Ultrasonic pickling regeneration method for waste flue gas denitration catalyst

Abstract

The invention relates to the technical field of waste catalyst recycling, in particular to an ultrasonic pickling regeneration method for a waste flue gas denitration catalyst. The ultrasonic pickling regeneration method comprises the following steps: (1) dust collection: blowing and cleaning dust on the surface of an inactivated catalyst sample; (2) washing: after the sample is subjected to the dust collection, soaking the sample into ionized water for ultrasonic washing through an ultrasonic generator; (3) acid pickling: after the sample is washed, putting the sample into a mixed acid solution consisting of fatty alcohol-polyoxyethylene ether, polyethylene glycol fatty acid ester and sulfuric acid, and performing ultrasonic acid pickling through the ultrasonic generator; (4) drying: putting the sample subjected to the acid pickling into a vacuum drying box for drying to obtain a regenerated catalyst. Compared with the conventional waste flue gas denitration catalyst regeneration technology, the ultrasonic pickling regeneration method disclosed by the invention has the advantages that the problem of inactivation of the catalyst due to blockage and poisoning can be solved at one time; furthermore, the cleaning step is eliminated, the loss of the activity of the catalyst is reduced, and the water pollution is alleviated.

Description

technical field

[0001] The invention relates to the technical field of recovery of waste catalysts, in particular to an ultrasonic pickling regeneration method for waste flue gas denitrification catalysts. Background technique

[0002] Selective catalytic reduction (SCR) is the most important denitrification technology for coal-fired power plants in my country at present. The catalyst is an important part of the SCR system, and its performance directly affects the denitrification efficiency of the SCR system. At present, SCR catalysts are mainly honeycomb type, flat type and corrugated plate type, and the main component is TiO 2 , V 2 o 5 、WO 3 、MoO 3 . At present, the flue gas denitrification projects of coal-fired power plants in my country adopt high-temperature and high-dust arrangements. During the use of waste flue gas denitrification catalysts, due to the continuous erosion of dust in the flue gas, the micropores of the catalysts will be blocked or alkali metals,...

Examples

Embodiment 1

[0021] refer to figure 1 , Take the deactivated catalyst sample without pickling, conduct scanning electron microscope test, magnify 3500 times, observe the surface morphology of deactivated catalyst sample.

Embodiment 2

[0023] refer to figure 2 , take the deactivated catalyst, randomly cut into 20g small samples, blow soot and remove dust, and remove dust and impurities on the surface of the sample;

[0024] Place the sample in 500mL deionized water solution, put it in an ultrasonic generator with a power of 3kw, and wash it ultrasonically for 20 minutes;

[0025] Prepare 500 mL of mixed acid solution, wherein the mass fraction of fatty alcohol polyoxyethylene ether is 0.03 wt%, the mass fraction of polyethylene glycol fatty acid ester is 0.03 wt%, and the concentration of sulfuric acid is 0.1 mol / L;

[0026] Submerge the water-washed catalyst sample in the mixed acid solution for ultrasonic pickling for 25 minutes, and the power of the ultrasonic generator is 2kw;

[0027] The acid-washed catalyst was dried in a vacuum oven at 120°C for 3 hours to obtain a regenerated catalyst;

[0028] The samples were taken for scanning electron microscope test to observe the surface morphology of the c...

Embodiment 3

[0030] refer to image 3 , take the deactivated catalyst, randomly cut into 25g small samples, blow soot and remove dust, and remove dust and impurities on the surface of the sample;

[0031] Place the sample in 500mL deionized water solution, put it in an ultrasonic generator with a power of 1kw, and wash it ultrasonically for 40 minutes;

[0032] Prepare 500 mL of mixed acid solution, wherein the mass fraction of fatty alcohol polyoxyethylene ether is 0.01 wt%, the mass fraction of polyethylene glycol fatty acid ester is 0.05 wt%, and the concentration of sulfuric acid is 0.5 mol / L;

[0033] Submerge the water-washed catalyst sample in the mixed acid solution for ultrasonic pickling for 20 minutes, and the power of the ultrasonic generator is 5kw;

[0034] The acid-washed catalyst was dried in a vacuum oven at 100°C for 8 hours to obtain a regenerated catalyst;

[0035] The samples were taken for scanning electron microscope test to observe the surface morphology of the ca...

technical field

[0001] The invention relates to the technical field of recovery of waste catalysts, in particular to an ultrasonic pickling regeneration method for waste flue gas denitrification catalysts. Background technique

[0002] Selective catalytic reduction (SCR) is the most important denitrification technology for coal-fired power plants in my country at present. The catalyst is an important part of the SCR system, and its performance directly affects the denitrification efficiency of the SCR system. At present, SCR catalysts are mainly honeycomb type, flat type and corrugated plate type, and the main component is TiO 2 , V 2 o 5 、WO 3 、MoO 3 . At present, the flue gas denitrification projects of coal-fired power plants in my country adopt high-temperature and high-dust arrangements. During the use of waste flue gas denitrification catalysts, due to the continuous erosion of dust in the flue gas, the micropores of the catalysts will be blocked or alkali metals,...

Examples

Embodiment 1

[0021] refer to figure 1 , Take the deactivated catalyst sample without pickling, conduct scanning electron microscope test, magnify 3500 times, observe the surface morphology of deactivated catalyst sample.

Embodiment 2

[0023] refer to figure 2 , take the deactivated catalyst, randomly cut into 20g small samples, blow soot and remove dust, and remove dust and impurities on the surface of the sample;

[0024] Place the sample in 500mL deionized water solution, put it in an ultrasonic generator with a power of 3kw, and wash it ultrasonically for 20 minutes;

[0025] Prepare 500 mL of mixed acid solution, wherein the mass fraction of fatty alcohol polyoxyethylene ether is 0.03 wt%, the mass fraction of polyethylene glycol fatty acid ester is 0.03 wt%, and the concentration of sulfuric acid is 0.1 mol / L;

[0026] Submerge the water-washed catalyst sample in the mixed acid solution for ultrasonic pickling for 25 minutes, and the power of the ultrasonic generator is 2kw;

[0027] The acid-washed catalyst was dried in a vacuum oven at 120°C for 3 hours to obtain a regenerated catalyst;

[0028] The samples were taken for scanning electron microscope test to observe the surface morphology of the c...

Embodiment 3

[0030] refer to image 3 , take the deactivated catalyst, randomly cut into 25g small samples, blow soot and remove dust, and remove dust and impurities on the surface of the sample;

[0031] Place the sample in 500mL deionized water solution, put it in an ultrasonic generator with a power of 1kw, and wash it ultrasonically for 40 minutes;

[0032] Prepare 500 mL of mixed acid solution, wherein the mass fraction of fatty alcohol polyoxyethylene ether is 0.01 wt%, the mass fraction of polyethylene glycol fatty acid ester is 0.05 wt%, and the concentration of sulfuric acid is 0.5 mol / L;

[0033] Submerge the water-washed catalyst sample in the mixed acid solution for ultrasonic pickling for 20 minutes, and the power of the ultrasonic generator is 5kw;

[0034] The acid-washed catalyst was dried in a vacuum oven at 100°C for 8 hours to obtain a regenerated catalyst;

[0035] The samples were taken for scanning electron microscope test to observe the surface morphology of the ca...

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