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Experimental method for determining fusion characteristics of coal ash for spraying

An experimental method and technology of coal injection, applied in the investigation phase/state change and other directions, can solve the problems of slow heating speed, relatively far heating speed difference, low experimental efficiency, etc., achieve fast heating speed, prevent chemical reaction, and experimental temperature high effect

Inactive Publication Date: 2013-08-07
SHOUGANG CORPORATION
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AI Technical Summary

Problems solved by technology

However, existing research methods also have shortcomings
The melting characteristics of coal powder ash in the national standard are carried out in a tubular electric furnace. When the furnace reaches 900°C, the heating rate is generally 5°C / min.

Method used

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  • Experimental method for determining fusion characteristics of coal ash for spraying
  • Experimental method for determining fusion characteristics of coal ash for spraying

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Embodiment Construction

[0013] see figure 1 , an experimental method for determining the melting characteristics of pulverized coal ash provided in the embodiments of the present application, comprising the following steps:

[0014] Step 10: Calcining the coal powder to make a coal ash mass, specifically: using a muffle furnace to calcinate the coal powder into coal ash, and using an agate mortar to grind the coal ash to a particle size below 0.1 mm. Drop dextrin solution into the ground coal ash to make the coal ash plastic, and take 0.8-1.2g plastic coal ash to make a cylinder-shaped coal ash mass 3 .

[0015] Step 20: Place the coal ash cluster under a high-temperature confocal laser scanning microscope to observe the morphological change process of the coal ash cluster 3, and determine the initial coal ash deformation temperature, initial liquid phase formation temperature, and liquid phase complete melting temperature of the coal ash cluster 3 , specifically: place coal ash ball 3 on platinum s...

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Abstract

The invention relates to the technical field of coal injection, and especially relates to an experimental method for determining the fusion characteristics of coal ash for spraying. The method comprises the steps that: coal ash is calcined into a coal ash mass; the coal ash mass is placed under a high-temperature confocal laser scanning microscope, and a coal ash mass morphological change process is observed; and initial coal ash deformation temperature, initial liquid phase formation temperature, and liquid phase complete fusion temperature of the coal ash mass are determined. According to the experimental method for determining fusion characteristics of coal ash for spraying, heating speed of the high-temperature confocal laser scanning microscope is high, and spraying coal ash fusion characteristic experiment efficiency is high. The method provided by the invention has high popularization value.

Description

technical field [0001] The invention relates to the technical field of coal injection, in particular to an experimental method for determining the melting characteristics of injection coal fly ash. Background technique [0002] In recent years, the domestic iron and steel industry has developed rapidly, and all iron and steel enterprises have used coal injection to reduce coke as the main means of reducing ironmaking costs. With the increasing demand for domestic PCI coal, the market supply is tight. Blast furnace pulverized coal injection has become a key technology for whether blast furnace ironmaking can compete with other methods, continue to survive and develop. The blockage of the spray gun will make the amount of coal injected at each tuyere of the blast furnace uneven, which will affect the coal injection operation and the smooth operation of the blast furnace. The performance of the injection coal ash melting determines the slagging and clogging of the spray gun t...

Claims

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Application Information

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IPC IPC(8): G01N25/04
Inventor 马泽军王冬青竺维春刘文运
Owner SHOUGANG CORPORATION
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