Heat recovery steam generator and power plant
AssigneeKabushiki Kaisha Toshiba
InventorsKeiichi Nakamura, Hideaki Shimada
Life of this patent
Estimating the term…
Abstract
According to the embodiment of the present invention, there are provided a first stage auxiliary burner configured to heat up the exhaust gas in the upstream side of the superheater, a second stage auxiliary burner configured to heat up the exhaust gas in the upstream side of the evaporator, a fuel supply system configured to distribute fuel so as to be supplied to the first stage auxiliary burner and the second stage auxiliary burner. Distribution of fuel charged to each of the first stage auxiliary burner and the second stage auxiliary burner is controlled in accordance with a predetermined distribution ratio of each charging quantity to whole charging quantity in all the range thereof.
Claims6
A heat recovery steam generator in which a plurality of heat exchangers consisting of a superheater, an evaporator and an economizer are installed in a duct along a flow direction of exhaust gas from a gas turbine, so as to generate steam by utilizing the exhaust gas of the gas turbine, the heat recovery steam generator comprising:
- a first stage auxiliary burner configured to heat up the exhaust gas in the upstream side of the superheater;
- a second stage auxiliary burner configured to heat up the exhaust gas in the upstream side of the evaporator;
- a fuel supply system configured to distribute fuel so as to be supplied to the first stage auxiliary burner and the second stage auxiliary burner;
- and
- a fuel distribution control means configured to control distribution of fuel charged to each of the first stage auxiliary burner and the second stage auxiliary burner, in accordance with a predetermined distribution ratio of each charging quantity to whole charging quantity in all the range thereof.
A power plant comprising:
- a gas turbine configured to drive a turbine in rotation by combustion gas of high temperature and high pressure;
- a heat recovery steam generator in which a plurality of heat exchangers consisting of a superheater, an evaporator and an economizer are installed in a duct along a flow direction of an exhaust gas from the gas turbine, so as to generate steam by utilizing the exhaust gas of the gas turbine;
- a steam turbine configured to be driven by the steam generated by the heat recovery steam generator;
- and
- a generator configured to be driven by the gas turbine and the steam turbine;
- wherein the heat recovery steam generator includes:
- a first stage auxiliary burner configured to heat up the exhaust gas in the upstream side of the superheater;
- a second stage auxiliary burner configured to heat up the exhaust gas in the upstream side of the evaporator;
- a fuel supply system configured to distribute fuel so as to be supplied to the first stage auxiliary burner and the second stage auxiliary burner;
- and
- a fuel distribution control means configured to control distribution of fuel charged to each of the first stage auxiliary burner and the second stage auxiliary burner, in accordance with a predetermined distribution ratio of each charging quantity to whole charging quantity in all the range thereof.
Dependencies are inferred from the claim text.