JPH0590113U - Gun type burner - Google Patents

Abstract

(57) [Summary] [Purpose] In a gun-type burner for flame generation, the mechanism for shortening the flame by adjusting the flame is simplified. [Structure] In the gun type burner of the present invention, the fan 15 portion is provided at a position perpendicular to the longitudinal centerline of the inner cylinder 13, and the end portions of the inner cylinder 13 and the outer cylinder 14 on the opposite side of the fan. Has a straight cutout shape, and the inner cylinder 13 and the flame stabilizer 16 are configured separately.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a gun-type burner, and more specifically, a gun-type burner used as a heat source for a boiler or a hot-air heater has a double cylinder structure surrounding a nozzle portion, and a fuel nozzle and the like are arranged in an inner cylinder to provide a blower. Air flows from the blowing port provided at the longitudinal centerline of the outer cylinder while swirling between the inner cylinder and the outer cylinder, and flows out mainly as combustion air from the flame stabilizer blades and the outer circumference. The present invention relates to an improvement of a gun type burner capable of shortening the flame by mixing and burning with fuel.

[0002]

[Prior Art]

 FIG. 5 is a view of a conventional gun type burner, where FIG. 5A is a vertical sectional side view, FIG. 5B is a sectional view taken along line VI-VI of FIG. 6A, and FIG. FIG. 7 is a diagram showing the tip structure of the gun-type burner of FIG. 7, and FIG. As shown in FIG. 5 (A), the conventional gun-type burner has a nozzle 31, a nozzle adapter 32, a nozzle pipe 33, and an ignition rod 34 placed in a blast tube 35, and sends out air necessary for combustion to a rear end portion thereof. The fan 36 is connected in the connecting direction of the blast tube 35. The fan 36 blows air into the blast tube 35 in a single direction and swirls it with a flame holder (hereinafter also referred to as a diffuser) 37 to create an angled air flow (arrow in the figure), and the spray of the nozzle 31. It is mixed with fuel and burned. As shown in FIG. 6, the diffuser 37 is installed in the blast tube 35, and the fuel from the nozzle 31 is blown out from the center hole 38 formed in the center. The diffuser 37 itself is composed of a plurality of vanes, and has a function of causing the air sent from the fan 36 to impinge on the roots to swirl and create an angled air flow from between the vanes. As for the combustion process, referring to FIG. 5 (A), the air sent from the fan 36 flows in the cylindrical blast tube 35, and the air flow at an angle due to the swirling force of the vanes of the diffuser 37 and the diffuser 37. The central hole 38 and the air flow passing through the outer periphery 39 mix with the atomized fuel of the nozzle 31, and the ignition rod 34 starts combustion. FIG. 7 shows a state in which a conventional gun-type burner is burned in an actual hot air heater furnace, and the shape of the flame 44 extends long in the blowing direction.

[0003]

[Problems to be solved by the device]

In the conventional gun-type burner, the shape of the flame 44 is long in the blowing direction as shown in Fig. 7. Therefore, in a combustion furnace that exchanges heat with air, when the furnace body 40 is made compact, the rear furnace wall 41 of the furnace body 40 is used. There is a problem that the burning of the furnace leads to damage to the furnace body 40. Further, even if the rear furnace wall 41 is not damaged by burning, a large number of smoke tubes 23b through which a large amount of hot air passes are arranged in the heat exchanger 42a portion of the rear furnace wall 41 as shown in FIG. 4, for example. Therefore, if it is heated to about 500 ° C or more, thermal fatigue (the furnace material expands and contracts because the heating and cooling are repeated in the furnace) rapidly progresses, and the service life of the furnace decreases. The heat exchanger 23a (smoke pipe 23b) in FIG. 3 corresponds to the heat exchanger 42a (smoke pipe 42b) in FIG. Specifically, as shown in FIG. 7, the furnace body 40 in the vicinity of the flame 44 is directly heat-exchanged by the blower 46a, whereas the rear furnace wall 41 is less likely to be directly hit by the wind of the blower 46b. Is not performed sufficiently and the temperature tends to be high, so thermal fatigue is a particular problem. Therefore, it is necessary to reduce the temperature by shortening the flame and moving the flame away from the rear furnace wall 41. Further, if the burner flame is long in the blowing direction, it is difficult to reduce the size of the furnace itself for the above reasons, and it is difficult to reduce the cost, and the installation of the furnace requires a large area. Therefore, conventionally, as a means for reducing the flame of a gun-type burner, the air resistance of the diffuser 37 is increased to increase the turning force. Specifically, there are means such as reducing the angle of the blade portion of the diffuser 37 and increasing the area of the blade portion of the diffuser 37 in the blast tube 35 (see FIGS. 5 and 6). However, in this case, the air resistance increases as the angle of the vanes decreases, and the wind speed on the diffuser surface increases in proportion to this, causing a lifting phenomenon in which the flame is blown out by the wind. In addition, in order to increase the area of the diffuser 37, the diameter of the center hole 38 may be made as small as possible, but the shape of the nozzle 31 and the arrangement of the ignition rod 34 make it convenient for the center hole. When the area becomes larger and the resistance becomes larger, the resistance at the center hole becomes smaller at this time, so there is a problem that combustion is impossible due to the air flow flowing to the center hole. As described above, in the conventional gun type burner, it is difficult to shorten the flame only by adjusting the diffuser vanes and the like, and the nozzle 31, the nozzle adapter 32, and the ignition rod 34 in the blast tube 35 are exposed. There is a problem that the shape of the flame becomes uneven and unstable due to the turbulence of the air flow, which adversely affects combustion.

Therefore, the present invention was created in view of the above-mentioned conventional problems, and it is possible to shorten the flame of the burner and to adjust the length of the flame in shortening the flame, and It is an object to provide a gun type burner that can obtain a flame with a stable shape.

[0005]

[Means for Solving the Problems]

 The gun-type burner of the present invention includes a fuel blowout nozzle of the burner, an inner cylinder surrounding the nozzle adapter and the ignition rod, an outer cylinder enclosing the inner cylinder and a size larger than that, and a fan between the outer cylinder and the inner cylinder. In the gun type burner that blows in air and swirls it with the flame stabilizer blades to create an angled air flow, mixes and burns the emitted air and fuel, the fan part similar to the pistol's grip The inner cylinder and the outer cylinder are arranged in a vertical direction toward the longitudinal centerline, and the opposite ends of the inner cylinder and outer cylinder fan parts are cut out substantially perpendicular to the longitudinal centerlines of the inner cylinder and the outer cylinder. It is characterized in that the tip of the inner cylinder is installed near the center hole of the flame stabilizer.

[0006]

[Action]

 In the present invention, since the air from the fan 15 part similar to the grip of a pistol is blown toward the inner cylinder 13 almost vertically, the air flows only between the outer cylinder 14 and the inner cylinder 13, and the flame holding is performed. There is almost no outflow of air from the center hole 17 of the flame holder 16, the flame of the burner is not blown out by the air flow, and most of the air flow hits the blades of the flame stabilizer 16 directly and produces a strong swirling flow. Can be obtained, the flame can be shortened by the angled air flow, and the ends of the inner cylinder 13 and the outer cylinder 14 opposite to the fan part are cut straight so that the air flow is disturbed. The flame stabilizer 16 is adjusted only by the flame stabilizer 16, and further, since the flame stabilizer 16 is configured separately from the inner cylinder 13, it can be easily manufactured and assembled.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a gun type burner according to an embodiment of the present invention. FIG. 1A is a side vertical sectional view, and FIG. 1B is a sectional view taken along the line I--I of FIG. 1A. 2 is a diagram showing the tip structure of the gun-type burner of FIG. 1, FIG. 3 is a diagram of the burner according to the embodiment of the present invention during combustion, and FIG. 4 is a view of the rear furnace wall of FIG. 3 seen from the burner combustion direction. It is a figure.

The gun-type burner according to the embodiment of the present invention is implemented by using a gun-type oil burner that uses oil as a fuel. As shown in FIGS. 1 and 2, a nozzle 11 having an oil outlet at its tip, a nozzle adapter 18, a nozzle pipe 19 for supplying oil to the nozzle adapter, and an ignition rod 12 for igniting fuel by discharge of electrodes are cylindrical. It is surrounded by a cylindrical inner tube 13. The tip of the inner cylinder 13 extends to and surrounds the tip of the nozzle 11. The outer side of the inner cylinder 13 is surrounded by a cylindrical outer cylinder (blast tube) 14 that is one size larger. As shown in Fig. 1 (B), when viewed from the front of the burner (in the direction of the hole in the blast tube), the inner cylinder 13 and the outer cylinder 14 are located almost concentrically, and the space between both tubes is The air sent from the fan 15 is made to flow smoothly. This space is large enough to supply the amount of air required for burning the burner. Further, the front ends of the inner cylinder and the outer cylinder are notched in the vertical direction as seen in FIG. 1 (A). In the space between the outer cylinder 14 and the inner cylinder 13, the air blown from the fan 15 flows in the blowing direction (rightward in FIG. 1 (A)) and is swirled by the blades of the flame stabilizer (diffuser) 16 to form an angle. Creates a flow of air (see the arrow in Fig. 1 (A)). The flame stabilizer 16 is formed of a donut-shaped plate having a central hole 17 as shown in FIG. 2, and a blade portion is formed in the plate portion by radially erecting from the center. In the embodiment of the present invention, when changing the angle of the blade and the degree of pulling up and changing the air blowing angle, use a flame stabilizer having a blade with a different angle and pulling up and raising, and replace it accordingly. However, it is also possible to use a flame stabilizer with variable blade angles. The flame stabilizer is fixed inside the outer cylinder 14, and the cylinder tip of the inner cylinder 13 is installed so as to be close to the center hole 17 of the flame stabilizer 16 (see FIG. 2). The angled air flow created by this flame stabilizer blows out near the nozzle 11 and mixes with the oil in the nozzle 11 to create conditions suitable for combustion. This mixed gas of air and oil is ignited by the spark of a spark rod using an electrode, and the combustion of the burner starts.

The length (L ₁ ) of the flame 24 of the gun-type burner 25 that burns in the furnace body 22 of the actual hot air heater as shown in FIG. 3 by using the gun-type burner described above is as follows. Compared to the length (L ₂ ) of the flame 44 of the conventional gun-type burner 45 shown in Fig. 7, the flame itself is made more uniform and a stable flame is obtained, and the flame adjustment Has become easier. The reason is that, as shown in Fig. 6, in the conventional gun-type burner without an inner cylinder, the air sent from the fan was also blown out from the center hole 38 of the diffuser 37, so that the air in the diffuser 37 The resistance was reduced by that amount, and the turning force of the diffuser 37 was insufficient, but by inserting the inner cylinder, the outflow of air from the center hole was stopped, and the air from the fan mainly hits the blades of the diffuser, Since the wind pressure becomes the swirling force as it is, the swirling force by the diffuser is increased, which makes it possible to supply the angled air vigorously. In addition, the inner tube isolates the nozzle and ignition rod from the air flow, eliminating the turbulence of air that was previously present and stabilizing the flame shape. Also, most of the air flow used for combustion comes out through the flame stabilizer, and the blowing angle of the air flow can be adjusted only by adjusting the angle of the flame stabilizer blade and adjusting the pulling and raising condition. it can. In other words, adjustment of the flame length according to the furnace can now be done only by replacing the diffuser. Combustion tests were conducted using the embodiments of the present invention, and the results shown in the following table were obtained by comparison with the conventional type gun burner under the same conditions.

[0010]

[Table 1] From this table, it can be seen that the flame length, which was 900 mm in the conventional burner, was shortened to 450 mm in the embodiment of the present invention, which is about half. Since the flame could be moved away from the rear furnace wall by this shortening of the flame, the temperature of the rear furnace wall in the past was an average of 410 ° C, but in the embodiment of the present invention, it decreased to 320 ° C, and a temperature difference of 90 ° C was generated. It was Regarding the combustion conditions in the above combustion test, a combustion chamber of the same size (φ 600 × 1000 l) was used, and the amount of oil and the amount of combustion air were almost the same. The shape of the flame was visually observed to compare the conventional example with the example of the present invention. As a result, the flame of the conventional gun type burner was elongated in the blowing direction (see FIG. 7), and the uniformity and stability of the flame were not good. However, in the gun-type burner according to the embodiment of the present invention, the flame emitted from the nozzle spreads radially, the length in the blowing direction was short (see FIG. 3), and the flame shape was uniform and stable.

[0011]

[Effect of the device]

 As described above, the gun-type burner of the present invention can shorten the flame of the burner, and can easily adjust the length of the flame that shortens the flame so that a flame with a stable shape can always be obtained. There is. For this reason, the furnace can be made compact and the cost can be reduced, and since the installation area of the furnace is small, it is possible to effectively use the space.

[Brief description of drawings]

FIG. 1 is a diagram of a gun-type burner according to an embodiment of the present invention.
(A) is a side vertical cross-sectional view, and (B) is a cross-sectional view taken along the line I-I of (A).

2 is a tip structure diagram of the gun type burner of FIG. 1. FIG.

FIG. 3 is a diagram during burner combustion according to an embodiment of the present invention.

4 is a view of the rear furnace wall as seen from the burner combustion direction of FIG.

FIG. 5 is a sectional view of a conventional gun-type burner, which is shown in FIG.
Is a side vertical cross-sectional view, and FIG. 6B is a cross-sectional view taken along line VI-VI of FIG.

FIG. 6 is a tip structure diagram of a conventional gun-type burner.

FIG. 7 is a view of a conventional burner during combustion in a furnace.

[Explanation of symbols]

 11 Nozzle 12 Ignition rod 13 Inner tube (inner tube) 14 Outer tube (blast tube) 15 Fan 15a Air inlet 16 Flame stabilizer (diffuser) 17 Center hole 18 Nozzle adapter 19 Nozzle pipe 20 Inner tube cover 21 Rear furnace wall 22 Furnace body 23a Heat exchanger 23b Flue tube 24 Flame 25 Gun type burner 26a, 26b Blower 27 Chimney connection port

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[Procedure amendment]

[Submission date] November 12, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 3]

[Figure 1]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

Claims (1)

[Scope of utility model registration request] 1. A burner fuel outlet nozzle (11), an inner cylinder (13) surrounding a nozzle adapter (18) and an ignition rod (12), and an outer cylinder enclosing the inner cylinder (13) and one size larger than that. 14), and blow air from the fan (15) between the outer cylinder (14) and the inner cylinder (13) and swirl it with the blades of the flame stabilizer (16) to create an angled air flow, In a gun-type burner that mixes and burns the emitted air and fuel, the fan (15) part similar to the grip of the pistol is arranged almost vertically toward the longitudinal centerline of the inner cylinder (13), The opposite ends of the inner cylinder (13) and the outer cylinder (14) from the fan part are cut out substantially perpendicular to the longitudinal centerlines of the inner cylinder and the outer cylinder, and the tip of the inner cylinder (13) retains flame. Gun type burner characterized by being installed in a position close to the central hole (17) of the vessel (16).