Coking, absorbing and stabilizing energy-saving process

Abstract

The invention discloses a coking, absorbing and stabilizing energy-saving process. The process comprises the following steps: (1) feeding compressed rich gas from refined and coked gasoline and diesel, desorbed gas taken out from the tower top of a desorption tower and rich absorption oil taken out from the tower bottom of an absorption tower to the bottom, middle part and top of a fluid contact heat exchange tower respectively to carry out contact and heat exchange; and (2) feeding the total gas phase at the tower top of the fluid contact tower directly used as a feeding material to the bottom of the absorption tower, simultaneously dividing the liquid phase at the tower bottom of the fluid contact heat exchange tower into two parts, cooling one part of the liquid phase to 40 DEG C through a condenser and feeding the cooled liquid phase as a cooling material to the top of the desorption tower, exchanging heat between the other part of the liquid phase and stabilized gasoline to between 70 and 80 DEG C through a heat exchanger and feeding the heat-exchanged liquid phase as a heating material to the middle upper part of the desorption tower. The process changes the prior direct mixing of the compressed rich gas, the rich absorption oil and the desorbed gas into heat exchange through the fluid contact tower, greatly reduces the cooling load, achieves the aim of saving energy, and has the advantages of reducing energy consumption, reducing desorption gas amount and relieving the load in the desorption tower.

Description

technical field [0001] The invention relates to a petroleum refining process, in particular to an energy-saving process for a delayed coking absorption stabilization system. Background technique [0002] With the development of modern society, saving energy and improving product quality have attracted more and more attention from all walks of life, and the petroleum industry is no exception. [0003] Catalytic cracking is one of the main refining units, and its role is to lighten heavy oil to produce liquefied gas, gasoline and diesel. The absorption and stabilization unit is a downstream separation system in the catalytic cracking unit, which separates the crude gasoline and rich gas from the top of the catalytic fractionation tower into liquefied gas and stable gasoline, and at the same time obtains dry gas as a by-product. The product quality and energy consumption of the absorption stabilization unit have a very important impact on the economic benefits of the entire ca...

AI Technical Summary

Problems solved by technology

However, due to the existing cold and hot double-feed feed, a large amount of gas-liquid mixture is lowered to 40°C, and then the condensed oil heated by stable gasoline is heated to 80°C and then enters the top of the desorption tower, which is "cooling first and then heating". process, the energy loss is large

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