JPS609548Y2 - Kerosene vaporization combustor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a kerosene vaporization combustor, and particularly to a type of vaporization combustor that vaporizes and injects kerosene and mixes air to obtain a premixed mixture for combustion.

Conventional combustors of this type have a structure in which the tip of the kerosene injection nozzle pipe of the kerosene vaporization and injection device is inserted into the primary air receiver integrated with the burner body.
The second air receiver is undesirable because if the receiving part becomes hot, the tip of the nozzle pipe will also become hot, and a large amount of kerosene will precipitate there as tar, potentially clogging the nozzle pipe.

On the other hand, if the burner body of the secondary air receiver is made of stainless steel, etc., which has low thermal conductivity, so that the intake part does not become too hot, the temperature of the intake part of the secondary air receiver will be low, so that the injection The kerosene droplets contained in the kerosene gas are not sufficiently evaporated due to partial pressure evaporation, and the secondary air receiver condenses and remains at the bottom of the container.

It is possible to return this condensed kerosene to the kerosene tank, but
It is generally not desirable.

In addition, by raising the temperature of the injected kerosene gas in advance,
- Although it is possible to reduce the amount of kerosene condensed and remaining in the receiving part of the secondary air receiver, in this case, a problem arises in that a large amount of tar is deposited in the vaporizer that heats and vaporizes the kerosene.

Therefore, an object of the present invention is to provide a kerosene vaporization combustor that effectively promotes vaporization of kerosene droplets contained in injected kerosene gas while suppressing tar precipitation.

That is, in this invention, the burner body is made of a straight pipe made of aluminized thin steel with high thermal conductivity, so that the primary air receiving part is kept at a high temperature during combustion operation, and the tip of the kerosene jet nozzle pipe is connected to the burner body. This is based on the fact that the end walls for receiving the primary air are placed opposite to each other at a distance.

The present invention will be described below using embodiments with reference to the drawings.

FIG. 1 shows a schematic configuration of a forced intake/exhaust type kerosene vaporizing combustor as an embodiment of the present invention, where 1 is an air supply pipe and 2 is an exhaust gas discharge pipe.

This combustor includes a burner body 3.

The burner body 3 is made of a straight pipe made of aluminized thin steel with a circular cross section, and as shown in FIGS. 2 and 3, one end is closed with an end cover 301 and the other end is an open surface 302. ing.

Furthermore, a large number of flame holes 303 are formed in a row along the axial direction in the tube wall of the burner body 3 except for the area near the opening surface 302, and these flame holes and flame holes Tabs 304 each project inwardly from the intermediate portions of the tube.

These flame holes 303 and tabs 304 can be formed at the same time by making a U-shaped cut in the wall of a straight pipe and pressing and bending the inner part of the U-shape toward the inside of the pipe.

Note that the tabs 304 are all formed in an inclined position toward the opening surface 302.

At that time, as shown in Fig. 4, the part 30 between the flame holes
5 may be made to be slightly inclined toward the inside of the pipe.

Such a burner main body 3 is provided at a lower position of the combustion chamber 4 in FIG. The end facing the air chamber 5 and provided with the end cover 301 is supported by an adjusting screw 6 on the side wall of the combustion chamber 4.

By rotating the adjustment screw 6 in this manner, the burner body 3 can be moved in the axial direction to change the position of the opening surface 302.

Note that the burner body 3 is of course provided with the flame hole 303 facing upward.

Furthermore, the electromagnetic pump 7 can adjust the flow rate by frequency conversion.
The kerosene gas injection device is capable of feeding the kerosene pumped up from the kerosene tawak 8 into a vaporizer 9 with an electric heater to vaporize it, and to eject kerosene gas from the tip of a nozzle pipe 10 using the vaporization pressure. .

And the nozzle pipe 10 of such a kerosene gas injection device,
It is installed with its tip inserted into the air chamber 5 so that it faces the opening surface 302 of the burner body 3.

During operation, the blower 11 supplies fresh outside air to the air chamber 5 through the air supply pipe 1, and at the same time drives the kerosene gas injection device from the tip of the nozzle pipe 10 to the burner body 3.
kerosene gas is spouted toward the opening surface 302 of.

The jetted kerosene gas enters the mixing section 306 from the opening surface 302 of the burner body 3 while sucking air, is mixed with air, and is discharged from the flame hole 303 into the combustion chamber 4, and secondary air is introduced from the air chamber 5. Since it comes into contact with the air that has flowed into the combustion chamber 4 through the hole 12, it burns when ignited.

When combustion occurs, since the burner body 3 is made of a material with high thermal conductivity, the mixing section 306 becomes high temperature, and the kerosene gas that subsequently flows into the mixing section 306 is heated even if it contains droplets of kerosene. It also promotes partial pressure evaporation and continues to produce a premixture suitable for combustion.

In this way, partial pressure evaporation of the kerosene droplets is promoted, so even if a large amount of kerosene droplets are contained in the kerosene gas ejected from the nozzle pipe 10, they are sufficiently vaporized in the mixing section 306, and there is no risk of condensation of kerosene remaining. Therefore, the temperature at which the kerosene is heated in the vaporizer 9 is relatively low, for example, about 260° C., and the generation of tar due to heating to high temperatures can be suppressed.

Since the mixing part 306 is at a low temperature before and immediately after the start of combustion, splashed kerosene remains in liquid form at the bottom of the mixing part 306, but this kerosene is collected in the tray 13, which is separated from the burner body 3. , and is preferably returned to the kerosene tank 8 through the recovery pipe 14.

Since the kerosene recovered at this time is at a low temperature, no problems arise.

Also, although the mixing section 306 is heated to a high temperature, the nozzle pipe 10
The tip of the nozzle pipe 10 faces the opening surface 302 of the burner body 3 at a distance, and is always in contact with the low-temperature air flowing into the air chamber 5, so it never becomes very hot, and therefore the nozzle pipe 10 The precipitation of tar can also be suppressed.

In addition, since the amount of air entering the burner body 3 effectively follows the amount of kerosene gas jetted out from the nozzle pipe 10, the amount of kerosene gas jetted out can be adjusted by adjusting the drive speed of the electromagnetic pump 7 and the properties of the electromagnetic pump 7. Even if there is pulsation, a premixture of kerosene and air suitable for combustion is always produced in the mixing section 306, thereby preventing lifting of the combustion flame and flashback.

It will be understood that the basic ratio of the amount of air to the amount of kerosene gas supplied can be adjusted by rotating the adjustment screw 6.

In the above description, the tip of the nozzle pipe 10 is located at the opening surface 3 of the burner body 3.
02, but even if the tip of the nozzle pipe 10 is slightly inserted into the burner main body 3, the nozzle pipe 10 and the wall of the burner main body 3 will not touch each other. As long as there is a gap, the same effect can be obtained.

The exhaust gas after being burned in the combustion chamber 4 passes through a heat exchanger 15 and is discharged to the outside from the exhaust gas exhaust pipe 2.

As explained above using the embodiments, according to the present invention,
There is no condensation of kerosene remaining in a part of the burner body.
Furthermore, it is possible to obtain an extremely excellent kerosene vaporization injection type combustor which can suppress the precipitation of kerosene as tar and is free from the risk of lifting or flashback in the combustion flame.

Furthermore, according to this combustor, by rotating the adjustment screw, the basic ratio of the amount of air to the amount of kerosene gas supplied can be easily adjusted, and the adjustment screw penetrates the side wall of the combustion chamber and is exposed to the outside. Therefore, there is an advantage that the adjustment operation can be easily performed from the outside.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a plan view of an embodiment of the burner main body, and Fig. 3 is the same <m-
FIG. 4 is a cross-sectional view taken along line m, and a cross-sectional view of a main part of another embodiment of the burner body. 3...Burner body, 5...Air chamber, 7
... Curved electromagnetic pump, 8 ... Kerosene tank, 9 ...
... Carburetor, 1° ... Nozzle pipe, 11...
...Blower, 301, bend, end cover, 302...
- Opening surface, 303... curved flame hole, 304... tab, 306... mixing part.

Claims (1)

[Scope of utility model registration request] A burner body consisting of a wall of a straight tube made of aluminized thin steel with one end closed and a large number of flame holes arranged in a row along the axial direction is disposed in the combustion chamber, and the other end of the burner body is connected to a cylinder where air is fed under pressure. The nozzle pipe of the kerosene gas injection device is opened to the receiving air chamber, and the kerosene supplied from the oil tank to the vaporizer by the electromagnetic pump is ejected from the tip of the nozzle pipe as kerosene gas.
The tip is inserted into the air chamber so as to face the open end wall of the burner body at a distance, and the burner body is movable in the axial direction, and the closed end of the burner body is connected to the combustion chamber. A kerosene vaporization combustor, characterized in that an adjustment screw is provided passing through a side wall of the chamber, and the distance between the opening end wall of the burner body and the tip of the nozzle pipe can be adjusted by the adjustment screw.