实验研究结果表明：分子筛催化剂颗粒粒径的大小对壁面传热系数和总传热系数影响大，而对中央区的传热系数无影响。
Experimental results reveal that this diameter exerts strong influence to the overall heat transfer coefficients and that on the wall, but irrelevant to that in the central zone.
采用混合管束既可获得高的总传热系数和管内外传热膜系数，又可以使管内压降不致过大。
Using mixed tube bundle, high heat transfer coefficient can be acquired as well as pressure drop not too high.
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