蜂窝固体除湿器的制备及数值模拟

发布时间：2018-03-11 17:03

本文选题：改性硅胶　切入点：除湿床　出处：《华南理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：环境湿度的控制对人们的生活、物品储藏和工业生产都有着十分显著的意义。本文采用一步法将附着水玻璃的玻璃纤维纸浸渍在酸溶液中反应，生成改性硅胶吸湿剂，再与一定浓度LiNO_3复合，生成改性硅胶复合材料。通过扫描电镜（SEM）、能谱（EDS）、红外（FTIR）及孔径分布测试仪分析，结果显示制备的复合材料中含有铝元素和LiNO_3，并验证材料的主要成分是SiO_2nH_2O。BET孔径分布结果显示复合材料的比表面积是476.96m~2/g，孔容是0.301cm~3/g，平均孔径是4.783nm，比表面积和孔容较纯硅胶均有所增大。本文对改性硅胶复合材料制备的除湿器进行动态测试，测试了处理空气参数、再生空气参数和操作周期对系统除湿性能的影响。处理空气的含湿量、风量越大、进口温度越低，除湿量和DCOP（除湿性能系数）越大；提高再生空气的风量，系统的除湿性能增加。随着处理空气的风量和含湿量增加，系统的除湿效率降低了，影响送入空气的相对湿度。再生温度对系统的除湿性能影响较大，再生温度增大除湿量增大；DCOP在不同的再生温度下有一个最大值。本文对固定除湿床的传热传质过程进行了数值模拟，对比得模拟值跟实验值相差30%-40%，主要原因是实验装置中存在热惰性。对13X分子筛和RD型硅胶所制备的除湿器的除湿性能也进行模拟，对比模拟结果发现：在高温高湿和低温高湿工况下，由改性硅胶所制备的除湿器除湿性能最好。在高温低湿和低温低湿工况下，再生温度高于60℃时，由13X分子筛制备的除湿器SDP（单位质量除湿剂单位时间除湿量）最大；再生温度低于60℃时，改性硅胶的SDP最大。在这四种工况下，改性硅胶制备的除湿器的除湿性能DCOP最大，13X分子筛最小。
[Abstract]:Control of environmental humidity on people's life, has a very significant meaning of goods storage and industrial production. This paper uses the impregnated glass fiber paper one-step attaching water glass reaction in acid solution, to produce a modified silica gel, with a certain concentration of LiNO_3 composite, a modified silica gel by composite materials. Scanning electron microscopy (SEM), energy spectrum (EDS), infrared (FTIR) and pore size distribution test, the results showed that the composite material in the preparation of aluminum containing elements and LiNO_3, and verify the main composition of material is SiO_2nH_2O.BET pore size distribution showed that the specific surface area of the composite is 476.96m~2/g, Kong Rong is 0.301cm~3/g, the average pore size is 4.783nm, specific surface area and pore volume than the pure silica gel has increased.
Based on the modified silica gel composite preparation dehumidifier for dynamic testing, air parameters test, effects of regeneration air parameters and operation cycle of the system. The dehumidification performance of air moisture content, the greater the air inlet, the lower the temperature, the dehumidification and DCOP (dehumidification coefficient) increased; improve the regeneration air flow rate, increase the dehumidification performance of the system. With the air flow rate and moisture content increase, dehumidification efficiency of the system is reduced, the influence of relative humidity to air. Great influence on the system performance of dehumidification and regeneration temperature, regeneration temperature increase dehumidification increases; DCOP has a maximum value in the regeneration of different temperatures.
In this paper, the numerical simulation of heat transfer process of fixed bed dehumidification, compared to the simulated values with the experimental value is 30%-40%, the main reason is the existence of thermal inertia in the experimental device. The preparation of the dehumidifier dehumidifying performance of 13X zeolite and silica gel RD are also simulated, compared simulation results showed that: in the high temperature and humidity low temperature and high humidity condition, dehumidifier dehumidifying performance of as prepared by the modified silica gel. The best in high temperature and low humidity and low temperature and low humidity conditions, the regeneration temperature is higher than 60 degrees by 13X molecular sieve prepared SDP (dehumidification unit mass dehumidifier desiccant unit time) maximum regeneration temperature lower than 60 DEG C; SDP, modified silica gel. Under these four conditions, modified silica gel prepared by the dehumidifier dehumidifying performance of 13X molecular sieve DCOP maximum, minimum.

【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU834.9

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