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Catalyst metal heating surface for reducing NOx content in flue gas and preparation method thereof

A catalyst metal and heating surface technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as smog, air preheater blockage, corrosion, etc. , to achieve the effect of simple process, reduced emission and long service life

Active Publication Date: 2021-02-26
TSINGHUA UNIV
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Problems solved by technology

These escaped NH 3 with SO in flue gas 3 combined to form NH 4 HSO 4 or (NH 4 ) 2 SO 4 , it is easy to condense on the surface of the air preheater at a lower temperature, causing blockage and corrosion of the air preheater; if it is not mixed with SO 3 synthesized, it is directly discharged into the atmosphere, causing smog

Method used

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  • Catalyst metal heating surface for reducing NOx content in flue gas and preparation method thereof
  • Catalyst metal heating surface for reducing NOx content in flue gas and preparation method thereof

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preparation example Construction

[0020] The preparation method provided by the invention specifically comprises the steps: the preparation method of the nano-catalyst comprises the steps:

[0021] 1) The tungsten-nickel-iron composite oxide powder is solidified on the outer surface of the metal tube by high-temperature spraying to form a layer of nanoparticle catalytic active coating, in which tungsten, nickel and iron elements all exist in the form of oxides; tungsten , The molar ratio of nickel and iron elements is 1:20~32:67~79; the thickness of the nanoparticle catalytic active coating is generally 0.3-1.2mm.

[0022] The spraying method can adopt supersonic flame spraying, high temperature and low pressure plasma spraying process or cold spraying, etc., and the purpose is to form a firm nanoparticle catalytic active coating on the outer surface of the metal tube;

[0023] 2) Put the metal tube cured with nanoparticle catalytically active coating in O 2 The concentration is 6.4%~8.8%, CO 2 Heat treatmen...

Embodiment

[0027] Embodiment: prepare nano-catalyst coating by following steps:

[0028] Choose tungsten-nickel-iron composite oxide, tungsten, nickel and iron all exist in the form of oxide, and the molar ratio of tungsten, nickel and iron is 1:25:73. The metal tube has a diameter of 38 mm and a length of 300 mm. The nano-catalyst is sprayed on the outer surface of the tube by means of high-temperature and low-pressure plasma spraying to form a layer of nano-particle catalytic active coating with a thickness of 0.8-1.1 mm; the nano-catalyst will be sprayed Coated metal heating surface tubes, placed in O 2 The concentration is 7.1%, CO 2 Heat treatment at 670°C for 36 minutes in a dry flue gas atmosphere with a concentration of 11.2%.

[0029] The prepared catalyst metal heating surface, fly ash and quartz sand are respectively placed in a quartz glass tube reactor and heated by an electric heating furnace, wherein the fly ash and quartz sand exist in the form of a fixed bed. as attac...

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Abstract

A catalyst metal heating surface for reducing NOx content in flue gas and a preparation method thereof belong to the technical field of flue gas pollutant control. The metal heating surface of the catalyst includes a metal tube and a catalytic active coating of nanoparticles solidified on the surface of the metal tube; the catalyst is a tungsten-nickel-iron composite oxide, wherein tungsten, nickel and iron all exist in the form of oxides. The preparation method is that the tungsten-nickel-iron composite oxide powder is solidified on the outer surface of the metal heating surface pipe by spraying to form a nano particle catalytic active substance coating. The catalytically active substances formed on the surface after spraying should be between 660°C and 688°C, containing O 2 and CO 2 heat treatment in a dry flue gas atmosphere. The invention can reduce the concentration of NO in the flue gas by about 75%, reducing the discharge of NOx to the environment, and at the same time, the catalytically active coating has strong anti-wear performance and has little influence on the heat transfer characteristics and mechanical strength of the heating surface. It can be widely used in superheaters, reheaters and flue gas purification treatment equipment in combustion equipment.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollutant control, and in particular relates to a catalytic metal heating surface for reducing the NO content in flue gas and a preparation method thereof. Background technique [0002] In 2015, China's nitrogen oxide emissions reached 18.51 million tons, posing a huge threat to the natural environment and human development. The main source of NOx is the combustion process of various fuels. According to the latest revision of "Emission Standards of Air Pollutants for Thermal Power Plants" [0003] (GB13223-2011), new boiler NOx emission requirements <100mg / m 3 , and the ultra-low emission index proposed in recent years requires that the NOx emission concentration of coal-fired generating units be reduced to 50mg / m 3 Below, the pressure to reduce emissions is enormous. [0004] The methods for controlling NOx emissions in flue gas mainly include low-nitrogen combustion technology and flue g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/204B01D2255/20738B01D2255/20753B01D2255/20776B01J23/888
Inventor 柯希玮蔡润夏张海杨海瑞张缦刘青张贤吕俊复
Owner TSINGHUA UNIV
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