Title:
CARBON FIBER PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/230055
Kind Code:
A1
Abstract:
Provided is a carbon fiber production method comprising: a carbon fiber producing step including at least a flame-proofing step for obtaining flameproof fibers by performing flame-proofing treatment on precursor fibers through circulation of hot air, and a carbonizing step for obtaining carbonized fibers by performing carbonization treatment on the flameproof fibers; and a discharged gas processing step for performing, by means of a discharged gas combustion device, combustion processing of discharged gas generated in at least the flame-proofing step and the carbonizing step. The discharged gas processing step includes: a heat exchange step for obtaining heated external air through heat exchange between normal external air and the processed discharged gas that has been discharged from the discharged gas combustion device; an external air mixing step for obtaining mixed external air by mixing the heated external air and the normal external air with each other; and a mixed external air supplying step for supplying the mixed external air, in at least one of steps that use heated air and that are included in the carbon fiber producing step. Of the discharged gas, a high-heat-generation-amount discharged gas having a heat generation amount not less than 250 kcal/Nm3 is supplied to the inlet side of the discharged gas combustion device, and a low-heat-generation-amount discharged gas having a heat generation amount less than 150 kcal/Nm3 is supplied to the outlet side of the discharged gas combustion device. Accordingly, the present invention provides a method for economically producing carbon fibers by using the discharged gas combustion device having low energy loss.
Inventors:
TAKI KOSUKE (JP)
UEDA HIROOMI (JP)
KONISHI HIROYUKI (JP)
UEDA HIROOMI (JP)
KONISHI HIROYUKI (JP)
Application Number:
PCT/JP2018/009001
Publication Date:
December 20, 2018
Filing Date:
March 08, 2018
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/32
Domestic Patent References:
| WO2016117167A1 | 2016-07-28 |
Foreign References:
| JP2006308275A | 2006-11-09 | |||
| JP2009174078A | 2009-08-06 | |||
| JPS59142826A | 1984-08-16 | |||
| JP2012246598A | 2012-12-13 | |||
| JP2013032608A | 2013-02-14 | |||
| JP2006308275A | 2006-11-09 | |||
| JP2009174078A | 2009-08-06 |
Other References:
See also references of EP 3640379A4
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