Separation system of saturated hydrocarbon cracking gas and utilization method of rich ethane/propane saturated hydrocarbon

Abstract

The invention belongs to the field of refinery saturated resource utilization, and relates to a separation system of saturated hydrocarbon cracking gas and a utilization method of rich ethane / a propane saturated hydrocarbon. The separation system of the saturated hydrocarbon cracking gas includes a cracking furnace, a waste heat boiler, a quenching water tower, a compressor, an absorption tower, adesorption tower, a reabsorption tower, a drying tower, a deethanization tower, a carbazide hydrogenation reactor and an ethylene rectifying tower, wherein the cracking furnace is connected successively with the waste heat boiler, the quenching water tower and the compressor and then connected with the absorption tower, the tower top of the absorption tower is connected with the reabsorption tower, and the tower kettle of the absorption tower is connected with the desorption tower; the tower top of the desorption tower is connected with the drying tower and then connected with the deethanization tower, and the tower kettle of the desorption tower is connected with the top of the absorption tower; the tower top of the deethanization tower is connected successively with the carbazide hydrogenation reactor and the ethylene rectifying tower; and the tower top of the ethylene rectifying tower is connected with the compressor, the tower kettle of the ethylene rectifying tower is connected with the cracking furnace, and the side part of the ethylene rectifying tower is connected with the production line of polymer grade ethylene products. According to the separation system of the saturated hydrocarbon cracking gas and the utilization method of the rich ethane / the propane saturated hydrocarbon, investment is low, energy consumption is low, the process is simple, and the investment recovery rate is high.

Description

technical field [0001] The invention belongs to the field of utilization of saturated resources in refineries, and more specifically relates to a saturated hydrocarbon cracking gas separation system and a method for utilizing saturated hydrocarbons rich in ethane / propane. Background technique [0002] Ethylene and propylene are important basic chemical raw materials. In the industrial production process, ethylene and propylene are mainly produced by steam cracking (ie thermal cracking) process. In the steam cracking production device, after the cracking raw materials such as light hydrocarbons, naphtha, hydrogenated tail oil, light diesel oil are mixed with water vapor, a thermal cracking reaction occurs in the cracking furnace to generate hydrogen, methane, C2, C3, C4, C5, pyrolysis gasoline, pyrolysis fuel oil and coke and other pyrolysis products. The pyrolysis products are separated and purified in the subsequent separation system to obtain fractions with different carb...

AI Technical Summary

Problems solved by technology

At present, the C2C3 concentrated gas recovered from the tail gas of the refinery is mainly sent to different sections of the ethylene plant to increase the production of ethylene propylene. However, for refineries without ethylene production facilities nearby, the concentrated gas The whereabouts is a major problem, resulting in the C2C3 resources in the dry gas not being fully utilized, resulting in a large waste

If the traditional pyrolysis compression cryogenic separation method is used to process saturated resources and ethane propane in dry gas, the investment recovery rate is low and the energy consumption is high

Images