POWER GENERATING PLANT USING BLAST FURNACE GAS AS FUEL

摘要

PURPOSE:To improve plant efficiency and to prevent low temperature corrosion of a blast furnace gas heater, by arranging a blast furnace gas heater utilizing steam extracted from a turbine and a blast furnace gas heater utilizing of exhaust gas in series on a blasting furnace gas flow system. CONSTITUTION:Extracted steam from a turbine 2 is led to a blast furnace gas jeater 10 utilizing turbine extracted steam, which is load to a low pressure heater 5. Exhaust gas comes out of a coal economizer 13 and passes through an exhaust gas blast burnace gas heater 9 and reaches a stack 12 through an air preheater 11. In this manner, plant efficiency can be improved drastically and thermal energy to be thrown away to a condenser 3 and that of the exhaust gas can be recovered. Then, low temperature corrosion of a metal at the low temperature part of the exhaust gas blast furnace gas heater 9 can be avoided.