Method and system for naphtha hydrofining low-pressure deoxidation and feed heat exchange optimization

Abstract

The invention method and a system for optimizing hydrorefining low-pressure deoxygenation and feeding heat exchange for naphtha. The method includes that the naphtha is filtered and is subjected to heat exchange, then is fed into a deoxygenation tower to be subjected to deoxygenation treatment, the tower top pressures are flexibly controlled so that different working conditions can be adapted, tower-top gas phases are cooled and then are fed into a tower-top return tank, liquid phases completely return a tower top, and non-condensable gas on the top of the return tank is exhausted into a torch pipe network; a part of deoxygenated naphtha distilled at a tower bottom is fed into a reboiler at the bottom of the deoxygenation tower and is heated to obtain partial gas phases and partial liquid phases, and then the partial gas phases and the partial liquid phases return a tower kettle; heat is exchanged between another part of deoxygenated naphtha distilled at the tower bottom and filtered naphtha, and deoxygenated naphtha is used as a naphtha hydrogenation material after being subjected to heat exchange. The system comprises a naphtha feeding filter, a deoxygenation tower feeding and deoxygenated naphtha heat exchanger, the deoxygenation tower, a deoxygenation tower-top cooler, the deoxygenation tower-top return tank and the deoxygenation tower-bottom reboiler. The method and the system have the advantage that hydrorefining low-pressure deoxygenation and feeding heat exchange for the naphtha can be optimized by the aid of the method and the system.

Description

technical field [0001] The invention relates to a method and system for naphtha hydrofining low-pressure deoxidation and feed heat exchange optimization, belonging to the technical field of petrochemical industry. Background technique [0002] Catalytic reforming units play an important role in the oil refining industry. Under certain conditions of temperature, pressure, presence of hydrogen and the presence of a catalyst, a catalytic reforming unit is used to convert naphtha into reformed gasoline rich in aromatics (benzene, toluene, xylene, BTX for short), and hydrogen can be produced as a by-product . In developed countries, 30% of automotive high-octane gasoline is produced through catalytic reforming. 70% of the world's BTX production is through catalytic reforming technology. [0003] The raw material processed by the catalytic reforming unit is naphtha. Since the catalyst has strict requirements on naphtha raw material, a naphtha hydrorefining unit is set up. Stud...

AI Technical Summary

Problems solved by technology

Feed heat exchange requires 4 to 6 heat exchangers, high equipment costs and large floor space

The heat load of the reboiler at the bottom of the tower is large, and the condensation load at the top of the tower is also relatively large, and the energy consumption is high

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