JPS60200012A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To control accumulation of tar on an evaporation surface, by a method wherein fuel is evaporated while it is being turned, and a position where the fuel collides directly against the evaporation surface is shifted in the direction of turning than a position where combustion air collides directly against the evaporation surface. CONSTITUTION:Fuel is injected along with combustion air along the inner circumference of an evaporation chamber 1 from a blast pipe 4, evaporated on an evaporation surface 7 provided on an inner wall of evaporation chamber 1 while it is being turned and supplied to a combustion part 8 of the upper part for combustion while it is being mixed. In this instance, a position where the fuel collides directly against the evaporation surface 7, that is, a collision surface 9 of the fuel is kept shifted slightly in the direction of turning than a position where the combustion air collides directly against the evaporation surface 7, that is, a collision surface 10 of the air. With this construction, a partial cooling phenomenon of the evaporation surface through the fuel and the combustion air is mitigated, generation and accumulation of tar are almost eliminated and generation of a foul odor at the time of ignition, extinction and combustion and carbon monoxide are decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device for vaporization premix combustion using petroleum as fuel, which is applied to household heaters and the like.

Conventional FA Construction and Its Problems A conventional liquid fuel combustion apparatus of this type has a 471□ construction as shown in FIG. That is, a cylindrical bottomed vaporization chamber 1
A heating heater 2 is installed in the circumferential direction of the ventral surface, and a mixing plate 3 having a diaphragm shape is installed in the open surface. Further, a blower pipe 4 is connected to a part of the vaporizing chamber 1, and combustion air is sent into the vaporizing chamber 1 from the blower fan 5, and a fuel nozzle 6 is passed through the blower tube 4 and directed into the vaporizing chamber 1. ing. The fuel is vaporized together with combustion air on the vaporization surface 7 provided on the inner wall of the vaporization chamber 1, and while being mixed is supplied to a part of the combustion section 8 and combusted.

In this configuration, during steady combustion, the temperature of the vaporization surface 7 is affected by heat conduction from the heater 2 and the combustion section 8 which is the front part due to the combustion flame. However, the vicinity of the vaporization surface 1 where the fuel ejected into the vaporization chamber 1 directly collides with the vaporization surface 1, that is, the collision surface 7a, is likely to lose heat due to the direct collision of the ejected fuel and combustion air. The heat of vaporization during fuel vaporization is expressed in many words.
Was. Therefore, the temperature of this collision surface 7a tends to be lower than that of other vaporization surfaces 7, and the fuel is affected by the temperature and air and turns into tar, causing ignition due to the accumulation of cool, odor during extinguishing, and other harmful substances such as carbon oxide. There were problems with the generation of substances and the generation of toxic oxides during combustion.

OBJECTS OF THE INVENTION The present invention solves these conventional problems, and its overall purpose is to completely suppress tar accumulation on the vaporization surface and provide high-quality combustion.

Structure of the Invention In order to achieve this object, the present invention injects fuel and combustion air into the vaporization chamber along the inner circumferential vaporization surface of the vaporization chamber, vaporizes it while swirling, and causes the fuel to collide directly with the vaporization surface. The position is further in the swirling direction than the position where the combustion air directly impinges on the vaporizing surface.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a cylindrical vaporization chamber with a bottom, a heating heater 2 is installed in the circumferential direction of the ventral surface, and a mixing plate 3 having an aperture shape on the open surface is formed into foil. Furthermore, a blower pipe 4 is connected to a part of the vaporization chamber 1, from which combustion air is sent to the vaporization chamber 1 from a blower fan 5, and a fuel nozzle 6 is passed through the blower tube 4 into the vaporization chamber 1. It's set. The fuel is ejected along the inner circumference of the vaporization chamber 1 from the blast pipe 4 together with combustion air, and is vaporized on the vaporization surface 7 provided on the inner wall of the vaporization chamber 1 while swirling.
The mixture is supplied to the upper combustion section 8 and combusted.

At this time, the fuel directly collides with the vaporized ml 7 +1.
:, l, that is, the fuel collision surface 9 is the combustion air vaporization surface 7.
The position of direct impact is slightly in the direction of rotation than the four air impact surfaces 10.

With this configuration, the vaporization chamber 1 is heated by supplying electricity to the heater 2 in the vaporization chamber 1. Thereafter, combustion air is introduced into the vaporizer 41 by driving a blower fan 5 provided through the blower pipe 4 . Subsequently, the fuel is spouted from the fuel nozzle I and 6 while swirling into the vaporized space. The fuel becomes a vaporized gas through the vaporization surface 7 under the influence of temperature, passes through the throttle of the mixing plate 3 arranged in the second section, and is then transferred to the combustion section 8.
flows out to At this time, the fuel vaporized gas is mixed with combustion air to form a combustion flame in the combustion section 8 as a mixed vaporized gas.

At this time, the fuel is vaporized on the vaporization surface 7, but the fuel impingement surface 9, where the fuel directly collides with the vaporization surface 7, is slightly tilted in the swirling direction relative to the air impingement surface 10, where the combustion air directly collides with the vaporization surface 7. Because of this, the local cooling phenomenon of the vaporization surface 7 is alleviated, and the generation and accumulation of tar on the vaporization surface 7 is significantly reduced, and the fuel ejected to the fuel collision surface 9 is caused by the swirling flow caused by the combustion air. , all of the fuel was dispersed in the direction of rotation, and the vaporization form of the fuel became stable, with no fluctuations in vaporization.

Here, the flow of fuel and combustion air will be explained in detail in comparison with the conventional example. In the conventional example, as shown in FIG. 3, the fuel and combustion air injected into the vaporization chamber 1 almost directly collide with the vaporization surface 7. For this reason, the collision surface 7a is susceptible to the significant cooling effect of the fuel and combustion air, making it easy for tar to form and accumulate.

Furthermore, after colliding with the collision surface 7a, most of the fuel and combustion air are scattered in the direction of the swirling flow, but since the fuel and combustion air are also scattered in other directions, there are A flow opposite to the swirling flow occurs, and the fuel scattered in this counter-swirling flow is not sufficiently dispersed and recondenses, becoming large particles and accumulating in the vaporization ffi]7.41, causing turbulence in vaporization. This was a contributing factor. However, as shown in FIG. 4, according to this embodiment, the fuel and combustion air ejected into the vaporization chamber 1 collide directly with the fuel impingement surface 9 and the air impingement surface 10, respectively. Cooling is relaxed, the difference in warm distribution across the vaporization surface 7 is reduced, and tar generation and accumulation are significantly reduced. 1, the fuel injected into the fuel collision 19 is completely dispersed in the swirling direction due to the swirling flow caused by air and is vaporized, so the vaporization form of the fuel is stabilized and the variation UJ of vaporization is eliminated. Furthermore, by directing the jetting direction of the combustion air downward than the jetting direction of the fuel, the vaporization action of the fuel in the bottom portion of the vaporization chamber 1 can be promoted, and more stable vaporization can be obtained.

Effects of the Invention According to the liquid fuel combustion device of the present invention, the fuel and combustion air are ejected along the inner circumferential vaporization surface of the vaporization chamber, vaporized while swirling, and the fuel directly collides with the vaporization 1-(ri). By locating the combustion air in the swirling direction rather than the position where the combustion air directly impinges on the vaporizing surface, the following effects can be obtained.

(1) The local cooling phenomenon caused by the fuel and combustion air on the vaporizing surface is alleviated, and the entire vaporizing surface effectively works to vaporize the fuel in a low temperature range without being cooled by the influence of air. By doing so, the formation and accumulation of tar at 1 meter of vaporization is completely eliminated, and the generation of toxic substances such as fire, extinguishing, and combustion odors and carbon oxides is significantly reduced.

(2) By keeping the scattering direction of the fuel constant, the fuel will no longer aggregate into large particles and stay on the vaporization surface, which will stabilize the vaporization form of the fuel and eliminate fluctuations in vaporization. The generation of carbon monoxide due to combustion flame pulsations and air-fuel ratio disturbances can be prevented, and combustion characteristics can be improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional liquid fuel combustion device, Fig. 2 is a sectional view showing a liquid fuel combustion device according to an embodiment of the present invention, and Fig. 3 is a conventional liquid fuel combustion device 1'1. Figure 4 is a cross-sectional view of the vaporization chamber of an apparatus according to an embodiment of the present invention. ... Vaporization surface, 9...Fuel collision surface, 10...
...Air collision surface. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (2)

[Claims] (1) Fuel and combustion air are ejected into a cylindrical bottomed vaporization chamber equipped with a heating means along the inner circumferential vaporization surface of the vaporization chamber, vaporized while swirling, and the fuel collides directly with the vaporization surface. A liquid fuel combustion device in which the position of the combustion air is shifted in the direction of rotation from the position where the combustion air directly collides with the vaporizing surface. (2) The liquid fuel combustion device according to claim 1, wherein the direction in which the combustion air is ejected is directed downward than the direction in which the fuel is ejected.