Method for coating fire coal fly ash with nanoparticles

A technology of nano-particles and over-combustion of coal, which is applied in the direction of combustion method, fuel burned in melting state, combustion type, etc., can solve the problem of ash on the heating area of ​​the boiler, achieve the effect of prolonging the life of the boiler, improving the power generation efficiency of the boiler, and reducing the impact

Inactive Publication Date: 2022-02-11
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that it is difficult to effectively solve the problem of ash accumulation on the heating s...

Method used

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  • Method for coating fire coal fly ash with nanoparticles
  • Method for coating fire coal fly ash with nanoparticles

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Embodiment 1

[0034] A method of coating coal-fired fly ash with nanoparticles in this embodiment, simultaneously injecting two different streams of nanoparticles into the impinging flow reactor 10 in a tangential swirl, and the different streams of nanoparticles interact with the fly ash of coal-burning respectively , trigger Marangoni convection, and realize the modified coating of coal-fired fly ash. Specifically, in this embodiment, the first nanoparticle flow causes the surface tension of coal-fired fly ash to increase, and Al 2 o 3 At least one of , MgO, MnO, CaO, the second nanoparticle flow causes the surface tension of coal-fired fly ash to increase, and SiO can be used 2 、TiO 2 , B 2 o 3 、Na 2 At least one of O.

[0035] Such as figure 1 As shown, the nanoparticle flow is injected into the impingement flow reactor 10 through the nanoparticle injection system, and the coal-fired fly ash is injected into the impingement flow reactor 10 through the coal-fired fly ash injection...

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Abstract

The invention discloses a method for coating fire coal fly ash with nanoparticles, and belongs to the technical field of ash deposition prevention and control. According to surface tension gradient generated by component concentration difference generated by contact of coal-fired fly ash and nano-particles with different properties, the Marangoni effect is further caused, the movement direction of the nano-particles in the coal-fired fly ash is changed, the direction and strength of Marangoni convection are adjusted, rotational flow impact is carried out by oppositely and simultaneously spraying in the tangential direction of the high-temperature impinging stream reactor, so that the coal-fired fly ash is uniformly coated with the nano-particles. By adopting the method disclosed by the invention, the quality of a coating product can be enhanced, the structure and composition of the fly ash deposition layer are regulated and controlled by utilizing the Marangoni effect, further the viscosity of the coal-fired fly ash is effectively reduced, the deposition of the fly ash is inhibited, the influence of the formation and deposition of the fly ash on the overall system efficiency is reduced, and the method has great significance in prolonging the service life of a boiler, improving the power generation efficiency of the boiler and expanding the application field of fire coal.

Description

technical field [0001] The method of the invention belongs to the technical field of ash deposition prevention and control, and more specifically relates to a method for coating coal-burning fly ash with nanoparticles. Background technique [0002] China has abundant coal reserves and is easy to obtain. Coal-fired power generation is the main source of electricity acquisition in my country, accounting for about 73% of the total power generation and nearly half of the total coal consumption. Coal will still be the most important fuel for a long time in the future. However, coal combustion forms a large number of fly ash particles ranging from nanometers to hundreds of microns. As the flue gas scours the heating surface of the boiler, the molten coal-fired fly ash in the flue gas will also deposit on the heating surface. Most of the dust accumulation occurs on the convection heating surface, especially the tail heat exchange tube bundle, such as economizer, air preheater, etc....

Claims

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Application Information

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IPC IPC(8): F23C10/04F23C10/18F23L15/04
CPCF23C10/04F23C10/18F23L15/04Y02E20/34
Inventor 王计敏陈喜韩立新焦坤
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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