JPS5929770B2 - 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 apparatus uses the vaporization cylinder as a premixing chamber, 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 the fuel.

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 FIG. 1, 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. An air inlet pipe 3 for blowing air upward into the inner cylinder 2 is connected to the side surface 11, and a fuel spray nozzle 4 is provided at the center of the bottom of the outer cylinder 1 toward the inside of the inner cylinder 2. Then, combustion air is blown in from the air supply pipe 3 at a speed of 20 to 30 m1sec, and when liquid fuel is sprayed from the fuel spray nozzle 4 and ignited, the atomized fuel particles mix with the combustion air and are internalized. Near the upper end of the cylinder 2, it burns inside the cylinder 1, and some of it is caught up in the combustion air flow and burns in the outer cylinder 1 and the inner cylinder 2 as shown by arrows in FIG.
The fuel particles descend while swirling downward through the gap between the inner cylinder 2 and the inner cylinder 2, pass through the lower part of the inner cylinder 2, and rise inside the inner cylinder 2 again.
The combustion heat near the upper end and the inner cylinder 2 heated by this combustion heat are heated to a vaporized state, and the inner cylinder 2 is mixed with combustion air from the air supply pipe 3 near the upper end and combusted. do.

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. The air collides with the inner surface of the outer cylinder 1 on the opposite side from the air inlet pipe 3, and most of the air flows between the outer cylinder 1 and the inner cylinder 2 from near the inner surface of the outer cylinder 1 on the opposite side. As it descended, there was a lack of air on the air feed pipe 3 side, and combustion became slightly uneven, and red flame and soot were also observed.

Therefore, the inventors conducted further research in order to eliminate the drawbacks of this combustion device, and by providing a secondary air inlet pipe in addition to the air inlet pipe 3 above the outer cylinder in the above combustion device, It was discovered that the above-mentioned uneven combustion, red flame, and soot generation can be prevented.

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

FIG. 2 shows a combustion device according to the invention.

The outer cylinder 1, the inner cylinder 2, the air inlet pipe 3, and the fuel spray nozzle 4 are constructed in the same manner as shown in FIG.

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

A flange-shaped aperture plate 5 that projects inward is provided approximately at the center of the inner wall surface of the outer cylinder 1.

The aperture plate 5 is located slightly below the upper end of the inner cylinder 2.

Reference numeral 6 denotes a lower air inlet pipe provided below the air inlet pipe 3.

The lower air feed pipe 6 is provided on the side surface 11 side of the outer cylinder 1 together with the upper air feed pipe 3, and its opening is below the diaphragm plate 5 and the upper end of the inner cylinder 2 and above the lower end of the inner cylinder 2. It is located.

A blower (
(not shown) provides combustion air.

When air is supplied from the upper air supply pipe 3, it mixes with the atomized fuel particles and burns above the upper end of the inner cylinder 2 toward the upper end 13 of the outer cylinder 1, while some air is released outside. The fuel collides with the side surface 14 of the cylinder 1, descends while rotating through the gap between the outer cylinder 1 and the inner cylinder 2, and rises from the bottom 12 of the outer cylinder 1 and the lower end of the inner cylinder 2 through the inside of the inner cylinder 2. The particles are heated by the combustion heat near the upper end of the inner cylinder 2 and from the inner cylinder 2 heated by this combustion heat, become vaporized, mix with air near the upper end of the inner cylinder 2, and burn with blue flame. .

The circulation flow of air from the upper air inlet pipe 3 and the vaporization of fuel particles are slightly biased toward the side surface 14 of the outer cylinder.

A smaller amount of air is introduced into the lower air inlet pipe 6 than in the upper air inlet pipe 3.

Part of the air from the lower air supply pipe 6 is used as combustion air at the upper end of the inner cylinder 2, and the rest is used at the side surface 1 of the inner cylinder 2 and outer cylinder 1.
The fuel particles are completely removed within the inner cylinder 2 by descending through the gap on the first side, rising from the bottom 12 of the outer cylinder 1 into the inner cylinder 2, and combining with the circulation flow of air from the upper air supply pipe 3. It vaporizes, eliminates uneven combustion, prevents the generation of red flames and soot, and instantly achieves complete combustion with blue flame.

It is preferable that the amount of air introduced from the lower air inlet pipe 6 is about 5 to 20% of the amount of air introduced from the upper air inlet pipe 3.

If the amount of air in the lower air supply pipe 6 becomes too large, the inner cylinder 2
This is undesirable because it lowers the temperature.

The liquid fuel combustion device of the present invention is constructed as described above.
In addition to the air inlet pipe provided at the top of the outer cylinder, a secondary air inlet pipe is provided below, so air descends between the outer and inner cylinders and rises up the inner cylinder. With the circulating flow, the fuel particles are vaporized by the heat of combustion and heating from the inner cylinder, and blue flame combustion is achieved uniformly throughout the device, preventing the generation of red flame and soot.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a liquid fuel combustion device developed prior to the present invention, and Fig. 2 is a sectional view of the liquid fuel combustion device of the present invention.
FIG. 1: Outer cylinder, 2: Inner cylinder, 3: Upper air feed pipe, 4: Fuel spray nozzle, 5: Throttle plate, 6: Lower air feed pipe.

Claims (1)

[Claims] 1. An inner cylinder having a smaller diameter than the outer cylinder is installed in a bottomed outer cylinder at a distance from the side, bottom and top end surfaces of the outer cylinder, and a fuel spray nozzle is provided at the bottom of the outer cylinder, A collar-shaped 9 plate is provided on the inner wall of the outer cylinder, and two upper and lower air inlet pipes are provided on the side of the outer cylinder from the same direction, and the upper air inlet pipe is connected to the inner wall above the aperture plate. A liquid fuel combustion device characterized by the fact that the lower air inlet pipe is oriented toward the top of the cylinder and faces the side of the inner cylinder below the throttle plate.