JP2705277B2 - Liquid fuel combustion device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus that mixes a liquid fuel such as petroleum with combustion air and burns it as a mixed gas in a flame hole.

[Prior Art] FIGS. 3 and 4 are a sectional view and a partially cutaway plan view of a conventional liquid fuel combustion apparatus disclosed in Japanese Utility Model Publication No. Sho 60-16833, for example. The combustion apparatus includes a combustor 3 having a cylindrical shape as a whole having an outer cylinder 1 and an inner cylinder 2 joined at one end by end walls. Outer cylinder 1 and inner cylinder 2
Is formed as an annular evaporative mixing chamber 4 having a bottom with an end wall. Both ends of the inner cylinder 2 are open and serve as a passage for passing secondary air for combustion. An air supply port 5 for introducing primary air for combustion is opened on the side of the end wall side of the outer cylinder 1, and a fuel injection nozzle 6 is attached to the air supply port 5 so as not to close the air supply port 5. ing. The inside of the vaporization mixing chamber 4 is formed, for example, in a spiral shape by a partition wall 7. A partition plate 8 is provided on the open side of the vaporization / mixing chamber 4, and the vaporization / mixing chamber 4 and the combustion section 9 are separated by the partition plate 8. Partition plate 8
A communication port 8a is opened in the vicinity of the partition wall 7, and the vaporization / mixing chamber 4 and the combustion section 9 communicate with each other through the communication port 8a. A first burner plate 30 made of brass forging and having a mixture passage 10 in the center thereof is mounted on the upper side of the partition plate 8 in the drawing, that is, on the combustion section 9. The first burner plate 30 has a plurality of flame holes 31 formed in the outer peripheral portion thereof. On the first burner plate 30, a second burner plate 33 made of stainless steel and having a flame hole 32 formed of double rows of slits formed on the entire circumference is mounted in a lid shape. The combustor 3 itself is a combustion device main body.
A passage 12 is formed between the combustion device main body 11 and the outer cylinder 1 of the combustor 3 and passes the secondary air for combustion.
Combustion chamber formed by the combustion device main body 11 of the combustion section 9 constituted by the first burner plate 30 and the second burner plate 33
I am facing thirteen. An electric heater 14 is buried in the combustor 3 and heats the wall of the vaporization / mixing chamber 4.

The combustion operation of the liquid fuel combustion device having the above configuration is as follows. That is, liquid fuel is supplied from the fuel injection nozzle 6 and primary air is supplied from the air supply port 5 into the vaporization / mixing chamber 4 which is heated by the electric heater 14, and the vaporization / mixing chamber 4 is swirled as shown by the arrow in the figure. While being vaporized and mixed, it becomes an air-fuel mixture. The mixture is guided to the flame holes 31 and 32 through the communication port 8a of the partition plate 8 and the mixture passage 10 of the first burner plate 30, and ignited by ignition means (not shown) to form a flame and burn each. . The fluid to be heated (not shown) is heated by the combustion of the air-fuel mixture, and heat required for vaporizing the liquid fuel or preheating the air-fuel mixture is recovered.

[Problems to be Solved by the Invention] In the above-described conventional liquid fuel combustion apparatus, the combustion section 9 is composed of two parts, a first burner plate 30 and a second burner plate 33, and the materials of both parts are different. As a result, deformation due to thermal stress such as heat shock due to ON / OFF operation of combustion occurs, and the first burner plate 30
There is a gap between the burner plate 33 and abnormal combustion (backfire) or abnormal heating of the burner plate. This makes it difficult to obtain stable combustion over a long period of time. In addition, the path of the mixed gas from the vaporization mixing chamber 4 to the flame hole is short, and the gas reaches the flame hole and burns before vaporization and mixing is not sufficiently advanced, so that there is a problem to be solved such that the combustion range is narrow.

The present invention has been made in order to solve such a conventional problem, and by the configuration of the combustion portion with less thermal deformation, stable combustion can be obtained for a long time, and the mixed gas having sufficiently advanced vaporization and mixing into the flame hole is provided. It is an object of the present invention to obtain a liquid fuel combustion device having a wide combustion range that can be supplied.

[Means for Solving the Problems] A liquid fuel combustion apparatus according to the present invention includes a vaporization mixing chamber formed between an outer cylinder and an inner cylinder and configured to mix air and gas into a mixed gas; A bulge portion that covers the upper side, is fitted between the outer cylinder and the inner cylinder, and bulges out into the combustion chamber so that the outer peripheral portion faces the inner wall of the outer cylinder, and is radially extended from the outer peripheral portion and extends inside the outer cylinder. And a burner plate made of a single molded product with a flange that fits into the burner plate. A plurality of hole-shaped flame holes are formed in the bulge portion of the burner plate at the outer peripheral portion and the end surface thereof. The flame hole is opened in the radial direction, and the flame hole on the end face is opened in the center forward direction, respectively, and defines the vaporization mixing chamber and the inner surface of the burner plate, and extends along the inner cylinder with the burner plate at a portion extending along the inner cylinder. A bypass path for the mixed gas is formed between the inner cylinder and the inner cylinder. A rectifying plate for rectifying gas is provided.

[Operation] In the present invention, the burner plate, which is the core of the combustion section, is not a combination of a plurality of parts made of different kinds of metal materials but is an integrally molded product of a single material. Deformation is less likely to occur, the instability of the structure of the combustion part is eliminated, stable combustion can be obtained for a long time, and the mixed gas of the vaporization and mixing part is guided to each flame hole of the burner plate via the cylinder part of the straightening plate For,
As the path of the mixed gas becomes longer and the mixing temperature becomes higher, the mixing of the fuel and the primary air for combustion proceeds sufficiently.

In addition, a passage is formed along the inner wall of the outer cylinder by a flange radially protruding from the bulging portion between the outer wall of the outer cylinder and the outer peripheral portion of the burner plate facing the outer cylinder from the flame hole of the outer peripheral portion to the combustion chamber. As a result, the mixed gas spreads sufficiently in the radial direction and is rectified to obtain stable combustion.

Embodiment FIG. 1 is a sectional view showing a liquid fuel combustion apparatus as one embodiment of the present invention. As can be seen from this figure, this liquid fuel combustion apparatus is characterized by the configuration around the combustion section, and the configuration of other parts is the same as the above-described conventional example. Therefore, the same or corresponding components as in the conventional example are denoted by the same reference numerals in the drawings, and description thereof will be omitted to avoid duplication.

The feature of the liquid fuel combustion apparatus of this example is that the burner plate 15 which is the core of the combustion section 9 is formed of a single member, and includes the vaporization mixing chamber 4 having a wide path and a long path. That is, the burner plate 15 is provided with a flange 16 fitted into the outer cylinder 1 of the combustor 3 and a bulged portion 17 of a two-stage deep drawing which is fitted between the outer cylinder 1 and the inner cylinder 2 inside the outer cylinder 1. Are formed as a convex integral molded product. The center of the bulging portion 17 is formed with a fitting / fixing portion 18 as a mounting structure for the inner cylinder 2, and the fitting / fixing portion 18 continues to the flange 16 via a small diameter portion 17a and a large diameter portion 17b. Large diameter portion at bulging portion 17 of burner plate 15
A plurality of flame holes 19 and 20 are formed in the outer peripheral portion and the end surface of 17b, respectively, and open to the combustion chamber 13 side. The flame holes 19 on the outer peripheral portion are opened in the radial direction, and the flame holes 20 on the end face are opened in the center line direction, and a wire mesh 21 for back prevention is stretched inside them by spot welding. Small diameter part 17 of bulging part 17
The outer peripheral portion a faces the inner peripheral surface of the outer cylinder 1 with a space therebetween, and the flange 16 has its end face fitted to the outer cylinder 1 and the outer cylinder 1
Are engaged with each other. The vaporizing / mixing chamber 4 is defined by a flow regulating plate 22 mounted on a step portion of the outer cylinder 1 together with the flange 16 of the burner plate 15. The current plate 22 has a cylindrical portion 22a at the center thereof which surrounds the outer periphery of the inner cylinder 2 at an interval.
And a wire mesh 23 is mounted on the upper side in the figure of the cylindrical portion 22a. Reference numeral 24 in the drawing denotes an umbrella attached to the burner plate 15, which spreads the secondary air for combustion outward to prevent the flame from touching the burner plate 15.

Also in this liquid fuel combustion device, the air-fuel mixture can be burned in the same manner as the combustion operation described in the conventional liquid fuel combustion device. However, in the liquid fuel combustion device according to the present embodiment, the burner plate 15 which is the core of the combustion unit 9 is formed of a single member, and is hardly deformed by thermal stress such as heat shock due to ON / OFF operation of combustion.
Since there is no gap in the structure required to maintain proper combustion, abnormal combustion (backfire) and abnormal heating of the burner plate 15 do not occur, and stable combustion can be obtained for a long time. is there. In addition, rectifier plate
22 widens the vaporization mixing chamber 4 around the inner cylinder 2,
Furthermore, since the mixture flow path to each of the flame outlets 19 and 20 is long, the vaporization of the liquid fuel proceeds sufficiently and the mixed gas with a high mixing temperature in a good mixed state with the primary air for combustion is used. Can be supplied to each of the flame holes 19 and 20, so that the combustion range is wide and the input control width is also expanded. FIG. 2 shows the relationship between the amount of combustion air and the amount of combustion consumed between the conventional example and the embodiment. The broken line indicates the conventional example and the solid line indicates the embodiment. In FIG. 2, the lower limit of Co shows a line where incomplete combustion occurs when the fuel is fixed and the amount of combustion air is gradually reduced. Further, if the amount of combustion air is gradually increased, incomplete combustion occurs equally.

Therefore, the stable combustion range is within the Co upper and lower limit, and the input control range is set within the stable combustion range. As is clear from FIG. 2, according to the present embodiment, the stable combustion range is expanded and the input control range is expanded at the same time as compared with the conventional example.

[Effects of the Invention] As described above, according to the present invention, according to the present invention, the burner plate serving as the core of the combustion section is not formed by combining a plurality of parts made of different kinds of metal materials, but made of a single material. Because it is an integrally molded product, deformation due to thermal stress such as heat shock does not easily occur, the instability of the structure of the combustion part is eliminated, stable combustion can be obtained for a long time, and through the cylinder of the current plate Since the mixed gas in the vaporization mixing section is guided to each flame hole of the burner plate, the path of the mixed gas is lengthened, the mixing temperature is increased, and the fuel and the primary air for combustion are sufficiently mixed. The effect of expanding both the range and the input control width can be obtained.

In addition, a flange that protrudes radially from the outer peripheral portion of the burner plate can secure a path leading to the combustion chamber from a flame hole provided in the outer peripheral portion between the inner wall and the outer peripheral portion of the outer cylinder, so that it is stable. This has the effect of obtaining flammable combustion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the configuration of a liquid fuel combustion apparatus as one embodiment of the present invention, FIG. 2 is an explanatory diagram comparing the characteristics of a conventional example and that of the embodiment, and FIG. FIG. 4 is a cross-sectional view showing a configuration of a liquid fuel combustion apparatus according to the related art, and FIG. In the figure, 1 is an outer cylinder, 2 is an inner cylinder, 3 is a combustor, 4 is a vaporization and mixing chamber, 9 is a combustion part, 13 is a combustion chamber, 15 is a burner plate, 16 is a flange, 17 is a bulging part, 17a Is a small diameter portion, 17b is a large diameter portion, 19 and 20 are flame holes, 22 is a current plate, and 22a is a cylindrical portion. The same reference numerals in the drawings indicate the same or corresponding parts.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Osamu Monma, Inventor 1-3-3 Komabacho, Nakatsugawa City, Gifu Prefecture Inside Nakatsugawa Works, Mitsubishi Electric Corp. (56) References Japanese Utility Model Sho-64-54617 (JP, U) Showa 60-16833 (JP, Y2)

Claims (1)

(57) [Claims] 1. A vaporization / mixing chamber formed between an outer cylinder and an inner cylinder and configured to mix air and gas into a mixed gas; A burner consisting of a single molded product of a combustion chamber and a bulging portion that bulges out so that an outer peripheral portion thereof is opposed to the inner wall of the outer cylinder, and a flange that extends radially from the outer peripheral portion and fits in the outer cylinder. The burner plate has a bulging portion formed with a plurality of hole-shaped flame holes on the outer peripheral portion and the end surface thereof. The flame hole on the outer peripheral portion is opened in the radial direction, and the flame hole on the end surface is located at the center. Opening each in the forward direction, defining a vaporization mixing chamber and an inner surface of a burner plate, and extending a detour path of the mixed gas between the burner plate and the inner cylinder at a portion extending along the inner cylinder. And a rectifying plate for rectifying the mixed gas is provided. Charge combustion equipment.