JPS58179709A - Combustion method using electric field - Google Patents

Abstract

PURPOSE:To increase the combustion efficiency of a burner by efficiently performing corona discharge, by spraying fuel from the injection tip at the end of an oil feed pipe, and by burning fuel with corona discharge being taken place between the injection tip and an earthed diffuser. CONSTITUTION:A heavy oil injection valve 14, having an injection tip 15 at its end, and an oil feed pipe 16 are sheathed by an electrically insulated pipe 23. and the oil feed pipe 16 is connected to a current transformer 3. One end 24 of the oil feed pipe 16 is connected to an insulated hose 25 which is connected to an oil feed pump. A swirl vane 18, through which blast is fed from a wind box 17, is provided to the outer side of the insulated pipe 23, and a diffuser 26 is fitted to the swirl vane 18 by the intermediary of a supporting plate 27. Fuel oil from the insulated hose 25 is injected from the injection tip 15, passing through the oil feed pipe 16, mixed with the air being fed into the diffuser 26 from the wind box 17 via the swirl vane, and is burned. At this time, corona discharge is taken place between the injection tip 15 and the diffuser 26, so that the combustion efficiency of a burner can be increased.

Description

[Detailed description of the invention] The present invention relates to a method for improving combustion efficiency.

For many years, Dr. Yukichi Asayo, a doctor of engineering, has published research results on applying an electric field to a burning flame to accelerate the evaporation and combustion of sprayed fuel oil. Many large companies were interested in this innovative research, but none have commercialized it.

Miura Engineering International Co., Ltd., with plans to commercialize this project, concluded a technical implementation agreement with Mr. Asayo and conducted extensive research.

An unusual phenomenon occurs when an electric field is applied to a flame. Figure 1 (-
) and as shown in Fig. 1(b), when kerosene and a piece of cloth are put in a metal ashtray (1) and lit, the flame will be about 60% of the length in the case of Fig. 1 (Fig. 1) where no electric field is applied. I can do it.

The ashtray (1) is grounded and a Pachinko Institute spherical electrode (2) is installed 50% above the kerosene surface, and this
When an electric field of 5KV is applied, the length of the flame instantly becomes 5 to 7 times longer, the flame jumps, and the color becomes white. When the electric field is switched off, it returns to its original short flame and loses its white color.

This phenomenon occurs because the application of an electric field promotes the evaporation and combustion of oil droplets.

Furthermore, as shown in Figure 2, put petroleum benzene in a beaker (4), ground the iron plate (5) at the bottom of the beaker, and lower the liquid level to 50~1.
When a 5KV field discharge lamp (2) was installed and a 15W electric field was applied to the discharge lamp, the liquid surface that was left to stand still vibrated violently.
Due to the rapid evaporation of petroleum benzene, evaporation mist adhered to the beaker wall in the form of mist, the liquid temperature decreased by 2°C, and it was confirmed that the amount of evaporation was seven times the natural evaporation amount when no electric field was applied. This is because an electric field is provided and evaporation is promoted.

It is natural that the electric field phenomena described above have various effects on oil combustion. The inventors developed the third design under the design guidance of Dr.
A test boiler (6) with an inner diameter of 0.5 mm and a length of 3 mm as shown in the figure was manufactured as a prototype. Kerosene of 3.9-1 r was sprayed from a pump (7) using a nozzle, and a variable amount of air was introduced from a blower (8). A cooling chamber (9) is provided outside the boiler,
Cooling water of 20λ/i was added using the pump (10), and the heated water was discharged from the drain pipe (11). Furthermore, a transformer (3
), an electrode (2) whose distance was variable from 20% to 150% was provided on the nozzle jet beak (15) through a conductive wire (12).

In this test boiler, a 15 KV electric field was applied to the discharge electrode located 50% away from the burner injection beak, and tests were conducted with and without an electric field applied. In the test shown in Figure 1, when an electric field is applied, the flame instantly jumps and turns white, but in the case of Figure 3, the change is much smaller than in the first test. When the electrode (2) was moved closer to 30%, the change slightly increased, but when it was moved away from the electrode (2) to 120z, almost no change was observed.

With this, there was almost no electric field effect, and I thought this was the reason why Dr. Asako's electric field technology could not be used at all for boiler combustion. We investigated the cause of no electric field effect. In general spray combustion, as shown in Fig. 5, oil is injected from the injection beak (15) at the tip of the heavy oil spray valve (14), and the injected oil is passed through the wind box (17), the swirler (18), and then the defu. The mixture is stirred with air passing through the generator (16), and then combusted with swirling air from the swirling vanes.

Because of this principle, the differential user (16) is located in front of the injection beak (15), and the discharge electrode (2) located ahead of the injection beak (15) does not cause corona discharge to the injection beak located far away.
I thought that corona might be discharged to the differential user (16) who was nearby. Just to be sure, I removed the differential user and turned on the switch, and a corona discharge occurred between the discharge electrode and the injection beak, and the flame color instantly changed to white. In other words, if the differential user is removed, a corona discharge occurs between the discharge electrode and the injection beak to promote oil evaporation and combustion, but since the differential user is in charge of mixing the sprayed oil droplets with air, It cannot be removed for driving.

Furthermore, the electric field provision method shown in FIG. 3 has the following drawbacks.

A detailed view is shown in Figure 4, but a complicated joining device (21) is required to wrap the electric wire (20) from the transformer in an insulating tube (19) such as an insulator and insert it into the can. Furthermore, the insulating tubes (19) inside the can and the solidified adhesive (22) connecting the insulating tubes are always in a high temperature atmosphere, so there is a risk of breakage. High-purity alumina was used as the insulating tube in the equipment shown in Figure 3. Although high-purity alumina has excellent heat-resistant insulation properties, its insulation properties deteriorate drastically in high temperatures of 800°C or higher, causing leakage. There is a fear. Furthermore, the insulating tube (19) and adhesive assimilate (22) are affected by high temperatures during operation and temperature changes during rest, and as described above, they were damaged three times during one month of operation. In the device shown in Figure 3, the discharge electrode and the injection beak (15)
Normal operation was impossible due to the inability to obtain efficient corona discharge between the two and frequent failures of the insulating tubes, and no improvement in combustion efficiency was achieved. Based on these experiences, the inventor developed the following technology.

Cover the heavy oil spray valve (14) with the injection beak (15) at the tip and the oil feed pipe (16) with an insulating tube (23), and install the oil feed pipe (16).
is connected to the transformer (3). One end of the oil pipe (24) is connected to an insulated synthetic resin, rubber, etc. hose (24) connected to the oil pump.
5) Connect to. A swirler blade (18) through which the wind sent from the window box (17) passes outside the insulating tube (23).
), and the defuser (26) is attached to the swirling wing via a support (27). Insulated hose (25)
The fuel oil passes through the oil pipe (16) and is injected from the jet beak at the tip, enters the window box (17), passes through the swirler (18), mixes with the air that enters from the differential user (26), and then enters the swirler. Burns with more secondary air.

At this time, the oil pipe (16) is connected to the high voltage transformer (3), and the oil pipe is wrapped in an insulated tube, and the rear end is tied to the oil pipe insulated hose (25), so corona discharge occurs. It is limited to the jet beak. Since there is a defuser at the tip of the spray beak, corona discharge occurs between the spray beak and the defuser. The differential user is grounded through the swing wing.

When this burner was installed in the boiler shown in Figure 3 and operated, the following data was obtained.

As described above, in the present invention, the oil pipe is housed in an insulated pipe, so there is no discharge from anywhere, and the discharge is limited to the jetting beak. The jet beak acts as a discharge source, creating a corona discharge between it and a grounded metal near the jet beak. This power-receiving metal may be a special pachinko-sized metal ball as shown in Figure 3, but if the defuser in front of the injection beak is grounded, corona discharge will occur between the injection beak and the defuser. There is no need to provide special equipment on the power receiving side. As shown in FIG. 6, since the insulating tube is located in a low-temperature area rather than in a high-temperature can, there is no damage or deterioration of insulation function due to temperature.

As shown in Fig. 3, there is no need to insert conductive wires or electrodes wrapped in insulating tubes into the can, so the equipment cost is low. It has many excellent features, such as the fact that the differential user is located in the front, so even if soot is generated, the jet beak is not affected much.

This oil can be applied not only to single heavy oil but also to mixed oil COM with pulverized coal.

[Brief explanation of the drawing]

Figure 1 is an illustration of kerosene combustion in an ashtray, Figure 2 is an illustration of petroleum benzene evaporation in a beaker, and Figure 3 is a diagram of a small boiler.
FIG. 4 is an explanatory diagram of the electrode section in FIG. 3. FIG. 5 is an explanatory diagram of a general spray combustor, and FIG. 6 is an explanatory diagram of a corona discharge according to the present invention. (3)...Transformer (23)...Insulation tube (
14)...Spray valve (24)...Oil pipe end (1
5)...Injection beak (25)・Insulation hose (1
6)...-Transmission tube (26)...Defusor (17)...Wind box (27)...Support (18)...Swivel wing applicant President of Miura Engineering International Co., Ltd. Mitsugu Miura

Claims (1)

[Claims] As detailed in the main text, the fuel is connected to the insulated oil supply hose, and the fuel is sprayed from the injection beak at the tip of the oil supply pipe, which is surrounded by an insulated pipe and connected to the high-voltage transformer, and between the injection beak and the grounded differential user. A combustion method using an electric field that is characterized by combustion while causing corona discharge.