Title:
BLAST FURNACE GAS MIXED FIRING COAL FIRED BOILER
Document Type and Number:
Japanese Patent JP3073434
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve a boiler efficiency, increase the safetiness of flue instruments and reduce the generating amount of NOx by a method wherein a blast furnace gas compartment is arranged between the thick mixture compartment of pulverized coal. and the thin mixture compartment of the same while respective compartments are provided with downward angles.
SOLUTION: In a lower coal/blast furnace gas combination stage 13, an AUX compartment 18, charging auxiliary combustion air, a thin mixture compartment 17, low in the concentration of pulverized cloal, a blast furnace gas compartment 16 and a thick mixture compartment 15, high in the concentration of pulverized coal, are arranged sequentially from the lowr part. On the other hand, an arrangement in an upper coal/blast furnace gas combination stage 11 is reversed to the arrangement in the lowr stage. Respective compartments of the coal/blast furnace gas combination stages 11, 13 are installed so as to have downward angles to elongate the staying period of time of respective fuels and air in a furnace 2. According to this method, the generating amount of NOx can be restrained in a low degree.
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Inventors:
Yuzo Taguchi
Application Number:
JP27889195A
Publication Date:
August 07, 2000
Filing Date:
October 26, 1995
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
F23C99/00; F22B35/00; F23D1/00; F23D17/00; (IPC1-7): F23C11/00; F22B35/00; F23C11/00; F23D1/00; F23D17/00
Domestic Patent References:
| JP5141617A | ||||
| JP5716703A | ||||
| JP3134403A | ||||
| JP3112615U |
Attorney, Agent or Firm:
Arata Ishikawa