Steam turbine plant
First Claim
1. A steam turbine plant, comprising:
- a boiler that generates steam,wherein the boiler utilizes coal to generate the steam;
a steam turbine driven by the steam generated in the boiler;
a feedwater system that recovers the steam exhausted from the steam turbine and supplies the steam to the boiler as feedwater;
a superheating combustor provided between the boiler and the steam turbine,wherein fuel originated from a hydrocarbon fuel and an oxidizer are mixed with the steam generated in the boiler and combusted in the superheating combustor to increase the temperature of the steam; and
a fuel controller which controls a quantity of heat of the hydrocarbon fuel up to about 40 percent of a total heat quantity of the fuel and the coal utilized in the plant.
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Accused Products
Abstract
A steam turbine plant partially utilizes a hydrocarbon fuel such as an LNG as a fuel to improve the efficiency of the plant. A steam turbine plant includes a boiler, a steam turbine, a feedwater system, and a superheating combustor. The boiler generates steam, and the steam turbine is driven by the steam generated in the boiler. The feedwater system recovers the steam exhausted from the steam turbine and supplies the steam to the boiler as a feedwater. The superheating combustor is provided between the boiler and the steam turbine, wherein fuel originated from hydrocarbon fuel and oxidizer are mixed with the steam generated in the boiler and combusted in the superheating combustor to increase the temperature of the steam.
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Citations
23 Claims
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1. A steam turbine plant, comprising:
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a boiler that generates steam, wherein the boiler utilizes coal to generate the steam; a steam turbine driven by the steam generated in the boiler; a feedwater system that recovers the steam exhausted from the steam turbine and supplies the steam to the boiler as feedwater; a superheating combustor provided between the boiler and the steam turbine, wherein fuel originated from a hydrocarbon fuel and an oxidizer are mixed with the steam generated in the boiler and combusted in the superheating combustor to increase the temperature of the steam; and a fuel controller which controls a quantity of heat of the hydrocarbon fuel up to about 40 percent of a total heat quantity of the fuel and the coal utilized in the plant. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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7. A steam turbine plant, comprising:
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a boiler that generates steam; a steam turbine driven by the steam generated in the boiler; a feedwater system that recovers the steam exhausted from the steam turbine and supplies the steam to the boiler as feedwater, wherein the feedwater system includes a steam condenser connected to the steam turbine; a superheating combustor provided between the boiler and the steam turbine, wherein fuel originated from a hydrocarbon fuel and an oxidizer are mixed with the steam generated in the boiler and combusted in the superheating combustor to increase the temperature of the steam; and a compressor coupled with the steam condenser which separates noncondensing gas from the steam condenser.
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22. In a steam turbine plant having a boiler that generates steam, a steam turbine driven by the steam generated in the boiler which utilizes coal, a feedwater system that recovers the steam exhausted from the steam turbine and supplies the steam to the boiler as a feedwater;
- a method for operating said steam turbine plant comprising;
feeding said steam from said boiler to a superheating combustor; feeding a hydrocarbon fuel and an oxidizer to said superheating combustor; controlling a quantity of heat of the hydrocarbon fuel up to about 40 percent of a total heat quantity of the fuel and the coal utilized in the plant; combusting said hydrocarbon fuel and said oxidizer in said superheating combustor with said steam from said boiler to produce super high temperature steam; and
,feeding said super high temperature steam to said steam turbine.
- a method for operating said steam turbine plant comprising;
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23. In a steam turbine plant having a boiler that generates steam, a steam turbine driven by the steam generated in the boiler, a feedwater system that recovers the steam exhausted from the steam turbine and supplies the steam to the boiler as a feedwater;
- a method for operating said steam turbine plant comprising;
feeding said steam from said boiler to a superheating combustor; feeding a hydrocarbon fuel and an oxidizer to said superheating combustor; combusting said hydrocarbon fuel and said oxidizer in said superheating combustor with said steam from said boiler to produce super high temperature steam; feeding said super high temperature steam to said steam turbine; recovering the steam exhausted from the steam turbine in a steam condenser; and compressing noncondensing gas which is separated from the steam condenser.
- a method for operating said steam turbine plant comprising;
Specification