Detergent composition and method of regenerating inactivated denitrification catalyst

Abstract

The invention relates to the field of chemical industry and discloses a detergent composition and a method of regenerating an inactivated denitrification catalyst; the detergent composition comprises a surfactant, nitric acid, a heavy metal catching agent and an optional flocculant, wherein the weight ratio of the surfactant, the flocculant, the nitric acid and the heavy metal catching agent is (0.002-10):(0.1-50):(0.2-500):1. The detergent composition for removing mercury from the regenerated inactivated denitrification catalyst is more effective in removing heavy metals, such as mercury and arsenic, depositing in the inactivated denitrification catalyst, removing mercury and arsenic ions in post-washing washing solution, and precipitating in washing residue, thereby reducing water pollution.

Description

technical field

[0001] The invention relates to the field of chemical industry, in particular to a cleaning agent composition and a method for regenerating a deactivated denitrification catalyst. Background technique

[0002] Nitrogen oxides are one of the main pollutants in the atmosphere. Excessive discharge of nitrogen oxides is the main cause of acid rain, photochemical smog and the formation of PM2.5 in the air. my country's NO in 2013 X The emission was 22.74 million tons, reaching 24.13 million tons in 2014, an increase of 7.2%. Nitrogen oxides emitted from flue gas from coal-fired power plants are an important source of nitrogen oxides in the atmosphere. Since the publication of the "Emission Standards for Air Pollution from Thermal Power Plants" in early 2012, major domestic power plants have basically completed the transformation of nitrogen oxide emission reduction facilities. At present, the internationally accepted vanadium-tungsten-titanium SCR denitrificati...

Examples

specific Embodiment approach

[0049] According to a preferred specific implementation, the method for regenerating a deactivated denitration catalyst includes:

[0050] (1) pre-cleaning the deactivated denitration catalyst under bubbling;

[0051] (2) The deactivated denitration catalyst after pre-cleaning is first contacted with an aqueous solution of a cleaning agent composition containing a surfactant, nitric acid and a heavy metal scavenger, wherein, in the aqueous solution of the cleaning agent composition, the surface active agent, nitric acid and the weight ratio of the content of the heavy metal scavenger is 0.002-10:0.2-500:1; and the mixture obtained after the first contact is filtered and separated to obtain the catalyst obtained after the first contact and a cleaning solution, and adding a flocculant to the cleaning solution; then the obtained cleaning solution after flocculation and precipitation is used for circulation;

[0052] (3) carrying out second contacting with the catalyst obtained a...

Embodiment 1

[0073] Take deactivated denitrification catalyst monomer A1, a total of 150*150*600mm 3 , the measured mercury content is 345ppm, and the arsenic content is 1850ppm; the measured denitrification efficiency is 67.0%.

[0074]Preparation of cleaning agent composition B1: Inject 380kg of deionized water into the catalyst cleaning tank, and add penetrating agent JFC, defoamer GP330, 80% by weight of nitric acid and DTCR-1, the addition of the above-mentioned substances makes the cleaning agent combination The concentrations of penetrant JFC, defoamer GP330, nitric acid and DTCR in substance B1 were 0.01 wt%, 0.01 wt%, 1 wt% and 0.12 wt%, respectively.

[0075] Steps to regenerate deactivated denitrification catalyst:

[0076] (1) Place the deactivated denitration catalyst monomer A1 in a pre-wash tank containing water for bubbling pre-cleaning;

[0077] (2) Perform the first contact with the deactivated denitration catalyst after pre-cleaning and the cleaning agent composition B...

Embodiment 2

[0083] Take deactivated denitrification catalyst monomer A2, a total of 150*150*600mm 3 , the measured mercury content is 287ppm, and the arsenic content is 1730ppm; the measured denitrification efficiency is 67.2%.

[0084] Preparation of cleaning agent composition B2: Inject 380kg of deionized water into the catalyst cleaning tank, and add penetrating agent SF, polyethyleneimine, defoamer GP330, 80% by weight of nitric acid and DTCR-2, the addition of the above-mentioned substances The amounts are such that the concentrations of penetrant SF, polyethyleneimine, defoamer GP330, nitric acid and DTCR in cleaning agent composition B2 are 0.04 wt%, 0.03 wt%, 0.08 wt%, 1.2 wt% and 0.1 wt%, respectively.

[0085] Steps to regenerate deactivated denitrification catalyst:

[0086] (1) Place the deactivated denitration catalyst monomer A2 in a pre-wash tank containing water for bubbling pre-cleaning;

[0087] (2) Perform the first contact with the deactivated denitration catalyst af...

technical field

[0001] The invention relates to the field of chemical industry, in particular to a cleaning agent composition and a method for regenerating a deactivated denitrification catalyst. Background technique

[0002] Nitrogen oxides are one of the main pollutants in the atmosphere. Excessive discharge of nitrogen oxides is the main cause of acid rain, photochemical smog and the formation of PM2.5 in the air. my country's NO in 2013 X The emission was 22.74 million tons, reaching 24.13 million tons in 2014, an increase of 7.2%. Nitrogen oxides emitted from flue gas from coal-fired power plants are an important source of nitrogen oxides in the atmosphere. Since the publication of the "Emission Standards for Air Pollution from Thermal Power Plants" in early 2012, major domestic power plants have basically completed the transformation of nitrogen oxide emission reduction facilities. At present, the internationally accepted vanadium-tungsten-titanium SCR denitrificati...

Examples

specific Embodiment approach

[0049] According to a preferred specific implementation, the method for regenerating a deactivated denitration catalyst includes:

[0050] (1) pre-cleaning the deactivated denitration catalyst under bubbling;

[0051] (2) The deactivated denitration catalyst after pre-cleaning is first contacted with an aqueous solution of a cleaning agent composition containing a surfactant, nitric acid and a heavy metal scavenger, wherein, in the aqueous solution of the cleaning agent composition, the surface active agent, nitric acid and the weight ratio of the content of the heavy metal scavenger is 0.002-10:0.2-500:1; and the mixture obtained after the first contact is filtered and separated to obtain the catalyst obtained after the first contact and a cleaning solution, and adding a flocculant to the cleaning solution; then the obtained cleaning solution after flocculation and precipitation is used for circulation;

[0052] (3) carrying out second contacting with the catalyst obtained a...

Embodiment 1

[0073] Take deactivated denitrification catalyst monomer A1, a total of 150*150*600mm 3 , the measured mercury content is 345ppm, and the arsenic content is 1850ppm; the measured denitrification efficiency is 67.0%.

[0074]Preparation of cleaning agent composition B1: Inject 380kg of deionized water into the catalyst cleaning tank, and add penetrating agent JFC, defoamer GP330, 80% by weight of nitric acid and DTCR-1, the addition of the above-mentioned substances makes the cleaning agent combination The concentrations of penetrant JFC, defoamer GP330, nitric acid and DTCR in substance B1 were 0.01 wt%, 0.01 wt%, 1 wt% and 0.12 wt%, respectively.

[0075] Steps to regenerate deactivated denitrification catalyst:

[0076] (1) Place the deactivated denitration catalyst monomer A1 in a pre-wash tank containing water for bubbling pre-cleaning;

[0077] (2) Perform the first contact with the deactivated denitration catalyst after pre-cleaning and the cleaning agent composition B...

Embodiment 2

[0083] Take deactivated denitrification catalyst monomer A2, a total of 150*150*600mm 3 , the measured mercury content is 287ppm, and the arsenic content is 1730ppm; the measured denitrification efficiency is 67.2%.

[0084] Preparation of cleaning agent composition B2: Inject 380kg of deionized water into the catalyst cleaning tank, and add penetrating agent SF, polyethyleneimine, defoamer GP330, 80% by weight of nitric acid and DTCR-2, the addition of the above-mentioned substances The amounts are such that the concentrations of penetrant SF, polyethyleneimine, defoamer GP330, nitric acid and DTCR in cleaning agent composition B2 are 0.04 wt%, 0.03 wt%, 0.08 wt%, 1.2 wt% and 0.1 wt%, respectively.

[0085] Steps to regenerate deactivated denitrification catalyst:

[0086] (1) Place the deactivated denitration catalyst monomer A2 in a pre-wash tank containing water for bubbling pre-cleaning;

[0087] (2) Perform the first contact with the deactivated denitration catalyst af...