JPS603130B2 - liquid fuel combustor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wick vaporization type liquid fuel combustor.
To adjust the air supply amount distribution and temperature distribution using the inner flame tube and the partition plate attached thereto, suppress the reduction in combustion amount caused by tar-like substances, and the deterioration of exhaust gas, and maintain stable combustion over a long period of time. The purpose is to

The so-called wick vaporization type liquid fuel combustor, in which liquid fuel is sucked up by the capillary action of the wick, vaporized at the tip of the wick, and then combusted within the combustion tube, has been widely used in oil stoves, oil stoves, etc. It had various drawbacks in terms of combustion stability, long-term use life, performance, etc.

That is, (1) The amount of air supplied to the combustion tube is determined by the ventilation force (draft) of the combustion tube, and is greatly influenced by the surrounding temperature and air current (wind). In addition, the pore flames on the inner and outer walls of the combustion tube change depending on the ratio of air to fuel gas and the surrounding temperature, and the pore flames are generated and extinguished due to wind and impact on the combustion tube. occurred easily. Therefore, the latent heat of vaporization supplied to the liquid fuel contained in the lamp wick changes easily, and the amount of fuel vaporized becomes unstable due to disturbance factors such as temperature, wind, and impact. ■
In addition, the tip of the wick is exposed inside the combustion tube and is exposed to a high temperature and oxygen-containing atmosphere, so some of the fuel undergoes oxidation and polycondensation reactions here, producing tar-like substances. Ru.

This tar-like substance blocks the surface and internal capillary tubes of the wick and suppresses the uptake and vaporization of fuel, resulting in a reduction in the amount of fuel vaporized. ■ Due to the above-mentioned attenuation of the amount of fuel vaporized, the balance of the air-fuel ratio within the combustion space of the combustion tube becomes unreliable, resulting in incomplete combustion, which leads to problems such as the generation of large amounts of toxic carbon monoxide, odor, and soot. was.

■ Also, due to the accumulation of the above tar-like substances at the tip of the lamp wick, it becomes difficult to ignite or it takes a long time for stable combustion to occur after ignition, during which time a significant odor, soot, carbon monoxide, etc. This also resulted in the occurrence of

In addition, this tar-like substance could cause the wick to adhere to metal parts such as the inside of the wick and the outer tube, resulting in a dangerous situation in which it was impossible to lower the wick to extinguish the fire. The present invention eliminates the drawbacks of the above-mentioned conventional methods, and provides stable ignition over a long period of time.
This invention provides a combustor that ensures combustion performance and is stable against disturbance factors during combustion.One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a combustion node, which is composed of a cylindrical inner flame tube 2, outer flame tube 3, and outer tube 4 arranged in substantially the same circular shape.

A disk-shaped partition plate 5 is attached to the inside of the inner flame cylinder 2. In addition, the inner flame tube 2 and the outer flame tube 3 each have a large number of air holes 2a.
, 3a are bored, and a combustion space 6 is formed between the inner flame tube 2 and the outer flame tube 3. Reference numeral 7 denotes an inner wick tube, 8 an outer wick tube, and a wick 10 supported by a wick holding fitting 9 is provided between the two.

The tip of the lamp wick 10 protrudes into the combustion space 6 and is connected to the fuel vaporization section 1.
It is 0a. Here, the partition plate 5 has a plurality of closing holes 5a.
However, as shown in Fig. 2, the openings 5a are concentrated at a position r≦2/3■R from the center with respect to the radius R of the partition plate 5, and the area of the plurality of closed openings 5a is The sum of these is set to be 20% or less of the area (R2) of the partition plate 5 (that is, the horizontal cross-sectional area inside the inner flame cylinder 2).

In the above configuration, among the airflow rising due to the draft of the combustion tube 1, part of the air passing through the inner flame tube 2 is blocked by the partition plate 5, resulting in lateral pressure and static pressure. It flows to the air hole 2a of the flame tube 2.

That is, as shown in FIG. 3, most of the air (arrow A) rising inside the core cylinder 7 passes through the entrance 5a of the partition plate 5 and flows further upward, but some of the air flows below the partition plate 5. It flows from the hole 2a into the combustion space 6. Here, due to the resistance of the partition plate 5, especially the air A is the partition plate! A large amount of air flows into the air hole 2a immediately below the air hole 2a, and there is a large amount of air in this portion, creating a nami aiki layer in which the stomatal flame F is likely to be formed. Therefore, as shown in Fig. 3, a stable pore flame F is formed, and a constant amount of heat is supplied to the fuel vaporization part 10a of the lamp wick 10, regardless of disturbance factors such as wind and shock, and the fuel is The amount of vaporization can be stabilized. Furthermore, by densely arranging the air holes 2a directly below the partition plate 5, the wall temperature of the inner flame cylinder 2 is sufficiently increased due to the interaction of the stomatal flame F, and a more stable stomatal flame F is formed. It can be made less susceptible to disturbance factors. Open the partition plate 5 here□
Stomatal flame directly below the partition plate 5 when air is applied from the front of the combustion tube 1 during combustion, relative to the closed area ratio of 5a (sum of areas of multiple openings 5a/total area of the partition plate 5; seam R2) When the stability rate of F (residual rate of pore flame F) is shown for three types of combustion cylinder 1 specifications, the results are shown in Figure 5.

As can be seen from FIG. 5, if the Sekiguchi area ratio for all three types is about 20% or less, the stomatal flame F becomes extremely stable. Furthermore,
By concentrating the position of the entrance 5a at the center of the partition plate 5, air rises along the inner wall of the inner flame tube 2, as shown in Fig. 4a, and the wall temperature of the inner flame tube 2 decreases. By forming a reflux layer as shown in FIG. 4b, the wall temperature of the inner flame tube 2 can be made difficult to drop. Therefore, the pore flame F is stabilized, and when tar-like substances are generated and accumulated in the fuel vaporization section 10a and the amount of fuel vaporized decreases, the temperature of the pore flame F is easily formed near the air hole 2a below the pore flame F. It can be achieved under certain conditions. That is, when the amount of fuel vaporized from the fuel vaporization section 10a decreases, the air-fuel ratio becomes such that combustion is possible in the lower part of the combustion space 6, but in the conventional specification where the wall surface temperature of the inner flame cylinder 2 is low, it is difficult to form the pore flame F. However, in this embodiment, since the wall temperature of the inner flame cylinder 2 can be increased, the amount of fuel vaporized decreases, and a new pore flame as shown by F in FIG. In addition to increasing the amount of heat and recovering the amount of fuel vaporized, it also becomes possible to thermally decompose and remove the tar-like substances that had accumulated in the fuel vaporizing section 10a. As a result of combustion using white kerosene mixed with .1% by volume, the amount of combustion decreased to 70% of the initial combustion amount (fuel vaporization amount) in about 1 feeding time with the conventional specification, but with the specification of this example. So it takes about 150 to reach 70% combustion.
It takes ~18 feeding hours, and when the amount of salad oil mixed is 0.0 insect volume %, the combustion rate decreases to 70%, whereas with the conventional product it takes 2 hours, but in this example, it takes 100 days. The result was that it was extended to Partition plate 5 here
Since the partition plate 5 is a heat radiator that carries out the heat of the inner flame cylinder 2 by air flow, it is preferable to use a material with low thermal conductivity. The effect is enhanced.

Furthermore, when the amount of fuel vaporization decreases, a pomatal flame F' is formed near the fuel vaporization section 10a. More favorable effects can be expected in terms of cracking activity and heat resistance.

6 and 7 show other embodiments of the present invention. First, in the embodiment shown in FIG. Next, in the embodiment shown in FIG. 7, the peripheral edge of the entrance 5a at the center of the partition plate 5 is narrowed downward to form a downwardly extending cylindrical body 5a'. In the case shown in FIGS. 7 and 7, a part of the air flow from below as shown by the arrow is more likely to flow into the air hole 2a portion, and the flame holding in the air hole 2a portion can be made more stable.

As described above, the liquid fuel combustor of the present invention stabilizes the pore flame in the lower air hole of the inner flame cylinder and suppresses heat radiation from the inner flame cylinder, so that the combustion state is stabilized and Various problems caused by tar-like substances can be resolved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a liquid fuel combustor according to an embodiment of the present invention, FIG. 2 is a plan view of the main part thereof, and FIG.
Figures 4a and 4b are action explanatory diagrams, Figure 5 is a characteristic diagram, and Figures 6 and 7 are partially cutaway views of liquid fuel combustors according to other embodiments of the present invention. It is a front view. 1... Combustion tube, 2... Inner flame tube, 3...
...Outer flame tube, 5...Partition plate, 5a...Sekiguchi, 6...
... Combustion space, 7... Core inner cylinder, 8...
Core outer cylinder, 10...Light wick, 10a...Fuel vaporization section. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. The tip of the wick projects into the combustion space formed inside the combustion tube and between the outer flame tube, and a partition plate is provided inside the inner flame tube, and the radius of the partition plate is 2. 1. A liquid fuel combustor, characterized in that one or more openings are provided within 1/3, and the sum of the areas of the openings is 20% or less of the cross-sectional area in the horizontal direction inside the inner flame cylinder. 2. The liquid fuel combustor according to claim 1, wherein the partition plate is made of a material with low thermal conductivity such as stainless steel. 3. The air hole according to claim 1 or 2, characterized in that the air holes in the stage directly below the partition plate of the inner flame tube are arranged more densely than the air holes in other positions. Liquid fuel combustor. 4. The liquid fuel combustor according to claim 1, wherein the partition plate is inclined upward from the center toward the peripheral edge. 5. The liquid fuel combustor according to claim 1, wherein a cylinder extending downward is provided in the opening of the partition plate.