Control of CO_2 Peak Position by Dual Lance Air Curtain Method
スポンサーリンク
概要
- 論文の詳細を見る
A phenomenon that a CO2 peak position or temperature peak position of combustion (CO⊃2; or temperature peak position) in the raceway of blast furnace approaches a tuyere in step with the increase of pulverized coal rate (PCR) changes a gas flow at the lower part of the furnace into a peripheral flow or lowers the temperature at the raceway end, which may be one of the factors making the furnace operation unstable. Therefore, a pulverized coal combustion method (dual lance air curtain method) which interrupts temporarily a contact of pulverized coal and hot air in the vicinity of lance tip by injecting cold air through an opening between inner and outer tubes of the dual lance was examined by performing a hot model experiment and a single tuyere test of actual furnace. The hot model experiment results have revealed that with the increase of the flowing velocity of cold air sent from the outer tube of dual lance, the temperature around the tuyere tip falls and the temperature ranging from the raceway and to a dead man surface rises. According to the examination results of gas temperature under the raceway conditions of actual furnace with the use of onedimensional raceway model, an estimated value of the moving distance of CO⊃2; or temperature peak position of combustion toward the dead man side is 480 mm when the dual lance air curtain method has been taken this time at Kimitsu No. 2 blast furnace. The combustion efficiency of pulverized coal could decrease due to movement of CO⊃2; or temperature peak position of combustion to the dead man side. And in the actual furnace test conducted this time with a single tuyere, the increase range of unburnt char ratio at the inside of dead man is as small as less than 1% relative to -1 mm fine and the packing structure of dead man surface has been improved.
- 社団法人 日本鉄鋼協会の論文
- 2002-10-15
著者
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Ueno Hiromitsu
Kimitsu Works Nippon Steel Corp.
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Kakiuchi Kazumoto
Kimitsu Works Nippon Steel Corp.
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ICHIDA Morimasa
Environment & Process Technology Center
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Kunitomo Kazuya
Environment & Process Technology Center Nippon Steel Corp.
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Kunitomo Kazuya
Environment & Process Technology Center
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NISHIMURA Tsunehisa
Environment & Process Technology Center, Nippon Steel Corp.
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SAKATANI Masatoshi
Kimitsu Works, Nippon Steel Corp.
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Sakatani Masatoshi
Kimitsu Works Nippon Steel Corp.
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Ichida M
Environment & Process Technology Center Nippon Steel Corp.
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Nishimura Tsunehisa
Environment & Process Technology Center Nippon Steel Corp.
関連論文
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- Effect of Chute Angle on Charging Behavior of Sintered Ore Particles at Bell-less Type Charging System of Blast Furnace by Discrete Element Method
- Validation of Particle Size Segregation of Sintered Ore during Flowing through Laboratory-scale Chute by Discrete Element Method
- Activation of Deadman State in Blast Furnace Using Deadman Blowing Method
- Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties
- Desulfurization Technology in the Blast Furnace Raceway by MgO-SiO_2 Flux Injection
- Control of CO_2 Peak Position by Dual Lance Air Curtain Method
- Enhancement of Low-temperature Gasification and Reduction by Using Iron-coke in Laboratory Scale Tests
- Activation of Deadman State in the Blast Furnace Using Serpentine Injection through Tuyere
- Behavior of Pulverized Coal Ash and Physical Property of Dripping Slag under High Pulverized Coal Injection Operation