EXHAUSTS GAS TREATMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent ash from adhering to the surface of a heat transfer tube of a heat exchanger arranged on the inlet side of a dust collector.

SOLUTION: This system includes: a steam circulation line 17 for supplying steam generated in a steam generating heat exchanger 13 of a boiler 11 to a steam turbine 15, cooling exhaust gas from the steam turbine and returning the cooled gas to the steam generating heat exchanger; an exhaust gas treatment line 19 for treating the gas from the boiler; an exhaust gas circulation duct 21 for returning a part of the exhaust gas to the boiler; a first heat exchanger 29 for exchanging heat between water discharged from a condenser in the steam circulation line and a heating medium (a); a second heat exchanger 63 for compressing exhaust gas flowing in the downstream side of a dust collector 37 in the exhaust gas treatment line and exchanging heat between heated exhaust gas and the heating medium (a); and a third heat exchanger 35 for exchanging heat between exhaust gas flowing in the inlet side of the dust collector in the exhaust gas treatment line and the heating medium (a). The heating medium cooled by the first heat exchanger is heated by the second heat exchanger and further heated by the third heat exchanger and the heated heating medium is returned to the first heat exchanger.

COPYRIGHT: (C)2012,JPO&INPIT