SCR (selective catalytic reduction) flue gas denitration catalyst regeneration method

Abstract

The invention relates to a catalyst regeneration method, and especially relates to an SCR flue gas denitration catalyst regeneration method. The method concretely comprises the following steps: purging a catalyst to be regenerated; putting the catalyst into a cleaning pool, cleaning with a cleaning solution, and drying; dipping the cleaned catalyst into an activity supplement solution to carry out activity supplement, and drying; and roasting and cooling the dried catalyst to obtain a generated denitration catalyst. The method of the invention has the following beneficial effects: catalyst carriers are not destroyed during cleaning; the catalyst can be cleaned, active substances can be supplemented, and active components of the regenerated catalyst are environmentally-friendly, so the regenerated catalyst does not generate pollution in the use process; and the denitration activity of the regenerated catalyst reaches above 90%. The method is very important for regeneration and reuse of dead toxic vanadium-titanium catalysts, and use promotion of self-developed novel environmentally-friendly and cheap titanium-based denitration catalysts.

Description

technical field [0001] The invention relates to a catalyst regeneration method, in particular to a catalyst regeneration method for SCR flue gas denitrification. Background technique [0002] Denitrification refers to the removal of nitrogen oxides (NOx). my country's NOx emissions in 2010 were as high as 22.73 million tons, making it the world's largest emitter. NOx is the main cause of acid rain, and the loss caused by acid rain pollution in my country exceeds 300 billion yuan every year. Among many denitrification methods, selective catalytic reduction (SCR) has a high denitrification rate (>90%), mature technology, and no harmful products. It has become the main method of NOx treatment at home and abroad (accounting for 96%). In the SCR system, the catalyst is the core, usually accounting for 30%-50% of the initial investment. Since the flue gas contains K, Na, As and other oxides and fly ash, it is easy to poison and block the catalyst, which will cause the cata...

AI Technical Summary

Problems solved by technology

Both patents are based on the regeneration of vanadium-titanium catalysts. V2O5 is a highly toxic substance. Not only will it cause serious pollution during production and use, but the regenerated vanadium-titanium catalysts will still continue to pollute the environment.