JPS5929769B2 - 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 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. An air inlet pipe 3 for blowing air upward into the inner cylinder 2 is connected to the upper side surface 11 of the outer cylinder 1, and a fuel spray nozzle is connected to the bottom of the outer cylinder 1 in the center to direct it into the inner cylinder 2. 4 is provided, and when combustion air is blown in from the air supply pipe 3 at a speed of 20 to 30 m/see and liquid fuel is sprayed from the fuel spray nozzle 4 and ignited, the sprayed fuel particles are combusted. It mixes with the combustion air and burns inside the outer cylinder 1 near the upper end of the inner cylinder 2, and a part of it is caught up in the air flow of the combustion air and is separated from the outer cylinder 1 and the inner cylinder as shown by the arrow in Fig. 2. While descending while swirling downward through the gap between the inner cylinder 2 and the inner cylinder 2, passing through the lower part of the inner cylinder 2 and rising inside the inner cylinder 2 again, the fuel particles absorb combustion heat near the upper end of the inner cylinder 2 and this combustion heat: E: ; It is heated from the inner cylinder 2 and mixed with the air from the air supply pipe 3 near the upper end of the vaporized cylinder 2 to be burned.

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 calorific capacity and can perform blue flame vaporization combustion almost instantaneously, but most of the blue flame is generated near the upper end of the inner cylinder 2, and some Outer cylinder 1
Therefore, when used as a heat source for a water heater or the like, combustion gas is the main heating source, and the radiant heat from combustion cannot be used effectively.

In addition, the combustion air from the air supply pipe 3 is 20 to 30 m/
The combustion noise was loud because it was blown in at a high speed of 1.5 seconds.

Therefore, the inventor conducted further research and completed the present invention in order to eliminate the drawbacks of this combustion device. The object of the present invention is to provide a liquid fuel combustion device that can perform vaporization combustion, generate blue flame outside the device, and produce quiet combustion noise.

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

FIG. 3 is a longitudinal sectional view showing an example of the combustion device of the present invention, showing an outer cylinder 1, an inner cylinder 2, an air supply pipe 3, and a fuel spray nozzle 4.
is constructed similarly to that shown in FIGS. 1 and 2.

Reference numeral 5 denotes an evaporation cylinder, which is connected to one end of the outer cylinder 1.

This evaporation tube 5 may have approximately the same diameter as the outer tube 1 and be provided concentrically with the outer tube 1, but if the outer tube 1 is extended and the outer tube 1 is
Preferably, it is integrated with the

Also, the length of this evaporation tube 5 is 0.3 to 2 of the inner diameter of the outer tube 1.
It is good to set it as 5 times, preferably in the range of 0.5 to 20 times.

Reference numeral 6 denotes an air outlet, which is provided near the upper edge of the evaporator cylinder 5 toward the inside of the evaporator cylinder.
More combustion air is blown out.

The air outlet 6 is formed at the tip of an air passage 7 provided around the outer cylinder 1 and the evaporation cylinder 5, and air is forced into the air passage 7 through a blow pipe 71 from a blower (not shown). It looks like this.

A gap 72 is formed outside the evaporation tube 5 in the air passage 7, and the air that is pressure-fed through the air passage 7 closes the evaporation tube 5.
is prevented from cooling down.

Reference numeral 8 denotes a top plate, which is provided on the top of the evaporation tube 5 so as to close the center of the evaporation tube 5.

Preferably, the top plate 8 has a conical shape that projects inward of the evaporation tube 5.

In addition, 21 is a connecting rod for fixing the inner cylinder 2 in the outer cylinder 1,
31 is a connecting rod that fixes the top plate inside the evaporation cylinder 5.

Next, a method of burning liquid fuel using the combustion device configured as described above will be explained.

First, similarly to the combustion apparatus shown in FIGS. 1 and 2, combustion air is blown in from the air supply pipe 3, liquid fuel is sprayed from the fuel spray nozzle 4 and ignited, and the fuel is ignited near the upper end of the inner cylinder 2. Blue flame vaporization combustion is performed, and the evaporation cylinder 5 is heated by this combustion heat.

When the evaporation cylinder 5 is sufficiently heated, the amount of combustion air from the air supply pipe 3 is reduced, and the combustion air is blown out from the air outlet 6, producing blue flame above the air outlet 6. .

When the amount of combustion air from the air supply pipe 3 is reduced, the flame that was sprayed from the fuel spray nozzle 4 and was evaporating and burning becomes smaller due to lack of oxygen, and a part of it evaporates and vaporizes in an unburned state. It is ejected from the cylinder 5, mixed with combustion air from the air outlet 6, and combusted.

When the combustion air from the air supply pipe 3 is reduced, some of the sprayed liquid fuel passes between the outer cylinder 1 and the inner cylinder 2, circulates from the lower end of the inner cylinder 2 into the inner cylinder 2, and is evaporated. The rate at which the evaporation occurs decreases, and the droplets that are sprayed out adhere to the inner surface of the evaporation cylinder 5, but this evaporation cylinder 5 is heated by the flame burning near the upper end of the inner cylinder 2. The droplets adhering to the inner surface of the evaporator tube 5 are heated by the evaporator tube 5 and are also heated by the combustion gas rising inside the evaporator tube 5 to be evaporated and vaporized. When mixed with air, it evaporates and burns, creating a steady state of combustion that produces blue flame.

In this steady combustion state, the amount of combustion air from the air inlet pipe 3 is approximately 15 to 30 times the amount of combustion air required for blue flame vaporization combustion near the upper end of the inner cylinder 2 at the start of combustion. Good.

This is because when a larger amount of air than 30φ is blown, a large amount of flame is generated in the outer cylinder 1 near the upper end of the inner cylinder 2 and in the evaporator cylinder 5, and the proportion of flames generated outside the evaporator cylinder 5 is reduced. ,
Furthermore, if the air amount is less than 15%, the flame generated near the upper end of the inner cylinder 2 will be too small to sufficiently heat the inner cylinder 2 and the evaporation tube 5, causing droplets adhering thereto to evaporate and vaporize. This is because the fuel cannot accumulate at the bottom of the outer cylinder 1.

Further, the combustion air from the air outlet 6 may be adjusted and blown out so that the flame produced becomes a blue flame.

This combustion air is fed to the evaporator tube 5 as shown in FIG.
It is preferable to provide an air passage 7 having a gap 72 on the outside of the outer cylinder 1 so that the air can be supplied to the outer cylinder 1, since it is possible to prevent the outer cylinder 1 from overheating without cooling the evaporator cylinder 5. An air blowing ring having continuous slits or holes on the inner surface may be provided at the upper end of the vaporizing cylinder 5.

Alternatively, a guide tube having approximately the same diameter as the evaporation tube 5 may be provided on one side of the air outlet 6 so that the combustion occurs at the tip thereof.

Furthermore, if the top plate 8 is provided, the sprayed droplets can also adhere to the inner surface of the top plate 8 and be evaporated.
If vaporized gas is ejected from the entire surface of the combustion chamber, the combustion air from the air outlet 6 may not be sufficiently mixed in the center, resulting in red flames due to lack of oxygen. This prevents the air from being sufficiently mixed and causing red flames.

Further, if an annular throttle plate 9 is provided on the inner surface of the outer cylinder 1 near the end of the inner cylinder 2, the air flow circulating between the inner cylinder 2 and the outer cylinder 1 can be made uniform in the circumferential direction.

In the example shown in "-", the combustion device is installed facing upward, but it is also possible to install it horizontally or downward.

The liquid fuel combustion device of the present invention is constructed as described above, in which the liquid fuel sprayed from the fuel spray nozzle is lowered between the outer cylinder and the inner cylinder by the combustion air from the air supply pipe, and the liquid fuel is lowered to the lower end of the inner cylinder. It is circulated in the inner cylinder, vaporized and combusted by the heat of combustion, so a blue flame vaporization combustion state can be obtained almost instantaneously near the top of the cylinder without using an electric heater, and this combustion heat causes evaporation and vaporization. After heating the cylinder, the combustion air from the air inlet pipe is reduced, and the droplets sprayed in the evaporation cylinder are evaporated and vaporized, and mixed with the combustion air from the air outlet to perform evaporation and combustion. As a result, blue flame can be generated outside the combustion device, resulting in a combustion device that can efficiently heat using combustion gas and radiant heat.

In addition, combustion near the upper end of the inner cylinder for heating the evaporator cylinder reduces the combustion air from the air inlet pipe, and the combustion air from the air outlet is supplied from around the evaporator cylinder. Together with this, the result is a combustion device with low combustion noise and low noise.

[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 shown in FIG. 1, and FIG. 3 is an example of the liquid fuel combustion device of the present invention. FIG. 1...Outer cylinder, 11...Side surface of outer cylinder, 1
2... bottom of the outer cylinder, 13... bottom of the outer cylinder.
Two end faces, 2... Inner cylinder, 21... Connecting rod, 3... Air feeding cylinder, 4... Fuel spray nozzle, 5... ... Evaporation cylinder, 6 ... Air outlet, 7 ... Air passage, 71 ...
Air pipe, 72... air gap, 8... top plate,
81...Connecting rod.

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 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 evaporation cylinder with approximately the same diameter as the outer cylinder is installed at the upper end of the outer cylinder. is arranged concentrically with the outer cylinder, and an air outlet for blowing out combustion air toward the inside of the evaporator cylinder is provided near the upper edge of the evaporator cylinder. Device. 2. The liquid fuel combustion device according to claim 1, wherein the evaporation cylinder is integrated with the outer cylinder by extending the outer cylinder. 3. The liquid fuel combustion device according to claim 1 or 2, wherein the length of the evaporation cylinder is 0.5 to 2.0 times the inner diameter of the outer cylinder. 4. Claim 1, wherein the air outlet is formed at the tip of an air passage provided around the outer cylinder and the evaporation cylinder, and a gap is formed between the air passage and the evaporation cylinder.
The liquid fuel combustion device according to item 2 or 3. 5. The liquid according to claim 1, 2, 3, or 4, wherein a conical top plate projecting inward is provided at the center of the upper part of the evaporation cylinder. Fuel combustion equipment.