Composite catalyst based on denitration and demercuration reinforcing function of prepositive SCO smoke of coal-fired power plant and preparation method thereof

A technology for composite catalysts and coal-fired power plants, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of reduced oxidation efficiency and uneconomical conditions, and achieve enhanced oxygen storage performance, reliable performance, and high efficiency Effect of Hg Oxidation Removal Efficiency

Inactive Publication Date: 2017-01-11
WUHAN UNIV
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of pilot-scale experiments as well as field experiments have shown that no matter what catalyst is used, the SCR process has no effect on Hg 0 The oxidation efficiency is not satisfactory, and it may also inhibit the reduction and removal efficiency of NOx
There are two essential factors that limit its mercury removal efficiency: NH 3 with Hg 0 There is a competitive relationship, and a large amount of NH in the SCR process 3 Injection of Hg will be severely suppressed 0 React with the solid-gas interface of the SCR catalyst, resulting in a reduction in oxidation efficiency; the SCR process has a negative effect on Hg 0 The oxidation efficiency depends heavily on the HCl components in the flue gas (HCl and O 2 Synergistic oxidation of coal), the Cl content of coal in my country is much lower than that of other countries, artificially adding HCl or NH to the SCR process 4 Cl to increase the efficiency of mercury oxidation is obviously uneconomical
[0004] On the other hand, the denitrification efficiency of the SCR process has no upper limit in theory, but the main consideration in the actual application process is the cost issue

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite catalyst based on denitration and demercuration reinforcing function of prepositive SCO smoke of coal-fired power plant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Evenly mix 4.5ml of deionized water and 90ml of absolute ethanol, add 1.1g of cerium nitrate Ce(NO 3 ) 3 ·6H 2 O, fully stirred to obtain solution A; 22ml of butyl titanate was added to 88 parts by volume of absolute ethanol and uniformly mixed to obtain solution B. Add solution A to solution B dropwise, add 0.5ml of glacial acetic acid dropwise, and keep stirring for 2 hours to obtain a brown-yellow sol;

[0040] (2) Place the sol obtained in step (1) to age naturally for 36 hours at room temperature (to form a gel);

[0041] (3) Dry the gel obtained in step (2) at 80°C for 28 hours, and grind it properly to obtain a light yellow powder with an average particle size of <0.5mm;

[0042] (4) Put the light yellow powder obtained in step (3) in a temperature-programmed muffle furnace, control the heating rate to 4°C / min, and the air flow rate to 50ml / min, and roast it at the end temperature of 500°C for 1h, and cool to room temperature;

[0043] (5) Sieve the calc...

Embodiment 2

[0050] (1) Evenly mix 4.5ml of deionized water and 90ml of absolute ethanol, add 1.4g of cerium nitrate Ce(NO 3 ) 3 ·6H 2 O, fully stirred to obtain solution A; 22ml of butyl titanate was added to 88 parts by volume of absolute ethanol and uniformly mixed to obtain solution B. Add solution A to solution B dropwise, add 0.5ml of glacial acetic acid dropwise, and keep stirring for 2.5h to obtain a brown-yellow sol;

[0051] (2) Place the sol obtained in step (1) at room temperature for natural aging for 40 hours (to form a gel);

[0052] (3) Dry the gel obtained in step (2) at 85°C for 24 hours, and grind it properly to obtain a light yellow powder with an average particle size of <0.5mm;

[0053] (4) Put the light yellow powder obtained in step (3) in a temperature-programmed muffle furnace, control the heating rate to 4°C / min, and the air flow rate to 50ml / min, and roast at the end temperature of 500°C for 1.5h, and cool to room temperature;

[0054] (5) Sieve the calcine...

Embodiment 3

[0061] (1) Evenly mix 4.5ml of deionized water and 90ml of absolute ethanol, add 1.7g of cerium nitrate Ce(NO 3 ) 3 ·6H 2 O, fully stirred to obtain solution A; 22ml of butyl titanate was added to 88 parts by volume of absolute ethanol and uniformly mixed to obtain solution B. Add solution A to solution B dropwise, add 0.5ml of glacial acetic acid dropwise, and keep stirring for 3 hours to obtain a brown-yellow sol;

[0062] (2) Place the sol obtained in step (1) at room temperature for natural aging for 48 hours (to form a gel);

[0063] (3) Dry the gel obtained in step (2) at 90°C for 20 hours, and grind it properly to obtain a light yellow powder with an average particle size of <0.5mm;

[0064] (4) Put the light yellow powder obtained in step (3) in a temperature-programmed muffle furnace, control the heating rate to 4°C / min, and the air flow rate to 50ml / min, and roast at the end temperature of 500°C for 2 hours, and cool to room temperature;

[0065] (5) Sieve the c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a composite catalyst based on a denitration and demercuration reinforcing function of prepositive SCO smoke of a coal-fired power plant and a preparation method thereof. Main active ingredients of the composite catalyst are Co3O4 and CuCl2, and a carrier ingredient is Ce-doped TiO2. The preparation method includes: adopting a sol-gel method to prepare a Ce-doped TiO2 carrier, adopting an impregnation method to sequentially load Co3O4 and CuCl2. A selective catalytic oxidation unit using the catalyst as a main body is arranged at the front end of an SCR unit, oxidation of Hg0 does not be influenced by the ammonification process of the SCR unit, and high mercury oxidation removing efficiency can be realized in a chlorine-free condition. In addition, the catalyst can convert part of NO into NO2 while efficiently oxidizing Hg0, so that reaction efficiency of subsequent SCR process is improved remarkably. The catalyst is easy-to-get in raw material, simple in preparation method, easy-to-implement in technical process and conducive to industrial application.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a composite catalyst capable of realizing enhanced denitrification and mercury removal functions of flue gas in coal-fired power plants based on the pre-SCO theory combined with an existing SCR unit and a preparation method thereof. Background technique [0002] With the continuous development of our country's social economy and the gradual improvement of people's living standards, the accompanying environmental pollution problems have become increasingly prominent. my country's coal-based energy structure will not change in the short term, and the environmental pollution problems of flue gas such as nitrogen oxides and sulfur oxides will become increasingly serious. At the same time, in order to meet the construction needs of ecological civilization and scientific development, the country's governance standards for air pollutants are becoming more and more stringent. The new...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J27/10B01J27/122B01D53/86B01D53/56B01D53/64
CPCB01J27/135B01D53/8628B01D53/8665B01D2257/404B01D2257/602B01J27/10B01J27/122
Inventor 胡将军李鸿鹄王圣恺
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap