JPH04324008A - Liquid fuel evaporator - Google Patents

Abstract

PURPOSE:To provide a liquid fuel evaporator wherein liquid fuel sprayed from a nozzle can enter an evaporation chamber sufficiently even in the case where the penetration degree of the liquid fuel sprayed is low, so that the liquid fuel can be evaporated efficiently and stably in the compact evaporation chamber. CONSTITUTION:A liquid fuel evaporator is provided at least with a cylindrical evaporation container 10, a nozzle 23 for spraying atomized liquid fuel from an end wall 12 on one side of the evaporation container 10 into said container 10, and a high-temperature air feed means 40 for feeding high-temperature air through an introducing port 15 provided on a cylindrical wall, or on an end wall, opposed to the end wall 12 where the nozzle 23 is provided. In this liquid fuel evaporator, the atomized liquid fuel sprayed into the above-described evaporation container 10 is evaporated directly by contact with the high- temperature air, and the resultant mixed gas is so arranged as to be fed to a burner 30 side. Further, an auxiliary high-temperature air outlet port B for blowing the high-temperature air from the circumferential portion of an ejection port 23a of the nozzle 23 into the evaporation container 10 is provided in addition to the introducing port 15.

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. 4 shows a conventional example of this type of liquid fuel evaporator.
, shown in FIG. FIG. 4 is a partially sectional front view of a conventional device, and FIG. 5 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 from the tank 4 to the nozzle 3 by a pump 5, and is introduced into the evaporation chamber 2 in an atomized state while the spray amount is appropriately adjusted using a cutter or the like. The sprayed fuel returns to the tank 4 through the recovery pipe 6. The evaporation vessel 1 is provided with one high-temperature air introduction port 7 in the tangential direction on the cylindrical wall near the end wall on the opposite side from the injection port of the nozzle 3. The liquid fuel sprayed into the evaporation chamber 2 is directly vaporized by the hot air at a relatively low temperature. The obtained air-fuel mixture is sent to the combustor 9 side from a delivery port 8 provided on the cylindrical wall near the injection port, and is subjected to combustion.

0003

However, in the conventional liquid fuel evaporator described above, when the degree of penetration (momentum) of the atomized particles of the nozzle 3 is low, the atomized liquid fuel does not sufficiently spread into the evaporation chamber 2. There were no drawbacks. In particular, nozzle 3
If a considerable part of the amount of fuel ejected from the evaporator is blocked by a cutter or the like, or if the nozzle 3 is an ultrasonic nozzle or the like, the degree of penetration (momentum) of the fuel sprayed from the nozzle 3 into the evaporator container 1 is small. It is pushed by a large amount of high-temperature air (having a large momentum) entering from the high-temperature air inlet 6, and does not go deep into the evaporation chamber 2. Therefore, actual evaporation occurs only in the evaporation chamber 2 near the nozzle (see FIG. 5), and in some cases, there is a drawback that the evaporation is sent out from the delivery port 8 without being evaporated. Another drawback is that the evaporation chamber 2 cannot be used effectively in such a state. On the other hand, in order to eliminate this drawback, air at high speed at room temperature is passed through nozzle 3.
It is also possible to increase the degree of penetration (momentum) of the atomized particles by the nozzle 3 by ejecting them from the surrounding area, but in this case, heat transfer to the atomized liquid fuel is performed through air at room temperature. , it takes a long time to evaporate.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and even when the penetration degree of the liquid fuel sprayed from the nozzle is low, the sprayed fuel can sufficiently enter the evaporation chamber, making it efficient and stable. The purpose of the present invention is to provide a liquid fuel evaporation device that can perform evaporation using a compact evaporation chamber.

[0005]

[Means for Solving the Problems] In order to achieve the above object, a liquid fuel evaporation device of the present invention includes a cylindrical evaporation container,
A nozzle that sprays atomized liquid fuel into the container from one side end wall of the evaporation container, and high-temperature air that sends high-temperature air through an inlet provided in the cylindrical wall or end wall on the opposite side to the side where the nozzle is located. A liquid fuel evaporator having at least a feeding means, directly evaporating the atomized liquid fuel sprayed into the evaporation container by contact with the high temperature air, and sending the mixture to the combustor side. The present invention is characterized in that, in addition to the inlet, a high-temperature air auxiliary outlet is provided for blowing high-temperature air into the evaporation container from around the injection port of the nozzle.

[0006]

[Operation] High-temperature air is blown out from the high-temperature air auxiliary outlet around the nozzle. The liquid fuel particles sprayed from the nozzle are reinforced by the high temperature air and penetrate deeply into the evaporation chamber. Further, the liquid fuel particles sprayed from the nozzle actively contact the high temperature air immediately after being ejected, so that evaporation is promoted. As described above, the liquid fuel sprayed into the evaporation chamber is sufficiently mixed with high-temperature air, and evaporation can be performed efficiently and stably, and the apparatus can also be made compact.

[0007]

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

The evaporation container 10 is composed of a cylindrical outer tube 11 and a disc-shaped end wall 12, and has an evaporation chamber 13 inside. A nozzle structure 20 having a nozzle 23 facing into the container 10 on the central axis is attached to one end wall 12 of the evaporation container 10. Further, in the outer cylinder 11 of the evaporation container 10, a delivery port 14 is provided near the nozzle structure 20 to send out the evaporated liquid fuel to the combustor 30 side.
is provided, and a high-temperature air inlet 15 is provided on the side farther from the nozzle structure 20. 31 is a delivery pipe arranged tangentially from the delivery port 14.

The nozzle structure 20 includes a wind direction guide 2
1, a nozzle mounting tube 22 attached to the end wall 12 of the evaporation container 10, a nozzle 23 fixed within the nozzle attaching tube 22, and a movable guide 24 attached around the nozzle 23 so as to be able to move forward and backward. has. Nozzle 23
The spout 23 a is located along the central axis of the evaporation container 10 and faces into the evaporation chamber 13 . Further, liquid fuel such as kerosene is sent from a tank 70 to the nozzle 23 by a pump 71 through an oil feed pipe 72 and via a connecting fitting 73 . The movable guide 24 is provided with a spray cutter 25 at its tip. The movable guide 24 is moved by a push rod 28 and a spring 29 by a stepping motor 27 supported by the nozzle mounting tube 22 via a mounting plate 26.
It is said that it can move forward and backward freely through.

[0010] The nozzle mounting tube 22 and the movable guide 2
4 is defined as a high-temperature air passage A, and high-temperature air sent from the high-temperature air sending means 40 through the blowing pipe 62 enters the high-temperature air passage A. And this high temperature air passage A
From there, high-temperature air is ejected into the evaporation chamber 13 from around the ejection port 23a of the nozzle 23 via a high-temperature air auxiliary outlet B having a wind direction guide 21. The ejection direction is determined by the wind direction guide 21 from the ejection port 23a through which the liquid fuel is ejected.
It is directed diagonally inward from the periphery toward the central axis direction of the evaporation container 10. The liquid fuel sprayed into the evaporation chamber 13 from the nozzle 23 reaches deep into the evaporation chamber 13 on the high temperature air blown out from the high temperature air auxiliary outlet B.

A portion of the liquid fuel ejected from the nozzle 23 is cut by the spray cutter 25 and returned to the tank 70 from the recovery pipe 73 through the movable guide section 24. Further, an introduction pipe 43 from the high temperature air feeding means 40 is connected to the high temperature air introduction port 15 in a tangential direction.

[0012] When the operation is started now, the advance and retreat positions of the movable guide 24 are adjusted according to the set amount of evaporation, and thereby the amount of shielding by the spray cutter 25 is adjusted, so that the required amount of liquid fuel is evaporated. A spray is supplied to the chamber 13. At the same time, high temperature air is ejected from the high temperature air auxiliary blowing means B around the nozzle 23, and the atomized fuel is carried on the airflow. On the other hand, a large amount of high-temperature air is sent into the evaporation chamber 13 from the high-temperature air inlet 15 . The liquid fuel, which has been carried sufficiently deep into the evaporation chamber 13 by the high-temperature air from the auxiliary outlet B, sufficiently contacts this large amount of high-temperature air throughout the evaporation chamber 13 and is effectively evaporated. . Note that the ratio of the high temperature air from the auxiliary outlet B to the high temperature air from the high temperature air inlet 15 for reinforcing the penetration of the spray is arbitrary depending on the size of the evaporation container 10 and the type and capacity of the nozzle 23. You can choose to.

FIG. 3 is a partially sectional front view showing another embodiment of the present invention. In this example, an ultrasonic nozzle 83 is used as the nozzle.
has been established. The ultrasonic nozzle 83 itself has a spray amount adjustment function. The provision of a high temperature air passage A and an auxiliary outlet B is the same as in the previously described embodiments. Similar members and elements are designated by the same reference numerals.

In the above embodiment, the high temperature air from the high temperature air inlet 15 is introduced in the tangential direction of the outer cylinder 11, but the high temperature air inlet 15 is connected to the opposite side from the nozzles 23 and It may be provided on the central axis of the end wall 12. In addition, the high temperature air blown into the evaporation chamber 13 from the auxiliary outlet B is directed diagonally inward toward the central axis of the evaporation chamber 10, and the direction is directed toward the central axis depending on the penetration ability of the nozzles 23, 83. Alternatively, it may be set at an arbitrary angle. Further, in the above embodiments, the shape and type of the nozzle used as the spray device are not particularly limited. For example, in the case of an air nozzle, the air used for atomization may be heated. Furthermore, when using an atomization device with extremely low spray penetration ability, high-temperature air may be introduced only from the rear of the jet nozzle.

[0015]

Effects of the Invention According to the liquid fuel evaporator according to claim 1, the present invention has the above-described structure and operation.In addition to the high-temperature air inlet, high-temperature air is supplied to the evaporator vessel from around the injection port of the nozzle. Since the auxiliary hot air outlet is provided, the atomized liquid fuel from the nozzle can be sent sufficiently deep into the evaporation chamber by the hot air from the auxiliary outlet. Moreover, since the sprayed liquid fuel comes into active contact with high-temperature air immediately after being ejected, evaporation is promoted. Therefore, even if the degree of penetration of the liquid fuel spray itself is low, it can sufficiently contact all the high temperature air throughout the evaporation chamber, and the liquid fuel can be evaporated stably and efficiently. Moreover, the evaporation container can therefore be made smaller.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of an apparatus implementing the present invention.

FIG. 2 is a partially sectional side view of the same implementation device.

FIG. 3 is a partially sectional front view of another implementation device of the present invention.

FIG. 4 is a partially sectional side view of a conventional device.

FIG. 5 is a partially sectional side view of the conventional device.

[Explanation of symbols]

10 Evaporation container 12 End wall 15 High temperature air inlet 23, 83 nozzle 30 Combustor 40 High temperature air feeding means B High temperature air auxiliary outlet

Claims (1)

[Claims] Claim 1: A cylindrical evaporation container and one of the evaporation containers.
It has at least a nozzle that sprays atomized liquid fuel into the container from a side end wall, and a high-temperature air sending means that sends high-temperature air from an inlet provided in the cylinder wall or end wall on the opposite side to the side where the nozzle is located. The liquid fuel evaporator is configured to directly evaporate the atomized liquid fuel sprayed into the evaporation container through contact with the high-temperature air and send the mixture to the combustor side, A liquid fuel evaporator characterized in that, in addition to the inlet, a high-temperature air auxiliary outlet is provided for blowing high-temperature air into the evaporator container from around the injection port of the nozzle.