Heat Exchange Assembly for Hydrogenation of Diesel and Wax Oil, and Hydrogenation System

A heat exchange assembly for hydrogenation of diesel and wax oil, comprising:

• a first heat exchanger (110) having a first hot medium passage and a first cold medium passage;
• a second heat exchanger (120) having a second hot medium passage and a second cold medium passage;
• a third heat exchanger (130) having a third hot medium passage and a third cold medium passage;
• and
• a fourth heat exchanger (140) having a fourth hot medium passage and a fourth cold medium passage;
• wherein, each of the hot medium passages and cold medium passages has an inlet and an outlet;
• the inlet of the first hot medium passage is used for importing a first-stage reacting product, the inlet of the first cold medium passage is used for importing a first-stage reacting feedstock, the outlet of the first cold medium passage is used for exporting the first-stage reacting feedstock after heat exchange;
• the inlet of the second hot medium passage communicates with the outlet of the first hot medium passage, the outlet of the second hot medium passage communicates with the inlet of a hot high separation tank (500), the inlet of the second cold medium passage is used for importing bottom liquid of a stripping tower;
• the inlet of the third hot medium passage is used for importing a second-stage reacting product, the inlet of the third cold medium passage communicates with the outlet of the second cold medium passage, the outlet of the third cold medium passage communicates with a downstream device;
• the inlet of the fourth hot medium passage communicates with the outlet of the third hot medium passage, the outlet of the fourth hot medium passage communicates with the inlet of the hot high separation tank (500), the inlet of the fourth cold medium passage is used for importing a second-stage reacting feedstock, the outlet of the fourth cold medium passage is used for exporting the second-stage reacting feedstock after heat exchange.