to 501.43kJ/kg and 799.06kJ/(kg·h),respectively.And the increases of RC and RP

关 键 词：市政污泥 活性炭 吸附 甲醇 脱附 

分 类 号：X705[环境科学与工程—环境工程] TU992.3[建筑科学—市政工程]