JPS605846B2 - combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to improve the indoor environment and improve health and hygiene, the present invention is directed to a combustor that does not emit exhaust gas indoors and uses a fan to take in the air necessary for combustion from outside.
This relates to a combustion device using a forced air supply/exhaust type combustor, and is particularly used in hot air machines, dryers, boilers, etc.

Fuels used in FF type combustors include petroleum,
There are liquid fuels such as gasified kerosene, fuels with poor diffusion such as LPG (butane or propane), fuels with slow combustion speeds such as natural gas, and fuels with high combustion speeds such as city gas.

Fuels with poor diffusion tend to cause the red flame phenomenon, fuels with a slow burning rate tend to cause the combustion flame to lift, and fuels with a fast burning rate tend to cause the flash pack phenomenon. have.
For this reason, conventional combustion devices are manufactured to have a structure adapted to the fuel used, and it is not possible to completely burn all of the various types of fuel as described above in one combustion device. Therefore, the shape of the combustion equipment differs depending on the type of fuel handled (particularly liquid fuel and gaseous fuel), which means that the number of production lines increases for the producer, and for the user, at least part of the combustion equipment changes when the fuel used changes. The disadvantage was that it had to be replaced with another one, which increased costs. In order to improve the above-mentioned drawbacks of conventional devices, the present invention is designed to completely combust all types of fuel, including fuels with poor diffusion, fuels with slow combustion speed, and fuels with high combustion speed, in one combustion device. The object is to obtain a combustion device, which includes a combustor frame, a burner having a mixing chamber and a flame port surface, a throttle section provided in the combustor frame, and this throttle section and the combustor frame. The burner has a combustion chamber formed by the burner, and the burner's burner face faces into the combustion chamber so as to face the opening of the throttle part, and a mixed gas is ejected from the flame port on the burner face and two gases are ejected into the combustion chamber. It is equipped with a means for supplying secondary air from both sides of the burner port surface and for arbitrarily adjusting the dimension from the burner port surface to the constriction part.

Hereinafter, one embodiment of the combustion apparatus of the present invention will be described with reference to FIGS. 1 to 3.

This embodiment is configured so that the combustor frame also serves as a heat exchanger. In the figure, 1 is a combustor frame (heat exchanger), 2 is a burner built into the combustor frame 1, and 3 is a burner. 2 is a mixing chamber for mixing combustion gas and primary air; 4 is a mixed gas baffle plate provided in mixing chamber 3; 5 is a flame of burner 2 having a flat part 5a and a flame port 5b in the center thereof; The mouth surface 6 is a boat part having a passage 6a for supplying the mixed gas in the mixing chamber 3 to the flame mouth surface 5, and the flame mouth surface 5 and the boat part 6 are formed in a line shape.
Further, a corrugated plate 7 is provided in the passage 6a of the boat portion 6 slightly below the flame outlet surface 5.

8 is provided in the combustor frame 1, and a sekiguchi 8 is provided in the center of the combustor frame 1.
A constriction section 9 having a diameter is a combustion chamber formed by this constriction section 8 and the combustor frame 1, and within this combustion chamber 9, the flame opening surface 5 of the burner 2 is opposed to the closing opening 8a of the constriction section 8. The mixed gas is blown out into the combustion chamber 9 from the flame port 5b of the flame port surface 5.

10 is a secondary air chamber into which secondary air is introduced from outside using a fan or the like; 11 is a recess formed in multiple stages on both sides of the combustor frame 1 near the bottom of the burner 2; and 12 is a combustion chamber in this recess 11. This is a support plate that is slid and inserted from the side of the burner frame 1 and supports the burner 2 in the vertical direction.This support plate 12 is provided with a large number of holes 12a, and the secondary air inside the secondary air chamber 10 is is rectified and sent to the combustion chamber 9.

Furthermore, by changing the insertion position of the support plate 12 into the recess 11, the dimension from the flame outlet surface 5 to the throttle part 8 can be arbitrarily adjusted. This rectifier plate 13 supports the boat part 6 with respect to the combustor frame 1, and further rectifies the secondary air rectified by the support plate 12, so that it flows into the combustion chamber 9 from both sides of the flame outlet surface 5. 14 is a burner support member that supports the burner 2 in the lateral direction; 15 is a combustion gas collection chamber formed above the throttle section 8 in the combustor frame 1; and 16 is a combustion gas collection chamber formed in the upper part of the combustion gas collection chamber 15. The provided inner fins 17 are outer fins provided on the outside of the combustor frame 1 to exchange heat with the outside air.

Note that the arrows shown in the figures indicate the direction in which the mixed gas, secondary air, or combustion gas flows. The optimum dimensions of each part in the combustion section of the embodiment described above will be explained with reference to FIG.

In the figure, a is the width of the flame opening 5b on the flame opening surface 5, b is the width of the entrance 8a of the constriction part 8, t is the thickness of the constriction part 8, and h' is the dimension from the flame mouth surface 5 to the constriction part 8. It is. i) In the case of fuel with poor diffusion (gasified liquid fuel, etc.) ■ If ami bSa + 3 skin a>b, the constricted part 8 acts in the same way as a baffle plate, and the constricted part 8 acts as a baffle plate, causing failure. Complete combustion occurs and CO
is more likely to occur.

Furthermore, if b is significantly larger than a, it will be the same as if there is no throttle part 8, and the secondary air will not work effectively against the mixed gas, causing red flame. In addition, in order to make the secondary air work effectively, it is desirable that the dimension a is 4 to 5 inches or less.

■ If the 3-piece StS2-piece storage t<3 ribs, the function as the aperture part 8 will not be sufficient.
As a result, mixing with secondary air becomes insufficient and red flames are more likely to occur.

Furthermore, when t is significantly larger than the length of the flame, heat is taken away from the flame to the throttle section 8, resulting in incomplete combustion.

■ If the 5th side ShSI 仇嬬 h<5, secondary air will seep in at the flame opening surface 5, making it impossible to form a stable flame.

Furthermore, if h>1, fuel with poor diffusion will not be sufficiently mixed with secondary air. By keeping h within the above range, the mixed gas and secondary air can be forcibly mixed and a stable flame can be formed. ii
) For other fuels (city gas, natural gas, etc.)■
a mi b mi a 13 yanagi a〉b is C as in i)
O becomes more likely to occur.

Furthermore, if b is significantly larger than a, the secondary air will not work effectively against the ramification gas. That is, the flat part 5a of the flame outlet surface 5
It is not possible to create a sufficient recirculation flow of secondary air above, resulting in poor flame retention and poor mixing of the gas mixture with the secondary air. (3) If the third side tS15 rib t<3 ribs, the function of the constriction portion 8 is insufficient, and therefore a sufficient recirculation flow cannot be formed by secondary air.

．． In addition, since the flame of a well-diffusing fuel is relatively short, if t>15, heat is taken away by the throttle section 8, resulting in incomplete combustion and CO is generated. (1) In a fuel with good diffusion of ShS2, even if the amount of primary air is small, it can be supplemented with secondary air, so the amount of secondary air supplied increases.

Therefore, if h<1, the secondary air will be trapped and a stable flame cannot be formed. Furthermore, if h>2, the effect of the throttle section 8 will be reduced, making it impossible to form a sufficient recirculation flow of secondary air. that's all,
Based on the explanations in i) and ii), the optimal dimensions of each part in the combustion section are as shown below.

■ b; a ten (0 to 3 items) ■ 3 side Mitomi 15 items ■ In the case of fuel with poor diffusion, in the case of 6 side mi hSI sideboard and other fuels, 1 x cape Sh mi 2 x proboscis like this In the combustion apparatus of the present invention, by arbitrarily adjusting the dimension h from the flame opening surface 5 to the constriction part 8 depending on the fuel to be handled, it is possible to completely burn all the fuels with one combustion apparatus.

The optimum dimensions of each part of the combustion section shown above were determined through experiments. Next, the operation of one embodiment of the device of the present invention described above will be explained.

First, the overall effect will be explained.

The primary air and fuel gas are mixed in a vaporizer (not shown) or the like to form a mixed gas, which is sent to the mixing chamber 3. In the mixing chamber 3, the mixed gas is further mixed and warmed, and is uniformly rectified by the mixed gas rectifying plate 4, passing through the passage 6a of the boat part 6, and flowing from the flame port 5b of the flame port surface 5 to the combustion chamber 9.
is ejected. On the other hand, the secondary air is first sent to the secondary air chamber 10, uniformly rectified through the holes 12a of the support plate 12, passes between the combustor frame 1 and the burner 2, and is further rectified by the rectifier plate 13. The flow follows the boat portion 6, flows into the combustion chamber 9 from both sides of the flame opening face 5, sandwiching the mixed gas, and mixes with the mixed gas. This mixed gas is ignited by an ignition heater (not shown) or the like to form a flame on the flame port surface. The corrugated plate 7 provided in the passage 6a of the boat section 6 serves to divide the mixed gas, increase the area of contact with the secondary air, and promote the mixing. Next, the effect will be explained for each fuel handled.

i) When handling fuel with poor diffusion such as gasified liquid fuel, by inserting the support plate 12 into the upper recess 11 of the recesses 11 formed in multiple stages on both sides of the combustor frame 1, The dimension h from the flame opening surface 5 to the constriction part 8 is 5
Adjust so that the skin level is within the range of hSI portside. By doing this, the secondary air is forcibly mixed with the mixed gas ejected from the flame port 5b on the flame port surface 5, so even fuel with poor diffusion can be sufficiently mixed with the secondary air. Therefore, even when handling fuel with poor diffusion, such as gasified liquid fuel, complete combustion can be achieved, and the amount of primary air can also be reduced. li) When handling fuels other than those explained in i), that is, fuels with good diffusion such as city gas and natural gas, as shown in FIG. Insert the support plate 12 into the lower recess 11, and determine that the dimension h from the flame outlet surface 5 to the constriction part 8 is
Adjust so that it is within the range of 1 bow to ShS 2 bow.

By doing so, a sufficient recirculation flow of secondary air can be formed on the flat part 5a of the flame outlet surface 5, so that the flame retention effect formed on the flame outlet surface 5 is improved. At the same time, the mixing of the mixed gas and the secondary air is also promoted.If the flame retention effect is high, it is possible to prevent lift for fuels with a slow combustion rate such as natural gas, and it is also possible to promote the mixing of the mixed gas and the secondary air. By promoting the mixing of the mixed gas, the primary air amount of the mixed gas can be reduced, and the width a of the flame port 5b can be made small. As explained above, the combustion device of the present invention has a combustion chamber formed by the throttle part and the combustor frame, and the burner nozzle face facing the combustion chamber. By making it possible to adjust the dimension from the flame opening surface to the throttle part, it is possible to forcibly mix the mixed gas and secondary air for fuels with poor diffusion, and for other fuels. In this way, a sufficient recirculation flow is created by the secondary air to promote mixing of the mixed gas and the secondary air, so even fuels with poor diffusion, such as gasified liquid fuels, are completely combusted. It is possible to prevent lift for slow-burning fuels and to prevent flashback for fast-burning fuels, so that one combustion device can completely and stably burn all fuels. It can be burned.

This eliminates the need for producers to prepare two production lines, one for combustors that handles fuels with poor diffusion and one for combustors that handle other fuels, and allows them to share them. As a result, the number of production lines can be reduced.Also, on the user side, there is no need to replace part or all of the combustion equipment even if the fuel used changes, which has the effect of reducing costs. Furthermore, in the apparatus of the present invention, since the amount of primary air can be reduced, the capacity of the fan that feeds the primary air can be reduced, and the combustion apparatus can be made smaller.
In the above-mentioned embodiment, a boat part is formed in the burner, and this boat part is supported by rectifying plates from both sides in order to improve performance, but these are not necessarily necessary. isn't it. Further, by incorporating the burner into the combustor frame, the entire combustion apparatus is made into an integral structure and made compact, but it is also possible to configure the burner and the combustor frame separately. Furthermore, ``the combustor frame and the heat exchanger are configured separately, and the heat exchanger is attached to the combustor frame, without necessarily having a structure in which the combustor frame and the heat exchanger are used as each other.'' Furthermore, the means for adjusting the dimension from the burner opening surface to the constriction part is composed of a recess formed in multiple stages and a support plate for the burner inserted into the recess. However, the present invention is not necessarily limited to this method; for example, the boat portion may have a structure that can be expanded and contracted.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the combustion apparatus of the present invention;
FIG. 2 is an enlarged perspective sectional view of the combustion section of the combustion device shown in FIG. 1, and FIG. 3 is for explaining the optimum dimensions of each part in the combustion section of the combustion device shown in FIGS. FIG. 3 is a longitudinal cross-sectional view of the combustion section shown in FIG. 1... Combustor frame (heat exchanger), 2...
...Burner, 3...Mixing chamber, 5...
Burner mouth surface, 5b... Burner mouth, 6... Boat part, 6a... Passage, 8... Throttle part, 8a...
...open□" 9... combustion chamber, 11... recess, 12...
Support plate, 12a... hole, 13... rectifier plate, h.
...Dimension from the flame mouth surface to the aperture part. Field diagram groove Z diagram group 3 diagram

Claims (1)

[Claims] 1. A combustor frame, a burner including a mixing chamber and a flame port surface, a constriction section provided in the combustor frame, and a combustion chamber formed by the constriction section and the combustor frame. The burner's flame opening faces into the combustion chamber so as to face the opening of the throttle part, and the mixed gas is ejected from the flame nozzle on the burner opening into the combustion chamber, and secondary air is supplied to both sides of the flame opening. Supplied from
A combustion apparatus characterized in that the combustion apparatus is further provided with means for arbitrarily adjusting the dimension from the flame opening surface to the constriction part. 2 A port section having a passage for supplying the mixed gas in the mixing chamber to the flame opening surface is formed in the burner, and rectifying plates are provided on both sides of this port section to support this port section and to rectify secondary air. Claim 1 characterized in that
Combustion device as described in section. 3. The combustion device according to claim 1 or 2, characterized in that the combustor frame is configured to double as a heat exchanger. 4. A combustion device according to any one of claims 1 to 3, comprising a burner built into a combustor frame. 5. A means for arbitrarily adjusting the dimension from the flame opening surface to the constriction part is provided by forming recesses in multiple stages on both inside sides of the combustor frame near the bottom of the burner, and installing a support plate with a large number of holes in the recesses. 5. The combustion device according to claim 4, wherein the burner is supported by inserting the support plate, and the insertion position of the support plate into the recess can be arbitrarily changed. 6 When the width of the flame opening on the flame opening surface is a, the width of the aperture of the constriction part is b, and the thickness of the constriction part is t, b = a + (0 to 3 m
m) The combustion device according to any one of claims 1 to 5, wherein a, b, and t are configured so that 3 mm≦t≦15 mm. 7 When the dimension from the flame mouth surface to the constriction part is h, if the handled fuel is a fuel with poor diffusion, 5mm≦h≦10
mm In the case of other fuels, h is adjusted so that 10 mm≦h≦20 mm.The combustion device according to any one of claims 1 to 6, characterized in that h is adjusted so that 10 mm≦h≦20 mm.