JPS599014B2 - pilot burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piping burner used for igniting combustion devices such as various industrial burners, and more specifically, the present invention relates to at least two channels through which combustible gas flows simultaneously, and An ignition means provided at the inlet end of at least one of the flow channels communicates with the outlet of each flow channel at one end to concentrate the flammable gas, and the other end releases the flame to the outside.Main combustion a tube, in which the combustible gas is flowed into each channel at a speed greater than the maximum combustion velocity of the gas, in which case the flammable gas in at least one channel is ignited by the ignition means, and as a flame conduit, The flame accompanying the combustion of the gas is transferred to the main combustion pipe, and the transferred flame ignites the combustible gas that is released from other channels in the main combustion pipe that are not ignited, and is further released from the main combustion pipe to the outside. This invention relates to a pipe fitting that can emit a flame and reliably ignite a combustion device from a distance.

In general, combustion equipment is used for a variety of purposes, such as heating furnaces and heat treatment in steel plants, heating furnaces in petrochemical equipment, various processing equipment, various incinerators, and various boilers.

In recent years, there has been a tendency for combustion devices to become larger and more complex.

However, as a result, the burner section or burner operating section of a combustion device is becoming a place with a poor environment, and is also becoming an inconvenient place for remote control.

As a result, it is obvious that workability and stability deteriorate.

In order to cope with this problem, various studies have been conducted on the pipe burner used for igniting the main burner of a combustion device.

Pilot burners, which have been widely used in the past, consist of a combustion tube that generates a flame, a mixing chamber that sends flammable gas to the combustion tube, and a spark plug or manual ignition hole installed in a flow path near the mixing chamber. has been done.

The flame outflow end of this combustion tube is attached near the main burner, and is configured to emit a flame of combustible gas ignited by a spark plug or a manual ignition torch burner toward the main burner.

Using such a pipe burner, the flame is guided deep into the burner section to ignite the main burner.

However, the conventional pie-neck burner as described above does not provide a fundamental solution to improving workability and safety during operation of a combustion apparatus, and has the following drawbacks.

f) There is a structural limit to the length that can be ignited by a pipe-cut burner, and there are disadvantages in that it cannot often be used for burners or ignition parts with longer insertion depths.

In other words, in the case of a pie mouth burner that is longer than the limit,
If the distance between the ignition position of the pilot burner and the ignition position of the main burner is too long, the flame or high-temperature combustion gas ignited and burned at the ignition position will be cooled while flowing in the combustion tube.

As a result, the flame cannot be emitted from the flame outlet end of the pipe burner, and the main burner will not ignite.

(2) In order to ensure the ignition of the main burner, it is necessary to use a large-capacity pipe burner with a large diameter, which makes it difficult to secure installation space, and it is necessary to provide a special shape to the optimal position. The drawback is that it is difficult to attach it to any desired position.

(3) In the case of manual ignition, the ignition part of the pie tip burner is located in a very hot position close to the main burner, which has the drawback of extremely poor workability.

Additionally, manual ignition has the disadvantage that it is unsuitable when the igniter is located at a high, remote, or dangerous location.

(4) In the case of igniting a spark plug, high-voltage wiring must be carried out to the spark plug, which is in a high-heat location, and the insulation part of the wiring wire is likely to deteriorate due to heat, which is unfavorable from a safety standpoint. There were drawbacks.

Furthermore, although shielded wires or the like are generally used for this electric wire to prevent the generation of noise radio waves, the shielded wires and the like lack heat resistance and strength, resulting in a disadvantage in that they are inferior in terms of lifespan and safety.

The present invention has been made in view of the above-mentioned drawbacks and to effectively eliminate them.

The object of the present invention is to provide at least two channels through which combustible gas flows simultaneously, an ignition means provided at the inflow end of at least one of these channels, and an ignition means for each channel. Consists of a main combustion pipe, one end of which communicates with the outlet to concentrate the flammable gas, and the other end of which directs the flame to the outside, allowing the flammable gas to flow into each channel at a speed greater than the maximum combustion speed of that gas. At that time, the ignition means ignites the combustible gas in at least one flow path, the flame accompanying the combustion of the gas is transferred within the flame conduit to the main combustion inlet, and the transferred flame ignites the flame conduit. To provide a pipe-cut burner which can ignite flammable gas released from another flow path at a tip part, and further emit a flame to the outside from a main combustion pipe, thereby surely igniting a combustion device from a conical part. .

Further, it is an object of the present invention to form a hole for an ignition port in the wall of the flow path in the case of manual ignition, and to form a hole in the vicinity of the hole in the case of automatic ignition, as the ignition means. To provide a pipe burner which can be used in combination with manual ignition and automatic ignition by providing a separate spark plug in the pipe, and can surely ignite a combustion device from a remote place.

It is also an object of the present invention to improve workability in the case of manual ignition by moving the ignition means away from the high-temperature location of a combustion device such as a furnace, and to improve workability in the case of automatic ignition using a spark plug, etc. To provide a pie mouth burner that can extend the life of the burner and improve workability and safety during operation of a combustion device.

Furthermore, it is an object of the invention that at least one
One flow channel is used as a flame conduit, gas in a combustion state and gas in an unburned state are flowed alternately, and the flame is discharged from the outlet of the flow channel into the main combustion pipe. By igniting flammable gas within the main combustion pipe and releasing the flame to the outside from the main combustion pipe, it is possible to reliably ignite the main burner or other combustion equipment. It can be made long, and by bending each flow path can be made into any curved shape, and the main burner can be ignited with any type of burner.
To provide a pie mouth burner that can be easily installed near a main burner.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing one embodiment of a pilot burner according to the present invention, and FIG. 2 is a cross-sectional view taken along the line A--A in FIG.

As shown in FIGS. 1 and 2, reference numeral 1 denotes a tubular flow path (hereinafter simply referred to as an inner tube), which allows combustible gas to flow from a mixing chamber 2 to a main combustion tube 3. As shown in FIGS.

Reference numeral 4 denotes a tubular flow path (hereinafter simply referred to as an outer tube) having a larger diameter than the inner tube 1, and is configured to flow flammable gas from the mixing chamber 2 to the flame conduit 3 in exactly the same way as the inner tube 1.

The main combustion pipe 3 has one end communicating with each outlet of the inner pipe 1 and the outer pipe 4 to concentrate the flammable gas, and the other end to release the flame to the outside. 4, and a flame retaining plate 5 is provided at one end.

Reference numeral 6 denotes a casing, to which one ends of the inner tube 1 and the outer tube 4 are connected, each inlet is formed inside, and a part of the mixing chamber 2 is also formed.

Further, an ignition plug 7 is attached to the casing 6 and has a part thereof protruding inside one end of the outer tube 4.
An ignition port hole 8 is formed in the casing 6 near the casing 6 and penetrates through the inner side of one end of the outer tube 4.

Further, nozzles 9 and 10 are formed at the inlets of the inner tube 1 and the outer tube 4 to set the divided flow rate of the combustible gas.

A mixing chamber 2 is provided adjacent to the casing 6, in which combustion gas and air are taken in through supply ports 11 and 12, respectively, to mix and produce flammable gas.

A viewing window 13 is attached to this mixing chamber 2, and the mixing chamber 2
The inside of the building can be inspected as needed.

Next, the operation of the present invention will be described.

First, combustion gas and air are flowed into the mixing chamber 2 from the respective supply ports 11 and 12 at a sufficiently high speed.The combustion gas and air are mixed to a combustible state in the mixing chamber 2, and the casing 6 It flows out toward the inlets of the inner tube 1 and outer tube 4.

When this flammable gas flows out, by setting the sizes of the nozzles 9 and 10 in advance, the flow rates of the combustible gas flowing into the inner tube 1 and the outer tube 4 can be adjusted as appropriate. .

In addition, the flammable gas flows through the inner pipe 1 and the outer pipe 4 at a speed sufficiently faster than the maximum combustion speed of the combustible gas itself, ejects into the main combustion pipe 3, and finally flows outside. leak.

Next, the flammable gas inside the outer tube 4 is ignited.

When this ignition is performed manually, a spark is inserted into the ignition port hole 8 using a torch burner or the like.

At this time, the flammable gas near the inlet in the outer tube 4 ignites, and a flame is generated by combustion.

However, the flow velocity v1 of the flammable gas and combustion gas in the outer tube 4
Since the combustion velocity is much greater than the maximum combustion velocity of the combustible gas, the flame is transported along with the combustible gas through the outer pipe 4 and discharged into the main combustion pipe 3.

Note that the rear part of the nozzle 10 of the outer tube 4 needs to have a shape that does not have an extreme cross-sectional change so as not to act as a flame holder.

Further, the insertion of the spark may be carried out for a short time, and the time is appropriately determined depending on the length of the outer tube 4 and the flow rate of the combustible gas, etc. within the outer tube 4.

When igniting automatically, connect shield wire 1 to spark plug 7.
A current of a predetermined period is supplied from a device (not shown) via 4.

At this time, a spark is generated in the ignition plug 7, igniting the flammable gas near the inlet in the outer tube 4, and generating a flame by combustion.

Therefore, the flame is transferred along with the combustible gas through the outer tube 4 and discharged into the main combustion tube 3, just as in the case of the manual operation described above.

Incidentally, the operating period of the spark plug 7 may be short, and the period is appropriately determined depending on the length of the outer tube 4 and the flow rate of combustible gas, etc. in the outer tube 4, just as in the case of manual operation. .

Further, even in the automatic case, the ignition operation may be performed only once as in the manual case.

In this case, the flow path between the inner tube 1 and the outer tube 4 serves as a flame conduit.

The flame released into the main combustion pipe 3 ignites the combustible gas flowing out from the inner pipe 1 and the combustible gas flowing out after the flame in the outer pipe 4.

That is, since the diameter of the main combustion pipe 3 is larger than the diameter of the outer pipe 4, the flow velocity of combustible gas, etc. in the main combustion pipe 3 is slower than that in the inner pipe 1 and the outer pipe 4, and therefore the combustible gas etc. The gas fills the main combustion pipe 3, and the flame remains within the main combustion pipe 3 without being blown off, and the flame stably burns the combustible gas within the main combustion pipe 3.

As a result, a main flame is generated within the main combustion pipe 3, and the flame is held by the flame holding plate 5 and stably exits to the outside of the main combustion pipe 3.

In this case, the inner tube 1 also has a
By attaching the flame holding plate 15, the main flame can be held more effectively.

In addition, in this case, since the flow velocities V1 and v2 of the flammable gas in the inner pipe 1 and the outer pipe 4 are both adjusted to be sufficiently larger than the maximum combustion velocity of the combustible gas, There is no backfire into the inner tube 1 and outer tube 4.

A portion of the flame exiting from the main combustion pipe 3 acts to ignite a main burner or other combustion device (not shown).

The ignition of this combustion device is not directly ignited manually or automatically, but indirectly via the outer tube 4 and the flame transferred inside it, so it is ignited at a location away from the combustion device. It can actually ignite a combustion device.

Incidentally, the respective branched flow rates of the inner tube 1 and the outer tube 4 in the above embodiment are adjusted by the respective nozzles 9 and 10 according to the discrete volumes and lengths of the inner tube 1 and the outer tube 4.

Further, in place of the spark plug 7 in the above embodiment, a heating wire may be used in the present invention.

Further, it is desirable that the manual ignition port hole 8 in the above embodiment be located immediately after the nozzle 10 where the static pressure is lower.

This is because if the static pressure is too high, the speed of the gas blown out from the holes 8 will be too fast and the interior will not ignite.

Further, it is effective that the hole 8 has a shape that expands outward.

Furthermore, if the outer tube 4 and the inner tube 1 in the above embodiments are made of a material having a small cross-sectional area, it is convenient because the flow velocity of the gas in the outer tube 4 and the inner tube 1 can be easily increased.

Moreover, even if the outer tube 4 and the inner tube 1 are bent appropriately, there is almost no effect on their flame release function, etc., which is convenient for piping.

Further, in the embodiment described above, the inner tube 1 and the outer tube 4 have been described as the flow path, but it may be a single tube divided into two parts, or it may be two independent tubes.

Further, in the above embodiment, the case where the outer tube 4 is provided with the ignition means has been described, but in the present invention, the inner tube 1 may be provided with the ignition means.

As explained above, according to the present invention, there are at least two channels through which combustible gas flows simultaneously, an ignition means provided at the inflow end of at least one of these channels, and each flow channel. It consists of a main combustion pipe, one end of which communicates with the outlet of the channel to concentrate the flammable gas, and the other end of which directs the flame to the outside. At that time, by igniting the combustible gas in at least one flow path by the ignition means, the flame accompanying the combustion of the gas is transferred to the main combustion pipe, and the combustible gas in the main combustion pipe is ignited, A portion of the flame at that time comes out to the outside of the main combustion pipe, and the combustion device can be reliably ignited from a distance.Furthermore, according to the present invention, as an ignition means, ignition is performed on the wall of the flow path. By forming the mouthpiece L and separately providing a spark plug near the hole, it is possible to use both manual ignition and automatic ignition, and it can be used in a wide range of applications.

Further, according to the present invention, by flowing the flame and combustible gas together in at least one flow path and releasing the flame and combustible gas into the main combustion pipe from the flow path, a large amount of heat is generated in the main combustion pipe. A flame is generated and released, ensuring ignition of the main combustion pipe located far away, and more reliable ignition of combustion equipment located further away from the main combustion pipe. It is something.

Furthermore, according to the present invention, by moving the ignition means away from the high-heat location of a combustion device such as a furnace, workability and safety are improved in the case of manual ignition, and in the case of automatic ignition with a spark plug etc. This extends the life of shielded wires, etc., and simultaneously improves workability and safety during operation of the combustion device.

Furthermore, according to the present invention, each flow path is made thin and long,
By further bending, each flow path becomes an arbitrary curved shape, and it can be easily installed near the main burner of any type of burner, and it can be reliably ignited from a distance. Demonstrates excellent features.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a pie mouth burner according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. In the figure, 1 and 4 are flow paths, 3 is a main combustion pipe, and 7 and 8 are ignition means.

Claims (1)

[Scope of Claims] 1. At least two or more channels through which combustible gas flows simultaneously, at least one of these channels is a flame conduit, and ignition means provided at the inflow end of each channel, and each Consisting of a main combustion pipe, one end of which communicates with the outlet of the channel to concentrate the flammable gas, and the other end to direct the flame to the outside, the combustible gas is transferred to each channel at a rate higher than the maximum combustion speed of that gas. flammable gas in at least one channel is ignited by an ignition means, the flame accompanying combustion of the gas is transferred to the main combustion pipe, and other channels are not ignited by the transferred flame; The combustible gas released from the main combustion pipe is ignited for stable combustion, and the flame is emitted from the main combustion pipe to the outside.
A pilot burner characterized by being able to reliably ignite a combustion device from a remote location. 2. In the pie tip burner according to claim 1, the ignition means includes a hole for an ignition port formed in the wall of the flow path, and a separate ignition plug provided near the hole. A pie mouth burner characterized by: