Heat recovery steam generator and power plant

摘要

A heat recovery steam generator has a plurality of heat exchangers, including superheaters 28, 30, an evaporator 32 and an economizer 34, disposed in a duct 27 along the flow direction of an exhaust gas 25 from a gas turbine 14, and generates steam by utilizing the exhaust gas 25 from the gas turbine 14. The heat recovery steam generator includes: auxiliary combustors 50, 52, each disposed upstream of one of the heat exchangers, for heating the exhaust gas by means of burners; and an air supply device for supplying air to the burners of the auxiliary combustor 52 from the outside of the duct.

主权项

1. A heat recovery steam generator, comprising:
a duct, in which an exhaust gas from a gas turbine is configured to flow; a superheater, an evaporator, and an economizer disposed in the duct along a flow direction of the exhaust gas; a first auxiliary combustor comprising a plurality of first burners, disposed upstream of the superheater; a second auxiliary combustor, comprising a plurality of second burners, disposed upstream of the evaporator; an air supply configured to supply air from an outside of the duct to the plurality of second burners, the air supply comprising a regulator configured to regulate an amount of the air to be supplied; a detector configured to detect a concentration of a harmful gas in the exhaust gas exhausted from the duct; and a controller configured to control the regulator based on the concentration detected with the detector.