JPH109516A - Premixing gas burner of flat flame type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a premixing gas burner of flat flame type free from back fire. SOLUTION: A punching metal 3 having a large number of vent holes 3A is provided on the inner surface side of a combustion plate 1 in which a large number of leading holes 1A are opened with a distance of 2-50mm, a sensor 4 capable of detecting the temperature or pressure is interposed between the combustion plate 1 and the punching metal 3, and the sensor 4 is connected to a controller 5, and the controller 5 is connected to a control valve 6 and a safety device operation indicator 7 as a fuel shut-off device in a communicable manner. When the sensor 4 detects the temperature exceeding the prescribed value (e.g. 80-200 deg.C), or the pressure increase exceeding the prescribed value (e.g. 50kPa), the control valve 6 is closed to urgently stop the feed of the combustion gas to a mixed gas chamber 2, and the safety device operation indicator 7 is operated to alarm that the control valve 6 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original mixing type planar flame burner.

[0002]

2. Description of the Related Art As an original mixing type planar flame type burner,
For example, an original mixing type planar flame type burner 100B having the structure shown in FIG. 2 is known. In FIG. 2, a portion indicated by a bold line is a thick portion of a component member, which is generally a portion formed of a heat-resistant metal material, for example, a stainless steel plate, and a hatched portion allows a mixed gas to pass therethrough. Section of the combustion plate 1 having a large number of guide holes 1A.

That is, in this burner, a mixed gas G1 of a fuel gas and air containing an amount of oxygen necessary for combustion of the fuel gas is supplied to a mixed gas chamber 2 on the back side of the combustion plate 1. It is designed to pass through a large number of conducting holes 1A and to form and burn a flame G2 distributed in a plane on an outer combustion surface 1B.

[0004] The combustion plate 1 in this case is formed mainly of a thick plate-like refractory material, for example, ceramic fiber or the like, provided with a number of fine conductive holes 1A as shown in the figure.

[0005] surface-flame burner having the above structure, since faster completion of combustion in comparison with the single nozzle type burner previously mixing type, can be reduced generation amount of NO _X, a compact apparatus because a flame G2 does not increase It has been used as a heating device for a high-temperature regenerator in an absorption refrigerator.

[0006]

However, in the above-described original mixing type planar flame type burner, if the guide hole 1A becomes too large due to the aging of the combustion plate 1, the flame reaches the mixed gas chamber 2. When entering, the entire mixed gas in the mixed gas chamber burns at once, a so-called explosion occurs and it is dangerous,
It was necessary to prevent a flashback, and solving this point was an issue.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is provided with a fuel gas and air containing an amount of oxygen necessary for combustion of the fuel gas. And a multi-hole combustion plate which is provided facing the mixed gas chamber and through which the mixed gas supplied from the mixed gas chamber passes and forms a flame on the surface opposite to the mixed gas chamber. In the original mixing type planar flame type burner equipped,

An original mixing type flat flame type burner according to a first configuration, in which a multi-hole plate member formed so as to allow a mixed gas to pass therethrough is installed close to the combustion plate from the side of the mixed gas chamber;

[0009] In the original mixing type planar flame type burner of the first configuration, the gap between the combustion plate and the plate-shaped multi-hole member is 2-5.
An original mixing planar flame type burner of the second configuration, which is set to 0 mm,

[0010] In the original mixing type planar flame type burner of the first or second configuration, a sensor capable of detecting temperature or pressure is provided between the combustion plate and the plate-shaped multi-hole member. An original mixing planar flame type burner of the third configuration,

In the third aspect of the present invention, the supply of fuel gas to the mixed gas chamber is stopped when the sensor detects a predetermined temperature or a temperature exceeding a predetermined pressure. An original mixing planar flame type burner having a fourth configuration in which a fuel cut-off device is installed;

In the fourth aspect of the present invention, when the fuel cutoff device stops supplying the fuel gas based on the information output from the sensor, the safety of the operation of the fuel cutoff device is displayed. A fifth aspect of the present invention is to solve the above-mentioned problems of the related art by providing a fifth embodiment of the present invention, in which an apparatus operation indicator is provided and an original mixing type planar flame type burner.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. Note that, in order to facilitate understanding, in FIG. 1 also, portions having the same functions as the portions described in FIG. 2 are denoted by the same reference numerals.

In the original mixing type flat flame type burner 100 having the structure shown in FIG. 1, a punching metal 3 having a large number of ventilation holes 3A is provided on the inner surface side of the combustion plate 1, and the combustion plate 1 A sensor 4 capable of detecting temperature or pressure is interposed between the punching metal 3 and the punching metal 3.

The sensor 4 and the controller 5, and
The controller 5 is communicably connected to the on-off valve 6 as a fuel cutoff device and the safety device operation indicator 7 so that the sensor 4 detects a temperature exceeding a predetermined temperature (for example, 80 to 200 ° C.) When a pressure rise exceeding a predetermined pressure (for example, 50 kPa) is detected, the on-off valve 6 is closed to urgently stop the supply of the mixed gas G1 to the mixed gas chamber 2 and activate the safety device operation indicator 7. The opening and closing valve 6 is configured to notify that it has operated.

The punching metal 3 has, for example, a diameter of 3 to
About 10mm ventilation hole 3A is 40-400 / 100c
A heat-resistant stainless steel plate or the like having a density of about m ² is arranged by stacking, for example, two to five sheets so as to increase the heat capacity while slightly shifting the positions of the ventilation holes 3A.

By installing the punching metal 3, even if the flame G 2 enters the back side of the combustion plate 1 due to, for example, the introduction hole 1 A of the combustion plate 1 becoming larger, the mixed gas G 1 Before igniting and exploding, the heat of the flame is rapidly lost by the punching metal 3 having a large heat capacity and good thermal conductivity, and the fire can be extinguished, so that there is no danger of explosion.

When a small amount of the mixed gas G1 between the combustion plate 1 and the punching metal 3 is explosively burned by the flame G2 entering the back surface of the combustion plate 1,
This phenomenon is detected by the sensor 4.

That is, the combustion plate 1 and the punching metal 3
When a small amount of the mixed gas G1 in the explosion burns explosively, the temperature and the pressure rise rapidly, and are detected by the sensor 4. The on-off valve 6 is operated based on the information output from the sensor 4, the supply of the mixed gas G 1 to the mixed gas chamber 2 is stopped, and the operation of the on-off valve 6 is indicated by a safety device operation indicator 7. Is displayed.

Therefore, it is possible not only to prevent ignition and explosion of the mixed gas G1 in the wide mixed gas chamber 2 but also to repair the damaged combustion plate 1.

In place of the punching metal 3, 1
The same fire extinguishing action as that of the punched metal 3 can be obtained even when about 4 to 5 wire meshes of about 00 mesh are arranged one on another.

Further, instead of the punching metal 3, a ceramic plate having multiple holes may be arranged. Ceramics have a lower thermal conductivity than metal, and therefore do not have a strong fire-extinguishing effect unlike a metal plate. However, a thicker plate enhances the fire-extinguishing effect.

Further, since the ceramic plate having a large number of ventilation holes 3A having a diameter of about 1 to 2 mm has a flame holding effect, even if the fire cannot be extinguished, the flame G2 does not enter the mixed gas chamber 2 and the surface of the ceramic plate has The flame is maintained.

Even when the flame is held by the ceramic plate provided inside the combustion plate 1 as described above, a small amount of the mixed gas G1 between the combustion plate 1 and the ceramic plate can be obtained.
Is detected by the sensor 4, the opening / closing valve 6 is operated based on the information output from the sensor 4, and the mixed gas G 1
Is stopped, the fire is extinguished, and the operation of the on-off valve 6 indicates that the safety device operation indicator 7
Displayed by

It is preferable that the plate-shaped multi-hole member such as the punching metal 3 is installed at a distance of about 2 to 50 mm from the combustion plate 1. That is, the separation distance is set to be equal to or larger than a dimension where a space for mounting the sensor 4 can be secured. on the other hand,
When the separation distance increases, not only does the device become larger, but also the amount of the mixed gas G1 between the plate-shaped multi-hole member and the combustion plate 1 increases. Becomes too large, and each part is damaged. Therefore, the plate-shaped multi-hole member such as the punching metal 3 and the combustion plate 1
Is usually set at a distance of about 2 to 50 mm.

The ceramic plate forming the plate-shaped multi-hole member attached to the inside of the combustion plate 1 includes Al ₂ O ₃ ,
Powders such as SiO ₂ , TiO ₂ , ZrO ₂ , and MgO can be used alone or by appropriately mixing them.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

For example, the on-off valve 6 for urgently stopping the combustion when an abnormality occurs may be provided in a passage (not shown) for only the fuel gas.

[0029]

As described above, according to the original mixing type flat flame type burner of the present invention, there is no danger of backfire and explosion. In particular, in the burners of claims 3 to 5,
If a small amount of mixed gas between the combustion plate and the plate-shaped multi-hole member is burned by flashback, it can be detected, and furthermore, the supply of fuel gas is urgently stopped to ensure safety, and the fuel supply Since it is known that the emergency stop has been performed, measures such as repair can be taken promptly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment.

FIG. 2 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion plate 1A Guide hole 1B Combustion surface 2 Mixed gas chamber 3 Perforated metal 3A Vent hole 4 Sensor 5 Control device 6 Open / close valve 7 Safety device operation indicator 11 Fuel gas 12 Air 100 Former mixed type planar flame burner

Claims (5)

[Claims] 1. A mixed gas chamber to which a fuel gas and air containing an amount of oxygen necessary for combustion of the fuel gas are supplied, and a mixed gas chamber provided facing the mixed gas chamber and supplied from the mixed gas chamber. Is an original mixing type planar flame type burner provided with a multi-hole combustion plate that forms a flame on the surface opposite to the mixed gas chamber through which the mixed gas passes, and is formed so that the mixed gas can pass therethrough. An original mixing type planar flame type burner characterized in that a plate-like member having a hole is installed near a combustion plate from a side of a mixed gas chamber. 2. The gap between the combustion plate and the plate-shaped multi-hole member is 2-5.
The original mixing type planar flame type burner according to claim 1, wherein the diameter is 0 mm. 3. The original mixed planar flame according to claim 1, wherein a sensor capable of detecting temperature or pressure is provided between the combustion plate and the plate-shaped multi-hole member. Type burner. 4. A fuel cut-off device for stopping supply of fuel gas to the mixed gas chamber when a sensor detects a temperature or a pressure exceeding a predetermined temperature or a predetermined pressure. Item 3. An original mixing type planar flame type burner according to item 3. 5. A safety device operation indicator for displaying the operation of the fuel shut-off device when the fuel cut-off device stops supplying the fuel gas based on the information output from the sensor. Item 6. An original mixing type planar flame type burner according to item 4.