Patent ID: 9551241
Date: 2017-01-24
CPC Classifications: C22B,F01K,F01N,F22B,Y02P

Claim:
1. A waste heat recovery power generation plant to be applied to a sintering facility including a sintering machine and a sintered-ore cooler, the waste heat recovery power generation plant comprising: a multi-stage type steam turbine including a high-pressure stage, an intermediate-pressure stage and a low-pressure stage and being joined to a power generator; a sintered-ore-cooler waste heat boiler configured to heat condensate of the multi-stage type steam turbine by introducing an exhaust gas of the sintered-ore cooler so as to generate hot water and steam; and a sintering-machine waste heat boiler configured to heat all of or a part of the hot water generated by the sintered-ore-cooler waste heat boiler by introducing a high temperature part of an exhaust gas of the sintering machine so as to generate steam, wherein: the steam generated by the sintered-ore-cooler waste heat boiler and the steam generated by the sintering-machine waste heat boiler are supplied to a high-pressure stage of the multi-stage type steam turbine; a temperature of the hot water to be supplied to the sintering-machine waste heat boiler is controlled such that a temperature of the exhaust gas at an exhaust-gas outlet of the sintering-machine waste heat boiler is maintained to be higher than an acid dew point; the sintered-ore-cooler waste heat boiler includes a first evaporator, a first superheater, a first economizer and a first steam drum; the sintering-machine waste heat boiler includes at least a second evaporator, a second superheater and a second steam drum; the first economizer is configured to heat the condensate of the multi-stage type steam turbine, and the heated hot water is supplied to the first steam drum and is directly or indirectly supplied to the sintering-machine waste heat boiler; and steam generated by the first evaporator and the first superheater and steam generated by the second evaporator and the second superheater are supplied to the high-pressure stage of the multi-stage type steam turbine, the waste heat recovery power generation plant further comprising a steam extractor configured to generate steam by means of heat of the hot water supplied from the first economizer of the sintered-ore-cooler waste heat boiler and configured to supply the generated steam to the multi-stage type steam turbine, wherein hot water discharged from the steam extractor is supplied to the sintering-machine waste heat boiler; the steam extractor includes a first stage flasher configured to supply steam to an intermediate-pressure stage of the multi-stage type steam turbine, and a second stage flasher configured to supply steam to a low-pressure stage of the multi-stage type steam turbine; the first economizer is configured to heat condensate of the multi-stage type steam turbine and returned hot water of the second stage flasher, and the heated hot water is supplied to the first stage flasher and the first steam drum; and hot water discharged from the first stage flasher is supplied to the second stage flasher and the sintering-machine waste heat boiler.