GAS-TURBINE POWER PLANT UTILIZING BLAST-FURNACE GAS AS FUEL

摘要

PURPOSE:To enable to obtain a required amount of electric power with a low running cost, by increasing the calorific value of blast-furnace gas by removing CO2 gas from the blast-furnace gas, and utilizing the calorie-increased blast-furnace gas as fuel for driving a gas turbine. CONSTITUTION:Blast-furnace gas 7 is carried into a compressor 4 from a conduit 8 for raising the pressure of the blast-furnace gas 7 by the compressor 4. Then, a part of the blast-furnace gas 7 is carried into a CO2 gas absorbing tank 5 via a conduit 9 while the remaining part of the gas 7 is supplied to a gas turbine 1 via a conduit 10. In the tank 5, only CO2 gas is removed from the gas 7, and CO2 gas 12 is recovered from a conduit 11. On the other hand, the compressed blast-furnace gas, the calorific value of which is increased by removal of CO2 gas, is introduced into the gas turbine 1 via a conduit 13. Air 14 is introduced into an air compressor 3 via a conduit 15 for compressing air 14 by the air compressor 3, and then the compressed air is supplied to the gas turbine 1 via a conduit 16. Further, exhaust gas of the gas turbine 1 is introduced into a waste-heat recovering boiler 6 via a conduit 18a while low-pressure steam is introduced into said tank 5 via a generator pipe 6b and a conduit 22.