JP3603411B2 - Spray combustor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spray combustor that sprays fuel into a combustion cylinder and introduces air for combustion into the combustion cylinder to perform combustion.
[0002]
[Prior art]
Conventionally, a petroleum fuel sprayed from a spray nozzle such as a gun-type burner is introduced into a combustion cylinder through a spray introduction port provided at a central portion of a base end surface of the combustion cylinder, and is provided in a spray combustor for combustion. In order to ensure good combustion, the combustion air supplied from the blowing means is divided into several groups and supplied into the combustion cylinder from different locations. One group is a primary air flow that is introduced into the combustion cylinder through the spray inlet together with the spray fuel from the surroundings along the spray nozzle, and another group is the primary air stream that is the spray inlet. Is swirling airflow swirled into the combustion cylinder via swirling vanes provided around the swirling blade.
Since the primary air flow is introduced straight from the periphery of the spray nozzle into the combustion cylinder via the spray inlet, if the amount of the primary air flow is too large, the stability of the flame (flame retardant ) Gets worse. For this reason, conventionally, an air cylinder is provided around the spray nozzle, and only a limited part of the air sent from the blowing means is introduced into the air cylinder, and the primary air introduced into the combustion cylinder together with the spray fuel is introduced. In order to improve the balance between the air and the primary air taken into the air cylinder, a large number of primary air intake ports, which are made up of dispersed and small holes, are provided dispersedly on the peripheral wall of the air cylinder, and are rectified. Was.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional spray combustor, since the primary air intake port composed of small holes is provided in a large number on the peripheral wall of the air cylinder, it is directly provided to the flame detector arranged in the air cylinder. There was a problem that the amount of air hit was small and the flame detector was likely to be insufficiently cooled.
[0004]
Therefore, the present invention solves the above-described drawbacks of the conventional spray combustor, and appropriately reduces the amount of primary air introduced into the combustion cylinder together with the spray fuel, while reducing the cooling effect of the primary air on the flame detector. It is an object of the present invention to provide a spray combustor which raises the primary air balance and does not significantly impair the balance of the primary air.
[0005]
[Means for Solving the Problems]
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 face of the combustion cylinder and a swirling blade provided around the spray inlet, and the spray combustor before the spray inlet is provided. A spray nozzle is provided at a position facing the combustion cylinder, a first air cylinder is provided so as to surround the spray nozzle, a flame detector is provided in the first air cylinder, and one of the air sent from the blowing means is provided. Part is introduced into the first air cylinder, is introduced as primary air into the combustion cylinder together with the fuel sprayed from the spray nozzle, and is subjected to combustion, and other air is sent from the blowing means. A spray combustor in which a part is swirled into the combustion cylinder through the swirl vane, wherein a first air intake for taking air into the first air cylinder is provided in the first air cylinder. 2 at the position of the flame detector and at the position just opposite It is characterized in that provided Tokoro opening.
[0006]
According to the above-mentioned feature of the present invention, a limited amount of air sent from the blower is introduced into the first air cylinder from the first air intake of the first cylinder, and is sprayed as primary air. The fuel and the fuel are introduced into the combustion cylinder from the spray inlet.
The air that has entered the first air cylinder from one of the first air intakes hits the flame detector with a mass of air and cools it. Then, the remaining air entering through the first air intake at a position opposite by 180 degrees balances the air entering through the one first air intake. As a result, the primary air in the first air cylinder is brought into an appropriately balanced and uniform state as a whole. Further, since the amount of primary air introduced into the combustion cylinder together with the spray fuel from the first air cylinder is suppressed, the stability of the flame is also ensured.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a sectional view schematically showing a spray combustor according to an embodiment of the present invention, and FIG. 2 is a relationship between a first air intake and a flame detector when the first air cylinder in FIG. FIG.
[0008]
A spray inlet 12 for introducing the spray fuel is provided at the center of the base end face 11 of the combustion tube 10, and a spray nozzle 20 is disposed on the central axis X of the combustor at a position before the spray inlet 12. It faces the inlet 12. A swirling blade 30 is provided around the spray inlet 12. Reference numeral 13 denotes an air hole provided on the side peripheral wall of the combustion tube 10.
An ignition rod 40 and a flame detector 50 made of CdS or the like are provided near the spray nozzle 20. A first air cylinder 60 is provided so as to surround the spray nozzle 20, the ignition rod 40, and the flame detector 50, and the inside of the first air cylinder 60 is a first air chamber A. The peripheral edge of the front end of the inclined front portion 61 of the first air cylinder 60 is connected and fixed to the peripheral edge of the spray inlet 12.
The second air cylinder 70 is provided so as to surround a space between the base end face 11 of the combustion cylinder 10 and the inclined front surface 61 of the first air cylinder 60, and the space in the second air cylinder 70 is the second air cylinder. An air chamber B is provided. Further, an outer cylinder 80 is provided so as to surround the combustion cylinder 10, the first air cylinder 60, and the second air cylinder 70. The outer cylinder 80 is connected to a blower fan 90 as a blower. One rectifying cylinder may be provided concentrically inside the outer cylinder 80.
The air sent from the blower fan 90 is introduced into the outer cylinder 80, and a part of the air introduced into the outer cylinder 80 from the first air intake ports 62 and 63 of the first air cylinder 60. The air enters the first air cylinder 60 and becomes primary air. Further, the remaining part enters the second air chamber B from the air inlet 71 of the second air cylinder 70, and the rest is introduced directly into the combustion cylinder 10 through the air hole 13 provided on the side peripheral wall of the combustion cylinder 10.
[0009]
The flame detector 50 uses CdS or the like as a sensor as described above, and is disposed in the first air cylinder 60 in order to avoid a high temperature, and detects the flame in the combustion cylinder 10 through the spray inlet 12. Although it is a member for detecting the presence or absence, in this example, it is arranged in parallel with the side of the spray nozzle 20. The first air intake ports 62 and 63 provided in the first air cylinder 60 are provided at only two places in total, and one of the first air intake ports 62 is opened at a position where the flame detector 50 is located. The other first air intake port 63 is provided at a position just opposite to the one first air intake port 62, that is, at a position rotated by 180 degrees. The sizes of the openings of the two first air intake ports 62 are the same or almost the same.
[0010]
A limited part of the air blown into the outer cylinder 80 from the blower fan 90 enters the first air chamber A from the first air intake ports 62 and 63 of the first air cylinder 60 and becomes primary air. The fuel is introduced into the combustion cylinder 10 from the periphery of the spray nozzle 20 through the front spray inlet 12 together with the spray fuel, and is subjected to combustion. Further, the remaining part enters the second air chamber B from the air inlet 71 of the second air cylinder 70, and is swirled and introduced into the combustion cylinder 10 via the swirling blade 30. The remainder is introduced directly into the combustion cylinder 10 from the air hole 13 provided in the side peripheral wall of the combustion cylinder 10 in a centrifugal direction.
[0011]
Of the air introduced into the first air cylinder 60 from the first air intake ports 62 and 63, the flame detector 50 passes through the first air intake port 62 opened at a certain position to the first air cylinder 60. The inflowing air hits the flame detector 50 with an appropriate amount of air and cools it. The remaining air entering through the first air intake 63 at a position opposite by 180 degrees is balanced with the air flowing into the first air cylinder 60 from the one first air intake 62, and Of the primary air as a whole is in a balanced and uniform state.
Of course, since the total amount of air introduced into the first air cylinder 60 is suppressed by the first air intake ports 62 and 63, the air introduced from the first air cylinder 60 into the combustion cylinder 10 is reduced. As a result of suppressing the amount and the momentum of the secondary air, blow-out of the flame and the like are prevented, and the stability of the flame is secured.
[0012]
【The invention's effect】
According to the spray combustor according to the first aspect of the present invention, the first air intake for introducing air into the first cylinder has a flame detector of the first cylinder. The opening is provided at two positions, one at the position and the position just opposite to the other, so that the flame detector can be effectively operated by the collective air introduced into the first air cylinder from one of the first air intakes. Can be cooled. Further, the primary air in the first air cylinder can be balanced and uniform by the air introduced into the first air cylinder from the remaining first air intake port at the opposite position. The amount and momentum of the primary air introduced into the cylinder can be made uniform around the fuel spray, and the flame can be stabilized. In addition, of course, since the first air intake is provided only at two locations and the total amount of air introduced into the first cylinder is suppressed, the amount and momentum of primary air introduced into the combustion cylinder can be suppressed. It is possible to prevent the blowout of the flame and the like, and to secure the stability of the flame.
[Brief description of the drawings]
FIG. 1 is a sectional view schematically showing a spray combustor according to an embodiment of the present invention.
FIG. 2 is a sectional configuration diagram showing a relationship between a first air intake and a flame detector when the first air cylinder in FIG.
[Explanation of symbols]
Reference Signs List 10 Combustion cylinder 11 Base end face 12 Spray inlet 20 Spray nozzle 30 Swirler 50 Flame detector 60 First air cylinder 62, 63 First air intake 90 Blower fan

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 therearound. A spray nozzle is provided in front of the spray inlet so as to face the combustion cylinder, and A first air cylinder is provided so as to surround the nozzle, a flame detector is provided in the first air cylinder, and a part of the air sent from the blowing means is introduced into the first air cylinder, and a primary air cylinder is provided. As a result, the fuel is introduced into the combustion cylinder together with the fuel sprayed from the spray nozzle for combustion, and another part of the air sent from the blowing means is swirled into the combustion cylinder via the swirling blade. A spray combustor, wherein a first air intake for introducing air into the first cylinder is located at a position exactly opposite to a position of the flame detector of the first cylinder. A spray combustor characterized in that it is provided with two openings.

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