Preparation process of honeycomb catalyst for coal-fired flue gas denitration in thermal power plant as well as product and application of preparation process

A technology of honeycomb catalyst and denitrification catalyst, which is applied in the field of nitrogen oxide catalytic reduction materials, which can solve the problems of high mechanical strength, low content of active ingredients, and low catalytic activity, and achieve high compressive strength, not easy to crack, and high strength.

Inactive Publication Date: 2018-12-21
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitration catalyst has high mechanical strength, but the coating method results in less active ingredient content and lower catalytic activity

Method used

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  • Preparation process of honeycomb catalyst for coal-fired flue gas denitration in thermal power plant as well as product and application of preparation process
  • Preparation process of honeycomb catalyst for coal-fired flue gas denitration in thermal power plant as well as product and application of preparation process
  • Preparation process of honeycomb catalyst for coal-fired flue gas denitration in thermal power plant as well as product and application of preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] figure 1 The schematic diagram of the process flow for the preparation of the denitration catalyst, the preparation method according to the process flow is as follows:

[0056] Weigh 4.84kg of titanium dioxide, 0.6kg of tungsten trioxide, 0.11kg of molybdenum trioxide, and 0.21kg of vanadium pentoxide, and mix them evenly.

[0057] Weigh 0.44kg of 1cm high-strength glass fiber chopped strands (strength 8.5GPa, modulus 90GPa), add 0.57kg polyvinyl alcohol to modify it.

[0058] The above materials were mixed, and 0.44kg of clay, 0.07kg of carbon black, 0.24kg of 25% industrial grade ammonia water, 0.41kg of ethanol and 2.07kg of water were added, and fully stirred in a mixer.

[0059] Put the fully stirred mud into a kneader for kneading; then filter and pre-extrude in a pre-extruder equipped with a filter screen with a mesh size of 2mm; put the pre-extruded material into a vacuum extruder , extruded through the mold as a whole, and cut into segments according to the s...

Embodiment 2

[0064] Weigh 5.50kg titanium dioxide, 0.11kg tungsten trioxide, 0.10kg molybdenum trioxide, 0.15kg vanadium pentoxide,

[0065] 0.54kg of 1.5cm high-strength glass fiber chopped strands (strength 8.5GPa, modulus 90GPa), add 0.48kg polyvinyl alcohol to modify it.

[0066] The above materials were mixed, and 0.65kg of clay, 0.36kg of carbon black, 0.24kg of 25% industrial grade ammonia water, 0.47kg of ethanol and 2.03kg of water were added, and fully stirred in a mixer.

[0067] Put the fully stirred mud into a kneader for kneading; then filter and pre-extrude in a pre-extruder equipped with a filter screen with a mesh size of 1.5mm; put the pre-extruded material into a vacuum extruder In the process, it is extruded as a whole through a mold and cut into segments according to the specified length.

[0068] After cutting, the wet billet is dried once. The primary drying conditions are: drying temperature 45°C, drying humidity 50%, drying time 72 hours.

[0069] The wet billet...

Embodiment 3

[0074] Weigh 5.9kg of titanium dioxide, 0.21kg of molybdenum trioxide, and 0.05kg of vanadium pentoxide, and mix them evenly.

[0075] Weigh 0.54kg of 1.5cm high-strength glass fiber chopped strands (strength 8.5GPa, modulus 90GPa), and add 0.27kg of polyvinyl alcohol to modify it.

[0076] Mix the above materials, add 0.35kg clay, 0.1kg cornstarch, 0.24kg 25% industrial grade ammonia water, 0.37kg acetone and 1.97kg water and mix them well in a mixer.

[0077] Put the fully stirred mud into a kneader for kneading; then filter and pre-extrude in a pre-extruder equipped with a filter screen with a mesh size of 0.5mm; put the pre-extruded material into a vacuum extruder In the process, it is extruded as a whole through a mold and cut into segments according to the specified length.

[0078] After cutting, the wet billet is dried once. The primary drying conditions are: drying temperature 40°C, drying humidity 50%, and drying time 48 hours.

[0079] The wet billet after primar...

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Abstract

The invention discloses a preparation process of a honeycomb catalyst for coal-fired flue gas denitration in a thermal power plant as well as the product and application of the preparation process. According to the preparation process, TiO2, WO3, a catalytic addictive and V2O5 are taken as effective components, glass fibers, an organic binding agent, an inorganic binding agent, a pore-forming agent, a neutralizer and a solvent are added, and the honeycomb catalyst is prepared by mixing, kneading, carrying out extrusion molding, drying and firing. According to the preparation process, a wet green body is obtaining by adding the binding agents for modifying the glass fibers, adding the specific catalytic addictive, sequentially adding the other additives, adding a filter screen with a specific specification for filtering strips, carrying out extrusion molding and evenly mixing; the wet green body is treated by a drying process for twice, so that the large-size wet green body is enabled to be uniformly dried and does not easily crack; finally, the honeycomb catalyst is obtained by calcining. The honeycomb catalyst is high in compression strength, and the catalytic denitration rate ofthe honeycomb catalyst is greater than 80%.

Description

technical field [0001] The invention relates to a preparation process of a honeycomb catalyst used for denitrification of coal-fired flue gas in a thermal power plant, its product and application, and belongs to the technical field of nitrogen oxide catalytic reduction materials. Background technique [0002] On July 29, 2011, the Ministry of Environmental Protection issued the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011). The new standards set stricter regulations on the emission limits of the three main pollutants, smoke, sulfur dioxide and nitrogen oxides. In terms of denitrification, the new standard stipulates that starting from July 1, 2014, except for the use of W-type flame furnaces and existing circulating fluidized bed thermal power boilers, and the completion and commissioning of construction projects before December 31, 2003 or through the environmental impact report of construction projects For thermal power boilers approved by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/888B01J37/08B01J35/04B01J35/06B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J23/8885B01J35/04B01J35/06B01J37/0018B01J37/088B01J2523/00B01J2523/47B01J2523/55B01J2523/68B01J2523/69B01J2523/845
Inventor 何丹农徐荣赵昆峰杨玲袁静蔡婷金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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