JP3100373B1 - Synthetic fuel oil generator - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To improve the combustion efficiency and to smoothly and stably burn synthetic fuel oil. A fuel oil from a fuel oil line and an additive liquid from an additive liquid line are supplied to a circulation line.
The circulation line 4 is provided with a strainer 15, a circulation pump 16, a circulation heater 18, and two stationary mixers 19 and 20. The fuel oil and the additive liquid are circulated in the circulation line 4 while being agitated and mixed by the two mixers 19 and 20 to produce a synthetic fuel oil. This synthetic fuel oil is sent to a burner 6 through a synthetic fuel oil line 5. The flow rate of the synthetic fuel oil sent to the synthetic fuel oil line 5 is
It is set to 1/3 or less, more preferably 1/10 or less of the flow rate of the synthetic fuel oil circulating in the inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic fuel oil producing apparatus for producing a synthetic fuel oil by adding an additive liquid such as water or various waste liquids to a fuel oil such as fuel oil C or waste oil, and more particularly to a combustion efficiency. The present invention relates to a synthetic fuel oil generator capable of greatly improving the synthetic fuel oil production.

[0002]

2. Description of the Related Art Conventionally, a synthetic fuel oil generating apparatus in which water is added to fuel oil to produce a so-called emulsion fuel is generally known. In this type of apparatus, fuel oil and water are generally used. A mechanical mixing device is used for the mixing.

[0003]

In the above-mentioned conventional synthetic fuel oil generating apparatus, the mixing property of fuel oil and water, particularly the size of water particles in oil at the time of emulsion fuel combustion (at the time of fuel spraying) is reduced. with too large, since a non-uniform mixed state, although NO _X and dust reducing effect of the exhaust gas is once obtained, together with the combustion efficiency decreases, not a smooth stable combustion, misfire or misfire There are problems such as.

In order to solve such conventional problems,
As a result of repeated experiments and studies by the present inventors, the water particle diameter in the oil within 1 to 3 seconds immediately before the synthetic fuel oil is sprayed from the burner is reduced to approximately 1 to 3 μm, In addition, it was found that it was only necessary to disperse them evenly in the oil.

The present invention has been made based on such knowledge, and it is possible to reduce NO _X and dust in exhaust gas and obtain higher combustion efficiency than when only fuel oil is burned. It is an object to provide a synthetic fuel oil generator.

Another object of the present invention is to provide a synthetic fuel oil generator capable of improving combustion efficiency and obtaining a more stable combustion state.

Another object of the present invention is to provide a synthetic fuel oil generator capable of improving the stirring efficiency in the mixer and stabilizing the mixing properties of the synthetic fuel oil.

Another object of the present invention is to provide a synthetic fuel oil generator capable of stabilizing the mixing ratio of fuel oil and additive liquid and obtaining a more stable combustion state.

Another object of the present invention is to provide a synthetic fuel oil generating apparatus which can easily produce a mixer and can obtain a stable fluid stirring effect.

Another object of the present invention is to provide a synthetic fuel oil generating apparatus capable of easily and reliably changing the twisted state of a portion sandwiched between two cuts of a mixer and the twisted state of another portion. To provide.

Another object of the present invention is to provide a synthetic fuel oil producing apparatus which can easily optimize a twisted state of a portion sandwiched between two cuts of a mixer and a twisted state of another portion. In providing the device.

Still another object of the present invention is to provide a composite fuel which can easily twist a plate material when manufacturing a mixer and can suppress pressure loss even if each twisted portion is not in a smoothly curved state. An oil generating device is provided.

[0013]

According to the present invention, there is provided a fuel oil line for supplying a fuel oil via a fuel pump; and an additive for supplying an additive liquid such as water or various waste liquids via an additive liquid pump. A liquid line; a circulation line having at least a circulation pump, a heater and a stationary mixer, and agitating, mixing and circulating the fuel oil from the fuel oil line and the additive liquid from the additive liquid line to produce synthetic fuel oil. When;
A synthetic fuel oil line that sends out the synthetic fuel oil generated in the circulation line; It is characterized in that it is set to 3 or less. This makes it possible to reduce NO _X and dust in the exhaust gas. In addition, since the finely divided additive liquid is uniformly dispersed in the fuel oil,
Even if the fuel oil is C heavy oil, waste oil, or the like, or if the additive liquid is various waste liquids, the complete combustion of the fuel oil becomes possible, and higher combustion efficiency is obtained than when only the fuel oil is burned. It becomes possible.

The present invention is also characterized in that the flow rate of the synthetic fuel oil sent to the synthetic fuel oil line is set to be 1/10 or less of the flow rate of the synthetic fuel oil circulating in the circulation line. . As a result, the addition liquid becomes more finely divided and uniformly dispersed in the fuel oil, so that the combustion efficiency can be improved and a more stable combustion state can be obtained.

The present invention is further characterized in that the flow rate of the synthetic fuel oil flowing in the mixer is set to 2.5 m / sec or more. Thereby, the stirring efficiency in the mixer can be improved, and the mixing property of the synthetic fuel oil can be stabilized.

The present invention is also characterized in that the fuel pump and the addition pump are constituted by a combination pump which is interlocked with each other. Thus, the mixing ratio of the fuel oil and the additive liquid can be made constant, and a more stable combustion state can be obtained.

According to the present invention, the mixer is constituted by arranging a baffle plate member in the fluid passage, and the baffle plate member is provided alternately with two cuts from both sides in the width direction of the band-shaped plate member. In addition, the plate member is characterized in that the plate member is formed by being twisted around the axis with the center in the width direction as the axis. Thus, the mixer can be easily manufactured and a stable fluid stirring effect can be obtained.

The present invention is also characterized in that two cuts are made so that one of the cuts is deeper than the other. This makes it possible to easily and surely change the twisted state of the portion sandwiched between the two cuts of the mixer and the twisted state of the other portions.

According to the present invention, the notch having a deeper cut depth is set to a cut depth substantially equal to 1/2 of the plate width of the plate material, and the notch having a smaller cut depth is set to substantially equal to one cut of the plate width of the plate material. /
The depth of cut is set to 3. Thus, the twisted state of the portion sandwiched between the two cuts of the mixer and the twisted state of the other portions can be easily optimized.

[0020] The present invention further provides an interval between two cuts,
The interval at which the cuts are provided alternately is set to be substantially the same. Thus, when manufacturing the mixer, the plate material can be easily twisted, and the pressure loss can be suppressed even if each twisted portion is not in a smoothly curved state.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a synthetic fuel oil generator according to an embodiment of the present invention.
A fuel oil line 2 for supplying a fuel oil, an additive liquid line 3 for supplying an additive liquid, a circulation line 4 for mixing and circulating the fuel oil and the additive liquid to produce a synthetic fuel oil, and a circulation line. And a synthetic fuel oil line 5 for sending the synthetic fuel oil generated in 4 to a burner 6 such as a boiler or a combustion furnace.

As shown in FIG. 1, the fuel oil line 2 includes an on-off valve 7, a fuel oil pump 8, and an integrator 9.
Fuel oil such as heavy fuel oil A, heavy fuel oil C or waste oil is supplied through the fuel oil pump 8. The additive liquid line 3 includes an on-off valve 10, an additive liquid pump 11, and an integrator 12. , Water or various waste liquids,
The liquid is supplied through the additive liquid pump 11.

Further, as shown in FIG. 1, the fuel oil pump 8 and the additive liquid pump 11 are constituted by a combination pump driven by a single motor 13 and interlocked with each other. The mixing ratio with the additive liquid is always controlled to be constant.

On the other hand, as shown in FIG. 1, the circulation line 4 is fed to a mixing line 4a for obtaining a synthetic fuel oil by stirring and mixing the fuel oil and the additive liquid and a downstream end of the mixing line 4a. A return line 4b for returning the synthetic fuel oil to the upstream end of the mixing line 4a. The mixing line 4a includes a flow meter 14, a strainer 15, a circulation pump 16, a circulation heater 18, a first mixer 19, and a 2 mixers 20 are respectively provided, and the mixers 19 and 2 are provided.
Numeral 0 is a static mixer.

As shown in FIG. 1, the return line 4b has an upstream end connected to the output side of the second mixer 20 and a downstream end between the flow meter 14 and the strainer 15. The return line 4b is provided with an inlet valve 21, an outlet valve 22, and a relief valve 23, respectively.

As shown in FIG. 1, the synthetic fuel oil line 5 is disposed between the outlet of the second mixer 20 and the burner 6, and the synthetic fuel oil line 5 Inlet flow meter 24, integrator 25, pressure reducing valve 26, solenoid valve 27,
An outlet flow meter 28 and an on-off valve 29 are provided, respectively.

The flow rate of the synthetic fuel oil flowing through the synthetic fuel oil line 5 is set to 1/3 or less, more preferably 1/10 or less of the flow rate of the synthetic fuel oil circulating in the circulation line 4. As a result, the synthetic fuel oil is supplied to both mixers 1
In steps 9 and 20, stirring and mixing can be performed many times. As a result, the particle size of the additive liquid in the synthetic fuel oil within 1 to 3 seconds immediately before the injection of the synthetic fuel oil from the burner 6 can be reduced to approximately 1 to 3 μm. The liquid can be evenly dispersed in the fuel oil.

The flow rate of the synthetic fuel oil flowing in each of the mixers 19 and 20 is set to 2.5 m / sec or more, thereby improving the stirring efficiency in each of the mixers 19 and 20. The mixing property of the synthetic fuel oil can be stabilized.

Each of the mixers 19 and 20 has the structure shown in FIG.
As shown in FIG. 2B, a cylindrical main body 30 formed of a flexible synthetic resin tube or the like is provided. In the main body 30, a baffle plate member 31 is inserted and arranged.

As shown in FIGS. 2 (c) and 3 (a) to 3 (c), the baffle plate member 3 is provided with a long cut 3 from both sides in the width direction in a plate 32 made of, for example, a thin stainless steel strip.
3a, 33b and short cuts 34a, 34b are provided alternately in pairs, and the plate material 32 is formed by twisting the plate material 32 about the center line O in the plate width direction.

Each of the long cuts 33a and 33b is shown in FIG.
As shown in (a), the cut depth is set to be approximately half the width of the plate 32, and the short cuts 34a and 34b have the cut depths of the plate 32. The length is set to approximately 1/3 of the plate width.

Further, two notches 33a, 34 forming a pair
a and 33b, 34b are, as shown in FIG.
The interval is set to _{L 1,} also cuts 33a,
33b, 34a, 34b to alternately provided spacing, i.e. spacing between the spacing and the short cuts 34b and the long incisions 33a between the short cuts 34a and long incision 33b is set to _{L 2,} respectively. And these two intervals L ₁ , L
₂ have substantially the same dimensions.

In manufacturing the baffle plate member 31, first, for example, a thin stainless steel plate is cut into a strip shape to produce a plate material 32, and a pair of cuts 33 are formed in the plate material 32.
a, 34a and 33b, 34b are provided alternately from both sides in the plate width direction. At this time, the cuts 33a, 33b, 34
The cutting depth of the long cuts 33a, 33b
Is set to be approximately １ ／ of the plate width of the plate 32, and the short cuts 34 a and 34 b are set to be approximately １ ／ of the plate width of the plate 32. In addition, each cut 33a, 33b, 34a, 34
The distances L ₁ and L ₂ between b are substantially the same.

In this manner, each cut 33 is formed in the plate material 32.
If a, 33b, 34a, and 34b are provided, the plate member 32 is twisted by a required amount around the central axis O in the width direction of the plate. Then, a baffle plate member 32 as shown in FIGS. 2A and 2B is formed.

FIG. 2A shows an example of this, and FIG.
3B shows a state in which the baffle plate member 31 is rotated about 90 degrees from the position shown in FIG.
(C) shows the plate member 32 before forming the baffle plate member 31 by twisting around the axis.

In FIG. 2C, the cuts 33b, 34
_{P 1} a member sandwiched in b, cuts 33a, the sandwiched portion at 34a _{P 2,} cuts 33b, _{R 1} a wider portion of the inter-34b, the notches 33a, the wider portion of the inter-34a and _{R 2,} these The twist directions of the portions P ₁ , P ₂ , R ₁ , R ₂ are all different directions. Therefore, after the synthetic fuel oil flows along the predetermined portions P ₁ , P ₂ , R ₁ , and R ₂ , when the synthetic fuel oil moves to the next portion P ₁ , P ₂ , R ₁ , and R ₂ , The assembly and agitation are repeated to form a turbulent flow, and sufficient agitation and mixing of the synthetic fuel oil is performed.

In addition, when the synthetic fuel oil has a predetermined portion P ₁ ,
From P ₂ , R ₁ , R ₂ , the next part P ₁ , P ₂ , R ₁ , R ₂
When the process is shifted to, the whole amount of the synthetic fuel oil is not uniformly stirred and mixed, and the portion of the synthetic fuel oil that is sufficiently stirred and mixed, the portion that is not sufficiently stirred and mixed, and almost There will be portions where no mixing takes place.
This difference in the degree of stirring and mixing is manifested as a difference in flow velocity between the respective parts, whereby mixing and mixing of the synthetic fuel oil in the front-rear direction is also performed. Moreover, each of the parts P ₁ , P
₂ , R ₁ , and R ₂ have a short length in the axial direction.
_{Even if 1} , P ₂ , R ₁ , and R ₂ do not have a smooth curved shape, the pressure loss of the fluid during stirring and mixing can be kept low.

This effect is obtained because a pair of cuts 33a, 34a and 33b, 34b are provided alternately, and cuts 33a, 34b and cuts 34a, 34 are formed.
This is because the cut length with b is different.

That is, two pairs of cuts 33a, 34
a and 33b, 34b, narrow portions P ₁ , P ₂ are formed, and these portions P ₁ , P 2
₂ , when the plate member 32 is twisted around an axis about the center line O in the plate width direction, the torsion position in the circumferential direction is different from that of the wide portions R ₁ and R ₂ . Moreover, the long cuts 33a, 33
b and the short cuts 34a and 34b have different cut depths, so that the portions P ₁ , P ₂ , R ₁ and R ₂ have a trapezoidal shape, and the narrow portions P ₁ and P ₂ have the same width. The torsional directions with the wide portions R ₁ and R ₂ are also different from each other. For this reason, the portions P ₁ , P ₂ , R ₁ , and R ₂ are different from each other around the center line O in the plate width direction and in the twist direction with respect to the center line O in the plate width direction. This is because a sufficient function can be obtained.

Each of the cuts 33a, 33b, 34a,
The depth of cut of 34b is different from each other than the same size, because the torsional directions of the narrow portions P ₁ and P ₂ and the wide portions R ₁ and R ₂ change more greatly. It is preferable that the long cuts 33a and 33b have a cut depth of approximately 1/2 of the plate width of the plate 4 and the short cuts 34a and 34b have a cut depth of 1/3 of the plate width of the plate 4. It has been confirmed by experiments by the present inventors that the most preferable twisted state can be obtained.

Thus, a pair of cuts 33a, 34b and 33b, 34b are alternately provided on both sides in the width direction of the plate member 32, and these are twisted around the axis with the center line O in the plate width direction as an axis. Since the member 31 is formed and the baffle plate member 31 is arranged in the main body 30, the manufacture is easy and a stable fluid stirring effect can be obtained.

Next, the operation of the present embodiment will be described. When the fuel oil pump 8, the addition pump 11, and the circulation pump 16 are started, the fuel oil is sent to the circulation line 4 via the fuel oil pump 8, and the addition liquid is sent to the circulation line 4 via the addition liquid pump 11. The fuel oil and the additive liquid are supplied to the circulation heater 1
After being heated in 8, the mixture is stirred and mixed in both mixers 19, 20 to produce synthetic fuel oil.

Incidentally, the fuel oil pump 8 and the additive liquid pump 11 are constituted by combination pumps driven by a single motor 13 and interlocked with each other. In conjunction therewith, the supply amount of the additive liquid also increases and decreases. Therefore, the mixing ratio between the fuel oil and the additive liquid in the synthetic fuel oil is always constant, and a stable synthetic fuel oil can be obtained.

After the fuel oil and the additive liquid are heated by the circulation heater 18, both the mixers 19 and 2 are heated.
Since the mixture is stirred and mixed at 0, a synthetic fuel oil having stable mixing properties can be obtained even when a synthetic fuel oil is produced using waste oil or various waste liquids.

Since the flow rate of the synthetic fuel oil flowing through both mixers 19 and 20 is set to 2.5 m / sec or more, even if both mixers 19 and 20 are stationary, sufficient stirring effect can be obtained. From this point, a synthetic fuel oil having stable mixing properties can be obtained.

The synthetic fuel oil thus produced is
Although it is sent to the burner 6 via the synthetic fuel oil line 5 and is provided for combustion, not all of the synthetic fuel oil on the exit side of the second mixer 20 is sent to the synthetic fuel oil line 5. Most of it is via the return line 4b and the mixing line 4
and is circulated in the circulation line 4. For this reason, the synthetic fuel oil passes through both the mixers 19 and 20 a plurality of times, and the mixing is sufficiently performed to obtain a homogeneous synthetic fuel oil having stable mixing properties. Further, when the synthetic fuel oil passes through both the mixers 19 and 20 a plurality of times, the additive liquid becomes finer and the additive liquid completely dissolves in the fuel oil. There is little possibility that the fuel oil and the additive liquid are separated.

Thus, in the circulation line, the fuel oil and the additive liquid are stirred and mixed to produce synthetic fuel oil, and the flow rate of the synthetic fuel oil sent to the synthetic fuel oil line is circulated in the circulation line. 1/3 of the flow rate of synthetic fuel oil
Since it is set as follows, NO _X in exhaust gas
And dust can be reduced. Further, since the synthetic fuel oil passes through the mixer a plurality of times, the finely divided additive liquid is evenly dispersed in the fuel oil, and even if the fuel oil is fuel oil C or waste oil, it is completely removed. Can be burned. Therefore, higher combustion efficiency can be obtained than when only fuel oil is burned.

In the above embodiment, the case where two mixers 19 and 20 are provided on the outlet side of the circulating pump 16 has been described. However, any one of the mixers 19 and 20 may be omitted. Alternatively, an arbitrary number of mixers may be provided on both sides of the circulating pump 16. Further, a mixer may be provided in the return line 4b, or the fuel oil line 2 or the additive liquid line 3 may be connected to the return line 4b.

[0049]

As described above, the present invention provides a fuel oil line for supplying fuel oil via a fuel pump; an additive liquid line for supplying an additive liquid such as water or various waste liquids via an additive liquid pump; A circulation line having a circulation pump, a heater, and a static mixer, wherein the fuel oil from the fuel oil line and the additive liquid from the additive liquid line are stirred and mixed to circulate to produce synthetic fuel oil; A synthetic fuel oil line for delivering the generated synthetic fuel oil;
Since the flow rate of the synthetic fuel oil sent to the synthetic fuel oil line is set to be 1/3 or less of the flow rate of the synthetic fuel oil circulating in the circulation line, NO _X and dust in the exhaust gas are reduced. be able to. In addition, since the finely divided additive liquid is uniformly dispersed in the fuel oil,
Even if the fuel oil is C heavy oil, waste oil, or the like, or the additive liquid is various waste liquids, etc., complete combustion of the fuel oil becomes possible, and higher combustion efficiency is obtained than when only the fuel oil is burned. be able to.

According to the present invention, the flow rate of the synthetic fuel oil sent to the synthetic fuel oil line is set to 1/10 or less of the flow rate of the synthetic fuel oil circulating in the circulation line. And the uniform dispersion in fuel oil becomes more reliable, and the combustion efficiency can be improved to obtain a more stable combustion state.

According to the present invention, the flow rate of the synthetic fuel oil flowing in the mixer is set to 2.5 m / sec or more, so that the stirring efficiency in the mixer is improved and the mixing property of the synthetic fuel oil is improved. Can be stabilized.

Further, in the present invention, since the fuel pump and the addition pump are constituted by a combination pump interlocking with each other, the mixing ratio between the fuel oil and the addition liquid is made constant, and a more stable combustion state is obtained. be able to.

According to the present invention, the mixer is constituted by arranging a baffle plate member in a fluid passage, and the baffle plate member is provided alternately in a band-shaped plate member by two cuts from both sides in the width direction. At the same time, since the plate is formed by being twisted around the axis with the center in the width direction as the axis, the mixer can be easily manufactured and a stable fluid stirring effect can be obtained.

According to the present invention, since the two cuts are formed such that one of the cuts is deeper than the other, the twisted state of the portion sandwiched between the two cuts of the mixer is improved. The torsional state of the other parts can be easily and reliably changed.

According to the present invention, the depth of cut is set to a depth of about 1/2 of the plate width of the plate material, and the depth of cut of the shallow depth is set to approximately 1% of the width of the plate material. /
Since the cutting depth is set to 3, the depth of the mixer
The twisted state of the portion sandwiched between the cuts of the book and the twisted state of the other portions can be easily optimized.

The present invention further provides an interval between two cuts,
Since the intervals at which the cuts are provided alternately are set to be substantially the same size, when manufacturing the mixer, it is easy to twist the plate material, and even if each twisted portion is not in a smooth curved state, Pressure loss can be suppressed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram illustrating a synthetic fuel oil generation device according to an embodiment of the present invention.

2A is a configuration diagram showing details of a mixer of FIG. 1, FIG.
(B) is a configuration diagram showing a state in which (a) is rotated approximately 90 degrees around the axis, and (c) is a configuration diagram showing a state of the plate material before being twisted around the axis.

3A is an explanatory view showing a plate member similar to FIG. 2C, FIG. 3B is a left side view of FIG. 2A, and FIG. 3C is a right side view of FIG.

[Explanation of symbols]

Reference Signs List 1 synthetic fuel oil generating device 2 fuel oil line 3 additive liquid line 4 circulation line 4a mixing line 4b return line 5 synthetic fuel oil line 6 burner 8 fuel oil pump 11 additive liquid pump 13 motor 15 strainer 16 circulation pump 18 circulation heater 19 1st mixer 20 2nd mixer 26 Pressure reducing valve 27 Solenoid valve 30 Main body 31 Baffle plate member 32 Plate material 33a, 33b Long cut 34a, 34b Short cut O Center line L ₁ , L ₂ interval in plate width direction L ₁ , L ₂ Interval P ₁ , P ₂ Width Narrow part R ₁ , R ₂ Wide part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-77346 (JP, A) JP-A-7-208727 (JP, A) JP-A-57-92086 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) F23K 5/12

Claims (7)

(57) [Claims] A fuel oil line for supplying a fuel oil via a fuel pump; an additive liquid line for supplying an additive liquid such as water or various waste liquids via the additive liquid pump; at least a circulation pump, a heater and a stationary mixer A circulation line for mixing and circulating the fuel oil from the fuel oil line and the additive liquid from the additive liquid line to produce synthetic fuel oil; and sending out the synthetic fuel oil produced in the circulation line. A synthetic fuel oil line, wherein the flow rate of the synthetic fuel oil sent out to the synthetic fuel oil line is set to not more than 1/3 of the flow rate of the synthetic fuel oil circulating in the circulation line , and flows through the mixer.
The synthetic fuel oil generating device is characterized in that the flow rate of the synthetic fuel oil is set to 2.5 m / sec or more . 2. The synthetic fuel oil sent to the synthetic fuel oil line has a flow rate set to 1/10 or less of the flow rate of the synthetic fuel oil circulating in the circulation line. Synthetic fuel oil generator. 3. A fuel pump and additive solution pump, synthetic fuel oils generation apparatus according to claim 1 or 2, wherein it is configured in a combination pump operatively interconnected. 4. The mixer is configured by arranging a baffle plate member in a fluid passage. The baffle plate member is formed by alternately providing two cuts from both sides in the width direction of a band-shaped plate member. claims plate material, characterized in that it is formed by twisting around the axis of the width direction central portion as an axis 1, 2
Or the synthetic fuel oil generator according to 3 . 5. The synthetic fuel oil generating apparatus according to claim 4 , wherein one of the two cuts has a deeper cut depth than the other. 6. A notch with a deeper cut depth has a cut depth of approximately ほ ぼ of a plate width of a plate material, and a cut with a smaller cut depth has a cut depth of approximately one half of a plate width of the plate material. The synthetic fuel oil producing device according to claim 5 , wherein the synthetic fuel oil generating device has a cutting depth of / 3. 7. The synthetic fuel oil generating apparatus according to claim 4 , wherein the interval between the two cuts and the interval at which the cuts are alternately set are set to substantially the same size.