JP5519999B2 - Petroleum fuel / biofuel mixed supply equipment - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport-equipped petroleum-based fuel / biofuel mixed supply device for mixing and supplying biofuel to petroleum-based fuel to an engine of a transport machine such as an automobile or a ship.

  Conventionally, in order to reduce global greenhouse gases, there has been a demand for improvements in engine fuel for automobiles. As one of the improvement measures, bioethanol has been used for petroleum-based fuels such as gasoline and light oil that have been used in the past. The use of a biofuel mixed fuel obtained by mixing biofuel such as biodiesel has been proposed.

  However, in general, biofuels are easily oxidized, have high hygroscopic properties, and are easily frozen, so they become inferior as fuels due to oxidation. The fuel supply line has the disadvantage of affecting the engine as well as the engine.

  Therefore, conventionally, as a vehicle-mounted mixed supply device that supplies light oil and biofuel mixed to an automobile engine, light oil and biofuel are stored in separate tanks, and light oil and biofuel are electrically pumped from these tanks. In order to prevent freezing of biofuel that passes through the biofuel tank, mixing tank, and other accessory devices, it is composed of a heater, a heat medium supply pipe, etc. It has been proposed to equip a warming device.

  However, in the proposed apparatus as described above, not only the whole apparatus is large and heavy, but also expensive, and an improvement in this point is eagerly desired as an apparatus mounted on an automobile.

  It is an object of the present invention to provide a transport-equipped petroleum-based fuel / biofuel mixed supply device that is smaller and lighter than a conventional proposed device and can be provided at low cost as a device to be mounted on a transport aircraft. .

As means for solving the above problems, the present invention
A transport tank with an engine 9 is equipped with a main tank 17 containing petroleum fuel, a biofuel tank 25 containing biofuel, and a mixing tank 15 for quantitatively supplying the petroleum fuel and biofuel and mixing them, and the engine 9 , the fuel suction pipe 4 to which the suction pressure is applied by the feed pump 2 in order to supply the fuel to the engine 9 , and the return to which the discharge pressure is applied by the feed pump 2 in order to send the surplus fuel to the outside. A fuel discharge pipe 11 is extended to each of the fuel intake pipe 4 , a mixed fuel supply pipe 13 for supplying the mixed fuel of the mixed tank 15 to the engine 9 by suction pressure, and a petroleum-based fuel of the main tank 17. a petroleum fuel supply pipe 14 for supplying to the engine 9 by suction pressure and connected freely switched via a three-way solenoid valve a, which is connected to the discharge pipe 11 yuan 20 is connected to one end of a measuring instrument heating pipe 41 penetrating into the measuring instrument 30 and connected to the other end of the heating pipe 41. The front end of the connected warming return pipe 42 is connected to one end of a filter warming pipe 43 penetrating into the filter 31, and the warming return pipe 44 connected to the other end of the warming pipe 43 is connected. The tip is connected to one end of a biofuel tank heating pipe 45 penetrating into the biofuel tank 25, and the tip of a heating return pipe 46 connected to the other end of the heating pipe 45 is connected to the mixing tank 15. Connected to one end of the mixing tank heating pipe 47 penetrating into the heating tank 47, the tip of the heating return pipe 48 connected to the other end of the heating pipe 47 is connected to the return fuel source pipe 21, and the return fuel source The pipe 21 selectively directs the return fuel to the mixing tank 15 or the main tank 17 by the discharge pressure. A transportation-equipped petroleum-based fuel / biofuel mixed supply device is proposed in which a return return pipe 23 and a return pipe 24 are connected to each other via a three-way solenoid valve C so as to be switched.

  According to the transporter-equipped petroleum-based fuel / biofuel mixed supply device of the present invention, means for supplying mixed fuel from the mixing tank and petroleum-based fuel from the main tank to the engine, respectively, and return fuel to the mixing tank or main tank Since the suction pipe and the discharge pipe using the suction pressure and the discharge pressure of the feed pump of the engine are used as the return means, compared with the conventional apparatus using an electric pump or the like, the apparatus is reduced in size and weight, Furthermore, cost reduction can be realized. In addition, it is possible to sufficiently prevent freezing of biofuel that is easily frozen in cold weather by a simple heating means that causes the residual heat of the return fuel from the engine to act through the heating tube. Since the discharge pressure of the feed pump is also used for the return fuel flow, it is possible to further reduce the size, weight and cost.

1 is a circuit diagram of an apparatus for mixing and supplying petroleum fuel and biofuel according to the present invention. It is a basic diagram of a diesel engine system. It is an expansion longitudinal cross-sectional view of a mixing tank. It is explanatory drawing of the mixing ratio management system of petroleum fuel and biofuel.

  The biofuels used in the present invention are roughly classified into biodiesel and bioethanol. The former is made from raw materials such as rapeseed, soybean, and palm palm, and the latter is a sugar raw material such as sugar cane and sugar beet. Some are made from starchy raw materials such as corn and cassava.

A description will be given of an example implemented in a light oil / biodiesel mixed supply device mounted on a truck with a diesel engine below a mixed supply device .
First, in the diesel engine system (1) shown in FIG. 2, the pipe connected at one end to the fuel suction port (3) of the feed pump (2) is used as a fuel suction pipe (4) having suction pressure. 1) Fuel is injected through a fuel delivery pipe (8) extending from one side to the outside and connected to the discharge port (5) of the feed pump (2) and the fuel inlet (7) of the injection pump (6). The fuel is sent to the pump (6), and the fuel is injected into each cylinder of the diesel engine body (9) by driving the injection pump (6). The surplus fuel is temporarily supplied to the relief valve (10) of the injection pump (6). Is connected to the outside from the other side of the engine system (1) as a return fuel discharge pipe (11) having a discharge pressure. In the present invention, the suction pressure of the fuel intake pipe (4) is used for supplying fuel to the engine, and the discharge pressure of the return fuel discharge pipe (11) is used for supplying fuel to the mixing tank or main tank. The

  In FIG. 1, one end of a main pipe (12) is connected to the fuel suction pipe (4), and the mixed fuel supply pipe (13) and the other end of the main pipe (12) are connected via a three-way solenoid valve (A). The light oil supply pipe (14) is branched, and one of the mixed fuel supply pipes (13) is mixed with the other light oil supply pipe (14) in the mixed fuel (16) of light oil and biofuel in the mixing tank (15). Are respectively extended in the light oil (18) in the main tank (17). (19) is a strainer connected to the main pipe (12).

One end of a main pipe (20) is connected to the return fuel discharge pipe (11), and the other end of the main pipe (20) is connected to a return fuel main pipe (21) and a heater via a three-way solenoid valve (B). The return pipe (22) is branched, and the mixing tank return pipe (23) and the main tank return pipe (24) are branched from the tip of the return fuel main pipe (21) via the three-way solenoid valve (C). The tip of the return pipe (23) extends into the mixing tank (15), and the tip of the main tank return pipe (24) extends into the main tank (17).
The front end of the mixing tank return pipe (23) extends to the vicinity of the bottom of the tank, and the tank is stirred and mixed by the discharge pressure of the return fuel.

  The biofuel tank (25) containing the biofuel (26) is installed at a position higher than the mixing tank (15), and other than the main pipe (27) having one end connected to the bottom of the biofuel tank (25). The measuring pipe (28) and the biofuel supply pipe (29) are branched from the end via the three-way solenoid valve (D), and the measuring instrument (30) is connected to the tip of one measuring pipe (28), and the other bio The tip of the fuel supply pipe (29) is put into the mixing tank (15). (31) is a filter connected to the main pipe (27). The capacity | capacitance of the said measuring device (30) is 250 cc as an example.

  The three-way solenoid valve (A) opens the pipes (12) and (14) when energized, and returns to the opening of the pipes (12) and (13) when not energized. The three-way solenoid valve (B) The three-way solenoid valve (C) opens the pipes (20), (22) when energized and returns to the opening of the pipes (20), (21) when not energized. The three-way solenoid valve (D) opens the pipes (21) and (23) when not energized, and opens the pipes (28) and (29) when energized. Returning to the opening of (27) and (28).

Mixing amount management device A mixing amount management device that supplies the light oil (18) and the biofuel (26) to the mixing tank (15) at a constant rate (for example, a biofuel concentration of 5%) will be described. First, the mixing tank (15) will be described. In FIG. 3, a cylindrical wave blocking cylinder (32) whose upper end is closed and whose lower end is opened is centered in the mixing tank (15), and the tank upper plate is suspended from the lower end of the cylinder close to the bottom of the tank. A stem (35) which supports the upper float switch (33) and the two lower float switches (34) and (34a) below the upper float switch (33) and slidably up and down in the wave blocking cylinder (32). ) Is suspended from the upper end plate (36).

  The stem (35) has one shaft supporting the upper float switch (33) and two shafts supporting the two lower float switches (34) and (34a) in a bifurcated shape. The upper float switch (33) is slidable up and down a small distance between the upper stopper (37) projecting from the stem and the stem 2 or the upper stopper (37). The lower float switches (34), (34a) are slidable up and down between the stem 2 or the lower stoppers (38), (38a). 38) and (38a) are simultaneously switched on when touching.

  FIG. 4 shows a main part of the gas oil and biofuel mixture amount management device using the float switches (33), (34), and (34a) as described above. The lower float switches (34), (34a) are self-holding type switches each having a self-holding circuit (39), (39a), and one of the lower float switches (34) is the three-way solenoid valve as shown in the figure. In addition to being connected to (A), the upper float switch (33) is connected to the self-holding circuit (39).

  The other lower float switch (34a) is connected to the three-way solenoid valve (D) and a timer (40) for controlling the energization time of the solenoid valve (34a) to 1 to 2 minutes as an example.

  Now, about 18 liters of mixed fuel obtained by mixing biofuel with light oil at a ratio of 5% is put in the mixing tank (15) in advance. When the engine is started, the mixed fuel in the mixing tank (15) is sucked from the suction pipe (4) through the supply pipe (13), the solenoid valve (A), and the main pipe (12). Is sucked into the engine. At the same time, surplus mixed fuel in the engine is discharged from the discharge pipe (11) by the discharge pressure of the main pipe (20), solenoid valve (B), return fuel main pipe (21), solenoid valve (C), return pipe (23). Then, the oil level in the mixing tank (15) is gradually lowered.

  As an example, when about 5 liters of mixed fuel is consumed by the engine, the lower float switches (34), (34a) in the mixing tank (15) are turned on in contact with the lower stoppers (38), (38a). Assuming that the float switch (34) sends an ON signal to the solenoid valve (A) to switch the solenoid valve (A) to the opening of the pipes (12) and (14). ) To stop the mixed fuel supply to the engine, and instead, the light oil is sucked and supplied from the main tank (17) to the engine through the supply pipe (14), the solenoid valve (A), and the main pipe (12). The solenoid valve (A) maintains the pipes (12) and (14) opened by the self-holding circuit (39).

  At the same time, surplus light oil in the engine passes from the discharge pipe (11) to the main pipe (20), the electromagnetic valve (B), the return main pipe (21), the electromagnetic valve (C), and the return pipe (23) to the mixing tank ( Return to 15).

  On the other hand, when the lower float switch (34a) is turned ON, the ON signal is sent to the solenoid valve (D) to switch the solenoid valve (D) to the opening of the pipes (28) and (29). 30) The biofuel (250 cc) in the tank is put into the mixing tank (15) by a drop through the measuring pipe (28), the solenoid valve (D), and the supply pipe (29). Meanwhile, the opening of the pipes (28) and (29) is held by the self-holding circuit (39a).

  At the same time, the timer (40) starts counting the set time (1 to 2 minutes) in response to the ON signal of the lower float switch (34a), and the biofuel in the meter (30) is supplied to the entire supply pipe (29). After counting out, the counting is terminated, the self-holding circuit (39a) is released by the signal, the solenoid valve (D) is returned to the original pipes (27) and (28), and the head is dropped from the tank (25). Restart the biofuel flow into the meter (30).

  When 250 cc of biofuel introduced into the mixing tank (15) is mixed with light oil supplied back from the engine to the mixing tank (15), the amount increases while the mixed fuel increases by about 5 liters. The upper float switch (33) comes into contact with the upper stopper (37) and is turned ON, and the ON signal is sent to the self-holding circuit (39) of the lower float switch (34) to release the self-holding and the solenoid valve (A) To the opening of the pipes (12), (13), thereby shutting off the light oil suction supply from the main tank (17) to the engine, and instead from the mixing tank (15) through the pipes (13), (12) The engine is switched to suction supply of mixed fuel of light oil and biofuel (about 5%) to the engine.

Anti-freezing device An apparatus for preventing freezing of biofuel and mixed fuel at the time of cold will be described below. In FIG. 1, the tip of the warming return pipe (22) branched from the main pipe (20) connected to the discharge pipe (11) via the electromagnetic valve (B) is connected to the measuring instrument (30). Connected to one end of the measuring instrument heating pipe (41) penetrated in the inside, and the tip of the heating return pipe (42) connected to the other end of the heating pipe (41) is connected to the inside of the filter (31). The end of the heating return pipe (44) connected to one end of the filter heating pipe (43) penetrated into the heating pipe (43) is connected to the biofuel tank (25). And connected to one end of the biofuel tank heating pipe (45) penetrated through the heating tank (45), and the tip of the heating return pipe (46) connected to the other end of the heating pipe (45) is connected to the mixing tank (15). A heating tank return pipe (48) connected to one end of the mixing tank heating pipe (47) penetrating inside and connected to the other end of the heating pipe (47). Tip connected to the return fuel source pipe (21) of the solenoid valve from said original pipe (21) (C), and returned to the mixing tank return line mixing tank via (23) (15).

  An outside air temperature sensor is installed outside the mixing tank (15). When the outside air temperature falls below the freezing temperature of the mixed fuel, it is detected and a signal is sent to the solenoid valve (B) to send a pipe (20 ), (22) is switched to open, and surplus fuel having residual heat discharged from the discharge pipe (11) is thereby transferred to the main pipe (20), the solenoid valve (B), the return pipe (22), (42), ( 44), (46), each meter (30), filter (31), tank (25) due to residual heat while being circulated through the heating tubes (41), (43), (45), (47) The biofuel and mixed fuel in (15) are heated to prevent freezing.

Measures for long-term stoppage during extreme cold Next, safety measures for placing the engine in the cold for a long time with the engine stopped will be described. If left in the cold for a long time, the mixed fuel remaining in the pipelines such as the main pipe (12), the suction pipe (4), and the pipe in the engine system will freeze, so it is necessary to remove this before stopping the engine. is there.

  Therefore, a self-holding monitor switch and timer for switching the solenoid valve (A) are installed in the driver's seat, and a mixed fuel temperature sensor for switching the solenoid valve (C) is inserted into the mixed fuel of the mixing tank (15). Before the engine is stopped, the monitor switch is turned on, and the solenoid valve (A) is switched to the opening of the pipes (12) and (14) according to the signal, and the state is self-maintained, and the timer Is started to count for about 1 to 2 minutes, and during that time, the mixed fuel remaining in the pipeline is consumed by the engine. When the set time of about 1 to 2 minutes has elapsed, the engine ignition electric circuit is shut off by the signal, and the engine is stopped. The next engine start is now ready for light oil drive.

  After a long time in cold air, the biofuel tank (25), the filter (31), the biofuel in the meter (30), and the mixed fuel in the mixing tank (15) are frozen and accordingly The fuel temperature sensor in the mixing tank (15) switches the solenoid valve (C) to open the pipes (21) and (24), and the outside air temperature sensor outside the mixing tank (15) also switches the solenoid valve (B). When the engine is started with the pipes (20) and (22) opened, the light oil in the main tank (17) passes through the pipe (14), solenoid valve (A) and pipe (12) to the engine. The surplus light oil having the residual heat discharged from the discharge pipe (11) is supplied to the pipe (20), solenoid valve (B), pipe (22), heating pipe (41), pipe (42), heating Warm tube (43), tube (44), warming tube (45), tube (46), heating And distributed to the pipe (47) starts the heating of biofuel and mixed fuel frozen. The surplus light oil that has heated the mixing tank (15) is returned to the main tank (17) through the pipes (48), (21), the solenoid valve (C), and the pipe (24).

  When the mixed fuel in the mixing tank (15) rises to a temperature at which there is no risk of freezing, the monitor switch is released and the solenoid valve (A) is returned to the pipes (12) and (13). When the solenoid valve (C) is returned to the opening of the pipes (21) and (23) by the signal of the sensor and the outside air temperature outside the mixing tank (15) rises to a temperature at which the mixed fuel does not freeze, the outside air temperature The sensor senses it, and returns the solenoid valve (B) to the opening of the pipes (20) and (21), thereby returning to the mixed fuel supply state.

  Therefore, when the engine is started, the mixed fuel in the mixing tank (15) is sucked and supplied to the engine via the pipe (13), the electromagnetic valve (A), and the pipe (12), and is discharged from the discharge pipe (11). The mixed fuel is returned to the mixing tank (15) through the pipe (20), the electromagnetic valve (B), the pipe (21), the electromagnetic valve (C), and the pipe (23).

An apparatus for preventing temperature rise of a mixed fuel A description will be given of a mixed fuel cooling apparatus that is required in high seasons such as summer. In the example shown in FIG. 1, a finned cooling pipe (49) is connected in the middle of the return fuel main pipe (21), and surplus fuel having residual heat discharged from the discharge pipe (11) is branched by the electromagnetic valve (B). Cooling is performed through a finned cooling pipe (49) through a main pipe (21), and the cooled fuel is returned to the mixing tank (15) through a solenoid valve (C) and a pipe (23).

  As another example of the cooling pipe, an air cooling apparatus or a cooling pipe with a water cooling apparatus that causes cooling air or cooling water to act on the cooling pipe is also used. In this case, there are a type in which cooling air or cooling water is always applied to the cooling pipe from the air cooling apparatus or the water cooling apparatus, and a type in which cooling air or cooling water is applied to the cooling pipe from the air cooling apparatus or the water cooling apparatus when necessary.

  In FIG. 3, (50) is a drop lid floated on the surface of the mixed fuel oil, which is useful for preventing ripples and oxidation.

DESCRIPTION OF SYMBOLS 1 Diesel engine system 4 Fuel intake pipe 11 Fuel discharge pipe 13 Mixed fuel supply pipe 14 Light oil supply pipe 15 Mixing tank 17 Main tank 23 Mixing tank return pipe 24 Main tank return pipe 41 Measuring instrument heating pipe 43 Filter heating pipe 45 Bio Fuel tank heating tube 47 Mixing tank heating tube

Claims (1)

A transport tank with an engine 9 is equipped with a main tank 17 containing petroleum fuel, a biofuel tank 25 containing biofuel, and a mixing tank 15 for quantitatively supplying the petroleum fuel and biofuel and mixing them, and the engine 9 , the fuel suction pipe 4 to which the suction pressure is applied by the feed pump 2 in order to supply the fuel to the engine 9 , and the return to which the discharge pressure is applied by the feed pump 2 in order to send the surplus fuel to the outside. A fuel discharge pipe 11 is extended to each of the fuel intake pipe 4 , a mixed fuel supply pipe 13 for supplying the mixed fuel of the mixed tank 15 to the engine 9 by suction pressure, and a petroleum-based fuel of the main tank 17. a petroleum fuel supply pipe 14 for supplying to the engine 9 by suction pressure and connected freely switched via a three-way solenoid valve a, which is connected to the discharge pipe 11 yuan 20 is connected to one end of a measuring instrument heating pipe 41 penetrating into the measuring instrument 30 and connected to the other end of the heating pipe 41. The front end of the connected warming return pipe 42 is connected to one end of a filter warming pipe 43 penetrating into the filter 31, and the warming return pipe 44 connected to the other end of the warming pipe 43 is connected. The tip is connected to one end of a biofuel tank heating pipe 45 penetrating into the biofuel tank 25, and the tip of a heating return pipe 46 connected to the other end of the heating pipe 45 is connected to the mixing tank 15. Connected to one end of the mixing tank heating pipe 47 penetrating into the heating tank 47, the tip of the heating return pipe 48 connected to the other end of the heating pipe 47 is connected to the return fuel source pipe 21, and the return fuel source The pipe 21 selectively directs the return fuel to the mixing tank 15 or the main tank 17 by the discharge pressure. A transportation-equipped petroleum-based fuel / biofuel mixed supply device connected to a return return pipe 23 and a return pipe 24 via a three-way solenoid valve C in a switchable manner.

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