Waste-heat steam generator
AssigneeSiemens Aktiengesellschaft
InventorsHermann Br{umlaut over (u)}ckner, Werner Schwarzott, Helmut Stierstorfer
Life of this patent
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Abstract
For achieving a high plant efficiency, a waste-heat steam generator, in particular for a combined-cycle power plant, has a number of heating surfaces heatable by a flue gas and carrying a medium to be heated. The steam generator can be operated at critical or supercritical pressures and has a once-through evaporator connected in countercurrent to the flue gas provided on a medium side. The evaporator is followed by a preheater and preceded by a superheater on a flue-gas side.
Claims16
A waste-heat steam generator, comprising:
- a number of heating surfaces heatable by a flue gas and carrying a medium to be heated, said number of heating surfaces including:
- an evaporator having an inlet side, an outlet side and evaporator tubes;
- a preheater following said evaporator on a flue gas side;
- and
- a superheater preceding said evaporator on the flue gas side, said preheater, said evaporator and said superheater disposed on a medium side in countercurrent to the flue gas;
- an inlet distributor connecting said evaporator on said inlet side to said preheater;
- a throttle configuration connecting each of said evaporator tubes to said inlet distributor;
- and
- a pressure-equalizing header in a form of an equalizing tube connected to said evaporator.
A once-through waste-heat steam generator, comprising:
- a number of heating surfaces heatable by a flue gas and carrying a medium to be heated, said number of heating surfaces including:
- an evaporator having an inlet side, an outlet side and evaporator tubes;
- a preheater following said evaporator on a flue gas side;
- and
- a superheater preceding said evaporator on the flue gas side, said evaporator, said preheater and said superheater disposed on a medium side in countercurrent to a flue gas flow;
- an inlet distributor connecting said evaporator on said inlet side to said preheater;
- a throttle configuration connecting each of said evaporator tubes to said inlet distributor;
- and
- a pressure-equalizing header in a form of an equalizing tube connected to said evaporator.
A waste-heat steam generator for a combined-cycle power plant, comprising:
- a number of heating surfaces heatable by a flue gas and carrying a medium to be heated, said number of heating surfaces including:
- an evaporator having an inlet side, an outlet side and evaporator tubes;
- a preheater following said evaporator on a flue gas side;
- and
- a superheater preceding said evaporator on the flue gas side, said evaporator, said preheater and said superheater disposed on a medium side in countercurrent to a flue gas flow;
- an inlet distributor connecting said evaporator on said inlet side to said preheater;
- a throttle configuration connecting each of said evaporator tubes to said inlet distributor;
- and
- a pressure-equalizing header in a form of an equalizing tube connected to said evaporator.
Dependencies are inferred from the claim text.