JPH04324009A - Liquid fuel evaporator - Google Patents

Abstract

PURPOSE:To provide a liquid fuel evaporator wherein liquid fuel sprayed into an evaporation chamber enters the evaporation chamber sufficiently, and the liquid fuel can be evaporated sufficiently and stably in the compact evaporation chamber. CONSTITUTION:A liquid fuel evaporator is provided at least with a cylindrical evaporation container 10 consisting of an outer cylinder 11 and both end walls, a nozzle for spraying atomized liquid fuel from the end wall on one side of the evaporation container 10 into an evaporation container 13, and a high- temperature air feed means for feeding high-temperature air into the evaporation container 13. In this liquid fuel evaporator, the atomized liquid fuel sprayed into the above-described evaporation container 13 is directly evaporated by contact with the high-temperature air, and the mixed gas thus obtained is so arranged as to be fed to a burner side. Further, a plurality of high-temperature air introducing ports 15 are provided uniformly in the peripheral area of the outer cylinder 11 of the evaporation container.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a method for using liquid fuel such as kerosene,
The present invention relates to a liquid fuel evaporation device that directly evaporates and vaporizes air at a relatively low temperature using heated air and sends the resulting mixture to a combustor.

0002

[Prior Art] Fig. 6 shows a conventional example of this type of liquid fuel evaporation device.
, shown in FIG. FIG. 6 is a partially sectional front view of a conventional device, and FIG. 7 is a partially sectional side view of the same. An evaporation chamber 2 is configured in a cylindrical evaporation container 1, and a nozzle 3 for spraying liquid fuel is provided.
is placed on the central axis of the cylindrical evaporation container 1 and faces into the evaporation chamber 2 inside. The liquid fuel is sent to the nozzle 3 and introduced into the evaporation chamber 2 in an atomized state. The evaporation vessel 1 is provided with one high-temperature air inlet 7 in the tangential direction on the cylindrical wall surface near the end wall facing the injection port of the nozzle 3, and the high-temperature air introduced from the inlet 7 , the liquid fuel sprayed into the evaporation chamber 2 is directly vaporized at a relatively low temperature. The obtained air-fuel mixture is sent to a combustor 9 from a delivery port 8 provided on the cylindrical wall near the injection port, and is subjected to combustion.

0003

However, in the above-mentioned conventional liquid fuel evaporation device, the evaporation chamber 2 is constructed within the evaporation container 1 consisting of a cylindrical outer tube and disk-shaped both end walls, and the nozzle 3 is located at either end. The high-temperature air feeding means is located on the side opposite to the nozzle 3 position, and its feeding pipe is tangentially connected to the one high-temperature air inlet 7. In addition, since the air-fuel mixture sending pipe from the evaporation chamber 2 to the combustor 9 side is connected tangentially to the outer cylinder, the flow of the introduced high-temperature air is prevented from being eccentric within the evaporation container. The liquid fuel tends to form a spiral shape, so that the liquid fuel sprayed into the evaporation chamber 2 is bent in a specific direction (the spray cone is eccentric) and collides with the outer cylinder of the evaporation chamber 2. This phenomenon becomes particularly noticeable when the degree of penetration (momentum) of the sprayed liquid fuel is low. Therefore, actual evaporation occurs only in the space until the sprayed liquid fuel collides with the outer cylinder of the evaporation chamber 2, which has the disadvantage that the evaporation chamber 2 is not used effectively. Furthermore, since the spray does not spread sufficiently and comes into contact with the high temperature air, there is a drawback that the spray particles and the high temperature air are not sufficiently mixed.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and the liquid fuel sprayed into the evaporation chamber sufficiently enters the evaporation chamber, and the liquid fuel can be efficiently and stably evaporated in the compact evaporation chamber. The purpose is to provide fuel evaporation equipment.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the liquid fuel evaporation device of the present invention includes a cylindrical evaporation container consisting of an outer cylinder and both end walls, and an interior of the evaporation container from one side end wall of the evaporation container. the atomized liquid fuel sprayed into the evaporation container, the atomized liquid fuel sprayed into the evaporation container is directly contacted with the high temperature air; This liquid fuel evaporator is configured to evaporate the air-fuel mixture and send the mixture to the combustor side, characterized in that a plurality of high-temperature air inlets are evenly provided in the circumferential area of the outer cylinder of the evaporator container. It is said that

[0006]

[Operation] Since high-temperature air is introduced from multiple high-temperature air inlets evenly provided in the circumferential area of the outer cylinder of the evaporation container, the distribution of high-temperature air flow is better than when high-temperature air is introduced from one place. is uniform, and there is no force that bends the spray in a specific direction. Therefore, the liquid fuel particles sprayed from the nozzle can easily penetrate deeply into the container and come into contact with the high temperature air over a wide range and for a suitable contact time. As a result, efficient and stable evaporation can be performed. In addition, the space utilization rate is good, so the evaporation chamber can be made smaller.
The device can be made more compact.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially sectional front view of an apparatus according to a first embodiment of the present invention, and FIG. 2 is a partially sectional side view of the same.

The evaporation container 10 consists of a cylindrical outer tube 11 and disk-shaped end walls 12 and 28, and defines an evaporation chamber 13 inside. A nozzle structure 23 having a nozzle 22 facing into the container 10 is attached to one end wall 12 of the evaporation container 10 on the central axis. Also, evaporation container 1
0 outer cylinder 11 has a delivery port 1 closer to the nozzle structure 23 that sends the evaporated liquid fuel to the combustor 25.
4 is provided. On the other hand, a high-temperature air chamber 20 having a constant width is provided in a circumferential region of the outer cylinder 10 farther from the nozzle structure 23. A plurality of high temperature air inlets 15 are provided evenly in the circumferential direction on the inner circumferential wall 17 of the high temperature air chamber 20. Further, the outer peripheral wall 18 of the high temperature air chamber 20
A pipe 26 from an air heating means 27, which is a high-temperature air generating device, is connected to. The air heating means 27, the pipe 26, the high temperature air chamber 20, and the high temperature air inlet 15 constitute a high temperature air feeding means.

In this embodiment, a plurality of high temperature air inlets 15 from the high temperature air chamber 20 to the evaporation chamber 13 are connected to the evaporation chamber 13.
Air is introduced in the tangential direction. In this embodiment, high-temperature air is uniformly introduced from the plurality of high-temperature air inlets 15 of the high-temperature air chamber 20 provided in the circumferential area of the outer cylinder 11 of the evaporation container. In comparison, the distribution of the high-temperature air flow is uniform, and no force acts to bend the spray in a particular direction. Therefore, nozzle 2
The liquid fuel particles sprayed from 2 can easily penetrate deeply into the container 10, and can come into contact with the high temperature air over a wide range and with a suitable contact time. Furthermore, in this embodiment, by introducing high temperature air in the tangential direction from the high temperature air inlet 15, it is possible to generate a flow of high temperature air along the inner wall surface of the evaporation chamber 13, and as a result, the atomized fuel is It is possible to prevent the evaporated fuel from coming into contact with the inner wall surface immediately after spraying, and to prevent the evaporated fuel from coming into contact with the still-low-temperature wall surface and re-liquefying the fuel, especially at the beginning of operation.

FIG. 3 is a partially sectional front view of an apparatus according to a second embodiment of the present invention. In the case of the second embodiment, a plurality of high-temperature air inlets 15 evenly provided on the inner wall 17 of the high-temperature air chamber 20 are arranged at an angle smaller than the tangential direction (in the case of the first embodiment) with respect to the evaporation chamber 13. a, for example, at 45 degrees with respect to the radial direction. The other points are the same configuration as the first embodiment.

In the case of the first embodiment, since the high-temperature air inlet 15 is provided in the tangential direction to the evaporation chamber 13, the high-temperature air introduced becomes a swirling air flow along the inner wall surface of the evaporation chamber 13. Therefore, the disadvantage is that there is a large amount of heat dissipated from high-temperature air to the wall.
Also, there was a problem that the mixing of the high temperature air and the sprayed fuel was slow, and it took a long time for evaporation. In the second embodiment, a swirling airflow of high-temperature air is formed away from the inner wall surface of the evaporation chamber 13 (
(The radius of the swirling airflow becomes smaller), so less heat is radiated to the wall, resulting in energy savings. Furthermore, the high temperature air and the sprayed fuel are mixed more quickly than in the first embodiment, and the evaporation efficiency is further improved. Of course, the effect obtained by providing a plurality of high-temperature air introduction chambers 15 evenly around the circumferential area of the container outer cylinder 11 is the same as that of the first embodiment.

FIG. 4 is a partially sectional front view of an apparatus according to a third embodiment of the present invention. In the case of the third embodiment, a plurality of high-temperature air inlets 15 are provided evenly on the inner wall 17 of the high-temperature air chamber 20 in a radial direction with respect to the evaporation chamber 13. Other points are the same as in the first and second embodiments. In the case of the third embodiment, high temperature air is supplied from the surroundings to the evaporation chamber 13.
It is blown inward towards its center. Therefore, a swirling flow along the wall surface is not formed, and the high temperature air blown from the side comes into direct contact with the sprayed liquid fuel, resulting in efficient evaporation. Furthermore, there is little resistance to the intrusion of the atomized liquid fuel, and good catalytic evaporation can be achieved even if a sprayer with a small spray penetration force is used.

FIG. 5 is a partially sectional side view showing a modification of each of the above embodiments of the present invention. In this modification, the nozzle 22 is provided on the end wall 28 on the side where the high temperature air inlet 15 is located. That is, in the above embodiments 1 to 3, the nozzle 22
High temperature air inlet 15 and high temperature air outlet 1 for
4 may be reversed. Others, outlet 1
4 may be provided on the central axis of the end wall on the opposite side to the nozzle 22 side.

[0014]

According to the liquid fuel evaporator according to claim 1, the present invention has the above-described structure and operation. Since high-temperature air is introduced from one place, the distribution of high-temperature air flow is more uniform than when high-temperature air is introduced from one place.
The force that bends the spray in a specific direction does not work. Therefore, the liquid fuel particles sprayed from the nozzle can easily penetrate deeply into the container and come into contact with the high temperature air over a wide range and for a suitable contact time. As a result, efficient and stable evaporation can be performed. Moreover, since the space utilization efficiency is good, the evaporation chamber can be made small, and the apparatus can be made compact.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a partially sectional side view of the device according to the first embodiment.

FIG. 3 is a partially sectional front view of an apparatus according to a second embodiment of the present invention.

FIG. 4 is a partially sectional front view of an apparatus according to a third embodiment of the present invention.

FIG. 5 is a partially sectional side view showing a modification of each of the above embodiments of the present invention.

FIG. 6 is a partially sectional front view of a conventional device.

FIG. 7 is a partially sectional side view of a conventional device.

[Explanation of symbols]

10 Evaporation container 11 Outer cylinder 12, 28 End wall 13 Evaporation chamber 14 Mixture outlet 15 High temperature air inlet 20 High temperature air chamber 22 Nozzle 25 Combustor

Claims (1)

[Claims] Claim 1: A cylindrical evaporation container consisting of an outer cylinder and both end walls, a nozzle for spraying atomized liquid fuel into the container from one end wall of the evaporation container, and a high-temperature nozzle for sending high-temperature air into the evaporation container A liquid fuel evaporator comprising at least an air feeding means, the atomized liquid fuel sprayed into the evaporator container is directly evaporated by contact with the high temperature air, and the mixture is sent to the combustor side. 1. A liquid fuel evaporation device, characterized in that a plurality of high-temperature air inlets are evenly provided in a circumferential region of the outer cylinder of the evaporation container.