JPH08312959A - Pilot burner unit for surface combustion burner - Google Patents

Abstract

PURPOSE: To provide a pilot burner unit for a surface combustion burner improving flame carrying-out at the time of igniting and capable of stably igniting in the combustion burner. CONSTITUTION: The surface combustion burner has a combustion plate 1 at the end of a main burner 2, a pilot burner 6 provided at the downstream of the plate 1 to form a pilot flame in the direction parallel to the combustion plate surface, injects premixed gas to the plate 1 and burns the main burner at the downstream side of the plate, and comprises a pilot gas nozzle 7 at the upstream side of the plate. At the time of burning the pilot burner provided at the down stream of the plate, combustion gas is injected from the nozzle 7 to form a second pilot flame 13 at the surface of the plate at the downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot burner device for a surface combustion burner.

[0002]

2. Description of the Related Art A combustion plate having a large number of holes made of ceramic or metal fiber is provided at the tip of a main burner.
A pilot burner that forms a pilot flame by injecting a premixed gas in a direction parallel to the combustion plate surface is provided downstream of the combustion plate.The fuel gas supplied from the main fuel gas supply pipe and the combustion supplied from the blower There is a surface combustion burner that injects a premixed gas mixed with working air from a combustion plate, ignites a main burner with a pilot flame, and burns on the surface downstream of the combustion plate.

In the case of the above burner, the pilot burner is usually provided so as to be parallel to the combustion plate, and the premixed gas is injected in the direction parallel to the combustion plate. If the air pressure of the mixed gas is low, the pilot flame will flow away from the combustion plate due to the air injected from the combustion plate. When the fuel supply to the main burner is started with the pilot flame and the combustion plate widely spaced and the main burner is ignited, the premixed gas injected from the combustion plate reaches the position of the pilot flame away from the combustion plate. If you don't do this
The heat transfer becomes worse, which causes the vibration of the flame and the explosion in the furnace.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pilot burner device for a surface combustion burner which can improve the transfer of heat during ignition and can perform stable ignition. To do.

[0005]

Means for Solving the Problems A gas-permeable combustion plate is provided at the tip of the main burner, and the combustion plate is provided downstream of the combustion plate.
A pilot burner that forms a pilot flame by injecting a premixed gas in the direction parallel to the combustion plate surface is installed, and the fuel gas supplied from the main fuel gas supply pipe and the combustion air supplied from the blower are mixed. In the surface combustion burner that injects the prepared premixed gas from the combustion plate and burns the main burner on the downstream side of the combustion plate, a pilot gas nozzle is provided on the upstream side of the combustion plate, and the pilot gas nozzle is installed on the downstream side of the combustion plate during combustion. By injecting more combustion gas,
A second pilot flame is formed on the downstream surface of the combustion plate.

[0006]

When the pilot gas nozzle is provided on the upstream side of the combustion plate and the combustion gas is injected from the pilot gas nozzle during the pilot burner combustion, the fuel gas is mixed with the air and is injected from the combustion plate. The premixed gas injected to the downstream side of the combustion plate burns on the surface of the combustion plate immediately below the pilot gas nozzle because the pilot flame is formed by the pilot burner, and forms the second pilot flame. If the second pilot flame is formed on the surface of the combustion plate, the supply of the main side fuel gas is started, and when the premixed gas is injected from the entire surface of the combustion plate, the flame immediately transfers to the surface of the combustion plate, so that it is smooth. The combustion can start.

Although the gap between the pilot gas nozzle and the second pilot flame is open, the mixed gas concentration of the second pilot flame may become unstable due to the diffusion of the fuel gas and the like. Since the pilot flame of the pilot burner injecting the premixed gas with the mixing ratio is performing stable combustion, it is possible to re-ignite immediately even if the second pilot flame is blown out. .

[0008]

An embodiment of the present invention will be described with reference to the drawings.
A combustion plate 1 formed by stacking metal fibers is provided at the tip of the main burner 2, the main fuel gas supply pipe 4 and the main combustion air supply pipe 5 are connected to the main side of the main burner 2, and Is provided with a current plate 3. By opening the main solenoid valve 10 in the middle of the main fuel gas supply pipe 4, the fuel gas sent from the main fuel gas supply pipe 4 and the combustion air sent from the blower 11 upstream of the main combustion air supply pipe 5 are separated. , Mixed in the main burner 2 to become a premixed gas, which is rectified by the rectifying plate 3 and sent to the combustion plate 1, and the premixed gas is injected from the combustion plate 1.

A pilot burner 6 is provided in parallel to the combustion plate 1 on the downstream side of the combustion plate 1 of the main burner 2. A pilot burner mixing chamber 14 is provided on the original side of the pilot burner 6, and a pilot combustion gas supply pipe 8 and a pilot combustion air supply pipe 9 are connected to the pilot burner mixing chamber 14.
The pilot burner 6 injects the premixed gas in which the fuel gas and the combustion air are mixed in the pilot burner mixing chamber 14 in a direction parallel to the combustion plate 1 and burns the premixed gas. Further, a pilot gas nozzle 7 for injecting fuel gas toward the combustion plate 1 is provided upstream of the combustion plate 1 inside the main burner 2.

When the combustion of the main burner 2 is started, the pilot burner 6 is first ignited, and the premixed gas is generated by feeding the fuel gas and the combustion air into the pilot burner mixing chamber 14. The premixed gas is injected from the pilot burner 6 to form the first pilot flame 12 on the downstream side of the combustion plate 1. Further, the fuel gas injected from the pilot gas nozzle 7 reaches the combustion plate 1 while being mixed with the combustion air, is injected downstream of the combustion plate 1 and is ignited by the first pilot flame 12 to be burned on the surface of the combustion plate 1. Form a second pilot flame.

The first pilot flame 12 may be flown in a direction away from the combustion plate 1 because there is air injected from the main combustion air supply pipe 5 and being injected from the combustion plate 1. Since the second pilot flame 13 is present on the surface of the plate 1, when the main solenoid valve 10 is opened to start the combustion of the main burner 2, the first pilot flame 12 and the second pilot flame 13
Because the flame spreads from both, the fire will transfer smoothly. In addition, the second pilot flame 13 is the pilot gas nozzle 7
Although the mixed gas concentration may be unstable at a position away from the first burner, the first pilot flame 12 of the pilot burner 6 maintaining the optimum mixing ratio in the pilot burner mixing chamber 14 causes a momentary change. Even if it blows out, it will be ignited again.

[0012]

EFFECTS OF THE INVENTION By carrying out the present invention, it is possible to improve the transfer of heat when the surface combustion burner is ignited, and to perform stable ignition.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Combustion Plate 2 Main Burner 3 Rectifier Plate 4 Main Fuel Gas Supply Piping 5 Main Combustion Air Supply Piping 6 Pilot Burner 7 Pilot Gas Nozzle 8 Pilot Combustion Gas Supply Piping 9 Pilot Combustion Air Supply Piping 10 Main Solenoid Valve 11 Blower 12 First Pilot Flame 13 Second pilot flame 14 Pilot burner mixing chamber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuya Kurimoto 3-13-1, Minamisenju, Arakawa-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Tomohiro Morita 3-13-1, Minamisenju, Arakawa-ku, Tokyo Tokyo Gas stock company

Claims (1)

[Claims] 1. A gas-permeable combustion plate is provided at the tip of a main burner, and a pilot burner for injecting a premixed gas in a direction parallel to the combustion plate surface to form a pilot flame is provided downstream of the combustion plate. Fuel gas supplied from the main fuel gas supply pipe and premixed gas, which is a mixture of combustion air supplied from a blower, are injected from the combustion plate, and burned in the surface combustion burner that burns the main burner on the downstream side of the combustion plate. A pilot gas nozzle is provided on the upstream side of the plate, and during combustion of a pilot burner provided on the downstream side of the combustion plate, the combustion gas is injected from the pilot gas nozzle to form a second pilot flame on the downstream surface of the combustion plate. Pilot burner device for surface combustion burner.