Regenerated liquid of vanadium and titanium-based selective catalytic reduction (SCR) denitration catalyst

Abstract

The invention discloses a regenerated liquid of a vanadium and titanium-based selective catalytic reduction (SCR) denitration catalyst. The regenerated liquid comprises a cleaning liquid and an active replenishing liquid, wherein the cleaning liquid consists of alkaline organic salt, a surfactant and deionized water; the active replenishing liquid consists of weak acid, ammonium metavanadate, ammonium tungstate, cerous nitrate and deionized water. The cleaning liquid ingredient in the denitration catalyst regenerated liquid provided by the invention can eliminate adverse effects of harmful substances to the SCR denitration catalyst, and recover the pore pathway structure; the active replenishing liquid ingredient can improve the activity of the denitration catalyst, increase the thermal stability of the catalyst, and prolong the service life of the catalyst; the denitration ratio of the regenerated catalyst can reach 82%-90%; the SO2 / SO3 conversion rate is less than 1%; the service life of the regenerated liquid is mo than 85% of that of a fresh catalyst.

Description

technical field [0001] The invention relates to the field of selective catalytic reduction and denitrification catalysts, in particular to a regeneration solution for deactivated vanadium and titanium-based selective catalytic reduction and denitrification catalysts. Background technique [0002] As the country's control of nitrogen oxide emissions becomes more and more stringent, selective catalytic reduction (SCR) flue gas denitration technology is widely used in the denitrification system of thermal power plants because of its efficient and reliable denitrification performance. The technical core of the SCR flue gas denitrification process is vanadium and titanium-based catalysts, and there is a problem of activity decline during operation. There are many reasons for catalyst deactivation, including the influence of operating conditions, such as dust in the flue gas and temperature fluctuations that will damage the macrostructure of the catalyst, and various toxic and har...

AI Technical Summary

Problems solved by technology

The Chinese invention patent application with publication number CN102974366 mentions the mode of alkali washing and active liquid replenishment, but its alkali washing is carried out by using ammonia water, the effect is relatively single, the treatment efficiency is low, and it is easy to pollute the environment; its active replenishment adopts the method of coating form, it is difficult to play a lasting role in the process of flue gas denitrification

The Chinese invention patent application with the publication number CN102764675 also uses a weak acid and a surfactant to regenerate the deactivated catalyst. This regeneration solution is not effective in treating catalysts poisoned by acidic substances such as arsenic and phosphorus; the added EDTA can It produces complexation with alkaline earth metals, but its dispersibility is relatively poor, and it needs to add a certain dispersant before it can be used

In short, the above problems indicate that the performance of the existing vanadium and titanium-based SCR denitrification catalyst regeneration solution needs to be improved to more thoroughly remove all substances that cause deactivation, while retaining active components and strength, suitable for large-scale industrial production, and Can prevent environmental pollution