BYPASS OPERATION METHOD FOR BLAST FURNACE GAS RECOVERY DEVICE AND BLAST FURNACE TOP PRESSURE RECOVERY TURBINE

摘要

PURPOSE: To provide a bypass operation device which is constituted to collect and purify dust in blast furnace gas by a dry type dust collector when a furnace top pressure recovery turbine and/or a generator is tripped and protect equipment situated downstream of blast furnace gas main pipe from a high heat and to provide an operation method. ;CONSTITUTION: Blast furnace gas is guided to a bypass pipe 4 and by regulating a cooling water amount of a cooling mechanism 3, the blast furnace gas is cooled to a preset temperature. A pressure is reduced to a value at which blast furnace gas is prevented from a reverse flow from a downstream blast furnace gas main pipe 10 and the gas is recovered to the blast furnace gas main pipe 10, whereby equipment installed downstream of the blast furnace gas main pipe is protected from a high heat. Since, after repair of trip, a furnace top pressure recovery turbine 6 is started by means of blast furnace gas freed from dust and purified by a dry type dust collector and having high energy, recovery efficiency of fed energy is improved.;COPYRIGHT: (C)1995,JPO