Imbalance heat transfer in the combined feed exchangers

[Yousif]

We are experince imbalance heat in the hydrocraker combined feed exchangers which result in low tempreature in one side of the exchanger and high in the other side. The problem is unique and what ever the unit is depressurized the problem swith from one pass to the other pass. I would like to know if anyone heard of such problem in the industrial and the way to resolve it.

I couldn't insert the PFD, but the exchanger having two parall passes with six exchanger in serious each and exchanger tempreature between the feed (HC+H2) in the shell side and reactors effluent in the tube side. It is worth mentioned that the effluent from the reactor is symmetrical and there is no control on it.

Looking forward to hear from you,

 

[Navin A S]

The most common way to address this issue is through a combination of process modifications and mechanical design modifications. Process modifications can include adjusting the flow rate of the HC+H2 feed, increasing the pressure drop across the exchanger, or introducing additional cooling tubes into the exchanger. Mechanical design modifications can include increasing the baffle spacing to improve the flow distribution, or increasing the number of passes in the exchanger to reduce the temperature difference across the exchanger. It may also be beneficial to consider using a different type of exchanger, such as a shell and tube or plate heat exchanger, which may be better suited to address the issue.