Biomass wood chip fuel screening equipment special for biomass gasification boiler

Abstract

Biomass wood chip fuel screening equipment special for a biomass gasification boiler comprises a material hopper, a material conveyor, a first screening area and a second screening area, the material hopper is connected with the material conveyor, one end of the first screening area is connected with the material conveyor, and the other end of the first screening area is connected with the material conveyor. The first screening zone screens non-fuel substances with the size smaller than a first preset value in biomass wood chip fuel, the size of the second biomass wood chip fuel is smaller than a second preset value, and the size of the third biomass wood chip fuel is larger than the second preset value. The biomass wood chip fuel is screened by the two screening areas, so that the size of the biomass fuel can be more uniform, and the situation that the biomass fuel is stuck or blocked in the feeding process of the boiler due to the fact that the biomass fuel is inconsistent in length is effectively improved; and the content of soil or sand contained in the biomass fuel is reduced, so that the problem that part of the biomass fuel cannot be fully combusted due to boiler grate coking can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of biomass fuels, and in particular to a screening device for biomass wood chip fuels dedicated to biomass gasification boilers Background Art

[0002] Biofuels are fuels produced from renewable organic materials, and their raw materials mainly come from biomass raw materials, including several types: aquatic and terrestrial plants, such as sugarcane, oil palm, miscanthus, etc.; crop residues, such as rice straw, wheat straw, corn straw, corn cobs, etc.; waste wood, such as dry wood, wood scraps, wood chips, waste bamboo joints, bamboo filaments, etc.

[0003] Since the calorific value of biomass fuels is relatively high, biomass fuels can be processed through crushing and further processing to provide fuel for various boilers. However, due to the different lengths of biomass fuels, it may cause material jamming and blockage during the feeding process of the boiler, or the content of soil or sand in the biomass fuel is too high, resulting in boiler coking, causing some biomass fuels not to burn fully and affecting the production efficiency of the boiler.

[0004] Therefore, it is necessary to screen out the soil or sand or biomass fuels that do not meet the size in the crushed biomass fuels to meet the requirements of the boiler for biomass fuels. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is a screening device for biomass wood chip fuels dedicated to biomass gasification boilers.

[0006] The above technical problems of the present invention are achieved through the following technical solutions: A screening device for biomass wood chip fuels dedicated to biomass gasification boilers, comprising: a material hopper for loading the biomass wood chip fuels to be screened; a material conveyor, the material conveyor is connected to the material hopper and is used to convey the biomass wood chip fuels to the first screening area; One end of the first screening area is connected to the material conveyor and is used to screen out non-fuel substances in the biomass wood chip fuels with a size smaller than the first preset value according to the first roller group to obtain the first screened biomass wood chip fuels. A first conveyor for transporting the non-fuel substances screened from the first screened biomass wood chip fuels is arranged below the first screening area, and the first roller group transports the obtained first screened biomass wood chip fuels to the second screening area; One end of the second screening area is connected to the other end of the first screening area, and is used to screen the second biomass wood chip fuel and the third biomass wood chip fuel in the first-screened biomass wood chip fuel according to the second roller group, wherein the size of the second biomass wood chip fuel is smaller than the second preset value, the size of the third biomass wood chip fuel is larger than the second preset value, a second conveyor for transporting the second biomass wood chip fuel is arranged below the second screening area, the other end of the second screening area is connected to a third conveyor for transporting the third biomass wood chip fuel, and the second roller group is used to transport the third biomass wood chip fuel onto the third conveyor.

[0007] By adopting the above technical solution, the biomass wood chip fuel to be screened is placed into the material hopper, and the material conveyor transports the biomass wood chip fuel onto the first screening area, and is screened by the first roller group in the first screening area. While the first roller group is rotating, due to the intermittent gaps between the first rollers, the non-fuel substances (such as soil, sand, debris, etc.) mixed in the biomass wood chip fuel with sizes smaller than the intermittent gaps between the first rollers will fall onto the first conveyor, and the first conveyor will transport these non-fuel substances to the designated position. Due to the continuous rotation of the rollers of the first roller group, the first-screened biomass wood chip fuel that has not fallen will move towards the second screening area along with the rolling of the rollers and finally fall into the second screening area. The second roller group in the second screening area rotates continuously to separate the second biomass wood chip fuel and the third biomass wood chip fuel in the first-screened biomass wood chip fuel. The second biomass wood chip fuel with a size smaller than the distance between the second rollers on the second roller group will fall onto the second conveyor below the second screening area, and the third biomass wood chip fuel with a size larger than the distance between the second rollers on the second roller group will move towards the third conveyor on the second roller group and finally fall onto the third conveyor. By setting two screening areas, the non-combustible substances in the biomass wood chip fuel can be screened out, and the size of the screened biomass wood chip fuel can be made more uniform, thus effectively improving the problems of partial incomplete combustion of biomass fuel caused by excessive coking in the boiler due to too high content of soil or sand in the biomass fuel, or jamming or blocking of the boiler during the feeding process due to inconsistent lengths of the biomass fuel.

[0008] In a further optimized solution, the first screening area includes two relatively arranged first side walls, a first roller group composed of a plurality of first rollers and a first motor. The two first side walls are fixedly installed on the ground, and circular holes are symmetrically arranged on the two first side walls. The first roller group passes through the circular holes on the first side walls and is rotatably connected to the first side walls. First gears are installed on one side of the plurality of rollers, a first chain is sleeved on the first gears, the first motor is arranged on one side of the first roller near the first gear, and the output shaft of the first motor is connected to one end of the first roller.

[0009] For a further optimized solution, the second screening area includes two oppositely arranged second side walls, a second roller group composed of a plurality of second rollers, and a second motor. The two second side walls are fixedly installed on the ground, and circular holes are symmetrically arranged on the two second side walls. The second roller group passes through the circular holes on the second side walls and is rotatably connected to the second side walls. A second gear is installed on one side of each of the plurality of second rollers, a second chain is sleeved on the second gear, the second motor is arranged on one side of the second roller near the second gear, and the output shaft of the second motor is connected to one end of the second roller.

[0010] By adopting the above technical solution, through the arranged gear and chain structure and driven by the motor, it can be ensured that each roller rotates synchronously, preventing the biomass wood chip fuel from accumulating on the rollers due to different rotation speeds between the rollers, and arranging a plurality of rollers to ensure the full screening of the biomass fuel.

[0011] For a further optimized solution, the distance between adjacent first rollers among the plurality of first rollers is less than 10 mm.

[0012] By adopting the above technical solution, setting the distance between adjacent first rollers in the first screening area to be less than 10 mm can fully screen the non-combustible substances in the biomass wood chip fuel while ensuring that the biomass wood chip fuel does not fall below the first screening area.

[0013] For a further optimized solution, the distance between adjacent first rollers among the plurality of first rollers is less than 10 cm.

[0014] By adopting the above technical solution, setting the distance between adjacent second rollers in the second screening area to be less than 10 cm can further screen the biomass wood chip fuel that has passed through the first screening area. The biomass wood chip fuel less than 10 cm will fall onto the second conveyor below the second screening area, and the biomass wood chip fuel greater than 10 cm will ultimately be conveyed to the third conveyor.

[0015] For a further optimized solution, a plurality of first roller plates are evenly distributed on the circumferential surface of the first roller, and the first roller plates on adjacent first rollers are staggered with each other.

[0016] For a further optimized solution, a plurality of second roller plates are evenly distributed on the circumferential surface of the second roller, and the second roller plates on adjacent second rollers are staggered with each other.

[0017] By adopting the above technical solution, by arranging a plurality of roller plates on the rollers and staggering the roller plates on adjacent first rollers, the conveyance of the biomass wood chip fuel between the rollers can be improved and jamming can be prevented.

[0018] For a further optimized solution, the third conveyor is arranged on the side of the second screening area away from the first screening area and is connected to the second screening area, and is perpendicular to the second conveyor above the second conveyor.

[0019] By adopting the above technical solution, the screened biomass wood chip fuel can be transported to different areas to prevent mixing.

[0020] For a further optimized solution, the material conveyor, the first conveyor, the second conveyor and the third conveyor are conveyor belts.

[0021] By adopting the above technical solution, the conveyor belt has a simple structure, is convenient to use, and has high transmission efficiency. For a further optimized solution, a plurality of baffles are provided on the conveyor belt.

[0022] By adopting the above technical solution, the setting of multiple blocking plates can prevent the soil or fuel on the conveyor belt from falling, and improve the screening efficiency.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: By setting two screening areas, and arranging a plurality of rollers in the first screening area, the distance between adjacent rollers is adjusted to be very small, so that the soil or sand in the biomass wood chip fuel can be separated from the biomass wood chip fuel, and is transported to a designated position through the conveyor belt arranged at the lower part of the first screening area. During the rotary screening process, the plurality of rollers will transport the biomass wood chip fuel to the plurality of rollers on the second screening area for further screening. By adjusting the distance between adjacent rollers in the second screening area, the biomass wood chip fuel is further screened into two groups. The biomass wood chip fuel meeting the load requirements will fall through the gaps between the rollers onto the second conveyor belt, and the biomass wood chip fuel that does not fall will be transported to the third conveyor belt along with the rollers on the second screening area, and then after further crushing, it will be screened again to reach the size desired by the customer. The biomass wood chip fuel is screened through two screening areas, so that the size of the biofuel is more uniform, thus effectively improving the situation of material jamming or blockage during the feeding process of the boiler caused by the inconsistent length of the biomass fuel, and since the content of soil or sand in the biomass fuel is reduced, it can effectively improve the problem that partial biomass fuel cannot be fully burned due to boiler slagging.

[0024] By arranging a plurality of conveyor belts, the screened biomass wood chip fuel can be transported to different areas, facilitating subsequent storage and transportation.

[0025] By arranging a plurality of rollers in the screening area, the length of the screening area can be increased, thereby improving the screening effect.

[0026] By arranging a plurality of roller plates on the rollers, and the roller plates between adjacent rollers are staggered with each other, biomass wood chip fuel can be conveyed between the plurality of rollers to prevent accumulation or jamming.

[0027] By arranging a plurality of baffles on the conveyor belt, non-fuel substances or biomass wood chip fuels of different sizes after screening can be conveyed better. Brief Description of the Drawings

[0028] Figure 1 is a schematic diagram of the device of the present application; Figure 2 is another schematic diagram of the device of the present application; Figure 3 is a schematic diagram of the first screening area; Figure 4 is a schematic diagram of the second screening area.

[0029] Reference Signs: 1, material hopper; 2, material conveyor; 3, first screening area; 4, second screening area; 5, first conveyor; 6, second conveyor; 7, third conveyor; 8, baffle; 30, first side wall; 31, first roller; 32, first motor; 33, first gear; 34, first chain; 35, first roller plate; 36, first fixing frame; 40, second side wall; 41, second roller; 42, second motor; 43, second gear; 44, second chain; 45, second roller plate. Detailed Description of the Invention

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention application, it should be noted that, as terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the application.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, as terms such as "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0033] Refer to Figure 1 andFigure 2 , a screening device for biomass wood chip fuel specialized for biomass gasification boilers, comprising a material hopper 1, a material conveyor 2, a first screening area 3, a second screening area 4, a first conveyor 5, a second conveyor 6 and a third conveyor 7. The material hopper 1 is connected to the material conveyor 2, and the material hopper 1 is installed above the material conveyor 2. At the end of the material conveyor 2 in the material conveying direction, a first screening area 3 is connected. At the end of the first screening area 3, a second screening area 4 is connected. Below the first screening area 3, a first conveyor 5 is provided for transporting non-fuel substances or small debris screened out from the biomass wood chip fuel in the first screening area 3 to a designated area. Below the second screening area 4, a second conveyor 6 is provided for transporting the wood chips screened out from the biomass wood chip fuel in the second screening area 4. At the end of the second screening area 4, a third conveyor 7 is connected, which is far from the first screening area 3 and above the second conveyor 6, and is perpendicular to the second conveyor 6, for transporting the too-long biomass wood chip fuel separated from the second screening area 4 to a designated area, and then further crushing and screening it. Through the screening of two screening areas, soil or sand in the biomass wood chip fuel can be separated, and the size of the biomass wood chip fuel can be further separated to reach the size required by the boiler. The too-long biomass wood chip fuel is crushed and then screened again until the required size is reached.

[0034] Preferably, the material conveyor 2, the first conveyor 5, the second conveyor 6 and the third conveyor 7 are belt structures.

[0035] Refer to Figure 3 , wherein, a plurality of first rollers 31 are arranged in the first screening area 3, and both ends of each first roller 31 are connected to two first side walls 30 vertically installed on the ground. The plurality of first rollers 31 are installed between the two first side walls 30. Circular holes for installing the first rollers 31 are opened on the two first side walls 30. The first rollers 31 are rotatably connected to the first side walls 30 through the circular holes. On one side of each first roller 31, that is, outside the first side wall 30, a first gear 33 is installed. A first chain 34 is installed on the first gear 33. The output end of a first motor 32 is fixedly connected to one of the first rollers 31. The first motor 32 is fixedly connected to a fixing frame, and the fixing frame is fixedly connected to the ground.

[0036] Specifically, specifically, a plurality of first rollers 31 are arrayed on the outer surface of the first roller 31, and the roller plates of adjacent first rollers 31 are staggered with each other, so that the biomass fuel can better convey the biomass wood chip fuel while the rollers rotate, preventing accumulation and jamming.

[0037] The structure in the second screening zone 4 is the same as that in the first screening zone 3. The first screening zone 3 has been introduced in detail and will not be elaborated here. The only difference is that the distances between adjacent rollers are different, so as to screen the biomass wood chip fuel. That is, by setting the distances between adjacent rollers, the effect of screening the biomass wood chip fuel can be achieved. In the first screening zone 3, it is to screen non-fuel substances in the biomass wood chip fuel, such as soil, sand, etc. Therefore, the distance between adjacent first rollers 31 in the first screening zone 3 is preferably less than or equal to 10 mm. In this way, while helping to fully screen the soil or sand, it can ensure that the biomass wood chip fuel is not screened. And the distance between adjacent second rollers 41 in the second screening zone 4 is preferably less than or equal to 10 cm, so as to ensure the fuel size required by the boiler.

[0038] The screening principle of this application is to achieve the purpose of screening the size of the biomass wood fuel by setting the distances between adjacent rollers, and multiple rollers can play the role of conveying the biomass wood chip fuel.

[0039] In the specific implementation process, first place the biomass wood chip fuel to be screened into the material hopper 1, then start the material conveyor 2. The material conveyor 2 will convey the biomass wood chip fuel to be screened to the first screening zone 3. Then start the first motor 32. The first motor 32 drives the first roller 31 to rotate. After the first roller 31 rotates, it drives the gear to rotate, and the gear drives the chain to rotate, so that multiple first rollers 31 rotate. While the first rollers 31 rotate, they drive the biomass wood chip fuel to move towards the second screening zone 4. At the same time, due to the distance between adjacent first rollers 31, the soil or sand in the biomass wood chip fuel will fall onto the first conveyor 5 below the first screening zone 3. The biomass wood chip fuel that has been preliminarily screened will fall onto the second screening zone 4 as the first rollers 31 rotate. Then start the second motor 42. The second motor 42 drives multiple second rollers 41 on the second screening zone 4 to rotate to further screen the biomass wood chip fuel. Due to the distance between adjacent second rollers 41, the wood chips in the biomass wood chip fuel with a size smaller than the distance between adjacent second rollers 41 will then fall onto the second conveyor 6 below the second screening. The wood chips in the biomass wood chip fuel with a size larger than the distance between adjacent second rollers 41 will be transported by multiple second rollers 41 to the third conveyor 7, and then be crushed and screened again.

[0040] The embodiments of the implementation manners of the present invention are all preferred embodiments of this application, and do not limit the protection scope of the application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

[0041] In addition, those of ordinary skill in the art should understand that the provided drawings are only for illustrating the purpose, features, and advantages of the present invention, and the drawings are not actually drawn to scale.

Claims

1. A biomass wood chip fuel screening device suitable for biomass gasification boiler, characterized in that: include: A material hopper (1) for containing biomass wood chip fuel to be screened; A material conveyor (2), the material conveyor (2) being connected to the material hopper (1) and being used for conveying the biomass wood chip fuel to the first screening area (3); One end of the first screening section (3) is connected to the material conveyor (2) and is used to screen non-fuel substances in the biomass wood chip fuel whose size is smaller than a first preset value according to the first roller (31) group to obtain first screened biomass wood chip fuel. A first conveyor (5) for transporting the non-fuel substances screened from the first screened biomass wood chip fuel is arranged below the first screening section (3). The first roller (31) group transports the obtained first screened biomass wood chip fuel to the second screening section (4); One end of the second screening zone (4) is connected to the other end of the first screening zone (3), and is used to screen the second biomass wood chip fuel and the third biomass wood chip fuel in the first screened biomass wood chip fuel according to the second roller (41) group, wherein the size of the second biomass wood chip fuel is smaller than the second preset value, and the size of the third biomass wood chip fuel is larger than the second preset value. A second conveyor (6) for transporting the second biomass wood chip fuel is arranged below the second screening zone (4), and the other end of the second screening zone (4) is connected to a third conveyor (7) for transporting the third biomass wood chip fuel, and the second roller (41) group is used to transport the third biomass wood chip fuel to the third conveyor (7).

2. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 1 is characterized in that: The first screening section (3) comprises two first side walls (30) arranged opposite to each other, a first roller group consisting of a plurality of first rollers (31) and a first motor (32); the two first side walls (30) are fixedly mounted on the ground; the two first side walls (30) are symmetrically provided with circular holes; the first roller (31) group passes through the circular holes on the first side walls (30) and is rotatably connected to the first side walls (30); a first gear (33) is mounted on one side of the plurality of first rollers (31); a first chain (34) is sleeved on the first gear (33); the first motor (32) is arranged on one side of the first roller (31) near the first gear (33); and an output shaft of the first motor (32) is connected to one end of the first roller (31).

3. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 1 is characterized in that: The second screening section (4) comprises two second side walls (40) arranged opposite to each other, a second roller group consisting of a plurality of second rollers (41) and a second motor (42); the two second side walls (40) are fixedly mounted on the ground; the two second side walls (40) are symmetrically provided with circular holes; the second roller (41) group passes through the circular holes on the second side walls (40) and is rotatably connected to the second side walls (40); a second gear (43) is mounted on one side of the plurality of second rollers (41); a second chain (44) is sleeved on the second gear (43); the second motor (42) is arranged on one side of the second roller (41) near the second gear (43); and an output shaft of the second motor (42) is connected to one end of the second roller (41).

4. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 2 is characterized in that: The distance between adjacent first rollers (31) among the plurality of first rollers (31) is less than 10 mm.

5. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 3 is characterized in that: The distance between adjacent second rollers (41) among the plurality of second rollers (41) is less than 10 cm.

6. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 2 or 4, characterized in that: A plurality of first roller plates (35) are evenly distributed on the circumference of the first roller (31), and the first roller plates (35) on adjacent first rollers (31) are staggered.

7. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 3 or 5, characterized in that: A plurality of second roller plates (45) are evenly distributed on the circumference of the second roller (41), and the second roller plates (45) on adjacent second rollers (41) are staggered.

8. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 1 is characterized in that: The third conveyor (7) is arranged on a side of the second screening section (4) away from the first screening section (3) and is connected to the second screening section (4), and is above the second conveyor (6) and perpendicular to the second conveyor (6).

9. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 1 is characterized in that: The material conveyor (2), the first conveyor (5), the second conveyor (6) and the third conveyor (7) are conveyor belts.

10. The biomass wood chip fuel screening equipment adapted to biomass gasification boiler according to claim 9 is characterized in that: A plurality of baffles (8) are arranged on the conveyor belt.

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