REDUCING GAS HEATING METHOD AND DEVICE THEREFOR

Japanese Patent JP3889827

B2

PROBLEM TO BE SOLVED: To prevent the reduction in thickness caused by carbon deposition on the inner surface of a gas heating pipe and carburization-embrittlement of the heating pipe by rapidly heating at the temp. raising velocity having a prescribed value or higher in the dangerous temp. range easily depositing the carbon from a CO-containing reducing gas.
SOLUTION: At the time of heating the reducing gas containing CO, the carbon is deposited by reaction 2CO←→CO2+C. This deposited carbon is stuck onto the heating pipe and reacts with iron, and carburizing phenomenon is caused and the inner surface is embrittled and worn. This reaction is exothermic reaction, and according to the chemical equilibrium theory, the reaction is progressed to the right side as the temp. becomes lower, the carbon is easily deposited but on the other hand, since the reaction velocity is not high in the low temp., the dangerous temp. zone easily depositing the carbon exists. This range depends on the gas composition (particularly CO and CO2 concns.) and the operation pressure, but, this temp. is generally not over about 350°C, at the time of heating this gas at ≥1000°C/sec temp. raising velocity, since the staying time of the gas is extremely short, such as ≤0.35sec, the deposition of the carbon is effectively restrained.

Takaaki Mouri
Ryosuke Shimizu
Yasumasa Morita

JP516096A

March 07, 2007

January 16, 1996

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Chiyoda Kakoh Construction Co., Ltd.

C01B32/50; C21B9/00; C21B9/08; F27B3/20; (IPC1-7): C21B9/00; C21B9/08; //C01B31/20

JP4341509A
JP53102817A
JP51117967A
JP55028395A

Masao Okabe
Yoshio Inoue
Nobuaki Kato
Shinichi Usui
Ikuo Fujino
Takao Ochi
Teruhisa Motomiya
Norimichi Takanashi
Asahi Shinmitsu

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