JPS5821169B2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device with a set of vaporizing burners using petroleum fuel.

Conventionally, in a liquid fuel combustion device with a set of vaporizing burners, the vaporizing cabinet is used as a premixing chamber and preheated with a heater or the like, and the liquid fuel is sent by a method such as spraying or rotation to vaporize and burn.

However, conventional devices require a long preheating time and cannot perform instantaneous vaporization and combustion.

Furthermore, when preheating is performed using a heater, a large-capacity heater is required for a high-output combustion device, and this method cannot be practically applied, and is limited to relatively low-output combustion devices.

An object of the present invention is to provide a liquid fuel combustion device that instantaneously achieves blue flame vaporization combustion and can be applied to high-output combustion devices.

That is, the gist of the present invention is that an inner cylinder smaller than the outer cylinder is installed in a bottomed outer cylinder at intervals from the side surface, bottom surface, and opening surface of the outer cylinder, and the upper side surface of the outer cylinder An air supply pipe is connected to the upper part of the inner cylinder, and a fuel spray nozzle is connected to the bottom of the outer cylinder so as to face the inside of the inner cylinder.A flow adjustment plate is provided between the outer cylinder, the inner cylinder, and the gap D. , inn ).

Next, the liquid fuel combustion apparatus of the present invention will be explained with reference to the drawings.

The figure shows an example in which the combustion device is installed facing upward.

In the figure, 1 is a cabinet-shaped outer cylinder with a bottom.
An inner cylinder 2 smaller than the outer cylinder 1 is provided inside.

The inner cylinder 2 is open at both ends, and the side surface 11 and bottom surface 12 of the outer cylinder 1 are controlled by a flow regulating plate 3 that also serves as a support for the inner cylinder 2.
and is installed at a distance from the opening 13 surface.

It is preferable that the outer cylinder 1 and the inner cylinder 2 are installed concentrically so that the combustion gas can flow smoothly.

An air supply pipe 4 is connected to an upper side surface 11 of the outer cylinder 1 toward the upper side of the inner cylinder 2 .

The air inlet pipe 4 is provided horizontally or slightly upwardly toward the center of the inner cylinder 2, and the air sent from the air inlet pipe 4 passes above the upper end of the inner cylinder 2 to the outside on the opposite side. It is adapted to be soaked on the side surface 11 of the cylinder 1.

A fuel spray nozzle 5 is provided at the center of the bottom of the outer cylinder 1 so as to face upward into the inner cylinder 2.

As shown in FIG. 2, the flow regulating plate 3 is formed by a donut-shaped plate having a large number of small holes 31 bored therein.

This flow regulating plate 3 has small holes 3 on the side of the air supply pipe 4.
1 is made thicker (or the number of small holes 31 is made larger), and the aperture ratio is made larger, and on the other side, J-+L
The diameter of the holes 31 is made small, or the number of small holes 31 is made small, so that the aperture ratio is made small.

As shown in FIG. 3, when combustion air is introduced at a relatively high speed through the air inlet pipe 4, the air passes above the inner cylinder 2 and faces the air inlet pipe 4. Side surface 11 of outer cylinder 1
A part of the liquid flows in the direction of the opening 13 of the outer cylinder 1, and the rest flows towards the adjustment plate 3 while swirling in the gap between the inner cylinder 2 and the outer cylinder 1.

At this time, the speed of the air flow is relatively high on the side 11 side where the air from the air feed pipe 4 collided with, and the speed decreases as it goes to the side where the air feed pipe 4 is installed. There is.

This non-uniform flow of air is made into a uniform flow by the flow regulating plate 3, further flows toward the bottom of the outer cylinder 1, passes through the lower part of the inner cylinder 2, and is directed inside the inner cylinder 2 from the bottom to the top. It flows and circulates.

At this time, when liquid fuel is sprayed from the spray nozzle 5 and ignited, the sprayed fuel particles burn near the upper end of the cabinet 2, and a swirling air flow is generated by the air fed from the air feed pipe 4. The combustion air moves downward through the gap between the cabinet 2 and the outer cylinder 1, and is made into a uniform flow by the flow regulating plate 3 in the same manner as above, passes through the lower part of the inner cylinder 2, and returns to the inner cylinder. Circulate and rise within 2.

During this time, the fuel particles are heated by the inner cylinder 2 heated by the combustion heat near the upper end of the cabinet 2 and the M combustion heat, and are vaporized in a short time.

Further, the draft force generated from the combustion gas after the fuel particles have been vaporized promotes the upward airflow within the inner cylinder 2, promoting circulation, and thus further promoting the vaporization of the fuel particles.

In this state, only a part of the combustion air sent from the air inlet pipe 4 is circulated through the gap between the inner cylinder 2 and the outer cylinder 1, so the vaporized fuel is There is not enough oxygen in the cylinder 2, so combustion does not occur, but blue flame vaporization combustion occurs near the outer cylinder opening 13 where it is completely mixed with the combustion air from the air inlet pipe 4.

Therefore, the velocity of the combustion air fed from the air inlet pipe 4 is made higher than the velocity of the rising gas from inside the inner cylinder 2 in order to entrain and circulate the rising gas from inside the inner cylinder 2. 1. It varies depending on the size and shape of the inner cylinder 2, the capacity of the spray nozzle 5, etc., but usually the rising gas velocity is 5 to 15
It is preferable to set it to about twice as much.

Blue flame vaporization combustion is possible even at 15 times or more, but the noise becomes louder.

Although the above embodiment shows a row in which the combustion devices are installed facing upward, it is also possible to install them facing downward or sideways.

As mentioned above, in the liquid fuel combustion device of the present invention, the liquid fuel sprayed from the spray nozzle is mixed with combustion air, circulated, heated by the combustion heat, and vaporized, so that the liquid fuel is vaporized in an extremely short period of time. Blue flame vaporization combustion can be obtained.

In addition, since the liquid fuel combustion device of the present invention is provided with a flow regulating plate in the gap between the outer cylinder and the inner cylinder, the mixed air flow of swirling and circulating air and fuel is made uniform, and pulsation phenomena etc. are prevented. It is possible to obtain stable blue flame vaporization combustion.

Therefore, the liquid fuel combustion device of the present invention can easily control instantaneous combustion (starting, stopping), can be applied to high-output combustion devices, and generates very little soot, odor, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the liquid fuel combustion device of the present invention;
FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a longitudinal sectional view illustrating the combustion state of one row of the liquid fuel combustion apparatus of the present invention. DESCRIPTION OF SYMBOLS 1... Outer tube, 11... Side surface of outer tube, 12... Bottom surface of outer tube, 13... Opening of outer tube, 2... Outer tube, 3...
- Flow adjustment plate, 4... Air feed pipe, 5... Fuel spray nozzle.

Claims (1)

[Claims] 1. An inner cylinder smaller than the outer cylinder is installed in a bottomed outer cylinder at a distance from the side, bottom and opening surfaces of the outer cylinder, and an inner cylinder is installed on the upper side of the outer cylinder. An air supply pipe is connected to the upper part of the inner cylinder, a fuel spray nozzle is provided at the bottom of the outer cylinder facing into the inner cylinder, and a flow regulating plate is provided in the gap between the outer cylinder and the inner cylinder. A liquid fuel combustion device characterized by: 2. The flow regulating plate has a structure in which the pore size is large on the air inlet pipe side and becomes smaller on the opposite side. 1
The liquid fuel combustion device described in . 3. Claims 1 or 2 in which the air supply pipe is provided horizontally or slightly upwardly toward the center of the inner cylinder.
The liquid fuel combustion device described in . 4. The liquid fuel combustion device according to claim 1, 2, or 3, wherein the outer cylinder and the inner cylinder are installed concentrically.