JPS5969625A - Combustor - Google Patents

Abstract

PURPOSE:To contrive the reduction of a pressure loss as well as the increase of a combustion efficiency and elongate the life of a catalyst by a method wherein the diameter of a linear for the combustor, having air holes for supplying pre- mixture, is made larger than the same of parts before and after the combustor. CONSTITUTION:Pilot fuel, supplied from a fuel nozzle 101, is burnt by the air entering through the air holes 102. On the other hand, the fuel, supplied from the fuel nozzles 103 is mixed with the air entering through the air holes 104, thereafter, flows through the combustion catalyst 105 and is burnt. Then, combustion gas flows into a turbine (not shown in the diagram) through a tail tube 106. Here, the diameter of the linear for the combustor, provided with the air holes 104, is made larger than the diameters of the parts before and after the combustor. According to this method, the diameter Dc of the core of air jet may be enlarged since the number of the air holes, provided on the linear, may be increased and the diameter Do of the linear is enlarged. Accordingly, the pre- mixture may be flowed through the catalyst uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustor such as a gas turbine or a jet engine.

An example of a conventional type of combustor will be outlined with reference to FIGS. 1 and 2.

The pilot fuel supplied from the fuel nozzle 1 old is combusted by the air flowing in from the air hole 102.

On the other hand, the fuel supplied from the fuel nozzle 103 is
After mixing with the air flowing in from 4, the air flows into the combustion catalyst 105 and is combusted. Then, it flows into the turbine (not shown) through the transition piece 106.

In such a combustor, air holes 104 are provided as shown in FIG.
The premixture of fuel and air flowing from the combustor is supplied to the center of the combustor due to its penetrating power. Therefore, the combustion catalyst 10
5 and is supplied only to the center of the combustor, resulting in a low catalyst utilization rate.

In such cases, pressure loss increases, combustion efficiency decreases,
There are disadvantages such as a temperature difference between the center and the periphery of the catalyst, which can damage the catalyst.

The present invention is proposed to solve the above-mentioned problems of the conventional combustor, and aims to prevent the above-mentioned drawbacks by increasing the utilization rate of the catalyst by uniformly flowing the premixed gas into the catalyst layer. purpose.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5.

One embodiment of the invention is shown in FIG.

The pilot fuel supplied from the fuel nozzle 10 is combusted by the air flowing in from the air hole 102.

On the other hand, the fuel supplied from the fuel nozzle 103 is
After mixing with the air flowing in from 04, the combustion catalyst 105
flows into and burns. Then, it flows into the turbine (not shown) through the transition piece 106.

Here, the diameter of the combustor liner in which the air holes 104 are provided is made larger than the diameters before and after it.

FIG. 5 shows another embodiment of the shape of the combustor liner, and the shape of the combustor liner is not limited to the illustrated shape as long as the diameter of the combustor liner is larger than the diameter of the front and rear.

Next, the effects of the combustor according to the present invention will be described.
The ratio of the core diameter DC of the air jet shown in the figure to the diameter Do of the liner provided with air holes increases as the number n of air holes increases. As the number of air holes increases,
(b)! Additionally, by increasing the liner diameter Do, the core diameter Dc of the air jet becomes larger. That is, it becomes possible to uniformly flow the premixed air into the catalyst.

With these, (b) Pressure loss decreases.

(b) Combustion efficiency increases.

(c) The temperature of the catalyst layer becomes uniform, no thermal stress is generated within the catalyst, and the life of the catalyst is extended.

It is possible to achieve effects such as

[Brief explanation of the drawing]

1 and 2 show a conventional combustor, FIG. 1 is a side view, FIG. 2 is a sectional view showing the flow of premixture, FIGS. 3 to 5 relate to the present invention, and FIG. 4 is a side view of one embodiment, FIG. 4 is a sectional view showing one aspect of the configuration, and FIG. 5 is a side view of another embodiment. 101, 103 ・Fist fuel nozzle, 102, 104
・Fist air hole, 105... Combustion catalyst.

Claims (1)

[Claims] A combustor characterized in that the diameter of a combustor liner having an air hole for supplying a premixture is larger than the diameter of litchi before and after the combustor liner.