褐煤热解特性及宏观反应动力学研究

采用自主研发的单次处理量为3 kg的热解炉装置测定了不同炉温和试验时间下物料的温度分布和挥发分析出率,并利用此数据,获得了褐煤热解的宏观反应动力学参数,从而为褐煤热解工艺包的形成奠定了基础。     

A Method to Obtain Gas-PDMS Membrane Interaction Parameters for UNIQUAC Model

The recovery or capture of one or more components from gas mixture by membrane separation has become a research focus in recent years. This study investigates the gas-membrane solution equilibrium, for which Henry’s law is not applicable if the gas phase is a mixture. This problem can be solved by using UNIQUAC model to calculate the activity coefficient of gas dissolved in the membrane. A method was proposed in this study to obtain the gas-membrane interaction parameter for UNIQUAC model. By the experiments of gas permeation through polydimethylsiloxane PDMS membrane, the solubility coefficients of some gases (N₂, CO₂, CH₄) were measured. Through non-linear fitting UNIQUAC model to the experimental results from this study and in literature (H₂, O₂, C₃H₈), the gas-membrane interaction parameters for these gases were obtained. Based on these parameters, the activity coefficients of the dissolved gas were calculated by UNIQUAC model, and their values agree well with the experimental data. These results confirm the feasibility and effectiveness of the proposed method, which makes it possible to better predict gas-membrane solution equilibrium.     

多组分气体混合物在PDMS膜中渗透过程的模拟

近来,利用膜分离法进行可挥发性有机蒸汽(VOCs)的回收受到越来越广泛的关注.但是,对于多组分气体混合物,尤其是含有VOCs的多组分气体混合物在膜中的气体渗透过程的模型模拟则很少有人研究.因此,提出用MS与UNIQUAC的组合模型(MS-U)预测含有VOCs的多组分气体混合物在聚二甲基硅氧烷膜(PDMS)中的渗透过程.与实验数据对比表明:模型对于含有VOCs的气体混合物在PDMS膜中的渗透过程有着很好的预测效果.模型对于多组分气体的预测结果表明:较低的操作温度,适中的进料压力和正戊烷组成,较小的正己烷组成有利于从石油气中回收正戊烷.     

褐煤干燥及复吸特性试验研究

为考察褐煤干燥过程中干燥温度、干燥时间等条件对褐煤脱水效果的影响,以及获得用于估计褐煤干燥效果和干燥时间的半经验关联式,在自主研发的单炉处理量为3kg的低温热解试验系统中进行了褐煤干燥试验,获得了干燥温度及干燥时间对预热段的干燥效果影响不大,但对恒速干燥段的影响明显,降速干燥段次之的定性结论。     

确保混凝土工程质量的施工技术与经验

本文分析了混凝土标号与混凝土平均强度及标准差的关系,提出了混凝土质量控制中心环节,介绍一些常见问题和预防措施。     

关于住宅小区停车问题探讨

针对住宅小区停车问题和具体设计住宅小区停车设施时存在的问题,通过对住宅小区停车问题影响因素的分析和停车方式的比较,提出解决停车的办法。