JPH03244906A - Coaxial injector for burner - Google Patents

Abstract

PURPOSE:To enable an accurate setting of a combustion gas temperature to be attained by a method wherein a flow rate of fuel is set by an orifice arranged on an external injector device constituting a coaxial injector device. CONSTITUTION:Fuel is supplied from a passage 5 and injected into a combustion chamber 9 through an orifice 4 arranged on an injector device 2. Ignition is carried out with an igniter 8, oxidization agent is supplied through a passage 6, injected into a combustion chamber 9 through an injector device 3 and then a hit combustion gas can be attained. The fuel is metered by an orifice which is machined under a high precision manner and of which hole area and shape are well controlled and so an accuracy of flow rare is high. Accordingly, an accuracy of combustion gas temperature is high. A flow rate of the gas can be varied by varying an area of on orifice hole, and a temperature of the combustion gas can also be varied. Arranging a hole at a forget position on the orifice 4 cause the fuel to be uniformly injected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coaxial type injector for a combustor used in a combustor for obtaining high-temperature combustion gas.

[Conventional technology]

In the conventional coaxial type injector for combustor, as described in the document "Study on small groove structure droplet water cooled combustor (1)", a circular injector consisting of an outer injector and an inner injector installed on the same axis is used. The fuel flow was restricted in the tubular gap. The specific structure is shown in Figure 3.

[Problem to be solved by the invention]

In the above conventional technology, the fuel flow rate is restricted in the circular gap between the outer injector and the inner injector. The problem is that the area is affected, the flow rate accuracy is poor, and it is difficult to control the combustion gas temperature. Also, when changing the flow rate by changing the orifice area and changing the combustion gas temperature setting,
The problem was more difficult due to the structural limitations of the outer and inner injectors.

The object of the present invention is to provide a fuel supply throttle (orifice) independently on the outer injector to improve flow rate accuracy and to adequately control combustion gas temperature.

Furthermore, the aim is to accurately respond to changes in fuel flow rate and combustion gas temperature by changing the throttle area provided independently on the outer injector.

[Means to solve the problem]

In order to achieve the above object, a separate fuel supply throttle (orifice) is provided on the coaxial outer injector to improve the flow rate accuracy and to sufficiently control the combustion gas temperature.

Furthermore, a fuel supply throttle (orifice) is provided independently on the outer injector to accommodate changes in fuel flow rate and combustion gas temperature.

[Effect]

By setting the fuel flow rate using an orifice provided on the outer injector constituting the coaxial type injector, the combustion gas temperature can be set with high accuracy. Furthermore, by changing the orifice hole area, it is possible to change the setting of the combustion gas temperature.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is the combustor main body. Fuel is supplied from passage a5 and is injected into combustion chamber 9 through orifice 4 provided on injector (outside) 2. Ignition is made with the igniter 8,
The oxidizing agent is supplied from the passage b6 and injected into the combustion chamber 9 via the injector (inside) 3 to obtain high-temperature combustion gas.

The fuel is squeezed through an orifice that is precisely machined and has a well-controlled hole area and shape, resulting in higher flow rate accuracy. Therefore, the combustion gas temperature accuracy becomes high. Furthermore, by changing the orifice hole area, the flow rate can be changed and the combustion gas temperature can also be changed. By providing holes at symmetrical locations on the orifice 4, the fuel is uniformly injected.

In the above example, the fuel is in the passage a5. From orifice 4, oxidized passage b6. Although the case where fuel is supplied from the injector (inner) 3 has been described, fuel and oxidized fuel can also be supplied from the opposite passage.

Further, although FIG. 2 shows a case with one coaxial injector, the same applies to a combustor configured with a plurality of coaxial injectors.

〔Effect of the invention〕

As described above, according to the present invention, since the flow rate of fuel can be set at the orifice, the combustion gas temperature of the combustor can be easily set within ±1%.

Furthermore, since the area of the orifice can be changed, the combustion gas temperature can be changed with an accuracy of ±1%.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view showing an embodiment of the present invention, Fig. 2 is a longitudinal side view showing an example of a combustor using a coaxial type injector according to the present invention, and Fig. 3 is a longitudinal side view showing an example of a combustor using a coaxial type injector according to the present invention. It is a longitudinal side view showing an example of a container. 2... Injector (outside), 3... Injector (inside), 4... Ori $ 1 mouth (brown 3 figure)

Claims (1)

[Claims] 1. A coaxial injector consisting of an outer injector and an inner injector, characterized in that the flow rate of fuel or oxidized fuel is set by an orifice provided on the outer injector. A handy coaxial injector. 2. In a coaxial type injector consisting of an outer injector and an inner injector, a fuel or oxidized flow rate setting value is changed by changing the six areas of the orifice provided on the outer injector. Coaxial type injector.