JPH02146404A - combustor - Google Patents

Abstract

PURPOSE:To ensure a wide range of burning and improve the durability by providing a porous cylinder on the inner surface of the circumferential wall of the burner body and a smoothing cylinder tightly in contact with said porous, cylinder, said smoothing cylinder comprising a lower poreless part and an upper porous part which corresponds to the area of vertical elongate flame holes with the boundary between the elongate main flame holes and the round auxiliary flame holes. CONSTITUTION:The premixed gas vapor is delivered to the burner body 15 through a narrowed part 16 and small holes 20a in an equalizer plate 20 as it spirals in the vaporizing mixing chamber 11, and is ejected out of the main flame holes 17 and auxiliary flame holes 17a in the circumferential wall. When ignited by an ignition means, the burning is started to form a flame close to the outer porous cylinder 18 near the main flame holes 17 and auxiliary flame holes 17a. The flame formed around the main flame holes 17 is vertically balanced and stable and not susceptible to lifting as the mixed gas is uniformly distributed by the pored part 19c of the smoothing cylinder 19. Further, as the path of the mixed gas to the auxiliary flame holes 17a is very long and narrow, the flow speed of the mixed gas to the auxiliary flame holes 17a is reduced, therefore, the flame at the auxiliary flame holes 17 becomes small. Therefore, its thermal effect on the main flame holes 17 becomes small, and the temperature increase of the pored cylinder 18 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustor used in a heater or the like.

Conventional technology In general, this type of combustor vaporizes liquid fuel supplied from a nozzle in a vaporization cylinder, mixes it with combustion air supplied from an air supply pipe, and vaporizes a premixed gas of this air and fuel. Burner was ejected from a burner head 1 at the top of the cylinder as shown in FIG. 4, a vertically elongated main flame port 2 provided on the peripheral wall, and an auxiliary flame port 3 in a round hole for combustion.

Problems to be Solved by the Invention However, when the main flame port 2 of the combustor performs combustion with a small amount of combustion, the stability of the flame and the fixation of the main flame port 2 formed at the main flame port 2 ( Due to the preheating of the auxiliary flame port 3, which is provided to improve the flame holding power (hereinafter referred to as flame holding power), there is a risk that the outer porous tube 4 at the lower part of the main flame port may become particularly hot. was heated abnormally, raising concerns about its durability.

In addition, since the main flame port 2 is vertically elongated, the flame becomes elongated and slender, and tends to lift under conditions of excess air, causing the flame current of the flame rond to drop rapidly and combustion to stop. etc., resulting in a very narrow combustion width.This is because the combustion width can be kept wide by setting the flame current value that stops combustion lower than before, but the flame stability is poor. Lowering the flame current setting would lead to the generation of combustion noise due to lifting combustion, carbon monoxide due to incomplete combustion, odor, etc., and could not be adopted in practice.

The present invention has been made in view of the above points, and aims to provide a highly reliable combustor that maintains a wide combustion width while improving durability.

Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention is directed to Burnabode! ! (a) A perforated cylinder and a rectifying cylinder that closely adheres to the perforated cylinder are arranged on the inner periphery of the peripheral wall, and the rectifying cylinder has a non-porous part at the bottom and a non-porous part at the upper part, with the boundary between the vertically elongated main flame port and the auxiliary round hole. The part facing the vertically elongated flame opening is the &L part.

Effect of the Invention With the above-described configuration, the present invention allows gas to be uniformly dispersed by the @j+fL portion of the rectifying tube and directed toward the main flame port, and the gas path to the auxiliary flame port is lengthened, so that the gas flow rate toward the auxiliary flame port is significantly increased. As a result, the auxiliary flame port becomes small, and the thermal influence on the main flame port is reduced, making it possible to significantly reduce the temperature rise of the porous cylinder located at the main flame port.

In addition, because the gas is evenly distributed, the flame at the main flame port is well-balanced in the vertical direction, resulting in excellent stability and an extremely strong flame-holding ability that is difficult to lift. .

Embodiment Below, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 11 denotes a bottomed cylindrical vaporizing/mixing cylinder, and a fuel supply nozzle 12 is installed at an eccentric position on a part of its peripheral wall. and an air supply pipe 13 for supplying combustion air. 14 is a heater embedded in the vaporization/mixing cylinder 11, and 15 is the vaporization/mixing cylinder 1.
The burner body covers the upper opening of the vaporizing/mixing cylinder 1 and has a narrow part 16 at the bottom that projects into the vaporizing/mixing cylinder 11. 17 is a vertically elongated main flame port formed on the peripheral wall of the burner body 15;
7a is a circular auxiliary flame hole formed at the bottom between the main flame holes 17, and 18 is a porous tube such as a wire mesh attached to the inside and outside of the peripheral wall of the burner body 15, and spot welding 18a is performed between each flame hole.
It is fixed to the burner body 15 at L. Reference numeral 19 denotes a rectifier tube disposed in close contact with the grooved hole tube 18 in the peripheral wall of the burner body. Non-porous part 19a,
The upper portion facing the main flame port 17 is a porous portion 19c having a plurality of small holes 19b. 20 is a pressure equalizing plate provided inside the burner body 15, 21 is a double burner cap covered over the upper opening of the burner body 15, 22 is a nut for fixing the double burner cap 21, and 23 is a main flame port. Frame rond provided opposite to one of 17, 24
is a burner case surrounding the vaporizing/mixing cylinder 11. The porous tube 18 installed on the outer periphery of the side wall of the burner body 15 has its lower end covered with the flange portion 11a of the vaporizing tube 11 and its upper end covered with the bent edge 21a of the burner cap 21, so that it is in close contact with the burner body 15. It is gaining support.

In the above configuration, the vaporizing/mixing cylinder 11 is
The fuel injected inside is vaporized in the vaporization/mixing cylinder 11 which is heated to a high temperature by the sheathed heater 14, and is premixed with combustion air sent into the vaporization/mixing cylinder 11 by a blower or the like. This premixed vaporized gas is transferred to the vaporization and mixing cylinder 1.
While swirling within the burner body 15, it is jetted into the burner body 15 through the narrow part 16 of the burner body 15 and the small hole 20a of the pressure equalizing plate 20, and is ejected from the main flame port 17 and the auxiliary flame port 17a on the outer peripheral wall. When the flame is ignited using an appropriate ignition means, combustion starts and a flame is formed that is in close contact with the outer porous cylinder 18 around the main flame port 17 and the auxiliary flame hole 17a.

Here, as shown in FIG. 3, the flame formed at the main flame port 17 is generated in the vertical direction because the mixed gas directed toward the main flame port 17 is uniformly dispersed in the porous portion 19c due to the presence of the rectifying tube 19. It is well-balanced and has excellent stability, and it has a very strong flame-holding ability that is difficult to lift. Furthermore, as the mixed gas path up to the auxiliary flame port 17a is much longer and narrower than before, as shown by arrow A in Figure 3, the flow velocity of the mixed gas toward the auxiliary flame port 17a is significantly reduced, and the auxiliary flame The pilot flame becomes small, the thermal influence on the main flame port 17 is reduced, and the temperature rise in the porous tube located below the main flame port 17 can be significantly reduced.

Therefore, even if the ratio of fuel and air changes slightly, lift combustion will no longer occur, and problems such as flapping noise and carbon monoxide generation due to lift combustion will be eliminated, and lift combustion will not occur in the past. As a result, the combustion range can be made even wider.

Furthermore, as mentioned above, since the flame formed at the main flame port 17 is highly flame-holding and stable, the detection output of the flame rod 23 is naturally also stable. Detection over time is also accurate with little variation. Moreover, since the premixed gas ejected from each main flame port 17 is uniformly dispersed at the time of ignition, the ignition test can be performed quickly.

Effects of the Invention As is clear from the description of the embodiments, according to the present invention, the temperature of the porous body can be significantly lowered while maintaining a wide combustion range, and stable combustion performance is guaranteed under long-term use. It has great effects, such as being highly reliable and having a simple configuration, it can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts of a combustor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the entire combustor, FIG. FIG. 3 is a cross-sectional view showing a flame formation state. 11... Mixing part, 15... Burner body, 17... Flame hole, 18... Porous tube,
19... Rectifier cylinder, 19a... Non-porous part,
19c... Porous part. Name of agent Patent attorney Shigetaka Awano 1 person 11--1 Mixed words Iku + 5-1 17-... Committee 18- Le hole tube 2≠- Police flow 19α Figure 1 figure

Claims (1)

[Claims] A burner that includes a mixing section that mixes air and fuel, and a plurality of vertically elongated main flame ports provided on the outer peripheral wall of the mixing section that mixes air and fuel, and combusts the mixed gas from the mixing section through a plurality of vertically elongated main flame ports installed at the bottom between the main flame ports, and a circular auxiliary flame port provided at the bottom between the main flame ports. a body, and a perforated cylinder disposed on the inner and outer peripheries of the peripheral wall of the burner body, a rectifying cylinder closely attached to the perforated cylinder is disposed on the inner periphery of the perforated cylinder on the inner periphery of the peripheral wall of the burner body, and the rectifying cylinder is a combustor with a boundary between the vertically elongated main flame port and the circular auxiliary flame port, the lower part being a non-porous part, and the upper part facing the vertically long main flame port being a porous part.