JPH094834A - Method for burning wood chips - Google Patents

Abstract

PURPOSE: To dispose of, at a low cost, large-sized wood chips of a high water content produced when wood is cut by cutting instruments by simply, easily and efficiently burning the chips. CONSTITUTION: The method for burning wood chips includes the process of passing chips 2 of a wood 1 between neighboring rollers 7 in a pressed state. The rollers 7 crash and destroy the chips 2 of the wood 1 and forms them into shapes capable of being easily burnt. The rollers 7 squeeze water out of the chips 2 of large sizes onto the surface thereof. The chips 2 which have been destroyed and out of which water has been squeezed onto the surface thereof are transferred to an incinerator 4 and are efficiently burnt. The chips destroyed by the rollers are effectively heated to the inner part of the chips owing to cracks so that efficient combustion can be carried out. Combustion time for the chips which have been crashed by the rollers and out of which water has been squeezed onto the surface thereof can remarkably be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for incinerating wood chips cut with a blade for disposal.

[0002]

2. Description of the Related Art Raw wood is cut into a shape suitable for its purpose by cutting the surface with a knife. For example, in order to process the raw wood into a cylindrical shape, the outer circumference of the wood is scraped off with a rotating blade to form a cylindrical shape. The chips produced at this time are enormous and a considerable amount. This is because natural logs having various shapes are cut into a certain shape. The enormous amount of chips is expensive and time-consuming to dispose of. Easily disposing of chips is very important. This is because the expense of scrap disposal adds to the cost of the processed wood and adds to the cost of the product.

At present, chips produced by cutting wood with a blade are incinerated or disposed of as industrial waste. The method of dumping as waste is
It is difficult to secure a large disposal site. It is also necessary to transport a huge amount of chips to the disposal site. If the disposal site is far from the processing plant, the transportation cost will be extremely high. The method of incinerating the chips and discarding them is an ideal method because the chips can be processed in the generating plant.

[0004]

However, the chips of the blade cannot be easily incinerated. This is because it is not flammable powder like sawdust, but has large and various shapes. Large chips cannot be easily incinerated in an incinerator. Furthermore, the fact that the chips contain a large amount of water also makes combustion difficult. Chips obtained by cutting raw wood almost always contain a large amount of water. This is because raw wood that is not sufficiently dried is cut, or raw wood that has been immersed in water is cut. Large chips with high moisture content cannot be burned efficiently in an incinerator.
The incombustible chips consume a large amount of fuel and increase the disposal cost.

The present invention has been developed to solve this drawback. An important object of the present invention is to burn wood chips that can be easily and easily burned at high cost and can be discarded at a low cost by cutting large wood chips with a blade. To provide.

[0006]

In order to achieve the above-mentioned object, the method of burning wood chips of the present invention discards the chips 2 as follows. The method of the present invention is for wood 1
The chips 2 of 1 are passed in a pressed state between the rollers 7 approaching each other. The roller 7 crushes and destroys the chips 2 of the wood 1 to process it into a shape that is easy to burn. Further, the roller 7 squeezes out the water contained in the large chips 2 to the surface. The rollers 7 sandwich the chips 2 in a pressed state, and the chips 2 of the wood 1 that have been destroyed and whose water content has been squeezed out to the surface are sent to an incinerator 4 and efficiently incinerated.

[0007]

In the method of incinerating wood chips of the present invention, chips 2 obtained by cutting wood 1 with a blade 3 are pressed by rollers 7 and crushed to destroy them. The destroyed chips 2 have numerous cracks along the grain. Countless cracks, chips 2
Significantly increases the surface area of. Chips with a large surface area 2
Is efficiently burned in the incinerator 4. When burned,
This is because the chips 2 are heated from the surface, so that if the surface area is large, the chips 2 are efficiently heated. Furthermore, cracks
It is extended to the inside of the chip 2. The crack reaching the inside exposes the inside of the chip 2 to the surface. In the chips 2 in this state, the flame heat of the incinerator 4 penetrates inside through the cracks. Flame heat is not directly transmitted to the large chips 2 without cracks. In the chips 2, heat is transferred from the surface to the inside by conduction. For this reason, the inside of the chips 2 cannot be directly heated by flame heat and cannot be efficiently incinerated in a short time. The chips 2 that are directly heated to the inside due to the innumerable cracks can efficiently incinerate in a short time because the flame heat efficiently heats the entire chips 2.

Further, in the method of incinerating the chips of the present invention, the moisture contained therein is squeezed out to the surface to make it more flammable. The chips 2 sandwiched in the pressed state by the rollers 7 have numerous cracks, and the water contained therein is squeezed out to the surface. A part of the water squeezed on the surface is removed, but a part of the water adheres to the surface of the chips 2. The water transferred to the surface of the chips 2 is
When the chips 2 are put into the incinerator 4, they are directly heated by flame heat. Therefore, it vaporizes in an extremely short time and is removed from the chips 2. The chips 2 from which the water on the surface has been vaporized and removed have a small amount of water inside, and thus can be incinerated to the inside in a short time. Therefore, the chips 2 are efficiently heated in the incinerator 4, the water is efficiently removed, and the chips 2 are incinerated in a short time.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. However, the examples described below exemplify a method of incinerating chips for embodying the technical idea of the present invention, and do not specify the incineration method of the present invention to the following method.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims", "actions", and "actions". In the column of "Means for solving the problem". However, the members shown in the claims are
It is by no means specific to the members of the examples.

FIG. 1 shows an apparatus used in the method for incinerating wood chips of the present invention. The method of the present invention is a method of incinerating and discarding the chips 2 produced when the wood 1 is cut by the blade 3. The chips 2 incinerated by the method of the present invention are
Wood 1 is cut, not sawdust in powder form.
FIG. 1 shows a state in which chips 2 produced by cutting a surface of a raw wood 1 with a knife 3 to form a columnar shape are incinerated. However, the method of the present invention does not specify the chips to be incinerated as those generated when the raw wood is processed into a cylindrical shape.
As the chips, for example, a long waste material generated when cutting raw wood or wood into a prismatic shape and cutting it into chips can be used with a chipper machine.

The apparatus shown in FIG. 1 does not directly feed the wood chips 1 into the incinerator 4. The chips 2 pass through the roller press 5 and are supplied to the incinerator 4. The roller press 5 allows the chips 2 of the wood 1 to pass between the rollers 7 approaching each other in a pressed state. The two rollers 7 crush the chips 2 of the wood 1 with a strong pressure to break them. The destroyed chips 2 have numerous cracks along the grain. Further, the chips 2 crushed by the roller 7 have the water contained therein squeezed out to the surface. The squeezed water is partly separated from the chips 2, but the rest adheres to the surface of the chips 2 and is supplied to the incinerator 4 together with the chips 2. The chips 2 that have passed through the roller squeezing machine 5 are destroyed and innumerable cracks are formed, and water is squeezed on the surface and supplied to the incinerator 4.

2 to 5 show a roller press 5 for crushing chips. The roller squeezing machine 5 shown in these figures has four rollers 7, a cylinder 9 for pressing the rollers 7, a drive mechanism 11 for rotating the rollers 7, and
The roller 7 is provided with a casing 6 mounted via a bearing 8.

The rollers 7 are horizontally attached to the casing 6 so as to be vertically separated from each other in two stages. The roller press 5 having the two-stage rollers 7 crushes the chips 2 twice and discharges them. Therefore, it has a feature that the chips can be crushed more completely and the water can be efficiently squeezed to the surface. However, although not shown, it can be crushed by chips with a single-stage roller and supplied to the incinerator.

The surface of each of the four rollers 7 is knurled so that the chips 2 can be sandwiched and pushed out from above without slipping. The roller can also be provided with numerous flutes on the surface. The roller 7 has such strength that it does not deform even if the surface is crushed by chips. The roller 7 is, for example, a metal roller whose surface is hardened to make it hard.

The rollers 7 in each stage are arranged close to each other. This is because the chips 2 are passed between the rollers 7 and the chips 2 are crushed and destroyed. 2 to 4, the right roller is the fixed roller 7A,
The left roller is a pressure roller 7 that can move horizontally.
B.

The rotary shaft 13 of the fixed roller 7A is connected to a bearing fixed to the casing 6. The rotating shaft 13 of the pressing roller 7B is connected to a bearing 8 mounted on the casing 6 so as to be slidable in the horizontal direction. The bearing 8 of the pressing roller 7B is pressed by the cylinder 9 toward the fixed roller 7A. The cylinder 9 is a hydraulic cylinder. The cylinder 9 presses the pressing roller 7B against the fixed roller 7A with a pressing force of 9 tons, for example. However, the present invention does not specify the method of pressing the pressing roller against the fixed roller with the cylinder. Also, the pressure with which the pressing roller presses the fixed roller is not specified to be 9 tons. The pressure roller that is pressed by the cylinder has more chips 2
Can be completely destroyed, and the water content inside can be efficiently squeezed out to the surface. However, when the pressing force of the pressing roller is increased, the rotation torque of the roller is increased and an unreasonable load acts on the surface of the roller. Therefore, the pressing force of the pressing roller is adjusted to an optimum value in consideration of the driving horsepower and the durability of the roller, while the chips can be sufficiently crushed and destroyed to squeeze out water on the surface. The optimum pressing force of the pressing roller is not constant depending on the diameter of the roller, but for example, when the diameter of the roller is 30 cm,
It is adjusted to a range of 1 to 20 tons, preferably 3 to 15 tons, more preferably 5 to 12 tons.

A cylinder 9 for pressing the bearing 8 of the pressing roller 7B is horizontally fixed to the casing 6. In this cylinder 9, the tip of the rod 10 is connected to the bearing 8, and the pressing roller 7 is connected via the bearing 8.
B is pressed against the fixed roller 7A. Cylinder 9
Is a hydraulic cylinder, which is supplied with a constant hydraulic pressure to press the pressing roller 7B. Cylinder 9 is pressing roller 7
In the roller pressing machine 5 that presses B, when the large lump-shaped chips 2 are supplied between the rollers, the pressing roller 7B retracts and an unreasonable force does not act. Further, even if the pressing roller 7B retracts, the pressing roller 7B always presses the fixed roller 7A with a constant pressing force, so that the chips 2 can be crushed with a constant pressure.

Pressing roller 7 pressed by cylinder 9
B is the fixed roller 7 when the chips 2 are not supplied.
It is better not to contact A. This is because, if the pressing roller 7B and the fixed roller 7A are pressed while the roller 7 is not rotated, the pressing portion does not move and this portion is easily deformed. In order to realize this, the bearing 8 has a structure that does not move from a fixed position toward the fixed roller 7A. Although not shown, this structure can be realized by preventing the bearing from moving by hitting the end of the sliding groove, or by disposing a set screw on the right side of the bearing. The set screw is disposed on the right side of the bearing in parallel with the surface of the casing and in a horizontal direction, contacts the right end surface of the bearing, and stops the rightward movement of the bearing. The set screw is horizontally screwed into a nut fixed to the casing and attached to the casing. When the set screw is rotated, the tip of the set screw protrudes in the direction of the pressing roller to widen the distance between the pressing roller and the fixed roller. The amount of protrusion is adjusted by pressing both bearings at both ends of the pressing roller with a set screw. When the set screw adjusts the distance between the rollers, the set screw can freely adjust the distance between the rollers. The gap between the rollers is set to, for example, 0.1 to 0.5 mm.

The pressing roller does not necessarily have to be moved toward the fixed roller. Both the pressure roller and the fixed roller can be fixed in place on the casing. In the roller squeezing machine having this structure, the gap between the rollers needs to be slightly wide. This is because an unreasonable load is not applied to the roller and the bearing when large chips are supplied. The roller press having this structure allows chips to pass between the rollers having a constant gap, so that the chips can be crushed to a constant thickness. Also, the structure is simplified.

The drive mechanism 11 rotates the intermediate rotary shaft 14A by the reduction motor 12 and rotates the four rollers 7 by the intermediate rotary shaft 14A. The intermediate rotation shaft 14A is mounted on the casing 6 in parallel with the roller 7. Intermediate rotating shaft 14
A has sprockets 15 fixed on both sides and in the middle. The sprockets 15 on both sides are connected to the sprockets 15 fixed to the rotary shaft 13 of the roller 7 via a chain 16. The intermediate sprocket 15 is a reduction motor 12
Is connected to the sprocket 15 through a chain 16. In FIG. 4, the lower intermediate rotation shaft 14B adjusts the tension of the chain 16. Therefore, the bearing 17 of the lower intermediate rotary shaft 14B is attached to the casing 6 so as to be movable in the vertical direction.

The reduction motor 12, the chain 16, and
Through the sprocket 15, the four rollers 7 are rotationally driven at both ends. The fixed roller 7A and the pressing roller 7B, which are arranged close to each other, are rotated in the opposite directions so that the gaps approaching each other are moved downward.

The casing 6 has a hopper 18 above the upper roller 7. Above the hopper 18
A cyclone 19 is arranged as shown in FIG. The cyclone 19 is connected to a fan type carrier 20 that uses air as a carrier medium. The carrier 20 transfers the chips 2 of the wood 1 to the cyclone 19 with a high-speed air flow. Cyclone 1
9 separates the air and the chips 2 and supplies the chips 2 to the hopper 18. Chips 2 supplied to the hopper 18
Passes through between the two rollers 7 and is crushed and discharged.

Chips 2 discharged from the roller press 5
Is supplied to the incinerator 4 by a carrier 20 having the same structure as that connected to the hopper 18. This carrier 20
The chips 2 discharged from the roller press 5 are transferred to the cyclone 19 of the incinerator 4. Incinerator 4 is cyclone 1
The chips 2 separated in 9 are incinerated.

As shown in FIG. 1, the method of transporting air from the roller press 5 to the incinerator 4 with high-speed air is a transporting step and a cyclone 19 forcing a portion of the moisture adhering to the surface of the chips 2 into force. It has the feature that it can be vaporized and removed while being transferred. Air flows at high speed on the surface of the chips 2 that are conveyed by air. The air and the chips 2 move relative to each other at a considerable speed. More advantageously, the air carrying the chips 2 is adiabatically compressed by the fan and thus rises in temperature. The chips 2 are transferred from the roller press 5 to the cyclone 19 of the incinerator 4 in a state where the heated air flows on the surface at high speed. The air whose temperature has risen lowers the relative humidity and heats the moisture adhering to the surface of the chips 2 to create an environment in which it is easy to dry. Further, the air flowing at high speed efficiently dries the water content on the surface of the chips 2. For this reason,
While being conveyed from the roller press 5 to the incinerator 4, a part of the moisture in the chips 2 is efficiently removed, and the chips 2 with reduced moisture are supplied to the incinerator 4. Therefore,
The incinerator 4 can incinerate the chips 2 efficiently.

[0026]

The method of the present invention is characterized in that large and high-moisture-content chips produced by cutting wood with a blade can be incinerated easily and efficiently and discarded at low cost. This is because the method of the present invention crushes the chips with a roller to break them so that they are easily burned, and further squeezes the water content inside to the surface. The chips destroyed by the rollers are innumerable cracked and the surface area is significantly increased. Further, the crack exposes the inside of the chip to the surface. Further, the flame of the incinerator effectively heats the chips over a large area to the inside and efficiently burns them. Further, since the water content inside is squeezed out to the surface, it is possible to incinerate even the inside of the chips, which have long burning time, in a short time. In particular, the water squeezed on the surface can be vaporized and removed in a short time when supplied to the incinerator, so that the incineration time of the chips can be remarkably shortened.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a method for burning wood chips according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the roller position of the roller squeezing machine according to the embodiment of the present invention.

FIG. 3 is a plan view of a roller pressing machine according to an embodiment of the present invention.

FIG. 4 is a front view of a roller pressing machine according to an embodiment of the present invention.

FIG. 5 is a transverse sectional view of a roller squeezing machine according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Wood 2 ... Chips 3 ... Blade 4 ... Incinerator 5 ... Roller squeezing machine 6 ... Casing 7 ... Roller 7A ... Fixed roller 7
B ... Pressing roller 8 ... Bearing 9 ... Cylinder 10 ... Rod 11 ... Drive mechanism 12 ... Deceleration motor 13 ... Rotating shaft 14A ... Intermediate rotating shaft 14B ... Intermediate rotating shaft 15 ... Sprocket 16 ... Chain 17 ... Bearing 18 ... Hopper 19 ... Cyclone 20 ... Carrier

Claims (1)

[Claims] 1. A method for incinerating chips produced by cutting wood with a blade in an incinerator, wherein chips (2) of wood (1) are passed into a pressed state between rollers (7) approaching each other. Then, the chips (2) of the wood (1) are crushed and destroyed by the roller (7), and the moisture contained inside is squeezed to the surface, and the moisture is squeezed out to the surface of the wood (1). A method for burning wood chips, which comprises supplying the chips (2) to an incinerator (4) for incineration.