JPH02275208A - Burner - Google Patents

Abstract

PURPOSE:To widely maintain the combustion range and enhance the durability of a porous cylinder by installing a burner port ring placed in contact with the lower part of an inner wall of a burner body, overlapping its upper end with a part of the lower end of a main burner port and all of the auxiliary burner ports, and providing a round hole smaller than the auxiliary ports all over the sections which overlap with the auxiliary burner ports of the burner port ring. CONSTITUTION:The flames formed in main burner ports 17 are affected by burner port rings 16 so that the velocity of mixed gas at the lower part of the burner may be slower than that in the upper part while the flames in the lower part are small are brought into contact with an outside porous cylinder 18 and turn into powerfully stabilized flames. A mixed gas stream ejected from an auxiliary burner port 17a is throttled by a round hole 16a of the burner port rings 16 and diffused at the auxiliary burner port sections, thereby reducing the velocity and stabilizing the flames of the auxiliary burner port 17a, interfering with the flames of the auxiliary burner port 17a and improving the flame stabilization much more. The flame are brought into contact with a porous cylinder 18, but the flames above the main burner port 17 are subjected by the burner port rings 16 so that the velocity of the mixed gas stream. As a result, the flames are formed at a place distant from the porous cylinder 18, the flames in the lower part of the burner ports are small in volume. Moreover, the durability of the porous cylinder can be improved.

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 and mixes it with combustion air supplied from an air supply pipe, creating a premixed gas of this air and fuel. The fuel was ejected and burned from a vertically long main flame port 2 and a circular auxiliary flame port 3 provided on the peripheral wall of a burner head 1 as shown in FIG. 4 at the top of the vaporizing cylinder.

Problems to be Solved by the Invention However, when the flame port 2 of the upper and final combustor performs combustion with a small amount of combustion, the flame port 2 of the upper burner head is exposed to the gap between the flame port 2 and the porous tube 4, such as a wire mesh, provided on the outer periphery of the burner head. Since a flame is formed and combustion continues, the porous tube 4 becomes red hot to a high temperature, which poses a problem in terms of durability.

Therefore, the flow rate of the mixed gas ejected from the flame port 2 was increased to form a flame outside the porous tube 4, thereby reducing the temperature of the porous tube 4. However, when this method is used, the flame stability deteriorates and the combustion width becomes narrow.

The present invention was made in view of the above points, and aims to provide a highly reliable combustor that maintains a wide combustion area while improving the durability of a porous tube. It is.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a burner body with a burner port ring that is in close contact with the lower part of the inner wall of the burner body, and whose upper end is connected to the lower end of the main burner port 17. Part and auxiliary flame port 17
A, and a circular hole smaller than the auxiliary flame port is provided in the portion of the burner ring that overlaps with the auxiliary flame port.

Effect of the present invention With the above-described configuration, the flow velocity of the mixed gas ejected from the main flame port becomes slower at the lower part of the main flame eye, increasing flame stability.Furthermore, the flame formed at the auxiliary flame mouth is The mixed gas flow restricted by the round hole in the ring is diffused at the auxiliary flame port and the flow velocity decreases, making it stable, and due to the interference with the auxiliary flame, the flame stability of the main flame is even higher. . Therefore, while maintaining the combustion width, it is possible to increase the flow velocity of the mixed gas ejected from the main flame port, reduce the temperature of the porous cylinder, and improve durability.

EXAMPLE Hereinafter, an example of the present invention will be explained using FIGS. 1 to 3. Reference numeral 11 denotes a bottomed cylindrical vaporizing/mixing cylinder, in which a nozzle 12 for supplying fuel and an air supply pipe 13 for supplying air for combustion face an eccentric position on a part of its circumferential wall. 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 11 and has a narrow part 15a 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;
17a is an auxiliary flame port with a thick round hole provided at the bottom of the main flame 17, and 1G is arranged inside the burner body 15 so as to be in close contact with the bottom of the inner wall of the burner body, as is clear from the drawing. The upper part of the burner ring is designed to overlap with a part of the lower end of the main burner port 17 and all of the auxiliary burner ports 17a, and the part that overlaps with the auxiliary burner port 17a is smaller than the auxiliary burner port 17a. A round hole f6a set to the desired diameter is provided.

In other words, the size of the auxiliary flame opening 17a is the same as that of the flame rolling round hole 16.
The effective opening area of the auxiliary flame opening 17a is determined by the flame rolling round hole 16a. On the 1st, a perforated tube such as a wire mesh is attached to the inside and outside of the peripheral wall of the burner body 15, and is fixed to the burner body 15 by spot welding between each flame port. 20 is a pressure equalizing plate provided in the burner body 15, and 21 is the burner body 1.
5, a double burner camp covered in the upper opening; 22, a nut for fixing the double burner cap 21; 23, a frame rod provided opposite to one of the main flame ports 17;
24 is a burner case surrounding the vaporizing/mixing cylinder 11. Note that the porous tube 18 installed on the outer periphery of the side wall of the burner body 15 has its lower end connected to the flange portion 11a of the vaporizing tube 11.
In addition, the upper end is covered with the bent edge 21a of the burner cap 21,
It is adapted to be supported in close contact with the burner body 15.

In the above configuration, the vaporizing and mixing cylinder ll 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 gas swirls in the vaporizing/mixing cylinder 11, flows into the burner body 15 through the narrow part 15a of the burner body 15 and the small hole 20a of the pressure equalizing plate 20, and is ejected from the flame port 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 porous cylinder 18 around the main flame port 17.

Here, as shown in FIG. 3, the flame formed at the main flame port 17 is small because the mixed gas flow rate at the bottom of the flame port is slower than that at the top due to the presence of the flame port ring 16. 18, creating a very strong and stable flame.

Further, the mixed gas flow ejected from the auxiliary flame port 17a is constricted by the round hole 16a of the flame port ring 16 located inside the auxiliary flame port, and diffuses at this auxiliary flame port, causing a decrease in flow velocity. The flame formed at the flame port 17a becomes very stable. The flame formed in the main flame port 17 interferes with the flame formed in the auxiliary flame port 17a, thereby further improving flame stability. In addition, although the flame situation is that of a porous tube, the flame above the main flame port 17 is faster than the conventional one due to the fact that the mixed gas flow rate is increased by the flame port ring 16. Since the flame is formed at a distance from the porous cylinder 18 and the amount of flame at the lower part of the flame is small, there is less temperature interference with the upper part.
The temperature rise in this case is significantly reduced, leading to improved durability of the perforated cylinder for one day.

In addition, from the viewpoint of durability, it is extremely difficult to open the auxiliary flame port 17a smaller than a certain level in the burner body 15, which requires a certain degree of wall thickness for component strength. It becomes possible to open a larger auxiliary burner port 17a and make a hole of a desired size in the burner port ring 16 to make the auxiliary burner port a small hole of the desired size. Therefore, Burnabody 15
Processing becomes easier and productivity improves.

Effects of the Invention As is clear from the description of the embodiments, according to the present invention, the temperature of the porous tube can be significantly lowered while maintaining a wide combustion period, and stable combustion performance can be guaranteed during long-term use. It has great effects, such as being highly reliable, and having a simple structure and easy processing.

[Brief explanation of drawings]

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, 16... Burner mouth ring, 16a...
Round hole, 17...flame port, 17a...auxiliary flame port, 18...porous tube. Name of agent: Patent attorney Shigetaka Awano 1 person/l---
Mud section No. 5 --- Bar 7-blade machining L Otsu - Tohoku Dunk L Otsu a, -- 1 Kuyu ( 17 --- Flame hole l δ - Ichi Yu katatsutsu 3 Figure 4

Claims (1)

[Claims] A mixing section that mixes air and fuel, and the mixed gas from the mixing section is combusted through a plurality of vertically elongated main flame ports provided on the outer peripheral wall of the mixing section and a circular auxiliary flame port provided at the bottom between the main flame ports. It is equipped with a burner body and a porous tube arranged inside and outside the peripheral wall of the burner body, and inside the burner body is arranged a burner ring that fits tightly against the lower part of the inner wall of the burner body, and its upper end is connected to the lower end of the main burner port. A combustor with a round hole that overlaps the auxiliary burner port and the auxiliary burner port, and a round hole that is smaller than the auxiliary burner port in the portion of the burner port ring that overlaps with the auxiliary burner port.