JP2017223434A - Biofuel supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biofuel supply method capable of liquidizing in a short time biofuel to be solidified at normal temperature, and supplying at a cheaper price.SOLUTION: A biofuel supply method includes: preserving a tank X in which biofuel having a property of being solidified at normal temperature is accumulated as it is at normal temperature, in a preservation place; inserting into the tank, a stirring body which can generate heat itself from at least one manhole formed on a top face of the tank in the preservation place; making the stirring body generate heat and heating the biofuel from the periphery of the stirring body followed by melting and liquidizing; and a stirring step of rotating the stirring body followed by stirring the liquidized biofuel. The biofuel in the tank is entirely liquidized and taken out from the tank by heat generation and rotation of the stirring body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a biofuel supply method for supplying a biofuel having a property of solidifying at room temperature in a liquefied state, and more particularly to a biofuel supply method that is optimal for supplying biofuel to a biodiesel generator.

  2. Description of the Related Art Conventionally, many technologies related to bio-easel generators have been proposed in which a diesel engine is driven using biofuel and a generator is driven based on the driving force of the diesel engine to generate electricity. In these conventional technologies, there are mainly technologies related to the production of biofuels, and technologies related to so-called hybrid power generation in which diesel power generation using biofuels is combined with conventional power generation systems using fossil fuels such as gasoline and heavy oil A. Is almost. Specifically, the techniques shown in Patent Documents 1 to 8 shown below have been conventionally proposed.

  JP2015-83461A

  JP 2014-171301 A

  JP 2014-74147 A

  JP 2008-30915 A

  Special table 2011-514859 gazette

  Special table 2011-500418 gazette

  JP 2010-531912 Gazette

  Special table 2010-519926

  Here, the prior art described in Patent Document 1 described above relates to a hybrid electric vehicle and a method for manufacturing the same, and has a longer cruising distance, a smaller battery pack, and a lighter hybrid that uses little fossil fuel. A technique related to an electric vehicle is disclosed. Further, the prior art described in Patent Document 2 described above relates to a vehicle that uses electric power generated by thermophotovoltaic power generation that uses heat as a power source, and can travel immediately after getting on, and the travel distance is long. A technique related to an electric vehicle having a simple configuration and high energy efficiency is disclosed.

  The prior art described in Patent Document 3 described above collects used tempura oil (waste edible oil) discharged from homes and offices, removes and refines oxidized / degraded products, and uses petroleum-based kerosene. : 50 or 40:60 (kerosene 40%) mixed, 0.01 to 0.2 wt% of the specified additive, and the biofuel oil composition completely dispersed and dissolved by the ultrasonic irradiation method Discloses technology related to low-cost biofuel oil that is friendly to the global environment. The prior art described in Patent Document 4 described above generally relates to efficient power generation and efficient recovery of carbon dioxide, and specifically relates to integration of NOx emission reduction and gas turbine exhaust recirculation. A technology related to an exhaust gas recirculation power generation system is disclosed.

  The prior art described in Patent Document 5 described above is similar to the contents described in Patent Document 1 described above, and discloses a technique related to a hybrid electric vehicle, its component design, and related technologies. The prior art described in Patent Document 6 relates to a hybrid vehicle, and more particularly to a hybrid transmission mechanism (power train). An electric motor for driving a pair of wheels of the vehicle, and electric energy in the electric motor. To provide a hybrid transmission mechanism comprising energy storage means electrically connected to an electric motor for supplying electric power.

The prior art described in Patent Document 7 described above relates to biofuel, and discloses industrial distilled cashew nut shell liquid (CNSL) as one of the components of biofuel, and a technique relating to the production method and blending method thereof. doing. In addition, the prior art described in Patent Document 8 described above relates to bioconversion of carbon dioxide in a flue gas from a power plant by a photosynthetic organism. In the method for growing a photosynthetic organism, fossil fuels are used. The step comprises providing the exhaust gas from the power plant to the organism, and the gas has been desulfurized beforehand. The carbon dioxide (CO ₂ ) in the exhaust gas rises above the concentration of carbon dioxide released from the power plant. Further disclosed is a method for producing omega fatty acids and biofuels comprising the step of growing microalgae by providing exhaust gas from a fossil fuel power plant to the microalgae.

  As described above, in the technology related to the biodiesel generator that drives the diesel engine using the conventional biofuel and drives the generator based on the driving force of the diesel engine to generate power, the hybrid power generation system mounted on the vehicle is used. And how to solve the solidification state at room temperature when the fuel used is a biofuel that shows properties that solidify at room temperature. With regard to the above, it was simply a matter of constantly heating and maintaining a liquefied state.

  Certainly, when using biofuel that has the property of solidifying at room temperature, it must be liquefied beforehand when supplying biodiesel to a diesel engine. If it is always heated, including during conveyance, as in the past, the cost for that will increase. In fact, the high supply cost of this biofuel results in a high electricity bill for biodiesel power generation, and despite the remarkable effect that the exhaust gas does not contain carbon, There is a strong demand for improvement because it is a hindrance to popularization.

  The present invention has been made in view of the above circumstances, and biofuel having the property of solidifying at room temperature can be liquefied in a short time in the vicinity of the fuel supply destination and can be supplied at a lower cost. The main object is to provide a biofuel supply method that can be used.

  In order to solve the above-described problems and achieve the object, a biofuel supply method according to the present invention is the tank according to claim 1, in which a biofuel having a property of solidifying at room temperature is stored at room temperature. Storing in a storage place, inserting step of inserting a stirring body capable of generating heat into the tank from at least one manhole formed on the upper surface of the tank in the storage place, and the stirring body In the tank, the biofuel is heated and dissolved from around the agitator to liquefy it, and the agitator is rotated to agitate the liquefied biofuel. And a stirring step, and the biofuel in the tank is liquefied as a whole by heat generation and rotation of the stirring body and can be taken out from the tank.

  Thus, by configuring the biofuel supply method according to claim 1, it is possible to store biofuel at room temperature at room temperature, and to achieve a reduction in overall cost including storage cost. At the same time, when the biofuel is actually used, immediately before the biofuel in the tank is inserted, an agitator that generates heat is inserted and heated to dissolve, and the agitator is rotated and dissolved. By stirring the biofuel, the biofuel can be liquefied in a short time.

  According to the biofuel supply method of the present invention, according to the second aspect of the present invention, the method further includes a transporting step of transporting the tank storing the biofuel at the normal temperature to the storage location at the normal temperature. It is characterized by having.

  As described above, by configuring the biofuel supply method according to claim 2, the biofuel having the property of solidifying at room temperature can be transported without being heated until it is stored in the storage place. Therefore, it is possible to achieve a reduction in the overall cost including the transportation cost.

  The biofuel supply method according to the present invention may further include a landing step of landing a tank in which the biofuel is stored at room temperature from a transport ship at a port. The tank is transported to the storage location through the transport process.

  Thus, by configuring the biofuel supply method according to claim 3, it is not necessary to leave the tank storing the biofuel at room temperature and to heat it when landing the tank from the transport ship at the port. In addition, the overall cost including the landing cost can be reduced.

  The biofuel supply method according to the present invention is characterized in that, according to claim 4, the tank is loaded at room temperature in the transport ship before the landing process.

  By configuring the biofuel supply method according to claim 4 in this way, when transporting a tank storing biofuel by a transport ship, it is not necessary to leave it at room temperature and to heat it, Further, it is possible to achieve a reduction in the overall cost including the transportation cost.

  According to the biofuel supply method according to the present invention, the storage place is provided in a power plant including a biodiesel generator that generates power using the biofuel, The method further comprises a supplying step of supplying the biodiesel taken out in a liquefied state to the biodiesel generator.

  By configuring the biofuel supply method according to claim 5 as described above, it is only necessary to liquefy in a power plant that generates power using biofuel, so that the cost of further liquefying by heating the fuel can be reduced. It is possible to achieve a reduction in overall costs including the cost.

  According to a sixth aspect of the present invention, the biofuel supply method further includes a heating step of heating the tank from the outer periphery thereof.

  By configuring the biofuel supply method according to claim 6 as described above, the tank is heated more efficiently, and the number of tanks to be stored can be reduced by shortening the heating time. As a result, the overall cost including the supply cost can be reduced.

  According to the biofuel supply method of the present invention, according to the seventh aspect, in the heating step, the tank is immersed in a hot water tank filled with hot water heated to a predetermined temperature. It is characterized by being heated from the outer periphery.

  Thus, by comprising the biofuel supply method of Claim 7, a heating process can be performed more reliably.

According to the biofuel supply method according to the present invention, the hot water supplied to the hot water tank is brought to the predetermined temperature using the exhaust heat discharged from the biodiesel generator. It is characterized by being heated.

  By configuring the biofuel supply method according to claim 8 as described above, the hot water required in the heating process can be used for the exhaust heat discharged from the biodiesel generator, and the heating cost is reduced. Including, it is possible to achieve a reduction in the overall cost.

  According to a ninth aspect of the present invention, there is provided a biofuel supply method according to the ninth aspect, wherein the agitator is heated to a predetermined temperature using exhaust heat discharged from the biodiesel generator. It is said.

  Thus, by comprising the biofuel supply method of Claim 9, a stirring body can be heated efficiently.

  According to a tenth aspect of the present invention, a biofuel supply method according to the present invention is characterized in that palm oil is used as the biofuel.

  By configuring the biofuel supply method according to claim 10 as described above, inexpensive palm oil can be used as biofuel, and the overall cost including fuel procurement costs can be reduced. It becomes possible.

  As described above, according to the present invention, the biofuel having the property of solidifying at normal temperature can be liquefied in a short time in the vicinity of the fuel supply destination and can be supplied at a lower cost. A biofuel supply method can be provided.

  It is a figure which shows the procedure of one Example of the biofuel supply method concerning this invention with a photograph.   It is a front view which shows the storage state in the storage place of the ISO tank shown in FIG.   It is a block diagram which shows roughly the structure of the biofuel supply system with which the procedure of one Example of the biofuel supply method shown in FIG. 1 is applied.   It is a front view which shows the structure of the stirring apparatus used for the biofuel supply system of one Example shown in FIG.   It is front sectional drawing which shows the internal structure of the stirring body shown in FIG.   It is a longitudinal cross-sectional view which takes out and shows the flow path assembly used for the stirring body shown in FIG.   It is a cross-sectional view which shows the state which cut | disconnected the flow path assembly shown in FIG. 6 along the VII-VII line in the same figure.   It is a longitudinal cross-sectional view shown in the state which cut | disconnected the flow path assembly shown in FIG. 7 along the VIII-VIII line in the same figure.   It is a front view which takes out and shows the heating pipe assembly used for the stirring body shown in FIG.   It is a figure which shows schematic structure of the fuel system | strain especially of the diesel electric power generation system using the biofuel shown in FIG.

  Hereinafter, a procedure of an embodiment of a biofuel supply method according to the present invention will be described with reference to FIGS. 1 to 9 of the accompanying drawings.

  FIG. 1 is a photograph showing a procedure of an embodiment of a biofuel supply method according to the present invention. In this embodiment, palm oil is used as a biofuel that exhibits a property of solidifying at room temperature. This palm oil is stored in a liquefied state in an ISO tank (hereinafter simply referred to as a tank) X shown in FIG. 1 (A) in the Southeast Asian countries that are the place of origin. Thereafter, the palm oil is left at room temperature without being heated until it is transported to a storage location of a biodiesel power plant used as a fuel. As a result, in a state where the outside air temperature in the environment where the tank X is placed is lower than the solidification temperature of palm oil, the palm oil is solidified in the tank X. Of course, when the outside air temperature when the environment where the tank X is placed is higher than the coagulation temperature of the palm oil, the palm oil is liquefied in the tank X. In short, in this embodiment, the tank oil is liquefied. The palm oil in X is characterized by leaving it at room temperature without “heating”.

  More specifically, the palm oil stored in the tank X is mounted on the transport ship Y and transported from the port of origin to the port of Japan as shown in FIG. Even during transportation on the transport ship Y, the palm oil in the tank X is left unattended at room temperature.

  In addition, as shown in (C), handling of palm oil so far in a general transport ship Y is performed in a state where a tank X storing the palm oil is landed at a Japanese port, and palm oil is discharged at the port. If it is necessary to remove the tank from the tank X, the entire tank X is heated and maintained in a liquefied state throughout the transportation ship Y, or a separate heating facility is prepared at the port. It is necessary to heat the tank X landed from the transport ship Y from the outer periphery to liquefy the palm oil inside. However, in this embodiment, these heat treatments are not required at all, and therefore neither heating equipment in the transport ship Y nor heating equipment in the port is required.

  Then, the tank X unloaded from the transport ship Y is mounted on a trailer Z and is transported to a biodiesel power plant as a destination as shown in FIG. Even during land transportation, the tank X is not heated at all and is left at room temperature. After that, when the land transport of the tank X to the biodiesel power plant is completed, as shown in FIG. Of course, also in this storage place, the tank X is left at room temperature without being heated during storage.

  In addition, since the trailer Z does not have a heating facility when transported by the trailer Z, the biofuel in the tank X is removed while being transported to the biodiesel power plant after being mounted on the trailer Z at the port. There is a possibility of solidification depending on the temperature. If the biofuel is solidified in the tank X being transported, it is impossible to take out the biofuel from the tank X in a state where it has arrived at the biodiesel power plant.

For this reason, when transporting conventional biofuels, taking into account the time it takes for the biofuels to solidify, the biodiesel power plant that travels from the port is usually within one hour and at most a distance of up to two hours There was a restriction that can only be transported. In other words, the biodiesel power plant has a restriction that it can be installed only at a distance of 1 to 2 hours in terms of the travel time of the trailer Z from the port where the biofuel as the fuel is landed.

  However, in this embodiment, since the biofuel supply system 10 that heats and liquefies the tank X, which will be described later, is installed at the place where the tank X is stored in the biodiesel power station, Even if it is far away from the port, it does not cause any problems, and as a result, the installation conditions of the biodiesel power plant are greatly eased, and you can enjoy the benefits that you can basically install it in any place It is possible to achieve an advantageous effect.

  FIG. 2 schematically shows the loading state of the tank X at this storage location. Although the tank X has a well-known structure, the tank main body X1 filled with biofuel is surrounded by a frame X2, and the tank load when loaded is received by the frame X2. In the loaded state, an unnecessary load is reliably prevented from being applied to the tank body X1. In addition, a manhole X3 used when filling with palm oil is attached to the upper surface of the tank body X1, and a lid (not shown) is provided in the manhole X3 so as to be freely opened and closed. A take-off cock X4 for taking out the filled palm oil is attached to the lower part of one side surface of the tank body X1. In this embodiment, the tank X is set to a 20 kliter size, its outer size is set to L6058 × W2438 × H2591 mm, and the inner diameter of the manhole X3 is set to φ600 mm.

  As described above, the biofuel stored in the tank X stored in the loading state shown in FIG. 2 in the storage location of the biodiesel power plant is converted into the biodiesel engine 114 installed in the biodiesel power plant which will be described in detail later. In order to supply the fuel for driving, the biofuel stored in the tank X has a property of agglomerating at room temperature, and thus a process for liquefying the biofuel must be executed. Therefore, the configuration of the biofuel supply system 10 to which the procedure of one embodiment of the biofuel supply method for supplying biofuel in this embodiment is applied will be described in detail with reference to FIG.

  As shown in FIG. 3, in this system 10, the biofuel stored in the tank X and having the property of solidifying at room temperature is heated from the outer periphery of the tank X, and the biofuel stored in the tank X is heated. And the external heating subsystem 10B that is heated and melted from inside the tank X and the internal heating subsystem 10B that is liquefied in the tank X by further stirring the biofuel that has been melted and liquefied. It has two subsystems.

  The two subsystems 10A and 10B may be internally heated by operating the internal heating subsystem 10B simultaneously with the external heating by the external heating subsystem 10A, or the external heating by the external heating subsystem 10A is predetermined. After the execution of time, the internal heating subsystem 10B may be activated, and the timing is determined by a balance between the external environmental conditions such as the current outside air temperature and the time required for liquefaction. When the temperature is high, the bite fuel stored in the tank X can be heated and liquefied by using only the internal heating subsystem 10B without using the external heating subsystem 10A. Needless to say.

  First, the configuration of the external heating subsystem 10A will be described. The external heating subsystem 10A includes a hot water tank 12 in which hot water is stored and a tank X is immersed, a pump 14 and a hot water supply pipe 16 that supply the hot water to the hot water tank 12, and biofuel described in detail later. The first heat exchanger 18 that heats the hot water using the exhaust heat generated in the used diesel power generation system (hereinafter simply referred to as a biodiesel power generation system) 110 and the tank X in the hot water tank 12 are heated. A hot water return pipe 20 for returning the hot water whose temperature has been consumed to a low temperature to the first heat exchanger 18 and hot water heated by exhaust heat generated in the biodiesel power generation system 110 are supplied to the first heat exchanger 18. Pump 22 and hot water supply pipe 24, and the low temperature water returned from the hot water tank 12 in the first heat exchanger 18 to give heat to the biodiesel It is constituted by a hot water return pipe 26 back to the electric system 110.

  Since the external heating subsystem 10A is configured in this way, the exhaust heat generated in the biodiesel power generation system 110 is secondarily used to warm the hot water stored in the hot water tank 12, basically. When the biodiesel power generation system 110 is in operation, the energy required for the external heating subsystem 10A is sufficient to recycle almost the amount of heat generated from the biodiesel power generation system 110 except at the time of initial startup. Therefore, it can be said that the energy consumption is extremely low and the system is extremely economical.

  In addition, the tank X immersed in the hot water tank 12 has been loaded on the transport ship Y in a piled state as shown in FIG. 1 (B), and dirt, dust and salt adhere to the outer peripheral surface during transportation. It is dirty. And while this dirt is immersed in the hot water tank 12 and being externally heated, it peels off from the outer peripheral surface of the tank X into the hot water and causes secondary contamination of the hot water. 20 is provided with a dirt removing mechanism such as a filter (not shown), so that the hot water stored in the hot water tank 12 is always kept clean.

  The use of exhaust heat generated in the biodiesel power generation system 110 is not shown in the figure, but the hot exhaust gas from the diesel engine provided in the biodiesel power generation system 110 is given energy to the hot water with a heat exchanger. This is heated to a high temperature and supplied to the first heat exchanger 18 through the pump 22 described above. In addition, in this hot water tank 12, the biofuel liquefied in the tank X is supplied to the biodiesel power generation system 110 in a state where the hot water tank 12 is immersed in hot water. Although the biofuel in the tank X gradually decreases and the buoyancy of the tank X increases and may float in the warm water, in order to prevent the tank X from floating, A latch mechanism for fixing to the hot water tank 12 is separately provided.

  Next, the configuration of the internal heating subsystem 10B will be described. The internal heating subsystem 10B includes a heating and stirring device 30 that heats and dissolves the biofuel stored in the tank X and solidifies at room temperature from the inside, and further agitates and liquefies, and the heating and stirring device 30 A pump 32 and a hot oil supply pipe 34 for supplying hot oil to the device 30, a second heat exchanger 36 for heating hot oil using the exhaust heat generated in the biodiesel power generation system 110, and a heating and stirring device 30 The hot oil return pipe 38 for returning the hot oil whose temperature has been consumed to heat the biofuel to the second heat exchanger 36 and the heat heated by the exhaust heat generated in the biodiesel power generation system 110 The pump 40 and the hot oil supply pipe 42 for supplying the oil to the second heat exchanger 36, and the low temperature oil returned from the heating and stirring device 302 in the second heat exchanger 36 are given a heat amount to become a low temperature. Oil and a hot oil return pipe 44 back into biodiesel power generation system 110.

  Since the internal heating subsystem 10B is configured in this way, the exhaust heat generated in the biodiesel power generation system 110 is reused and supplied to the heating and stirring device 30 in the same manner as the external heating subsystem 10A described above. Since the hot oil is heated, the energy required for the internal heating subsystem 10B is basically almost the same as that of the biodiesel power generation system 110 except for the initial start-up. It is sufficient to use only the amount of heat generated from the system, and it can be said to be an extremely economical system with extremely low energy consumption.

  In this embodiment, the heating medium used in the internal heating subsystem 10B is biofuel supplied to the biodiesel engine in this embodiment, specifically, palm oil. . As a result, even if the heating medium supplied to the bladeless stirring body 46 provided in the heating and stirring device 30 leaks and enters the biofuel in the tank X, the heating medium is Since it is comprised from the palm oil which is the same material as a fuel, the remarkable effect that a substantial problem does not generate | occur | produce can be show | played.

  Next, the detailed structure of the heating stirring apparatus 30 mentioned above is demonstrated with reference to FIG. The heating and stirring device 30 heats the stirring body 46, which is described later in detail, without a blade (hereinafter simply referred to as a stirring body) 46, a rotation drive mechanism 48 that rotationally drives the stirring body 46, and the stirring body 46. A heating mechanism 50 is provided.

  The agitator 46 described above includes a hollow main body 52 having a circular cross section perpendicular to the rotation axis direction, specifically, a substantially cylindrical shape, and a shaft 54 that is integrally and coaxially connected to the main body 52. One suction port 56 provided in the center of the bottom surface as the surface of the main body 52, twelve discharge ports 58 provided on the outer peripheral surface as the surface of the main body 52, and discharge from the one suction ports 56 and 12. A flow passage assembly 60 (details are shown in FIGS. 5 to 8) connecting the outlet 58 is provided. Here, the suction port 56 is disposed at a central position closer to the rotation axis than the discharge port 58, and the discharge port 58 is disposed on an outer peripheral surface located radially outward from the rotation shaft with respect to the suction port 56. The flow passage assembly 60 is accommodated in the main body 52 as a single component, and the flow passage is defined from the internal space of the flow passage assembly 60.

  A rotation drive mechanism 48 is connected to the shaft 54 so as to be driven to rotate. Thus, as the shaft 54 is rotated by the rotation drive mechanism 48, the flow passage assembly 60 is also rotated, whereby a centrifugal force is generated in the flow passage assembly 60, and the biofuel in the flow passage of the flow passage assembly 60 is Based on the centrifugal force, the gas is discharged radially outward from the discharge port 58, that is, radially along the direction indicated by the arrow α. On the other hand, the inside of the flow passage of the flow passage assembly 60 is in a negative pressure state due to this discharge. Based on this negative pressure, the biofuel in the tank X is sucked from the suction port 56 into the flow passage assembly 60 along the rotational axis, that is, along the direction indicated by the arrow β. As described above, the agitator 46 sucks the liquefied biofuel from the suction port 56 and discharges it from the discharge port 58 to generate a biofuel circulation flow that is inverted upside down in the tank X. Since 46 itself is rotating, the upside down flow swirls and becomes complicated, whereby the biofuel is stirred in the tank X.

  On the other hand, as shown in FIG. 5 as a vertical cross-sectional shape, the main body 52 is formed in a hollow shape as a can-making structure in which sheet metal is combined, and has a substantially cylindrical shape in which an upper surface is opened and a suction port 56 is formed at the bottom center portion. The twelve discharge ports 58 are provided with a body portion 62 and a lid portion 64 which is attached in a state of closing the upper surface opening of the substantially cylindrical body portion 62 and to which the shaft 54 described above is integrally and coaxially fixed. Are arranged and formed equiangularly on the same circumference of the outer peripheral surface of the substantially cylindrical body portion 62.

  It should be noted that the outer diameter size of the stirring body 46 of this embodiment is such that this substantially cylindrical body portion 62 is used in order to achieve a stirring force sufficient to stir 20 kiloliters of liquefied biofuel filled in the tank X. In view of the above-described inner diameter of the manhole A3, which is φ600 mm, the outer diameter is set to φ500 mm, the inner diameter of each discharge port 58 is set to φ50 mm, and the inner diameter of the suction port 56 is set to φ155 mm. The rotation drive mechanism 48 is set so as to drive the stirring member 46 at 250 rpm.

  Further, as shown in FIG. 5, the bottom portion 62 </ b> A of the substantially cylindrical body portion 62 is formed in a truncated cone shape, in other words, has a tapered surface. The suction port 56 described above is formed in the center of the tapered surface of the bottom 62A.

  Here, the flow passage assembly 60 described above is formed to have an outer diameter that is tightly accommodated in the main body 52 of the stirrer 46 as shown in FIGS. A disk portion 70 formed by cutting a twelve discharge passages 66 each having an outlet connected to twelve discharge ports 58 formed on the outer peripheral surface and a central opening 68 of the same size as the suction port 56; and the disk portion 70 The upper opening is connected to the central opening 68 of the disk portion 70, and the lower opening is defined as a suction opening 72 connected to the suction port 56 described above. A cylinder 74 is provided. In other words, the flow passage in this embodiment is composed of a combination of the internal space of one cylinder 74 and the 12 discharge passages 66.

  Since the flow passage assembly 60 is configured in this way, the liquefied biofuel in the tank X is just inside the suction port 56 due to the centrifugal force generated in the flow passage of the flow passage assembly 60 as the stirrer 46 rotates. Is sucked into the cylinder 74 through the suction opening 72 located at the upper part of the cylinder 74 and reaches the disk part 70. When the disk part 70 is reached, the central opening 68 branches into twelve discharge passages 66 and radially outwards. While flowing in the radial direction, the liquid is discharged radially from the corresponding discharge ports 58 into the tank X.

  In this embodiment, the flow passage assembly 60 has been described so that the outlet of the discharge passage 66 formed in the disk portion 70 by cutting is communicated with the corresponding discharge port 58. Without being limited to such a configuration, the discharge passage 66 is defined by a pair of top plates that are spaced apart in the vertical direction and a space that is sandwiched between the top plates and is sandwiched between the top plates and adjacent to each other. Needless to say, it can be configured with twelve upper surface substantially fan-shaped spacers spaced equidistantly along the circumferential direction. However, in this case, although the cross-sectional shape of the discharge passage 66 is rectangular, there is no difference from the effect of the above-described embodiment. Needless to say, the flow passage assembly may be configured by combining a pipe having a discharge passage inside and a cylinder.

  On the other hand, as shown in FIGS. 4 and 5 again, the heating mechanism 50 described above includes a heating tube assembly 76 that is housed as a single component in the main body 52 of the stirring body 46 described above. The heating pipe assembly 76 includes a hot oil inflow pipe 78 through which hot oil as a heating medium flows from the second heat exchanger 36 as a heating medium supply source via the hot oil supply pipe 34, and a main body 52 of the stirring body 46. A hot oil outlet pipe 80 for returning the hot oil whose temperature has been reduced by heating the oil to the second heat exchanger 36 via the hot oil return pipe 38 is housed in the shaft 54. Prepared in state.

  Here, the shaft 54 is rotationally driven together with the main body 40, and the hot oil inflow pipe 78 and the hot oil outflow pipe 80 accommodated in the shaft 54 are rotated together with the shaft 54. Therefore, a rotary joint 82 for connecting the stationary hot oil supply pipe 34 and the hot oil return pipe 38 to the hot oil inflow pipe 78 and the hot oil outflow pipe 80 that correspond to each other and is driven to rotate is provided from the shaft 54. It is provided in a separate and independent state.

  On the other hand, as shown in the state taken out in FIG. 9, the heating mechanism 50 is accommodated in the main body 52 of the stirring body 46, but the space in the main body 52 is vertically moved by the disk portion 70 of the flow passage assembly 60. 7 and 8, the upper space 52 </ b> A and the lower space 52 </ b> B in the main body 52 are located at positions outside the outer peripheral region of the disk portion 70 and away from the discharge passage 66, as shown in FIGS. 7 and 8. A pair of communication holes 84 and 86 that communicate with each other are formed in a state of penetrating in the thickness direction and facing each other with the rotation center therebetween.

  Further, as shown in FIG. 9, connecting pipes 90 and 92 are provided at the lower end of the hot oil inflow pipe 78 and the lower end of the hot oil outflow pipe 80 with their upper ends connected via joints 88, respectively. The lower ends of these connection pipes 90 and 92 are connected to the upper ends of corresponding communication holes 84 and 86 via upper joints 94 and 96, respectively. The lower ends of the communication holes 84 and 86 are provided with a spiral tube 102 whose input end and output end are connected via lower joints 98 and 100, respectively, and the inside is defined as a heating passage. In order to efficiently transfer the heat generated from the hot oil flowing through the spiral pipe 102 to the main body 44, the spiral pipe 102 can be wound around the inner periphery of the main body 44 in a spiral shape to secure the surface area as much as possible. It is configured to be as long as possible.

  Since the heating mechanism 50 is configured as described above, hot oil that is a high-temperature heating medium supplied from the second heat exchanger 36 that functions as a heating medium supply source is supplied to the shaft 54 via the rotary joint 82. The hot oil inflow pipe 78 is passed through the spiral pipe 102 through the joint 88, the connection pipe 90, the upper joint 94, the communication hole 84, and the lower joint 98 in this order. The hot oil that has become low temperature due to supply is returned to the hot oil outlet pipe 80 through the lower joint 100, the communication hole 86, the upper joint 96, the connecting pipe 92, and the joint 88 in this order. In this distribution process, the heat of the hot oil is radiated from the spiral tube 102 and the main body 44 of the stirring member 46 is heated. As a result, the stirrer 46 generates heat as a whole, and the biofuel that is in contact with the outer peripheral surface of the main body 44 of the stirrer 40 is heated to be dissolved and liquefied. Then, this heat is gradually transferred to the surroundings, and the biofuel in the tank X is heated and melted by the heat from the stirring body 46 and gradually liquefies.

  As shown in FIG. 3, it is connected to a second oil feeding circuit 146 (described later) functioning as a biofuel supply pipe connected to a take-off cock X4 attached to the tank X. Then, the biofuel heated in the tank X and liquefied is supplied to the diesel power generation system 110 using the biofuel via the second oil feeding circuit 146.

  The configuration of the fuel system, particularly to the diesel engine 114 of the diesel power generation system 110 as a supply destination to which the biofuel liquefied in the tank X is supplied by the biofuel supply system 10 configured as described above will be described below. .

  FIG. 10 shows a fuel system in a diesel power generation system 110 using biofuel supplied with biofuel liquefied by the biofuel supply system 10 described above. The diesel power generation system 110 includes a first oil storage tank 112 that stores 650 liters of palm oil as biofuel, for example, corresponding to a daily consumption amount, and the biofuel supplied from the first oil storage tank 112. In this embodiment, for example, a diesel engine 114 that exhibits an output of 750 kw and a generator 116 that generates electric power with the driving force of the diesel engine 114 are basically provided.

In this embodiment, specifically, palm oil used as biofuel is RBD palm stearin oil shown in Table 1 below.

  The diesel engine 114 is driven at a desired high efficiency under a predetermined temperature condition in which the biofuel is in a first temperature range, specifically, a temperature range of 80 ° C to 100 ° C. The optimum temperature that brings out the high efficiency fluctuates depending on the temperature, humidity, atmospheric pressure, etc. within this first temperature range, but the correlation has already been clarified and known based on the past results. Description is omitted.

  In addition, the system 110 connects the first oil storage tank 112 and the diesel engine 114, and is interposed between the first oil feeding circuit 118 through which biofuel flows and the first oil feeding circuit 118. A first oil pump 120 that feeds biofuel in one oil storage tank to the diesel engine 116, and a portion downstream of the first oil pump 120 of the first oil feed circuit 118; The biofuel sent by the first oil pump 120 is heated to a second temperature range set lower than the first temperature range described above, specifically, a temperature range of 60 ° C to 80 ° C. The first fuel heater 122 is further provided.

  In this embodiment, the first fuel heater 122 uses hot water heated by utilizing the exhaust heat discharged from the diesel engine 114 described above, and circulates this hot water and the first oil feeding circuit 118. It is configured to heat the biofuel by exchanging heat with the biofuel. Thus, since the first fuel heater 122 is heated by heat exchange with the hot water, the amount of heat is sufficient, so there is no fear that the amount of heat for heating will be insufficient, but the time constant is Long and fine temperature control is difficult.

  In view of this, the first oil feeding circuit 118 includes a second fuel heater 124 that finely heats the biofuel flowing through the circuit portion in a portion between the first fuel heater 122 and the diesel engine 114. Further, a temperature sensor 126 for measuring the temperature of the biofuel immediately before flowing into the diesel engine 114 is interposed immediately upstream of the diesel engine 114 in the first oil feeding circuit 118. . And this system 110 carries out the 2nd fuel heater 26 based on the measurement result of the temperature sensor 126, and the biofuel which flows into the diesel engine 114 is 80 to 100 degreeC which this is in a 1st temperature range. A control device 128 is further provided for controlling so as to be maintained in between.

  Specifically, the second fuel heater 124 includes an electric heater whose heat generation state is interrupted under the control of the control device 128, and finely heats the biofuel immediately before being supplied to the diesel engine 114. In other words, biodiesel accurately maintained at the target temperature is supplied to the diesel engine 114. Here, the electric heater constituting the second fuel heater 124 is attached to the outer peripheral portion of the pipe constituting the first oil feeding circuit 118 between the first fuel heater 122 and the diesel engine 114. It is attached with.

  On the other hand, although not shown, the temperature sensor is attached to a portion immediately upstream of the diesel engine 114 of the first oil feeding circuit 118 and can measure the temperature of the biofuel immediately before flowing into the diesel engine 114. It is made like that. Then, the control device 128 causes the second fuel heater 124 to set the temperature of the biofuel immediately before flowing into the diesel engine 114 to a predetermined temperature between 80 ° C. and 100 ° C. that is the first temperature range. It is configured to control to keep constant. The control device 128 also controls the diesel engine 114 and the generator 116, but a description thereof is omitted here.

  Further, the electric heater constituting the second fuel heater 124 divides the portion of the first oil feeding circuit 118 between the first fuel heater 122 and the diesel engine 114 into a plurality of parts, specifically in this embodiment. In, for example, it is arranged in a state of being divided into three parts, and each of the divided parts 124A to 124C is configured to be heated independently. The control device 128 is configured to control the heat generation in the divided portions 124A to 124C independently. In other words, the control device 128 does not drive the electric heater 124 to generate heat based on the measurement result of the temperature sensor, or controls the heat generation of at least one divided portion 124A, 124B, 124C of the three divided portions 124A to 124C. Is configured to do. As described above, the control device 128 of this embodiment appropriately generates heat by dividing the electric heater 124 so that the biofuel flowing through the first oil feeding circuit 118 becomes the target temperature more accurately. Will be able to be heated.

  In addition, the first oil storage tank 112 described above is arranged to heat the biofuel stored in the first oil storage tank 112 to a third temperature range lower than the second temperature range, for example, 50 ° C. to 70 ° C. Has been. In the same manner as the first fuel heater 122 described above, the third fuel heater 130 uses the hot water heated by the exhaust heat from the diesel engine 114 to convert the biofuel in the first oil storage tank 112 into the first fuel heater 130. 3 for heating to a temperature range of 3.

  Here, since various devices for stably supplying biofuel to the diesel engine 114 are interposed in the first oil feeding circuit 118 described above, an outline will be described below.

  First, a first return circuit 132 is connected between the first oil storage circuit 118 and the first oil storage tank 112 between the first oil storage circuit 112 and the first oil storage pump 112. The first return circuit 132 is provided with a fine filter 134 for removing, for example, 10 μm foreign matter. Further, a continuous automatic backwash filter 136 is interposed downstream of the portion of the first oil feeding circuit 118 where the first fuel heater 122 is interposed. A second return circuit 138 is connected between the continuous automatic backwash filter 136 and the first oil storage tank 112 described above, and a sludge collector 140 is interposed in the second return circuit 138. ing.

  Furthermore, a first switching valve 142 is interposed downstream of the continuous automatic backwash filter 136 of the first oil feeding circuit 118, and between the first switching valve 142 and the diesel engine 114, A first flow meter 144 is interposed. The first flow meter 144 is connected to the control device 128, and the measurement result is used as a control factor for biofuel supply control in the control device 128. Further, the temperature sensor 126 described above is disposed immediately upstream of the diesel engine 114 and between the first flow meter 144. Note that the first switching valve 142 is configured to be switched and controlled by the control device 128 described above.

  On the other hand, in the first oil storage tank 112 described above, the ISO tank X in which 20 kiloliters of biofuel corresponding to consumption for a plurality of days, for example, 3 days, is stored via the second oil feeding circuit 146. The take-out cock X4 is connected. As already described with reference to FIG. 2, the tank X has a fuel supply system 10 when it is necessary to replenish the first oil storage tank 112 with biofuel from the situation where it is stored in the storage location. Is supplied in a liquefied state. The second oil feeding circuit 146 is provided with a second oil feeding pump 150 that feeds the biofuel liquefied in the tank X to the first oil storage tank 112. Further, a double filter 152 is interposed in a portion immediately upstream of the second oil feed pump 150 of the second oil feed circuit 146.

  Here, the external heating subsystem 10A and the internal heating are performed so that the biofuel liquefied by heating in the tank X has a fourth temperature range lower than the third temperature range described above, for example, 35 ° C. to 60 ° C. The subsystem 10B is controlled.

  The fourth temperature range is set higher than the melting point of palm oil used as biofuel in this embodiment. Specifically, palm oil has a melting point of 27 ° C. to 50 ° C., and the melting point varies depending on the content of fatty acid such as stearic acid, but is mainly in the range of 35 ° C. to 40 ° C. It has a melting point. In view of this fact, in this embodiment, the fourth temperature range is set to 35 ° C. to 60 ° C., and the palm oil as the biofuel stored in the second oil storage tank 148 does not coagulate and reliably. It is designed to maintain liquidity. Moreover, since the fourth temperature range is set to a minimum temperature range so that the palm oil does not solidify, the palm oil is effectively prevented from being deteriorated at a high temperature even during long-term storage. It will also be effective.

  The diesel engine 116 is connected to a third oil feeding circuit 156 for returning surplus biofuel discharged from the diesel engine 116 to the first oil storage tank 112. Since the biofuel discharged from the diesel engine 116 has a high heat of 300 ° C. or higher in the third oil feeding circuit 156, when the biofuel is returned to the first oil storage tank 112 as it is, Since there is a possibility that the biofuel stored in the oil storage tank 112 is unnecessarily exposed to high heat and deteriorated at a high temperature, the first oil supply circuit 156 reduces the temperature of the biofuel being fed. A cooler 158 is interposed. The first cooler 158 is configured to cool the biofuel by, for example, using normal temperature water such as well water, tap water, or industrial water as cooling water and exchanging heat with the cooling water. Has been.

  Further, a portion between the diesel engine 114 and the first cooler 158 of the third oil feeding circuit 156, and the first fuel heater 122 and the diesel engine 114 of the first oil feeding circuit 118 described above. More specifically, a fourth oil feeding circuit 160 is disposed to connect the portion between the continuous automatic backwash filter 136 and the portion between the first switching valve 142. The fourth oil feeding circuit 160 is provided with a first pressure regulating valve 162 that opens at a predetermined pressure. In other words, in this embodiment, when the biofuel fed through the first oil feeding circuit 118 is boosted to a predetermined pressure or higher, the first pressure regulating valve 162 is opened and the first oil feeding is performed. The biofuel in the circuit 118 is returned to the third oil feeding circuit 156, further cooled by the first cooler 158, and then returned to the first oil storage tank 112. Sex is guaranteed.

  On the other hand, the system 110 has a low-temperature ignitability and is used as a fuel when the system 110 is started, and stores a heavy oil A used as a flushing material for washing the diesel engine 114 when the system 110 is terminated. An oil storage tank 164 is further provided. In the third oil storage tank 164, A heavy oil having the same capacity as the biofuel in the first oil storage tank described above is stored. Further, a fifth oil feeding circuit 166 that connects the third oil storage tank 164 and the first switching valve 142 described above and through which the A heavy oil flows is provided. The fifth oil feeding circuit 166 is provided with a third oil feeding pump 168 that feeds the A heavy oil stored in the third oil storage tank 164 to the diesel engine 114. Further, a double filter 170 is interposed between the third oil storage tank 164 and the third oil feed pump 168 of the fifth oil feed circuit 166.

  Here, the control device 128 described above activates the third oil feeding pump 168 at the time of starting and at the end, performs the first switching valve 142, and inputs from the first oil feeding circuit 118 (i.e., biotechnology). Switching to switch the fuel oil from the third oil storage tank 164 to be supplied to the diesel engine 114 by closing the fuel inflow) and opening the input from the fifth oil feeding circuit 166 (that is, the fuel oil A inflow). It is set to control. On the other hand, the control device 128 stops the third oil feeding pump 168 during the steady operation other than at the time of starting and stopping, makes the first switching valve 142, and inputs from the fifth oil feeding circuit 166. Is closed, the input from the first oil feeding circuit 118 is opened, and switching control is performed so that biofuel is supplied from the first oil storage tank 112 to the diesel engine 114.

  Further, a second switching valve 172 is interposed in a portion of the third oil feeding circuit 156 described above on the downstream side of the diesel engine 114. A second flow meter 173 for measuring the flow rate of the fuel discharged from the diesel engine 114 is interposed between the diesel engine 114 and the second switching valve 172 of the third oil feeding circuit 156. Has been. The second flow meter 173 is connected to the control device 128 in the same manner as the first flow meter 142, and the measurement result is used as a control factor of the diesel engine 114 in the control device 128. The second switching valve 172 is configured to be switched by the control device 128 described above. The second switching valve 172 and the third oil storage tank 164 are connected to a sixth oil supply circuit 174 for returning surplus A heavy oil discharged from the diesel engine 114 to the third oil storage tank 164. Yes.

  Here, at the time of starting and stopping, the control device 128 causes the second switching valve 172 to close the output to the third oil feeding circuit 156 and open the output to the sixth oil feeding circuit 174. In addition, the switching control is performed so that the heavy fuel oil A discharged from the diesel engine 114 flows through the sixth oil feeding circuit 174, and on the other hand, the second switching valve 172 is set in the steady operation other than the start time and the stop time. The output to the third oil feeding circuit 156 is opened, the output to the sixth oil feeding circuit 174 is closed, and the biofuel discharged from the diesel engine 114 flows through the third oil feeding circuit 156, It is set to perform switching control so as to be returned to the first oil storage tank 112.

  Further, the sixth oil feeding circuit 174 is provided with a second cooler 176 for lowering the temperature of the A heavy oil being fed. Similar to the first cooler 158 described above, the second cooler 176 is configured to cool the A heavy oil by exchanging heat with the cooling water.

  On the other hand, the portion between the first switching valve 142 and the third oil feed pump 168 of the fifth oil feed circuit 166 described above, and the downstream side of the second cooler 176 of the sixth oil feed circuit 174. Are connected by a seventh oil feeding circuit 178. The seventh oil feeding circuit 178 is provided with a second pressure regulating valve 180 that opens at a predetermined pressure. Thereby, in this embodiment, when the A heavy oil fed by the fifth oil feeding circuit 166 is increased to a predetermined pressure or higher, the second pressure regulating valve 180 is opened and the fifth oil feeding circuit is opened. The heavy oil A in 166 is returned to the third oil storage tank 164 via the sixth oil feeding circuit 174, and safety is ensured.

  The sixth oil feeding circuit 174 is provided with a third switching valve 182 that is switched and controlled by the control device 128. Further, the system 110 includes a recovery tank 184 that recovers a mixture of flushed A heavy oil and biofuel discharged from the diesel engine at the time of stop, and a first tank that connects the recovery tank 184 and the third switching valve 182. 8 oil feeding circuits 186 are further provided. At the time of start-up, the control device 128 causes the third switching valve 182 to close the output to the eighth oil supply circuit 186, open the output to the sixth oil supply circuit 174, and from the diesel engine 114. Switching control is performed so that the discharged A heavy oil flows through the sixth oil feeding circuit 174 and is returned to the third oil storage tank 164. On the other hand, at the time of stoppage, the third switching valve is operated as 82, 8th. The output to the oil supply circuit 186 is opened, the output to the sixth oil supply circuit 174 is closed, and the mixture of the flushed A fuel oil and biofuel discharged from the diesel engine 114 is supplied to the eighth oil supply circuit. It is set to perform switching control so as to be collected in the collection tank 184 via the circuit 186.

  As described above, since the biofuel supply method of this embodiment is configured, the biofuel consumed in one day is stored in the first oil storage tank 112, while being stable in the first oil storage tank 112. In order to be able to supply biofuel efficiently, the tank X storing biofuel for three days is connected to the first oil storage tank 112 via the second oil feeding circuit 146. . As a result, even if the biofuel supply is stopped for two to three days for some reason, the system 110 can continue to generate power without problems and continue to supply electricity.

  In addition, the tank X heats the biofuel stored in the tank X in the fourth temperature range so that the biofuel does not solidify and exhibits a liquid state, and prevents deterioration at high temperatures. In this way, the biofuel consumed by being supplied from the first oil storage tank 112 to the diesel engine 114 in accordance with the operation of the second fuel pump 150 from the tank X is reliably supplied to the first oil storage tank 112. Will be replenished.

  In this way, the biofuel supply system 10 reliably supplies sufficient biofuel to the first oil storage tank 112 to be consumed on that day.

  Needless to say, the present invention is not limited to the configurations and numerical values of the above-described embodiments, and can be variously modified without departing from the gist of the present invention.

  For example, in the above-described embodiments, it has been described that palm oil is used as biofuel. However, the present invention is not limited to using palm oil, and in short, biofuel having a property of solidifying at room temperature. Needless to say, anything can be applied.

  In the above-described embodiment, the first oil storage tank 112 has been described as having a capacity of 650 liters. However, the present invention is not limited to such a value, and the output of the diesel engine is not limited. Needless to say, it will change accordingly.

  In the embodiment described above, the capacity of the tank X has been described as having a capacity 30 times that of the first oil storage tank 112. However, this is only a guideline for one tank X, and the storage location includes Since 12 tanks X are stored in advance, and the tank X is heated to liquefy the biofuel that has solidified inside, one working day per day is sufficient, Needless to say, it does not cause any problems.

  Further, in the above-described embodiment, it has been described that one diesel engine 114 is arranged. However, the present invention is not limited to such a number of arrangements, and the point is that it corresponds to the required power generation capacity. Needless to say, it is important to obtain the engine output, and the number of the engine can be freely selected.

  In the above-described embodiment, the electric heater constituting the second fuel heater 124 has been described as being divided into three parts. However, the present invention is not limited to such a structure, and includes a structure that is not divided. It goes without saying that the number can be set arbitrarily.

  As described above, according to the biofuel supply method of the present invention, biofuel can be stored at room temperature at room temperature, and overall costs including storage costs can be reduced. Immediately before actually using the biofuel, an agitator that generates heat is inserted into the biofuel in the tank and heated to dissolve it, and the dissolved biofuel is rotated by rotating the agitator. By stirring, the biofuel can be liquefied in a short time, and its applicability is immeasurable.

X ISO tank X1 Tank body X2 Frame X3 Manhole X4 Take-off cock Y Transport ship Z Trailer 10 Biofuel supply system 10A External heating subsystem 10B Internal heating subsystem 12 Hot water tank 14 Pump 16 Hot water supply pipe 18 First heat exchanger 20 Hot water Return pipe 22 Pump 24 Hot water supply pipe 26 Hot water return pipe 30 Heating and stirring device 32 Pump 34 Hot oil supply pipe 36 Second heat exchanger 38 Hot oil return pipe 40 Pump 42 Hot oil supply pipe 44 Hot oil return pipe 46 Blade Stirring body 48 without rotation mechanism 50 Heating mechanism 52 Main body 54 Shaft 56 Suction port 58 Discharge port 60 Flow path assembly 62 Substantially cylindrical body part 62A Bottom part 64 Cover part 66 Discharge path 68 Central opening 70 Disc part 72 Suction opening 74 Cylinder 76 Heating pipe assembly 78 Hot oil inflow pipe 80 Hot oil outflow pipe 8 2 Rotary joint 84; 86 Communication hole 88 Joint 90; 92 Connection pipe 94; 96 Upper joint 98; 100 Lower joint 102 Spiral pipe 110 Diesel power generation system 112 First oil storage tank 114 Diesel engine 116 Generator 118 First oil supply Circuit 120 First oil feed pump 122 First fuel heater 124 Second fuel heater 124A-124C Divided electric heater 126 Temperature sensor 128 Control device 130 Third fuel heater 132 First return circuit 134 Precision filter 136 Continuous automatic backwash filter 138 Second return circuit 140 Sludge collector 142 First switching valve 144 First flow meter 146 Second oil feed circuit 150 Second fuel pump 152 Dual filter 154 Fourth fuel heater 156 3 oil supply circuit 158 first Rejector 160 Fourth oil feeding circuit 162 First pressure regulating valve 164 Third oil storage tank 166 Fifth oil feeding circuit 168 Third oil feeding pump 170 Double filter 172 Second switching valve 173 Second flow meter 174 Sixth oil supply circuit 176 Second cooler 177 Second flow meter 178 Seventh oil supply circuit 180 Second pressure regulating valve 182 Third switching valve 184 Recovery tank 186 Eight oil supply circuit

Claims (10)

A storage process in which a biofuel having properties that solidify at room temperature is stored in a storage place at a storage tank.
An insertion step of inserting a stirring body capable of generating heat from the at least one manhole formed on the upper surface of the tank in the storage place into the tank;
A liquefaction step in which the stirrer is heated, and the biofuel is heated and dissolved from around the stirrer in the tank to be liquefied;
A stirring step of rotating the stirring body to stir the liquefied biofuel;
Comprising
A biofuel supply method characterized in that the biofuel in the tank is liquefied as a whole by heat generation and rotation of the stirring member and can be taken out from the tank.   The biofuel supply method according to claim 1, further comprising a transporting step of transporting the tank storing the biofuel at the normal temperature to the storage location at the normal temperature. A tank for storing the biofuel at room temperature, and a landing process for landing from a transport ship at a port;
The biofuel supply method according to claim 2, wherein the landed tank is transported to the storage location through the transporting process.   The biofuel supply method according to claim 3, wherein the tank is loaded at room temperature in the transport ship before the landing process. The storage location is provided in a power plant equipped with a biodiesel generator that generates power using the biofuel,
The biofuel supply method according to claim 1, further comprising a supply step of supplying biofuel extracted in a liquefied state in the tank to the biodiesel generator.   The biofuel supply method according to claim 5, further comprising an external heating step of heating the tank from the outer periphery thereof.   The biofuel supply method according to claim 6, wherein, in the heating step, the tank is heated from the outer periphery by being immersed in a hot water tank filled with hot water heated to a predetermined temperature.   The biofuel supply method according to claim 7, wherein the hot water supplied to the hot water tank is heated to the predetermined temperature using exhaust heat discharged from the biodiesel generator.   The biofuel supply method according to claim 1, wherein the agitator is heated to a predetermined temperature using exhaust heat exhausted from the biodiesel generator.   The biofuel supply method according to any one of claims 1 to 9, wherein palm oil is used as the biofuel.