SAPO-34与ZSM-5沸石的动态吸附特性
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摘要
采用称重法对颗粒状的SAPO-34和条状的ZSM-5在恒温恒湿箱中对水的吸附特性进行实验研究。将2种沸石的动态吸附特性曲线和吸附等温线进行拟合。实验结果表明,在同一温度下两种沸石的吸附率均随相对湿度的增加而增大,但是SAPO-34在空气相对湿度70%~80%范围内变化较敏感,而ZSM-5在相对湿度60%~70%范围内变化较敏感。它们的吸附速度是时间的减函数,但是随温度和相对湿度的增加而增大。与ZSM-5相比,SAPO-34作为吸附剂可以缩短循环吸附时间。另外比较2种沸石的吸附等温线发现,SAPO-34的冷凝温度较高,对环境的要求较低,因此更适于夏季空调、制冷系统。
Granules of SAPO-34 and strips of ZSM-5 zeolites had been experimented in the constant temperature andhumidity box to measure water adsorption characteristics of two materials by using weighing method.The adsorptioncharacteristic curves and the dynamic adsorption isotherms of two kinds of zeolites were fitted.The experimental resultsshow that the adsorption rates of two kinds of zeolites increase with the increasing of relative humidity under the sametemperature.But SAPO-34 is more sensitive to air relative humidity of 70%-80% range and ZSM-5 is more sensitive to airrelative humidity of 60%-70% range.The adsorption speed is a decreasing function of time,but it increases with theincreasing of temperature and relative humidity.Compared with the ZSM-5,as the absorbent,SAPO-34 can shortencyclic adsorption time.In addition,the condensation temperature of SAPO-34 is higher by comparing the adsorptionisotherms of two kinds of zeolites.So SAPO-34 is more suitable for summer air conditioning and refrigeration system.
Granules of SAPO-34 and strips of ZSM-5 zeolites had been experimented in the constant temperature andhumidity box to measure water adsorption characteristics of two materials by using weighing method.The adsorptioncharacteristic curves and the dynamic adsorption isotherms of two kinds of zeolites were fitted.The experimental resultsshow that the adsorption rates of two kinds of zeolites increase with the increasing of relative humidity under the sametemperature.But SAPO-34 is more sensitive to air relative humidity of 70%-80% range and ZSM-5 is more sensitive to airrelative humidity of 60%-70% range.The adsorption speed is a decreasing function of time,but it increases with theincreasing of temperature and relative humidity.Compared with the ZSM-5,as the absorbent,SAPO-34 can shortencyclic adsorption time.In addition,the condensation temperature of SAPO-34 is higher by comparing the adsorptionisotherms of two kinds of zeolites.So SAPO-34 is more suitable for summer air conditioning and refrigeration system.
引文
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[3]张辉,滕毅,王如竹.吸附式制冷系统传热传质的简化分析及吸附床的设计[J].低温工程,1995,88(6):43—48.Zhang Hui,Teng Yi,Wang Ruzhu.Heat and mass transfer&design of adsorbent beds in adsorption refrigeration systems[J].Cryogenic Engineering,1995,88(6):43—48.
[4]王如竹,戴维,周衡翔,等.国产活性炭-甲醇吸附式制冷性能研究[J].太阳能学报,1995,16(2):155—161Wang Ruzhu,Dai Wei,Zhou Hengxiang,et al.Study on the adsorption refrigeration performances of domestic activated carbon-methanol pairs[J].Acta Energiae Solaris Sinica,1995,16(2):155—161.
[5]方利国,汪立军,朱冬生,等.吸附式制冷中吸附剂传热传质的强化[J].高校化学工程学报,1998,12(3):17—22.Fang Liguo,Wang Lijun,Zhu Dongsheng,et al.Mass and heat transfer enhancement of adsorbent in adsorption refrigeration[J].Journal of Chemical Engineering of Chinese Universities,1998,12(3):17—22.
[6]桂贤,吴立志.太阳能固体吸附式制冷系统吸附床内单元管传热传质分析[J].北京石油化工学院学报,2004,12(4):1—5.Gui Xian,Wu Lizhi.Analysis of heat and mass transferof single tube in the adsorbent bed of solar solidadsorption refrigeration system[J].Journal of BeijingInstitute of Petro-Chemical Technology,2004,12(4):1—5.
[7]Lu Z S,Wang L W,Wang R Z.Experimental analysisof an adsorption refrigerator with mass and heat-pipeheat recovery process[J].Energy Conversion andManagement,2012,(53):291—297.
[8]芮征球,李全国,崔群,等.SAPO-34分子筛-水工质对吸附制冷性能研究[J].高校化学工程学报,2014,28(2):229—233.Rui Zhengqiu,Li Quanguo,Cui Qun,et al.Studies onSAPO-34-water working pair for adsorption[J].Journalof Chemical Engineering of Chinese Universities,2014,28(2):229—233.
[9]王如竹,王丽伟,吴静怡.吸附式制冷理论与应用[M].北京:科学出版社,2007,25—26.Wang Ruzhu,Wang Weili,Wu Jingyi.Adsorptionrefrigeration theory and application[M].Beijing:Science Press,2007,25—26.
[10]S Jiangzhou,Wang R Z,Lu Y Z,et al.Experimentalinvestigations on adsorption air-conditioner used ininternal-combustion locomotive driver-cabin[J].Applied Thermal Engineering,2002,22(10):1153—1162.
[11]刘艳玲,余克志,王如竹,等.硅胶-水吸附式制冷系统的设计和性能实验[J].太阳能学报,2012,33(6):968—974.Liu Yanling,Yu Kezhi,Wang Ruzhu,et al.Design andperformance test of the silica-gel and water adsorptionsystem[J].Acta Energiae Solaris Sinica,2012,33(6):968—974.
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[13]Chen Haijun,Cui Qun,Wu Juan,et al.Hydrothermalstability of SAPO-34 for refrigeration and airconditioning applications[J].Materials Research Bulletin,2014,(52):82—88