JPS61180821A - Liquid fuel burning device - Google Patents

Abstract

PURPOSE:To prevent the generation of an offensive odor at the time of flame extinction by installing a suck-in device which sucks in a mixed gas of liquid fuel and air and exhausts to the outside with no heating of the gas. CONSTITUTION:By the flame extinction operation, burning amount is reduced and an excess air ratio varies. As fuel component which causes the generation of an offensive odor is sucked into the flow paths which are used for supplying air normally (blast pipes 11, 12) by a blower 10 previously before the step of the generation of the offensive odor, the excess air ratio reaches a maximum rapidly and the flame extinction takes place at the same time and so, the generation of the offensive odor is improved to be almost none. As fuel which is sucked into the flow paths (11, 12) is in the condition of vaporization or corpuscular, the gas has very weak odor and considerable reduction of the offensive odor is obtained. When the gas is exhausted from the paths (11, 12), the gas is not hardly affected by heat from a flame hole part 18 and the place nearby burning space of which temp. becomes high due to burning and therefore, the gas is exhausted before the outbreak of the reaction which changes fuel component into the offensive one.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and an object thereof is to provide a liquid fuel combustion device that does not emit odor when extinguishing a fire.

Combustion devices that use liquid fuels such as petroleum are used in a wide range of applications, but they have the drawback of emitting a strong odor, especially when extinguishing fires.

The present invention prevents the occurrence of this odor during extinguishing,
An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows the configuration of an embodiment of the present invention. First, the fuel system will be explained.

1 is a fuel tank, and liquid fuel is sent to a fuel supply section 3 by a pump 2. Reference numeral 4 denotes an overflow type constant oil level device that supplies fuel in an amount commensurate with fuel consumption to the fuel supply section 3, but excess fuel is returned to the fuel tank 1 through a return passage 6. 6 is a porous body, the lower end of which is the fuel supply part 3
The fuel is immersed in the fuel, and the fuel is sucked up into the fuel vaporization section 7 at the upper end. Reference numeral 8 denotes a heating element provided close to the fuel vaporization section 7, which generates heat when energized and transfers the heat necessary for vaporization to the fuel vaporization section 7.
It is given to

Next, the air system will be explained. 9 is an air supply port, 10 is a blower, 11.12 is a blower pipe, 13 is a switching pipe, and 14.15 is a valve. Note that a large number of small holes are provided in a portion of the blast pipe 11 facing the fuel vaporization section 7. Further, the arrows shown in FIG. 1 indicate the direction of air flow during combustion.

Next, the combustion system will be explained. 16 is the lower mixing chamber, 17
is an upper mixing chamber in which the fuel vaporized from the fuel vaporization section 7 and the air supplied from the blast pipe 11.12 are mixed into both the mixing chambers 16.
The fuel is sufficiently mixed at step 17 , and then passes through a flame port 18 and burns in a combustion space 19 . Note that 2o is a partition plate having a plurality of small holes, and 21 is a partition chamber, and the air that has entered the partition chamber 21 from the blower pipe 12 is introduced into the lower mixing chamber 16 through the small holes in the partition plate 2o. has been done. Also, 2
2 is a discharge port.

Figure 2 shows the direction of air flow during fire extinguishing and the position of valve 14.15 in the embodiment shown in Figure 1. I have provided a comparison to make it easier to understand.

Incidentally, the ignition method in this embodiment is a Pon 129 heating element 8. Blower10. This is done by energizing a high-pressure intermittent discharge igniter (not shown) provided close to the flame port 1C and setting the valves 1-J- and 1g in the position shown in FIG. Furthermore, the fire extinguishing method is to stop the energization mentioned above and valve 14. IS is performed by setting the state as shown in FIG. At this time, the drive power to the blower 1o is cut off, but the blower 1o continues to be driven for a while due to its inertial force, thereby causing the gas to flow in the direction of the arrow shown in FIG.

Next, the effects of this embodiment will be explained.

First, we will clarify the mechanism behind the odor generated during conventional fire extinguishing. FIG. 3 shows the excess air ratio of the mixture supplied to the combustion space in the conventional example on the vertical axis and the horizontal axis as the elapsed time before and after extinguishing the fire. In the same figure, in the continuous combustion stage A, the excess air ratio is stable at an appropriate value, indicating a practically complete combustion state, and practically no odor is generated. When entering transition stage B, the combustion amount decreases and at the same time the excess air ratio increases and may even fluctuate in the opposite direction) leading to extinguishment (point b). but,
Before extinguishing, the combustion flame lift phenomenon occurs and enters odor generation stage C, and even after extinguishing, fuel components continue to be released into the combustion space, and are heated by heat from the high temperature part heated during combustion. , it changes into an odor component (for example, aldehyde, etc.) different from that of simple vaporized fuel, and generates an extremely strong odor.

Note that the heating conditions under which a fuel component changes into an odor component are difficult to express simply because it is a function of time, but by not heating the fuel component to a temperature above the boiling point, it is possible to prevent the fuel component from changing into an odor component. .

Next, to explain the case of the embodiment of the present invention, as shown in FIG. 4, which is shown on the same scale as FIG. Before entering the odor generation stage B, as shown in Fig. 2, the fuel components that cause odor generation are separated by the blower 1o (the
．． 12), the excess air ratio rapidly increases to the maximum state and becomes a state where there is only air with no fuel components),
Extinguish the fire at the same time. Therefore, the occurrence of odor will be improved to zero.

The fuel components sucked into the separate passages (11, 12) are discharged to the outside without being heated, so the mere vaporization or atomization of the fuel produces only an extremely weak odor, resulting in a considerable odor reduction effect. It will be done. That is, separation route (11, 12
), the flame opening 18 that became high temperature during combustion.
Alternatively, since the fuel is not heated under the influence of high temperatures from the portions close to the combustion space 19, it can be discharged without any reaction that changes the fuel components into odor components. At this time, some fuel components tend to condense in the flow path from suction to discharge and adhere to the solid surface, but the occurrence of this phenomenon does not impede the essence of the present invention in any way.

Although it is possible to provide a suction device separately from the blower 10, it is better to form a configuration in which the blower 10 operates as a blower device during combustion and as a suction device when extinguishing a fire, as in the embodiment. , it has great advantages in terms of cost, space, operation timing adjustment, etc.

Furthermore, when the blower 10 is operated as a suction device during fire extinguishing, the suction amount must be appropriately designed to eliminate the risk of explosion due to backfire from the combustion space 19 to the mixing chamber 16,17. This is effective, and in the case of the embodiment of the present application, the amount of suction is optimized by providing a constriction portion in the discharge port 22.

As described above, the present invention has the effect of significantly reducing odor during fire extinguishing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a liquid fuel combustion device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating the operation of the same liquid fuel combustion device during fire extinguishing, and FIG. 3 is a conventional example of fire extinguishing. FIG. 4 is a diagram illustrating the odor generation mechanism, and FIG. 4 is a diagram illustrating the fire extinguishing odor effect of the present invention. 10...Blower (suction device), 16...
・Lower mixing chamber, 17... Upper mixing chamber, 19...
...Combustion space, 22...Exhaust port. Name of agent: Patent attorney Toshio Nakao and 1 other person
ゝFigure 3 Sekima □

Claims (1)

[Claims] A suction device, which is inactive while combustion continues, is connected to the space where the liquid fuel moves toward the combustion part in a gaseous or particulate state, and when the fire is extinguished, the suction device is activated to remove the liquid fuel in the above state and the air. A liquid fuel combustion device characterized by sucking a mixed gas and discharging this gas to the outside without heating it.