Blast Furnace Gas Top Pressure Recovery Turbine Jun24

Blast Furnace Gas Top Pressure Recovery Turbine...

Blast Furnace Gas Top Pressure Recovery Turbine  Modern blast furnaces in steel plants operate at a high top gas pressure. The blast furnace (BF) gas leaving the BF at the top still maintain a pressure of around 1.6 kg/sq cm (g) to 3 kg/sq cm (g) and has a temperature of around 200 deg C.  This BF gas which is coming out at the top of a BF is cleaned to remove dust and the cleaned gas is used in the steel plant as a fuel for heating purpose at a relatively low pressure. In the process, a large amount of pressure energy is lost across the valve. BF gas top pressure recovery turbine (TRT) is a mechanism that utilizes the BF gas heat and pressure energy to drive a turbine.  The work generated by the turbine is transferred to a generator and converted to electric power. TRT generates power by exploiting a known property of all gases which is the expansion of gas volume with the reduction of its pressure. The system comprises dust collecting equipment, a gas turbine, and a generator. TRT is basically an energy saving measure at the BF which utilizes the waste pressure energy of the BF top gas to generate electric power. A TRT unit can produce around 15 to 60 kWh/t of hot metal (HM). Its output can meet around 30 % of the power needed by the all equipment (including the air blower) of the BF. The BF gas leaving the TRT unit can still be used as fuel in the steel plant. During iron making process, BF gas with high pressure and temperature is produced in blast furnace. In conventional practice, the energy of BF gas is wastage by pressure reduction at septum valve. Equipping TRT...