Denitrification catalyst is mainly used to reduce the emission of nitrogen oxides in the flue gas content, so as to achieve emission standards, reduce environmental pollution. In the above, “denitrification catalyst deactivated why recycling” refers to the use of denitration catalyst is large, and itself contains some heavy metals and other environmentally harmful substances, inactivated denitrification catalyst can not be directly discarded in the environment, it is necessary to For recycling, the following with us to see how the denitrification catalyst regeneration plant regeneration and denitrification catalyst for recycling.
There are 2 sample pretreatment degassing stations and 2 sample analysis stations. High test accuracy, good reproducibility. Repeatability error is less than ± 1%. Test range: 0.0005m2 / g or more than the surface, microporous: 0.35-2nm, mesopores: 2-50nm, large pores: 50-500nm, sample type: powder, granules, fibers and sheet materials can be loaded into the sample tube s material.
First, the regeneration analysis
The deactivation catalyst module obtained from the denitrator is analyzed and analyzed, and the deactivation reason is analyzed. According to the deactivation condition, the regeneration process plan is designed.
Second, the deactivation SCR catalyst pre-cleaning
(1) dusting the surface of the deactivated catalyst surface by physical methods;
② the module to be processed into the automatic cleaning tank, automatic high-pressure water spray, and then enter the artificial cleaning pool, the first manual cleaning to remove the catalyst pore block in the ash;
③ through automatic spraying and manual cleaning of the module identified, according to the catalyst module in the catalyst monomer can be recycled to determine the follow-up process.
Third, the depth of cleaning
① the depth of the module can be recycled clean, cleaned by a special cleaning solution, through the special cleaning fluid surfactant, emulsifier, chelating agent, penetrant and other ingredients will be blocked ash from the waste catalyst module to clean out the part of the ash And cleaning agents in combination with the active ingredient to form a precipitate, with the cleaning liquid cleaning wastewater discharge. And then manually re-cleaning to completely remove the catalyst surface ash block.
② ultrasonic cleaning, the catalyst for the obsolete pores in the catalyst for deep cleaning.
③ acid cleaning, the catalyst in the denitrification system running to maintain a certain acid position in order to make the catalyst and nitrogen oxides better reaction. The catalyst in the course of the process, because of potassium, sodium and other alkali metal poisoning, it is necessary to use a certain concentration of acid cleaning catalyst in order to completely remove the alkaline channels in the catalyst material to ensure that the catalyst acid meet the activity requirements.
Fourth, the active substance addition and drying calcination
After the deep cleaning catalyst cleaning module can completely remove impurities such as blocking ash. The active content of the catalyst module is adjusted by adding the active component solution to meet the SCR denitration system requirements. And then into the drying room, drying temperature control in a certain temperature conditions, the cleaning process to bring out water in the form of water vapor discharge.
Fifth, before the regeneration of technical characteristics
(1) chemical deep cleaning of the deactivated SCR catalyst under mild conditions to remove most of the poisoned ions in the catalyst;
(2) It can greatly reduce the damage or change of the microporous structure of the catalyst under the premise of cleaning the fine pore structure of the catalyst;
(3) According to the different reasons of deactivation of denitrification catalyst, through the corresponding regeneration process, tailor a reasonable means of regeneration, so that the catalyst activity of more than 90% of the new catalyst.
The regeneration of deactivated denitrification catalyst is a complex physical and chemical process. It adopts a combination of physical and chemical methods to remove the harmful elements such as arsenic, phosphorus and alkali metals through a series of physical and chemical reactions. The efficiency of the catalyst. Not only improve the utilization of resources, but also can only be abandoned for the catalyst can achieve zero pollution emissions, to avoid secondary pollution.