KR20230037741A - Manufacturing method of BIO-SRF using waste wood - Google Patents

Abstract

According to the present invention, disclosed is a method for manufacturing bio-solid fuel using waste wood, which can omit a drying process during a manufacturing process of bio-solid fuel through waste wood, and thus can reduce the construction costs of drying facilities and a manufacturing process and time. The present invention includes a waste wood preparing step, a wood chip forming step, a sawdust forming step, and a molding step.

Description

Manufacturing method of bio solid fuel using waste wood {Manufacturing method of BIO-SRF using waste wood}

The present invention relates to a method for producing bio solid fuel using waste wood, comprising: a waste wood preparation step of collecting and preparing waste wood; a step of forming wood chips by crushing and pulverizing the waste wood to a predetermined size to form wood chips, and selectively removing metals including iron using a magnet after crushing and pulverizing; a sawdust forming step of putting the wood chips into a crushing device to form sawdust; It relates to a bio-solid fuel manufacturing method using waste wood, characterized in that it comprises a; molding step of forming a solid fuel in the form of pellets by introducing the sawdust into a molding machine.

In general, solid fuel (SRF; Soild Refuse Fuel) is produced from combustible waste (excluding designated waste and infectious waste) into solid fuel that meets the quality standards set by the law through processes such as sorting, crushing, drying, and molding. This solid fuel product has the advantage of increasing the recycling rate of waste and increasing the efficiency of national resource management by expanding the scope of waste recycling.

The solid fuel products are currently unified solid fuel and product standards in the four classification methods of RPF (Refuse Plastic Fuel), RDF (Refuse Derived Fuel), TDF (Tire Derived Fuel), and WCF (Wood Chip Fuel). For this purpose, it is divided into two classification methods: general solid fuel products (SRF) and bio-solid fuel products (Bio-SRF).

At this time, the bio solid fuel product, which is distinguished from the general solid fuel product (SRF), is waste paper, agricultural waste, waste wood, vegetable residues, herbaceous waste, and other energy sources that are not designated wastes under Article 2, Subparagraph 4 of the [Waste Management Act]. It refers to solid fuel manufactured using combustible solid waste of biomass waste recognized and announced by the Minister of Environment that it can be used as a fuel. It is divided into molded products and non-formed products.

Such bio-solid fuel products have the advantage of being able to recycle waste biomass as an energy source.

In particular, in a state where there are many restrictions on the use and utilization of conventional fossil fuels due to various situations such as global economic recession, high oil prices, resource depletion, and global warming, bio Solid fuel products are regarded as new and renewable energy in Korea because they can minimize the generation of waste and maximize the recycling of available resources among waste.

On the other hand, in relation to the conventional bio-SRF, Korean Patent No. 10-1539224 "Method for Manufacturing Biomass Solid Fuel" and Domestic Patent No. 10-1579930 "Manufacturing Method of Wood Pellet for Biomass Power Generation Using Low-grade Waste Wood", etc. has been initiated.

In the conventionally disclosed method of manufacturing solid fuel using waste wood, including the prior art, a separate drying facility is required because the prepared waste wood must be crushed and then a drying process to remove moisture contained in the crushed waste wood must be performed. There was a problem in that the cost for construction was incurred and the overall manufacturing process and time were increased.

The present invention was invented to solve the above problems, and it is possible to omit the drying process during the manufacturing process while manufacturing solid fuel through waste wood, thereby reducing the construction cost of drying facilities, and manufacturing process The purpose is to provide a method of manufacturing biosolid fuel using waste wood that can reduce time and energy.

In order to solve the above problems, the present invention includes a waste wood preparation step of collecting and preparing waste wood; a step of forming wood chips by crushing and pulverizing the waste wood to a predetermined size to form wood chips, and selectively removing metals including iron using a magnet after crushing and pulverizing; a sawdust forming step of putting the wood chips into a crushing device to form sawdust; It characterized in that it comprises a; molding step of forming the solid fuel in the form of pellets by introducing the sawdust into the molding machine.

In addition, in the present invention, the wood chip forming step includes a crushing step of crushing the prepared waste wood to a size of 15 to 30 cm, and a first magnetic sorting step of selectively removing metals including iron from the shredded waste wood using a magnet and a crushing step of pulverizing the shredded waste wood from which the metals have been removed to a size of 1 to 15 cm to form wood chips, and a second magnetic sorting step of sorting and removing metals including iron from the wood chips using a magnet; A screen step of introducing the wood chips from which the metals are removed into a vibrating screen to filter out foreign substances contained in the pulverized waste wood and sorting out only the wood chips that have passed through the vibrating screen; It includes a tertiary magnetic sorting step of sorting and removing metals, and it is possible to gradually reduce the moisture contained in the waste wood through a crushing process, a crushing process, a screening process, and a repetitive magnetic sorting process. It is characterized in that a separate drying process can be omitted through.

In addition, in the present invention, the crushing device, the inside is empty, the input port is formed on the top and the hopper-shaped body in which the discharge port is formed on the bottom surface, a drive motor disposed between the input port and the discharge port in the inside of the body, the A crushing member including a rotary shaft inserted into the rotary shaft of the drive motor and a plurality of crushing blades coupled to the outer circumferential surface of the rotary shaft in a radial direction and crushing the injected wood chips, and between the outlet and the crushing member inside the main body It is characterized in that it includes a perforated network in which a plurality of perforated holes are arranged so that the sawdust crushed by the plurality of crushing blades can be discharged to the lower portion.

In addition, in the present invention, the molding machine is formed in the form of a ring with an open upper surface, a closed bottom surface, and a compression chamber inside, with a predetermined thickness, and a plurality of extrusion holes communicating with the compression chamber are arranged at regular intervals along the outer circumferential surface. A ring die formed, a first rotating shaft installed vertically in the center of the bottom surface of the compression chamber and rotated by a driving motor, a base frame coupled to the upper end of the first rotating shaft, and installed vertically on the upper surface of the base frame A pair of second rotational shafts disposed apart from each other at a predetermined distance, bearings installed in a form surrounding the outer circumferential surface of the second rotational shafts, and a pressure roller coupled to the bearings and provided in a state in which free rotation is possible It is characterized in that it includes a compression member and a cutting blade for cutting the compression molded product extruded through the extrusion hole into pellets of a predetermined size.

In addition, the present invention further includes a vacuum transfer step of vacuum-transferring the wood chips discharged through the outlet of the crushing device into the molding machine, wherein the vacuum transferring step is performed so that both ends are opened at the outlet of the crushing device and the molding machine. The vacuum suction force of the vacuum transfer pipe connected to the upper surface in communication reduces the moisture contained in the wood chips staying on the perforated network, and the sawdust passing through the perforated network is vacuumed even in the process of being transferred to the molding machine through the vacuum transfer tube. It is characterized in that the moisture is reduced by the suction force.

The present invention made as described above has an effect of reducing manufacturing costs and reducing waste disposal costs by recycling discarded waste wood such as waste furniture and construction waste wood as raw materials for solid fuel.

In addition, in the step of forming the prepared waste wood into wood chips, the present invention can naturally gradually reduce the moisture contained in the waste wood while carrying out a crushing process, a crushing process, a screen process, and a repetitive magnetic sorting process. there is.

Accordingly, the drying process, which was essentially carried out in the manufacturing process of solid fuel using conventional waste wood, can be omitted, so the construction cost and maintenance cost of drying facilities can be reduced, and productivity can be improved by reducing the manufacturing time according to the drying process. Improvements can be expected.

In addition, the present invention further includes a vacuum transfer step of vacuum transferring the wood chips discharged through the outlet of the crushing device into the molding machine, so that the moisture contained in the wood chips staying on the perforated network is reduced by the vacuum suction force. The effect can be expected, and the moisture can be reduced by the vacuum suction force even in the process of vacuum transfer of the sawdust passing through the perforated net to the molding machine.

1 and 2 is a manufacturing process diagram of bio-solid fuel using waste wood according to one embodiment of the present invention.
3 and 4 is a schematic illustration for explaining a crushing device and a molding machine according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described so that those skilled in the art can easily implement it. In addition, in the description of the present invention, if it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The object of the present invention is to provide a method for producing solid fuel using waste wood, but is not limited thereto, and various applications and applications as well as solid fuel may be possible. For example, the term waste wood used in the present invention refers to wood components that are treated as waste regardless of where they are used, and waste furniture, for example, belongs to the category of waste wood.

In addition, in the method of manufacturing solid fuel using waste wood according to the present invention, some steps may be omitted, substituted, or added as necessary.

In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to that other element, but intervenes between each element. It should be understood that may be "connected", "coupled" or "connected".

Hereinafter, a method for manufacturing bio-solid fuel using waste wood according to the present invention will be described in more detail with reference to the accompanying drawings.

As shown in the accompanying drawings, FIG. 1, the method for manufacturing fuel pellets using wood raw materials and wood according to the present invention largely includes a waste wood preparation step (S10), a wood chip forming step (S20), and a sawdust forming step ( S30) and a molding step (S40).

The waste wood preparation step (S10) is a step of collecting and preparing waste wood. In the present invention, the waste wood may be any one group or more of waste wood from living systems, waste wood from construction, waste wood from business sites, and forest by-products.

For example, the waste wood in the daily life is waste furniture such as pure wood, plywood or MDF, agricultural waste wood such as ginseng sprigs or mushroom cultivation trees, field trees such as street trees or garden trees, wooden boxes for fruits or fish, playgrounds and parks. It may be preservative waste wood of outdoor facilities.

In addition, the construction waste wood may be waste wood for preservation such as scaffolding, support or earthenware, plywood such as formwork, pallets, demolished wood, building interior and exterior materials, wooden houses, wooden bridges, or fences.

In addition, waste wood from business sites may be sawdust or bark by-products such as sawdust, wood dust, by-products from wood processing plants, pallets, wooden packaging boxes, wire drum lumber, ship dismantled timber, and railway sleepers.

In addition, forest tree by-products are residues of forest work such as logging, and may be roots, branches, or stems.

Next, in the wood chip forming step (S20), the prepared waste wood is crushed and pulverized to a predetermined size to form wood chips.

1, the wood chip forming step (S20) includes a crushing step (S21), a first magnetic sorting step (S22), a crushing step (S23), a second magnetic sorting step (S24), and a screen A step S25 and a third magnetic selection step S26 are included.

The crushing step (S21) is a process of crushing the prepared waste wood to a predetermined size, preferably, the prepared waste wood is crushed to a size of 15 to 30 cm.

The first magnetic sorting step (S22) is a step of sorting and removing metals including iron from the shredded waste wood using a magnet.

The shredded waste wood from which metals are removed through the first magnetic sorting step is transported to a separately provided crushing means (eg, a crusher) using a conveyor belt of a predetermined length, and in this process, foreign substances that may be included in the shredded waste wood (In particular, a foreign material screening operation to filter out a metallic foreign material) may be additionally performed.

The crushing step (S23) is a step of forming wood chips by pulverizing the shredded waste wood from which metals are removed transported through the conveyor belt to a size of 1 to 15 cm.

The second magnetic sorting step (S24) is a step of sorting and removing metals including iron from the wood chips using a magnet.

The wood chips from which metals have been removed through the second magnetic sorting step are transported to a separately prepared vibrating screen using a conveyor belt of a predetermined length, and in this process, foreign substances (especially metallic foreign substances) that may be included in the wood chips are filtered out. A foreign material screening operation may be additionally performed.

The screening step (S25) is a step of inputting the wood chips from which the metals are removed to a vibrating screen to filter out foreign substances contained in the pulverized waste wood and sorting only the wood chips that have passed through the vibrating screen.

The third magnetic sorting step (S26) is a step of sorting and removing metals including iron from the sorted wood chips using a magnet.

In the present invention, the reason why the wood chip formation step is subdivided is that waste wood is contained in waste wood and wood chips in the process of crushing, crushing, screening, first to third magnetic sorting processes, and conveying through a conveyor belt. This is to ensure that the moisture contained in the waste wood or wood chips is reduced naturally and gradually, for example, an effect of reducing the moisture contained in waste wood or wood chips by 1 to 2% by weight can be expected during each process.

In the present invention, wood chips having a size of 1 to 15 cm and a water content of 20 to 35% by weight are prepared through the above wood chip forming step.

Here, if the wood chips are pulverized to a size larger than 15 cm, it takes too long in the subsequent crushing step, resulting in a decrease in overall productivity and an increase in manufacturing cost.

Next, in the sawdust forming step (S30), the wood chips are put into a crushing device to form sawdust.

A crushing device 100 used in the sawdust forming step according to an embodiment of the present invention is shown in FIG.

Referring to Figure 3, the crushing device 100 is provided with a main body 110 of the hopper shape.

The inside of the main body 110 is composed of an empty crushing chamber 111, and an inlet 112 is formed on the upper part of the main body to insert wood chips into the crushing chamber, and on the bottom surface of the main body A discharge port 113 is formed to discharge sawdust formed by crushing wood chips to the outside.

In addition, a crushing member 120 for crushing wood chips introduced into the crushing chamber through the inlet 112 is installed inside the crushing chamber 111 .

The crushing member 120 includes a drive motor (not shown) disposed between the inlet and the outlet in the main body, a rotation shaft 121 fitted to the rotation shaft of the drive motor, and a radial direction along the outer circumferential surface of the rotation shaft. It includes a plurality of crushing blades 122 that are combined and crush the input wood chips.

In addition, a perforated network 130 in which a plurality of perforated holes 131 are arranged is installed inside the main body.

The perforated net 130 is disposed between the outlet 113 and the crushing member 120, and is sufficiently spaced from the outlet 113 so that wood chips can be smoothly crushed by the crushing blade 122 and is adjacent to the crushing blade. It is preferable to install

The perforated net 130 may be formed in a flat plate shape, but it is preferable to have a semicircular or arc shape so that a greater amount of wood chips can be contacted with the crushing blade and crushing work can be performed.

In addition, the perforated hole 131 preferably has a smaller diameter than that of the wood chips so that the wood chips injected through the inlet are not arbitrarily discharged through the outlet.

In the present invention, the sawdust discharged through the outlet is preferably 6 to 10 mm in size, and the perforated hole may have a diameter of about 8 mm so that the sawdust can be smoothly discharged.

Next, the molding step (S40) is a step of forming the sawdust into a solid fuel in the form of pellets.

Figure 4 is a schematic illustration showing a molding machine 200 used in the molding step according to an embodiment of the present invention.

Referring to FIG. 4 , the molding machine 200 largely includes a ring die 210, a compression member 220, and a cutting blade 230.

The ring die 210 has an open upper surface and a closed bottom surface, and is formed in a ring shape with a predetermined thickness including a compression chamber 211, and a plurality of extrusion holes 212 communicating with the compression chamber 212 cover an outer circumferential surface of the ring die 210. They are arranged in a plurality at regular intervals along the line.

The open upper surface of the compression chamber 211 is connected in communication with the outlet 113 of the crushing device, and the sawdust introduced into the compression chamber by the conveying force of a separately provided conveying means is driven by the rotational force of the ring die and the pressure roller to be described later. As it is melted and pulverized by, it is gradually pressurized into the extrusion hole.

The extrusion hole 212 is formed in the form of a nozzle that becomes narrower from the inside to the outside, and is formed to penetrate the inner and outer circumferential surfaces of the ring die, and the compression molded product is extruded out of the ring die through the extrusion hole.

The compression member 220 is vertically installed at the center of the bottom surface of the compression chamber and rotated by a driving motor (not shown), and a base frame 222 coupled to an upper end of the first rotation shaft ), a pair of second rotational shafts 223 installed vertically on the upper surface of the base frame but spaced apart from each other at a predetermined distance, and a bearing 224 installed in a form surrounding the outer circumferential surface of the second rotational shaft, It includes a pressure roller 225 coupled to the bearing and provided in a state capable of free rotation.

The pressure roller is rotated around a second rotational shaft on a base frame rotating along a first rotational shaft 221, and a plurality of toothed protrusions 2251 are formed along the outer circumferential surface so that the outer circumferential surface presses the inner circumferential surface of the compression chamber during the rotation process. can be formed

The tooth protrusion 2251 has a function of stirring so that a large amount of sawdust injected into the compression chamber 211 does not clump together, and the sawdust is gripped between the tooth protrusion and the tooth protrusion, so that it is forcibly introduced between the inner circumferential surface of the compression chamber and the outer circumferential surface of the pressure roller function can be provided.

Meanwhile, sawdust injected into the compression chamber is continuously introduced into the extrusion hole by the pressure roller, gradually compressed inside the extrusion hole, and then protrudes out of the ring die. A cutting blade 230 is provided on the outside of the ring die to cut the compression molded product protruding outward.

The cutting blade 230 is coupled to the inner circumferential surface of the cutting blade rotating plate 240 disposed in a form surrounding the ring die, and rotates along the cutting blade rotating plate 240 to cut the compression molding protruding outward of the ring die at a predetermined rate. Cut into standard pellets.

Next, the present invention further includes a vacuum transfer step of injecting the sawdust discharged through the outlet of the crushing device into the molding machine.

2 and 3, the outlet 113 of the crushing device according to the present invention and the upper part of the molding machine are connected in communication with the vacuum transfer pipe 300, and the vacuum by the vacuum motor (M) and the pump (P) As the suction force acts on the inside of the crushing chamber 111, the effect of reducing the moisture contained in the wood chips staying on the perforated net can be expected, and the sawdust discharged to the outlet is transferred to the molding machine through the vacuum transfer pipe 300 Even during the process, some moisture is removed by the vacuum suction force.

According to the present invention made as described above, economic benefits can be pursued by recycling discarded waste wood as a raw material for solid fuel, and the moisture is naturally reduced in the process of forming the prepared waste wood into wood chips Construction of drying facilities and maintenance costs can be reduced, and when the sawdust discharged from the crushing device is transported to the molding machine, some of the moisture contained in the sawdust is removed by vacuum suction, so that a solid fuel of excellent quality can be manufactured during product molding. It works.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications Equivalents should also be considered as falling within the scope of this invention.

100: crushing device
110: body
111: crushing chamber 112: inlet
113: outlet
120: crushing member
121: rotating shaft 122: crushing blade
130: perforated network 131: perforated hole
200: molding machine
210: ring die
211: compression chamber 212: extrusion hole
220: compression member
221: first rotation axis 222: base frame
223: second rotational shaft 224: bearing
225: pressure roller 2251: tooth protrusion
230: cutting blade
240: cutting blade rotation plate
300: vacuum transfer pipe

Claims (5)

A waste wood preparation step (S10) of collecting and preparing waste wood;
a wood chip forming step (S20) of crushing and pulverizing the waste wood to a predetermined size to form wood chips, but selectively removing metals including iron using a magnetic force after crushing and pulverizing;
A sawdust forming step (S30) of putting the wood chips into a crushing device to form sawdust;
A molding step (S40) of introducing the sawdust into a molding machine to form a solid fuel in the form of pellets;
Bio solid fuel manufacturing method using waste wood, characterized in that it comprises a.
The method of claim 1, wherein the wood chip forming step,
A crushing step of crushing the prepared waste wood to a size of 15 to 30 cm;
A first magnetic sorting step of sorting and removing metals, including iron, from the shredded waste wood using a magnet;
A crushing step of pulverizing the shredded waste wood from which the metals are removed to a size of 1 to 15 cm to form wood chips;
A second magnetic sorting step of sorting and removing metals, including iron, from the wood chips using a magnet;
A screen step of introducing the wood chips from which the metals are removed into a vibrating screen to filter out foreign substances contained in the pulverized waste wood and sorting only the wood chips that have passed through the vibrating screen;
A third magnetic sorting step of sorting and removing metals, including iron, from the sorted wood chips using a magnet,
It is possible to gradually reduce the moisture contained in the waste wood through the crushing process, the crushing process, the screening process, and the repetitive magnetic sorting process, and through this, a separate drying process can be omitted. Bio solid fuel manufacturing method using waste wood to do.
The method of claim 1, wherein the crushing device,
A hopper-shaped main body having an empty inside, an inlet formed on the top, and a discharge port formed on the bottom surface;
A drive motor disposed between the inlet and outlet inside the main body, a rotation shaft fitted to the rotation shaft of the drive motor, and a plurality of crushing blades coupled to the outer circumferential surface of the rotation shaft in a radial direction and crushing the injected wood chips. A crushing member to do,
Waste wood characterized in that it comprises a perforated network disposed between the outlet and the crushing member inside the main body and having a plurality of perforated holes arranged so that the sawdust crushed by the plurality of crushing blades can be discharged to the lower part. Bio solid fuel manufacturing method using.
The method of claim 1, wherein the molding machine,
A ring die having an open upper surface, a closed bottom surface, and a compression chamber inside with a predetermined thickness, in which a plurality of extrusion holes communicating with the compression chamber are arranged in a plurality at regular intervals along the outer circumferential surface;
A first rotational shaft installed vertically in the center of the bottom surface of the compression chamber and rotated by a driving motor, a base frame coupled to an upper end of the first rotational shaft, and vertically installed on the upper surface of the base frame at a predetermined distance from each other A compression member including a pair of second rotational shafts disposed spaced apart from each other, a bearing installed in a form surrounding the outer circumferential surface of the second rotational shaft, and a pressure roller coupled to the bearing and provided in a state capable of free rotation;
Bio-solid fuel production method using waste wood, characterized in that it comprises a cutting blade for cutting the compression molding extruded through the extrusion hole into a pellet form of a predetermined size.
According to claim 1,
Further comprising a vacuum transfer step of vacuum transferring the wood chips discharged through the outlet of the crushing device into the molding machine,
In the vacuum transfer step, the moisture contained in the wood chips staying on the perforated network is reduced by the vacuum suction force of the vacuum transfer pipe, the both ends of which are connected to the outlet of the crusher and the open upper surface of the molding machine, respectively,
Bio solid fuel manufacturing method using waste wood, characterized in that the moisture is reduced by the vacuum suction force even in the process of transferring the sawdust passing through the perforated network to the molding machine through the vacuum transfer pipe.

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