JPH11236582A - Premixed combustion method for different kinds of oil and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mix different kinds of oil, finely divide water droplets, and burn the oil mixture by subjecting an oil-in-water emulsion fuel to phase inversion into a water-in-oil emulsion fuel, mixing the water-in-oil emulsion fuel with a petroleum fuel, and feeding the resultant mixture to a burner. SOLUTION: An oil-in-water emulsion fuel (e.g. an emulsion obtd. by mixing petroleum-derived asphalt, water, and a surfactant, heating the mixture, and stirring it with a homomixer) is subjected to phase inversion into a water-inoil emulsion fuel by heating the oil-in-water emulsion to 100 deg.C or higher; by heating it to 80 deg.C or higher and stirring with a high-shear mixer at a shear rate of 5,000 sec<-1> or higher; or by heating it to 60 deg.C or higher and causing it to pass through an orifice with a pressure difference of 3 kg/cm<2> or higher. Thus formed water-in-oil emulsion fuel is mixed with a petroleum fuel and then fed to a burner 9. Pref., the water-in-oil emulsion fuel formed as above by phase inversion is made to have an average water drop size of 20 μm or lower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mixing and burning different types of oil. More specifically, the present invention relates to a method and an apparatus for mixing and mixing different oils in which an oil-in-water emulsion fuel and a petroleum fuel are mixed and used in a supply stage.

[0002]

2. Description of the Related Art Recently,
When an oil-in-water emulsion fuel such as orimulsion, which has been receiving attention, is used, it is considered to be used in combination with a petroleum-based fuel from the viewpoint of stable supply of the fuel and cost. Different fuels of this nature cannot simply be mixed. Therefore, if both are supplied to the combustor in separate systems, there is a disadvantage that the apparatus becomes complicated. In addition, in the case of supplying a separate system, the mixing ratio may fluctuate, and the operation of the apparatus becomes very complicated. Therefore, in the process of supplying fuels having different properties, that is, lipophilic (petroleum-based fuel) and hydrophilic (emulsion) fuel to the combustor, they are appropriately mixed and supplied to the combustor with one mixed fuel system. And the device was long-awaited.

[0003] In view of the above problems, the present inventors use both an oil-in-water emulsion fuel and a petroleum-based fuel and supply both to a combustor in the same system from the viewpoint of stable supply of fuel and cost. We studied diligently to develop a mixed oil combustion method and apparatus. As a result, the present inventors have converted the oil-in-water emulsion fuel into a water-in-oil emulsion fuel, and then mixed the fuel with a petroleum-based fuel and supplied it to a combustor, or When burning using an oil-in-water emulsion fuel and a petroleum-based fuel, both of the heated fuels are mixed and simultaneously phase-shifted to a water-in-oil emulsion fuel, and supplied to a combustor, thereby causing such a problem. I found that it could be solved. The present invention has been completed from such a viewpoint.

[0004]

That is, the first aspect of the present invention is to convert an oil-in-water type emulsion fuel into a water-in-oil type emulsion fuel, and then mix the fuel with a petroleum-based fuel. It is intended to provide a method for mixing and mixing different types of oil, which is supplied to a combustor. Here, as a method of inverting the oil-in-water emulsion fuel into a water-in-oil emulsion fuel, for example, raising the temperature of the oil-in-water emulsion fuel to 110 ° C. or more, It is preferable to raise the temperature and stir at a shear rate of 5000 s ⁻¹ or more using a high shear mixer, or to raise the temperature to 60 ° C. or more and pass through an orifice with a differential pressure of 3 kg / cm ² or more. The water droplet diameter of the water-in-oil emulsion fuel formed by the phase inversion has an average of 20 droplets.
It is preferably not more than μm.

[0005] The first invention also provides a different-oil-mixed combustion apparatus characterized by using the above-mentioned different-oil-mixed combustion method. In this heterogeneous oil mixed combustion apparatus, the supply system of the oil-in-water emulsion fuel has a pump, a heater, an orifice or a high shear mixer, and the supply system of the petroleum fuel has a pump, and the two fuels are mixed. It is preferable that a blender and a heater are provided later.

According to a second aspect of the present invention, when burning using an oil-in-water emulsion fuel and a petroleum-based fuel, the two heated fuels are mixed and simultaneously phase-shifted to a water-in-oil emulsion fuel, and And a method of mixing and burning different types of oil. Here, at the time of the mixing, for example, the temperature is raised to 60 ° C. or more, and
Preferably, the concentration of the petroleum fuel is 15% by weight or more. After the mixing, for example, an orifice treatment is performed to a differential pressure of 3 kg / cm ² or more, or a high shear mixer treatment is performed for 5000 s. It is preferable to perform stirring at a shear rate of ^-1 or more. The water droplet diameter of the water-in-oil type emulsion fuel formed by the mixing or the stirring is preferably 20 μm or less on average.

[0007] The second invention also provides a different-oil-mixed combustion apparatus characterized by using the above-mentioned different-oil-mixed combustion method. Here, the supply system of the oil-in-water emulsion fuel has a pump and a heater, the supply system of the heated petroleum fuel has a pump, and after mixing both fuels, a line blender and a heater are provided. Preferably. And it is more preferable that an orifice or a high shear mixer is provided between the line blender and the heater.

In the present invention, the combustor includes all those using oil or heavy oil as fuel, such as a boiler or a gasifier. The oil-in-water emulsion fuel may be a fuel obtained by emulsifying petroleum-based asphalt, heavy oil C, natural asphalt, bitumen, coal-based tar, and the like. On the other hand, as the petroleum-based fuel, besides heavy oil, asphalt is mainly used, and natural asphalt or bitumen may be used.

According to the mixed oil combustion method of the present invention, when an oil-in-water emulsion fuel and a petroleum-based fuel are used together, both can be supplied to the combustor in one system, so that the equipment can be simplified. In addition, the driving operation can be simplified in response to a load change or a fuel mixture ratio change during combustion. Therefore, the complexity of the operation of the device can be avoided, and the device can be operated stably. Less than,
The present invention will be described in detail.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. The present invention provides an oil-in-water emulsion fuel, after inverting a water-in-oil emulsion fuel, mixing the fuel and a petroleum-based fuel and supplying them to a combustor, or heating both fuels, This is a method in which the phase is changed to a water-in-oil type emulsion fuel at the same time as mixing, and then supplied to a combustor. Therefore, in any of the different oil mixed combustion methods, an oil-in-water emulsion (hereinafter sometimes referred to as “Φ / W heavy oil emulsion”) is used as a fuel in a water-in-oil emulsion (hereinafter “W / Φ-type”). It is necessary to change (phase inversion) the fuel. Therefore, it is important to examine under what conditions the Φ / W heavy oil emulsion is converted into a W / Φ emulsion.

Embodiment (1) Here, in order to examine preferable conditions of phase inversion in the first invention, for example, the following experiment can be performed. That is, 0.4% of polyoxyethylene nonylphenyl ether (HLB15.5) is added, and the mixture is prepared by a high shear turbine mixer. As one specific example of the Φ / W heavy oil emulsion, as a sample, a fuel of 75% concentration of Middle East asphalt (penetration 60 to 80: a measure of softness, the larger the value, the softer) is used. Measure the relationship with viscosity.

The viscosity is measured using a high temperature / high pressure type viscosity measuring system D100 / 300 manufactured by Hirch Co., Ltd. When the temperature is 100 ° C. or higher, the pressure is increased to the saturated vapor pressure of water or higher by filling nitrogen. FIG. 2 shows a viscosity curve 13 measured at each temperature in the process of increasing the temperature of the sample and a curve 12 measured at the time of decreasing the temperature. From this result, the state change occurs 100 times.
It is higher than 110 ° C., and above 110 ° C., it has been changed (phase inversion) into a water-in-oil emulsion (hereinafter referred to as “W / Φ emulsion”).

[0013] The same Φ / W heavy oil emulsion as above
Using, for example, TK homomixer type M type (special machine
Sample manufactured by Kako Co., Ltd.)
When the viscosity was measured, the results shown in FIG. 3 were obtained.
It is. From FIG. 3, 9000 s at 80 ° C.^-1At 90 ° C
Is 5000s^-13000s at 100 ℃^-1At Φ /
Phase change from W type to W / Φ type, and 110 ° C or higher
It can be seen that phase inversion occurs when the temperature rises. In FIG.
Uses an orifice in the fuel supply system shown in FIG.
Through the orifice and the differential pressure across the orifice
The relationship with the viscosity of the sample after passing is shown. Viscosity at 50 ° C
The change is small, but suddenly above a certain differential pressure above 60 ° C
Increases in viscosity. This means that from the Φ / W type, W / Φ
Suggests that a phase change occurs in the emulsion.
15kg / cm at 60 ° C^Two, 10kg / c at 70 ℃
m ^Two5kg / cm at 80 ℃^TwoAnd 3 kg at 90 ° C
/ Cm^TwoChanges to W / Φ emulsion under the conditions
You.

Under the conditions described above, the phase transition from the Φ / W heavy oil emulsion to the W / Φ type emulsion can be achieved. The W / Φ emulsion is lipophilic because oil is present around water droplets, and easily mixes with a petroleum-based fuel. From the above phase inversion conditions, in the first aspect of the present invention, the Φ / W type emulsion fuel is replaced by W
As a method of inverting the phase into the / Φ-type emulsion fuel, specifically, for example, the temperature of the oil-in-water emulsion fuel is raised to 110 ° C. or more, preferably 120 ° C. or more. In addition, oil-in-water emulsion fuel
The temperature was raised to 80 ° C. or higher, and 500
0 s ^-1 or more, preferably include stirring by 10000s ^-1 or more shear rates. Further, the temperature of the oil-in-water emulsion fuel is raised to 60 ° C. or more, and the differential pressure is 3 kg.
/ Cm ² or more, preferably 53 kg / cm ² or more. The water droplet diameter of the water-in-oil emulsion fuel formed by the phase inversion is preferably 20 μm or less on average, and more preferably 10 μm or less on average.

Therefore, in the fuel supply system of the first invention, by mixing different kinds of oil in front of the burner 9, it is possible to mix fuel with a single burner. For example, in the heterogeneous oil mixed combustion apparatus using the above-described heterogeneous oil mixed combustion method in FIG. 1, a petroleum-based fuel tank 1 and its supply pump 3, while a Φ / W emulsion tank 2 and its supply pump 4, and a heater 5 The two supplied fuels are mixed through an orifice or a high-shear mixer 6, filtered and burned by a burner 9 through a line blender 7 and a heater 8. Various valves and valves can be applied as the orifice, and the high-shear mixer 6 may be any as long as it can apply a shear of 1000 s ^-1 or more. In particular, a turbine mixer type device such as a pipeline homomixer may be used. Preferably, colloid mills and homogenizers can be used.

According to the above method or apparatus, before the Φ / W emulsion is mixed with the petroleum-based fuel, the lipophilicity is obtained by inverting the phase into the W / Φ emulsion, thereby facilitating the mixing. The atomization of water droplets also improves flammability. According to the present embodiment, it is possible to mix different types of oil with a continuous and simple piping system, so that only one system is required for the fuel supply system. Can be adjusted.

Embodiment ( No. 2) Next, in order to examine preferable conditions for phase inversion in the second invention, for example, the following experiment can be performed. That is, a test is performed using the Φ / W heavy oil emulsion used in the above embodiment (part 1) as a sample. FIG. 6 shows the relationship between the C-heavy oil concentration and the 50% average particle diameter when the Φ / W heavy oil emulsion and the C heavy oil are mixed at a temperature of 90 ° C. in the fuel supply system shown in FIG. . The average particle size is measured using, for example, a granulometer 850 (manufactured by Cirrus). In FIG. 6, when the concentration of C heavy oil exceeds 10% due to mixing, the particle size sharply increases,
At 25%, the phase changes from Φ / W to W / Φ. Further, after mixing, when passing through an orifice with a differential pressure of 5 kg / cm ² , the particle size starts increasing from 7% of C heavy oil concentration, and 15 kg
/ Cm ² causes phase inversion. As described above, it is possible to change to a W / Φ heavy oil emulsion by mixing with a petroleum-based fuel, and it is more effective to add an orifice or a high-shear mixer.

Referring to FIGS. 2 to 4, the heating conditions are as follows: 80 ° C. to 90 ° C. in the case of no stirring, 80 ° C. in the case of high shear stirring, and 60 ° C. in accordance with the orifice.
The property change of the W-type emulsion has started, and if the temperature condition or higher is applied, the Φ / W-type emulsion becomes W / Φ-type.
This indicates that the phase is easily changed to the mold. From the above phase inversion conditions, in the second aspect of the present invention, as a method of inverting a Φ / W emulsion fuel to a W / Φ emulsion fuel, specifically, for example, at the time of the mixing,
The temperature is raised to 60 ° C. or higher, preferably 80 ° C. or higher, and mixing is performed, or the concentration of the petroleum fuel at the time of mixing is 15% by weight or more, preferably 25% by weight or more. After the above mixing, an orifice treatment is further performed to obtain a differential pressure of 3 kg / cm ² or more, preferably 5 kg / cm ² or more, or a high-shear mixer treatment is further performed to 5000 s ⁻¹ or more, preferably 10,000 s ^−1.
Stirring at the above-mentioned shear rate is performed.
The water droplet diameter of the water-in-oil type emulsion fuel formed by the mixing or the subsequent stirring is preferably 20 μm or less on average, and more preferably 10 μm or less on average.

Under the above conditions, different types of mixtures and Φ /
By performing the phase inversion of the W-type emulsion at the same time and on the same line, it becomes possible to mix and mix different types of oil with a single burner. For example, in the heterogeneous oil mixed combustion apparatus using the above-described heterogeneous oil mixed combustion method shown in FIG. 5, a petroleum-based fuel tank 1 and its supply pump 3, while a Φ / W emulsion tank 2 and its supply pump 4 and a heater 5 are passed. After the two fuels are mixed, they pass through the line blender 7 and the heater 8,
It is filtered and burned by the burner 9. At this time, it is preferable that an orifice or a high shear mixer is provided between the line blender 7 and the heater 8, as shown in FIG. By adjusting the temperature and mixing ratio of the Φ / W emulsion by the above method or apparatus, it is possible to convert the phase to the W / Φ type simultaneously with mixing with the petroleum-based fuel and make the water droplet diameter small. become. Further, it is more effective to add an orifice or the like at a later stage.

Embodiment (Part 3) From the results of the above embodiment (Part 2), the following method and apparatus can be mentioned as more preferred embodiments of the second present invention. That is, in the method of the above-mentioned embodiment (part 2), the maximum mixing ratio of the Φ / W emulsion is limited to 75% or 85%, so that as shown in FIG. The mixed oil itself is circulated. The heterogeneous oil-mixed fuel exhibits the same behavior as petroleum-based fuel because of the water-in-oil emulsion, and when mixed with the Φ / W emulsion, brings about the same effect as shown in FIG. Invert the emulsion to W / Φ type. With this method, the proportion of the emulsion fuel finally supplied to the burner can be increased to around 100%.

In FIG. 7, both fuels are mixed via a petroleum fuel tank 1 and a supply pump 3 thereof, a Φ / W type emulsion tank 2 and a supply pump 4 and a heater 5, and a line blender 7 and an orifice 6 are provided. Or fed to burner 9 through high shear mixer and heater 4,
It is branched after the orifice 6 and returned to the circulation line before the petroleum fuel supply pump 3. It is even more effective if there is an orifice or high shear mixer after the heater 5. By means of the above method and apparatus, by means of means for adjusting the temperature and the mixing ratio of the Φ / W emulsion, once the W / Φ phase is circulated, the mixing ratio of the Φ / W emulsion is increased. Is now possible.

The method for mixing and mixing different types of oil according to the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the technical idea of the present invention. Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0023]

EXAMPLES Example 1 [Sample emulsion] Middle East petroleum-based asphalt (penetration of 60 to 80), water, and surfactant (polyoxyethylene nonylphenyl ether (HLB15.5)) were adjusted to a total of 300 g. Under the conditions of asphalt concentration of 75% and surfactant amount of 0.4%, each was weighed in a predetermined amount to obtain 8
The mixture was placed in a 00 ml centrifuge tube and heated to 80 ° C. After reaching a certain temperature, the mixture was stirred with a TK homomixer (with a low viscosity stirring blade) manufactured by Tokushu Kika Co., Ltd. (rotation speed: 8,000 rpm, time: 2 hours).
Min) to prepare an emulsion and store it at room temperature. [Test] The above oil-in-water emulsion was placed in a pressurized autoclave, pressurized with nitrogen (saturated water vapor pressure or higher), heated to a predetermined temperature, held for 30 minutes, and then cooled to evaluate the quality. The results are shown in Experiments No. 1 to No. 4 in Table 1 below.

In the continuous apparatus of FIG. 1, a pipeline homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) was applied to 6 and processed at a predetermined temperature and shear rate. The results are shown in Experiment Nos. 5 to 14. Next, after mixing with C heavy oil with a line blender,
The results of sampling and evaluation are shown in Experiment Nos. 15 to 17 in Tables 2 and 4 below. Similarly, other than C heavy oil,
After mixing petroleum-based asphalt, natural asphalt and bitumen with a line blender, sampling and evaluating the results, the results of Experiment Nos. 18 to 18 shown in Tables 3 and 4 below were used.
No.20. The results obtained by applying an orifice to 6 in FIG. 1 are shown in Tables 5 and 6 below.
And Experiment No. 26 in Table 6 below.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

[Table 5]

[0030]

[Table 6]

[Evaluation] In the above table, as the physical properties of the evaluation, viscosity, average water droplet diameter, and boiling atomization property were measured.
The overall evaluation was made based on the boiling atomization property related to the flammability. Even if the boiling atomization property was good, the emulsion which was still a Φ / W emulsion was evaluated as x. The viscosity was measured using a high temperature / high pressure type viscosity measuring system P100 / 300 (manufactured by Hirch), and the average water droplet diameter was measured using an optical microscope (manufactured by Nikon Corporation). The boiling atomization property was evaluated by visually observing the rupture of the sparks that occurred immediately after the sample was placed on the tip of the spatula in the Bunsen burner flame. Δ, cases that did not occur were ranked as x. It has been empirically confirmed that the flammability is good in the cases of ◎ and ○ of the boiling atomization property.

By the present method and apparatus, the Φ / W emulsion is made lipophilic by being phase-inverted to the W / Φ emulsion before being mixed with the petroleum-based fuel, thereby facilitating the mixing, and Water droplets are atomized,
Flammability is also improved. ADVANTAGE OF THE INVENTION According to this invention, mixing of different types of oils is possible with a continuous and simple piping system, so that only one system is required for the fuel supply system. it can.

Example 2 [Sample Emulsion] The same Φ / W heavy oil emulsion as in Example 1 was used. [Test] In the continuous apparatus shown in FIG. 5, the mixture was set at a predetermined temperature and a predetermined mixing ratio, sampled after the line blender 7, and the quality was evaluated. Three
The results of sampling and quality evaluation after the orifice 6 and the like shown in FIG. 1 are shown in Experiments No. 32 to No. 35 in the same table.

[0034]

[Table 7]

[Evaluation] Evaluation was performed in the same manner as in Example 1. By adjusting the temperature and the mixing ratio of the Φ / W emulsion by the method and the apparatus, it is possible to convert the phase to the W / Φ type simultaneously with mixing with the petroleum-based fuel and to make the water droplet diameter small. Became. Further, it is more effective to add an orifice or the like at the later stage.

Example 3 Sample Emulsion A Φ / W heavy oil emulsion similar to that of Example 1 and a bitumen Φ / W emulsion prepared by the same method were used. [Test] After the temperature was raised to 90 ° C. by the heater 5 in the continuous apparatus shown in FIG. 7, the mixture was mixed with C heavy oil or circulating oil at a predetermined ratio, passed through the orifice 6 in the blender 7, and then sampled after evaluating the quality of the mixed oil mixture did. The results of the asphalt emulsion are shown in Experiments Nos. 36 to 38 in Table 8 below.
The results of the bitumen emulsion were compared with those of Experiment No. 39 in the table.
It was shown to.

[0037]

[Table 8]

According to the present method and apparatus, the phase of the Φ / W emulsion is once circulated to the W / Φ type by means of adjusting the temperature and the mixing ratio, thereby obtaining the mixing ratio of the Φ / W emulsion. Can be increased.

[0039]

The method and apparatus for mixing and mixing different types of oil according to the present invention are excellent in the stable supply of fuel and cost, and are used in combination with an oil-in-water emulsion fuel and a petroleum-based fuel to be supplied to a combustor in the same system. can do. That is, according to the present invention, in a combined use of an oil-in-water emulsion fuel and a petroleum-based fuel, different types of oil can be mixed with a continuous and simple piping system, and both can be supplied to the combustor in one system. ,
Equipment can be simplified. Further, according to the present invention, mixing becomes easy and water droplets are atomized, so that the combustibility is also improved. Further, the driving operation can be simplified in response to a load change or a fuel mixing ratio change during combustion.
Therefore, the present invention has a very significant industrial significance because the complexity of the operation of the device can be avoided and the device can be operated stably.

[Brief description of the drawings]

FIG. 1 is a layout view showing one embodiment of a mixed oil combustion apparatus according to the present invention.

FIG. 2 is a diagram showing temperature-viscosity characteristics of an oil-in-water emulsion.

FIG. 3 is a graph showing the relationship between the shear rate and the viscosity of an oil-in-water emulsion.

FIG. 4 is a diagram showing the relationship between the valve differential pressure and the viscosity of an oil-in-water emulsion.

FIG. 5 is a layout view showing one embodiment of a mixed oil combustion device according to the present invention.

FIG. 6 is a diagram showing the relationship between the concentration of heavy fuel oil C and the particle diameter of oil droplets when different kinds of oils are mixed.

FIG. 7 is a layout view showing one embodiment of a mixed oil combustion device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Petroleum fuel tank 2 Φ / W emulsion tank 3, 4 Supply pump 5 Heater 6 High shear mixer 7 Line blender 8 Heater 9 Burner 10 Circulation line 11 Control valve 12 Viscosity curve measured when temperature is lowered 13 Measured when temperature is raised Viscosity curve

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masashi Hishida 2-5-1 Marunouchi, Chiyoda-ku, Tokyo

Claims (16)

[Claims] An oil-in-water emulsion fuel is phase-shifted to a water-in-oil emulsion fuel, and then the fuel and a petroleum-based fuel are mixed and supplied to a combustor. Burning method. 2. The temperature of an oil-in-water emulsion fuel is set to 1
2. The mixed oil combustion method according to claim 1, wherein the temperature is raised to 10 [deg.] C. or more and the phase is changed to a water-in-oil type emulsion fuel. 3. An oil-in-water emulsion fuel heated to a temperature of 80 ° C. or higher is subjected to 5000 s ⁻¹ using a high shear mixer.
2. The method for mixing and mixing different types of oil according to claim 1, wherein the mixture is agitated at the above-mentioned shearing speed and the phase is changed to a water-in-oil type emulsion fuel. 4. An oil-in-water emulsion fuel heated to a temperature of 60 ° C. or more is passed through an orifice having a differential pressure of 3 kg / cm ² or more to convert the phase into a water-in-oil emulsion fuel. Item 8. A method for mixing and burning different kinds of oils according to Item 1. 5. The mixed oil combustion method according to claim 1, wherein the water-in-oil type emulsion fuel formed by the phase inversion has an average water droplet diameter of 20 μm or less. 6. A heterogeneous oil mixed combustion apparatus using the heterogeneous oil mixed combustion method according to claim 1. 7. The oil-in-water type emulsion fuel supply system has a pump, a heater and an orifice or a high shear mixer, and the petroleum fuel supply system has a pump. 7. The combustion apparatus according to claim 6, further comprising a heater and a heater. 8. When burning using an oil-in-water type emulsion fuel and a petroleum-based fuel, the two heated fuels are simultaneously mixed, phase-shifted to a water-in-oil type emulsion fuel, and supplied to a combustor. Characteristic mixed oil combustion method. 9. The method according to claim 8, wherein the mixing is performed by raising the temperature to 60 ° C. or higher. 10. The petroleum fuel concentration at the time of the mixing is 1
10. The mixed oil combustion method according to claim 8, wherein the content is 5% by weight or more. 11. The mixed oil combustion method according to claim 8, wherein an orifice treatment is further performed after the mixing to obtain a differential pressure of 3 kg / cm ² or more. 12. The method for mixing and burning different oils according to claim 8, wherein a high shear mixer treatment is further performed after the mixing, and stirring is performed at a shear rate of 5000 s ⁻¹ or more. 13. The water droplet diameter of the water-in-oil emulsion fuel formed by the mixing or the subsequent stirring is 20 μm or less on average.
13. The mixed oil combustion method according to any one of items 12 to 12. 14. A mixed oil combustion apparatus using the mixed oil combustion method according to any one of claims 8 to 13. 15. A supply system for an oil-in-water emulsion fuel has a pump and a heater, and a supply system for a heated petroleum-based fuel has a pump. The heterogeneous oil mixed combustion device according to claim 14, characterized by being provided with: 16. The apparatus according to claim 15, wherein an orifice or a high shear mixer is provided between the line blender and the heater.