Alkali washing regenerating liquid for denitration catalyst and regenerating method

Abstract

The invention provides alkali washing regenerating liquid for a denitration catalyst and a regenerating method. The alkali washing regenerating liquid comprises the following components in permillage by weight: 1 to 5wt%o of surface active agent, 1 to 5wt%o of solubilizer, and the balance of sodium hydroxide solution, wherein the solubilizer is sodium xylene sulfonate. Compared with the prior art, the alkali washing regenerating liquid shows a good effect on regenerating the denitration catalyst poisoned from phosphorus, and the regenerated denitration catalyst is high in denitration efficiency; the experiment result shows that the regenerated denitration catalyst contains not greater than 0.12% of P2O5, and the denitration efficiency is more than 90%.

Description

technical field [0001] The invention relates to the technical field of catalyst regeneration, and more specifically relates to an alkaline cleaning regeneration solution and regeneration method for denitration catalysts. Background technique [0002] my country is a country with coal as the main energy source, and nitrogen oxides emitted after coal combustion is one of the main pollutants in the atmosphere, which is extremely harmful to the environment. Therefore, my country has strictly controlled the emission of nitrogen oxides. [0003] Selective Catalytic Reduction (hereinafter referred to as SCR) denitrification technology has a remarkable effect on the removal of nitrogen oxides, and is currently the most widely used flue gas denitrification technology. In the entire SCR denitrification system, the denitrification catalyst is the core component and accounts for a relatively large proportion of equipment investment. However, the denitrification performance of the denit...

AI Technical Summary

Problems solved by technology

For the denitration catalyst operating in the co-firing flue gas of coal and sludge with high phosphorus content, a large amount of P will be enriched on its surface 2 o 5 , resulting in a decrease in the specific surface area and void volume of the denitration catalyst, which has a serious impact on the denitration activity of the denitration catalyst

At present, the existing technology uses sodium hydroxide solution to carry out alkaline washing on the denitrification catalyst poisoned by phosphorus components, so as to realize the regeneration of the deactivated denitrification catalyst, but the denitrification activity of the regenerated denitrification catalyst is only 80%, which has not reached the level of the fresh catalyst