JPH0421087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a pulse burner used as a heating device for industrial, commercial, or home water heaters, hot air fans, and the like.

Conventional configuration and its problems Pulse burners can be used as combustors with high heat exchange efficiency because the flow rate of combustion gas is high and pulsating.Furthermore, since they do not require a power source except for startup, running costs are reduced. It was promising as a combustor with low energy consumption. Due to its simple structure, fuel is supplied to the combustion chamber from fuel jet ports provided on the circumference of the cylindrical side, and combustion air is supplied to the combustion chamber from air passages provided around the fuel cylinder. A pulse burner was often used. 1 to 3 show conventional examples thereof, and 2 is a combustion chamber. First of all,
As shown in FIG. 1, when a fuel injection array 1 having a large number of fuel injection ports a is located within a combustion chamber 2, combustion air can flow in easily. However, since the fuel gas is ejected from the narrow fuel injection port a at high speed, the flame is formed in a space away from the fuel injection port a, and the position of the flame becomes unstable. Further, as shown in FIG. 3, when the fuel jet nozzle row 1 is located in the air passage 3, the fuel collides with the air passage wall 4, mixes with air at the collision part,
A flame is formed in the air passage including the collision part and in the combustion chamber. At this time, the flame in the air passage 3 promotes stabilization of the flame in the combustion chamber 2. However, when a flame is formed in the air passage 3, the temperature inside the air passage 3 rises and obstructs the inflow of combustion air into the combustion chamber 2, resulting in a lack of air in areas where the amount of combustion is large. It burns and releases a lot of unburned gas. Furthermore, as shown in FIG. 2, when the fuel jet nozzle row 1 is located at the boundary surface 5 between the combustion chamber 2 and the air passage 3, the fuel gas collides with the air passage 3 at a position close to the combustion chamber 2, and the boundary surface 5
Forms a stable flame nearby. Since there are few flames in the air passage 3, combustion air is not obstructed from entering the combustion chamber 2. However, in this position, the positional relationship between the boundary surface 5 and the fuel injection port a is limited to an extremely narrow range, which is inconvenient in terms of manufacturing.

OBJECTS OF THE INVENTION The present invention corrects the problems of the prior art and provides a pulse burner that has a wide combustion range and allows easy setting of the position of the fuel injection port.

Structure of the Invention In order to achieve the above object, the present invention provides at least two rows of fuel injection ports on the circumference of the side surface of a fuel cylinder, one row of fuel injection ports is located in the combustion chamber, and the other row is located in the air passage. Located in

DESCRIPTION OF EMBODIMENTS In FIG. 4, 6 is a pulse combustor, 7 is a combustion chamber, 8 is a tail pipe, 9 is an air passage, 10 is an air passage wall, 11 is an air chamber, 12 is an air pipe, 1
3 is an air valve, 14 is a fuel cylinder, 15 and 16 are rows of fuel injection ports a, 17 is a spark plug, 18 is combustion air, 19 is a fuel gas, 20 is a gas valve, 2
1 is a flame. The above configuration constitutes a pulse burner.

The operation of such a pulse combustor will be explained. The fuel gas 19 passes through a gas valve 20, and then passes through a fuel injection port array 15, 16 consisting of a large number of fuel injection ports a.
is supplied to the combustion chamber 7.

Combustion air 18 is supplied from a blower (not shown) and flows into the combustion chamber 7 through the air valve 13, the air pipe 12, the air chamber 11, and the air passage 9.
The fuel gas and combustion air supplied to the combustion chamber 7 become a mixture, which explodes and burns due to the discharge of the spark plug 17. Due to the explosion, the pressure within the combustion chamber 7 increases, the air valve 13 and the gas valve 20 close, and the supply of the fuel gas 19 and combustion air 18 is stopped. The hot combustion gas 22 is discharged through the narrow tail pipe 8 at high speed.

When the combustion gas 22 passes through the tail pipe 8, the pressure inside the combustion chamber 7 becomes negative, the air valve 13 and the gas valve 20 are opened, and the combustion air 18 and fuel gas 19 are sucked into the combustion chamber 7. At this time, the high temperature combustion gas in the combustion chamber 7 causes the mixture to explode. Then, similar explosions occur one after another, resulting in a pulse combustion state. When pulse combustion occurs, fuel gas 1
9, combustion air 18 is automatically sucked even when the blower is stopped.

As shown in FIG. 5, one side 16 of the fuel injection nozzle array consisting of a large number of fuel nozzles a is located in the combustion chamber 7,
The other 15 is located in the air passage 9. These fuel nozzle rows 15 and 16 are provided on the circumference of the side wall of the fuel cylinder 14, and the fuel nozzle 15 on the air passage side should have the same or smaller ejection amount than the fuel nozzle 16. good.

In this embodiment, as shown in FIG. 5, a fuel injection port array 15 is provided so as to be located in the air passage 9.
The fuel gas ejected from the fuel ejection port array 15 mixes with combustion air within the air passage 9. A part of it forms a flame in the air passage 9, and the rest forms a flame in the combustion chamber 7. The fuel gas often impinges on the air passage wall 10, so that the mixing of the fuel gas and the combustion air is facilitated. be done.

In this collision part, the flow rate of the fuel is slow, and the mixture of the fuel gas 19 and the combustion air 18 in the air passage 9 is good, so that the flame in the air passage 9 is stable. The fuel gas 19 ejected from the fuel injection port array 16 forms a flame within the combustion chamber 7, but this flame is stabilized by the flame within the air passage 9.

In this embodiment, since only a portion of the fuel is combusted in the air passage 9, the temperature rise within the air passage 9 is also small and the inflow of combustion air is inhibited and is extremely small.

Effects of the Invention As explained above, the present invention has the following effects.

(1) At least two rows of fuel injection ports are used to separate the main combustion in the combustion chamber and the auxiliary flame in the air passage, widening the allowable size range of the burner.

(2) The combustion range is wider at lower combustion rates, making it easier to use and adjusting the installation conditions (upwards, downwards,
(horizontal orientation), it is less susceptible to effects such as thermal drafts and stable combustion can be obtained.

[Brief explanation of drawings]

1 to 3 are sectional views showing conventional examples.
FIG. 4 is a sectional view of a main part of an embodiment of the present invention.
FIG. 5 is a sectional view showing the details. 6... Pulse burner, 7... Combustion chamber, 8... Tail pipe, 9... Air passage, 15, 16... Fuel jet nozzle row, 21... Flame.

Claims (1)

[Claims] 1. A fuel cylinder having a large number of fuel injection ports protrudes into the combustion chamber through an air passage connected to the combustion chamber, and the fuel injection ports are formed in at least two rows on the circumference of the fuel cylinder, and one A pulse burner in which one row of fuel jets is located in the combustion chamber and the other row is located in the air passage.