JPH08270908A - Spray combustor - Google Patents

Abstract

PURPOSE: To provide a spray combustor wherein a combustion flame is prevented from being lifted while keeping satisfactory firing performance with a firing rod, and cooling of a flame detector, and hence combustion performance is kept satisfactory. CONSTITUTION: A spray introduction hole 12 is provided at the center of a base end surface 11 of a combustion cylinder 10, around which a turning blade 30 is provided. A spray nozzle 20 is directed to face the spray introduction hole 12 frontally. A first air chamber A is constructed so as to surround the spray nozzle 20. A flame detector 50 is provided in a first air chamber A, and a second air chamber B is provided between a slanting front surface 61 of the first air chamber A and the base end surface 11 of the combustion cylinder 10. A sprayed fuel from the spray nozzle 20 is introduced into the combustion cylinder together with a first air stream from the first air chamber A through the frontal spray introduction hole 12. A second air stream from the second air chamber B is introduced into the combustion chamber 10 through the turning blade 30 for combustion. In the combustor, there is further provided a centripetal air blowoff outlet 100 in the second air chamber B where air flows in the centripetal direction from the surroundings with respect to the first air stream.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray combustor for spraying fuel into a combustion cylinder and introducing air for combustion into the combustion cylinder for combustion.

[0002]

2. Description of the Related Art A conventional spray combustor will be described with reference to FIG. A spray introduction port 12 for introducing the spray fuel is provided at the center of the base end surface 11 of the combustion cylinder 10, and a spray nozzle 20 faces the center axis X of the combustor in front of the spray introduction port 12. A swirl vane 30 is provided around the spray introduction port 12. 13
Are air holes provided on the side peripheral wall of the combustion cylinder 10. In the vicinity of the spray nozzle 20, a flame detector 50 including an ignition rod 40 and CdS, etc.
Is provided. And these spray nozzles 20, ignition rods
A first air cylinder 60 is provided so as to surround the flame detector 40 and the flame detector 50, and the inside is a first air chamber A. The tip peripheral edge of the inclined front surface portion 61 of the first air cylinder 60 forming the first air chamber A is connected and fixed to the peripheral edge of the spray introduction port 12. A second air cylinder 70 is provided so as to surround a space between the base end surface 11 of the combustion cylinder 10 and the inclined front surface portion 61 of the first air cylinder 60. The space in the second air cylinder 70 is a second air chamber B. Further, an outer cylinder 80 is provided surrounding the combustion cylinder 10, the first air cylinder 60, and the second air cylinder 70, and a blower fan 90 is connected to the outer cylinder 80. Part of the air blown from the blower fan 90 into the outer cylinder 80 is an air inlet 62 of the first air cylinder 60.
From the first air chamber A to a part of the second air cylinder 70
Enters the second air chamber B from the air inlet 71 of
It is directly introduced into the combustion cylinder 10 through the air holes 13 provided in the side peripheral wall of the. The air that has entered the first air chamber A is the flame detector 50.
After being cooled, it is introduced into the combustion cylinder 10 from the periphery of the spray nozzle 20 together with the spray fuel through the front spray introduction port 12. The air that has entered the second air chamber B is the swirl vane.
It is introduced as a swirling flow into the combustion cylinder 10 through 30.

[0003]

However, in the above conventional spray combustor, in order to favorably cool the flame detector 50 and to extend the arc by the ignition rod 40 to improve the ignition performance, the first Since a relatively large amount of air was introduced into the air chamber A, the flow rate and the flow velocity of the air flowing from the periphery of the spray nozzle 20 through the spray introduction port 12 and the spray fuel into the combustion cylinder 10 are increased. There are problems that the flame lifts, the amount of penetrating air in the combustion cylinder 10 increases, and the combustion performance deteriorates.

In view of the above, the present invention solves the above-mentioned drawbacks of the conventional device, improves the ignition performance of the ignition rod, maintains the cooling of the flame detector in a good state, and prevents the lift of the combustion flame. An object of the present invention is to provide a spray combustor capable of maintaining good performance.

[0005]

In order to achieve the above object, the spray combustor of the present invention is provided with a spray inlet for introducing spray fuel at the center of the base end surface of a combustion cylinder and a swirl vane around the spray inlet. A spray nozzle is provided in front of the spray inlet of the combustion cylinder, a first air chamber is formed so as to surround the spray nozzle, and a flame detector is provided in the first air chamber, and the first air chamber is provided. A second air chamber is provided between the inclined front surface of the fuel cell and the base end surface of the combustion tube, and the spray fuel from the spray nozzle is first
The second air from the second air chamber is introduced together with the first air flow from the air chamber into the combustion cylinder through the front spray introduction port.
A spray combustor in which an air flow is introduced into a combustion cylinder via the swirl vanes to perform combustion, and is provided in the second air chamber in a centripetal direction from the periphery with respect to the first air flow. It is characterized by the provision of flowing centripetal air outlets.

[0006]

According to the above feature of the present invention, the centripetal air flow blown out from the centripetal air blowing port of the second air chamber is different from the first air flow passing around the atomizing nozzle and traveling forward. , Flows in a centripetal direction so as to go straight from the surroundings. According to the flow of the centripetal airflow, the first air flow tends to flow forward.
The straight flow component of the air flow is appropriately suppressed in its flow rate and momentum, and as a result, the lift phenomenon of the combustion flame is suppressed, and the combustion performance is improved by suppressing the amount of penetrating air in the combustion cylinder. On the other hand, the arc from the ignition rod at the time of ignition is flowing into the first air chamber, but the air flow whose flow is not suppressed by the centripetal air flow continues from the side of the spray nozzle to the front of the spray nozzle. Since it is carried to the section, it can be held well without deteriorating the ignition performance. Similarly, the flame detector can still be satisfactorily cooled by an air flow that has flowed into the first air chamber but has not yet been throttled by the centripetal air flow.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is a cross-sectional configuration diagram showing an outline of a main part of a first embodiment of a spray combustor of the present invention, FIG. 2 is a view of a combustion cylinder shown in FIG. 2 is a cross-sectional configuration diagram of a main portion showing the second embodiment, FIG. 4 is a diagram showing a third embodiment of the spray combustor of the present invention, (A) is a cross-sectional configuration diagram of the main portion, and (B) is 5 is a front view of the ring body, FIG. 5 is an explanatory view showing a fourth embodiment of the spray combustor of the present invention, and FIG. 6 is a fifth view of the spray combustor of the present invention.
FIG. 3 is a cross-sectional configuration diagram of a main part showing the embodiment of FIG.

A first embodiment will be described with reference to FIG. A spray introduction port 12 for introducing spray fuel is provided at the center of the base end surface 11 of the combustion cylinder 10, a spray nozzle 20 is made to face the position before the spray introduction port 12, and a swirl vane 30 is provided around the spray introduction port 12. A flame detector 50 including an ignition rod 40 and CdS 2 is provided near the spray nozzle 20. The ignition rod 40 is arranged such that the discharge portion at the tip thereof is located in the vicinity of the side of the spray hole at the tip of the spray nozzle 20, and the first air cylinder 60 surrounds the spray nozzle 20, the ignition rod 40, and the flame detector 50. Is provided, and the inside is defined as the first air chamber A. The base end surface 11 of the combustion cylinder 10 and the first
The second shape that surrounds the space between the inclined front surface 61 of the empty cylinder 60
An empty cylinder 70 is provided, the space in the second air cylinder 70 is used as a second air chamber B, and an outer cylinder 80 is provided to surround the combustion cylinder 10, the first air cylinder 60, and the second air cylinder 70. Blower fan 90 in cylinder 80
Are connected. The above configuration is similar to that of the conventional device described above.

In the first embodiment according to the present invention, without connecting and fixing the tip peripheral edge of the inclined front surface portion 61 of the first air cylinder 60 forming the first air chamber A to the peripheral edge of the spray introduction port 12, A gap is secured between them, so that the second air chamber B is provided with a centripetal air outlet 100 for blowing air from the surroundings toward the central axis X of the combustor, that is, for ejecting air in the centripetal direction.

The air blown from the blower fan 90 into the outer cylinder 80 partially enters the first air chamber A through the air inlet 62 of the first air cylinder 60, and partly the second air cylinder 70. From the air inlet 71 into the second air chamber B, and the rest is directly introduced into the combustion cylinder 10 through the air holes 13 formed in the side peripheral wall of the combustion cylinder 10.
The air that has entered the first air chamber A cools the flame detector 50, then becomes a first air flow, and burns from around the spray nozzle 20 together with the spray fuel through the spray inlet 12 in the front. Cylinder
Introduced within 10. The air that has entered the first air chamber A is
At the time of ignition, after the arc from the ignition rod 40 is carried from the side of the spray nozzle 20 to the front part of the spray nozzle 20, it becomes a first air flow and is introduced into the combustion cylinder 10 through the spray inlet 12 in the front. It

On the other hand, a part of the air that has entered the second air chamber B is introduced as a swirling flow into the combustion cylinder 10 through the swirl vanes 30, and the rest is eccentric from the centripetal air outlet 100. It becomes an air flow and is blown from the surroundings in the central axis X direction. By this centripetal air flow, the straight component of the first air flow which is about to flow into the combustion cylinder 10 through the spray introduction port 12 is appropriately suppressed in its flow rate and momentum, and as a result, the combustion flame lift The phenomenon is suppressed, and the combustion performance is improved by suppressing the amount of penetrating air in the combustion cylinder 10.
On the other hand, the arc from the ignition rod 40 at the time of ignition is flowing into the first air chamber A, but is continuously sprayed from the side of the spray nozzle 20 by the air flow whose flow is not suppressed by the centripetal air flow. Since it is carried to the front part of the nozzle 20, the ignition performance is maintained well without deterioration. Similarly, the flame detector 50 is also satisfactorily cooled by the air flow that has flowed into the first air chamber A but has not been suppressed in flow by the centripetal air flow.

A second embodiment will be described with reference to FIG. In this embodiment, the tip peripheral edge of the inclined front surface portion 61 of the first air cylinder 60 is connected and fixed to the peripheral edge of the spray introduction port 12 as in the conventional device described above. Near the tip of 61, a plurality of centripetal air outlets 101 opening from the periphery toward the central axis X are provided. Other configurations are the same as in the case of the above-described first embodiment. By doing as in the second embodiment, a part of the air that has entered the second air chamber B flows into the combustion tube 10 through the swirl vanes 30 as a swirl flow, and the rest is the centripetal air blowing. From the mouth 101, a concentric air flow is blown from the surroundings in the direction of the axis X. Due to this centripetal air flow, the combustion tube is removed from the first air chamber A.
The straight flow component of the first air flow that is about to flow into the inside of the combustion chamber 10 is appropriately suppressed in its flow rate and momentum, and as a result, the lift phenomenon of the combustion flame is suppressed, and the amount of penetrating air in the combustion cylinder 10 is suppressed. Combustion performance is improved. On the other hand, regarding the ignition performance by the ignition rod 40 and the cooling of the flame detector 50, the air flow that has flowed into the first air chamber A, but has not yet been suppressed by the centripetal air flow, will continue to be favorable. Maintained.

A third embodiment will be described with reference to FIG. In the present embodiment, a ring body 110 is provided between the tip peripheral edge of the inclined front surface portion 61 of the first air cylinder 60 and the peripheral edge of the spray introduction port 12, and the ring body 110 faces the central axis X. A plurality of centripetal air outlets 111 are provided penetrating from the surroundings in the centripetal direction. Actually, the plurality of centripetal air outlets 111 are centripetal as a whole,
The air is blown out in a direction slightly deviated from the centripetal direction by a certain direction, whereby the air blown out from each centripetal air outlet 111 forms a swirl flow, and from the first air chamber A. The straight-ahead component of the first air flow that tends to flow into the combustion cylinder 10 is suppressed in its flow rate and momentum.
Further, by promoting the swirl flow of the first air flow, the combustion performance in the combustion cylinder 10 is improved.

A fourth embodiment will be described with reference to FIG. In this embodiment, the base end surface of the combustion cylinder 10 in which the swirl vane 30 is configured
A plurality of centripetal air outlets 10 are provided between the blades of 11 so as to penetrate obliquely from the periphery toward the central axis X.
Two are provided. As for the inclined front surface portion 61 of the first air cylinder 60, the tip peripheral edge thereof is connected and fixed to the peripheral edge of the spray introducing port 12 as in the conventional device described above. Similar to the case of the third embodiment, the plurality of centripetal air outlets 102 are configured to blow air in a direction that is a centripetal direction as a whole, but slightly deviated from the centripetal direction by a certain direction. As a result, the air blown from each centripetal air outlet 102 flows in a centripetal direction while forming a swirl flow, passes through the spray inlet 12 and immediately after entering the combustion cylinder 10. 1 The flow rate and flow force of the linear component of the air flow are suppressed. Also, by promoting the swirl flow of the first air flow, the combustion cylinder
Improves combustion performance within 10. Further, regarding the ignition performance by the ignition rod 40 and the cooling of the flame detector 50, the air flow that has flowed into the first air chamber A, but has not been suppressed by the centripetal air flow, continues to be excellent. Maintained.

A fifth embodiment will be described with reference to FIG. In this embodiment, the flame detector 50 is arranged at a position near the air inlet 62 of the first air cylinder 60 to improve the cooling efficiency by the incoming air, and at the same time, the flame of the back plate 120 of the first air cylinder 60. Remove the air vent hole at a position far from where the detector 50 is located.
I am trying to install 121. Flame detector 50 is the first air cylinder
The air in the first air chamber A is cooled by sufficient air entering from the air inlet 62 of 60, while the air in the first air chamber A is released to the outside from the air escape hole 121 located away from the flame detector 50. It is possible to suppress the flow rate and flow force of the first air flow introduced into the combustion cylinder 10 from the air chamber A through the spray introduction port 12.

[0016]

According to the present invention, there is provided the above construction.
According to the spray combustor described in (1), since the second air chamber is provided with the centripetal air blowing port that flows in the centripetal direction from the surroundings with respect to the first air flow, the centripetal air blowing port of the second air chamber is provided. The straight-ahead component of the first air flow passing around the spray nozzle and traveling forward can be appropriately suppressed in its flow rate and momentum by the concentric air flow blown from the combustion flame lift. The phenomenon can be suppressed, and the combustion performance can be improved by suppressing the amount of penetrating air in the combustion cylinder. On the other hand, the arc at the time of ignition can be continuously carried from the side of the spray nozzle to the front of the spray nozzle by the air flow of the first air chamber whose flow has not been suppressed by the centripetal air flow. Good ignition performance can be maintained without degrading performance. Similarly, the flame detector can still be satisfactorily cooled by an air flow that has flowed into the first air chamber but has not yet been throttled by the centripetal air flow.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an outline of a main part of a first embodiment of a spray combustor of the present invention.

FIG. 2 is a P arrow view of the combustion cylinder shown in FIG.

FIG. 3 is a cross-sectional configuration diagram of essential parts showing a second embodiment of the spray combustor of the present invention.

FIG. 4 is a diagram showing a third embodiment of the spray combustor of the present invention.

FIG. 5 is an explanatory view showing a fourth embodiment of the spray combustor of the present invention.

FIG. 6 is a cross-sectional configuration diagram of essential parts showing a fifth embodiment of the spray combustor of the present invention.

FIG. 7 is a cross-sectional configuration diagram showing an example of a conventional spray combustor.

[Explanation of symbols]

 10 Combustion cylinder 11 Base end face 12 Spray introduction port 20 Spray nozzle 30 Swirl vane 40 Ignition rod 50 Flame detector 60 First air cylinder 61 Inclined front part 70 Second air cylinder 80 Outer cylinder 90 Blower fan 100 Centripetal air outlet 101 Centrifugal air outlet 102 Centrifugal air outlet 111 Anticentric air outlet A First air chamber B Second air chamber X Central axis

Claims (1)

[Claims] 1. A spray inlet for introducing spray fuel is provided at the center of the base end surface of the combustion cylinder, and a swirl vane is provided around the spray inlet so that the spray nozzle faces the spray inlet of the combustion cylinder. The first air chamber is configured to surround the spray nozzle,
A flame detector is provided in the first air chamber, and a second air chamber is provided between the inclined front face portion of the first air chamber and the base end face of the combustion cylinder, and the spray fuel from the spray nozzle is supplied to the first air chamber. The first air flow from the chamber is introduced into the combustion cylinder through the front spray introduction port, and the second air flow from the second air chamber is introduced into the combustion cylinder through the swirl vanes to perform combustion. A spray combustor configured to perform the first combustor in the second air chamber.
A spray combustor characterized by being provided with a centripetal air outlet that flows in a centripetal direction from the surroundings with respect to the air flow.