JP2014196888A - Wooden chip supply method and wooden chip supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wooden chip supply method capable of stably and inexpensively supply an existing coal treatment facility with wooden biomass.SOLUTION: A wooden chip supply method supplies a supply destination with wooden chips C by allowing the same to fall through a feeding port provided with a grid 40. In the method, compressed air is injected toward the wooden chips C falling onto the grid 40 with: an injection speed of 4 m/s or more; an injection width not less than a supply width at a point where the wooden chips C start to fall; and an injection angular range from a depression angle of 30° and an elevation angle of 30° with respect to a horizontal plane.

Description

  The present invention relates to a wood chip supply method and a wood chip supply apparatus for supplying chips obtained by pulverizing wood biomass to a supply destination facility.

  Biomass is an organic resource derived from renewable organisms. Biomass made of wood is called woody biomass. Woody biomass mainly includes forest land remnants such as branches and leaves generated in logging and sawing of trees, bark and sawdust generated from lumber mills, demolition materials for houses and pruned branches of street trees, etc. Of these, unused thinned wood such as forest land residue is rarely used, and its treatment is an important issue. For example, woody biomass can be used as energy instead of fossil fuel because it is renewable energy. By using it as an alternative to fossil fuels, it is possible to reduce carbon dioxide emissions and contribute to the prevention of global warming.

JP 2005-138491 A

  In existing coal processing facilities such as coal-fired power generation and blast furnace PCI, woody biomass is mixed with coal as fuel. Generally, woody biomass used for fuel is processed into wood chips or wood pellets. There are processing methods such as cutting and crushing as processing methods of the wood chip, but since the cutting processing is costly, it is usually crushed. When wood biomass is crushed, it becomes a rod-like long and thin wood chip. A wood chip has the property of being easily entangled by wood fibers appearing on the surface.

  On the other hand, in a coal conveyance line of an existing coal processing facility into which woody biomass is introduced, a lattice is installed at the coal inlet in order to prevent foreign matters from entering and coal from falling when the coal is introduced. Wood chips crushed from wood biomass are usually transported by a conveyor and continuously fed into the coal inlet. However, wood chips can be entangled and suspended on a grid to stably supply wood chips to the coal transport line. Can not. In order to provide a stable supply of wood chips, it may be possible to install a separate facility for supplying the wood chips to the coal transport line while avoiding the lattice. However, capital investment is required and the removal of foreign substances mixed in the wood chips is also possible. It becomes difficult. Furthermore, if the wood chips are supplied without passing through the lattice, the wood chips entangled at the time of loading may cause clogging in a later process.

  Alternatively, it is conceivable that the wood chips are further finely crushed to a size that can surely pass through the lattice even if the wood chips are somewhat entangled. However, it is expensive to finely crush the wood chips. Further, when the wood chip is finely crushed, a part of the wood becomes powdery and adheres to the wood chip during crushing. When such a wood chip is conveyed, fine powder adhering to the wood chip may fly and adversely affect surrounding equipment. For this reason, it is necessary to remove fine powder from the wood chip by using a wood chip processing apparatus as described in Patent Document 1, for example, which further increases costs.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is a new and improved method capable of stably and inexpensively supplying woody biomass to an existing coal processing facility. Another object of the present invention is to provide a wooden chip supplying method and a wooden chip supplying apparatus.

  In order to solve the above-described problems, according to one aspect of the present invention, there is provided a wood chip supply method for dropping a wood chip and allowing it to pass through a slot provided with a lattice without being suspended from a shelf and supplying it to a supply destination. Is done. Such a wood chip supplying method is such that a compressed air is blown at a spraying speed of 4 m / s or more and a spray width is not less than a supply width at a dropping start point of the wood chip and is downward with respect to a horizontal plane. Injecting at a spray angle between 30 ° and 30 ° upward.

  A grid is provided at the entrance of the wood chip for removing foreign substances and preventing a person from falling. When wood chips are inserted toward the lattice, even if each of the wood chips is sized to pass through the lattice, due to the nature of the wood chips being entangled, if the wood chips are suspended on the lattice, the suspended parts The shelf hanging grows as a starting point, and the wood chips are not supplied to the supply destination. Therefore, in the present invention, in order to prevent the wooden chips from being suspended from the shelf, compressed air is applied to the wooden chips that have been dropped and dropped onto the lattice, and the spraying speed is 4 m / s or more, and the spray width starts to drop the wooden chips. Injecting at a spray angle between 30 ° downward and 30 ° upward with respect to a horizontal plane perpendicular to the falling direction of the wood chip, at a supply width equal to or greater than the supply width at the point. Thereby, the wooden chip in the fall state diffuses and falls on the lattice. Thus, each wooden chip can be supplied to the supply destination through the grid before being suspended from the grid.

  Here, it is preferable that the blowing speed of the compressed air be 10 m / s or less. If the spraying speed of the compressed air is too high, the wood chips will be scattered outside the range of the inlet. Therefore, by setting the spraying speed of the compressed air to 10 m / s or less, it is possible to eliminate the wood chips that are scattered and lost outside the range of the inlet.

  The wooden chip may be transported from a direction intersecting with the falling direction of the wooden chip to the start point of dropping. At this time, the compressed air may be jetted in the transport direction of the wood chip transported to the fall start point. By injecting the compressed air in the same direction as the conveying direction of the wooden chips, the wooden chips can be diffused more efficiently than injecting the compressed air from other directions.

  The compressed air may be jetted from a position close to the fall start point in the height direction from below the fall start point of the wood chip. By blowing compressed air on the wood chip at a height as close as possible to the fall start point, the wood chip can be efficiently diffused.

  In order to solve the above-mentioned problem, according to another aspect of the present invention, the wooden chip is transported to the dropping start point, and the wooden chip is dropped from the dropping start point and put into the inlet provided with the lattice. The air pressure is 4 m / s or more and the spray width is greater than the supply width at the drop start point of the wood chip, and is perpendicular to the fall direction of the wood chip with respect to the transport position and the wood chip drop position on the lattice. There is provided a wood chip supply device comprising: a compressed air nozzle that sprays at a spray angle between 30 ° downward and 30 ° upward with respect to a plane.

  As described above, according to the present invention, it is possible to provide a wood chip supply method and a wood chip supply device that can stably and inexpensively supply wood biomass to existing coal processing facilities.

It is explanatory drawing which shows schematic structure of a coal processing equipment provided with the wood chip supply apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the spraying speed, the spraying angle, and the spraying width of the compressed air nozzle of a wood chip supply apparatus. It is a graph which shows the relationship between the spraying speed of a compressed air nozzle, and the shelf hanging amount of a wood chip. It is a graph which shows the relationship between the spraying speed of a compressed air nozzle, and the amount of scattering of a wood chip. It is a graph which shows the relationship between a compressed air supply width ratio and the shelf hanging amount of a wood chip. It is a graph which shows the relationship between a spraying angle and the shelf hanging amount of a wood chip. It is a graph which shows the relationship between a spray angle and the amount of scattering of a wood chip.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. Configuration of coal processing equipment>
First, with reference to FIG. 1, schematic structure of a coal processing equipment provided with the wood chip supply apparatus which concerns on embodiment of this invention is demonstrated. In addition, FIG. 1 is explanatory drawing which shows schematic structure of the coal processing equipment 1 provided with the wood chip supply apparatus 20 which concerns on this embodiment. In the present embodiment, an equipment for pulverizing coal is taken up as the coal processing equipment 1. In the facility 1, the wood chip supply device 20 is arranged so that the wood chips C are input from a coal input port 30 for supplying coal to a coal transport line 50 for transporting coal to a coal pulverizer (not shown). . The wood chip C put into the coal conveyance line 50 is conveyed to the coal pulverizer together with the coal.

  More specifically, as shown in FIG. 1, the coal transport line 50 is supplied from a coal inlet 30 and passes coal and wood chips C that have passed through a lattice 40 provided in the coal inlet 30 to a coal pulverizer. Transport. Coal is loaded from the coal inlet 30 by a dump truck or the like that has loaded and transported coal, and the wood chip C is accommodated in the hopper 10 and is transported by the wood chip supply device 20 when supplied from the hopper 10. Then, it is introduced from the coal inlet 30.

  The wood chip supply device 20 is provided for a transport unit 22 that transports the wood chip C supplied from the hopper 10 to the coal input port 30 and a wood chip C that is input from the transport unit 22 and falls toward the coal input port 30. And a compressed air nozzle 28 for blowing compressed air.

  The conveyance unit 22 includes two conveyance rollers 24a and 24b, an endless belt 26 stretched around the conveyance rollers 24a and 24b, and a drive unit (not shown) that rotates the conveyance rollers 24a and 24b. The conveyance unit 22 rotates the endless belt 26 by rotating the conveyance rollers 24 a and 24 b in a predetermined direction by the driving unit, and the wood chip C dropped on the endless belt 26 from the hopper 10 to the coal supply port 30. The endless belt 26 that serves as a starting point for dropping the wood chip C is fed into the coal inlet 30 from the upstream end in the conveying direction (hereinafter also referred to as “belt head”). The transport unit 22 is supported and installed by a base 29. The transport unit 22 is installed such that the belt head is positioned above the lattice 40 so that the wood chip C introduced from the transport unit 22 surely falls on the lattice 40.

  The compressed air nozzle 28 blows compressed air against the falling wood chip C introduced into the coal inlet 30 from the transport unit 22. Since the wooden chips C are easily entangled with each other, simply dropping the wooden chips C from the transport unit 22 immediately stacks the wooden chips C on the lattice 40 and suspends them. The pneumatic nozzle 28 is provided in order to prevent the wooden chips C from hanging on the shelves and to stably feed the wooden chips C into the coal conveyance line 50. The compressed air nozzle 28 can be provided, for example, on a base 29 that supports the transport unit 22. When the compressed air is blown, the wood chip C is diffused and reaches the lattice 40. That is, the wood chip C can easily pass between the lattices 40 by compressed air. Since the entanglement between the wood chips C is removed, it is possible to prevent the wood chips C from being suspended on the lattice 40.

  The compressed air nozzle 28 ejects compressed air from a position lower than the belt head of the endless belt 26 of the transport unit 22 along a plane (zx plane) perpendicular to the width direction (y direction) of the endless belt 26. That is, when the wood chip transport device 20 is viewed from above, the compressed air is jetted in the same direction as the transport direction (x direction) of the wood chips C by the transport unit 22. Rather than spraying compressed air on the wood chip C before dropping, spraying the compressed air on the wood chip C in a falling state can be surely dispersed and dropped onto the lattice 40. Therefore, by blowing the compressed air from below the belt head, the compressed air can be reliably blown to the wood chip C in the fall state. At this time, the wood chip C can be further diffused by applying compressed air to the wood chip C dropped from the transport unit 22 at a position close to the belt head. Therefore, the compressed air nozzle 28 is preferably provided at a position as close to the belt head as possible in the height direction (z direction).

  Further, the compressed air nozzle 28 may be provided so as to inject compressed air in the same direction (x-axis positive direction) as the direction in which the wood chip C is conveyed, and the direction opposite to the direction in which the wood chip C is conveyed (x You may provide so that a pressurized air may be injected in an axial negative direction. For example, when compressed air is ejected from other directions such as the width direction (y direction) of the endless belt 26 orthogonal to the conveying direction (x direction), the wooden chip is more than when compressed air is ejected along the conveying direction of the wooden chip C. The diffusion effect of C is small. Therefore, the wood chip C can be effectively diffused by providing the compressed air nozzle 28 so as to eject the compressed air in the same direction as the conveying direction of the wood chip C.

  For this reason, for example, the compressed air nozzle 28 is preferably provided near the belt head on the front surface of the base 29 that supports the transport unit 22 (the surface on the upstream side of the transport unit 22 in the transport direction). For example, when the height of the belt head from the upper surface of the lattice 40 is 1.5 m, the wood chip C can be effectively diffused by providing the compressed air nozzle 28 at a position of 0.5 m from the belt head. Further, the diffusion of the wood chip C changes according to the spray speed, spray width, and spray angle of the compressed air injected by the compressed air nozzle 28. The setting of the blowing speed, the blowing width, and the blowing angle of the compressed air by the compressed air nozzle 28 will be described later.

  The wood chip C input from the wood chip supply device 20 passes through the lattice 40 provided in the coal input port 30 and is supplied to the coal conveyance line 50. The lattice 40 is provided to remove foreign matters mixed in the coal processed by the coal processing facility 1 and to prevent a person from falling. The coal supplied to the coal conveyance line 50 is usually a smooth one having an average particle diameter of 50 mm and a moisture content of about 9 to 11 wt%. The lattice 40 is usually formed to have an opening of about 100 × 150 mm so that such coal can pass through and foreign matter can be removed. This is because if the opening is too large, there is a high possibility that foreign matter will pass through the lattice 40, and if the opening is too small, there is a high possibility that even the coal cannot pass through the lattice 40.

  When wood chips C are inserted into such a lattice 40, even if each of the wood chips C is of a size that can pass through the lattice 40, the wood chips C are placed on the lattice 40 even if they are a little shelf due to the nature of the wood chips C being tangled. When suspended, the shelf suspension grows starting from the suspended portion. In the wood chip supply device 20 according to the present embodiment, the wood chips C are diffused by the compressed air nozzle 28 so that the wood chips C are not suspended from the lattice 40.

<2. Setting of compressed air when supplying wood chips>
In order to drop the wood chip C to the coal conveyance line 50 without hanging the shelf from the lattice 40 provided at the coal input port 30 when the wood chip C is input from the coal input port 30, the wood chip according to the present embodiment is used. The supply device 20 includes a compressed air nozzle 28 that diffuses the wood chip C. By appropriately setting the blowing speed, the blowing width, and the blowing angle of the compressed air by the compressed air nozzle 28, the wood chip C falling from the transport unit 22 can be reliably diffused and allowed to pass through the lattice 40. Hereinafter, the setting of the blowing speed, the blowing width, and the blowing angle of the compressed air by the compressed air nozzle 28 will be described based on FIGS.

  In the following, the drop position of the wood chip C is a position on the xy plane parallel to the lattice 40 orthogonal to the drop direction of the wood chip, and the width (y direction) of the endless belt 26 of the transport unit 22 on the lattice 40. The intersection of the midpoint position y0 of w1 and the position (x0) of the belt head in the conveying direction (x direction) of the wood chip C. Moreover, in the test of FIGS. 3-7, the softwood crushing chip | tip which is a 100-mm hole passing goods and whose moisture amount is 45-61 wt% is used as the wood chip | tip C. FIG. The width w1 of the endless belt 26 of the conveying unit 22 of the wood chip supply device 20 of the coal processing facility 1 is 350 mm, and the height of the belt head from the upper surface of the lattice 40 is 1.5 m. The size of the grid 40 is 2 × 2 m and is provided so as to cover the coal inlet 30. The size of each opening of the lattice 40 is 100 × 150 mm.

(Pressurized spray speed)
First, the pressure blowing speed v by the pressure nozzle 28 will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing the spray speed, spray angle, and spray width of the compressed air nozzle 28 of the wood chip supply device 20. FIG. 3 is a graph showing the relationship between the spraying speed v of the compressed air nozzle 28 and the amount of the wooden chip C that is suspended from the shelf. FIG. 4 is a graph showing the relationship between the spray velocity v of the compressed air nozzle 28 and the amount of scattering of the wood chip C. 3 and 4, when 100 kg of wood chip C is supplied at 2000 kg / Hr, the compressed air supply width ratio (the compressed air blowing width w 2 / the width w 1 of the endless belt 26) is 1, and the compressed air is sprayed by the compressed air nozzle 28. The result of changing the spray velocity v with the angle θ set to 0 ° is shown. The blowing speed v of the compressed air can be measured using an anemometer such as an anemometer.

  The blowing speed v of the compressed air nozzle 28 is preferably set to 4 m / s or more and 10 m / s or less at the dropping position of the wood chip C introduced from the wood chip supply device 20 above the lattice 40. As described above, when the wooden chip C is suspended on the lattice 40 even if even a little, the suspended shelf grows from the suspended portion. Therefore, it is desirable that the amount of wooden chips C stacked on the lattice 40 without passing through the lattice 40 (shelf hanging amount) is zero. On the other hand, if the blowing speed v of the compressed air is increased so as not to suspend the shelves, the wood chips C are diffused, but if they blow too much, the wood chips C are scattered outside the lattice 40 and are not supplied to the coal transport line 50. It is desirable that the amount (scattering amount) of the wood chip C that is lost when the wood chip C supplied from the wood chip supply device 20 is scattered outside the installation range of the lattice 40 is also zero. Therefore, the compressed air blowing speed v is set so that both the amount of suspended wood and the amount of scattering of the wood chip C are zero.

  First, as for the shelf hanging amount of the wood chip C, as shown in FIG. 3, the shelf suspension of the wood chip C does not occur when the spraying speed v is 4 m / s or more, but when the spraying speed v is less than 4 m / s, the spraying speed v is decreased. The shelf hanging amount of the wood chip C increases rapidly as it becomes smaller. If the spraying speed v is less than 4 m / s, the wood chip C is not sufficiently diffused, so it is considered that the wood chip C is suspended on the lattice 40. Accordingly, it is desirable that the spraying speed v of the compressed air nozzle 28 is 4 m / s or more.

  On the other hand, if the spray velocity v of the compressed air nozzle 28 is increased too much, the wood chip C will blow out of the coal inlet 30 where the lattice 40 is installed, and the wood chip C cannot be reliably supplied to the coal conveyance line 50. . Therefore, the amount of the wood chip C scattered outside the installation range of the grid 40 was measured by using the amount of the wood chip C supplied from the wood chip supply device 20 as a scattering amount. As a result, as shown in FIG. 4, the scattering amount is zero when the spraying speed v is 10 m / s or less, but when it exceeds 10 m / s, the wood chip C that starts to fly out of the installation range of the lattice 40 starts to be generated. I understood it. Accordingly, it is desirable that the spraying speed v of the compressed air nozzle 28 is 10 m / s or less.

(Pressurized spray width)
Next, the blowing width of the compressed air by the compressed air nozzle 28 will be described based on FIG. 2 and FIG. The compressed air blowing width w2 refers to the spread in the width direction (y direction) of the portion where the compressed air jetted from the compressed air nozzle 28 at the falling position of the wood chip C is equal to or higher than a predetermined speed. The predetermined speed is set to, for example, a lower limit value of the compressed air blowing speed v, and can be set to 4 m / s, for example. If the compressed air blowing width w2 is narrow, it is considered that the compressed air hits only a part of the wood chip C supplied from the transport unit 22 and the wood chip C cannot be sufficiently diffused. In the wood chip supply device 20 according to the present embodiment, the compressed air blowing width w2 is set to be equal to or greater than the supply width at the drop start point of the wood chip C, that is, the width w1 of the endless belt 26.

  The spraying angle θ of the compressed air by the compressed air nozzle 28 was set to 0 °, and the spray width w2 of the compressed air nozzle 28 was changed, and the amount of shelf hanging on the lattice 40 generated when 100 kg of the wood chip C was supplied at 2000 kg / Hr was measured. . FIG. 5 is a graph showing the relationship between the compressed air supply width ratio and the amount of the wooden chip C that is suspended from the shelf. Here, the compressed air supply width ratio is represented by the ratio (w2 / w1) of the compressed air blowing width w2 to the width w1 of the endless belt 26. As shown in FIG. 5, when the compressed air supply width ratio is 1 or more, that is, when the compressed air blowing width w2 is equal to or greater than the width w1 of the endless belt 26, the wooden chip C is not suspended, but the compressed air supply width ratio It has been found that when the compressed air supply width ratio becomes smaller when the air pressure is smaller than 1, the shelf hanging of the wood chip C increases. Accordingly, it is desirable that the blowing width w2 of the compressed air nozzle 28 be equal to or larger than the width w1 of the endless belt 26.

(Pressure angle of compressed air)
Next, the compressed air blowing angle θ by the compressed air nozzle 28 will be described with reference to FIGS. The spray angle θ represents the inclination of the compressed air nozzle 28 with respect to the xy plane with the xy plane as a reference (0 °). The upward angle with respect to the reference xy plane is a positive value, and the downward angle is a negative value. Represent. In the wood chip supply device 20 according to the present embodiment, it is desirable that the spray angle θ of the compressed air nozzle 28 is set to −30 ° ≦ θ ≦ 30 °.

  When the blowing angle θ of the compressed air nozzle 28 is smaller than 0 °, the compressed air is jetted downward, so that the wood chip C dropped from the transport unit 22 falls so as to be sprayed onto the lattice 40. If the spray angle θ is too small, the wood chip C tends to be hung on the lattice 40. Therefore, the pressure air supply width ratio was set to 1, and the air blowing angle θ was changed to measure the amount of shelf hanging on the grid 40 generated when 100 kg of wood chips C were supplied at 2000 kg / Hr. In FIG. 6, the graph which shows the relationship between spray angle (theta) and the amount of shelf suspension of the wood chip C is shown. As shown in FIG. 6, when the spraying angle θ is −30 ° or more, the wooden chip C is not suspended from the shelf, but when the spraying angle θ is smaller than −30 °, the wooden chip C decreases as the spraying angle θ decreases. It was found that the amount of shelf hanging increased. Accordingly, it is desirable that the spray angle θ be −30 ° or more.

  On the other hand, when the blowing angle θ of the compressed air nozzle 28 is larger than 0 °, the compressed air is jetted upward, so that the wood chip C dropped from the transport unit 22 is blown up and diffused by the compressed air. However, if the spray angle θ is increased too much, the wood chips C are scattered outside the installation range of the lattice 40. Accordingly, the pressure air supply width ratio was set to 1, and the spray angle θ of the compressed air was changed, and the amount of scattering of the wood chips C scattered when 100 kg of wood chips C were supplied at 2000 kg / Hr was measured. In FIG. 7, the graph which shows the relationship between spray angle (theta) and the scattering amount of the wood chip | tip C is shown. As shown in FIG. 7, when the spray angle θ is 30 ° or less, the wood chip C does not scatter outside the installation range of the lattice 40, but when the spray angle θ is greater than 30 °, the wood chip C increases as the spray angle θ increases. It was found that the amount of scattered C increased. Accordingly, it is desirable that the spray angle θ be 30 ° or less.

  Thus, when the wood chip C is supplied as raw fuel by the wood chip supply device 20 onto the lattice 40 installed to remove foreign substances and prevent human fall, the wood chip supply device 20 uses the wood chip on the lattice 40. The pressure air is directed toward the falling position of C so that the spray speed v is 4 m / s or greater, the spray width w2 is greater than or equal to the width w1 of the endless belt 26, and the spray angle θ is between 30 ° downward and 30 ° upward. Spray. Thereby, the wooden chip C in the fall state can be diffused so that the wooden chip C introduced from the transport unit 22 does not hang on the shelf when it falls on the lattice 40. Since the wood chips C are diffused and pass through the openings of the lattice 40 without being suspended from the shelves, they are stably supplied to the coal conveyance line 50. Moreover, since the wooden chip C can be prevented from being suspended by spraying the compressed air with the compressed air nozzle 28 on the wooden chip C in a fall state, the inexpensive wooden chip C can also be used as a raw fuel. The shelf hanging prevention function of the wood chip supply device 20 can be realized with a simple configuration.

  Furthermore, the amount of the wood chips C scattered outside the lattice 40 can be reduced to zero by setting the pressured air blowing speed v to 10 m / s or less. Thereby, the wood chip C which becomes a loss without being supplied to the coal conveyance line 50 can also be eliminated.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above embodiment, the compressed air nozzle 28 is fixed to the base 29 of the transport unit 22, but the present invention is not limited to such an example. For example, the compressed air nozzle 28 may be fixed to another member.

DESCRIPTION OF SYMBOLS 1 Coal processing equipment 10 Hopper 20 Wood chip supply apparatus 22 Conveyance part 24a, 24b Conveyance roller 26 Endless belt 28 Pressure air nozzle 29 Base 30 Coal inlet 40 Lattice 50 Coal conveyance line C Wood chip

Claims (5)

A wood chip supply method for dropping a wood chip and passing it through a slot provided with a grid and supplying it to a supply destination,
With respect to the wooden chips falling on the lattice, the compressed air is blown at a spraying speed of 4 m / s or more, the spraying width is more than the supply width at the start point of the dropping of the wooden chips, and upwards from 30 ° downward with respect to the horizontal plane. A method for supplying wood chips, characterized by spraying at a spray angle between 30 °.   The wood chip supply method according to claim 1, wherein the compressed air spraying speed is 10 m / s or less. The wooden chip is transported from the direction intersecting the falling direction of the wooden chip to the fall start point,
3. The wood chip supply method according to claim 1, wherein the compressed air is jetted in the same direction as a transport direction of the wood chips transported to the fall start point. 4.   4. The wood according to claim 1, wherein the compressed air is jetted from a position close to the fall start point in a height direction from below the fall start point of the wood chip. 5. Chip supply method. Conveying the wood chip to the fall start point, a transport unit that drops the wood chip from the fall start point and puts it into an insertion port provided with a lattice;
With respect to the wooden chips falling on the lattice, the compressed air is blown at a spraying speed of 4 m / s or more, the spraying width is more than the supply width at the start point of the dropping of the wooden chips, and upwards from 30 ° downward with respect to the horizontal plane. A compressed air nozzle that sprays at a spray angle between 30 °;
A wood chip supply device comprising:

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