摘要：For separating some specific four component mixtures into four products, the four-product dividing wall column(FPDWC) with two partition walls can provide the same utility consumption with the extended Petlyuk configuration, although with structure simplicity. However, the reluctance to implement this kind of four product dividing wall column industrially also consists in the two uncontrollable vapor splits associated with it. The vapor split ratios are set at the design stage and might not be the optimal value for changed feed composition, thus minimum energy consumption could not be ensured. In the present work, a sequential iterative optimization approach was initially employed to determine the parameters of cost-effective FPDWC. Then the effect of maintaining the vapor split ratios at their nominal value on the energy penalty was investigated for the FPDWC with two partition walls, in case of feed composition disturbance. The result shows that no more than + 2% above the optimal energy requirements could be ensured for 20% feed composition disturbances, which is encouraging for industrial implementation.

摘要：针对混合过程强化,提出一种基于流型结构构造的混合设备设计方法,即通过构造特定的流型结构达到强化混合的目的.该方法提出以混合过程的熵产作为目标函数,通过变分法构造拉格朗日乘子方程,最终得到熵产达到极值时的流型结构.模拟结果表明所构造的流型结构能有效强化混合过程.为了验证该方法的实用性,以烟气脱硝过程中的氨气/空气混合过程为例,利用该方法得到能够强化混合过程的特定流型结构.最后利用所得到的流型结构,借助多孔介质模型设计出具有内部结构的混合器.

摘要：建立了汽车排气系统的三维计算流体力学模型,并采用并行计算方法对某排气系统的5款设计方案进行了模拟计算。以排气背压为评判准则,方案3背压最大,方案2背压最小,方案1、4和5的背压基本接近。通过对5种设计方案的催化转化器、消声器等部件进行详细的流场分析,找到了各款排气系统背压产生的主要原因,并提出了进一步的改进措施,确定了排气系统的最佳方案。

摘要：目前,CO2排放问题已经成为世界各国可持续发展面临的重要挑战。以化学溶剂吸收法工艺为基础的燃烧后脱碳是当前比较成熟的已进入工业规模实验的技术路线。而氨水作为一种新的吸收剂受到广泛关注。以气相体积传质系数(KGae)作为表征,对规整填料塔中氨水吸收CO2的传质性能进行了研究,探索了气速、CO2分压、液速和氨水浓度对KGae的影响。实验结果表明,在本文的工况条件下,KGae随液速和氨水浓度的增大而增大,随CO2分压的增大有所减小,气速对KGae的影响不大。实验结果对今后填料塔的设计工作的经济性和合理性有一定指导作用。