What to do if there is severe gas blockage in the heating furnace for the fractionated feed in diesel hydrogenation?

Is it because the raw material contains water? If so, strengthen the dehydration process.

The opening degree of the branch valve should be ensured, with no deviation allowed

Local overheating: adjust the burner and enhance raw material dehydration.

This post was last edited by Zhongyuanren on 2010-1-1 19:50. What should be done if there is severe gas blockage in the heating furnace for the fractional feed in diesel hydrogenation? First of all, it should be noted that the heating furnace is the reboiler of the distillation tower. Secondly, to determine the cause of gas resistance, it is necessary to analyze whether the initial boiling point of the raw material used in diesel hydrogenation is greater than 160°C ； ⒈If the initial boiling point of the feedstock is less than 160°C, it indicates that there are too many light components in the feedstock, and the upstream units need to adjust their operations ； ⒉The initial boiling point of the feedstock is greater than 160°C, while that of the feed to the distillation column is less than 160°C, indicating intense hydrocracking. This requires lowering the reaction temperature, increasing the hydrogen-to-oil ratio, or raising the space velocity; adjustments should be made based on the specific circumstances ； Thirdly, if the temperature at the bottom of the tower is too high, it is necessary to reduce this temperature appropriately ； Fourth, if the steam stripping volume at the bottom of the tower is too high, it is necessary to reduce the stripping volume appropriately ； Fifthly, if the reflux flow at the top of the tower is too high, too many light components are pushed to the bottom of the tower; in such cases, the reflux rate needs to be reduced and the amount of light components discharged outside needs to be increased.

First, I will learn from everyone*； Here are my personal opinions: 1. The bottom heater of a fractionation tower is essentially a reboiler. 2. Under normal conditions, the feed to the bottom reboiler is supplied through multiple streams; I’m not sure how many streams there are in your case The phenomenon of air resistance should be what [Zhongyuanren] mentioned upstairs: the temperature at the bottom of the tower, the lightness of the components, etc. 3. Generally, if there is a reboiler at the bottom of the distillation column, steam stripping is not required. The above are my views; please give me your guidance.

What to do if there is severe gas blockage in the heating furnace for the fractionated feed in diesel hydrogenation? Since the specific details weren’t clarified, it’s difficult to judge. Generally speaking, this kind of problem does not occur under normal circumstances. The current design is highly mature, especially the hydrofining process. This situation occurs quite frequently during the startup phase; within a certain temperature range during the gradual increase in temperature, it is easy for the pump to experience vacuum conditions. In such cases, you need to restrict the flow at the pump’s outlet valve, and once the temperature rises further and passes beyond that range, the problem will be resolved.

Try to reduce the tower pressure appropriately; you can also consider adding a direct feed line to the light oil fractionation tower in order to reduce the load on the reboiler

Is the diesel cut point too low, causing the gasoline components to vaporize? It might also be carrying water. Then attention must be paid to catalyst protection