596
H. Nakano et al.
Fig. 2 Mist spraying system
Mist Spraying System Around Blast Furnace
Mist spray system was selected to collect fumes and dusts around the blast furnace.
Foamed mist is sprayed around the blast furnace, and the suspended fumes and dusts
are collected by the mist.
The system is shown in Fig. 2.
Spray solution and compressor air are sprayed through mist nozzles. Spray solution is a mixture of a chemical solution containing a surfactant and water. As the
surfactant improves wettability of the dusts, the dusts can be collected efficiently
with a small amount of water. And the floor around furnaces is kept dry.
Improvement of Hoods of Short Rotary Furnaces
Hoods over short rotary furnaces were improved as a countermeasure against leakage
of fumes and dusts. On implementing relocation of the short rotary furnaces to a new
plant, which is one of the items of the 10-year future plan, the hoods were newly
designed and installed. The hood of short rotary furnace is shown in Fig. 3.
Each front area of the short rotary furnaces is completely covered with a hood to
prevent from leakage of exhaust gas from the furnace. The shutter is opened only
when the raw materials are charged and the products are discharged, and it is closed
during blowing and holding periods.
Results
Owing to those countermeasures, the dust concentration in the working environment
around the blast furnace and the rotary furnaces could be much reduced. In addition,
H. Nakano et al.
Fig. 2 Mist spraying system
Mist Spraying System Around Blast Furnace
Mist spray system was selected to collect fumes and dusts around the blast furnace.
Foamed mist is sprayed around the blast furnace, and the suspended fumes and dusts
are collected by the mist.
The system is shown in Fig. 2.
Spray solution and compressor air are sprayed through mist nozzles. Spray solution is a mixture of a chemical solution containing a surfactant and water. As the
surfactant improves wettability of the dusts, the dusts can be collected efficiently
with a small amount of water. And the floor around furnaces is kept dry.
Improvement of Hoods of Short Rotary Furnaces
Hoods over short rotary furnaces were improved as a countermeasure against leakage
of fumes and dusts. On implementing relocation of the short rotary furnaces to a new
plant, which is one of the items of the 10-year future plan, the hoods were newly
designed and installed. The hood of short rotary furnace is shown in Fig. 3.
Each front area of the short rotary furnaces is completely covered with a hood to
prevent from leakage of exhaust gas from the furnace. The shutter is opened only
when the raw materials are charged and the products are discharged, and it is closed
during blowing and holding periods.
Results
Owing to those countermeasures, the dust concentration in the working environment
around the blast furnace and the rotary furnaces could be much reduced. In addition,