Power plants – Combustion products used as motive fluid – Combustion products generator
Reexamination Certificate
2002-07-16
2004-03-09
Gartenberg, Ehud (Department: 3746)
Power plants
Combustion products used as motive fluid
Combustion products generator
C060S748000
Reexamination Certificate
active
06701713
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pilot burner, a premixing combustor, and a gas turbine that generate a stable flame.
BACKGROUND OF THE INVENTION
FIG. 8
depicts a pilot burner and a main burner of a premixing combustor in a conventional gas turbine. A pilot burner
70
consists of an outer cylinder
71
, a pilot swirler
72
, a pilot nozzle
73
and a pilot cone
74
. Fuel is injected and diffused in the premixing combustor, as shown by black arrows
75
, from the pilot nozzle
73
. A plurality of premixing nozzles
76
those inject premixed gas are provided around the pilot nozzle
73
. This fuel injected from the pilot nozzle
73
is burnt in the form of a flame and this flame helps combust the premixed gas injected from the premixing nozzles
76
.
Pilot air is made to flow from left (“upstream”) to right (“downstream”) as shown by white arrows. The pilot swirler
72
functions to circulate the pilot air around the pilot nozzle
73
to improve the combustion efficiency. The pilot swirler
72
surrounds the pilot nozzle
73
. However, the pilot swirler
72
is not directly attached to the pilot nozzle
73
but arranged towards the side of the outer cylinder
71
.
The combustion of the premixed gas is conducted at a high temperature of about 1500 degree centigrade to suppress generation of toxic thermal NOx gas. However, the combustion of the fuel is conducted at relatively low temperature. As a result, thermal NOx is disadvantageously generated during the combustion of the fuel.
The amount of thermal Nox generated may be reduced by reducing the amount of the fuel. However, if the fuel reduced, the flame obtained by burning the fuel becomes unstable. In the worst case the flame may be extinguished because of the blow of the pilot air. Since this flame has a great influence on the combustion of the premixed gas, it is preferable that the flame is stable and does not extinguish.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a stable flame.
According to a pilot burner of one aspect of the present invention, a pilot nozzle diffusion-injects a fuel, a pilot swirler swirls a pilot air around the pilot nozzle, an air guide is arranged between the outer surface of the pilot nozzle and the pilot swirler. The air guide extends from the pilot swirler to a tip of the pilot nozzle. The air guide has a tip that protrudes beyond the tip of the pilot nozzle and this the tip of the air guide is bent away from a center of the pilot nozzle.
According to a pilot burner of one aspect of the present invention, a pilot nozzle diffusion-injects a fuel, a pilot swirler swirls a pilot air around the pilot nozzle, an air guide is arranged between the outer surface of the pilot nozzle and the pilot swirler. The air guide extends from the pilot swirler to a tip of the pilot nozzle. The air guide has a tip that protrudes beyond the tip of the pilot nozzle and this the tip of the air guide is bent radially with respect to a center of the pilot nozzle.
The premixing combustor according another aspect of the present invention is provided with the pilot burner according to the present invention.
The gas turbine according still another aspect of the present invention is provided with the pilot burner according to the present invention.
Other objects and features of this invention will become apparent from the following description with reference to the accompanying drawings.
REFERENCES:
patent: 5394688 (1995-03-01), Amos
patent: 5901555 (1999-05-01), Mandai et al.
patent: 2002/0011070 (2002-01-01), Mandai et al.
patent: 2003/0110774 (2003-06-01), Saitoh
patent: 2001-254947 (2001-09-01), None
Akizuki Wataru
Mandai Shigemi
Matsuura Masaaki
Saitoh Keijirou
Tanaka Katsunori
Gartenberg Ehud
Mitsubishi Heavy Industries Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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