JP2001116221A - Oil burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner enabling stable ignition, capable performing stable combustion, avoiding the malfunction of an inserting and extracting device, and further, capable of maintenancing stable combustion flame. SOLUTION: This is an oil burner which possesses a primary air nozzle 22 which is arranged within a burner wind box 21 and supplies primary air from outside into the boiler burner, a primary air flow rate adjusting means 28 which adjusts the quantity of primary air supplied to the primary air nozzle, a secondary air nozzle 23 which is provided on the same axis as that nozzle besides being outside the primary air nozzle, a burner gun 25 which injects fuel oil, with its tip inserted into the boiler furnace on the center axis of the primary air nozzle, an inserting and extracting device 26 which holds the burner gun and insets, extracts and moves the same on the center axis of the primary air nozzle, and a flame holder 27 which is attached to the primary air nozzle and inserts the tip of the burner gun into the boiler furnace and stabilizes the flame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-fired burner used for power generation, industrial boilers, furnaces for the chemical industry, etc., and using high-temperature combustion exhaust gas from a gas turbine, a diesel engine or the like as combustion air.

[0002]

2. Description of the Related Art Conventionally, as this kind of oil-fired burner,
The one shown in FIGS. 4 and 5 is known. Here, FIG.
Is a side view showing a part of the center part of the oil-fired burner in a cross section, and FIG. 5 is a cross-sectional view taken along line XX in the figure.

[0003] The main part of the burner is a burner-like box 1;
Oil compartment 2 and air conditioning compartment 3
And an oil air nozzle 4, an air swirler 5, a flame stabilizer 6, a burner gun 7, a guide pipe 8, and an automatic pipe for removing the guide pipe 8 arranged on the central axis of the burner wind box 1. It comprises an insertion / removal device 9, an auxiliary air nozzle 10 of the air conditioner compartment 3, and an atomizer 11.

[0004] The burner-like box 1 comprises an oil compartment 2 disposed in the burner-like box 1 and air conditioner compartments 3 above and below the oil compartment 2. The oil air nozzle 4 is provided on the central axis of the burner-like box 1 and at the outlet of the oil compartment 2. The air swirler 5 is arranged in the oil air nozzle 4. The flame stabilizer 6 is provided at the center of the oil air nozzle 4.

The burner gun 7 is inserted and inserted into a guide pipe 8 at the center of the flame stabilizer 6. The guide pipe 8 guides the burner gun 7 and is mounted at the center of the flame stabilizer 6 so as to penetrate the flame stabilizer 6. The atomizer 11 is inserted into the tip of the burner gun 7. Reference numeral 12 in the drawing indicates a ring frame formed on the back surface of the flame stabilizer 6.

In the burner having such a configuration, the combustion exhaust gas generated by a gas turbine (hereinafter abbreviated as G / T) or a diesel engine (hereinafter abbreviated as D / E) or the like is shown in FIG. Combustion air 13a
Is sent into the burner-like box 1. Further, the fuel oil 13 and the spray medium (compressible fluid such as water vapor and compressed air) 14 sent from the oil supply equipment and the spray medium air supply equipment (not shown) are mixed, and the automatic removal device 9 and the burner gun 7 are mixed. The fuel oil 13 is atomized by being injected from the atomizer 11 into the boiler furnace 15 via the.

The combustion air 12 sent into the oil compartment 2 is blown into the boiler furnace 15 as primary oil 16 through the flame stabilizer 6.
Oil secondary air 17 is blown into the boiler furnace 15 from the air swirler 5 of the oil air nozzle 4. On the other hand, the combustion air 13 a sent into the air conditioner compartment 3 is blown into the boiler furnace 15 from the auxiliary air nozzle 10 as auxiliary air 18.

The fuel oil 13 injected into the boiler furnace 15 and atomized is ignited by an ignition torch flame (not shown) to form a flame 19. The flame 19 is stabilized by the particles of the atomized fuel oil 13 being entrained in the vortex generated on the back of the flame stabilizer 6 by the oil primary air 16 blown through the flame stabilizer 6 and igniting to form the ring frame 12. Become The oil secondary air 17 is consumed from the vicinity of the ignition point of the formed flame 19 in the combustion in the main combustion zone.

The ring frame 12 formed on the back of the flame stabilizer 6 serves as an ignition source for the flame 19. When the stable ring frame 12 is formed, a part of the particles of the fuel oil 13 is ignited by the ring frame 12 and is always sent to the main combustion zone of the flame 19, so that the stable flame 19 is formed. become.

As described above, the ring frame 12 has the flame 1
9 is indispensable for the stability of the fuel oil 9, the fuel oil 13
Particles burn incompletely, and eventually become carbonized and adhere to and accumulate on the back surface of the flame stabilizer 6. The adhesion and deposition of carbon on the back of the flame stabilizer 6 increases as the metal temperature of the flame stabilizer 6 increases.

When the flame 19 is extinguished, the fuel oil 13 and the spray medium 14 stop. This extinguishes the flame,
The extinguished burner gun 7 is overheated by the radiant heat from the inside 15 of the boiler furnace, and is drawn out of the boiler furnace by the automatic insertion / removal device 9 to prevent this. Although not shown in detail, this operation is automatically performed, and is usually performed by compressed air operation or electric power. If the movable part of the automatic insertion / removal device 9 is heated to an allowable temperature or more, it will malfunction and
At last, since it becomes completely inoperable, it is necessary to keep the automatic insertion / removal device 9 below the allowable temperature at all times.

[0012]

However, in conventional oil-fired burners, gas turbine exhaust gas, diesel exhaust gas and the like are usually at a high temperature of 300 to 600 ° C.
It is sent to the burner at a low oxygen concentration of 0 to 18% (dry Vol). Therefore, there are the following problems.

1) The concentration of oxygen contained in exhaust gas and the like sent as combustion air decreases, and stable ignition combustion of the flame cannot be obtained by itself. 2) Since the oil primary air 16 blown into the boiler furnace 15 through the flame stabilizer 6 is at a high temperature, the automatic insertion / removal device 9 of the burner gun 7 malfunctions and eventually becomes inoperable. 3) Fresh air (oxygen concentration = 2)
1%), the volume of combustion air is reduced, the flow velocity of the secondary air nozzle is reduced (diffusion and mixing of fuel and air is reduced), and stable combustion in the boiler furnace 15 cannot be obtained.

Since the present invention has been made in view of such circumstances, stable ignition combustion can be achieved by providing primary air flow rate adjusting means for adjusting the amount of primary air supplied to the primary air nozzle. It is another object of the present invention to provide an oil-fired burner that can avoid a malfunction of the insertion / removal device.

According to the present invention, there is provided a tertiary air flow rate adjusting damper for arranging a tertiary air nozzle outside a secondary air nozzle and coaxially with the nozzle, and for adjusting a flow rate of tertiary air to the tertiary air nozzle. An object of the present invention is to provide an oil-fired burner capable of preventing a decrease in secondary air capacity, maintaining a secondary air nozzle blowing flow rate, and performing stable combustion.

[0016]

According to the present invention, there is provided a primary air nozzle which is disposed in a burner wind box and supplies primary air from the outside into a boiler furnace, and regulates an amount of primary air supplied to the primary air nozzle. Primary air flow rate adjusting means, a secondary air nozzle provided outside and coaxial with the primary air nozzle, and a burner tip is inserted into the boiler furnace on the center axis of the primary air nozzle. A burner gun for injecting fuel oil, an insertion / removal device that holds and inserts and moves the burner gun on the center axis of the primary air nozzle, and is attached to the primary air nozzle and inserts the tip of the burner gun into the boiler furnace. And a flame stabilizing device for stabilizing the flame.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The oil-fired burner of the present invention will be described below in detail. In the present invention, the primary air flow rate adjusting means includes, for example, a blower attached to the outside of a burner wind box, a primary air duct connected to the primary air nozzle via a primary air throat, and a primary air duct. And an air flow control damper for controlling the flow rate of the primary air.

In the present invention, 5 to 15 of the total combustion air is used.
% Of fresh air is preferably sent as combustion air for the burner. The reason is that if the fresh air is less than 5%, the amount of oxygen supplied from the periphery of the burner gun into the boiler furnace decreases, leading to poor ignition or misfire. This is because it leads to poor flame holding.

In the present invention, the temperature of the fresh air is preferably in the range of 50 to 250 ° C., particularly preferably 100 to 150 ° C. The reason is that if the temperature is lower than 50 ° C., the combustion effect is reduced, and if the temperature exceeds 250 ° C., the components such as the automatic insertion / removal device are prevented from being deteriorated by heat.

In the present invention, a tertiary air nozzle is arranged outside and coaxial with the secondary air nozzle, and a tertiary air flow rate adjusting damper for adjusting the flow rate of tertiary air to the tertiary air nozzle is provided. Is preferred. In other words, with such a configuration, the secondary air flow adjusting damper can be adjusted (closed) during the boiler alone operation to prevent a decrease in the secondary air capacity and maintain the secondary air nozzle blowing velocity.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a cross-sectional view of the oil-fired burner according to the present invention, FIG. 2 is a cross-sectional view along line XX of FIG. 1, and FIG. 3 is a cross-sectional view along line YY of FIG. In addition,
The materials, numerical values, and the like of the components in the embodiments are merely examples, and do not specify the scope of the present invention.

The oil-fired burner 20 according to the present embodiment includes a burner wind box 21, a primary air nozzle 22, a secondary air nozzle 23, a tertiary air nozzle 24, a burner gun 25, an insertion / removal device 26, The main component is a vessel (air swirler) 27 and primary air flow rate adjusting means 28.

The primary air nozzle 22 is arranged in the burner wind box 21 on the center axis of the burner wind box 21. The secondary air nozzle 23 and the tertiary air nozzle 24
Are arranged coaxially with the primary air nozzle 22 inside the burner wind box 21 from the nozzle 22 side to the outside.

The burner gun 25 has a primary air nozzle 22
The burner tip is inserted into the boiler furnace 29 and the fuel oil 30 is injected. The insertion / extraction device 26 that holds and inserts and moves the burner gun 25 on the central axis of the primary air nozzle 22 and is connected to the burner gun 25 is connected to the burner gun 25. Here, the burner gun 25 is supplied with an injection medium 31 in addition to the fuel oil 30.

The primary air nozzle 22 is connected to the primary air flow control means 28 via a primary air throat 51. Here, the primary air flow rate adjusting means 28
A blower (not shown) attached to the outside of the burner wind box 21; the primary air nozzle 22;
A primary air duct 32 connected via the first air duct 1 and a primary air flow adjusting damper 34 for adjusting the flow rate of the primary air (fresh air) 33 to the primary air duct 32 are provided.

The flame stabilizer 27 is mounted between the burner gun 25 and the primary air nozzle 22 via a guide pipe 35, and the tip of the burner gun is placed in the boiler furnace 29.
And has a function of stabilizing the flame 36. The flame stabilizer 27, the primary air nozzle 22, the secondary air nozzle 23,
The cross-sectional shapes of the tertiary air nozzle 24 and the like are clear from FIG.

As is apparent from FIG. 3, a secondary air swirl vane 38 that causes the secondary air 42 to swirl is disposed in the secondary air throat 37 formed by the primary air nozzle 22 and the secondary air nozzle 23. Have been. Further, a tertiary air throat 39 formed by the secondary air nozzle 23 and the tertiary air nozzle 24 is provided with a tertiary air swirl vane 40 for causing the tertiary air 43 to swirl. The tertiary air swirl vane 40 has both functions of adjusting the flow rate of the tertiary air and swirling. The tertiary air swirl vane 40
Closing reduces the flow but increases the turn.
Further, the tertiary air throat 39 has a tertiary air duct 4
6 are connected. Here, a blower (not shown) for supplying the tertiary air 43, the tertiary air duct 46, and the tertiary air swirl vane 40 constitute tertiary air flow rate adjusting means.

Reference numeral 41 in FIG. 1 denotes combustion air,
Reference numeral 44 indicates a refractory material for improving ignition, and reference numeral 45 indicates an inner frame (ignition flame).

As described above, the oil-fired burner according to the above embodiment has a primary air nozzle 22,
A secondary air nozzle 23, a tertiary air nozzle 24, a burner gun 25, an insertion / removal device 26, a flame stabilizer (air swirler) 27, a primary air flow rate adjusting means 28, and the like are arranged. It comprises a primary air duct 32 and a primary air regulating damper 34 connected to 22 via a primary air throat 51. Therefore, the following effects are obtained.

That is, the primary air (fresh air) 33 supplied to the flame stabilizer 27 via the primary air throat 51 is given a swirling force by the flame stabilizer 27 and diffused and mixed with fuel to form an inner frame 45. I do. Here, if the inner frame 45 is improved, stable ignition combustion of the flame itself can be maintained. Therefore, G which is sent in as combustion air
Even if the concentration of oxygen contained in the / T or D / G exhaust gas decreases and the flame itself cannot be stably ignited and burned, a small amount (about 10% of the total combustion air) is supplied to the flame stabilizer 27. When the fresh air 33 is supplied and a turning force is applied, a stable inner frame 45 is formed on the front surface of the flame stabilizer, and a stable ignition combustion flame can be formed.

An automatic insertion / removal device 26 having a movable portion
Is a high temperature G / T or D / G exceeding an allowable temperature by introducing a low temperature (100 to 150 ° C.) fresh air 33.
Even if exhaust gas or the like is sent in, no malfunction occurs, and the automatic insertion / removal device 26 itself does not have special specifications.

Further, in the above embodiment, the tertiary air nozzle 2
4, a tertiary air throat 39 connected to the nozzle 24, a tertiary air duct 46, and a tertiary air flow rate adjusting damper 47 for adjusting the flow rate of the tertiary air 43 are arranged.
Therefore, in the boiler independent operation mode, the tertiary air flow rate adjusting damper 47 is closed and the flow rate of the secondary air 42 from the secondary air nozzle 22 is increased to prevent the secondary air blowing flow rate from decreasing and to mix and diffuse fuel. And a stable combustion flame can be maintained.

In the above embodiment, the amount of fresh air with respect to the total combustion air is 10%, and the temperature is 10%.
Although it was 0-150 degreeC, it is not restricted to this. That is, if the fresh air is in the range of 5 to 15% of the total combustion air and the temperature is in the range of 50 to 250 ° C., the same effect as in the above embodiment can be expected.

[0034]

As described above in detail, according to the present invention, stable ignition combustion is achieved by providing a primary air flow rate adjusting means for adjusting the amount of primary air supplied to the primary air nozzle. In addition, it is possible to provide an oil-fired burner that can avoid a malfunction of the insertion / removal device.

According to the present invention, the tertiary air nozzle is arranged outside the secondary air nozzle and coaxially with the nozzle, and the tertiary air flow rate adjusting device controls the flow rate of the tertiary air to the tertiary air nozzle. By providing a damper, it is possible to provide an oil-fired burner that can prevent a decrease in the secondary air capacity, maintain the secondary air nozzle blowing velocity, and achieve stable combustion.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an entire oil-fired burner according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1;

FIG. 3 is a sectional view taken along the line YY of FIG. 2;

FIG. 4 is a sectional view of a conventional oil-fired burner.

FIG. 5 is a sectional view taken along line XX of FIG. 4;

[Explanation of symbols]

 Reference Signs List 20: oil-fired burner, 21: burner wind box, 22: primary air nozzle, 23: secondary air nozzle, 24: tertiary air nozzle, 25: burner gun, 26: automatic insertion / removal device, 27: flame stabilizer (air swirling blade) ), 29: inside the boiler furnace, 30: fuel oil, 32: primary air duct, 34: primary air flow control damper, 37: secondary air throat, 38: secondary air swirl vane, 39: tertiary air throat, 40 ... Tertiary air swirl vane, 41 ... combustion air, 42 ... secondary air, 43 ... tertiary air, 46 ... tertiary air duct, 51 ... primary air throat.

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[Procedure amendment]

[Submission date] June 16, 2000 (2006.1.
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

[0016]

According to the present invention, there is provided a primary air nozzle which is disposed in a burner wind box and supplies primary air from the outside into a boiler furnace, and regulates an amount of primary air supplied to the primary air nozzle. Primary air flow rate adjusting means, a secondary air nozzle provided outside and coaxial with the primary air nozzle, and a burner tip is inserted into the boiler furnace on the center axis of the primary air nozzle. A burner gun for injecting fuel oil, an insertion / removal device that holds and inserts and moves the burner gun on the center axis of the primary air nozzle, and is attached to the primary air nozzle and inserts the tip of the burner gun into the boiler furnace. And a flame stabilizer for stabilizing the flame , wherein the primary air has a total combustion air amount of 5%.
~ 15% fresh air and flue gas
This is an oil-fired burner characterized by using as a combustion air .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Tanigawa 5-717-1, Fukabori-cho, Nagasaki-shi, Nagasaki Sanritsu Heavy Industries, Ltd., Nagasaki Research Institute (72) Inventor Shinichi Sekiguchi 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries, Ltd.Yokohama Works (72) Inventor Shinichi Kato 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd.Yokohama Works (72) Inventor Tatsuo Yokoshi 2-5-2 Marunouchi, Chiyoda-ku, Tokyo No. 1 Mitsuhishi Heavy Industries, Ltd.

Claims (5)

[Claims] A primary air nozzle disposed in a burner wind box for supplying primary air from outside to a boiler furnace; primary air flow rate adjusting means for adjusting an amount of primary air supplied to the primary air nozzle; A secondary air nozzle provided outside and coaxial with the primary air nozzle, and a burner gun that injects a fuel oil by inserting a burner tip into the boiler furnace on a central axis of the primary air nozzle. An insertion / removal device that holds and holds the burner gun and inserts and removes the burner gun on the central axis of the primary air nozzle, and a holder that is attached to the primary air nozzle and inserts the tip of the burner gun into the boiler furnace to stabilize the flame. An oil-fired burner comprising a flame device. 2. The primary air flow rate adjusting means includes: a blower attached to the outside of a burner wind box; a primary air duct connected to the primary air nozzle via a primary air throat; 2. The oil-fired burner according to claim 1, further comprising an air flow control damper for adjusting a flow rate of the primary air. 3. The oil-fired burner according to claim 1, wherein fresh air is sent as burner combustion air in a range of 5 to 15% of the total combustion air. 4. The temperature of the fresh air is 50 to 25.
The oil-fired burner according to claim 3, wherein the temperature is 0 ° C. 5. A tertiary air nozzle is arranged outside and coaxial with said secondary air nozzle, and a tertiary air flow rate adjusting damper for adjusting a flow rate of tertiary air to said tertiary air nozzle is provided. The oil-fired burner according to claim 1, wherein: