Cyclone separation technology used for on-line separation of hydrocarbons and solid granules in desulfurized solvent

Abstract

The invention discloses cyclone separation technology used for on-line separation of hydrocarbons and solid granules in a desulfurized solvent in a gas desulfurization device, which belongs to the processing field of petroleum and natural gas. Mainly aiming at the characteristics of the hydrocarbons and the solid granules in the desulfurized solvent, the technology removes a large part of hydrocarbons and solid granules in the desulfurized solvent by a method of increasing a cyclone separator and a filter in front of a desulfurized solvent flash pot in the processing technique of the conventional gas desulfurization device so as to effectively reduce or avoid the desulfurized solvent foaming in a regenerating tower, reduce energy consumption and agent consumption and reclaim the part of hydrocarbon substances at the same time of providing protection for normal production of a desulfurized solvent purifying system and a downstream sulfur production device.

Description

technical field [0001] The invention belongs to the field of petroleum processing, and in particular relates to the improvement of the processing technology of a gas desulfurization device. Background technique [0002] In the secondary processing of sour crude oil in the field of petroleum processing, a considerable part of the sulfur in the crude oil is converted into hydrogen sulfide gas. When such sulfur-containing gas is used as petrochemical raw material or fuel, it will cause corrosion of chemical production equipment and pipelines, cause catalyst poisoning, and at the same time pollute the environment and endanger human health. In addition, hydrogen sulfide in the gas is also a raw material for the production of sulfur and sulfuric acid. Therefore, it is necessary to remove hydrogen sulfide from refinery gas, and then use it as a raw material or fuel for petrochemical production. [0003] Most refinery gas desulfurization devices in my country adopt the chemical ab...

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Problems solved by technology

[0012] 1. The desulfurization solvent turns black and foams: when the desulfurization solvent contains solid particles such as ferrous sulfide and hydrocarbon liquid, the color becomes black. In addition, when solid particles such as ferrous sulfide and hydrocarbon liquid exist at the same time, the desulfurization solvent ( Such as diethanolamine, etc.) foaming (mechanical products such as ferrous sulfide are the cause of foaming, and hydrocarbons are the actual foaming substances), thus affecting the normal operation of the desulfurization solvent regeneration tower;

[0013] 2. The hydrocarbon content in the acid gas at the top of the solvent regeneration tower exceeds the standard (the highest hydrocarbon content exceeds 10%), and the production of the downstream sulfur production device is abnormal: the calorific value of the acid gas is 3.54GJ / m 3 , while the calorific value of hydrocarbons is about twelve times the calorific value of acid gas, and the difference between the two is quite large. When the acid gas at the top of the tower containing higher concentration of hydrocarbons enters the downstream sulfur plant, it will make it difficult to control the temperature of the combustion furnace of the plant, and the conversion system Self-heating balance cannot be maintained, equipment is corroded, products are unqualified (the color of sulfur produced is black), and the device cannot be produced normally

[0014] 3. The acid gas takes away a large amount of hydrocarbons, and the processing loss of the enterprise increases: taking the sulfur production plant with an annual output of 40,000 tons of sulfur as an example, the concentration of hydrocarbons in the acid gas is 10% (weight), and the hydrocarbons taken away by the acid gas in one year are about 4000 tons

[0015] 4. After regeneration, the desulfurization solvent purification system cannot operate normally, and it is forced to replace a large number of desulfurization solvents or replace desulfurization solvents, which will easily cause environmental pollution and greatly increase the loss of desulfurization solvents

Since the liquid at the bottom of the regeneration tower has been in a disturbed state and the residence time is not enough, most of the hydrocarbons and solid particles with higher boiling points entering the bottom of the tower enter the desulfurization solvent purification system together with the desulfurization solvent after regeneration at the bottom of the tower. These hydrocarbons and solid particles The content of the desulfurization solvent greatly exceeds the adsorption capacity of the activated carbon adsorption filter, so that the filter cannot be put into use due to too frequent backwashing. The desulfurization solvent has been bypassed for a long time. Or replacement, resulting in an increase in agent consumption and environmental problems at the same time;

[0016] 5. Increase the energy consumption of the regeneration tower: some components with lower boiling points in the hydrocarbons entering the regeneration tower together with the desulfurization solvent circulate inside the regeneration tower system, which will increase the energy consumption of the regeneration tower

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