Three-top gas online desulphurization and pressurizing utilization method of atmospheric and vacuum distillation unit

Abstract

The invention relates to a three-top gas online desulphurization and pressurizing utilization method of an atmospheric and vacuum distillation unit, which is used for solving the problems of high hydrogen sulfide content, high recycling cost, high point venting, and the like in primary distillation tower top gas, atmospheric pressure tower top gas, decompression tower top gas and post-condenser exhaust gas of the conventional atmospheric and vacuum distillation unit. The method comprises the following steps of: selecting amine atomization spray nozzles to be respectively arranged in the central position of a three-top gas conveying pipeline, automatically controlling the injection volume of each amine atomization spray nozzle by adopting a gas flowmeter signal, fully mixing atomized amineand gases, and removing hydrogen sulfide of gases per share; directly supplying desulphurized primary distillation tower top gas after rotational flow and liquid separation to a heating furnace in the atmospheric and vacuum distillation unit by utilizing the discharge pressure thereof; and carrying out drainage pressurization and mixing on desulphurized atmospheric pressure tower top gas, decompression tower top gas and post-condenser exhaust gas by adopting a fuel gas injector, and supplying to the heating furnace of the atmospheric and vacuum distillation unit, therefore, the harms caused by the hydrogen sulfide in three-top gases of the atmospheric and vacuum distillation unit are comprehensively and systematically solved, and the most cost-effective utilization of the atmospheric and vacuum distillation unit is achieved.

Description

technical field [0001] The invention relates to a method for online removal of hydrogen sulfide in a gas pipeline, in particular to a method for online desulfurization and pressurized utilization of "three top" gas in an atmospheric and vacuum device. Background technique [0002] During the production process of the atmospheric and vacuum unit, part of the sulfide in the crude oil is converted into hydrogen sulfide under high temperature conditions, and exists in the “three tops” gas of the atmospheric and vacuum unit (primary distillation tower top gas, atmospheric pressure tower top gas, decompression Tower top gas and post-condenser tail gas), the hydrogen sulfide content is as high as tens of thousands to hundreds of thousands of ppm (v). Hydrogen sulfide is extremely toxic. Wet hydrogen sulfide is extremely corrosive to carbon steel, and sulfur dioxide is generated after combustion, which will pollute the atmosphere; leakage and emission of gas containing hydrogen sulf...

AI Technical Summary

Problems solved by technology

This set of facilities reduced the hydrogen sulfide content of the decompression tower top gas from 200,000 ppm(v) to several hundred ppm(v), which did not meet the refining industry standard of hydrogen sulfide content in fuel gas≯100ppm(v); amine liquid The consumption has greatly exceeded the normal consumption of amine liquid; amine liquid foaming and amine running have occurred during operation; at the same time, the problem of hydrogen sulfide in the top gas of the initial distillation tower, the top gas of the atmospheric pressure tower, and the tail gas of the after condenser has not been solved. question

Images