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

从绿色化学的角度来看，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。直接催化金属壁的壁式反应器作为满足这一要求的反应器而备受关注。本文研究了该反应体系的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。反应器由交替反应通道组成，在热介质通道之间采用化学镀法制备板翅型催化剂。此外，还研究了原料气流量快速变化时反应器的动态响应。壁式反应器的温度分布表明，即使在能耗较大的反应工况下，壁式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的高度和插入反应通道的板翅的形状。当使用锯齿形翅片时，性能随高度的降低而提高。从反应器内温度分布估计的总体传热系数表明，由于改变了通道高度，反应器的导热性得到了改善，从而提高了性能。反应达到稳态所需时间短，表明所建反应器对负荷波动响应快。此外，在数值模拟中推断，壁式反应系统在热能相互利用方面可以提供稳定的运行。

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.