METHOD FOR RECOVERING ENERGY FROM FURNACE TOP GAS OF BLAST FURNACE AND ITS RECOVERING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a method for recovering energy from furnace top gas of a blast furnace and its recovering apparatus with which the pressure and the heat energy held in the furnace top gas are recovered at high efficiency and a low cost and this apparatus can quickly correspond to a abnormal state such as a trip of a furnace top pressure turbine and dust is difficult to deposit in piping.;SOLUTION: A dust collector 3 is provided at the downstream side of the blast furnace 1 and further, a primary washing chamber 5 and a secondary washing chamber 6 as a wet-type dust collecting devices and a bag filter 11 as a dry-type dust collecting device, are parallel provided at the downstream side of the dust collector 3, and the furnace top gas in the blast furnace 1 passed through these wet-type collecting devices and dry-type dust collecting device, is introduced into the furnace top pressure turbine 16, and the pressure and the heat energy held in the furnace top gas in the blast furnace 1, are converted into the electric energy with the furnace top pressure turbine 16. The secondary washing chamber 6 has a water- sealing function, and when the bag filter 11 is operated, the secondary washing chamber 6 shuts off the passing of the gas to the downstream side with the water-sealing function, and the primary washing chamber 5 is passed through only the furnace top gas in the blast furnace used for gas for equalization in a furnace top charging facility and supplied into the blast furnace 1 through the piping 19.;COPYRIGHT: (C)2002,JPO