This system generates electric power by employing the heat and pressure of blast furnace top gas to drive a turbine generator. After the blast furnace gas is used in power generation, it is used as a fuel in iron and steel manufacturing processes. Blast fumace gas (BFG) has a pressure of 0.2-0.236 MPa (2-2.41 kg/cm2) and temperature of approx. 200 C at the fumace top.
The system comprises dust collecting equipment, a gas turbine, and a generator. Generating methods are classified as (1)wet or (2)dry depending on the BFG purification method. Dust is removed by Venturi scrubbers in the wet method and by a dry-type dust collector in the dry method. When dust is treated by the dry method, the gas temperature drop is small in comparison with the wet method, and as a result, generated output is at maximum 1.6 times geater than with the wet method
- Fuel savings: 50 kWh/t-pig iron
- CO2 Reduction: 45.0 kg-CO2/t-pig iron
Excellent operational reliability, abrasion resistant
A pressure of 0.2-0.236 MPa (2-2.41 kg/cm2) and temperature of approx. 200 C at the fumace top
- Equipment cost: JPY 1400 million (7MW)
- Construction cost: JPY 400 million
- Payback time: 3.6 years