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Preparing method for vanadium based composite titanium dioxide catalyst used in ammonium bisulfate decomposition during De-NOxDenitration

A technology of composite titanium dioxide and catalyst, which is applied in the field of denitrification catalyst, can solve the problems of corroding the air preheater, high risk of flushing, blocking the pores of the air preheater, etc., and achieves simple process, strong operability, and reduced decomposition The effect of temperature

Inactive Publication Date: 2017-02-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The generated ammonium bisulfate has a certain viscosity after absorbing the moisture in the flue gas. Usually, the melting point is 147°C. The operating temperature of the cold end is generally lower than the dew point of ammonium bisulfate. After the SCR denitrification catalyst has been running for a period of time, it will block the pores of the air preheater, causing a large back pressure and corroding the air preheater. If it is not treated in time It will make the SCR denitrification system unable to operate normally, and cause damage to the device at the same time
[0009] At present, the method commonly used in the industry is online high-pressure water flushing technology. This technology has extremely high requirements for boiler operating parameters, and at the same time, the risk of flushing during operation is high. However, cleaning with chemical reagents in the off-line state is costly and long-term. The effect of washing with normal temperature and high pressure water is not ideal

Method used

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  • Preparing method for vanadium based composite titanium dioxide catalyst used in ammonium bisulfate decomposition during De-NOxDenitration
  • Preparing method for vanadium based composite titanium dioxide catalyst used in ammonium bisulfate decomposition during De-NOxDenitration
  • Preparing method for vanadium based composite titanium dioxide catalyst used in ammonium bisulfate decomposition during De-NOxDenitration

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Effect test

Embodiment 1

[0027] A preparation method of a vanadium-based composite titanium dioxide catalyst used for the decomposition of ammonium bisulfate in the process of industrial flue gas denitrification comprises the following steps in sequence:

[0028] (1) Add 250g of metatitanic acid into 1L of water, stir, heat to 80°C, adjust its pH value to 5 with ammonia water, filter, wash, dry, and then roast at 400°C to obtain the corresponding composite titanium dioxide;

[0029] (2) get the titanium dioxide prepared in 99g (1), add 1.2g ammonium metavanadate;

[0030] (3) The mixture obtained in (2) was added to 0.5 L of water, heated to 70°C, stirred, evaporated to dryness, and calcined at 500°C to obtain the corresponding vanadium-based titanium dioxide catalyst. figure 2 The thermogravimetric curve of the prepared vanadium-based titanium dioxide catalyst loaded with 10% by mass of ammonium bisulfate. It can be seen that the fastest decomposition temperature of this vanadium-based titanium dio...

Embodiment 2

[0032] A preparation method of a vanadium-based composite titanium dioxide catalyst used for the decomposition of ammonium bisulfate in the process of industrial flue gas denitrification comprises the following steps in sequence:

[0033] (1) Add 300g of metatitanic acid to 1L of water, then add 9.8g of antimony acetate, stir, heat to 80°C, adjust its pH value to 6.0 with ammonia water, filter, wash, dry, and then roast at 500°C to obtain the corresponding antimony doped titanium dioxide;

[0034] (2) Get 98g of the antimony-doped titanium dioxide prepared in (1), add 2.4g of ammonium metavanadate, and then add 0.7L of water to form a certain mixed solution;

[0035] (3) Heating the mixed liquid obtained in (2) to 75° C., stirring, evaporating to dryness, and calcining at 550° C. to obtain the corresponding vanadium-based antimony-doped titanium dioxide catalyst. image 3 The thermogravimetric curve of the prepared vanadium-based antimony-doped titanium dioxide catalyst loade...

Embodiment 3

[0037] A preparation method of a vanadium-based composite titanium dioxide catalyst used for the decomposition of ammonium bisulfate in the process of industrial flue gas denitrification comprises the following steps in sequence:

[0038] (1) Add 400g of metatitanic acid to 1L of water, then add 17g of barium sulfate, stir, heat to 80°C, adjust its pH value to 6.0 with ammonia water, filter, wash, dry, and then roast at 600°C to obtain the corresponding Barium sulfate doped titanium dioxide;

[0039] (2) get the barium sulfate doped titanium dioxide prepared in 97g (1), 3.6g ammonium metavanadate, then add 1.0L water;

[0040] (3) Heating the mixed solution obtained in (2) to 80° C., stirring, evaporating to dryness, and calcining at 600° C. to obtain the corresponding vanadium-based barium sulfate-doped titanium dioxide catalyst. Figure 4 The thermogravimetric curve of the prepared vanadium-based barium-doped titanium dioxide catalyst loaded with 10% by mass of ammonium bis...

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Abstract

The invention discloses a preparing method for vanadium based composite titanium dioxide catalyst used in ammonium bisulfate decomposition during De-NOxDenitration. The preparing method comprises the steps of preparing composite titanium dioxide, loading the vanadium onto the composite titanium dioxide, and roasting the vanadium based composite titanium dioxide. According to the preparing method for vanadium based composite titanium dioxide catalyst used in ammonium bisulfate decomposition during De-NOxDenitration, through loading certain vanadium pentoxide onto the composite titanium dioxide, vanadium based composite titanium dioxide catalyst is obtained, which can reduce decomposing temperature of ammonium bisulfate; meanwhile, the preparing method is simple in technique, strong in operability, and is applicable to large-scale industrialization.

Description

technical field [0001] The invention belongs to the technical field of denitrification catalysts, in particular to a NH catalyst used in flue gas denitrification 4 HSO 4 A method for preparing a decomposed vanadium-based composite titanium dioxide catalyst. Background technique [0002] Nitrogen oxides are the key pollutant emission reduction objects of my country's "Twelfth Five-Year Plan". From January 1, 2014, the nitrogen oxide emissions of thermal power units put into operation in all key and non-key areas are required to be reduced to 100mg / m3 respectively. 3 and 200mg / m 3 . At present, relevant domestic thermal power plants basically choose selective catalytic reduction (SCR) flue gas denitrification technology for the removal of nitrogen oxides. [0003] In the SCR flue gas denitrification process, since the catalyst will convert the SO in the flue gas 2 Oxidation to SO 3 , while SO 3 Will interact with the NH used in the denitrification process 3 It reacts t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22
CPCB01J23/22
Inventor 吴晓东许腾飞冉锐翁端司知蠢
Owner TSINGHUA UNIV
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