JPH0627570B2 - High load combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a high-load combustion device, and more particularly to a high-load combustion device of a type that forcibly supplies combustion air to a combustion chamber. The combustion load of the main combustion flame portion can be increased by improving the combustion stability of sleeve fires provided subsequent to the combustion flame portion, and the amount of combustion as a whole is increased.

[Prior art and its problems] As a high-load combustion apparatus, a premix type combustion apparatus is widely used as a combustion apparatus for water heaters and heaters. As a combustion apparatus of this type, it is described in Japanese Utility Model Publication No. 60-95422. Have been proposed. This conventional one has the structure shown in FIG. 4, and a premixing chamber (2) is connected to the upstream side of a ceramic plate (1) having a large number of flame holes (10) (10) penetratingly arranged. do it,
A dispersion plate (20) having a large number of openings (21) (21) formed at a constant pitch is disposed between the plate (1) and the plate (1).

In this conventional type, a mixture of combustion gas and air is introduced into the premixing chamber (2), which causes the flame of the plate (1) from the dispersion plate (20) having the openings (21) (21). It is distributed and supplied to the holes (10) (10) and burns at the exit side of these flame holes (10) (10). Since there is a certain gap between the end face of the plate (1) on the inlet side and the end of the openings (21) and (21), the opening (21)
The air-fuel mixture discharged from (21) is mainly discharged from the flame holes (10) (10) facing the opening (21) to the combustion surface side, and part of it reaches the outer peripheral region. Therefore, as shown in the figure, the flame formed on the combustion surface of the plate (1) has a main combustion flame part (31) that coincides with the openings (21) (21) and a small sleeve fire part ( 32)
Therefore, the sleeve fire portion (32) ensures the stability of combustion in the main combustion flame portion (31). That is, when the main combustion flame portion (31) tends to lift, the sleeve fire portion (32) functions to hold the flame of the main combustion flame portion (31) on the combustion surface side of the plate (1).

However, in this conventional one, since the combustion amount in the main combustion flame portion (31) formed on the combustion surface side of the plate (1) is large, the sleeve fire portion (32) (which surrounds the main combustion flame portion (32) ( There is a problem that air shortage to 32) easily occurs, and as a result, lifting etc. occurs and combustion stability becomes insufficient, and the overall combustion amount cannot be set to a sufficiently large value.

According to the present invention, in order to forcibly mix air and gas through the intermediate chamber on the upstream side of the plate (1) having the large number of flame holes (10) (10) arranged therethrough. With a premixing chamber (2)
A mixture of air and combustion gas discharged from a large number of openings (21) and (21) formed in the dispersion plate (20) which is a constituent wall of the premixing chamber (2) on the side of the intermediate space is formed into the intermediate space. The flame hole through the chamber
(10) In the high-load combustor, which is dispersedly supplied to (10) and the flat surface on the downstream side of the plate (1) is used as the combustion surface (1a),
In order to be able to set a large combustion load on the combustion surface (1a) in (1), the task is to ensure combustion stability in the sleeve fire part (32) and eliminate incomplete combustion in this part. To do.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is that "the opening (21) is formed around the openings (21) and (21) of the dispersion plate (20) in the intermediate empty space. An annular auxiliary air-fuel mixture chamber (22) that surrounds and is filled with the air-fuel mixture for sleeves is provided, and the auxiliary air-fuel mixture chamber (22) is surrounded by the partitioned air chamber (23).
(23) (23) was forced to supply air. '

[Operation] The above technical means of the present invention operates as follows.

The air-gas mixture supplied to the pre-mixing chamber (2) is discharged from the flame holes (10) (10) of the plate (1) through the intermediate chamber through the opening (21) as in the conventional case. Reach the burning surface (1a). Of these, a part of the flame holes (10) (1
It reaches the combustion surface (1a) directly from 0). The other part reaches the combustion surface (1a) from the flame holes (10) (10) in the outer peripheral region of the above range through the auxiliary mixing chamber (22) in the intermediate space. Now the burning surface (1
In a), a large number of main combustion flame portions (31) (31) are formed, and each main combustion flame portion (31) is surrounded by the sleeve fire portion (32). Since the air chamber (23) is located on the outer periphery of the auxiliary air-fuel mixture chamber (22), the fresh air supplied from this air chamber (23) is supplied to the outer peripheral portion of the sleeve heating part (32). Sufficient combustion air is supplied to the sleeve part (32).

Therefore, the stability of the sleeve ignition part (32) is ensured and incomplete combustion due to insufficient air is prevented.

[Effects] The present invention having the above-described configuration has the following unique effects.

Since the stability of the sleeve fire part (32) located on the outer periphery of the main combustion flame part (31) can be ensured and incomplete combustion due to lift sig can be prevented, a large amount of combustion in the main combustion flame part (31) can be set,
The combustion load of the entire combustion device can be increased.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The embodiment shown in the drawings is a combustor such as a heater. Combustion air is forcibly supplied to the upstream side of the plate (1) by an air supply device such as a fan.

This combustor, as shown in FIG. 1, has a large number of flame holes (10).
It consists of a plate (1) equipped with (10) and a premixing chamber (2) arranged on the upstream side, and the wall surface on the plate (1) side in this premixing chamber (2) is a dispersion plate (20). Function as. A constant gap is formed between the dispersion plate (20) and the upstream end surface of the plate (1), and this gap portion serves as an intermediate empty chamber and a part of it serves as an air chamber (23). The air chamber (23) is partitioned from the primary air chamber (24) on the upstream side.

An air circuit from a fan (F) is connected to the air chamber (23) and the primary air chamber (24), and the air from the fan (F) is supplied at a predetermined distribution ratio.

As shown in FIG. 1, a large number of openings (21) (21) formed in the dispersion plate (20) are cylindrical portions, and a taper that spreads toward the plate (1) side in this cylindrical portion. The tube (T) is externally fitted, and the downstream end of the tapered tube (T) is in contact with the upstream end surface of the plate (1). Therefore, the taper tube (T) and the dispersion plate (20)
The empty room surrounded by and becomes the air room (23).

The opening (21) and the tapered tube (T) are arranged concentrically,
The flame hole unit composed of these is a plate (1)
Are arranged in a staggered pattern on the plane. Therefore, in the burner configured as described above, the combustion surface (1a) of the plate (1) has the main combustion flame portion (31) at the center as shown in FIG. Further, the flame hole units, which are surrounded by, and whose outer periphery is the air layer portion (33), are arranged in a staggered pattern at regular intervals.

In the above-mentioned configuration, as in the conventional example described above, as shown in FIGS. 2 and 3, the sleeve flame portion (3) is formed on the outer periphery of the main combustion flame portion (31).
2) is formed, which secures the combustion stability of the main combustion flame portion (31). Moreover, the air supplied through the air chamber (23) is supplied to the sleeve fire (32) by the air layer portion (3
It will be supplied from 3) and will act as described above.

In this embodiment, in the primary air chamber (24), the premix chamber
The throat (25) is projected from the wall surface on the upstream side of (2) and is opposed to the nozzle (N) for gas supply, and the primary air chamber (24)
The air supplied to the nozzle is supplied into the premixing chamber (2) together with the gas supplied from the nozzle (N) and mixed therein.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a plate (1).
Fig. 3 is a front view of the combustion surface (1a) of Fig. 3, Fig. 3 is an enlarged view of the relationship between the main combustion flame part (31) and sleeve fire part (32), and Fig. 4 is an explanatory view of a conventional example. 10) …… Flame hole (1) …… Plate (2) …… Premix chamber (20) …… Dispersion plate (21) …… Opening (1a) …… Combustion surface (22) …… Auxiliary mixture chamber ( 23) ... air chamber

Claims (1)

[Claims] 1. A premixing chamber (2) for forcibly mixing air and gas through an intermediate empty chamber upstream of a plate (1) having a large number of flame holes (10) (10) penetratingly arranged therein. ) Is provided in this premixing chamber (2)
The air-fuel mixture from a large number of openings (21) (21) formed in the dispersion plate (20) which is a constituent wall of the intermediate chamber side of the flame hole (10) through the intermediate chamber. In the high load combustion device, which is distributed and supplied to (10), and the plane on the downstream side of the plate (1) is the combustion surface (1a), the opening (21) of the dispersion plate (20) in the intermediate chamber
An annular auxiliary air-fuel mixture chamber (22) surrounding the opening (21) and filled with the air-fuel mixture for sleeve and fire is provided on the outer periphery of (21), and the auxiliary air-fuel mixture chamber (22) is partitioned from this. A high load combustion apparatus which is surrounded by an air chamber (23) and forcibly supplies air to the air chambers (23) and (23).