Abstract: The fouling in high-pressure heat exchangers of hydrogenation unit was calculated using MATLAB software, base on the heat balance and film coefficient theory. The calculated results were confirmed to be reliable and were applied to conduct the adding amount of scale inhibitor. With a long-term stable running, the consumption of scale inhibitor was saved 168 t/a, the operation cast of the unit reduced 3.53 MRMB annually.

Key words: high-pressure heat exchanger, fouling, hydrogenation unit, scale inhibitor