JPS6082711A - Infrared ray burner - Google Patents

Abstract

PURPOSE:To ensure a high heating-to-red hot state temperature for a long time, by a method wherein a number of burner ports, extending through a burner plate, are formed in the entire surface of a burner plate made of mainly heat- resistant ceramic. CONSTITUTION:Gas, injected through a nozzle 16, is injected in a mixing pipe 17, and is sufficiently mixed with a primary air in a mixing chamber 18. The air- fuel mixture flows through burner ports 10 and 13 formed in a burner plate 7 made of mainly heat resistant cermic, is burnt on the surface of injection nozzles 11 and 14, and heats a projection 8 in a concentrated manner. In which case, flow-in holes 12 and 15 are sized to be larger than those of the injection nozzles 11 and 14 of the burner ports 10 and 13. This, when cotton dust floating in a chamber is sucked in the mixing chamber 18 and is adhered to the back of the plate 7, causes decreasing of the velocity of low at the flow-in part and therefore, permits prevention of closing up of the flow-in hole resulting from intrusion of the cotton dust. This prevents deterioration in heating-to-red hot state of the plate surface as a result of a decrease in an amount of a primary air and worsening of combustion due to the generation of carbon monoxide, resulting in the possibility to maintain heating-to-red hot state of the plate for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an infrared burner, particularly a burner plate, mainly made of ceramic dandruff used in a gas combustor.

2.-1. Structure of the conventional example and its problems As shown in FIGS. 1 and 2, this type of conventional infrared burner has a plurality of Vs on the surface of the burner plate 1 that intersect with each other in the horizontal and vertical directions. There is a configuration in which a groove is formed on the entire protrusion 2, and a plurality of flame holes are provided at the bottom of the outer periphery of the protrusion 2. 131
The gas ejected from the nozzles 1 and 2 is ejected into the mixing tube 4 and reaches the mixing chamber 5. It burns on the surface (near the outlet) of the flame hole 6 of the burner plate 1, causing mainly the protrusion 2 to become red hot.

In this configuration, the inner diameter of the flame hole 6 is single-diameter (straight), and the flame hole is designed to completely prevent backfire into the mixing chamber 4 for gases with extremely high combustion speeds such as city gas. The burner plate has a small internal diameter of 1.0ff1711, and the burner plate has a total thickness of 12 to 13M in order to maintain the mechanical strength of the burner plate, resulting in the following drawbacks.

(I) When the device is in use, floating debris in the room may fall into the nozzle 3.
is attracted by the primary air flow near the , enters the mixing chamber 5 and adheres to the back surface of the diburner plate 1 .

At this time, the flow velocity at the inflow part of the flame hole 6 may be high.
7. Because the inlet of the flame hole 6 was covered and blocked by debris, combustion was stimulated due to lack of air, the red heat of the plate surface decreased, and -
This causes deterioration in combustion, such as the generation of carbon oxide, and poses a problem in terms of equipment durability.

(II) Because the flow path resistance of the air-fuel mixture in the flame holes 6 provided on the entire surface of the burner plate 1 is large, the amount of primary air attracted from the vicinity of the nozzle 3 decreases, resulting in air-deficient combustion, which lowers the red-hot temperature on the plate surface and increases the temperature. It had all the drawbacks of not being able to obtain radiation efficiency. In order to achieve this air-starved combustion, the mixing tube must be made larger, the nozzle diameter must be made smaller, and the gas pressure must be set at a higher total pressure.

Furthermore, since the plurality of flame holes 6 are provided only at the bottom of the outer periphery of the protrusion 2, the peripheral slope of the protrusion 2 is only indirectly heated, resulting in low red-hot temperature and high radiation efficiency. I can't do it. Also, flame hole 6 on protrusion 2? However, since the flow path length is longer than the flame hole 6 provided at the bottom of the outer periphery of the protrusion 2, the amount of gas ejected is reduced, and the protrusion 2 cannot be heated effectively, resulting in a decrease in red-hot temperature. there were.

In addition, there are known general infrared burners such as a Schpank burner plate in which all the flame holes are arranged in a ceramic plate, and a metallic burner in which combustion gas is burned on the surface of metal gold and steel. Nyupasikupana plates have the disadvantage that they tend to crack due to heating and cooling of the plates, which can lead to short lifespans. I keep it short. Since the heat conductivity of the reed ceramic plate itself is relatively high, if the combustion surface temperature reaches 1 (900'C) or higher, the temperature on the back of the plate, especially near the flame hole, will rise and the mixture will ignite, causing a risk of backfire. Therefore, from the perspective of radiation efficiency, a combustion surface fFA degree of 900°C or higher is desired, but from the viewpoint of the life of the ceramic plate and the safety of the burner, the combustion surface temperature is set at 900°. Currently, the temperature is kept below C. Metallic burners have characteristics such as a short rise time from ignition to red-hot temperature and easy processing, but they have low corrosion resistance at high temperatures. Therefore, it is practically impossible to expect a large radiation efficiency by increasing the width of the combustion surface.
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Purpose of the Invention The present invention solves all the problems of the conventional technology that requires 1 m.It ensures a high incandescent temperature for a long period of time, promotes the rise of incandescent heat, obtains a high combustion surface degree, and has a high radiation efficiency and a high speed. The overall purpose is to provide an infrared burner system with thermal effect.

Structure of the Invention The present invention provides a plurality of protrusions on the surface of the burner plate, the flame hole is completely submerged at the bottom of the outer periphery and approximately the center of the protrusion, the diameter of the inflow hole is larger than the diameter of the ejection hole of the flame hole, and the ejection hole Side channel length? are assumed to be the same, and the flow path resistance of each flame hole is made uniform.

This configuration prevents dust from clogging the flame hole (inflow hole) on the back of the plate! In addition to maintaining a high red-hot temperature for a long period of time by preventing heat generation, it also promotes the supply of primary air by reducing and equalizing the flow path resistance of the flame hole to achieve an appropriate excess air ratio (m value). At the same time, by accelerating the heating of the protrusion, a high combustion surface temperature can be obtained, and a high-radiation infrared burner can be obtained.

66-1. Description of Embodiment Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 3 and 4. 3 and 4), and 7 is alumina Al2O
3% and silica 5i02'(i) as the main material, 8 is a plurality of quadrangular pyramid-shaped protrusions provided on the surface of the burner plate 70, and a plurality of V crosses each other in the horizontal and vertical directions.
It is composed of a groove, and a flat part 9 is formed at the upper end. 10
A plurality of flame holes A are provided at the bottom of the outer periphery of the protrusion 8, which communicates with the upper jet hole A11 and fully opens the inlet hole AI2 downward, and the inner diameter of the inlet hole A12 is larger than that of the jet hole A11. Reference numeral 13 denotes a flame hole B provided approximately in the center of the protrusion 8, and similarly to the flame hole A described above, the ejection hole B14 and the inlet hole B15 are all provided. Nozzle hole A11. B14 is a small hole with an inner diameter of φ1.0 to φ1.1 in order to improve flashback resistance against gas with a high combustion rate, and inlet hole A12. The inner diameter of B15 is small! 7. The jet hole A11. The length of the hole B14 is the same in order to equalize the flow path resistance. 16 is a nozzle, 17 is a mixing pipe,
18 is mixed 77. , chamber 19 is the filling side.

In the configuration described above, the gas ejected from the nozzle 16 is ejected into the mixing pipe 17, and after being sufficiently mixed with the primary air in the mixing chamber 18, the air-fuel mixture flows through the flame holes A of the burner plates 1 and 7.
10. It passes through B13 and is completely combusted on the surface of the nozzle holes A11 and B14 (near the exit). At this time, the supply of secondary air on the upper surface of the plate also causes complete combustion, and the plate surface, especially the protrusion 8, is intensively heated.

In the present invention, by making the total diameter of the inlet hole larger than the blowout hole of the flame hole, the opening area of the inlet hole is Since the flow rate is large and the flow velocity at the inlet hole is slow, it is possible to completely prevent cotton dust from biting into the flame hole flow hole and completely clogging the inlet hole, which was the case in the past. This prevents a decrease in red heat on the plate surface and deterioration of combustion due to the generation of -carbon oxide, making it possible to maintain stable red heat of the plate over a long period of time.

σ et al., the air-fuel mixture jet hole A11 with the largest flow path resistance,
By making the flow path length and hole length of No. 814 the same, and equalizing the flow path resistance of the flame hole of each blow hole, B
Since the jetting speed of the air-fuel mixture from 14 is kept constant, lift can be prevented and stable flame stability can be ensured near the outlet of the jetting hole. As a result, the peripheral inclined part and the flat part 9 of the protrusion 8 are effectively heated to red-hot color, and high radiation can be obtained.

The burner plate of the present invention is formed into a plate shape using a ceramic structure that is a composite of heat-resistant ceramic fibers mainly composed of alumina Al2O3 and silica 5i02', and has a thermal conductivity of 0 to 1 ktA/m-h. As the plate is smaller than °C, the air-fuel mixture nozzle A1 in the entire plate area
1. Since the inner diameter of B14 is as small as φ1.0 to φ1.14fl, the surface temperature is 950℃.
What is the temperature on the back of the plate even when it is kept at a high range of °C to 1050 °C? Low width degree (100~200'C)
It can be kept in place and backfire can be completely prevented. Furthermore, the flow path length (hole length) of the ejection hole All and the ejection hole B14 is Y
The flow path resistance of the flame holes A10 and B13 is equalized by making them the same length and making the flow path long (5 to 6 ms +) that can fully guarantee flashback resistance. and reduction can be achieved.

As a result, the air-fuel mixture jetting speed of the flame hole becomes constant over the entire plate area, ensuring uniform and stable flame stability, and evening out the red-hot temperature. Furthermore, by reducing the flow path resistance of the flame hole, a sufficient amount of primary air can be sucked in from the vicinity of the nozzle 16, resulting in an excess air ratio (m value of 1.0 to 1.1) suitable for plate burners. can be set,
The heating of the plate surface is promoted by improving the combustion efficiency on the plate surface, resulting in a high red-hot temperature (950-1050°C).
)k, and an infrared burner with high radiation efficiency can be obtained.

At the same time, with the increase in the intake amount of secondary air, the mixing pipe 1
7 and the mixing chamber 18 are made smaller, and the burner can be made more compact.

As described in detail, the invention is to provide a burner plate made entirely of heat-resistant ceramic, with a large number of flame holes penetrating the entire surface of the burner plate from the front to the back, and to make the inflow hole diameter larger than the outlet hole diameter of the flame hole. So 10 be.

(1) This prevents dust clogging of the flame hole on the back of the burner plate and ensures a stable high red-hot temperature for long-term use.

(2) Increase in total surface temperature of burner plate (950~1
050'C) and equalization? As a result, an infrared burner with excellent heating speed and high radiation efficiency can be provided.

(3) It is possible to provide an infrared burner that completely prevents backfire and lift and can handle reburned gases with different properties.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the entire conventional infrared burner, Figure 2 a,
b is a sectional view and a plan view of the same essential parts, FIG. 31 is a sectional view showing an embodiment of the infrared wire burner of the present invention, and FIGS.
FIG. 2 is a cross-sectional view and a plan view of the main part. 7...Burner plate, 8...Protrusion,
10...Flame hole A, 11...Blowout hole A,
12... Inflow hole A, 13... Flame hole B, 1
4...Blowout hole B, 15...Inlet B0 Name of agent Patent attorney Toshi Nakao and 1 other person No.1
Figure (Illusion (b) Figure 3 Figure 4 Otsu Do l

Claims (3)

[Claims] (1) An infrared burner that is made entirely of heat-resistant ceramic and has a large number of flame holes penetrating the entire surface of the burner plate from the front and back, and the diameter of the inlet hole is larger than the diameter of the outlet hole of the flame hole. (2) A claim in which a plurality of protrusions are provided on the surface of the burner plate, and a plurality of flame holes are provided at the bottom of the outer periphery of the protrusions, and all flame holes are provided approximately in the center of the protrusions. The infrared burner according to item 1. (3) The infrared burner according to claim 2, wherein the length of the flow path on the ejection port side of the flame hole is the same, and the flow path resistance of each flame hole is made completely uniform.