SCR flue gas denitration catalyst regeneration liquid and preparation method thereof

Abstract

The invention relates to an SCR flue gas denitration catalyst regeneration liquid and a preparation method thereof, the regeneration liquid comprises an activity recovery liquid, an antitoxic inhibition liquid and a cleaning liquid, and the weight ratio of the activity recovery liquid to the antitoxic inhibition liquid to the cleaning liquid is 1: 0.3: 5; wherein the activity recovery liquid is prepared from vanadyl acetate, ammonium metatungstate, cerium oxalate, lanthanum nitrate, a surface penetrating agent and deionized water; wherein the antitoxic inhibition liquid is prepared from ammonium tungstate pentahydrate, cesium nitrate, ceric ammonium sulfate and deionized water; the cleaning liquid is composed of acid, a surfactant, a dispersing agent and deionized water. The regeneration liquid provided by the invention can be used for regenerating the deactivated catalyst, has the advantages of good regeneration effect, low SO2 / SO3 conversion rate and the like, and the regenerated catalyst has better anti-toxic performance, so that the service life of the regenerated catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of environmental protection catalysts, in particular to an SCR flue gas denitrification catalyst regeneration solution and a preparation method thereof. Background technique [0002] With the increasingly strict control of nitrogen oxide emissions, the SCR denitrification process has been more and more widely used as the most effective denitrification method. Catalyst is the core of the process. The cost of catalyst accounts for about 20% of the initial construction cost of the SCR system. During operation, the cost of catalyst replacement accounts for about 50% of the total system price. In actual operation, industrial catalysts will gradually age and fail over time, so the life of the catalyst determines the cost of the SCR system, and the catalyst replaced due to the decline in activity contains vanadium pentoxide, heavy metals and other substances. It is a hazardous substance and must be recycled. And ...

AI Technical Summary

Problems solved by technology

The above scheme restores the catalyst activity through the regeneration solution, but there are still deficiencies: although the scheme supplements the active components V, W, and Mo required by the catalyst, the catalyst activity is restored to a certain extent, but the supplemented active components are unevenly dispersed. It is very easy to be poisoned and deactivated, which shortens the service life of the catalyst, and this plan does not improve the anti-poisoning ability of the catalyst accordingly, which leads to the fact that the regenerated catalyst is very easy to be poisoned and deactivated during use, reducing the use of the catalyst after regeneration life