Overview of Heating furnace of atmospheric and vacuum distillation unit
Atmospheric distillation tower feed heating furnace referred to as atmospheric furnace, vacuum distillation tower feed heating furnace referred to as vacuum furnace, they belong to the distillation type heating furnace.
Furnace type selection
● When the heat load is not greater than 30MW, the radiation-convection type cylinder furnace is preferred
● When the heat load is greater than 30MW, the vertical tube vertical furnace, the vertical tube double chamber box furnace or the twin round furnace is usually selected
● Horizontal tube furnace is preferred for lubricating oil type decompression furnace or deep drawing decompression furnace
Furnace tube material selection
The furnace tube material of the atmospheric and vacuum device is mainly selected according to the sulfur content of crude oil. When the sulfur content of the heating medium is less than 0.5%, carbon steel furnace tubes are generally selected for atmospheric pressure furnaces. When the sulfur content is > 0.5%, carbon steel furnace tube is selected for the convection section, Cr5Mo furnace tube is selected for the radiation section, or Cr5Mo furnace tube is selected for all. Generally, Cr5Mo furnace tubes are used in all decompression furnaces. When the heating medium contains naphthenic acid, and the acid value is greater than 0.5mgKOH/g oil, the furnace tube material of the furnace outlet gasification section is 316L.
Optimization and energy saving measures of heating furnace:
The heating furnace should always be in a stable operating state, while the relevant parameters are in the best proportion state, the combustion is sufficient, the heat exchange is good, and the loss is low. Through timely adjustment, timely control, automatic control and necessary transformation of the heating furnace, it can achieve convenient control, improve thermal efficiency and save energy.
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