Waste oil impregnated fuel production system

Abstract

[Problem] To provide a system for producing a composite fuel comprising a waste oil-impregnated wood material chip having a light specific gravity by kneading a waste oil O together with a waste wood material chip C formed from a waste wood material, forest thinnings or the like. [Configuration] The present invention comprises a step for transporting a waste oil O using a drum D, a step for pulverizing a waste wood material to feed a waste wood material chip C, a step for kneading the waste oil O together with the waste wood material chip C, and a step for conveying a composite fuel M prepared by the kneading of the waste oil O together with the waste wood material chip C. In the step for kneading the waste oil O together with the waste wood material chip C, a cylindrical tank 410 and a U-shaped impeller 420 are provided, in which the U-shaped impeller 420 is provided with a pair of upper and lower agitating blade members 421 and 422 which extend from the central rotation axis 411 of the tank 410 in a radial direction of the tank and rotate in the horizontal direction and an agitating blade member 423 which extends in a vertical direction connecting the edge parts of the pair of agitating blade members 421, 422 to each other and slides the peripheral surface, and the U-shaped impeller 420 has an agitating blade space through which an agitation flow of the waste oil O and the waste wood material chip C pass.

Description

[Technical field]

[0001] The present invention relates to a waste oil impregnated fuel production system that converts waste oil into a low-cost, highly practical fuel. [Background technology]

[0002] "Waste oil," one type of industrial waste, refers to used oil discharged from all industries, such as lubricating oil, insulating oil, cleaning oil, cutting oil, waste solvents, and tar pitch. It is always collected and disposed of in highly corrosion-resistant drums, but to reuse it as fuel, it is necessary to remove water and sludge at a waste oil recycling plant through processes such as oil-water separation and centrifugation. Most waste oil suitable for recycling, including engine oil-based waste oil, is commercialized as recycled heavy oil, but chlorine-based metal processing oil and water-based waste oil that are unsuitable for recycling are generally incinerated after oil-water separation.

[0003] On the other hand, many technical proposals and practical applications have been made for fuels made from waste materials themselves or waste materials, such as waste wood and wood pellets. Technical proposals have also been made for unused or underutilized plant resources such as thinned wood and waste wood. For example, in Patent Document 1, in order to omit the pre-crushing process in using waste wood as fuel and to reduce the capital investment and operation and maintenance costs required in the process, waste wood is inserted into the furnace through the furnace wall in the shape of dismantled wood that has been separated and dismantled, and burned.

[0004] When using thinned wood, etc., in order to use the moist green wood as fuel, it is necessary to perform a certain drying process beforehand. If the cost of drying can be reduced when turning moist plant resources such as green wood into fuel, not only will it be possible to effectively use resources, but it will also contribute to the reduction of greenhouse gas emissions, which is required on a global scale. Furthermore, if the cost of drying can be reduced not only for green wood and plant resources but also for moist objects that can be burned or incinerated, it will increase the usability of these as fuel, and the technology described in Patent Document 2 has been proposed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-28409 A

[0006] [Patent Document 2] Utility Model Registration No. 3160673 Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, in the present invention, the use of waste oil as fuel requires appropriate treatment, and the treatment costs are high. On the other hand, while it is possible to burn wood, such as waste wood and thinned wood, water-containing plant resources such as green wood require drying treatment to turn them into fuel, and they are still insufficient for use as a highly practical fuel.

[0008] In light of the problems with the conventional technology, the present invention aims to provide a system for producing usable fuel from waste, which makes it possible to actively utilize waste that is otherwise difficult to think of as fuel, and which also serves as a low-cost waste disposal technology. [Means for solving the problem]

[0009] As a result of investigating the above-mentioned problems, the inventors discovered that if waste wood is crushed into sawdust-like wood chips and then mixed with waste oil in a certain ratio, the waste wood chips act as a combustion aid, forming light-weight waste oil-impregnated fuel chips with excellent combustibility, which can be actively used as fuel. Based on this discovery, the inventors completed the present invention.

[0010] The present invention is a system for producing waste oil-impregnated fuel chips having a light specific gravity of, for example, about 0.8 to 1.0 by mixing waste oil O with wood chips C formed from waste wood, thinned wood, etc., in a volume ratio of several times the amount of wood chips to the waste oil, and the system includes a process for transporting the waste oil O in a drum D, a process for supplying wood chips C containing waste wood formed by crushing the waste wood, a process for mixing the waste oil O with the wood chips C, and a process for transporting a waste composite fuel M obtained by mixing the waste oil O with the wood chips C, In the step of kneading the waste oil O and the wood chips C, a mixing tank kneading means 400 is provided with a cylindrical tank 410 and a preferably U-shaped mixing blade 420 consisting of a pair of horizontally rotating mixing blade members 421, 422 extending from a central rotation shaft 411 in the radial direction of the tank and a circumferential surface sliding mixing blade 423 extending in the vertical direction connecting the ends of the mixing blade members, a waste oil transporting and supplying means 100 is provided with an electric hoist 110 having an inverting machine 120, and is configured to suspend a drum can D containing collected waste oil O, transport the drum can D to the upper part of the mixing tank 410 by the electric hoist 110 traveling on an erected ceiling rail R, invert the suspended drum can D by the inverting machine 120, and discharge and input the waste oil O from the drum can D, and a waste oil transporting and supplying means 100 is provided with an upper funnel-shaped portion 310 located above the mixing tank kneading means 400, and is configured to receive the waste oil O discharged from the inverted drum can D and to supply the waste oil O to the mixing tank 410. The waste oil treatment system is characterized in that it includes a waste oil injection chute 300 for injecting waste oil into the mixing tank 410, a waste wood chip injection hopper 200 located above the mixing tank kneading means 400 and equipped with a receiving port 210 opening obliquely forward, which receives wood chips C formed by crushing waste wood, thinning materials, etc. from a bucket B or the like and sends them to the mixing tank 410 below, and preferably the hopper is equipped with an inclined surface 212 that vibrates via a grating 211, and further equipped with a drive mechanism 500 below the mixing tank 410 for rotating at a low speed the mixing blades 411 in the mixing tank 410 in which the waste oil O and the wood chips C are mixed, and preferably the drive mechanism 500 has a cyclo reducer 510, and after the waste oil O and the wood chips C are mixed, a composite fuel M consisting of waste oil-impregnated wood chips is received from the bottom of the mixing tank and transported to the accumulation tank 700 by a belt conveyor 600 and accumulated therein. In the present invention, the wood chips C are mainly waste wood chips produced from waste wood and thinned wood. However, it may also be possible to add oil-absorbing waste materials such as dried grass and waste paper, which have the same combustion promoting properties as wood. Effect of the Invention

[0011] According to the present invention, waste oil O, which is waste collected in drums, can be mixed with wood chips C, which are also waste materials, such as waste wood and thinned wood, to produce waste composite fuel M with a specific gravity of about 0.8 to 1.0 and excellent combustion characteristics. These composite fuels can be used not only as direct fuel, but also as a combustion aid for burning waste materials that were previously difficult to imagine as fuel, such as used diapers and waste plastic products, and can be used as highly practical fuel. Moreover, this can also be used as a low-cost or zero-cost waste disposal technology, and can simultaneously realize low-cost or zero-cost heat production and waste disposal, making it highly useful.

[0012] In addition, waste oil is usually collected in drums because it is highly corrosive, so it is difficult to dump it into a mixing tank using a rubber hose. Therefore, an excellent method for treating waste oil in drums is to lift and transport the drums themselves using an electric hoist equipped with a turnover mechanism, and dump the drums into a mixing tank through a funnel-shaped waste oil chute.

[0013] Furthermore, in order to form a composite fuel M consisting of waste oil-impregnated wood chips C with a specific gravity of about 0.8 to 1.0 by mixing several times the amount of wood or waste wood chips C, for example 2 to 5 times the volume of the waste oil O, in the stirring tank 410, the stirring tank 400 has a stirring blade 420 that revolves horizontally around a rotating shaft 410 that rotates at a low speed in the center of the stirring tank 400, and this horizontally revolving stirring blade is preferably configured as a U-shaped stirring blade 420 having a pair of upper and lower horizontally revolving two blades 421, 422 that extend in the radial direction of the tank from the central rotating shaft 411 and are arranged at a distance in the circumferential direction, revolving in a horizontal plane, and consisting of a vertical blade 423 that slides on the inner circumference of the tank connecting the ends of each of the two blade members, through which the stirring flow flows between the two blades. This pair of upper and lower horizontally rotating twin blades 421, 422 have an inclined surface on the front side in the direction of rotation that is inclined at 30 to 60 degrees from the horizontal plane, and are arranged at intervals above and below on the rotating shaft 411 and rotated horizontally, while the upper horizontally rotating stirring member 421 is arranged 30 to 60 degrees behind the lower horizontally rotating stirring member 422 in the direction of rotation by the above-mentioned inclined surface angle, and both ends are connected to the ends of the upper and lower stirring members, and a vertical stirring blade 423 that slides on the circumferential side of the stirring tank is provided.In the cylindrical stirring tank 410, an ideal stirring motion can be obtained for kneading wood chips C, including waste wood, at a volume ratio several times that of waste oil using the specially shaped stirring blades. That is, as shown in Fig. 3(c), the stirring blade 420 has two inclined surfaces 422a, 423a that slide on the bottom surface and the circumferential surface of the stirring tank, and on the one hand, the action (A) of the inclined surface 422a digs up solid wood chips from the bottom upward, and on the other hand, the action (B) of the inclined surface 423a causes a two-way stirring action such that the solid wood chips are gathered inward from the circumferential surface by the action (B), and further, the rise of the kneaded material formed in the tank is leveled by the action (C) of the upper horizontal rotating blade member 421. Also, according to the present invention, above the stirring tank 410, a drum D containing collected waste oil O is suspended and transported by an electric hoist 110 running on a ceiling rail R installed, and the suspended drum D is turned over by a turnover machine 120, and the waste oil O is discharged and poured from the drum D into the stirring tank 410, so that the waste oil transporting means 100 is provided, which is preferable for transporting waste oil.

[0014] Furthermore, according to the present invention, in one batch mixing, several times as much, for example 400 liters to 5 times as much, 1000 liters or more of wood chips C are added to mix and knead the waste oil, which is usually 200 liters. Therefore, above the mixing tank 410, there is a waste oil injection chute 300 with a funnel-shaped section 310 at the top, which receives the waste oil O discharged from an inverted drum D and inputs it into the mixing tank 410, and a wood chip input hopper 200 that receives the waste wood chips C formed by crushing waste wood, thinning materials, etc., at a receiving port 210 that opens diagonally forward with a bucket B or the like, receives them on a vibrating inclined surface 212 via a grate 211, and sends them to the mixing tank 410 below, which is preferable for mixing and kneading a large amount of waste oil and waste wood chips. [Brief description of the drawings]

[0015] [Figure 1] This is a conceptual diagram showing the overall configuration of the waste oil impregnated composite fuel production system of the present invention. Above the agitator 400 are arranged an electric hoist 110 for transporting waste oil in a drum, a waste oil input chute 300 for receiving the transported waste oil, and a hopper 200 for inputting waste wood chips to be mixed with the waste oil. Below these are arranged a drive mechanism 500 for low-speed agitation, and the overall configuration for removing the waste oil-impregnated wood chips M mixed by the agitator from the agitator tank and transporting them on a conveyor 600. [Diagram 2] In the side view (a) and front view (b) of the tipping machine attached to the electric hoist that transports the waste oil in the drum to the agitator position, a rotating shaft 122 that clamps the center of the drum body and a curved member 122a that holds the drum body are provided at the tip of the hanging hook 121, and the drum is turned via the worm gear 123a by the rotation of the rotating handle 123. 124 is a hook that grips the bottom of the drum, and 125 is its lever. 126 is an upper neil, 127 is a lower neil, and the top of the drum is clamped using a lock handle 128. [Diagram 3] The mixing device used in the present invention is shown in cross-sectional side view (a), plan view (b), and partially cutaway side view (c). The device is equipped with a cylindrical tank 410 and mixing blades 420 extending circumferentially from its central rotation axis 411, and the waste oil O and wood chips C are mixed by horizontal rotation of the mixing blades at a low speed. [Figure 4]In this side view showing the surroundings of the agitation device of the present invention, above the agitation tank 410, there are shown a waste oil injection chute 300 that receives waste oil O discharged from an inverted drum D and injects it into the agitation tank 410, and a wood chip injection hopper 200 that receives wood chips C formed by crushing waste wood, thinning materials, etc., at an inlet 210 that opens diagonally forward and sends them to the agitation tank 410 below. The figure also shows a configuration in which the agitation tank 420 is equipped with a low-speed agitation drive mechanism 500. [Diagram 5] This is a perspective view showing the manufacturing process of the present invention, in which (1) a drum D is lifted by an inverting machine, (2) then transported to the top of a mixing tank, (3) the drum D is inverted there, and waste oil O is poured into the mixing tank 410, while (1)' waste wood chips C are poured into (2)' hopper 200 by a bucket 220, and then into the mixing tank 410 via the (3)' hopper. Then, in (4) the mixing tank 420, the waste oil O and the waste wood chips C are mixed and kneaded to produce a composite fuel M, which is then received and transported by (5) a conveyor 600. [Figure 6] Photographs (a) and (b) of actual size of two types of wood chips used in the present invention, (a) shows the case where the wood chips are relatively small, and (b) shows the case where the wood chips are relatively large. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention will now be described in detail with reference to the drawings. An overview is shown in Figure 1. The present invention comprises a process of transporting waste oil O in a drum D, a process of supplying wood chips C formed by crushing waste wood, a process of kneading the waste oil O and the wood chips C, and a process of transporting a composite fuel M formed by kneading the waste oil O and the wood chips C, in which (A) the drum D is lifted by an inverting machine 120 (1), transported to a mixing position (2), the drum is inverted (3), the waste oil O is fed into a mixer 400 via a waste oil feed chute 300, while the wood chips C formed by crushing waste wood are fed into a hopper 200, The process includes a step of (A) introducing chips C, which have been sieved through a rack 211 (see FIG. 4) while being vibrated by an air knocker 230, into the mixing device 400 by appropriately opening the input valve 240 via the inclined surface 212; (B) a step (4) of mixing the waste oil O and wood chips C at a low speed in the mixing tank 410; and (C) a step (5) of discharging the mixed fuel M of the waste oil O and wood chips C via an air cylinder-driven butterfly valve 430 provided at the bottom of the mixing tank 410 and loading the mixed fuel M onto a belt conveyor 600 for transport.

[0017] Waste oil O is mixed with wood chips C (Fig. 6(a)(b)) made from waste wood, thinned wood, etc., in a volume ratio of several times the amount of wood chips to the waste oil, or 2 to 5 times the volume, to produce a composite fuel M made of waste oil-impregnated chips with a light specific gravity of about 0.8 to 1.0. The wood chips may be mixed with oil-absorbing dried plant powders such as thinned wood, waste paper, and dead grass.

[0018] 3(a) and (b), a cylindrical tank 410 is provided with an agitation tank kneading means 400, which is provided with a pair of horizontally rotating agitation blade members 421, 422 extending from a central rotation shaft 411 in the tank radial direction and a U-shaped agitation blade 420 formed of a pair of horizontally rotating agitation blade members 421, 422 extending from the central rotation shaft 411 in the tank radial direction and a circumferential sliding agitation blade 423 extending in the vertical direction connecting the ends of the agitation blade 420. More specifically, the agitation tank 410 further includes an agitation blade 420 that rotates horizontally around the rotation shaft 410 that rotates at a low speed in the center of the agitation tank 400 to form a composite fuel M made of waste oil-impregnated chips with a specific gravity of about 0.8 to 1.0 by mixing several times the amount of wood chips C, for example, 2 to 5 times the volume of the waste oil O. This horizontally rotating agitator blade has a pair of upper and lower horizontally rotating two blades 421, 422 extending from a central rotation shaft 411 in the radial direction of the tank, which are arranged at intervals in the circumferential direction, rotate on a horizontal plane, and are equipped with a vertical blade 423 that slides on the inner circumference of the tank connecting the ends of each of the two blade members, forming a U-shaped agitator blade 420 through which the agitating flow flows between the two blades. This pair of upper and lower horizontally rotating twin blades 421, 422 have an inclined surface on the front side in the rotation direction that is inclined at 30 to 60 degrees from the horizontal plane, and are arranged at intervals above and below on the rotating shaft 411 and rotate horizontally, while the upper horizontally rotating stirring member 421 is arranged 30 to 60 degrees behind the lower horizontally rotating stirring member 422 in the rotation direction by the above-mentioned inclined surface angle, and is equipped with a vertical stirring blade 423 whose both ends are connected to the ends of the upper and lower stirring members and which slides on the circumferential side of the stirring tank, so that an ideal stirring motion can be obtained in the cylindrical stirring tank 410 by the specially shaped stirring blades to knead the waste wood chips C at a volume ratio several times that of the waste oil. That is, as shown in Fig. 3(c), the mixing blade 420 has two inclined surfaces 422a, 423a that slide on the bottom surface and the circumferential surface of the mixing vessel, and performs a bidirectional mixing action such that on the one hand, the action (A) of the inclined surface 422a digs up the solid wood chips from the bottom upward, and on the other hand, the action (B) of the inclined surface 423a gathers the solid wood chips inward from the circumferential surface, and further, the action (C) of the upper horizontal rotating blade member 421 mixes and levels the mound of the kneaded material formed in the vessel.

[0019] Above this mixing tank 410, a drum can D containing collected waste oil O is transported by an electric hoist 110 having an inverting machine 120 shown in Fig. 2. The electric hoist 110 transports the drum can D to the top of the mixing tank 410 by traveling on an erected ceiling rail R (Fig. 1(2)). At the collection site, the drum can D is grasped and lifted up by the inverting machine 120 (Fig. 1(1)). The drum can D is then transported to a predetermined position by the electric hoist 110 (Fig. 1(2)) and inverted (Fig. 1(3)).

[0020] The tipping machine 120 is shown in a side view in Fig. 2(a) and a front view in Fig. 2(b). The tipping machine 120 is provided with a pair of rotating shafts 122, 122 for gripping the body of a drum D at the tip of an inverted U-shaped hanging hook 121, and the body of the drum D is embraced by a curved member 122a. In action (1), the lower end of the drum D is engaged by a hook 124, while (2) the upper end of the drum D is engaged by an upper nipper 126 and a lower nipper 127 and fixed by a locking means 128. Then, when the rotating handle 123 is rotated (3), (4) the drum D starts to rotate around the rotating shaft 122, and (5) the suspended drum D discharges and pours waste oil O from the upper end opposite to the end gripped by the hook 124.

[0021] Above the mixing means 400, there is further provided a waste oil injection chute 300 equipped with an upper funnel-shaped portion 310, which receives waste oil O discharged from the inverted drum D and injects it into the mixing tank 410, and a wood chip injection hopper 200, which is located above the mixing means 400 and equipped with a receiving port 210 opening obliquely at the front, which receives a large amount of waste wood chips C formed by crushing waste wood, thinning wood, etc. from a bucket B, etc., receives it on a vibrating inclined surface 212 via a slat 211, and sends it to the lower mixing tank 410. On the other hand, below the mixing tank 410, there is provided a drive mechanism 500 which rotates the mixing blades 420 in the mixing tank 410 at a low speed. It is preferable that the rotation of the electric motor is reduced through a cyclo reducer 510 and transmitted to a rotating shaft 411 supported by bearings 530, 530 through a pair of spur gears 520.

[0022] After mixing the waste oil O and wood chips C, the composite fuel M consisting of wood chips impregnated with the waste oil is received from the bottom of the mixing tank 410, discharged onto the belt conveyor 600, and transported to the accumulation tank 700 for accumulation. It is preferable to provide a butterfly valve 430 at the bottom of the mixing tank 410. In the present invention, the wood chips C are produced from waste wood and thinned wood, but they may also be made by adding vegetable waste materials such as dead grass and waste paper. Figure 6 shows life-size photographs (a) and (b) of two types of wood chips, (a) showing a case where the wood chips are relatively small, and (b) showing a case where the wood chips are relatively large. They are used according to the amount of waste oil blended depending on the fuel application.

[0023] As described above, according to the present invention, as shown in Fig. 5, (1) the drum D is lifted by an inverting machine, (2) then transported to the top of the agitation tank, (3) the drum D is inverted there, and waste oil O is poured into the agitation tank 410, while (1)' wood chips C are poured into (2)' hopper 200 by a bucket 220, and (3)' into the agitation tank 410 via the hopper. Then, (4) in the agitation tank 420, the waste oil O and wood chips C are agitated and kneaded to produce a composite fuel M, which is (5) received and transported by a conveyor 600.

[0024] When waste oil O, which is collected in drums, is mixed with wood chips C, which are also waste materials, such as waste wood and thinning wood, a composite fuel M with a specific gravity of around 0.8 to 1.0 and excellent combustion properties can be produced. These composite fuels can not only be used directly as fuel, but can also be used as a combustion aid for burning waste materials that were previously difficult to imagine as fuel, such as used diapers and waste plastic products, and can be used as highly practical fuels. Moreover, this can also be used as a low-cost or zero-cost waste disposal technology, and is highly useful as it can simultaneously realize low-cost or zero-cost heat production and waste disposal.

Claims

1. A system facility for producing a composite fuel consisting of light-weight waste oil-impregnated wood chips by mixing waste oil O with wood chips C formed from waste wood or thinned wood, etc., in a volume ratio of several times the amount of wood chips to the waste oil, The plant is provided with a means for transporting waste oil O in a drum D, a means for supplying wood chips C formed by crushing waste wood or the like, a means for kneading the waste oil O and the wood chips C, and a means for conveying a composite fuel M obtained by kneading the waste oil O and the wood chips C, The means for transporting the waste oil O in the drum D includes a waste oil transport and supply means 100 consisting of an electric hoist 110 having an inverting machine 120 that runs on a ceiling rail R, and the drum D containing the collected waste oil O is suspended by the electric hoist 110, the drum D is transported to the top of the mixing tank 410, the suspended drum D is inverted by the inverting machine 120, and the waste oil O is discharged and poured from the drum D, The means for kneading the waste oil O and the wood chips C includes a waste oil injection chute 300 for receiving the waste oil O discharged from the inverted drum D and injecting it into the agitation tank 410, and a wood chip injection hopper 200 having an upper receiving port 210 for receiving the wood chips C from the bucket B or the like and sending them to the lower agitation tank 410. The apparatus comprises a cylindrical stirring tank 410, a kneading means 400 which rotates inside the stirring tank, and a drive mechanism 500 which decelerates an electric motor and rotates it at a low speed below the stirring tank 410. The kneading means 400 which rotates inside the stirring layer comprises a pair of horizontally rotating stirring blade members 421, 422 which extend from a central rotation shaft 411 in the radial direction of the tank and a vertical stirring blade member 423 which slides on a circumferential surface extending in the vertical direction connecting the ends of the vertically rotating stirring blade member 423, and is provided with a U-shaped stirring blade 420 having a stirring blade space through which the stirring flow of the waste oil O and wood chips C passes. The means for transporting the composite fuel M made by mixing the waste oil O and wood chips C includes a belt conveyor 600 that transports the composite fuel M made by mixing the waste oil O and wood chips C to an accumulation tank 700, and after mixing the waste oil O and wood chips C, the composite fuel M made by the waste oil-impregnated wood chips is received from the bottom of the mixing tank 410, transported to the accumulation tank 700, and accumulated in the waste oil-impregnated wood chips production system equipment.

2. 2. A composite fuel manufacturing system as set forth in claim 1, wherein said wood chips C are produced mainly from waste wood and thinned wood, and may also contain other materials such as dead grass and waste paper.

3. The stirring blade 420 which rotates horizontally around the rotating shaft 411 which rotates at a low speed in the center of the stirring vessel 410 is provided with a pair of upper and lower horizontally rotating stirring blade members 421, 422 which extend from the rotating shaft 411 in the radial direction of the vessel, each member being disposed vertically at an interval in the circumferential direction and rotating on a horizontal plane, and the ends of the pair of upper and lower stirring blade members are connected by a vertical stirring blade member 423 which slides on the inner circumference of the vessel, and the pair of upper and lower horizontally rotating stirring blade members 421, 422 have inclined surfaces which are inclined at 30 to 60 degrees in the rotating direction with respect to the horizontal plane, while the upper horizontally rotating stirring blade member 421 is inclined in the rotating direction with respect to the lower horizontally rotating stirring blade member 422. The inclined surface angle is 30 to 60 degrees and is arranged with an angle shifted backward in the direction of rotation, and a vertical stirring blade member 423 that connects both ends of a pair of upper and lower horizontally rotating stirring blades and slides on the circumferential side of the stirring tank is inclined at the same angle as the inclined surface angle, and the stirring blade 420 has two inclined surfaces that slide on the bottom and circumferential surface of the stirring tank, and generates a bidirectional stirring action, one of which digs up the wood chips C upward from the bottom, and the other of which gathers the wood chips C inward from the circumferential surface, and further, the mound of mixed material formed in the tank is leveled by the stirring blade member 421 that rotates horizontally upward.

4. In one batch mixing, several times the volume of wood chips C are added and mixed for the amount of waste oil, usually 200 liters, so that above the mixing tank 410, there are provided a waste oil injection chute 300 with a funnel-shaped section 310 at the top, which receives the waste oil O discharged from an inverted drum D and feeds it into the mixing tank 410, and a wood chip injection hopper 200 which receives wood chips C formed by crushing waste wood, thinning materials, etc. from a bucket B at an inlet 210 that opens diagonally forward, and sends the wood chips C to the mixing tank 410 below.The composite fuel production system equipment described in claim 1

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