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Preparation method of acid-resistant prefabricated part for carbonization furnaces

A technology for prefabricated parts and carbonization furnaces, applied in the field of refractory materials, can solve problems such as corrosion of carbonization furnace linings, and achieve the effects of enhancing corrosion resistance, good high temperature acid corrosion resistance, and prolonging service life

Inactive Publication Date: 2015-09-02
ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an acid-resistant prefabricated part for a carbonization furnace, aiming to solve the problem that the flue gas generated during the pyrolysis carbonization process seriously corrodes the inner lining of the carbonization furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing an acid-resistant preform for a carbonization furnace, comprising the following steps in sequence: A. According to the mass parts, 20 parts of mullite of 5-8 mm, 10 parts of coke gems of 3-5 mm, and 15 parts of 1-3 mm Burnt gemstone, 6 parts of burnt gemstone of 0~1mm, 10 parts of alumina hollow ball of 0.2~1mm, 15 parts of silicon carbide powder not larger than 200 mesh, 5 parts of burnt gemstone powder not larger than 200 mesh, 5 parts of calcium aluminate cement, Mix 5 parts of alumina powder, 4 parts of silica powder, 0.10 part of water reducer, and 0.02 part of explosion-proof fiber to form a mixture a.

[0022] B. Add water to mixture a and stir evenly to form mixture b, and the mass percentage of water in mixture b is 5%;

[0023] C, the mixture b is poured into the mould;

[0024] D, demoulding after molding in the mold for 4 hours;

[0025] E. Curing for 48 hours;

[0026] F. After the product is cured, raise the temperature to 110°C a...

Embodiment 2

[0029] The difference from other embodiments is that the mixture a includes 10 parts of 5-8mm mullite, 15 parts of 3-5mm burnt gem, 10 parts of 1-3mm burnt gem, 10 parts of 0-1mm Burnt gemstones, 25 parts of alumina hollow spheres of 0.2-1mm, 8 parts of silicon carbide powder not larger than 200 mesh, 10 parts of burnt gemstone powder not larger than 200 mesh, 3 parts of calcium aluminate cement, 3 parts of alumina powder, 6 parts of silicon carbide Micro powder, 0.15 parts of water reducer, 0.01 part of explosion-proof fiber.

[0030] The mass percentage of water in the mixture b is 7%.

Embodiment 3

[0032] The difference from other examples is that the mixture a includes 15 parts of 5-8mm mullite, 12 parts of 3-5mm burnt gem, 12 parts of 1-3mm burnt gem, 5 parts of 0-1mm Burnt gemstones, 22 parts of alumina hollow balls of 0.2-1mm, 11 parts of silicon carbide powder not larger than 200 mesh, 8 parts of burnt gemstone powder not larger than 200 mesh, 5 parts of calcium aluminate cement, 5 parts of alumina powder, 5 parts of silicon carbide Micro powder, 0.10 parts of water reducing agent, 0.02 parts of explosion-proof fiber.

[0033] The mass percentage of water in the mixture b is 5.7%.

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PUM

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Abstract

The invention provides an acid resistant-prefabricated part for carbonization furnaces, which aims to solve the problem of severe corrosion of the flue gas generated in the pyrolytic carbonization process to the carbonization furnace liner. The method sequentially comprises the following steps: stirring, casting molding, demolding, and curing high-temperature treatment. The acid-resistant prefabricated part for carbonization furnaces has the advantages of favorable high-temperature acid corrosion resistance, proper strength, lower heat conductivity coefficient and excellent thermal shock stability, can resist corrosion of oxynitrides, oxysulfides, hydrogen chloride, part of hydrogen fluoride and other strongly acidic gases generated in the pyrolytic carbonization process, compromises the performance requirements for strength and heat conductivity coefficient of the product, and can obviously prolong the service life of the carbonization furnace. By adopting the materials and technique, the prefabricated part has high structural compactness, and thus, flue gas can not easily enter the structure, thereby prolonging the service life. In the flue gas corrosion process, the materials form mutual inhibition, thereby enhancing the corrosion resistance.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a method for preparing an acid-resistant preform for a carbonization furnace. Background technique [0002] Pyrolytic carbonization technology uses high temperature under anaerobic conditions to pyrolyze organic components to form solid carbonized products. During the pyrolytic carbonization process, a large amount of strong acids such as nitrogen oxides, sulfur oxides, carbon oxides, hydrogen chloride, and hydrogen fluoride will be produced. Gas, coupled with the action of high-temperature water vapor, produces flue gas that severely corrodes the lining of the carbonization furnace. At present, there are very few researches directly on the lining materials of carbonization furnaces, and most of them directly use the materials used in other fields as the lining materials of carbonization furnaces. High-alumina castables can meet the requirements of carbonization furnaces in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 常正钦王立旺朱国平王琪李新明
Owner ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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