Regeneration method for honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst

Abstract

The invention discloses a regeneration method for a honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst, and belongs to the technical field of power environment protection. The regeneration method comprises the following steps: 1) dipping a poisoned honeycomb type SCR catalyst into a diluted sulfuric acid solution, carrying out ultrasonic treatment, then taking out and drying; 2) putting the honeycomb type SCR catalyst treated in the step 1 into a cerous nitrate solution, dipping for 1-3 hours and then taking out; 3) roasting the honeycomb type SCR catalyst treated in the step 2, raising the temperature to be 110 DEG C at the speed of no greater than 3 DEG C / min, subsequently preserving the temperature for 3-5 hours, furthermore, raising the temperature to be 300 DEG C at the speed of no greater than 3 DEG C / min, and preserving the temperature for 8-10 hours to obtain the regenerated honeycomb type SCR denitration catalyst. The active precusor substance cerous nitrate used in the regeneration method is wide in source and good in solvability; the activity of the catalyst subjected to regeneration treatment can be recovered to be more than 80% as compared with the activity of the catalyst which is not poisoned; meanwhile, the regeneration process is simplified, the regeneration cost is lowered, and the regeneration method is simple and convenient to operate, environment-friendly and applicable to large-scale industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of electric power environmental protection, and relates to a regeneration method of a denitration catalyst, in particular to a regeneration method of a honeycomb SCR denitration catalyst. Background technique [0002] Nitrogen oxide (NOx) emission control of coal-fired power plants is a key task in the field of energy conservation and environmental protection during the country's "Twelfth Five-Year Plan". The most stringent control standard (100mg / m3) in the world has been formulated. With the promulgation of these national policies, how to effectively control NOx emissions has become one of the important issues to be solved in the field of power environmental protection. [0003] At present, the flue gas denitrification (DeNOx) of coal-fired power stations mainly adopts the selective catalytic reduction (SCR) technology, which uses ammonia as the reducing agent and uses the SCR catalyst to reduce the NOx i...

AI Technical Summary

Problems solved by technology

Although the above regeneration idea can effectively restore the denitrification activity of the poisoned catalyst, there are the following problems in engineering application: the solubility of the commonly used active substance precursor ammonium metavanadate in water is very small (5g / L, 20℃), so it is very difficult to It is difficult to adjust the loading amount (supplementary amount) on the SCR catalyst by controlling the concentration of the solution, but it can only be adjusted by repeated "dipping-drying" process, which has been reported in patent CN101574671 and patent CN102114422, which not only increases The process operation is cumbersome and increases the cost of regeneration; at the same time, another commonly used active material precursor, ammonium metatungstate, has a high price and is the main factor affecting the production cost of SCR catalysts. If it is used in catalyst regeneration, it will increase high regeneration cost

In short, the above problems can lead to high catalyst regeneration costs, which is not conducive to the engineering application of regeneration technology