Heat exchange system and process of atmospheric and vacuum distillation unit

Abstract

The invention relates to a heat exchange system and process of an atmospheric and vacuum distillation unit. Heat exchangers having special structures are adopted, multiple streams of material flow are simultaneously or sequentially subjected to heat exchange with material flow in shell pass, the resistance is reduced, the heat exchange efficiency is high, the temperature difference at a hot end is small, the operation is stable, the fouling resistance is good, the occupation area and investment of equipment are reduced, a heat exchange network is optimized, the temperature of a crude oil heat exchange terminal is increased, the crude oil heat exchange temperature can be increased by 4-5 DEG C under the condition that a heat exchange source is unchanged, and the energy saving and consumption reducing effects are very remarkable.

Description

Technical field

[0001] The invention relates to a chemical plant and a process, in particular to a heat exchange system and process for an atmospheric and vacuum plant. Background technique

[0002] Heat exchange is a very important means of energy exchange and recycling in chemical plants. Atmospheric and vacuum equipment is a device that uses distillation to cut crude oil into naphtha, jet fuel, diesel, wax oil and vacuum residue fractions according to the different boiling points of the components in crude oil. The level of its distillation technology is directly related to the level of distillation technology The quality, profit and economic benefits of subsequent devices. As the first process of crude oil processing, the energy consumption of the atmospheric and vacuum unit accounts for about 14% to 15% of the total energy consumption of the entire refinery. Through the heat exchange system, the crude oil exchanges heat with each distillate oil, and the residual heat of ea...

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