Power plants – Combustion products used as motive fluid
Reexamination Certificate
1997-11-17
2001-06-19
Casaregola, Louis J. (Department: 3746)
Power plants
Combustion products used as motive fluid
C060S039463, C060S736000
Reexamination Certificate
active
06247299
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for feeding a gas turbine with both liquid and gaseous fuels.
2. Discussion of Background
Conventional gas turbines, if they are operated with both liquid and gaseous fuels, have separate feed paths for each type of fuel. For the combustion of gaseous fuel, premix burners are generally used, in which gaseous fuel is mixed with the combustion air in premixing zones and is combusted. If liquid fuel is used, it is injected into the premixing zone through one or more nozzles.
However, mixing of the injected fuel with the combustion air is insufficient, in particular because it is not possible to keep the droplet size sufficiently small. Moreover, the use of two separate feed paths is technically very complicated, without as a result improving the performance of the gas turbine. It has not to date been possible to use both types of fuel in a single feed system, since there are very different impulse ratios at the gas inlet into the combustion chamber with the same amount of power supplied, owing to the different volumetric calorific values of liquid and gaseous fuels.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide a novel method for producing identical volumetric calorific values with both gaseous and liquid types of fuel. A further object consists in providing an appliance for carrying out this method.
These objects are each achieved by the features of the defining portion of claim
1
and claim
5
, respectively. Advantageous embodiments of the method and advantageous embodiments of such an appliance are described by the features of the dependent claims.
Such a method has the advantage, in particular, that a common feed path can be used for both types of fuel, with the result that the design is simplified very considerably and, above all, the performance of the gas turbine can be increased. A further advantage of the invention is that the liquid fuel can be evaporated at lower temperature, and hence the risk of carbon deposition (coking) is reduced. Also, the density of the fuel-flushing gas mixture can be adjusted so that the penetration depth of the fuel jets is essentially the same for both types of fuel, i.e. so that the same impulse ratios can be generated. This results in the same premixing performance for both types of fuel. Moreover, the NO
x
emissions can be reduced. In addition, there is no risk of drops of fuel condensing on the burner wall, because the burner then only contains gaseous fuel.
REFERENCES:
patent: 2792058 (1957-05-01), Thomas et al.
patent: 3691762 (1972-09-01), Ryberg et al.
patent: 4025282 (1977-05-01), Reed et al.
patent: 4262482 (1981-04-01), Roffe et al.
patent: 4838029 (1989-06-01), Gleason et al.
patent: 5344306 (1994-09-01), Brown et al.
patent: 3043698A1 (1981-06-01), None
patent: 0019421A2 (1980-11-01), None
patent: 0 582 427 (1994-02-01), None
patent: 1566525 (1980-04-01), None
patent: 2064006 (1981-06-01), None
Buss Johannes
Dobbeling Klaus
Winkler Dieter
ABB Research Ltd.
Burns Doane Swecker & Mathis L.L.P.
Casaregola Louis J.
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