JPS5929767B2 - 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 interior of the vaporizing cylinder is used as a premixing chamber, which is preheated with a heater or the like, and the liquid fuel is sent by a method such as spraying or rotation for vaporization and combustion.

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

In addition, 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 can instantaneously reach blue flame vaporization combustion and sustain combustion in this state for a long time, and can also 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, bottom and opening surfaces of the nuclear outer cylinder, and 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 an annular pipe along the outer cylinder is provided in the gap between the outer cylinder and the inner cylinder. The liquid fuel combustion device is characterized in that a diaphragm plate is provided to protrude toward the inner cylinder to narrow the gap between the outer cylinder and the inner cylinder.

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 cylindrical outer cylinder with a bottom,
An inner cylinder 2 smaller than the outer cylinder 1 is provided inside.

The inner tube 2 is open at both ends, and is fixed by an inner tube support rod 6.6 at a distance from the side surface 11, bottom surface 12, and opening surface 13 of the outer tube 1.

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 designed to collide with 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.

3//i The aperture plate is an annular plate that protrudes toward the inner cylinder 2 along the outer cylinder 1 in the gap between the outer cylinder 1 and the inner cylinder 2, and the aperture plate 3 allows the outer cylinder 1 to The gap with the inner cylinder 2 is narrowed.

The diaphragm plate 3 may be provided in the gap between the outer cylinder 1 and the inner cylinder 2, but it can
It is preferable to protrude from the outer cylinder 2 toward the range of the lowered position.

In addition, the width of the protruding plate 3 is made smaller on the side of the air inlet pipe 4 to create a wider gap between the aperture plate 3 and the inner cylinder 2, and on the opposite side, the protruding width is made larger so that the aperture is narrowed. Preferably, the gap between the plate 3 and the inner tube 2 is narrow.

In addition, in the combustion device of the present invention, the combustion output is determined by the diameter of the inner cylinder 2, and the inner diameter of the outer cylinder 1 and the dimensions of the diaphragm plate 3 are determined according to the inner cylinder 2. For example, if the cross-sectional area S0 of the inner cylinder 2, the cross-sectional area S2 of the gap between the outer cylinder 1 and the inner cylinder 2, and the cross-sectional area S3 of the gap between the inner cylinder 2 narrowed by the aperture plate 3, S2/S1 is 0. 8-0.95, S3/
It was found that setting S1 in the range of 0.4 to 0.6 was very preferable in terms of sustaining blue flame vaporization combustion.

To use this combustion device, combustion air is first introduced through the air inlet pipe 4.

As shown in Fig. 3, this air passes above the inner cylinder 2,
The air collides with the side surface 11 of the outer cylinder 1 facing the air inlet pipe 4, a part of which flows toward the opening 13 of the outer cylinder 1, and the rest swirls in the gap between the inner cylinder 2 and the outer cylinder 1 and is throttled. Flows towards plate 3.

At this time, the speed of the air flow is relatively high on the side surface 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. .

This uneven flow of air is made into a uniform flow by the diaphragm plate 3, and 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 the liquid fuel is sprayed from the spray nozzle 5 and ignited, the sprayed fuel particles burn near the upper end of the inner cylinder 2, and the swirling air generated by the air fed from the air feed pipe 4 It is caught in the flow and moves downward through the gap between the inner cylinder 2 and the outer cylinder 1 together with the combustion air, and is made into a uniform flow by the throttle plate 3 in the same way as above, passing through the lower part of the inner cylinder 2 and flowing back into the interior. It circulates inside the cylinder 2 and rises.

During this time, the fuel particles are heated by the combustion heat near the upper end of the inner cylinder 2 and the inner cylinder 2 heated by the 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 sent 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 involve the rising gas from the inner cylinder 2 and circulate it in a swirling manner. Although it varies depending on the size and shape of the inner cylinder 2 and the aperture plate 3, the capacity of the spray nozzle 5, etc., it is usually preferably set to about 5 to 15 times the rising gas velocity.

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

In addition, in the combustion apparatus of the present invention, the purpose of providing the throttle plate 3 is not only to ensure a uniform flow of combustion air as described above, but also to prevent the inner cylinder 2 from being excessively heated and to suppress the blue flame. This is to sustain vaporization combustion.

That is, when the diaphragm plate 3 is not provided, if combustion continues, the inner cylinder 2 will be heated to a red-hot state by the combustion gas circulating through the gap between the inner cylinder 2 and the outer cylinder 1, and this will cause the inner cylinder 2 to heat up to a red-hot state. The vaporized fuel circulating in the gap between the inner cylinder 2 and the outer cylinder 1 starts to burn in an oxygen-deficient state in the inner cylinder 2, and furthermore, the fuel particles sprayed from the spray nozzle 5 burn without being vaporized. Although red flame is generated, by providing the throttle plate 3, excessive heating of the inner cylinder 2 by the combustion gas is prevented, and blue flame vaporization combustion can be maintained.

In addition, in the above example, the combustion device was installed facing upward, but it is also possible to install it 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 throttle 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 there is no pulsation phenomenon. Stable blue flame vaporization combustion can be obtained, and since the cylinder is not heated excessively, combustion in an oxygen-deficient state can be prevented and blue flame vaporization combustion can be sustained.

Therefore, the liquid fuel combustion device of the present invention has easy instantaneous combustion mode (start-up, stop), can be applied to high-output combustion devices, and generates extremely 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 a combustion state of an example of the liquid fuel combustion apparatus of the present invention. 1...Outer cylinder, 11...Side surface of outer cylinder, 1
2...Bottom surface of the outer cylinder, 13...Opening surface of the outer cylinder, 2...Inner cylinder, 3...Aperture plate, 4
... Air supply pipe, 5 ... Fuel spray nozzle, 6 ... Inner cylinder support rod.

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 an annular groove along the outer cylinder is provided in the gap between the outer cylinder and the inner cylinder. A liquid fuel combustion device characterized in that a diaphragm plate is provided protruding toward the inner cylinder to narrow the gap between the outer cylinder and the inner cylinder. 2 The cross-sectional area S1 of the inner cylinder, the cross-sectional area S2 of the gap between the outer cylinder and the inner cylinder, and the cross-sectional area S3 of the gap narrowed by the aperture plate, S2/S1 is 0.8 to 0.95, S3 /S1 is 0.4
The liquid fuel combustion device according to claim 1, wherein the liquid fuel combustion apparatus has a range of 0.6 to 0.6. 3. Claim 1 or 2, wherein the aperture plate protrudes from the outer cylinder within the range between the upper end of the inner cylinder and a position 115 degrees lower than the length of the inner cylinder from this upper end. liquid fuel combustion equipment. 4. The liquid fuel combustion device according to claim 1, 2, or 3, wherein the air inlet pipe is provided horizontally or slightly diagonally upward toward the center of the inner cylinder. 5. The liquid fuel combustion device according to claim 1, 2, 3, or 4, wherein the outer cylinder and the inner cylinder are arranged concentrically.