JPH0942615A - Burner device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve combustion efficiency by promoting the evaporation of liquid fuel and permitting complete combustion at a high temperature. SOLUTION: An inner cylinder 2 is received in an outer cylinder 1, having an air intake port 9, under a condition that an air flow passage 14 is formed around the inner tube 2 while the injection tube 3 of combustion air, a fuel supplying tube 4, an evaporating means 5 and an igniting means 6 are provided in the inner cylinder 2. Liquid fuel, dripped from the fuel supplying tube 4 onto the igniting means 6, in which heat is generated, is ignited while the liquid fuel, dripped from the injection tube 4, is dispersed by air, injected from the injection tube 3 into the inner cylinder 2 so as to obtain atomized fuel and promote evaporation of the fuel whereby complete combustion at a high temperature is permitted and combustion efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner device capable of efficiently burning fuel such as kerosene and heavy oil efficiently and capable of high temperature combustion.

[0002]

2. Description of the Related Art A liquid fuel is combusted by vaporizing it into vapor, and this vapor receives oxidation of heat and oxygen above the ignition point and causes an oxidation reaction to burn. Therefore, the conditions for the liquid fuel to satisfactorily burn are that there is sufficient heat to maintain the combustion, that vaporization is performed properly and satisfactorily, and that the combustion air and the liquid fuel that are oxygen sources are The good mixing with the vapor generated by vaporization is mentioned.

Burner devices are commonly used to burn liquid fuels. In this burner device, various conditions have been devised in consideration of the conditions for the above-mentioned liquid fuel to satisfactorily burn. As a conventional burner device for liquid fuel, a vaporizer such as a venturi is built in, and the liquid fuel is atomized in advance by this vaporizer and then sent to a burner nozzle so that it is sprayed from the tip of this nozzle. In general, the burner nozzle itself is devised so that the liquid fuel is atomized directly from the nozzle tip.

Since the liquid fuel atomized in the air in this way is extremely fine liquid particles, the total surface area of the liquid fuel becomes very large. Evaporation is actively performed by the increase in the surface area, and the contact area with the air is increased, so that the atomized liquid fuel is easily supplied with oxygen, and combustion is favorably performed.

[0005]

However, in the conventional burner apparatus as described above, it is said that the liquid fuel sprayed from the tip of the nozzle of the apparatus is divided into innumerable fine particles. However, since the liquid state is maintained until it completely evaporates, vaporization has to be performed once as a mechanism of combustion as described above. That is, only the surfaces of the fine fuel particles are vaporized and burned while the liquid remains inside, and the combustion continues as the vaporization of the liquid inside progresses.

In view of the above, the conventional burner device can efficiently burn the fuel by the amount that the contact area with the air is increased by spraying the fuel.
After all, it was not possible to get out of the restriction of the combustion mechanism peculiar to liquid fuel, and there was a limit to the improvement of combustion efficiency.

[0007] Therefore, as a breakthrough of such a conventional burner device, the present inventors have previously proposed a burner device (combustion device for heating, JP-A-2- 110204). This invention has a tubular porous body inside the device body,
An ignition burner is arranged inside the porous body, and liquid fuel is sprayed and supplied toward the inner peripheral surface of the porous body preheated by the ignition burner. The combustion air is supplied from the rear of the ignition burner into the cylindrical porous body.

By doing so, the liquid fuel spray-supplied is adsorbed by the porous body that has been preheated to a high temperature, and heat is obtained from it, and at the same time, it receives the catalytic action of silica, alumina, etc., which are components of the porous body. It is instantly pyrolyzed and reformed to a gaseous fuel, burned in a gaseous state and discharged from the combustion gas outlet. That is, the burner device disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2-110204 is one in which liquid fuel is reformed into gas combustion and then this gas fuel is burned, and the mechanism of combustion is just vaporization of liquid. This is fundamentally different from the conventional nozzle-injection type burner device in which combustion is performed.

However, this burner apparatus is suitable for large-scale heating which consumes a large amount of fuel, and is suitable for applications such as heating furnaces for ceramics where heating of the inside of the furnace is suppressed by suppressing the supply of fuel. Not a good fit.

Therefore, an object of the present invention is to have a relatively simple structure, which is easy to manufacture, and is easy to operate. Further, almost all of the supplied liquid fuel is vaporized into a gaseous fuel. The present invention is to provide a burner device that has been reformed and is a liquid fuel, but acts completely as a gaseous fuel at the time of combustion, and as a result, the combustion efficiency is remarkably improved as compared with the conventional burner device for liquid fuel. .

[0011]

In order to solve the above problems, according to the invention of claim 1, the tip side is a combustion gas discharge port and the base side is a combustion air intake port. And an outer cylinder provided with, and accommodated in the outer cylinder in a state where an air flow passage is formed between the outer peripheral surface and the inner peripheral surface of the outer cylinder,
Combustion gas outlet on the tip side, an inner cylinder with a base wall on the base end side, and an inner cylinder located inside the inner cylinder, where the base wall opens outside the inner cylinder for combustion An ejection pipe of combustion air having a large number of air ejection holes around it, which faces the air intake port, and is located immediately above the ejection pipe in the inner cylinder,
A fuel supply pipe arranged so as to penetrate the base end wall portion of the inner cylinder from the base end side of the outer cylinder; and an ignition means arranged at a position directly below the base end side of the ejection pipe in the inner cylinder, The fuel supply pipe, which is provided on the inner circumference of the inner cylinder in front of the fuel supply pipe so as to communicate with the inside of the fuel supply pipe, and which comprises vaporization means for vaporizing the fuel supplied from the fuel supply pipe and discharging the fuel forward. Has a required number of fuel outflow holes, and a fuel derivation rod-shaped body provided so as to project downward from the fuel outflow holes located at the base end side penetrates the jet pipe of the combustion air, and its lower end. It employs a structure that faces directly above the ignition means.

According to the second aspect of the present invention, the remaining fuel outflow hole provided in the fuel supply pipe is provided with a rod-shaped body for fuel derivation which penetrates this fuel outflow hole and projects to the outside. It is a thing.

The invention of claim 3 adopts a construction in which the ignition means is housed in a cylindrical body, and a passage hole for fuel dripping from the rod-shaped body is provided in the upper portion of the cylindrical body.

According to a fourth aspect of the invention, in the vaporizing means, a fuel passage having one end communicating with the fuel supply pipe is formed between the fitted inner ring and outer ring, and the other end of the fuel passage is formed between the inner cylinder and the outer ring. The structure is such that it communicates with the annular gap formed in.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the burner device of the present invention is
An outer cylinder 1, an inner cylinder 2 concentrically incorporated in the outer cylinder 1, a combustion air ejection pipe 3 concentrically arranged inside the inner cylinder 2, and an ejection pipe in the inner cylinder 2. 3, a fuel supply pipe 4 disposed immediately above the inner cylinder 2, a vaporization means 5 also disposed in front of the fuel supply pipe 4 inside the inner cylinder 2, and a position immediately below the base end side of the ejection pipe 3 inside the inner cylinder 2. It is composed of an ignition means 6.

The outer cylinder 1 has a combustion gas discharge port 7 on the front end side thereof, and a combustion air intake port 9 is provided in the central portion of a closing wall 8 on the base end side thereof. The portion of the refractory material 10 that is inserted into the mounting hole 11 from the outer surface side and the opening of the mounting hole 11 on the inner surface side of the furnace wall is the combustion gas discharge port 12 that is narrowed to a diameter slightly smaller than the outer cylinder 1. There is.

The inner cylinder 2 is formed to have an outer diameter that is slightly smaller than the inner diameter of the outer cylinder 1 and a length that is shorter than the outer cylinder 1. 13 is coaxially incorporated into the outer cylinder 1 to form an annular air flow passage 14 between the outer peripheral surface and the inner peripheral surface of the outer cylinder 1.

The inner tube 2 has a combustion gas outlet 1 on the tip side.
5, the base end side is closed by the base end wall portion 16, and the internal space is a primary combustion chamber 17 for vaporizing and burning the liquid fuel. Further, a barrier 41 is provided on the inner circumference of the outlet 15 of the inner cylinder 2 so that the outflow of the primary combustion gas can be controlled.

The jet pipe 3 of the combustion air has a cylindrical shape with a diameter smaller than that of the inner cylinder 2, is arranged coaxially in the primary combustion chamber 17 of the inner cylinder 2, and the opening 18 on the base end side is the base end. Wall 16
Is located immediately in front of the intake port 9 and is closed by the front end wall 19, and a large number of air ejection holes 20 are provided side by side on the peripheral wall.

A part of the combustion air supplied from the intake 9 of the outer cylinder 1 into the air chamber 13 flows into the combustion air ejection pipe 3, and the inner air 2 is ejected from the surrounding air ejection holes 20. While being ejected into the primary combustion chamber 17 inside, most of the remaining combustion air passes through the air passage 14 between the inner cylinder 2 and the outer cylinder 1,
It will flow out to the secondary combustion chamber 21 formed at the tip of the outer cylinder 1. By closing the tip of the ejection pipe 3, the ejection pipe 3 resists the inflow of combustion air and suppresses the inflow of an excessive amount of air. The air flowing through the passage 14 cools the outer cylinder 1.

The fuel supply pipe 4 is a metal pipe,
The base wall of the fuel supply pipe 4 penetrates through the closing wall 8 of the outer cylinder 1 and the base end wall portion 16 of the inner cylinder 2 and is inserted in the inner cylinder 2 so as to be positioned directly above the ejection pipe 3 in a parallel state. The oil supply pipe 22 for fuel supply connected to the liquid fuel supply source is connected to the side of the inner cylinder 2
A plurality of fuel outlet holes 23 and 2 are provided on the peripheral wall of the portion located inside.
4 are provided.

As shown in FIGS. 1 and 2, the fuel outflow hole 23 is located at the base end side, and the outflow hole 23 is open on the lower surface with respect to the fuel supply pipe 4. In contrast, the vertical rod-shaped body 25 penetrates so as to project downward, and the remaining other outflow holes 24 are provided so as to open on both side surfaces. A bar-shaped body 26 that horizontally penetrates through and has both ends bent obliquely downward
Is incorporated.

Inner diameters of the fuel outflow holes 23 and 24 and the rod-shaped body 2
In any case, the relationship of 5 and 26 forms a gap between the inner periphery of the outflow hole and the rod-shaped body, through which the liquid fuel can flow out.

Therefore, the liquid fuel supplied to the fuel supply pipe 4 is introduced into the rod-shaped body 2 from the respective fuel outflow holes 23 and 24.
5, 5 and 26 flow out to the outside, and the fuel is dripped from the rod-shaped body 26 into the primary combustion chamber 17 directly above the air ejection pipe 3.

A downward rod 25 of the fuel supply pipe 4
Is extended so as to extend downward, and as shown in FIG. 1 and FIG. 2A, is arranged so as to vertically penetrate the jet pipe 3 of the combustion air and the lower end thereof faces immediately above the ignition means 6. To do. A portion of the ejection pipe 3 through which the rod-shaped body 25 penetrates is provided with a sufficient gap for the liquid fuel to pass through.
The liquid fuel flowing down through the nozzles is surely dropped onto the ignition means 6.

The igniting means 6 uses a plate-shaped heater 6a that heats up by energization, and as shown in FIGS. 1 and 2A, a through hole provided in the lower portion of the base end wall portion 16 of the inner cylinder 2. It is inserted into the inner cylinder 2 from 27 and is arranged so as to face the position immediately below the base end portion of the jet pipe 3 of the combustion air.

A cylindrical tubular body 28 surrounding the plate heater 6a is fixed to the base end wall portion 16 of the inner tubular body 2.
A passage hole 29 for the fuel to be dripped from the rod-shaped body 25 is provided in the upper part of 8, and a plurality of ventilation holes 30 are further provided at the root portion of this cylindrical body 28.

As shown in FIGS. 1 and 3, the vaporizing means 5 forms a fuel passage 33 between the fitting surfaces of the inner ring 31 and the outer ring 32 which are fitted to each other, and the outer peripheral surface of the outer ring 32 and this outer ring. An annular gap 34 is formed between the inner peripheral surfaces of the inner cylinder 2 into which 32 is fitted, and one end of the fuel passage 33 communicates with the fuel supply pipe 4 and the other end communicates with the gap 34. .

The fuel passage 33 has an inner ring 31 and an outer ring 32.
4, which is provided along the circumferential direction between the fitting surfaces of the fuel supply pipe 4, has an inlet 35 provided in the axial direction on one end side across the divided portion provided in the middle and electrically connected to the tip of the fuel supply pipe 4. The outer ring 3 on the end side
2 communicates with the gap 34 via an outlet 36 provided in

The fuel passage 33 is not limited to a simple groove, but is formed in a spiral shape, a zigzag shape, or a labyrinth shape under the condition of connecting the inlet 35 and the outlet 36, and the length of the passage 33 is lengthened to vaporize. The efficiency may be improved.

FIG. 5 shows an example in which the fuel supply amount to a plurality of burner devices is made uniform, and a fuel supply section in each burner device is connected to a branch joint 39 connected to the discharge port of a fuel pump 38 controlled by an inverter 37 or the like. Oil pipe 4
Connected via 2 and 22, inside the oil pipes 22 and 22,
A twisted wire 40 formed by twisting a plurality of thin metal wires is incorporated over an appropriate length range, and a spiral passage formed by the inner peripheral surface of the conduit 22 and the outer peripheral surface of the twisted wire 40 resists the flow of fuel. As a result, the timing and amount of fuel supply to the double-sided burner device are synchronized.

The burner device of the present invention has the above-mentioned structure, and the ignition means 6 is used for heating the inside of the furnace by combustion.
The combustion air from the blower is supplied to the inside of the air chamber 13 through the inlet 9, and the oil supply pipe 2
Liquid fuel such as kerosene or heavy oil is supplied to the fuel supply pipe 4 via 2.

The liquid fuel supplied into the fuel supply pipe 4 is
First, the rod-shaped body 25 located on the base end side is connected to flow down,
It is dropped on the igniting means 6 that has generated heat and ignited.

A part of the combustion air supplied to the air chamber 13 flows into the combustion air ejection pipe 3, and is radially ejected from the surrounding air ejection holes 20 into the primary combustion chamber 17 for the remaining combustion air. Air is ejected into the secondary combustion chamber 21 through the air flow passage 14.

The liquid fuel supplied into the fuel supply pipe 4 is
With the increase in the supply amount, the rod-shaped body 26
It flows out to the outside and drops into the primary combustion chamber 17.

Since combustion air is ejected into the primary combustion chamber 17, the dripped liquid fuel is dispersed in the form of fine mist and ignited by the combustion gas by the ignition means 6, and this primary combustion air is discharged. It is ejected from 15 into the secondary combustion chamber 21.

Further, the fuel in the fuel supply pipe 4 flows into the fuel passage 33 of the vaporization means 5 as the amount increases, and while flowing in the passage 33, the fuel is heated by the combustion heat of the primary combustion chamber 17 and vaporized. The vaporized and vaporized gas flows out from the gap 34 to the primary combustion chamber 17, and the vaporized gas burns the primary combustion chamber 17 to a higher temperature.

The secondary combustion chamber 21 has a surrounding air flow passage 14
Since new secondary combustion air is supplied from this, complete vaporization of the vaporized liquid fuel is achieved in this secondary combustion chamber 21, and from the discharge port 7 of the outer cylinder 1, for example, 1150-12.
A high temperature combustion flame of 50 ° C. is discharged.

As described above, when the combustion in the primary combustion chamber 17 and the secondary combustion chamber 21 is started, the combustion of the liquid fuel in the ignition portion is maintained, so that even if the heat generation of the ignition means 6 is stopped. Burning can continue.

Further, in the above combustion, the liquid fuel is completely vaporized and burned, and the liquid dropped on the ignition means 6 is also burned in the primary combustion chamber 17, so that the liquid fuel does not remain as it is. Even when the fire is extinguished with the supply of liquid fuel and combustion air stopped, no offensive odor is generated by the liquid fuel.

Further, in the above combustion, the liquid fuel and the combustion air are supplied by the inverter control so that the low temperature combustion to the high temperature combustion can be obtained freely.

[0043]

As described above, according to the present invention, the mixing of the liquid fuel and the air is completed, the vaporization of the liquid fuel is efficiently promoted, and the complete combustion is possible, so that the combustion efficiency is greatly improved. However, high temperature combustion is obtained.

Further, since the liquid fuel is completely vaporized and burned, the liquid fuel does not remain inside, and the generation of odor due to non-combustion can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a burner device of the present invention.

2 (A) is a vertical sectional side view taken along the arrow II-II in FIG.
(B) is an enlarged sectional view of the fuel supply pipe in the same as above.

FIG. 3 is a longitudinal side view taken along arrow III-III in FIG.

FIG. 4 (A) is an enlarged vertical sectional view of the vaporizing means, and FIG. 4 (B) is a plan view of the same.

5A is a plan view of a fuel supply means for a plurality of burner devices, FIG. 5B is a cross-sectional view of an oil feed pipe in the same as above, FIG.
(C) is the same vertical section

[Explanation of symbols]

 1 Outer Cylinder 2 Inner Cylinder 3 Combustion Air Jet Pipe 4 Fuel Supply Pipe 5 Vaporizing Means 6 Ignition Means 7 Ejection Port 9 Intake Port 13 Air Chamber 14 Air Flow Passage 15 Outlet 16 Base End Wall 17 Primary Combustion Chamber 20 Air Ejection Hole 21 secondary combustion chamber 23, 24 fuel outflow hole 25 rod-shaped body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ueshima ▲ Taka ▼ Man 1-16-12 Beppu, Settsu City, Osaka Prefecture

Claims (4)

[Claims] 1. An outer cylinder having a combustion gas discharge port on the front end side and a combustion air intake port on the base end side, and between the outer peripheral surface and the inner peripheral surface of the outer cylinder in the outer cylinder. It is housed in a state that an air flow passage is formed in the
An inner cylinder having a proximal wall portion provided on the proximal end side, and an inner cylinder located inside the inner cylinder, which is open to the outside of the inner cylinder at the proximal wall portion and faces the intake port for combustion air. A combustion air ejection pipe having a large number of air ejection holes formed therein, and a base end wall portion of the inner cylinder penetrating from the base end side of the outer cylinder so as to be located immediately above the ejection pipe in the inner cylinder. A fuel supply pipe arranged in the inner cylinder, and an ignition means arranged in the inner cylinder at a position immediately below the base end side of the ejection pipe,
The fuel supply pipe is provided at a position in front of the fuel supply pipe on the inner circumference of the inner cylinder so as to communicate with the inside of the fuel supply pipe, and comprises vaporization means for vaporizing the fuel supplied from the fuel supply pipe and discharging the fuel forward. The pipe has a required number of fuel outflow holes, and a fuel derivation rod-shaped body provided so as to project downward from the fuel outflow holes located on the base end side penetrates the ejection pipe of the combustion air,
A burner device whose lower end faces directly above the ignition means. 2. The burner device according to claim 1, wherein the remaining fuel outflow holes provided in the fuel supply pipe are provided with rod-shaped members for fuel derivation that penetrate the fuel outflow holes and project to the outside. 3. The ignition means is housed in a cylindrical body, and a passage hole for fuel dripping from a rod-shaped body is provided in an upper portion of the cylindrical body.
Or the burner device according to 2. 4. The vaporizing means has a fuel passage having one end communicating with a fuel supply pipe between an inner ring and an outer ring fitted together, and the other end of the fuel passage having an annular shape formed between the inner cylinder and the outer ring. The burner device according to claim 1, wherein the burner device has a structure communicating with the gap.