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Method for identifying slagging trend of different mineral components in coal ash

A technology of mineral composition and coal ash, which is applied to the analysis of materials, instruments, etc.

Active Publication Date: 2014-02-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Domestic scholars Yu Dunxi, Xu Minghou and others have used CCSEM technology to analyze about 3,000 mineral particles to obtain the types and contents of the main minerals in coal powder and coal ash. Therefore, the current existing technology can realize ash However, there is no relevant record at home and abroad for identifying the melting and slagging tendency of different mineral components in coal ash by using the sphericity changes of various types of mineral particles during combustion

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  • Method for identifying slagging trend of different mineral components in coal ash
  • Method for identifying slagging trend of different mineral components in coal ash
  • Method for identifying slagging trend of different mineral components in coal ash

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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] The method for identifying the slagging tendency of each mineral component in the coal ash using CCSEM technology disclosed in this embodiment, the specific steps are as follows:

[0021] (1) The raw coal selected in this example is Datong bituminous coal, and the coal ash after pulverized coal is burned in a laboratory-scale settling furnace at 1300 °C in an air atmosphere is collected;

[0022] (2) Use CCSEM technology to analyze the content of various mineral components in raw coal and coal ash, such as figure 1 As shown, the specific method of analysis is: uniformly mix coal powder or c...

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Abstract

The invention discloses a method for identifying the slagging trend of different mineral components in coal ash by using the computer controlled scanning electron microscope (CCSEM) technology. The CCSEM is used for analyzing the type of minerals in the coal ash and raw coals, the contents of all mineral components, the sphericity of mineral particles and the number ratio of similar spherical particles; a sphericity distribution pattern of the minerals with the same chemical compositions in the coal ash and the raw coals is drawn; the possibility of fusing the mineral components is judged according to the increment of the similar spherical particle ratio of the minerals with the same chemical compositions before and after combustion; source minerals of all mineral components in the coal ash are determined to analyze the factor of changing the similar spherical particle ratio of each component to identify the fusing and slagging trend of the coal ash particles of all the mineral compositions. The fusing behavior of the coal ash particles of all the mineral compositions is clearly identified through analyzing the variation of the coal ash particle sphericity of different mineral compositions; the theoretic and technical guidance is provided for identifying the slagging trend of each mineral component in the coal ash and searching the solution from the coal mineral source for the easily slagged mineral components.

Description

technical field [0001] The invention relates to the field of safe and economical operation of coal-fired boilers, in particular to a method for identifying the melting and slagging tendency of each mineral component in coal ash by utilizing the change of the sphericity of mineral particles during coal combustion. Background technique [0002] In coal-fired thermal power plants, the problem of ash deposition (including slagging, contamination, corrosion, etc.) It is an extremely important type of ash deposition problem. Slagging is the slag generated by the collision of softened or molten ash particles on the water wall and the heating surface that mainly receives radiant heat. The surface often accumulates a relatively hard ash sintered layer. In my country, the shortage of coal sources has led to the variable quality of coal used by power plant boilers. The slagging in the furnace caused by the large deviation between the actual coal quality and the designed coal quality w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00
Inventor 温昶徐明厚于敦喜王建培
Owner HUAZHONG UNIV OF SCI & TECH
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