JPS5929768B2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device that evaporates and burns petroleum fuel.

Conventionally, such a liquid fuel combustion device uses a premixing chamber in the vaporization cylinder, preheats the vaporization cylinder with a heater, etc., and sends the liquid fuel by a method such as spraying or rotation to vaporize and burn it. Ta.

However, conventional devices require a long preheating time to preheat the vaporizing cylinder, and cannot perform instantaneous vaporization and combustion.

Further, 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.

The present inventor has overcome these drawbacks and has developed a combustion device that can perform blue flame vaporization combustion almost instantaneously without using an electric heater.

As shown in FIGS. 1 and 2, in this combustion device, an inner cylinder 2 is installed and fixed in a bottomed outer cylinder 1 at intervals from a side surface 11, a bottom surface 12, and an upper end surface 13 of the outer cylinder 1. Air supply pipe 3 that blows air upward into the inner cylinder 2 into the upper side surface 11 of the cylinder 1
A fuel spray nozzle 4 is provided at the center of the bottom of the outer cylinder 1 facing into the inner cylinder 2.
When combustion air is blown into the combustion air at a speed of 20 to 30 mAec and liquid fuel is sprayed from the fuel spray nozzle 4 and ignited, the sprayed fuel particles are mixed with the combustion air and flow into the inner cylinder 2.
It burns inside the outer cylinder 1 near the upper end, and part of it is caught in the combustion air flow and swirls downward through the gap between the outer cylinder 1 and the inner cylinder 2 as shown by the arrow in Fig. 2. While descending, passing through the lower part of the inner cylinder 2, and rising inside the inner cylinder 2 again, 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 this combustion heat. It becomes vaporized, mixes with combustion air from the air feed pipe 3 near the upper end of the inner cylinder 2, and burns.

The burning flame is a red flame when ignited, but this lasts for an extremely short time of around 1 second, and almost instantaneously changes to a blue flame.

In this combustion state, the fuel particles that descend between the outer cylinder 1 and the inner cylinder 2 and are vaporized do not burn because there is not enough oxygen.

This combustion device has a high heat combustion capacity and can perform blue flame vaporization combustion almost instantaneously, but the combustion air blown from the air supply pipe 3 is at the center of the upper end surface of the inner cylinder 2. Some of the fuel particles atomized from the atomizing nozzle, especially large fuel particles, are not mixed into the combustion air stream because they pass through the air inlet tube 3 and impinge on the inner surface of the outer cylinder 1 opposite to the air inlet tube 3. However, it has the disadvantage that it jumps out from the upper end of the outer cylinder 1 and burns with insufficient mixing with air, producing red flames in some areas and emitting soot and odor.

Therefore, as a result of further research in order to eliminate the drawbacks of this combustion device, the present inventor found that in the combustion device 1, a combustion air inlet is provided inward at the upper edge of the outer cylinder 1, and It was discovered that the red flame can be eliminated by blowing in fresh air, and the object of the present invention is to achieve complete blue flame vaporization combustion almost instantaneously, and it can also be applied to combustion equipment with large output. The present invention aims to provide a liquid fuel combustion device.

Next, the present invention will be explained with reference to the drawings.

3 and 4 are a plan view and a sectional view showing an example of the combustion apparatus of the present invention, and the outer cylinder 1, the inner cylinder 2, the air feed pipe 3, and the fuel spray nozzle 4 are shown in FIGS. 1 and 2. The configuration is similar to that shown in the figure.

21; 21 is a connecting rod that fixes the inner cylinder 2 within the outer cylinder 1.

Reference numeral 5 denotes an air outlet provided near the upper end periphery of the outer cylinder 1 above the air feed pipe 3, and is provided at the upper end periphery of the outer cylinder 1 so as to blow out combustion air toward the inside of the cylinder. ing.

An annular air supply pipe 6 having the same inner diameter as the diameter of the outer cylinder 1 is provided at the upper end of the outer cylinder 1, and small holes 61, 61 . ...or a slit is provided, and the pore 6L61. ...or the slit serves as the air outlet 5.

Combustion air is supplied to the air supply pipe 6 through a duct 62 by a blower (not shown).

Even if the combustion air supplied from the air inlet pipe 3 and the air outlet 5 is supplied from separate blowers, it is branched and supplied from the same blower, and the amount of air supplied to each can be adjusted by a gate valve. Alternatively, it is preferable to adjust the diameter or number of the pores 61 or adjust the slit width so that the combustion air blown out from the air outlet 5 becomes uniform in the circumferential direction.

To use the combustion device configured in this way, combustion air is blown through the air inlet pipe 3 as described above, and the fuel sprayed from the spray nozzle 4 is sent to the outer cylinder near the upper end of the inner cylinder 2. At the same time, combustion air is blown in from the air outlet 5 to achieve sufficient combustion for the atomized fuel particles that fly out of the outer cylinder 1 without being mixed with the combustion air flow from the air intake pipe 3. It mixes the air and causes blue flame combustion.

If the amount of combustion air blown in from the air outlet 5 is about 10 to 30% of the amount of combustion air blown in from the air feed pipe 3, no red flame will be generated.

If the air amount exceeds 30%, the temperature of the combustion gas will drop, which is not preferable.

FIG. 5 is a longitudinal sectional view showing another example of the present invention.

In the example shown in FIGS. 3 and 4, the annular air supply pipe 6 consists of a jacket 6' provided around the outer circumference of the quiver 1, and the annular space between the outer cylinder 1 and the jacket 6' is used to supply air. The upper end of the jacket 6' is bent inward, and the gap between the upper end of the jacket 6' and the first end of the outer cylinder 1 forms an air outlet 5'.

In this way, since the combustion air blown in from the air outlet 5' is supplied through the space between the outer cylinder 1 and the jacket 6', it is heated by the outer cylinder 1, which is heated by combustion heat, and the temperature is lowered. Since the combustion air is blown in as high-quality combustion air, the fuel particles flying out from the outer cylinder 1 can be more completely combusted.

In addition, the outer periphery of the outer cylinder 1, which is heated to a high temperature, is covered with a jacket 6', and the outer cylinder 1 is cooled by the combustion air supplied between the outer cylinder 1 and the jacket 6', so that the combustion apparatus When it is incorporated into other equipment, there is no need to use insulation materials to insulate it.

In addition, although the above explanation was given as an example in which the combustion device is installed facing upward, the combustion device of the present invention can also be installed horizontally or downward.

Further, by providing an annular diaphragm plate 7 on the inner surface of the outer cylinder 1 at the upper end of the inner cylinder 2, the airflow circulating between the inner cylinder 2 and the outer cylinder 1 can be made uniform in the circumferential direction.

The liquid fuel combustion device of the present invention is configured as described above,
The liquid fuel sprayed from the fuel spray nozzle descends between the outer cylinder and the inner cylinder by the combustion air from the air supply pipe, is circulated from the bottom of the inner cylinder into the inner cylinder, and is combusted near the upper end of the inner cylinder. Since it is vaporized and combusted by the combustion heat, a blue flame vaporization combustion state can be obtained almost instantaneously without using an electric heater. Since a combustion air outlet is provided near the periphery toward the inside of the outer cylinder, the combustion air should not be blown in from this air outlet and mixed with the combustion air flow from the air inlet pipe. The atomized fuel particles that fly out of the outer cylinder are mixed with sufficient combustion air to achieve complete blue flame 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 can achieve complete blue flame combustion with minimal generation of soot or odor. There are fewer of them.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a liquid fuel combustion device developed prior to the present invention, FIG. 2 is a longitudinal sectional view of the combustion device of FIG. 1, and FIG. 3 is an example of the combustion device of the present invention. A plan view, FIG. 4 is a vertical sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a vertical sectional view showing another example of the combustion apparatus of the present invention. 1...Outer cylinder, 11...Side surface of outer cylinder, 1
2... Bottom surface of the outer cylinder, 13... Upper end surface of the outer cylinder, 2... Inner cylinder, 21... Connecting rod,
3...Air supply pipe, 4...Fuel spray nozzle, 5,5'...Air outlet, 6...
・Air supply pipe, 61... Pore, 62...
・Duct, 6'... Jacket.

Claims (1)

[Scope of Claims] 1. An inner cylinder smaller than the outer cylinder is installed within the bottomed outer cylinder at intervals from the side, bottom and top surfaces of the outer cylinder, and an inner cylinder is installed on the upper side of the outer cylinder. An air inlet pipe is connected to the upper part of the inner cylinder, a fuel spray nozzle is provided at the bottom of the outer cylinder to face the inside of the inner cylinder, and an outer cylinder is connected to the upper end of the outer cylinder above the air inlet pipe. A liquid fuel combustion device characterized in that a combustion air outlet is provided toward the inside of a cylinder. 2. An annular air supply pipe having an inner diameter that is the same as the diameter of the outer cylinder is provided on the upper edge of the outer cylinder, and an air blower consisting of pores or slits is provided along the circumferential direction on the inner peripheral surface of this air supply pipe. A liquid fuel combustion device according to claim 1, further comprising an outlet. 3. Claim 1, in which a jacket is provided on the outer periphery of the outer cylinder, the upper end of the jacket is bent inward, and the gap between the upper end of the jacket and the upper end of the outer cylinder is used as an air outlet. The liquid fuel combustion device described in .