Method for cleaning and regenerating SCR denitration catalyst for potassium and sodium poisoning deactivation

Abstract

The invention discloses a method for cleaning and regenerating an SCR denitration catalyst for potassium and sodium poisoning deactivation. The method comprises the following steps: preparing a cleaning solution and a regenerating solution, performing ash removal treatment on an SCR denitration catalyst subjected to potassium and sodium poisoning deactivation, adding the deactivated SCR denitration catalyst subjected to ash removal treatment into the cleaning solution for bubbling, performing ultrasonic cleaning, drying, bubbling and cleaning in the regenerating solution, supplementing vanadium components of the deactivated SCR denitration catalyst lost in the cleaning process, drying, calcining, and cooling to room temperature, thereby obtaining the regenerated denitration catalyst. According to the regeneration method disclosed by the invention, potassium and sodium poisoning elements of the deactivation catalyst can be effectively cleaned, and the porous structure of the catalyst is restored. Meanwhile, iron ions and arsenic and mercury ions in the deactivation catalyst can be effectively cleaned, the activity of the deactivated SCR denitration catalyst is effectively restored, the compressive strength and wear strength of the SCR denitration catalyst are improved to a certain degree, and the reusing requirement is met.

Description

technical field [0001] The invention relates to the technical field of deactivated selective catalytic reduction (SCR) denitration catalyst regeneration, in particular to a method for cleaning and regenerating an SCR denitration catalyst deactivated by potassium and sodium poisoning. Background technique [0002] Nitrogen oxides (NOx) are currently one of the most serious air pollutants in China. They are one of the main causes of photoacid rain, chemical smog and smog. They have a huge impact on industrial and agricultural production, traffic operations, human health and the ecological environment. hazards. Ammonia Selective Catalytic Reduction (SCR) is one of the effective ways to reduce NOx emissions. Its denitrification principle uses ammonia as a reducing agent to selectively reduce nitrogen monoxide and nitrogen dioxide into pollution-free nitrogen and water. [0003] At present, vanadium tungsten (molybdenum) titanium catalyst is the most widely used commercially and...

AI Technical Summary

Problems solved by technology

Although the catalyst has high activity and anti-sulfur and water resistance at this position, the dust concentration in the flue gas where it is located is high, and the concentration of potassium salt and sodium salt is high, which makes the catalyst easy to wear, easy to block, easy to Under poisoning conditions, the life of the catalyst is only 3-4 years. After 2016, there will be at least 150,000 cubic meters of waste per year. If it is not recycled, it will bring serious resource waste and environmental protection problems.

[0004] In addition, during the operation of SCR denitrification catalyst in biomass power plants, the flue gas contains a large amount of potassium salt and sodium salt, which greatly shortens the service life of the catalyst and increases the operating cost