JP2003222308A - Burner container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner container which does not block formation of a flame by a burner nozzle and can stably restrain intrusion of radiation heat from a furnace and blow-out of excessive air from a dummy port. <P>SOLUTION: At the dummy port 60 provided at this burner container, a stainless steel plate 70 is arranged almost covering the dummy port 60 inside the dummy port 60 opposing the furnace, and at a portion corresponding to the end on the mounting position side of the stainless steel plate 70 (in concrete, inside of side plates 61 and 62, a top plate 64 and a bottom plate 65), a plurality of stoppers 66 (consisting of claws 66a and 66b) are arranged for supporting the stainless steel plate 70. On the back side of an opposing part of the stainless steel plate 70 against the furnace, a drop preventing mechanism 80 for preventing drop of the stainless steel plate 70 into the furnace is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner accommodating device for accommodating a burner nozzle provided in a boiler furnace, a chemical industrial furnace or the like.

[0002]

2. Description of the Related Art Conventionally, as a boiler furnace used in, for example, a thermal power plant, there is known one having a furnace for vaporizing water in a superheater and a burner accommodating device arranged on the wall of the furnace. . This type of burner accommodating device includes a plurality of burner ports provided with burner nozzles that eject a mixed flow of fuel and air (or oxygen) to form a flame, and a dummy port provided between the burner ports. There is something. The reason why the dummy port is provided between the burner ports is that the burner nozzle and the auxiliary air nozzle for combustion are not required at the relevant portion by design. In the conventional case, the dummy port has a refractory material (for example, ultra high purity alumina (trade name: T # 5).
By filling 962)), radiant heat from the furnace wall is prevented from entering.

[0003]

However, the above-mentioned burner accommodating apparatus has a technical problem that the by-product generated by combustion adheres to and grows on the refractory material, and inhibits the formation of flame by the burner nozzle. Was given. In particular, when coal is used as the fuel, clinker (coal ash) as a by-product easily adheres and grows, so that the above-mentioned technical problems occur remarkably. Therefore, the present inventor studied using a metal plate instead of the refractory material and welding the metal plate and the dummy port to close the dummy port. However, since the metal plate and the dummy port have different coefficients of thermal expansion and temperature conditions, the metal plate may be deformed by the radiant heat from the furnace, or the welded part between the metal plate and the dummy port may be peeled off and the metal plate may be removed from the dummy port. There was a problem in that it fell off, allowing radiant heat from the furnace to enter and allowing excess combustion air to be ejected from the dummy port. Further, the refractory material has a drawback that the clinker is apt to adhere, and when the clinker is deposited on the dummy port portion, there is a problem in that the clinker interferes with the nozzle when adjusting the angle of the burner nozzle and cannot operate.

The present invention has been made in order to solve the above technical problems, and its purpose is to prevent the formation of flames by a burner nozzle, and to prevent the entry of radiant heat from a furnace and the dummy port. It is an object of the present invention to provide a burner accommodating device that can stably suppress the excessive combustion air from being ejected from the device and can smoothly operate the burner nozzle angle adjusting device when the device is provided.

[0005]

Based on the above object, the inventors of the present invention have made earnest studies, and as long as the method for fixing the metal plate to the dummy port (for example, the above-mentioned welding) is adopted, We have come to the knowledge that we cannot solve the technical problems. The present invention provides a burner provided with a plurality of burner ports arranged on a furnace wall and provided with a burner nozzle for ejecting a mixed flow of fuel and air to form a flame, and a dummy port provided between the burner ports. In the storage device, the dummy port
It is characterized by comprising a metal plate arranged on the furnace wall and a support member supported so that the metal plate can be expanded and contracted by heat. In the present invention, since the metal plate is supported by the support member so as to be able to expand and contract thermally, the situation in which the metal plate is deformed due to the temperature increase or the temperature decrease does not occur. In addition, since the dummy port and the metal plate are not fixed to each other, the metal plate does not crack when the temperature rises or falls. Furthermore, because a metal plate is used,
Adhesion and growth of by-products generated with combustion can be suppressed, and the effect of preventing the clinker from adhering by the jetted air becomes great.

If a metal plate having ventilation holes is used as the metal plate of the present invention, it is possible to prevent an excessive temperature rise of the dummy port. Furthermore, if the supporting member of the present invention is of a type that supports the metal plate by sandwiching the side edges, the metal plate can be supported with a simple structure. Furthermore, if a mooring member for mooring the metal plate so that it can be thermally contracted is provided between the rear side of the furnace wall of the metal plate and the dummy port body, the metal plate will not fall off from the dummy port. Can be prevented. The present invention is particularly effective when applied to a type that uses a fuel made of coal as a raw material. This is because the clinker tends to adhere when burning coal.

Further, according to the present invention, a plurality of burner ports arranged on the furnace wall and provided with burner nozzles for ejecting a mixed flow of fuel and air to form a flame, and dummy ports provided between these burner ports are provided. In the burner accommodating apparatus including the above, the dummy port is provided with a lid member that is arranged on the furnace wall and is movably attached to the dummy port, and that suppresses adhesion of residue after combustion. It is characterized by that. In the present invention, since the lid member is attached so as to be relatively movable with respect to the dummy port, a situation in which the lid member is deformed due to temperature rise or temperature drop does not occur. Also,
Since the dummy port and the lid member are not fixed to each other, the lid member does not crack when the temperature rises or falls. Further, due to the characteristics of the lid member, it is possible to suppress the adhesion and growth of by-products generated with combustion.
The lid member according to the present invention is not limited to the type that completely covers the dummy port, but may include the type that a part thereof is opened. In addition, the lid member may be appropriately selected as long as it is made of metal and has a property (for example, a ceramic material) having a characteristic of suppressing adhesion of the residue after combustion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the accompanying drawings. FIG. 1 shows an embodiment of a burner housing device to which the present invention is applied. This burner housing device is used, for example, in a boiler of a thermal power plant. 1A is a front view of the burner air box seen from the furnace (not shown) side, and FIG. 1B is a side view thereof. In the figure, the burner accommodating apparatus according to the embodiment of the present invention is configured as an integrated type that is continuous in the furnace height direction, and a pulverized coal burner 11 that ejects pulverized coal and air to form a flame is used. A pulverized coal burner port 10 provided, a COG burner port 20 provided with a COG burner 21 that burns coke oven gas (COG), a Mix gas burner port 30 provided with a Mix gas burner 31 that burns Mix gas, These pulverized coal burner port 10,
COG burner port 20 and Mix gas burner port 3
0 is accommodated in the frame 40. In the pulverized coal burner 11, reference numeral 11a indicates a weak burner and reference numeral 11b indicates a conc burner. Reference numeral 50 is an air nozzle for supplying air to each of these burners. Then, in the frame 40, a dummy port 60 is provided in a gap portion where the pulverized coal burner port 10, the COG burner port 20, the Mix gas burner port 30 and the air nozzle 50 are not provided.

FIG. 2 is an enlarged view of the dummy port 60. Here, FIG. 2A is an upper sectional view of the dummy port 60, FIG. 2B is a side sectional view, FIG. 2C is a front view, and FIG. 2D is a front surface of a stainless plate 70 described later. It is a figure. In the figure, the dummy port 60 includes side plates 61 and 62 provided on the side and a rear plate 6 provided on the rear.
3, a top plate 64 provided on the upper side, and a bottom plate 65 provided on the lower side. A stainless steel plate 70 is arranged inside the dummy port 60 facing the furnace so as to cover the dummy port 60 substantially. As shown in FIG. 2D, this stainless steel plate 70 has a diameter of φ
A perforated plate having a large number of fifteen holes 71 is used. Further, the size of the stainless steel plate 70 is set to be smaller than that of the dummy port 60 by, for example, about 20 mm so that a slight gap is formed (see FIG. 2C).

Next, a method of attaching the stainless plate 70 to the dummy port 60 will be described. In the present embodiment, a portion (specifically, side plates 61, 62, a top plate 64, a bottom plate 65) corresponding to the end of the stainless plate 70 at the attachment position side.
Inside), a plurality of stoppers 66 (composed of claws 66a and 66b) for supporting the stainless steel plate 70 are provided. Here, the thickness of the stainless plate 70 is set to 8 mm, and the distance between the claws 66a and 66b is set to 22 mm.
The stainless plate 70 has a stopper 66 with a gap.
It is supposed to be supported by.

On the rear surface side of the stainless plate 70 facing the furnace, a drop-out prevention mechanism 80 for preventing the stainless plate 70 from falling into the furnace is provided. The fall prevention mechanism 80 has a base plate 81 attached to the bottom plate 65 of the dummy port 60 and a base plate 81 having a hole 82a.
The first arm 82 attached to the upper side, the second arm 83 having the hole 83a attached to the back surface of the stainless steel plate 70, and the hole 82a of the first arm 82 and the hole 83a of the second arm 83 swing. It has a shaft 84 (specifically, a bolt 84a and a nut 84b) that is freely fastened.

In the burner accommodating apparatus according to the present embodiment, the stainless steel plate 70 closes the dummy port 60. Therefore, the pulverized coal burner 11 and the COG burner 2 are used.
1. Even when a flame is formed by the Mix gas burner 31 and combustion is performed, it is possible to avoid a situation in which a by-product such as a clinker adheres to the stainless steel plate 70. Therefore, the formation of flames by the burners is not hindered, stable flames can be formed for a long period of time, and when the burner nozzle angle adjusting mechanism is provided, the operation can be smoothed. It will be possible.

Further, the size of the stainless plate 70 is set smaller than that of the dummy port 60, and the stopper 66 is provided.
Since the stainless steel plate 70 is supported in a state where there is a gap, the stainless steel plate 70 can be thermally expanded and contracted, and even when the stainless steel plate 70 is thermally expanded by combustion, the stainless steel plate 70 is not deformed. Does not happen.

Further, the stainless plate 70 has a fall-prevention mechanism 8 attached thereto.
Since 0 is attached, the stainless steel plate 70 does not fall into the furnace. Further, since the stainless steel plate 70 is swingable by the dropout prevention mechanism 80, the stainless steel plate 70 does not deform due to thermal expansion and contraction.

Furthermore, a large number of holes 7 are formed in the stainless steel plate 70.
Since 1 is opened, a predetermined amount of air can be made to flow in the dummy port 60, and as a result, an excessive temperature rise in the dummy port 60 can be prevented, and the blast of air causes the clinker to flow. The anti-adhesion effect is also increased.

In this embodiment, the dummy port 60 is used.
Although the stainless steel plate 70 is arranged inside of the dummy port 60, it is not limited to this and may be arranged so as to be exposed to the outside of the dummy port 60, for example. Further, the material of the plate is not limited to stainless steel, and can be appropriately selected depending on the by-product generated by combustion, the temperature in the furnace, and the like.
Further, other than this, unless departing from the gist of the present invention,
The configurations described in the above embodiments can be selected or changed to other configurations as appropriate.

[0017]

As described above, according to the burner accommodating apparatus of the present invention, since the dummy port is closed by the metal plate, the adhesion of by-products such as clinker caused by combustion is suppressed. Therefore, it is possible to prevent the flame formation by the burner nozzle from being hindered. And
By preventing the adhesion of the by-products, the operation of the burner angle adjusting device, if provided, becomes smooth.
Further, since the metal plate is supported by the support member so that it can be expanded and contracted by heat, it is possible to prevent deformation of the metal plate and the like, and it is possible to stably suppress radiant heat from entering the furnace. Further, it is possible to suppress the excessive ejection of combustion air from the dummy port. Further, according to the burner accommodating apparatus of the present invention, since the dummy port is closed by the lid member, it is possible to suppress the adhesion and growth of by-products generated by the combustion, and to prevent the flame from being formed by the burner nozzle. It can be prevented from being hindered. Also, since the lid member is attached so as to be movable relative to the dummy port, deformation of the lid member due to thermal expansion and contraction can be prevented, and radiant heat from the furnace enters and excess combustion air is ejected from the dummy port. When the burner nozzle angle adjusting device is provided, the operation can be smoothly performed. Further, according to the burner accommodating apparatus of the present invention, the metal plate or the lid member that closes the dummy port is a perforated plate, so that the effect of preventing the clinker from adhering can be enhanced.

[Brief description of drawings]

FIG. 1 is an overall view of a burner accommodating device to which the present invention is applied, in which (a) is a front view seen from the furnace side and (b) is a side view thereof.

FIG. 2 (a) is a cross-sectional top view of a dummy port, (b).
Is a side sectional view thereof, (c) is a front view, and (d) is a front view of a stainless plate.

[Explanation of symbols]

10 ... Pulverized coal burner port, 11 ... Pulverized coal burner, 20
… COG burner port, 21… COG burner, 30… M
ix gas burner port, 31 ... Mix gas burner, 40
… Frame, 50… Air nozzle, 60… Dummy port,
66 ... Stopper, 70 ... Stainless steel plate, 71 ... Hole, 80
… Shedding prevention mechanism

Claims (6)

[Claims] 1. A plurality of burner ports arranged on a furnace wall and provided with burner nozzles for ejecting a mixed flow of fuel and air to form a flame, and a dummy port provided between the burner ports. In the burner accommodating apparatus, the dummy port is provided with a metal plate arranged on the furnace wall and a supporting member for supporting the metal plate so as to be thermally expandable and contractible. 2. The burner accommodating apparatus according to claim 1, wherein the metal plate has ventilation holes. 3. The burner accommodating apparatus according to claim 1, wherein the supporting member supports the side end of the metal plate by sandwiching it. 4. A mooring member for mooring the metal plate such that the metal plate is heat-shrinkable is provided between the back surface side of the furnace wall of the metal plate and the dummy port body. The burner housing device according to 1. 5. The burner accommodating apparatus according to claim 1, wherein the fuel is made of coal as a raw material. 6. A plurality of burner ports, which are arranged opposite to the furnace wall and which are provided with burner nozzles for ejecting a mixed flow of fuel and air to form a flame, and a dummy port provided between the burner ports. In the burner accommodating device, the dummy port is provided with a lid member that is disposed on the furnace wall and is movably attached to the dummy port, and that suppresses adhesion of residue after combustion. A burner housing device characterized by the above.