Back to results
US 4,466,241 AGranted
Waste heat recovery boiler
AssigneeHitachi, Ltd.
InventorsTaiji Inui, Makoto Sasaki
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHitachi, Ltd.
InventorsTaiji Inui, Makoto Sasaki
Estimating the term…
A waste heat recovery boiler for generating steam by utilizing a flue gas discharged from a gas turbine as a heat source comprises an economizer for preheating feedwater by the flue gas, an evaporator for evaporating the preheated feedwater, and a superheater for generating a steam for driving a steam prime mover by heating the evaporated feedwater. The economizer, the evaporator and the superheater are successively arranged in the direction from a downstream side to an upstream side of flue gas passage. The evaporator itself is divided into two sections and an apparatus for removing NO.sub.x is provided in a space between the divided two sections of the evaporator in the flue gas passage to remove NO.sub.x from the flue gas. An NO.sub.x concentration of a flue gas discharged from a combined cycle power plant including the gas turbine can be stably abated at any of full and partial loads.
A waste heat recovery boiler comprising a gas passage for conducting a flue gas discharged from a gas turbine, an economizer for preheating feedwater by the flue gas, an evaporator for evaporating the preheated feedwater, and a superheater for generating steam for driving a steam prime mover by heating the evaporated feedwater, the economizer, the evaporator and the superheater being successively arranged in a direction from a downstream side to upstream side of the gas passage, characterized by dividing the evaporator into two sections in a zone in which a flue gas temperature is 300.degree. to 450.degree. C. in the gas passage, and providing an apparatus for removing NO.sub.x by a chemical reaction from the flue gas in a space in the gas passage between the two divided sections of the evaporator.
A waste heat recovery boiler comprising a gas passage means for conducting a flue gas discharged from a gas turbine to a venting stack, and evarporator means for evaporating preheated feedwater of the boiler, characterized in that the evaporator means is disposed in a zone of the gas passage means in which a temperature of the flue gas is between 300.degree. to 450.degree., the evaporator means includes a first evaporator section and a second evaporator section, said second evaporator section being disposed at a position spaced from and downstream of the first evaporator section, as viewed in a flow direction of the flue gas through the gas passage means, and in that means are disposed in the gas passage means in a space between the first and second evaporator sections for removing NO.sub.x by a chemical reaction from the flue gas flowing through the gas passage means.
Dependencies are inferred from the claim text.