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Environmental-protecting chemical gas-phase permeating technical method with stable running and device thereof

A chemical vapor infiltration and stable operation technology, applied in gaseous chemical plating, metal material coating process, coating, etc., can solve problems such as tar and carbon black substances are easy to block, pollute vacuum equipment, and poisonous substances pollute the environment. Achieve the effect of reducing clogged pipes and polluting vacuum equipment and ensuring stable operation

Active Publication Date: 2009-10-14
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of further thermal polycondensation reaction of intermediate products in the tail gas to form non-toxic carbon black substances that are easy to capture, thereby overcoming tar and carbon black substances in the tail gas that are easy to block pipelines and pollute vacuum equipment The environment-friendly chemical vapor infiltration process and its device can be stably operated by producing high-quality carbon black, which has the disadvantages of polluting the environment with toxic substances

Method used

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  • Environmental-protecting chemical gas-phase permeating technical method with stable running and device thereof
  • Environmental-protecting chemical gas-phase permeating technical method with stable running and device thereof

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Experimental program
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Effect test

Embodiment 1

[0031] The carbon fiber prefabricated body is placed in a collective environment-friendly chemical vapor infiltration process equipment for densification treatment. The gap between the prefabricated body and the inner wall of the equipment is 5mm; hydrogen-diluted propane gas is used as the carbon source, and the gas flow rate is 50ml / s; The temperature in the densification zone of the preform is 1100°C±20°C, and the temperature in the tail gas thermal condensation polymerization-carbon black capture zone is 1200±20°C. During the 200-hour densification process, the total amount of carbon-containing pollutants discharged from the tail gas is only 15% of that of the conventional chemical vapor infiltration process, and the content of toxic substances in the tail gas is only 18% of that of the conventional chemical vapor phase infiltration process.

Embodiment 2

[0033] Put the carbon fiber prefabricated body in a discrete environment-friendly chemical vapor infiltration process equipment for densification treatment, the gap between the prefabricated body and the inner wall of the equipment is 8mm; hydrogen-diluted propane gas is used as the carbon source, and the gas flow rate is 100ml / s ; The temperature in the densification zone of the preform is 1100°C±20°C, the temperature of the tail gas transfer pipe is maintained at 600±100°C, and the temperature of the tail gas high-temperature pyrolysis furnace is 1200±20°C. During the 300-hour densification process, the total amount of carbon-containing pollutants discharged from the tail gas is only 12% of that of the conventional chemical vapor infiltration process, and the content of toxic substances in the tail gas is only 16% of that of the conventional chemical vapor phase infiltration process.

Embodiment 3

[0035]The carbon fiber prefabricated body is placed in a collective environment-friendly chemical vapor infiltration process equipment for densification treatment. The gap between the prefabricated body and the inner wall of the equipment is 5mm; hydrogen-diluted propane gas is used as the carbon source, and the gas flow rate is 50ml / s; The temperature in the densification zone of the preform is 1000°C±20°C, and the temperature in the tail gas thermal condensation polymerization-carbon black capture zone is 1100±20°C. Multiple batches of carbon fiber prefabricated bodies have been subjected to chemical vapor infiltration for a total of 10,000 hours. After inspection, there is no obvious pollution in the exhaust gas pipeline of the chemical vapor infiltration furnace and the vacuum pump equipment.

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Abstract

The invention belongs to an environmental-protecting chemical gas-phase permeating technical method with stable running and a device thereof, in particular relates to a method and a technical device thereof using the residual space or the additional high-temperature space of a CVI furnace for purifying tail gas and obtaining the side product of carbon black. The invention aims to provide the environmental-protecting chemical gas-phase permeating technical method of stable running and the device thereof enabling the intermediate product in the tail gas to generate further thermal polycondensation to form nontoxic carbon black substance of easy trapping so as to overcome the defects that the tar oil and the carbon black substance in the tail gas easily block the pipeline and contaminate the vacuum equipment, and toxic substances pollute the environment, and producing the side product of high-quality carbon black.

Description

technical field [0001] The invention belongs to a stably operating environment-friendly chemical vapor infiltration process method and equipment thereof, in particular to a method for purifying tail gas and obtaining carbon black by-products by using the remaining space in a CVI furnace or an additional high-temperature space and the process equipment thereof. Background technique [0002] Chemical vapor infiltration (CVI) is a major process method for preparing carbon / carbon composites. This method mainly uses the diffusion of carbon source gas into the preform in a high-temperature environment, and a series of complex gas-phase chemical cracking and Thermal polycondensation reaction, the formation of pyrolytic carbon on the surface of the fiber, etc., realizes the densification of the carbon fiber preform. When carbon / carbon composites are prepared by the CVI process, the effective utilization rate of gaseous carbon sources is generally only 5-20wt%, which is usually lower...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/24C23C16/44C23C16/448C23C16/52
Inventor 胡子君李同起
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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