Arsenic-poisoned denitration catalyst regeneration liquid and application

Abstract

The invention discloses arsenic-poisoned denitration catalyst regeneration liquid and an application. The arsenic-poisoned denitration catalyst regeneration liquid is composed of cleaning liquid and active supplementary liquid, wherein the cleaning liquid comprises tetramethylammonium hydroxide, hydrogen peroxide, an osmotic agent SF and the balance water; the active supplementary liquid comprises vanadyl sulfate and the balance water; the cleaning liquid comprises 0.01 to 1.00% of the osmotic agent SF and 0.01 to 0.05% of hydrogen peroxide; a preparation method for the cleaning liquid is as follows: subjecting the osmotic agent, hydrogen peroxide and the water to mixing under stirring in proportion so as to obtain a solution, and adjusting the pH value of the solution to 9.0 to 10.5 with tetramethylammonium hydroxide; and the concentration of vanadyl sulfate in the active supplementary liquid is 0.2 to 0.8 mol / L. The regeneration liquid provided by the invention is used for regeneration of an arsenic-poisoned denitration catalyst. According to the invention, the activity of a deactivated catalyst is significantly improved; the catalytic activity of the regenerated catalyst is extremely close to the catalytic activity of a fresh catalyst; meanwhile, the compressive strength and the wear rate of a catalyst may not be reduced; and the requirements of a denitration project in a coal-fired power plant are met.

Description

technical field [0001] The invention belongs to the field of catalysts for coal-fired power plants, and in particular relates to a regeneration solution for arsenic poisoning denitrification catalysts and a catalyst regeneration method. Background technique [0002] NO in coal flue gas x Excessive emissions will cause acid rain, photochemical smog, ozone depletion and greenhouse effect, posing a great threat to the natural environment and human health. Take NH 3 Reduction of NO by Selective Catalyst as Reductant x It is the most widely used and mature technology at present. [0003] The arsenic content in coal in some areas of my country can be as high as 40-60mg / Kg, especially in the northeast and Inner Mongolia, the denitrification catalysts are prone to arsenic poisoning, such as the Huolinhe pit mouth project, the As in the catalyst 2 o 3 The content is as high as 2.5% (XRF test results), the catalytic activity of the catalyst is severely reduced, and the denitrific...

AI Technical Summary

Problems solved by technology

[0003] The arsenic content in coal in some areas of my country can be as high as 40-60mg / Kg, especially in the northeast and Inner Mongolia, the denitrification catalysts are prone to arsenic poisoning, such as the Huolinhe pit mouth project, the As in the catalyst 2 o 3 The content is as high as 2.5% (XRF test results), the catalytic activity of the catalyst is severely reduced, and the denitrification activity is reduced to 40-50% of the activity of the fresh catalyst. The poisoned catalyst can no longer meet the denitrification requirements of coal-fired power stations

Images