Regeneration method of SCR (selective catalytic reduction) catalyst

Abstract

The invention discloses a regeneration method of an SCR (selective catalytic reduction) catalyst. According to the method, the catalyst is cleaned through two steps and is loaded with active components after complete cleaning, blocking materials are more thoroughly cleaned, and the active components are more uniformly loaded. An adopted cleaning fluid formula belongs to a low-toxic or even non-toxic material, so that environmental pollution is reduced; a weak acidic or weak basic solution is adopted, and loss of the active components in the catalyst is avoided in a cleaning process, and the method further has the characteristics of high pertinence and high efficiency. The activity of the catalyst cleaned in a separated manner recovers to higher than 95% of the activity of a fresh catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, and in particular relates to a regeneration method of an SCR catalyst. Background technique [0002] On July 29, 2011, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine jointly issued a new national emission standard GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants", requiring the thermal power industry to increase investment in environmental protection. According to estimates, during the 12th Five-Year Plan period, the capacity of existing units and new units that need to be modified to remove nitrogen oxides is about 817 million kilowatts, which will bring a huge catalyst market. Catalysts are dusty arrangements and fail due to micropore clogging during long-term operation. If the catalyst is directly replaced with a fresh catalyst, the cost will increase greatly, and the catalyst re...

AI Technical Summary

Problems solved by technology

[0007] The publication number is CN103878035A, and the Chinese invention patent titled "a regeneration liquid for a vanadium and titanium-based selective catalytic reduction denitrification catalyst" discloses that the cleaning liquid has a good effect on the treatment of catalysts poisoned by alkaline earth metals and iron salts. effect, but its cleaning solution is alkaline, from the principle of analysis, its cleaning effect on alkaline and alkaline earth metals is not good, although the active replenishment solution contains acidic substances, it can clean part of alkali metals and alkaline earth metals, play a role Certain effects, but still the same as other existing technologies, cleaning and loading are completed in one step, which is not conducive to the uniform loading of active components, which in turn affects the activity recovery of the catalyst