Design and development of a wall-type reaction system for achieving a green chemistry

从绿色化学的观点来看，催化反应器需要有效的热能交换、快速的负载响应和缩小的尺寸。由金属壁直接催化的壁式反应器正吸引着人们的兴趣，因为它将满足这种需求。本研究对该反应体系板式催化剂的制备方法及其反应性能、传热性能和负荷波动性能进行了研究。该反应器由交替的反应通道和热媒通道间化学镀制备的板翅型催化剂组成。壁式反应器内的温度分布表明，即使在能耗较大的反应条件下，该反应器也能有效地向反应区提供热能。此外，反应器处理进料的性能取决于通道高度和插入反应通道的板翅片的形状。随着高度的降低和使用锯齿状翅片，其性能提高。根据反应器内的温度分布估算的总换热系数表明，由于改变通道高度改善了反应器的导热系数，因此性能得到了提高。反应达到稳定状态所需时间较短，表明所建反应器对负荷波动的响应速度较快。此外，在数值模拟中，推测壁式反应系统将在热能的相互利用中提供稳定的运行。

A catalytic reactor requires an effective exchange of heat energy, a quick load response and a downsized dimension, from the view point of the green chemistry. A wall-type reactor, which metallic wall is directly catalyzed, is attracting interest as a reactor that would satisfies such demands. This research studied a preparing method of a plate-type catalyst for that reaction system and its performance of reaction, heat transfer and load fluctuation. The reactor consists of alternating reaction channels with a plate-fin type catalyst prepared by electroless plating between heat medium channels. Furthermore, the dynamic response of the reactor was also examined when the flow rate of feed gas was rapidly changed.The temperature profiles in the wall-type reactor demonstrated that the reactor effectively supplies heat energy to reaction zone, even under the reaction condition with a large amount of energy consumption. In addition, the performance of the reactor to handle the feeding material depended on the channel height and the shape of the plate fins inserted into the reaction channel. The performance increased as the height decreased and when serrated-type fins were used. The overall coefficient of heat transfer estimated from the temperature distribution in the reactor suggests that the performance increased because the heat conductivity of the reactor improved as a result of changing the channel height. The time required for the reaction to attain steady state was short, indicating that the constructed reactor responds to load fluctuation quickly. Furthermore, in numerical simulation, it was inferred that the wall-type reaction system would provide a stable operation in mutual utilization of thermal energy.