What is the quality of loading affect the lifetime of primary reforming catalyst?

The quality of catalyst loading in a reformer section directly affects the load distribution of the reformer gas. A tube with a small resistance drop will have a short residence time of the process gas and will not be able to meet the expected process requirements, while a tube with a large resistance drop will be over-tempered due to the low heat absorption reaction. In addition, inappropriate loading may also lead to the phenomenon of "bridging" between catalyst particles in the tube, so that there is no catalyst in the local area, and the incoming heat can not be absorbed, which will lead to local over-temperature on the surface of the tube; and if the catalyst is not vibrated during the loading process, the catalyst will be sunk in the process of using, resulting in the dry burning of the empty tube.

In the upper part of the reformer tube, where the methane concentration is high and the reforming reaction is intense, it is suitable to load small granular catalyst to increase the active point of the reaction and strengthen the radial heat transfer of the catalyst; on the contrary, in the lower part of the reformer tube, since the reforming reaction is nearly complete, it is suitable to change to large granular catalyst in order to reduce the resistance of the bed layer. The catalyst should not be loaded at one time, but should be loaded and checked in layers. When checking, the following points should be noted: after each reformer tube is loaded with a predetermined amount of catalyst, it should be mechanically shaken appropriately, and the loading height should be measured (too high is generally due to "bridging", too low is generally due to crushing), and it should be unloaded and reloaded if the loading height is not in accordance with the requirements. In order to further check the quality of filling, the resistance drop of the conversion tube should also be measured after filling.