Reasons for high pressure difference in the reactor
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This post was last edited by Adventure Wang on 2016-12-27 at 21:15. The pressure difference in the upstream reactor for crude oil hydrogenation has been a bit high recently; what’s going on? Also, why is steam escaping from the tube bank in the convection chamber of the hydrogen production raw material vaporization furnace?
Is the first question referring to the system pressure difference? If it is high, water injection can be increased appropriately. If the catalyst bed is large, the number of times the pre-filter needs to be replaced should be increased; the feed pump’s filter also needs to be cleaned frequently, as does the filter in the feeding area. Impurity tests should be conducted on the feed material. If all these measures have been tried, the space velocity can be increased gradually. If the pressure continues to rise, coking will occur and the system will need to be shut down for replacement. Is the second problem that the steam pipe is leaking? Can’t we see the valve timing changes?
1. The crude oil contains many impurities, which leads to an increase in the pressure drop across the bed; it is recommended to install an additional crude oil filter. 2. If the pressure difference exceeds 0.3 MPa, the reactor should be drained and its catalyst replaced with a new one
There are many impurities in the raw materials, the catalyst cokes, the catalyst gets crushed, and the pressure difference is too high; in such cases, the reactor should be equipped with new catalyst.
If it is merely an increase in reactor pressure differential, shutting down the unit for dumping should be considered
Mainly, the reformed furnace has no steam. I’ve also always been wondering, burned gas. .
1. The raw materials contain many impurities that have not been properly filtered, resulting in clogging of the catalyst bed； 2. Unstable operation, catalyst coking or crushing ； If the pressure difference is large and continues to increase, it is recommended to carry out a head dumping procedure.
Shutdown for catalyst replacement at the top of the reactor (i.e., at the inlet). Reasons for increased reactor pressure difference: increased circulation rate, increased system pressure, increased feed volume, catalyst issues (coking, blockage, crushing)
A high level of impurities, as well as crushed or coked catalysts, can all lead to an increase in pressure difference. Try to hold on as long as possible until maintenance can be carried out; if that’s not possible, then shutdown is the only option. The second issue requires determining whether the pipe is leaking.
Excessive pressure drop: Reason 1. Excessive impurities in the feed oil. 2. Carbon deposition is caused by excessively high temperatures during operation. Steam is escaping: there are sand holes in the furnace tubes of the convection section.