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High-temperature-creep-resistant wear-resistant pouring material for circulating fluidized bed boiler

A circulating fluidized bed, high temperature resistance technology, applied in the field of circulating fluidized bed boiler power generation, can solve the problems of increasing repair costs, affecting economic efficiency, falling off, etc., to enhance high temperature creep resistance and wear resistance, and reduce repairs. Frequency and cost, the effect of good thermal shock stability

Inactive Publication Date: 2016-10-26
宜兴市中环耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the power generation industry of circulating fluidized bed boilers, castables are mainly used for masonry at the inlet and outlet of the boiler. In the case of high temperature, high temperature creep, easy wear, cracking and even falling off often occur, causing this part to be repaired every 3-6 months, which not only increases the repair cost, but also increases the operating cost for the user, and even affects its economic efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: High-temperature creep-resistant and wear-resistant castable for circulating fluidized bed boilers, including the following components in terms of mass percentages: 5% metallic silicon micropowder, 65% silicon carbide, 10% aluminum oxide, 5% andalusite, molybdenum 5% camel, 0.5% mullite synthetic fiber, 1% pure calcium aluminate cement, 6% boron nitride and 2.5% additives. The additive is formed by mixing 30% polyvinyl alcohol and 70% sodium polysilicate in mass percentage.

Embodiment 2

[0008] Example 2: High-temperature creep-resistant and wear-resistant castable for circulating fluidized bed boilers, characterized in that it includes the following components in terms of mass percentage: 3% metallic silicon powder, 65% silicon carbide, 8% aluminum oxide, and 5% andalusite %, 5% mullite, 0.5% mullite synthetic fiber, 1% pure calcium aluminate cement, 6% boron nitride and 2.5% additives. The additive is formed by mixing 30% polyvinyl alcohol and 70% sodium polysilicate in mass percentage.

Embodiment 3

[0009] Example 3: A high-temperature creep-resistant castable for circulating fluidized bed boilers, characterized in that it includes the following components in terms of mass percentages: 3% silicon metal powder, 70% silicon carbide, 6% aluminum oxide, andalusite 5% %, mullite 2%, mullite synthetic fiber 0.5%, pure calcium aluminate cement 1%, boron nitride 6% and additive 2.5%. The additive is formed by mixing 50% polyvinyl alcohol and 50% sodium polysilicate in mass percentage.

[0010] In the above-mentioned embodiment, each raw material is smelted into a premix in a strong stirring reactor in proportion, and then the premix is ​​put into a mold, and isostatic pressing equipment is used for three times of compression molding, and the pressure of the three times is 20~40 MPa respectively. , 60~70MPa, 80~100MPa, the pressed semi-finished product is fired at a temperature of 1400~1600°C in an oxidizing or reducing atmosphere. The reducing atmosphere is made of pine coke, and...

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PUM

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Abstract

A high-temperature-creep-resistant wear-resistant pouring material for a circulating fluidized bed boiler comprises the following components in percentages by mass: 3-5% of metallic silicon micropowder, 65-70% of silicon carbide, 6-10% of aluminium oxide, 5-8% of andalusite, 2-5% of mullite, 0.5-2% of mullite synthetic fibers, 1-5% of pure aluminum silicate cement, 6-8% of boron nitride and 2-5% of an additive.

Description

technical field [0001] The invention relates to the power generation industry of circulating fluidized bed boilers. Background technique [0002] In the power generation industry of circulating fluidized bed boilers, castables are mainly used for masonry at the inlet and outlet of the boiler. In the case of high temperature, high temperature creep, easy wear, cracking and even falling off often occur, causing this part to be repaired every 3-6 months, which not only increases the repair cost, but also increases the operating cost for the user, and even affects its economic efficiency. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention provides a device with better thermal shock stability, enhanced high-temperature creep resistance and wear resistance, improved service life, reduced repair frequency and cost, and high efficiency and energy saving. High-temperature creep and wear-resistant castables for circulating fluidiz...

Claims

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Application Information

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IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 袁根芳
Owner 宜兴市中环耐火材料有限公司
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