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High-intensity corrosion-proof chimney lining brick made by mullite and method for manufacturing the same

A technology of chimney lining and manufacturing method, which is applied in the field of mullite high-strength anti-corrosion chimney lining bricks used in thermal power plants and its manufacturing field, which can solve the problems of complicated production and high cost, and achieve good thermal stability and acid and alkali corrosion resistance Good performance and excellent thermal stability

Inactive Publication Date: 2008-06-11
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although these inventions have a certain effect on the internal anti-corrosion of chimneys, the cost is still high and the production is relatively complicated

Method used

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  • High-intensity corrosion-proof chimney lining brick made by mullite and method for manufacturing the same
  • High-intensity corrosion-proof chimney lining brick made by mullite and method for manufacturing the same
  • High-intensity corrosion-proof chimney lining brick made by mullite and method for manufacturing the same

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: Design Al / Si=1.50; Concrete batching addition (percentage by weight): 65.24 parts of fly ash, 34.76 parts of bauxite, 1.50 parts of potassium feldspar; Firing temperature is 1550 ℃, holding time 4 hours.

Embodiment 2

[0027] Embodiment 2: Design Al / Si=0.90; Concrete batching addition (weight percent): 70.10 parts of fly ash, 29.90 parts of bauxite, 2.00 parts of potassium feldspar; Firing temperature is 1450 ℃, holding time 3 hours.

[0028] Example result:

[0029] The mullite mullite high-strength anti-corrosion chimney lining brick prepared by using fly ash in the present invention is analyzed by powder crystal X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the mullite high-strength anti-corrosion The main crystal phase of the chimney lining brick is mullite, such as image 3 ; A large number of mullite microcrystals are in the shape of square columns, densely arranged, and the length of the microcrystals is between 5 and 15 μm, see Figure 4 . As the sintering temperature increases, the mullite crystals gradually change from acicular to columnar, the outline becomes clear from fuzzy, the mullite content gradually increases, and the length of colu...

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Abstract

The invention relates to high-strength antiseptic chimney inner lining bricks and method of production, whereinthe bricks are prepared from coal ash discharged by power-generating plants directly as main raw material through mixing with bauxite and potash feldspar, wet method ball grinding, drying, granulating, forming, drying and sintering.

Description

technical field [0001] The invention belongs to the technical field of refractory materials and ceramic materials, and relates to a mullite high-strength anti-corrosion chimney lining brick for a thermal power plant and a manufacturing method thereof. Background technique [0002] At present, my country's thermal power plants generally use wet flue gas desulfurization technology. During the operation of this method, the flue gas entering the chimney has high humidity and contains strong corrosive substances (chloride, fluoride, sulfuric acid, sulfurous acid, etc.), which is very easy to desulfurize. Fogging on the inner wall of the chimney forms highly corrosive acid, which corrodes the flue and the chimney body or wall, resulting in cracks and inclination of the chimney, which becomes an obstacle to the safe operation of the wet desulfurization device. [0003] For the corrosion of flue gas, the lining materials used in power plant chimneys are: composite titanium alloy, aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/08C04B14/04
CPCY02W30/91
Inventor 李金洪马鸿文
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)