JPS63108105A - Vaporizing device for petroleum burner - Google Patents

Abstract

PURPOSE:To stabilize combustion performance by providing a stabilized gas temperature at all times and improve the maximum limit of calorific value, by a method wherein the central axis of an evaporating device is slanted by a specified angle with respect to the horizontal line so that the tip end side of the outer pipe of the evaporating device is lowered. CONSTITUTION:The central axis of an evaporating device 4 is slanted by 20 deg.-45 deg. with respect to the horizontal line so that the tip end side of an outer tube 10 is lowered and an evaporated gas outlet port 18 is provided near the upper part of the rear end 11 of the side surface of the outer tube 10. Filler 24, filled into an outer peripheral evaporating chamber 23, provided in a space between the outer tube 10 and an intermediate tube 12, is filled so as to avoid the outlet port of evaporated gas. Accordingly, disturbance in oil level surface due to the inflow energy or boiling of petroleum from an oil sending pump at the maximum combustion especially and, further, a trouble which causes red-flame combustion due to the mixing of a part of unevaporized kerosene into injected gas from a nozzle 5 by the capillarity of the filler to cause primary air shortage may be prevented. According to this method, stabilized combustion may be effected even when the upper limit of the evaporating amount of kerosene is elevated and whereby the maximum calorific value may be increased.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a combustion device for liquid fuel used for heating, etc., and in particular, it gasifies kerosene in a vaporization device equipped with an electric heater, and then gasifies it through a nozzle. This article relates to a vaporization system for an oil combustor where oil is ejected into a Bunsen burner mixing tube and ignited for combustion.

[Technology Related to 1] As shown in FIG.
) is supplied to the vaporizer (4), vaporized by the built-in heater, and sent from the nozzle (5) to the burner (6).
The mixture is ejected into the mixing tube (7) and ignited and combusted in the burner (6). In addition, (8) is a solenoid that opens the on-off valve of nozzle (5), which is closed during extinguishing or preheating, during combustion, and (9) is a solenoid that returns the kerosene, which is heated and expands during preheating, into the oil tank (1). There is a return pipe provided.

FIG. 2 is a sectional view illustrating the structure of a conventional vaporizer (4) used in the combustion device shown in FIG. A metal middle tube (12) connected to the rear end (11) of a metal outer tube (10) with a bottomed tip, and a tip (13) of this middle tube (12).
The vaporizer main body is composed of a metal inner tube (16) that is joined to the bottom surface (14) of the outer tube (lO) with a gap (15) left between the inner tube (16) and the middle tube (12). An electric heating cylinder (17) is fitted into the gap between the inner tube (16), and a fuel pipe (3) connected to a fuel pump (2) is connected to the rear end of the inner pipe (16) to form a vaporizer (4). ing. In addition, the outer tube (10)
A vaporized gas outlet (18) communicating with the nozzle (5) is provided at the center of the upper part. To explain the operation, when the power switch of the oil combustor is turned on, the electric heating cylinder (
17) is started, and the temperature of the vaporizer (4) increases. When the vaporizer (4) reaches a temperature sufficient to vaporize kerosene, the heat-sensitive element (19) senses this and the control circuit (20) receives and outputs this signal, and the oil pump (2) starts, the nozzle (5) is activated by the solenoid (8).
), the discharges in the opening 2 igniters (21) occur almost simultaneously. The kerosene from the oil pump (2) is sent to the oil supply pipe (3)
The kerosene is first sent to the inner peripheral vaporization chamber (22) of the vaporizer (4) through the kerosene, where it absorbs heat from the electric heating cylinder (17) and becomes a high-temperature liquid.
) to the outer peripheral vaporization chamber (23). The kerosene that has further absorbed heat here is sequentially gasified, and is passed through the nozzle (5) through the vaporized gas outlet (18) provided at the top of the outer tube (10).
erupts towards.

The inner and outer vaporization chambers (22) and (23) are filled with a filling (24) made of metal mesh, foamed metal, or foamed ceramic to enhance heat transfer and limit the speed of the flow of kerosene. has been done. In addition.

The cylindrical vaporizer (4) is installed so that its central axis is horizontal.

[Problems to be Solved] The conventional vaporizer constructed as described above had the following drawbacks.

Figure 3 is an explanatory diagram of the vaporization state in the outer peripheral vaporization chamber (23) of the conventional vaporization device (4), where the black arrows represent the flow of liquid kerosene and the white arrows represent the flow of gasified kerosene. ing.

The vaporizer (4) is held horizontally, and the oil level is also kept almost horizontal. Note that the filler (24) is omitted for the sake of explanation.

This vaporizer can vary the amount of vaporized gas ejected from the nozzle (5), that is, the amount of combustion, by controlling the amount of kerosene delivered from the oil pump (2). When the amount of kerosene sent out is at its minimum, the kerosene heated while passing through the inner vaporization chamber (22) then moves to the outer vaporization chamber (23) and comes into contact with the middle pipe (12) heated to a high temperature. By doing so, the oil level at the boundary between liquid kerosene and vaporized gas is kept low because they are vaporized quickly and sequentially. When the amount of kerosene delivered is maximum, the kerosene comes into wider contact with the inner tube (12) heated by the heat transfer cylinder (17), increasing the amount of heat absorbed, and thus the oil level inevitably rises.

In this way, the oil level goes up and down depending on the amount burned.

When the oil level rises beyond a certain limit, the turbulence of the oil level due to boiling of kerosene and capillary action caused by the filler (24) will cause
A phenomenon occurs in which kerosene still in the form of IR gets mixed in from the vaporized waste outlet (18) and is directly jetted out from the nozzle, and at this time, red flames and unpleasant noises are generated, which adversely affects combustion performance. In order to prevent this, in conventional vaporizers, it is necessary to limit the amount of kerosene delivered to a limit that does not cause the above-mentioned disadvantages. I couldn't draw it out effectively.

[Means for Solving the Problems] The present invention eliminates the above-mentioned drawbacks, provides a vaporizer for an oil combustor, which constantly provides a stable gas temperature, stabilizes combustion performance, and improves the maximum calorific value. In order to achieve the above object, in the vaporizer according to the present invention, the vaporizer (1) is arranged so that the central axis of the device is 206~ A vaporized gas outlet (18) is provided near the upper part of the rear end (11) of the side surface of the outer tube (10) with a 45° inclination, and a metal vaporizer is installed in the outer circumferential vaporization chamber provided in the gap between the outer tube and the middle tube. It is filled with a filling made of mesh, foamed metal, or foamed ceramic, and the filling is filled so as to avoid the vaporized gas outlet.

[Example] Fig. 4 is a sectional view illustrating the structure of a combustion device using the vaporizer according to the present invention, and Fig. 5 is an explanatory diagram of the vaporization state in the outer peripheral vaporizing chamber (23) of the vaporizer according to the present invention. It is.

In the vaporizer (4) according to the present invention, the entire vaporizer (4) is tilted at an angle θ with respect to the horizontal in a clockwise direction as viewed from the drawing. Furthermore, in the main vaporizer, the vaporized waste outlet (18) is moved to the top side of the rear end of the side surface of the outer tube (10), and the outer tube (10)
0) and the middle pipe (12).
The filler (24) filled in 23) is filled in such a way as to avoid the vaporized gas outlet.

In the vaporizer constructed as described above, part of the unvaporized kerosene flows into the nozzle ( 5) It is possible to prevent troubles such as mixing with the ejected gas from the air and causing red flame combustion due to lack of air.

Incidentally, the angle of inclination is 206 to 45'' is the range determined through experiments to ensure the most stable combustion state.
If the angle of inclination is less than 2°, the effect of inclination will be weak; on the other hand, if the angle of inclination is too large, problems will occur for the following reasons.

Figure 6 shows the entire vaporizer (4) as it is (9) vertically.
This is an example of tilting by 0'. In this case, there is almost no effect of turbulence on the oil level depending on the location, and since the vaporized gas outlet (18) is located at the top of the outer vaporization chamber, even if the amount of kerosene sent out is considerably increased and the oil level rises, unvaporized kerosene will still flow out. However, this embodiment has the disadvantage of causing periodic changes in the size of combustion when the amount of kerosene delivered is small, which is undesirable. The pattern of the tungsten heating element printed on the body (17) does not cover the tip of the electric heating cylinder (17), and there is heat radiation from the bottom surface (14) of the outer tube (10).There are 9 gaps (15). In addition, due to rising hot air, etc., the temperature in the range indicated by B during preheating is lower than the temperature in the range indicated by A, which causes periodic fluctuations. When kerosene begins to flow into the outer vaporization chamber (23) after preheating is completed, the oil level rises and reaches the higher temperature area A from B, where it rapidly boils and gasifies, causing it to be ejected forcefully from the nozzle. . At the same time, the pressure in the outer peripheral vaporization chamber (23) rises and temporarily pushes down the oil level, and the oil level falls to the low temperature region B, which in turn speeds up the vaporization rate and causes the outer peripheral vaporization to occur. The pressure inside the chamber (23) also decreases, and the force of the vaporized gas blowout weakens, and at the same time, the oil level rises again and touches the high-temperature area A. By repeating this, the amount of gas ejected from the nozzle periodically fluctuates, causing pulsating combustion accompanied by unpleasant sounds, which is undesirable.In particular, this phenomenon occurs when the oil level is in both areas A and B when stable. It is near the boundary (C). This tends to occur when the amount of kerosene vaporized is relatively small.In contrast, in the embodiment of the present invention shown in FIGS. but without entering the high temperature area at the same time.

The pulsating combustion described above due to rapid gasification of kerosene is less likely to occur.

[Effects of the Invention] As described above, in the present invention, the entire vaporization device (4) is rotated clockwise at an angle of 20° to 4° with respect to the horizontal when viewed from the drawing.
The vaporized gas outlet (18) is tilted by 5 degrees, and the vaporized gas outlet (18) is connected to the outer tube (1
0) Provided on the top side of the rear end of the side surface, and an outer tube (10
) and the middle pipe (12).
3) Since the filler (24) is filled in the chamber avoiding the vaporized gas outlet, even when the oil level in the outer vaporizing chamber (23) rises considerably, especially at maximum heating power, the oil supply pump does not Due to the force of the kerosene flowing in, the disturbance of the oil level due to boiling, and the capillary action of the filling, some unvaporized kerosene may leak into the nozzle (5).
This prevents troubles such as mixing with the ejected gas from the engine and causing red-flame combustion due to lack of primary air, allowing for stable combustion and increasing the maximum calorific value even if the upper limit of kerosene vaporization amount is raised compared to conventional methods. be able to.

[Brief explanation of the drawing]

Fig. 1: Parts configuration diagram of a conventional combustion device. Fig. 2: A sectional view of a conventional vaporizer. FIG. 3: An explanatory diagram of the vaporization state in the outer circumferential vaporization chamber of the conventional vaporization device. FIG. 4: A sectional view of vaporized HFi according to the present invention. FIG. 5: An explanatory diagram of the vaporization state in the outer circumferential vaporization chamber of the vaporization device according to the present invention. Fig. 6... Explanatory diagram of the vaporization state in the outer circumferential vaporization chamber of the vaporizer according to the present invention (vertical case) 4... Vaporizer, 5... Nozzle, 17... Electric heating cylinder, 22...・Inner circumference vaporization chamber, 23... outer circumference vaporization chamber,
24...Filling. Patent applicant Dainichi Kogyo Co., Ltd. Representative Fumio Sasaki helmet illustration 3

Claims (3)

[Claims] (1) A metal middle tube connected to the rear end of a cylindrical metal outer tube with a bottomed tip, and a metal inner tube joined to the bottom of the outer tube with a gap left between the tip of the middle tube and the bottom surface of the outer tube. This constitutes the main body of the vaporizer, and the gap between the outer tube and the middle tube and the inside of the inner tube are used as a fuel vaporization chamber, and an electric heating cylinder is fitted into the gap between the inner tube and the middle tube, and an electric heating cylinder is inserted into the gap between the inner tube and the inner tube. In an oil vaporizer that has an oil pipe connected to an oil pump, the center axis of the vaporizer should be set at 20 degrees to the horizontal so that the outer pipe tip side is lowered.
A vaporizer for an oil combustor characterized by being inclined at 45 degrees. (2) The vaporizer for an oil combustor as set forth in claim 1, characterized in that one vaporized gas outlet is provided near the upper rear end of the side surface of the outer tube. (3) The fuel vaporization chamber provided in the gap between the outer tube and the middle tube is filled with a filler made of metal mesh, foamed metal, or foamed ceramic, and the filler is filled avoiding the vaporized gas outlet. A vaporizer for an oil combustor according to claim 1, characterized in that: