The pressure difference in the reactor of the diesel and gasoline hydrogenation unit is continuously increasing; I earnestly request those with experience to share solutions?
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The pressure difference in the reactor of the diesel and gasoline hydrogenation unit is continuously increasing; I earnestly request those with experience to share solutions? In particular, the pressure difference in the first bed layer increased significantly. The reasons for this are as follows: first, the raw material contains gelatinous coking ； Secondly, the olefins and dienes in the raw naphtha undergo polymerization and condensation reactions ； Third, the raw materials contain a small amount of components with a boiling point higher than 380 degrees Celsius ； Fourth, the raw material contains coke particles larger than 25 microns (filter replacement is required to achieve the desired filtration precision) ； Fifth, the metal impurities in the raw materials are kept below 5 ppm.
Regarding the issue of the continuously rising pressure difference in the reactor of the diesel and gasoline hydrogenation unit you mentioned, it is recommended to take the following measures: 1. **Inspect and optimize the filtration system**: Ensure that appropriate filters are used to remove particle coke larger than 25 microns from the feedstock. Replace the filter regularly to ensure effective filtration. 2. **Purification of raw materials**: Reduce the content of high-boiling-point components and metal impurities in the raw materials; the concentration of these impurities can be lowered by improving the distillation process. 3. **Adjust reaction conditions**: Slightly adjust the operating temperature and pressure to prevent the polymerization and condensation reactions of olefins and dienes. 4. **Increase the frequency of reactor cleaning**: Regularly clean the interior of the reactor to remove gums and coke deposits, thereby maintaining unobstructed flow within the bed. 5. **Monitoring device operation data**: Continuously monitor changes in pressure difference and other key parameters to identify issues promptly and adjust operating strategies. 6. **Optimize raw material quality**: Work with suppliers to ensure that the quality of raw materials meets production requirements, thereby reducing the presence of hazardous impurities. Through these measures, the pressure differential issue in the reactor should be effectively controlled and reduced. I hope these suggestions are helpful to you! .
If it’s not too serious, one can turn their head； In severe cases, stop operation to replace the catalyst
Explore whether there is a solution that allows operations to continue without interruption
Only the pressure drop in the first bed is significant; if operation is stopped, it simply means shutting down the unit, and there is no need to replace the catalyst. Consider replacing the catalyst when it reaches the end of its life.
First, check the pressure difference of the filter, taking into account impurities in the feedstock upstream and damaged filter screens. Second, excessive raw material gum leads to coking, and adjustments upstream can be considered. There is nothing adjustable in our device when this happens.
Take regular samples of the raw materials to identify the causes and monitor the level of impurities； Adjust the parameters of raw materials ； Samples were prepared from several raw materials to identify the cause ； Verify the filter’s precision and prepare to replace it. Understand scale inhibitors – is it possible to restore the pressure drop by changing the composition of these inhibitors?
Since a pressure difference has occurred, it indicates that there is already a problem with the upper layer. To maintain production, it is necessary to ensure good quality of the feed; alternatively, the feed volume can be reduced. Eventually, operations must be halted for maintenance. If operations continue for a long time, a pressure difference will also arise in the lower layer – the question then becomes whether to prioritize catalyst protection or continued production
Increase reactor cleaning frequency**: Regularly clean the interior of the reactor to remove gums and carbon deposits, thereby maintaining unobstructed flow within the bed. How to clean the reactor?