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Process for producing carbon/carbon heat insulation bottom board for high temperature furnace

A technology for high-temperature furnaces and bottom plates, which is applied in coking ovens, special forms of dry distillation, and the petroleum industry. It can solve problems such as difficulty in forming graphite heat-insulating bottom plates, unstable graphite product structure, and reduced equipment utilization, and achieves practicability. Strong, lightweight, and improved utilization

Active Publication Date: 2008-09-24
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing large-diameter heat-insulating bottom plates, it is difficult to form traditional graphite heat-insulating bottom plates, and the price is high; the structure of graphite products is not stable, the strength is low, and the thermal conductivity is high. Traditional graphite products are easy to react with the environment in the high-temperature furnace. Use Short life and high replacement rate, which reduces the utilization rate of equipment and increases maintenance costs

Method used

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  • Process for producing carbon/carbon heat insulation bottom board for high temperature furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Use 3K carbon fiber plain or twill cloth and thin carbon fiber mesh tires to alternately lay layers, and axially (that is, the thickness direction of the layer) needling to form a full carbon fiber three-way structure prefabricated body, the needling density is 25 needles / cm 2 ;The density of the prefabricated body with full carbon fiber structure is 0.20g / cm 3 ; where K represents the number of thousands of tows.

[0026] (2) Furfurone resin vacuum impregnation and carbonization densification process: Under the pressure of -0.086MPa, the all-carbon fiber three-way structure prefabricated body in step (1) is immersed in the impregnation tank for 1.5 hours, and then transferred to the carbonization furnace Carry out carbonization treatment at 900°C to produce charcoal / charcoal products.

[0027] (3) The density of charcoal / charcoal products is 0.50g / cm 3 At the end of the densification process, the carbon / carbon products are subjected to high-temperature purificati...

Embodiment 2

[0031] (1) Use 6K carbon fiber plain or twill cloth and thin carbon fiber mesh tires to alternately lay layers, and axially (that is, the thickness direction of the layer) needle-puncture the three-way structure prefabricated body of carbon fiber, and the needle-punching density is 35 needles / cm 2 ;The density of the prefabricated body is 0.30g / cm 3 ; where K represents the number of thousands of tows.

[0032] (2) Furfurone resin vacuum impregnation and carbonization densification process. Under the pressure of -0.092MPa, the all-carbon fiber three-way structure preform in step (1) is immersed in the impregnation tank for 2 hours, and then transferred to carbonization after leaving the tank Carry out carbonization treatment in a furnace at 950°C to produce charcoal / charcoal products.

[0033] (3) The density of charcoal / charcoal products is 0.80g / cm 3 At the end of the densification process, the carbon / carbon products are subjected to high-temperature purification treatment...

Embodiment 3

[0037] (1) Use 12K carbon fiber plain or twill cloth and thin carbon fiber mesh tires to alternately lay layers, and axially (that is, the thickness direction of the layer) needle-puncture the three-way structure prefabricated body of carbon fiber, and the needle-punching density is 40 needles / cm 2 ;The density of the prefabricated body is 0.40g / cm 3 ; where K represents the number of thousands of tows.

[0038] (2) Furfurone resin vacuum impregnation and carbonization densification process. Under the pressure of -0.098MPa, the all-carbon fiber three-way structure preform in step (1) is immersed in the impregnation tank for 2.5 hours, and then transferred to carbonization after leaving the tank Carbonization treatment is carried out in the furnace at 1100°C to produce charcoal / charcoal products.

[0039] (3) The density of charcoal / charcoal products is 1.0g / cm 3 At the end of the densification process, the carbon / carbon products are subjected to high-temperature purification...

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Abstract

The present invention relates to a preparation method of C / C insulating bottom plate that is used for a high-temperature furnace. In the method, carbon fiber plain weaves or twill is laid alternately with fetus of thin carbon fiber network; axial needle prick is used for preparing the prefabricated body of the low-density insulating bottom plate; furfural acetone resin or phenolic resin is used for vacuum impregnation, curing, carbonizing and densifing the prefabricated body of the insulating bottom plate; the prefabricated body is repeatedly densified 2 to 4 times until the density reaches more than or equal to 0.50g / cm<3>; after the densification, the prefabricated body is processed through high-temperature purification under the conditions with chlorine or Freon; and the C / C insulating bottom plate, which is used for a high-temperature furnace, can be prepared after mechanical processing. The preparation method has the significant characteristics that: first, the conditions for densification are simplified, the costs are reduced, and the preparation method is suitable for producing large-size products; secondly, the resin carbon-based matrix reduces the thermal conductivity of the C / C insulating bottom plate, improves the effects of heat preservation in the hot field and saves energy; and thirdly, the C / C insulating bottom plate has high mechanical properties, and the service life is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a charcoal / charcoal heat-insulating bottom plate for a high-temperature furnace, and belongs to the technical field of heat-preservation and heat-insulation materials for a high-temperature furnace. Background technique [0002] Traditional high-temperature furnaces generally use graphite heat-insulating bottom plates, and the furnace temperature of high-temperature furnaces is generally above 1000°C. When producing large-diameter heat-insulating bottom plates, it is difficult to form traditional graphite heat-insulating bottom plates, and the price is high; the structure of graphite products is not stable, the strength is low, and the thermal conductivity is high. Traditional graphite products are easy to react with the environment in the high-temperature furnace. Use The service life is short and the replacement rate is high, which reduces the utilization rate of the equipment and increases the mainten...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/83C10B53/08
Inventor 谢乔肖志超李永军侯卫权苏君明彭志刚孟凡才姚西明张涛
Owner XIAN CHAOMA SCI TECH
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