Regeneration flue gas desulfurization and absorption liquid circulation treating process

Abstract

The invention provides a regeneration flue gas desulfurization and absorption liquid circulation treating process which comprises the steps that regeneration glue gas enters an absorbing tower after being cooled, and is in countercurrent contact with a sprayed absorbing liquid for being desulfurized, desulfurized flue gas is exhausted to a chimney after being subjected to dust removal and mist removal; the desulfurized absorbing liquid is discharged into a neutralizing tank, lime milk slurry is added in the neutralizing tank to ensure that the absorbing liquid is regenerated; a regenerated mixed solution is conveyed to a thickener, a clarified overflow liquid overflows to a regeneration liquid tank, a thickened bottom current liquid flows in an intermediate tank; a liquid in the intermediate tank is conveyed to a plate-and-frame filter press through a filter-press pump for being filter-pressed, a filter cake is exhausted, a filtrate flows to a regeneration liquid tank; lost soda is replenished into the regeneration liquid tank, and a liquid in the regeneration liquid tank is conveyed back to a liquid storage section at the bottom of the absorbing tower. According to the regeneration flue gas desulfurization and absorption liquid circulation treating process provided by the invention, the desulfurization and the dust removal are performed by adopting a sodium and calcium double-alkali method, and thus the mission of microfine dust to the atmosphere is reduced and the accumulation of catalyst dust in the absorbing liquid is prevented; the regeneration flue gas desulfurization and absorption liquid circulation treating process has the characteristics of reliable performance, high equipment efficiency, energy saving, environment friendliness, and low cost.

Description

technical field [0001] The invention relates to a kind of desulfurization of non-coal-fired boiler flue gas, so that SO in the atmosphere can be discharged 2 And fine particle dust up to the standard, and the circulation treatment process of the absorption liquid after desulfurization, belong to the field of environmental chemical technology. Background technique [0002] Catalytic cracking is an important device in a refinery. Under the action of a catalyst, heavy oil is converted into light distillates such as gasoline, kerosene, and diesel oil. After the catalyst undergoes cracking reactions, there are carbon deposits on the surface. For this reason, the fluidized bed regeneration reactor In the process, air is used to burn off the carbon on the surface of the catalyst to restore the activity of the catalyst. Catalyst regenerated flue gas is different from coal-fired boiler flue gas. It has the following characteristics: (1) The temperature of the regenerated flue gas is...

AI Technical Summary

Problems solved by technology

[0005] (1) The accumulation of fine particles in the absorption liquid affects the operation of desulfurization;

[0006] (2) Larger catalyst particles are deposited in the equipment and blockage occurs;

[0007] (3) The hardness of catalyst dust is high, and the wear and tear of equipment and pumps is serious

[0024] (1) The neutralization regeneration reaction is a liquid-solid phase reaction, as can be seen from formulas (4) to (7), the reaction is complex, so a certain residence time is required;

[0025] (2) Calcium sulfite (CaSO 3 .1 / 2H 2 O) The particles are about 8-15 μm, so the precipitation speed is slow, and the precipitation efficiency needs to be improved;

The discharge of absorption liquid will not only cause secondary pollution, but also increase the operating cost of sodium-calcium double-alkali desulfurization

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