摘要
本文通过前体物复配、催化炭化、CO2接触氧化与梯度催化活化相结合的改进工艺,对压块活性炭的孔结构进行原位调控,制备了中微孔同步发达的GHUM型与中孔发达的SX-100型活性炭;以微孔炭GDWK-02为参比,研究了孔结构分布调控对活性炭-甲醇工质对的吸附/脱附特性及制冷性能的影响。结果表明:中微孔同步发达的GHUM炭孔结构促进了对制冷剂的凝聚与扩散作用,对甲醇的吸附量((368.04±4.64)mg/g)、脱附量((375.92±7.38)mg/g)及表面扩散系数(299.32±123.16)较SX-100和GDWK-02均有所提升;且脱附温度为100℃时,GHUM型吸附床内部传热温差高达50℃,制冷室平均温度维持在(23±1)℃,系统制冷量和制冷功率分别可达286.12 kJ/kg、357.65 kJ/(kg·h),满足夏季制冷送风空调系统维持室内恒温的需求,且显示了良好的传热和制冷性能。
Pore structure in-situ-regulation of activated carbons for adsorption refrigeration is conducted via an innovative procedure involving precursor blending,catalytic carbonization,CO2 oxidation,and multi-step activation.New carbon higher total pore volume(GHUM)simultaneously realized well-developed mesopores(0.8819 cm^3/g)and micropores(0.2955 cm^3/g)with a high total volume(1.1774 cm^3/g).After depth-activation in SX-100,higher volume of mesopores(1.1832 cm^3/g)was observed with higher total volume(1.1832 cm^3/g).The effects of pore structure distribution regulation on the adsorption/desorption and refrigeration efficiency of activated carbon-methanol working pairs were examined and compared with those on microporous carbon GDWK-02.The results indicated that condensation and diffusion of refrigerants can be well-promoted by carbons with simultaneously well-developed mesopores and micropores with GHUM.Adsorption and desorption capacities of GHUM for methanol were(368.04±4.64)mg/g and(375.92±7.38)mg/g,respectively.Furthermore,GHUM(299.32±123.16)realized higher surface diffusion coefficient(15Dso/Rp2)than SX-100(242.18±149.33)and GDWK-02(0.3387±0.125).When the desorption temperature was 100℃,the temperature difference of heat exchange in GHUM type adsorption bed was as high as 50℃.Hence,the average temperature of refrigeration room was maintained at(23±1)℃.Furthermore,the system reached a refrigeration capacity(286.12 kJ/kg)and refrigeration power(357.65 kJ/(kg·h))that can maintain the indoor constant temperature of the cooling air-conditioning system in summer and exhibit good heat transfer and refrigeration performance.
作者
公绪金
董玉奇
Gong Xujin;Dong Yuqi(School of Energy and Civil Engineering,Harbin University of Commerce,Harbin,150028,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2020年第5期48-57,共10页
Journal of Refrigeration
基金
国家自然科学基金(51708162)资助项目。
关键词
吸附式制冷
吸附工质对
活性炭-甲醇
孔结构分布
制冷性能
adsorption refrigeration
adsorption working pair
activated carbon-methanol
pore structure distribution
refrigeration performance
