In the hydroprocessing of gasoline and diesel using a two-stage buffer tank design, where is the typical mixing location for coker gasoline and diesel feedstocks?

Mixing in the primary tank, then passing through the crude oil booster pump and filter before entering the secondary tank

Someone has asked a similar question recently; so far, two mixing methods have been observed: gasoline and diesel are pre-buffered and then transferred to a buffer tank, where they undergo pressurization and filtering before entering the main material buffer tank. Another type of gasoline goes directly to the outlet of the booster pump, without passing through the raw oil pre-buffer tank; it then passes through a filter before reaching the raw oil buffer tank. After two liquid removal steps, the issue of water in the feed can be basically addressed; by going to the raw material buffer tank separately, the frequency of liquid removal has been increased. Generally, a direct feeding system is installed; considerations must be given to interoperability and stability. Feeding from storage tanks is usually more stable, while direct feeding can lead to significant fluctuations in the blending ratio in the hydrogenation unit due to instability in the upstream systems, which is not favorable for the catalysts.

My installation originally used direct feeding of the material into the buffer tank, which served as a first-level buffer; however, this approach did not work well as there were large fluctuations in the composition of the raw material. I changed to feeding the material separately from each tank before it entered the buffer tank, with a feed control valve used to regulate the amount of material entering the installation

Mix in front of the filter to ensure that the filter’s load can be met； After mixing, it enters the raw material buffer tank. It’s more secure

For hydrogenation units used in the processing of coker gas and diesel, what is the typical arrangement regarding the position of the heat exchanger for raw material preheating and the backwash filter? I would appreciate some guidance!