基于热流逸效应的串联式气体分离系统设计

利用热流逸效应分离气体是一种在机理和应用模式上与传统分离方法完全不同的新颖方法。本文提出了一种由模块化热流逸式气体分离单元串联而成的气体分离系统，建立了描述其气体分离过程及关于其优化设计的数学模型，并开发了相应算法。以此为基础设计了热流逸式焦炉煤气分离制氢系统并解析其系统结构、部件和运行工况参数；该系统通过6级气体分离单元串联即可分离出纯度达99%以上的氢气，且其部件的制造及装配均可基于现有技术实现。在满足分离纯度要求的前提下，该系统能耗约为45.41kJ/m³，其优势在于可直接利用低品位热能驱动，符合能量梯级利用原则，从用能角度看也具有一定竞争力。基于热流逸效应的气体分离新技术具有鲜明特点，值得深入研究并在实践中尝试。

A design of cascade type gas separation system based on thermal transpiration effect

The gas separation employing thermal transpiration effect is a novel method different from traditional gas separation methods in terms of mechanism and application mode. A novel modular gas separation system composed of thermal-transpiration-effect-based gas separation unites in series was proposed. A mathematical model with corresponding algorithms was established to describe the gas separation process and optimal design for the proposed system. On this basis, this type of system was designed to separate hydrogen from the coke oven gas with the corresponding structural arrangements, parts and operating parameters determined. Its parts can be manufactured and assembled by existing technologies. Purity of hydrogen obtained from the system was >99% when six gas separation units were set in series. Energy consumption of the system was 45.41kJ/m³ when separation purity was satisfied. The system conforms to the principle of energy cascade utilization since it can be directly driven by low-grade heat, which makes it competitive from the viewpoint of energy utilization. The emerging gas separation technology based on thermal transpiration effect is worth studying deeply and trying in practice due to its distinct characteristics.