JPH0484005A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To evaporate and vaporize the liquid fuel at a relatively low temperature and supplying it to combustion by arranging a porous body in an evaporation chamber and supplying liquid fuel to the porous body and blowing heated air in order to evaporate and vaporize the liquid fuel by the heated air that is passing through the porous material. CONSTITUTION:A porous body 11 is arranged in an evaporation chamber 10, and heated air that is sent passes for sure the porous body 11 and the air that is sent by a blower fan is heated as it passes through a heater 21 and becomes high temperature air and is sent to the evaporation chamber 10. On the side downstream of the evaporation chamber 10 a combustion section 50 which communicates with the chamber 10 is provided, and the void ratio of the porous body 11 is made relatively high and by using the porous body that has a good communication between the surface and the inside voids supplied heated air A flows smoothly in the porous body 11. On the other hand liquid fuel L descends from top to bottom in the porous body 11 along the voids. The liquid fuel in the state of membrane is heated directly by the heated air, and it is evaporated and vaporized at relatively low temperature, and becomes a mixture gas and goes out of the porous body 11 and is sent to the combustion section 50 to become fuel.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a fuel combustion device in which liquid fuel such as petroleum is directly evaporated and vaporized at a relatively low temperature using heated air, and is then combusted. Regarding.

<Prior Art> The present applicant has already disclosed in Japanese Patent Application No. 1-302965, etc., an apparatus for supplying liquid fuel into heated air, evaporating it directly at a relatively low temperature, and combusting it. A device using an airless jet nozzle was used. This device is shown in Figure 6 (A).
This will be explained using (B). FIG. 6(A) is an overall configuration diagram of a conventional device, and FIG. 6(B) is a sectional view taken along line DD in FIG. 6(A). Air is taken in by a fan 1 and sent through a supply path 2 into an evaporation chamber 3. 4 is an electric heater for heating the air midway. On the other hand, liquid fuel such as petroleum is ejected into the evaporation chamber 3 in an atomized state through the ejection nozzle 5 . Then, the liquid fuel atomized in the evaporation chamber 3 is brought into direct contact with the heated air, evaporates and vaporized, becomes a mixture with air, and is sent to the combustion section 6 for combustion.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional technology, the jet nozzle 5 is used and the liquid fuel is atomized using high pressure, so the opening at the tip of the nozzle 5 becomes very small, and foreign matter such as dust can be removed. A nozzle with a small flow rate (1 liter/hour, or less) to avoid clogging due to this problem has the disadvantage that it cannot be used practically.

Further, even if an attempt is made to change the spray flow rate by changing the pressure applied to the injection nozzle 5, there is a drawback that a large aperture ratio (T, D, R) cannot be achieved because the flow rate is the square of the pressure.

Furthermore, when spraying with the injection nozzle 5, the spray spreads at a certain angle, tends to hit the inner wall surface of the evaporation chamber 3, and has the disadvantage that it tends to condense on the wall surface.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid fuel combustion device that can eliminate the drawbacks of the conventional devices described above, and that can directly evaporate liquid fuel at a relatively low temperature and use it for combustion.

<Means for Solving the Problems> In order to achieve the above object, the liquid fuel combustion device of the present invention has a liquid fuel supply means, a heated air blowing means,
Liquid fuel is directly evaporated with heated air in the evaporation chamber,
A liquid fuel combustion device configured to send the obtained air-fuel mixture to a combustion section for combustion, wherein a porous body is disposed within the evaporation chamber, the liquid fuel is supplied to the porous body, and the liquid fuel is supplied to the porous body. The heated air is blown through the porous body, and the liquid fuel falling inside the porous body is directly evaporated and vaporized by the heated air passing through the porous body.

Effect> According to the features of the present invention described above, the liquid fuel supplied to the porous body within the evaporation chamber descends along the voids within the porous body. The heated air also blows through the voids within the porous body. At that time, the liquid fuel in the form of a film is directly evaporated and vaporized by the heated air at a relatively low temperature, exits the porous body together with the heated air, and is sent to the combustion section as an air-fuel mixture.

Since a porous body is used instead of the injection nozzle, there is no risk of fuel clogging. Furthermore, the throttle ratio can be varied widely from large flow rates to small flow rates. Further, since the liquid is not sprayed at a fixed angle as in the case of an injection nozzle, condensation of the evaporated fuel on the inner wall of the evaporation chamber is also reduced.

<Example> FIG. 1 is an overall configuration diagram of an apparatus for implementing the present invention, FIG. 2 is an enlarged inventive diagram of a porous body portion, and FIG. 3 is a plan view of the apparatus for implementing the present invention.

A porous body 11 is arranged in the evaporation chamber 10 so that the heated air that is sent always passes through the porous body 11. In other words, air sent by a blower fan (not shown) is supplied to the heater 21.
The air is heated as it passes through the air, becomes high-temperature air, and is sent to the evaporation chamber 10.

For the porous body 11, an oil level regulator 31 and an oil pipe 3 are connected.
Liquid fuel is supplied to the upper end surface portion of the porous body 11 by a liquid fuel supply means consisting of a fuel pump 2 and an oil feed pump 33.

The liquid fuel falls downward through the porous body 11 by gravity along the voids. The unevaporated fuel at the lower end of the porous body 11 that is not evaporated midway through the porous body 11 reaches a portion 41 and is returned to the oil level regulator 31 through the recovery pipe 42 .

A combustion section 50 is provided in communication with the downstream side of the evaporation chamber IO.

By making the porous body 11 relatively high in porosity and having good communication between the surface and the internal voids, the supplied heated air A flows smoothly inside the porous body 11. On the other hand, the liquid fuel descends from the top to the bottom of the porous body 11 along the voids. At that time, the liquid fuel in the form of a film is directly heated by the heated air, evaporates and vaporizes at a relatively low temperature, becomes an air-fuel mixture, exits the porous body 11, is sent to the combustion section 50, and is combusted. be given

The amount of air-fuel mixture supplied to the combustion section 50 can be controlled by changing the flow rate of the oil pump 33 and by adjusting the strength of the heater 21 and the blower fan (not shown), which are means for supplying heated air. By using the porous body 11 in place of a conventional injection nozzle, it has become possible to supply liquid fuel with a large throttle ratio without clogging the nozzle even at a small flow rate (11!/hour or less).

In addition, since the liquid fuel is heated and evaporated with heated air instead of heating the porous body 11 itself, the liquid fuel evaporates at a relatively low temperature, and tar-like substances are generated and the porous body 11 is made of tar-like substances. This avoids the risk of adhesion and blockage.

In addition, when using an injection nozzle, the spray spreads at a certain angle, making it easier to collide with the inner wall of the evaporation chamber.
When the porous body 11 is used, the fuel remains in liquid form and does not touch anything other than the porous body 11. Therefore, porous body 1
Members can be freely laid out except for one arrangement section.

3 and 4 respectively show other embodiments in which the layout is changed from that in FIG. 1. Members and elements having the same functions and actions are designated by the same reference numerals as those explained in FIG. 1, and their explanations are omitted, but the actions and effects are also the same as in FIG. 1.

FIG. 5 shows yet another embodiment. In this embodiment, a porous body 11 is arranged in an annular shape in an evaporation chamber 10, and heated air is passed from the outer circumferential side of the porous body 11 to the inner circumferential side.
The liquid fuel is evaporated. Other points are similar to the embodiments already described. The same members and elements as those in the previously described embodiments are given the same reference numerals.

Effects> The present invention has the above configuration, and according to the liquid fuel combustion apparatus according to claim 1, since the porous body is used to increase the contact area between the liquid fuel and the heated air, the liquid fuel Similar to the case where fuel is atomized and supplied, it is possible to directly evaporate the fuel at a relatively low temperature. Therefore, less tar is generated and energy is saved. Furthermore, by using a porous material in particular, it has become possible to supply liquid fuel from large flow rates to small flow rates without clogging and with a large throttle ratio, making it easy to adjust the combustion power.

Furthermore, by using a porous body, it was possible to increase the degree of freedom in the layout of each part of the device compared to the case where a spray nozzle was used.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an apparatus for implementing the present invention, FIG. 2 is an enlarged explanatory diagram of a porous body portion, FIGS. 3 and 4 are overall configuration diagrams of other implementation apparatuses, and FIG. Figure 6 (A) is an overall configuration diagram of a conventional device;
Figure (B) is a sectional view taken along line DD in Figure 6 (8). 10: Evaporation chamber 11: Porous body 21: Heater 31: Oil level regulator 32: Oil feed pipe 33: Oil feed pump 41: Unevaporated fuel cost part 42: Recovery pipe 50: Combustion part

Claims (1)

[Claims] (1) It has a liquid fuel supply means and a heated air blowing means, and is configured to directly evaporate and vaporize the liquid fuel with heated air in the evaporation chamber and send the obtained air-fuel mixture to the combustion section for combustion. In the liquid fuel combustion device, a porous body is arranged in the evaporation chamber, and the liquid fuel is supplied to the porous body and the heated air is blown so as to pass through the porous body. . A liquid fuel combustion device, characterized in that the liquid fuel descending within the porous body is directly vaporized by heated air passing through the porous body.