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Preparation method for high-temperature flue gas denitrification catalyst and product of high-temperature flue gas denitrification catalyst

A denitrification catalyst and high-temperature flue gas technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy cracking of green bodies, high energy consumption, and long drying time

Inactive Publication Date: 2015-11-25
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The extruded catalyst body is dried to remove most of the excess water, and then transferred to the mesh belt kiln for roasting. The steam drying process commonly used in the industry needs to be carried out at a relatively low temperature of 60 ° C to 80 ° C for 10 days Left and right drying for a long time to ensure that the diffusion rate of moisture inside the green body is the same as the evaporation rate of water on the surface, so as to prevent the uneven shrinkage of the inner and outer layers from easily causing the cracking of the green body, so there is a long drying time and high energy consumption , uneven heating, easy cracking of the green body and other disadvantages

Method used

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  • Preparation method for high-temperature flue gas denitrification catalyst and product of high-temperature flue gas denitrification catalyst
  • Preparation method for high-temperature flue gas denitrification catalyst and product of high-temperature flue gas denitrification catalyst
  • Preparation method for high-temperature flue gas denitrification catalyst and product of high-temperature flue gas denitrification catalyst

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preparation example Construction

[0027] Such as figure 1 As shown, the present invention provides a method for preparing a high-temperature flue gas denitrification catalyst, comprising the following steps,

[0028] Step 1, precursor preparation, according to the following parts by weight:

[0029]

[0030] Mix, heat and stir to 80°C-100°C, keep warm for 6min-60min until all the solids are dissolved, and complete the preparation of the precursor;

[0031] Step 2, catalyst preparation,

[0032] According to the following quality scores:

[0033]

[0034] Mixing is carried out to obtain uniformly mixed mud, in which titanium tungsten powder is used as a carrier, and the function is to support the active components in the catalyst, and the TiO in titanium tungsten powder 2 Anatase type, WO 3 The content is 2% to 8%, and the specific surface area is 85m 2 / g~95m 2 / g, and then through extrusion molding, drying to remove water, and roasting, the preparation of the catalyst is completed.

[0035] In th...

Embodiment 1

[0040] Step 1, weigh 13.4kg ammonium metavanadate, 15.6kg ammonium heptamolybdate, 6.6kg niobium oxalate, 15kg monoethanolamine, mix with 80kg deionized water, heat and stir to 90°C, keep warm for 30min until the solids are completely dissolved, and finally get V 2 o 5 , Nb 2 o 5 and MoO 3 Prebody I of

[0041]Step 2, weigh 600kg titanium-tungsten powder, 50kg glass fiber, 1.75kg carboxymethyl cellulose, 7.5kg polyethylene oxide, 7.5kg50% lactic acid, add 200kg deionized water, 60kg ammonia water and the precursor I obtained in step 1 Mixing, the time is 60 minutes, to obtain a uniformly mixed plastic mud with a certain degree; the plastic mud is pre-extruded through a screen filter to remove large particles of impurities, and the water and components are further mixed evenly; then vacuum extrusion Forming, the vacuum degree is -0.1Mpa, the extrusion speed is 1.5m / s, and a dense and uniform honeycomb catalyst body is obtained; the catalyst body is microwave-dried, the mic...

Embodiment 2

[0044] Step 1, weigh 13.4kg ammonium metavanadate, 15.6kg ammonium heptamolybdate, 6.6kg niobium oxalate, 15kg monoethanolamine, mix with 80kg deionized water, heat and stir to 90°C, keep warm for 30min until the solids are completely dissolved, and finally get V 2 o 5 , Nb 2 o 5 and MoO 3 Prebody II of

[0045] Step 2: Weigh 600kg of titanium-tungsten powder, 50kg of glass fiber, 1.75kg of carboxymethyl cellulose, 7.5kg of polyethylene oxide, 7.5kg of 50% lactic acid, add 200kg of deionized water, 60kg of ammonia water and the precursor II obtained in step 1. Mixing, the time is 60min, and the plastic mud is uniformly mixed and has a certain degree of plasticity; the plastic mud is pre-extruded through a screen filter, and then vacuum extruded, the vacuum degree is -0.1Mpa, and the extrusion speed is 1.5m / s to obtain a dense and uniform honeycomb catalyst body; the catalyst body is microwave-dried, the microwave treatment power is 200W, and the treatment time is 2h to r...

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Abstract

The invention relates to a preparation method for a high-temperature flue gas denitrification catalyst and belongs to the technical field of flue gas denitrification. The preparation method comprises the following two steps: preparing a precursor; and preparing a catalyst. According to the technical scheme, the preparation method comprises the steps: by taking V2O5 as a main active component and Nb2O5 and MoO3 as an auxiliary active component, preparing the precursor of V2O5, Nb2O5 and MoO3; and then mixing the precursor by titanium tungsten powder taking TiO2 and WO3 as main components through extrusion molding, drying and water removal and roasting processes to prepare the catalyst. The problem that the SCR denitration efficiency is relatively low when the flue gas temperature of a coal-fired power plant is 280-300 DEG C is solved. Moreover, in the catalyst preparation process, a microwave drying technology is adopted to overcome the defect of cracking and uneven size distribution caused by temperature gradient in a conventional drying technology, so that the drying time is shortened and the production efficiency is improved. The invention further relates to a denitrification catalyst prepared by the method, so that the low-temperature activity of the catalyst is improved and the active temperature window is expanded, and the preparation method has beneficial technical effects.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature flue gas denitration catalyst, and also relates to a denitration catalyst prepared by the method, which belongs to the technical field of flue gas denitration. Background technique [0002] Nitrogen oxides (NO x ), will not only cause a series of environmental pollution, such as destruction of the ozone layer, acid rain, greenhouse effect, photochemical smog, etc., but also endanger plant growth and cause human respiratory diseases. NO x The sources of emissions are mainly from electricity and heat production and supply industries. In recent years due to NO x The social problems caused by emissions are becoming more and more significant, and the State Environmental Protection Agency has x Emission reduction has put forward more stringent requirements, as the country's NO x Emission standards are getting higher and higher. According to the requirements of the "National Environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/12B01J31/38B01J37/34B01D53/86B01D53/56
Inventor 许小兵刘江峰徐辉
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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