JPH08233218A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE: To stabilize a combustion of liquid fuel, restrict occurrence of tar and its. accumulation, prevent bad odor after combustion or clogging of a combustion nozzle from being produced by a method wherein air is injected from an air, supplying pipe passage arranged at a circumferential wall of a gasification device against liquid fuel injected and supplied from a fuel nozzle so as to cause the fuel to be changed into some fine particles and dispersed. CONSTITUTION: Liquid fuel injected from an extremity end of a combustion nozzle 11 into a gasification chamber 10 is dispersed with air for fuel injected into the gasification chamber 10 from an air nozzle 22 so as to be changed into some fine particles. Then, the fuel is further changed into some fine particles with air injected from a lateral direction toward the gasification chamber 10, a striking surface of the liquid fuel injected and changed into some fine particles as indicated by an arrow (b) becomes large and then the fuel is contacted with a gasification surface of the gasification chamber 10. The liquid fuel is changed into some fine particles and their gasification surface can be made large, so that all the fuels injected from the fuel nozzle 11 are instantly gasified and the gasified fuel gas is mixed with primary combustion air. The mixed gas passes through an throttle plate 13, enters a burner head 14, is injected from a flame hole 16, resulting in that a stable combustion of fuel can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus, and more specifically, it produces and accumulates tar at the bottom of a vaporization chamber by atomizing the liquid fuel ejected from a fuel nozzle and stably combusting it. The present invention relates to a vaporization type liquid fuel combustor used for an oil fan heater and the like in which the above is suppressed.

[0002]

2. Description of the Related Art Generally, in a liquid fuel combustion apparatus of this type, liquid fuel jetted and supplied by a fuel nozzle is vaporized inside, and the vaporized gas and combustion air are premixed and supplied to a combustion section. Equipped with a vaporizer. 3 and 4 showing an example of a conventional liquid fuel combustion apparatus will be described below. 4 (1) is a plan view for explaining a part of the plane of the liquid fuel combustion apparatus as a section, and FIG. 4 (2) is a side view for explaining a part of the side surface of the liquid fuel combustion apparatus as a section. It is a figure. In FIGS. 3 and 4, reference numeral 1 denotes a bottomed cylindrical carburetor having an open upper portion, and a heater 3 which is a sheathed heater is embedded in an upper portion of a peripheral wall 2 of the carburetor 1. Reference numeral 4 denotes an elbow-type primary air pipe for flowing primary air for combustion, and one end of this primary air pipe 4 communicates with a blower 6 via a connecting pipe 5. Reference numeral 7 denotes a fuel supply pipe through which liquid fuel (kerosene) flows, and one end of the fuel supply pipe 7 is communicated with a fuel tank 9 via a pump 8 such as an electromagnetic pump.
In addition, the other end of the fuel supply pipe 7 has a tip at the carburetor 1
It is connected to the base end of a fuel nozzle 11 facing the internal vaporization chamber 10, and the vaporization chamber 10 is connected from the tip of the fuel nozzle 11.
Liquid fuel is jetted out and supplied to. In addition, a detachable cartridge tank 12 is attached to the fuel tank 9.
Is provided.

Reference numeral 13 is a diaphragm plate disposed in the upper opening of the vaporizer 1, and a burner head 14 is fitted and mounted in the upper opening of the vaporizer 1 above the diaphragm plate 13. A wire mesh 15 is attached to both inner and outer surfaces of the burner head 14, and a large number of flame holes 16 are formed in the peripheral wall. Reference numeral 17 is a flame holding plate provided on the upper end of the vaporizer 1, and 2
5 is a baffle.

Reference numeral 18 denotes a bottomed cylindrical burner case provided around the carburetor 1 and surrounding the carburetor 1. Inside the burner case 18, air is blown from the blower 6 via a secondary air pipe 19. Sent in. 20 is a combustion cylinder.

Next, the vaporizer 1 will be described in detail.
This vaporizer 1 is made by aluminum die casting,
The peripheral wall 2 is integrally formed with an air nozzle portion 22 for supplying combustion air, which has a lateral air passage 21 through which the fuel nozzle 11 is coaxially inserted.

Reference numeral 23 in FIG. 3 denotes an ignition electrode for igniting a mixed gas of vaporized gas and air ejected from the flame holes 16,
A flame rod 24 detects the flame F ignited and also detects the oxygen concentration.

In the above-mentioned structure, when the carburetor 1 is heated to a predetermined temperature by energizing the heater 3, the blower 6 and the pump 8 are operated, liquid fuel is discharged from the fuel nozzle 11 and the primary air pipe 4 is discharged. Primary air for combustion is supplied into the vaporization chamber 10 via the air nozzle portion 22. This time,
The combustion air is jetted from the air nozzle portion 22 into the vaporization chamber 10, and the liquid fuel jetted from the fuel nozzle 11 is made into particles and brought into contact with the vaporization surface of the vaporization chamber 10. The vaporized gas of the liquid fuel vaporized by contacting the vaporization surface mixes with the primary air for combustion, and this mixed gas enters the burner head 14 through the passage of the diaphragm plate 13 and is ejected from the flame holes 16. The jetted mixed gas is ignited by the spark discharge of the ignition electrode 23, forms a flame F, and starts combustion.

[0008]

However, in the above-mentioned conventional configuration, the diameter of the fuel particles ejected from the fuel nozzle 11 is not reduced, and the ejected fuel collision surface is shown in FIG. Since it is small as indicated by the arrow a in (2) of 4, when the fuel flow rate is large as in the case of strong combustion, the fuel ejected from the fuel nozzle 11 contacts the vaporization surface of the vaporization chamber 10 and vaporizes. The fuel in the part cannot be completely vaporized at the collision surface and flows down to the bottom of the vaporization chamber. Therefore, there is a problem that vaporization time delay occurs, resulting in unstable combustion, and that tar is generated or accumulated at the bottom of the vaporization chamber.
Further, when the fuel flow rate is small as in the case of weak combustion, the flow rate of the combustion air becomes small, and the fuel ejected from the fuel nozzle 11 is hardly atomized, which causes a delay in vaporization, resulting in instability. There was a problem similar to that at the time of strong combustion as well as a strong combustion.

Further, after the combustion is stopped, the fuel remaining in the fuel nozzle 11 goes out into the vaporization chamber 10 and evaporates, and odor is generated, or the fuel remaining in the high temperature fuel nozzle 11 is tarned and the tip ends. There was a problem of clogging the department.

The present invention has been made in view of the above-mentioned circumstances, and in a wide range of combustion states from strong combustion to weak combustion, unstable combustion is eliminated and stable combustion is performed to prevent tar from reaching the bottom of the vaporization chamber. It is an object of the present invention to provide a liquid fuel combustion apparatus that suppresses the generation and accumulation of the fuel, and prevents the generation of odor after the combustion is stopped and the clogging of the tip of the fuel nozzle 11.

[0011]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have ejected air laterally to the liquid fuel ejected from a fuel nozzle to atomize the liquid fuel. It has been found that the above problems can be solved by scattering with the above, and the present invention has been accomplished.

According to the first aspect of the present invention, the fuel nozzle and the liquid fuel jetted and supplied by the fuel nozzle are vaporized inside, and the vaporized gas and combustion air are premixed and supplied to the combustion section. In a liquid fuel combustion apparatus including a carburetor for cooling, an air nozzle section for supplying combustion air provided on the peripheral wall of the carburetor, and a blower for sending combustion air to the air nozzle section, the fuel is jetted and supplied from the fuel nozzle. The liquid fuel combustor is characterized in that air is jetted laterally to the liquid fuel from an air supply pipe provided on the peripheral wall of the vaporizer to atomize the liquid fuel and scatter it.

The invention according to claim 2 of the present invention is characterized in that, in the liquid fuel combustion apparatus according to claim 1, the primary air is branched and supplied from the air supply pipe line.

According to a third aspect of the present invention, in the liquid fuel combustion apparatus according to the first or second aspect, air from an air supply device such as an air pump or a fan is supplied from the air supply pipe line. Is characterized by.

According to a fourth aspect of the present invention, in the liquid fuel combustion apparatus according to the first to third aspects, a part of the air ejected from the air supply pipe is applied near the tip of the fuel nozzle. Characterize.

[0016]

According to the present invention, the liquid fuel jetted and supplied from the fuel nozzle is atomized and scattered by the combustion air jetted from the air nozzle portion into the vaporization chamber, and further further jetted by the air jetted laterally. Form,
Moreover, the collision surface of the ejected finely divided liquid fuel has a wide area. As described above, the atomization of the liquid fuel is improved and the vaporization surface can be made larger, so that all the liquid fuel ejected from the fuel nozzle is instantly vaporized, and as shown in the conventional example, it is unstable due to the vaporization time delay. It is possible to carry out stable combustion without any unnecessary combustion, and there is no problem that tar is generated or accumulated at the bottom of the vaporization chamber.

The ratio of the cross-sectional area of the outlet of the air supply conduit to the cross-sectional area of the air nozzle from which combustion air is jetted, the amount and speed of air jetted from the lateral direction of the liquid fuel jetted and supplied into the vaporization chamber, or The various conditions such as the angle with respect to the jetted liquid fuel are appropriately determined so that the liquid fuel can be finely atomized, the vaporization surface can be large, and stable combustion can be performed, and is not particularly limited.

Specifically, for example, in the vaporization chamber, the ratio of the cross-sectional area of the outlet of the air supply conduit to the cross-sectional area of the air nozzle from which the combustion air is ejected is in the range of about 1: 1 to 2. Air is jetted from a direction substantially perpendicular to the liquid fuel to be jetted and supplied, and the ratio of the amount of air and the amount of combustion air is in the range of about 1: 1 to 2 The ratio to the velocity of air may be in the range of about 1: 1 to 2, and combinations thereof may be mentioned.

A proper angle may be selected so that the liquid fuel atomized by laterally ejecting air to the liquid fuel jetted and supplied from the fuel nozzle comes into contact with the higher temperature vaporization surface of the vaporization chamber. This is preferable because the vaporization of the liquid fuel can be further promoted.

Since the fuel nozzle is cooled by the air and the combustion air which are jetted from the lateral direction of the liquid fuel jetted and supplied into the vaporization chamber, the temperature of the fuel nozzle is lowered. Therefore, after the combustion is stopped, the remaining fuel is suppressed from entering the vaporization chamber, and the generation of odor can be prevented. Further, since the temperature of the fuel nozzle is lowered, it is possible to prevent the fuel remaining in the fuel nozzle from tarring and clogging the tip portion.

By splitting the primary air and supplying it from the air supply pipe, it becomes easy to set the above-mentioned various conditions, and it is possible to easily and economically use the present invention without drastically changing the conventional device. The invention may be implemented.

By supplying air from an air supply device such as an air pump or a fan from the air supply conduit, various conditions such as the amount and speed of the air or the angle with respect to the jetted liquid fuel are controlled within an optimum range. In addition, the present invention can be implemented easily and economically without significantly changing the conventional device.

By positively applying a part of the air ejected from the air supply pipe to the vicinity of the tip of the fuel nozzle, the temperature of the fuel nozzle is further lowered. Therefore, after the combustion is stopped, the residual fuel remains in the vaporization chamber. Outflow is suppressed and odor can be prevented. Further, since the temperature of the fuel nozzle is further lowered, it is possible to prevent the fuel remaining in the fuel nozzle from tarring and clogging the tip portion.

[0024]

EXAMPLES The contents of the present invention will be described more specifically below with reference to FIGS. 1 and 2, but the present invention is not limited to these contents. FIG. 1 is an explanatory diagram showing a main part of a liquid fuel combustion apparatus according to a first embodiment of the present invention. 1 (1) is a plan view for explaining a part of the plane of the liquid fuel combustion apparatus as a cross section, and FIG. 1 (2) is a side view for explaining a part of the side surface of the liquid fuel combustion apparatus as a cross section. It is a figure. 1a is a vaporizer, 2 is a peripheral wall of the vaporizer 1a, and 4
Is an elbow-type primary air pipe for flowing primary air for combustion,
One end of the primary air pipe 4 communicates with a blower (not shown) via a connecting pipe (not shown). The carburetor 1 is laterally arranged with respect to the liquid fuel jetted and supplied from the fuel nozzle 11 having its tip facing the vaporization chamber 10 inside the vaporizer 1a.
A part of the primary air is branched and ejected from the air supply conduit 30 provided on the peripheral wall 2 of a.

One end 30a of the air supply pipe 30 is connected to the primary air pipe 4 and serves as an air inlet for diverting the primary air into the air inlet. The other end 30b of the air supply conduit 30 is an air outlet connected to the peripheral wall 2 near the fuel nozzle 11 of the carburetor 1a. The air that has flowed in from the air inlet 30a passes through the air supply conduit 30 and from the air outlet 30b.
It is designed to squirt to 0.

Reference numeral 13 is a diaphragm plate, and a burner head 14 is fitted and mounted in the upper opening of the carburetor 1a on the diaphragm plate 13. A wire mesh (not shown) is attached to both the inner and outer surfaces of the peripheral wall of the burner head 14, and a large number of flame holes 16 are formed. Reference numeral 17 is a flame holding plate provided at the upper end of the vaporizer 1a, and 25 is a baffle plate.

In the above structure, when the vaporizer 1a is heated to a predetermined temperature by energizing the heater 3, a blower (not shown) and a pump (not shown) are activated, and liquid fuel is fed from the tip of the fuel nozzle 11 to the vaporization chamber 10. Spouted,
The air flowing in from the air inlet 30a is supplied to the air supply conduit 30.
Through the air outlet 30b to be jetted laterally to the liquid fuel into the vaporization chamber 10, and the primary air for combustion is also supplied from the primary air pipe 4 via the air nozzle portion 22 to the vaporization chamber 10.
Is supplied in.

The liquid fuel ejected from the tip of the fuel nozzle 11 into the vaporization chamber 10 is supplied from the air nozzle portion 22 to the vaporization chamber 10.
In addition to being scattered by the combustion air that is jetted inside into fine particles, the air that is jetted into the vaporization chamber 10 from the lateral direction with respect to the liquid fuel is further made into fine particles and scattered, and is jetted as shown by arrow b. The collision surface of the atomized liquid fuel becomes larger and comes into contact with the vaporization surface of the vaporization chamber 10.
Since the liquid fuel is atomized and the vaporization surface is large, all the liquid fuel ejected from the fuel nozzle 11 is instantly vaporized, and the vaporized gas is mixed with the primary air for combustion,
This mixed gas enters the burner head 14 through the passage of the diaphragm plate 13 and is ejected from the flame holes 16 so that stable combustion can be performed.

Since all the liquid fuel ejected from the fuel nozzle 11 is instantly vaporized, unstable combustion due to the time delay of vaporization is eliminated, and there is no problem that tar is generated or accumulated at the bottom of the vaporization chamber. The fuel nozzle 11 is cooled by the air and the combustion air that are jetted from the lateral direction of the liquid fuel jetted and supplied into the vaporization chamber 10, and the temperature of the fuel nozzle 11 is lowered. Therefore, after the combustion is stopped, the remaining fuel is suppressed from flowing into the vaporization chamber 10, and the generation of odor can be prevented. Further, since the temperature of the fuel nozzle 11 decreases, the fuel remaining in the fuel nozzle 11 is tarned and the fuel nozzle 11
It is possible to prevent clogging of the tip of the.

FIG. 2 is an explanatory view showing a main part of a liquid fuel combustion apparatus according to the second embodiment of the present invention. Figure 1 (1)
FIG. 3 is a plan view illustrating a part of a plane of the liquid fuel combustion apparatus in section, and FIG. 2B is a side view illustrating a part of a side surface of the liquid fuel combustion apparatus in section. 1b is a carburetor, 2 is a peripheral wall of the carburetor 1b, 4 is an elbow-type primary air pipe through which primary air for combustion flows, and this primary air pipe 4
Has one end connected to a blower (not shown) through a communication pipe (not shown). The air supplied from the air pump Pa is provided on the peripheral wall 2 of the carburetor 1b in the lateral direction with respect to the liquid fuel jetted and supplied from the fuel nozzle 11 whose tip faces the vaporization chamber 10 inside the carburetor 1b. It is designed to eject through the supply conduit 31.

One end (not shown) of the air supply conduit 31 is connected to the air pump Pa. The other end 31b of the air supply conduit 31 is an air outlet connected to the peripheral wall 2 near the fuel nozzle 11 of the carburetor 1b. The air supplied from the air pump Pa passes through the air supply conduit 31 and the air outlet 31.
It is designed to eject from b to the vaporization chamber 10.

Reference numeral 13 is a diaphragm plate, and a burner head 14 is fitted and mounted in the upper opening of the carburetor 1b on the diaphragm plate 13. A wire mesh (not shown) is attached to both inner and outer surfaces of the peripheral wall of the burner head 14, and a large number of flame holes 16 are formed. Reference numeral 17 is a flame holding plate provided at the upper end of the vaporizer 1b, and 25 is a baffle plate.

In the above structure, when the carburetor 1b is heated to a predetermined temperature by energizing the heater 3, a blower (not shown) and a pump (not shown) are activated, and liquid fuel is fed from the tip of the fuel nozzle 11 to the vaporization chamber 10. Spouted,
The air supplied from the air pump Pa is the air supply conduit 3
1 through the air outlet 31b, and is jetted laterally to the liquid fuel into the vaporization chamber 10, and the primary air for combustion is discharged from the primary air pipe 4 through the air nozzle portion 22.
0 is supplied.

The liquid fuel ejected from the tip of the fuel nozzle 11 into the vaporization chamber 10 is supplied from the air nozzle portion 22 to the vaporization chamber 10.
The particles are scattered by the combustion air ejected inside to become fine particles, and are further scattered by the air ejected from the lateral direction to the liquid fuel into the vaporization chamber 10 to become fine particles, which are ejected as shown by arrow c. The collision surface of the vaporized liquid fuel becomes large and comes into contact with the vaporization surface of the vaporization chamber 10. Since the liquid fuel is atomized and a large vaporization surface can be taken, all the liquid fuel ejected from the fuel nozzle 11 is instantly vaporized and the vaporized gas is mixed with the primary air for combustion. Can enter the burner head 14 through the passage of (1), and can be ejected from the flame holes 16 to perform stable combustion.

Since all the liquid fuel ejected from the fuel nozzle 11 is instantly vaporized, unstable combustion due to the time delay of vaporization is eliminated, and there is no problem that tar is generated or accumulated at the bottom of the vaporization chamber. The fuel nozzle 11 is cooled by the air and the combustion air that are jetted from the lateral direction of the liquid fuel jetted and supplied into the vaporization chamber 10, and the temperature of the fuel nozzle 11 is lowered. Therefore, after the combustion is stopped, the remaining fuel is suppressed from flowing into the vaporization chamber 10, and the generation of odor can be prevented. Further, since the temperature of the fuel nozzle 11 decreases, the fuel remaining in the fuel nozzle 11 is tarned and the fuel nozzle 11
It is possible to prevent clogging of the tip of the.

[0036]

Since the present invention is constructed as described above, the liquid fuel jetted and supplied from the fuel nozzle is atomized by the combustion air jetted from the air nozzle portion into the vaporization chamber and jetted laterally. The generated air is further atomized and scattered, and a large collision surface for vaporizing the liquid fuel can be taken. Therefore, all the liquid fuel is instantly vaporized, and unstable combustion due to vaporization delay of a part of the liquid fuel can be eliminated and stable combustion can be performed, so that tar is generated or accumulated at the bottom of the vaporization chamber. Can be suppressed.

Since the fuel nozzle is cooled and the temperature of the fuel nozzle is lowered by the air and the combustion air which are jetted from the lateral direction of the liquid fuel jetted and supplied into the vaporization chamber, the fuel remaining after the combustion is stopped is the fuel nozzle. It is possible to prevent the generation of odors from being discharged into the vaporization chamber. Further, since the temperature of the fuel nozzle is lowered, it is possible to prevent the fuel remaining in the fuel nozzle from tarring and clogging the tip portion. INDUSTRIAL APPLICABILITY The liquid fuel combustion apparatus of the present invention is economical because it has a simple structure, and is highly effective, so that it has high industrial utility value.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a liquid fuel combustion apparatus showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts of a liquid fuel combustion apparatus showing another embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a conventional liquid fuel combustion device.

FIG. 4 is a cross-sectional view of a main part of a conventional liquid fuel combustion device.

[Explanation of symbols]

 Pa Air pump 1, 1a, 1b Vaporizer 2 Circumferential wall 3 Heating heater 4 Primary air pipe 5 Connection pipe 6 Blower 7 Liquid fuel supply pipe 8 Pump 9 Fuel tank 10 Vaporizing chamber 11 Fuel nozzle 12 Cartridge tank 13 Throttling plate 14 Burner head 15 Wire mesh 16 Flame Holes 17 Flame Retaining Plate 18 Burner Case 19 Secondary Air Pipe 20 Combustion Cylinder 21 Air Passage 22 Air Nozzle 23 Ignition Electrode 24 Frame Rod 25 Baffle Plate 30, 31 Air Supply Pipeline 30a Air Inlet 30b, 31b Air Outlet

Claims (4)

[Claims] 1. A fuel nozzle, a vaporizer for vaporizing the liquid fuel jetted and supplied by the fuel nozzle inside, premixing the vaporized gas and combustion air and supplying the vaporized gas to a combustion section, and a vaporizer for the vaporizer. In a liquid fuel combustion apparatus including an air nozzle section for supplying combustion air provided on a peripheral wall and a blower for sending combustion air to the air nozzle section, in a lateral direction with respect to liquid fuel jetted and supplied from a fuel nozzle. From the above, the liquid fuel combustion apparatus is characterized in that air is jetted from the air supply pipe provided on the peripheral wall of the carburetor to atomize the liquid fuel and scatter it. 2. The liquid fuel combustion apparatus according to claim 1, wherein the primary air is branched and supplied from the air supply pipe line. 3. The liquid fuel combustion apparatus according to claim 1, wherein air from an air supply device such as an air pump or a fan is supplied from the air supply pipe line. 4. The liquid fuel combustion apparatus according to claim 1, wherein a part of the air ejected from the air supply pipe is applied to the vicinity of the tip of the fuel nozzle.