JPH0223951Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a high-speed burner used for various purposes. Specifically, the present invention is a burner casing in which a main flame opening is formed, and a combustion tube having a shape that becomes larger toward one end. is arranged and installed internally so that its large-diameter opening faces the main flame port, and a gas nozzle is provided at the small-diameter opening of the combustion tube for spouting fuel gas in the direction of the cylinder axis of the combustion tube. The present invention relates to a high-speed burner in which the combustion tube is formed with a large number of dispersed holes for blowing combustion air from the outside to the inside.

[Conventional technology]

Conventionally, in the above-mentioned high-speed burner, the third
As shown in the figure, both the pilot fuel gas supply passage 7 and the main flame fuel gas supply passage 10 are connected to the gas nozzle 4 disposed at the small-diameter opening of the combustion tube 3. Combustion air supply pipe 8
was inserted into the gas nozzle 4 so that its ejection opening was positioned concentrically with the small-diameter opening of the combustion tube 3 and faced the main flame port 1 of the burner casing 2. .

That is, the fuel gas ejected from the gas nozzle 4 and the combustion air ejected from the pilot combustion air supply pipe 8 are mixed in advance near the opening on the small diameter side inside the combustion tube 3, and then A pilot flame was formed near the opening and concentrically with it (I am unable to provide references).

In the figure, 6 is a large number of holes formed in the combustion tube 3 to blow combustion air for the main flame from the outside to the inside of the combustion tube 3, and 5 is a combustion air supply path for the main flame. be.

By the way, in the case of a general low-speed burner, a premixed pilot burner connected to each of a fuel gas supply passage and a combustion air supply passage is installed so as to penetrate the combustion cylinder from the outside to the inside. Although it is possible to
For high-speed burners that run at high speeds of about 120 m/s to 200 m/s, when a premixed pilot burner is placed through the combustion tube, the pilot burner protrudes into the combustion tube. Severe drifting occurs inside the combustion tube, making it impossible to form a good main flame.

Therefore, in high-speed burners, instead of being equipped with a pilot burner, a configuration is adopted in which the pilot combustion air supply pipe is inserted through the gas nozzle as described above, and the small-diameter opening inside the combustion cylinder is A pilot flame was formed by pre-mixing in the vicinity.

[Problem that the invention attempts to solve]

However, when the pilot flame is formed by pre-mixing in this way, the combustion air for the main flame, which is blown into the combustion tube at a considerable speed through the many holes formed in the combustion tube, is used for the pilot flame. This affects the mixing of combustion air and fuel gas, and as a result, there is a problem that the pilot flame becomes unstable and the ignitability of the burner is impaired.

In addition, since the pilot flame becomes unstable, it becomes impossible to greatly reduce the amount of fuel gas ejected from the gas nozzle, in other words, it becomes impossible to achieve a large turndown ratio as a burner.
This also led to problems with the burner's ease of use.

The purpose of this invention is to prevent the pilot burner from causing drift inside the combustion cylinder and to obtain a stable pilot flame by equipping the pilot burner with a rational arrangement. It is in.

[Means for solving problems]

The characteristic structure of the high-speed burner according to the present invention is that the large-diameter opening is arranged so as to face the main flame port of the burner casing, and a large number of holes are formed for blowing combustion air for the main flame into the combustion chamber. In a configuration in which a gas nozzle for ejecting fuel gas is provided at an opening on the small diameter side of the cylinder, a pilot burner connected to a fuel gas supply path and a combustion air supply path is connected so that its flame port is located on the small diameter side of the combustion cylinder. The gas nozzle is installed in the gas nozzle so as to be located approximately concentrically with the side opening and facing the main flame port, and its functions and effects are as follows.

[Effect]

In other words, since the pilot burner is installed inside the gas nozzle, the pilot burner is prevented from causing uneven flow inside the combustion cylinder.

In addition, since the pilot flame is formed in the pilot burner which connects the fuel gas supply path and the combustion air supply path, in other words, the pilot fuel gas and the pilot combustion air are mixed inside the pilot burner. Since the pilot flame is formed at the flame opening of the pilot burner, unlike conventional high-speed burners, the fuel gas jetted from the gas nozzle and the jetted combustion air jetted from the pilot combustion air supply pipe are transferred inside the combustion tube. Compared to the pre-mixing type where the pilot flame is formed by mixing near the opening on the small diameter side, the combustion air for the main flame is blown into the combustion tube at a considerably high speed through numerous holes formed in the combustion tube. , it is possible to effectively avoid adverse effects on the mixing of pilot fuel gas and pilot combustion air, and to ensure a stable pilot flame.

Moreover, by arranging the flame port of the pilot burner substantially concentrically with the small-diameter opening of the combustion tube, the pilot flame stabilized as described above can be applied uniformly in the circumferential direction of the combustion tube.

[Effect of idea]

As a result of the above, it is possible to form a good main flame because the drifting inside the combustion tube, which is the biggest concern for high-speed burners, is avoided. The ignitability of the burner can be greatly improved because it acts uniformly in the circumferential direction of the burner.Furthermore, the pilot flame can be stably maintained regardless of whether or not fuel gas for the main flame is ejected from the gas nozzle. It has become possible to have a large turndown ratio, and from these factors, it has become possible to create a high-speed burner that has excellent overall combustion performance and is extremely easy to use.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a cylindrical burner casing 2 with a main flame port 1 formed at its tip is equipped with a substantially conical combustion tube 3 as shown in FIG. 2, and connected to the combustion tube 3. In this state, a gas nozzle 4 for blowing fuel gas for the main flame into the combustion tube 3 is provided, and a combustion air supply path 5 for the main flame is connected to the rear of the burner casing 2. A large number of air holes 6 for blowing combustion air from the outside to the inside of the combustion tube 3 are formed in the combustion tube 3, distributed over the entire surface of its peripheral wall, and furthermore, a fuel gas supply path 7 for the pilot and a fuel gas supply path 7 for the pilot are provided. Combustion air supply path 8
A pilot burner 9 connected to the burner casing 2 is installed in the burner casing 2, thereby forming a high-speed burner.

10 in the figure is a fuel gas supply path for the main flame connected to the gas nozzle 4.

The cylindrical burner casing 2 is formed into a tapered shape, and the main flame port 1 formed at the tip thereof has a smaller diameter than the large-diameter side opening of the combustion tube 3.

The combustion tube 3 is arranged so that its large-diameter side opening faces the main flame port 1, and between the large-diameter side opening of the combustion tube 3 and the burner casing 2, combustion air for the main flame is provided. An annular air passage 11 is provided for blowing out a part of the combustion air supplied from the supply passage 5 into the burner casing 2 to the main flame port 1 side along the inner peripheral surface of the burner casing 2 for cooling purposes. It has been formed.

Note that the air ejected from the annular air passage 11 has a cooling effect and is then consumed as combustion air.

A large number of air holes 6 formed in the combustion tube 3 are formed in an inclined position such that the axis of each hole approaches the burner central axis P as the side toward the main flame port 1 approaches, and the combustion air is directed toward the burner central axis P. The flame is ejected toward the main flame port 1 while concentrating on the flame.

The main flame port 1, the combustion tube 3, and the gas nozzle 4 are arranged concentrically on the burner center axis P.
It is connected to the small-diameter side opening of the combustion tube 3 in such a manner that it becomes an ejection port.

In other words, from the gas nozzle 4, the fuel gas for the main flame is directed toward the burner center axis P (i.e., the cylinder axis of the combustion cylinder 3).
The main flame is ejected into the combustion tube 3 toward the main flame port 1 side, and together with the above-mentioned combustion air ejected from the numerous air holes 6, the main flame is ejected from the main flame port 1. is ejected in the direction of the burner central axis P at a high ejection speed of 120 m/s to 200 m/s.

An annular member 12 for flame stabilization is attached to the inner peripheral surface of the combustion tube 3, and flame stabilization is achieved by jetting combustion air from the numerous air holes 6 and jetting fuel gas for the main flame from the gas nozzle 4. By creating a negative pressure region near the side surface of the main flame port 1 of the annular member 12, lift of the main flame is suppressed.

In the figure, reference numeral 13 denotes an air conditioning plate, whose air conditioning action evenly disperses the combustion air supplied from the combustion air supply path 5 for the main flame to the numerous air holes 6 in the circumferential direction of the combustion tube 3. As a result, combustion air for the main flame can be uniformly blown into the combustion tube 3 from a large number of distributed air holes 6.

In other words, the main flame is stabilized by suppressing the lift by the flame stabilizing annular member 12 and by equalizing the jetting of combustion air by the baffle plate 13.

Note that, due to the action of the baffle plate 13, the cooling air ejected from the annular air passage 11 is also made uniform in the circumferential direction, so that the tip of the burner casing 2 is cooled well over its entire circumference.

The main body of the pilot burner 9 is formed into a cylindrical shape, and the flame port 9a of the pilot burner 9 is located near the small diameter opening of the combustion tube 3 and is directed toward the main flame port 1. A pilot burner 9 is installed inside the gas nozzle 4 so that the center axis of the cylindrical main body is located on the burner center axis P.

In other words, by arranging the pilot burner 9 concentrically with the gas nozzle 4, the main body of the pilot burner 9 does not become an obstacle to the flow of the mixture inside the combustion tube 3, thereby preventing the mixture inside the combustion tube 3. The airflow is made smooth without drifting, so that a good main flame can be formed.

With the arrangement of the pilot burner 9 as described above,
The pilot flame is located near the small-diameter opening inside the combustion tube 3, and at the center of the small-diameter opening (burner center axis P).
above). Further, the fuel gas ejection port 4a of the gas nozzle 4 has an annular shape located around the periphery of the flame port 9a of the pilot burner 9 and coaxially therewith.

Regarding the structure of the pilot burner 9, it has a bottomed cylindrical body 9A with one end serving as a flame port 9a.
The combustion air supply path 8 for the pilot is connected to the other end side, and the fuel gas injection pipe 14 connected to the fuel gas supply path 7 for the pilot is connected from the other end side inside the cylindrical body 9A. The fuel gas ejection pipe 14 extends toward the flame port 9a, and the tip of the fuel gas ejection pipe 14 is bent so that the ejection port at the tip faces the inner circumferential surface of the cylindrical main body 9A.

That is, by ejecting the fuel gas from the fuel gas ejection pipe 14 toward the inner peripheral surface of the cylindrical main body 9A,
The jetted fuel gas and the combustion air blown into the cylindrical body 9A from the pilot combustion air supply path 8 are transferred to the cylindrical body 9 before reaching the flame port 9a.
The mixture is sufficiently mixed inside A to form a stable pilot flame.

In the figure, 15 is an optical sensor that monitors the pilot flame.

[Another example]

Next, another embodiment of the present invention will be described.

A burner casing 2 forming a main flame port 1, a combustion tube 3 having a shape that becomes larger in diameter toward the main flame port 1, and
The specific shape and structure of the main flame gas nozzle 4 provided at the small-diameter opening of the combustion tube 3 can be modified in various ways.

Furthermore, the specific configuration of the combustion air supply path to the outside of the combustion tube 3 for blowing combustion air for the main flame into the interior of the combustion tube 3 through the numerous holes 6 formed in the combustion tube 3 may vary. Improvements are possible.

As the pilot burner 9 installed in the gas nozzle 4 for the main flame, various conventionally known types of pilot burners can be applied.
Various structural changes are possible as long as the arrangement is such that a faces the main flame port 1 and is located approximately concentrically with the small-diameter side opening of the combustion tube 3.

The specific connection structure of the pilot fuel gas supply path 7 and the pilot combustion air supply path 8 to the pilot burner 9 installed in the gas nozzle 4 can be improved in various ways.

The application of the high speed burner according to the present invention is not limited.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being an enlarged perspective view of a combustion tube. FIG. 3 is a longitudinal sectional view showing a conventional example. 1... Main burner port, 2... Burner casing, 3...
... Combustion tube, 4... Gas nozzle, 6... Hole, 7...
Fuel gas supply path, 8...Combustion air supply path, 9...
...Pilot burner.

Claims (1)

[Scope of utility model registration request] The burner casing 2 in which the main flame port 1 is formed is provided with a combustion tube 3 having a shape that becomes larger in diameter toward one end, and is disposed inside the burner casing 2 so that the large-diameter side opening faces the main flame port 1. A gas nozzle 4 for ejecting fuel gas in the direction of the cylinder axis of the combustion tube 3 is provided at the opening on the small diameter side of the combustion tube 3, and a large number of holes 6 are provided in the combustion tube 3 for blowing combustion air from the outside to the inside. A pilot burner 9, which is a high-speed burner formed in a dispersed manner and which connects a fuel gas supply passage 7 and a combustion air supply passage 8, is arranged so that its flame opening 9a is approximately the same as the small-diameter opening of the combustion tube 3. located concentrically, and
A high-speed burner is arranged to face the main flame port 1 and is installed inside the gas nozzle 4.