Continuous reforming
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The temperature in the recent reduction zone of the continuous reforming U3 has been consistently low, approaching the shutdown value. The flow rate of the reducing gas in this zone is normal, and the material level indication is also normal – so why is the temperature in the reduction zone decreasing?
This post was last edited by Purification on 2012-3-27 at 20:53. There could be many reasons for this; first and foremost, it is necessary to conduct a comprehensive analysis of the trends in temperatures at all points in the reduction zone, including the inlet temperatures of the primary and secondary reduction gases, as well as the outlet temperatures of these gases. Only after a comprehensive analysis is it possible to reach a correct judgment. A low temperature in the reduction section can generally be analyzed from the following aspects: 1. Issues with the instrument thermocouples. 2. Catalyst circulation issues: a) Excessive amount of catalyst being circulated; b) The catalyst entering the reduction section at too low a temperature; c) Collapse of the catalyst bed, which causes the catalyst to drop rapidly (for more information on this issue, please refer to my post on catalyst bed collapse at http://bbs.hcbbs.com/thread-958593-1-1.html). 3. Issues related to the flow rate or temperature of the reducing gas. 4. Considerations related to the catalyst reduction process itself – for example, the impact of CO in the reducing gas on the reduction process, the impact of H2O, and the impact of hydrocarbons. The heat effects associated with these reactions are exothermic. In my analysis, although there is indeed a certain amount of heat generated during these reactions, it may not be sufficient to reduce the temperature of the catalyst bed below the interlock threshold. Of course, this is just one consideration.
The original poster can send a screenshot of the operation screen and then conduct an analysis
If the flow rate of the reducer gas is increased while the pressure remains constant, will the increased flow rate fluidize the catalyst?
There will be no problem with fluidization; fluidization will not occur unless the differential pressure is low! !
The reduction reaction should be endothermic, right?
After the reduction hydrogen carried water, there was a leak in the vapor heater, causing the temperature in the reduction section to drop. Additionally, interlocking the fourth and fifth points in the reduction section can help monitor the catalyst level; moreover, increasing the flow rate and temperature of the reducing hydrogen is also beneficial.