An energy-saving absorption stabilization process and system

Abstract

The invention relates to an energy-efficient absorption stable process and system. The process is as below: mixing compressed rich gas from a rich gas compressor, desorbed gas from a desorption column top and a rich absorbent liquid from an absorption column bottom, condensing the mixture and sending the mixture into a vapor-liquid separation tank; sending a separated liquid phase into the desorption column, sending the materials at the desorption column bottom into a stable column, and separating to obtain a liquefied gas and stable gasoline; sending an isolated gas phase into the absorption column, contacting and reacting the gas phase with a countercurrent absorbent, reacting lean gas discharged from absorption column overhead with a secondary absorbent in a secondary absorption reactor to obtain a gas phase of dry gas; sending a liquid rich absorption oil into a desorption reactor to achieve secondary absorbent regeneration; discharging portion of the regenerated secondary absorbent or returning the regenerated secondary absorbent to a secondary absorption reactor; and returning the gas discharged by desorption reactor to the rich gas compressor through a vacuum pump. The process cancels the inner loop of supplement of stable gasoline absorbent in an original absorption stabilization system, and significantly reduces energy consumption of the system.

Description

technical field [0001] The invention relates to the petroleum refining industry, in particular to a process and a system for stabilizing the absorption of devices such as catalytic cracking and delayed coking. Background technique [0002] The absorption stabilization system is the post-treatment process of the catalytic cracking unit and the delayed coking unit in the petroleum refining industry. Its purpose is to use the principle of absorption and rectification to separate the rich gas and naphtha in the oil-gas separation tank at the top of the fractionation tower into dry gas ( C 2 Below), liquefied petroleum gas (C 3 、C 4 ) and stable gasoline with qualified vapor pressure. The optimization of the unit and process flow of the absorption stabilization system plays a very important role in the energy saving and efficiency enhancement of catalytic cracking and delayed coking units. [0003] At present, there are four towers in the commonly used absorption stabilizatio...

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Problems solved by technology

[0007] At present, the distillation range of diesel oil in my country is 180°C~360°C, and the final boiling point of gasoline is 205°C. Therefore, there is a problem that a certain amount of gasoline is entrained in diesel oil. Because the value of catalytic diesel is low, and the value of catalytic gasoline is high, so low-value Part of high-quality gasoline entrained in catalytic diesel will undoubtedly cause certain economic losses

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