JP3591021B2 - Oil burner cooling device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a cooling device for an oil burner.
[0002]
[Prior art]
FIG. 6 schematically shows a generally used oil-fired boiler, in which 1 is a furnace, 2 is a rear heat transfer section connected to the furnace 1 via a sub-side wall 3, and 4 is a furnace 1 Oil burners provided in multiple stages on the outer periphery of the oil burner, 5 is a wind box for covering the oil burner 4 and guiding combustion air to the fuel injection portion of the oil burner 4, and 6 is connected to the wind box 5 The supplied air supply duct 7 is an exhaust gas duct for discharging exhaust gas.
[0003]
In such a boiler, fuel is injected from the oil burner 4 and combustion air is introduced into the wind box 5 from the air supply duct 6 and mixed with the fuel and the combustion air to ignite in this state. The combustion gas generated by the combustion in the furnace 1 is sent from the furnace 1 to the rear heat transfer unit 2 through the inside of the sub-side wall 3 and is exhausted as exhaust gas. It is discharged from the duct 7.
[0004]
In the combustion of the boiler described above, the oil burner 4 that sprays fuel such as heavy oil in a mist state is used as described above, and the structure of the oil burner 4 and its surroundings is as shown in FIG. I have.
[0005]
That is, a burner support 9 capable of supporting the oil burner 4 via a roller 9a is provided at a position where the oil burner 4 is provided on a front plate 8 forming a wall portion of the wind box 5, and a furnace wall 10 of the furnace 1 is provided. The oil burner 4 whose tip is located at the burner throat portion 11 formed at the bottom is supported by the burner support 9 so as to be perpendicular to the front plate 8.
[0006]
A burner chip 12 having a plurality of small injection holes and formed of a hard material is attached to a front end portion of the oil burner 4 that is disposed so as to penetrate the front plate 8. An air cylinder 15 capable of pushing and pulling the oil burner 4 supported by the burner support 9 in the axial direction is connected and disposed, and a fuel supply pipe 13 having a fuel supply valve 13a and a spray medium supply valve 14a are provided. The spray medium supply pipes 14 are connected respectively.
[0007]
Further, the front plate 8 is provided with an outer cylinder 16 surrounding substantially the entire oil burner 4 on the furnace 1 side with respect to the front plate 8.
[0008]
Further, the burner throat portion 11 is formed with a secondary air inlet 18 for blowing secondary air (combustion air) a provided with a register vane 17 whose opening can be adjusted. A tertiary air inlet 19 for supplying tertiary air (auxiliary air for flame adjustment) b is provided at the rear end (position opposite to the furnace 1). In FIG. 7, reference numeral 20 denotes an ignition burner, 32 denotes a rectifying cylinder, and c denotes burner gun seal air.
[0009]
In such an oil burner 4, the fuel supply valve 13a and the spray medium supply valve 14a are opened to feed the fuel (for example, heavy oil) and the spray medium (for example, steam) into the oil burner 4, thereby mixing the heavy oil and the steam. The fuel in the form of mist is injected from the injection hole of the burner chip 12 by the pressure of the steam, and the secondary air a introduced into the wind box 5 is guided from the secondary air inlet 18 to the burner throat portion 11 to be mixed with the fuel. Then, the flame is formed by ignition by the ignition burner 20, and the tertiary air b taken in from the tertiary air inlet 19 is injected through the outer cylinder 16 from the tip end of the outer cylinder 16 to adjust the flame. Combustion is performed by this.
[0010]
Although the combustion in the furnace 1 is performed using each oil burner 4 as described above, it is necessary to partially burn or stop the oil burner 4 according to the load of the furnace 1. At this time, in the oil burner 4 in a state where the combustion is stopped, the burner chip 12 is affected by radiant heat (about 800 ° C.) due to the flame of the oil burner 4 during the combustion.
[0011]
The burner chip 12 made of the above-mentioned hardness material has a problem that when the temperature rises to about 500 ° C. or more, the hardness is greatly reduced. As the injection flow rate changes, the cutting of the spray becomes worse, and as a result, there arises a problem that the boiler performance deteriorates.
[0012]
For this reason, conventionally, the air cylinder 15 connected to the rear end of the oil burner 4 is driven, and the oil burner 4 is moved to a position where the radiant heat is not affected via the burner support base 9 (the position indicated by A in FIG. 7). And the outer cylinder 16 protects the oil burner 4 by preventing radiant heat.
[0013]
[Problems to be solved by the invention]
However, the air cylinder 15 for drawing in the oil burner 4 is a large-scale device itself. If the air cylinder 15 is provided in each oil burner 4, the structure of the oil burner 4 becomes complicated, 5 has a structure in which the oil burner 4 is supported by the burner support 9 provided on the front plate 8, since it is difficult to seal the oil burner 4 and the burner support 9, the sealing structure becomes complicated. Or a complete seal cannot be obtained.
[0014]
The present invention has been made in view of the above-described circumstances, and provides a cooling device for an oil burner that can prevent a trouble occurring in the oil burner due to radiant heat, can simplify a structure around the oil burner, and can easily perform a complete sealing structure of a wind box. It is intended to do so.
[0015]
[Means for Solving the Problems]
The present invention includes a fuel supply pipe and a spray medium supply valve which are disposed through a front plate of a wind box so that a front end portion is located at a burner throat portion of a furnace and have a fuel supply valve at a rear end portion. A tubular jacket tube surrounding the oil burner is provided at least on the outer periphery of the oil burner to which the spray medium supply pipe is connected, and a cooling air supply pipe having a cooling air supply valve is provided on the jacket tube. While connecting, a plurality of cooling air injection holes capable of injecting cooling air toward the inside of the furnace are bored at equal intervals in the circumferential direction at the tip of the jacket tube ,
The cooling air injection hole is formed to be inclined so as to intersect on an extension line in the furnace of the axis of the jacket tube,
An opening / closing device that closes a cooling air supply valve based on a combustion signal that opens the fuel supply valve and the spray medium supply valve, and opens a cooling air supply valve based on a stop signal that closes the fuel supply valve and the spray medium supply valve. And a cooling device for an oil burner, wherein cooling oil is automatically injected.
[0018]
[Action]
In the present invention, when the combustion of the oil burner is stopped, the cooling air supply valve is opened to send the cooling air into the jacket tube, and the cooling air is injected into the furnace from the cooling air injection hole of the jacket tube.
[0019]
At this time, an air curtain is formed by the injected cooling air, and this air curtain cuts off radiant heat from inside the furnace hitting the tip of the oil burner, and the injected cooling air cools the tip of the oil burner. The tip is no longer affected by the radiant heat and the oil burner is cooled.
[0020]
Further, in the present invention, since the cooling air injection holes are formed so as to be inclined so as to intersect with the extension of the axis of the jacket tube in the furnace, the air curtain formed at the time of cooling air injection is formed at the tip of the oil burner. Is completely covered, so that the radiant heat can be completely shut off, so that the oil burner can be more reliably cooled.
[0021]
Further, in the present invention, when the combustion of the oil burner is stopped, the cooling air supply valve is opened and the operation of closing the cooling air supply valve when the oil burner is burned is automatically performed, so that the cooling operation of the oil burner is automatically performed. Can do it.
[0022]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
1 to 5 show one embodiment of a cooling device for an oil burner according to the present invention. The same components as those shown in FIG.
[0024]
In the present embodiment, as shown in FIG. 1, the oil burner 4 penetrates the front plate 8 of the wind box 5 and surrounds the outer periphery of the oil burner 4 provided to be perpendicular to the front plate 8. A double tube jacket tube 21 having substantially the same length as that described above is attached to the front plate 8 via a gasket 22.
[0025]
A burner chip 12 having a plurality of small injection holes is attached to the tip of the oil burner 4, and a fuel supply valve 13 a is provided at the rear end of the oil burner 4 via a coupling 23. The supply pipe 13 and the spray medium supply pipe 14 provided with the spray medium supply valve 14a are respectively connected.
[0026]
At the tip of the jacket tube 21, cooling air injection holes 25 whose axes are inclined so as to intersect with the extension of the jacket tube axis 24 in the furnace 1 as shown in FIGS. A cooling air supply pipe 26 having a cooling air supply valve 26a is connected to the rear end of the jacket tube 21. In addition, the cooling air injection holes 25 can be formed as double holes as shown in FIGS.
[0027]
Further, a combustion signal 28 for opening the fuel supply valve 13a and the spray medium supply valve 14a for burning the oil burner 4 is sent, and the fuel supply valve 13a and the spray medium supply valve 14a are closed for stopping the oil burner 4. A control device 27 capable of sending a stop signal 29 is provided. The control device 27 detects a combustion signal 28 from the control device 27, closes the cooling air supply valve 26a based on the combustion signal 28, and outputs a stop signal from the control device 27. An opening / closing device 30 for detecting the stop signal 29 and opening the cooling air supply valve 26a based on the stop signal 29 is provided. In FIG. 1, reference numeral 18 denotes a secondary air inlet for blowing secondary air (combustion air) a provided with a register vane 17, and 19 denotes a tertiary air (supply air for flame adjustment) b. The air inlet 20 is an ignition burner.
[0028]
Next, the operation of the present embodiment will be described.
[0029]
In this embodiment, to burn the oil burner 4, the fuel supply valve 13a and the spray medium supply valve 14a are opened to feed the fuel (for example, heavy oil) and the spray medium (for example, steam) into the oil burner 4, and the burner chip A mist of fuel is injected from the 12 injection holes, the secondary air a is guided from the secondary air inlet 18 to the burner throat portion 11 and mixed with the fuel, and ignited by the ignition burner 20 to form a flame. At the same time, the tertiary air b taken in from the tertiary air inlet 19 is injected from the front end side of the outer cylinder 16, and the flame is adjusted to burn the oil burner 4.
[0030]
In this combustion state, the burner chip 12 of the oil burner 4 is cooled by the injected fuel and the spray medium.
[0031]
When the combustion of the oil burner 4 is stopped, the fuel supply valve 13a and the spray medium supply valve 14a are closed, and simultaneously, the cooling air supply valve 26a is opened to send cooling air into the jacket tube 21, and Cooling air is injected from the cooling air injection hole 25 of the tube 21 into the furnace 1.
[0032]
At this time, an air curtain 31 as shown in FIGS. 2 and 4 that completely covers the tip of the oil burner 4 is formed by the cooling air, and this air curtain 31 is provided in the furnace 1 that can hit the tip of the oil burner 4. Of the oil burner 4 is cooled by the injected cooling air, so that the burner chip 12 of the oil burner 4 is not affected by the radiant heat from inside the furnace 1 and the oil burner 4 4 is reliably performed, and the occurrence of trouble due to burnout of the burner chip 12 is prevented.
[0033]
Further, since the cooling of the oil burner 4 can be performed without using the air cylinder 15 which is a large-scale device as in the related art, the structure of the oil burner 4 peripheral piece can be simplified, and the oil burner 4 can be cooled. It is not necessary to use the burner support 9 for moving the oil burner, so that a complete sealing structure between the oil burner 4 and the front plate 8 can be easily performed. Can be done in a short time.
[0034]
Further, the cooling air supply valve 26a is opened when the combustion of the oil burner 4 is stopped, and the operation of closing the cooling air supply valve 26a when the oil burner 4 is burned can be automatically performed. Air injection can be performed automatically and reliably.
[0035]
In the embodiment of the present invention, the length of the jacket tube 21 surrounding the oil burner 4 is substantially the same as the length of the oil burner 4, but at least the length surrounding the tip of the oil burner 4. In this case, the outer tube 16 shown in the conventional example may be provided in a portion where the jacket tube 21 is not provided, and various other methods may be used without departing from the gist of the present invention. Of course, changes can be made.
[0036]
【The invention's effect】
According to the present invention, it is possible to prevent the occurrence of trouble due to burnout of the burner chip, to simplify the structure around the oil burner, and to easily perform a complete sealing structure between the oil burner and the front plate. it is possible can be done distribution設作industry of the oil burner in a short period of time, also, the injection of the cooling air because the air curtain is formed so as to completely cover the distal end portion of the oil burner, the oil burner Radiant heat impinging on the tip can be completely shut off, so that cooling of the oil burner can be reliably performed. Further, when stopping combustion of the oil burner, a cooling air supply valve is opened to burn the oil burner. At this time, the operation of closing the cooling air supply valve is performed by the opening / closing device, so that the cooling air can be injected more reliably and automatically.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view showing one embodiment of a cooling device for an oil burner of the present invention.
FIG. 2 is a longitudinal sectional side view showing an example of a cooling air injection hole formed in the jacket tube of FIG.
FIG. 3 is a view in the direction of arrows III-III in FIG. 2;
FIG. 4 is a vertical sectional side view showing another example of a cooling air injection hole formed in the jacket tube of FIG. 1;
FIG. 5 is a view in the direction of arrows VV in FIG. 4;
FIG. 6 is a schematic view of a commonly used oil-fired boiler.
FIG. 7 is a vertical sectional side view showing an example of a conventional oil burner and its peripheral structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace 4 Oil burner 5 Wind box 8 Front plate 11 Burner throat part 13 Fuel supply pipe 13a Fuel supply valve 14 Spray medium supply pipe 14a Spray medium supply valve 21 Jacket tube 24 Jacket tube shaft center 25 Cooling air injection hole 26 Cooling air supply Pipe 26a cooling air supply valve 28 combustion signal 29 stop signal 30 switchgear

Claims (1)

A fuel supply pipe provided with a fuel supply valve at a rear end thereof and a spray medium supply pipe provided with a spray medium supply valve at a rear end thereof, the fuel supply pipe being provided through a front plate of a wind box so that a front end is located at a burner throat part of a furnace. A tubular jacket tube surrounding the oil burner is provided at least on the outer periphery of the oil burner to which the oil burner is connected, and a cooling air supply pipe having a cooling air supply valve is connected to the jacket tube. At the tip of the jacket tube, a plurality of cooling air injection holes capable of injecting cooling air toward the furnace are bored at equal intervals in the circumferential direction ,
The cooling air injection hole is formed to be inclined so as to intersect on an extension line in the furnace of the axis of the jacket tube,
An opening / closing device that closes a cooling air supply valve based on a combustion signal that opens the fuel supply valve and the spray medium supply valve, and opens a cooling air supply valve based on a stop signal that closes the fuel supply valve and the spray medium supply valve. A cooling device for an oil burner, wherein the cooling device is configured to automatically inject cooling air .

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