JP5459836B2 - Burner tile for auxiliary burner in combustion chamber of waste gasification melting furnace - Google Patents

Description

  The present invention relates to a burner tile applied to an auxiliary burner disposed in a combustion chamber for burning a gas generated in a waste gasification melting furnace.

  Exhaust gas containing flammable dust and flammable gas discharged from a waste gasification and melting furnace that melts waste such as general waste and industrial waste is installed downstream of the waste gasification and melting furnace. The high temperature exhaust gas after combustion in the combustion chamber is recovered by a waste heat boiler.

  In the combustion chamber, an auxiliary burner is provided in addition to a main burner that burns exhaust gas containing combustible dust and combustible gas. The auxiliary burner is used for the purpose of maintaining the flame temperature in order to prevent the generation of dioxins due to the temperature rise of the combustion chamber before the start of the melting furnace operation and the reduction of gas calories generated during the operation. The auxiliary burner is usually provided on the side wall of the combustion chamber, and oil or gas is used as fuel (see Patent Document 1).

  As shown in FIG. 3, the auxiliary burner used in the combustion chamber of Patent Document 1 has a burner port 12 formed integrally with the refractory 3 on the side wall of the combustion chamber 1. Fuel and combustion air are supplied to the auxiliary burner 6, and a flame is generated in the burner port 12 formed by the refractory 3 on the side wall of the combustion chamber 1.

  However, a large amount of dust accompanies the gas generated from the waste gasification and melting furnace, and a part of this dust is melted in the combustion chamber to form adhering dust 16 on the combustion chamber side wall, and around the outlet of the burner port 12. Will be blocked.

  In order to prevent the outlet of the burner port from being blocked, in the melting furnace field, as an auxiliary burner, slag adhering to the furnace inner opening of the auxiliary burner is moved forward inside the furnace and dropped at the tip of the swirler. It has been proposed to facilitate ignition during use of the auxiliary burner (see Patent Document 2).

JP-A-2005-90869 Japanese Patent Laid-Open No. 9-222218

In the state where the auxiliary twist burner 6 is not used in the combustion chamber, only combustion air is supplied to the burner port 12 to prevent dust from entering and prevent dust from being accumulated in the burner port 12. However, as shown in FIG. 3, when the adhering dust 16 surrounds and closes the outlet periphery of the burner port 12, normal flame formation in the burner port is hindered, and the temperature in the burner port becomes high. The invading dust is melted to form the clinker 17, or the refractory forming the burner port 12 is melted to the area indicated by the broken line in FIG. 3 to deteriorate the durability, and the combustion of the auxiliary burner 6 is further increased. There existed problems, such as making it worse, repeating misfire, or generating unburned.

  Further, since the conventional burner port is integrally formed with the refractory on the side wall of the combustion chamber, when repairing a burner port that has been melted down, the combustion chamber is cooled and then entered the combustion chamber. There was a need to repair. For this reason, the non-durable burner port has to be repaired by frequently suspending the combustion chamber, which causes a problem that stable operation over a long period of time becomes impossible.

  Further, the auxiliary burner 1 of Patent Document 2 has a problem that the structure is complicated because a mechanism for advancing the swirler inside the furnace is required.

  Therefore, the present invention can prevent dust adhesion around the outlet of the auxiliary burner port and improve the durability of the burner tile in the burner tile applied to the auxiliary burner of the combustion chamber of the waste gasification melting furnace. It is intended to provide a burner tile with a simple structure.

The burner tile of the present invention is supported on the side wall of a combustion chamber for burning exhaust gas containing combustible dust and combustible gas discharged from a waste gasification melting furnace for melting waste, and only combustion air when not in use. In a burner tile of a combustion chamber of a waste gasification melting furnace applied to an auxiliary burner that burns fuel oil or fuel gas, a burner formed of a refractory having a burner port that supports the flame of the auxiliary burner The tile is supported by being surrounded by a refractory material on the side wall of the combustion chamber, and an annular air header chamber is provided on the auxiliary burner side of the burner port so as to surround the burner port and to supply air from the outside. A number of air pipes from the air header chamber are installed in the flow path formed in the object, and the air pipes are spaced around the outlet of the burner port. The air supplied from and combustion outside provided serial burner tile, when using the auxiliary burner and when not in use, dust adheres to and ejected toward the combustion chamber to the straight direction to the burner port outlet surrounding the injection force of the air It is characterized by communicating with a plurality of air outlets for preventing the above.

In the above-described configuration, characterized in that the bar Natairu is detachable relative refractory of the side wall of the combustion chamber.

  In the present invention, a number of air outlets are provided around the burner port outlet, and dust is prevented from adhering to the burner port outlet by the injection force of air that is jetted from the air outlet and goes straight through the combustion chamber, thereby closing the port outlet. As a result, the normal flame can be maintained, and the formation of clinker in the burner port due to the high temperature of the burner port, and the refractory damage of the burner tile can be prevented. . Moreover, since air is made to advance straight from the air outlet, dust adhesion can be prevented with a simple structure.

  Further, according to the present invention, since the air piping connected to the air outlet has the support function of the burner tile refractory and the cooling effect of the refractory, the durability of the burner tile refractory can be greatly improved.

  In addition, the burner tile can be detached from the refractory in the combustion chamber from the outside, and the burner tile is separated from the refractory in the combustion chamber, thereby eliminating the need for burner tile repair in the conventional combustion chamber. It can be done easily.

It is sectional drawing which shows the Example of the burner tile structure of this invention. It is an AA arrow line view of FIG. 1 which shows arrangement | positioning of an air blower outlet. An installation example of a conventional auxiliary burner is shown. It is a figure which shows arrangement | positioning and cross-sectional shape of an air blower outlet. It is a figure which shows arrangement | positioning of an air blower outlet.

  An embodiment of the burner tile structure of the present invention will be described with reference to the drawings.

In FIG. 1, a combustion chamber 1 disposed downstream of a waste gasification melting furnace has a refractory 3 lined on an outer iron skin 2. A burner tile 5 made of refractory material is supported by an opening 4 formed in the iron skin 2 and the refractory material 3 of the combustion chamber 1. An auxiliary combustion burner 6 is attached to the burner tile 5, and fuel and combustion air are supplied to the auxiliary combustion burner 6 .

  The refractory material of the burner tile 5 is covered with a rear iron skin 7 on the side where the auxiliary burner 6 is attached and an iron skin 8 on the outer periphery of the burner tile. The burner tile 5 is detachably joined to the iron skin 2 of the combustion chamber by a flange 9.

  Further, an annular air header chamber 10 surrounded by hardware is formed, and air is supplied from the air supply pipe 11 to the air header chamber 10 from the outside.

  In the burner tile 5, a plurality of air outlets 13 are provided around the outlet of the burner port 12 so as to surround the outer periphery of the burner port 12. A large number of air pipes 15 are installed from the air header chamber 10 to the flow path 14 formed in the refractory of the burner tile 5 and communicated with the air outlet 13 around the outlet of the burner port 12. The air ejected from the air outlet 13 around the outlet of the burner port 12 is to prevent the adhering dust 16 from being formed around the burner port due to the injection force, and may be a gas other than air. Air to be ejected from the air outlet 13 into the combustion chamber is ejected in the normal direction of the side wall of the combustion chamber 1 and goes straight into the combustion chamber as it is.

When the auxiliary combustion burner 6 is used, combustion air is supplied to the burner body , and at the same time, air is supplied from the air supply pipe 11 to the air header chamber 10.

When the auxiliary burner 6 is not used, only the combustion air is supplied to the auxiliary burner 6 to prevent dust accumulation in the burner port 1. Further, air is blown out simultaneously from the air outlet 13 to prevent dust from adhering around the outlet of the burner port 12 even when not in use.

  The air pipe 15 has its own cooling effect by blowing out air, but it is desirable to provide it in a more conservative manner than the combustion chamber 1 in order to avoid the influence of heat from the combustion chamber 1. The air outlet 13 is formed by opening to the burner tile 5.

  Further, in order to prevent dust adhering to the combustion chamber side wall of the waste gasification melting furnace from adhering around the air outlet 13, the flow rate (pressure) of the air blown out from the air outlet 13 depends on the amount of adhering dust 16 and the adhesion force. Can be adjusted. The air outlet 13 of the present invention multiplexes the elliptical air outlet 13 as shown in FIG. 4 or the burner port 12 as shown in FIG. 5 in consideration of the amount of adhering dust 16 and the adhesive force. It is good also as the air blower outlet 13 surrounded by.

1: Combustion chamber 2: Iron skin 3: Refractory material 4: Opening 5: Burner tile 6: Auxiliary burner 7: Back iron skin 8: Outer iron skin 9: Flange 10: Air header chamber 11: Air supply pipe 12: Burner Port 13: Air outlet 14: Flow path 15: Air piping 16: Adhering dust 17: Clinker

Claims (2)

Fuel oil that is supported on the side wall of a combustion chamber that burns exhaust gas containing combustible dust and combustible gas discharged from a waste gasification melting furnace that melts waste, and is supplied with only combustion air when not in use Or in the burner tile of the combustion chamber of the waste gasification melting furnace applied to the auxiliary burner for burning the fuel gas,
A burner tile formed of a refractory having a burner port that supports the flame of the auxiliary burner is surrounded and supported by the refractory on the side wall of the combustion chamber;
An annular air header chamber that surrounds the burner port and is supplied with air from the outside is provided on the auxiliary burner side of the burner port,
A number of air pipes are installed from the air header chamber in the flow path formed in the refractory of the burner tile,
The air pipe is provided in the burner tile with a space around the outlet of the burner port, and air supplied from outside the combustion chamber is directed straight toward the combustion chamber when the auxiliary combustion burner is used or not used . A burner tile characterized in that it is in communication with a plurality of air outlets for preventing dust from adhering to the periphery of the burner port outlet by jetting air.   2. The burner tile according to claim 1, wherein the burner tile is detachable from the refractory on the side wall of the combustion chamber.

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