Wet sawdust continuous drying system

Abstract

A continuous wet sawdust drying system comprises a wet sawdust conveying belt (1), a drum screen (2), an impurity conveying belt (3), a wet sawdust feeding belt (4) and a drying system, wherein the drum screen (2) is arranged below the discharging end of the wet sawdust conveying belt, and the upper line of the drum screen (2) is obliquely arranged; the impurity conveying belt (3) is arranged below the lower end of the drum screen; the wet sawdust feeding belt (4) is arranged below the high end of the drum screen; the saw dust drying device can continuously and efficiently dry wet saw dust and is low in production cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of material drying equipment, and in particular relates to a drying system which can continuously and efficiently dry wet sawdust. Background Art

[0002] A large amount of wet sawdust is produced during wood processing, and it generally has high moisture content and a consistent shape. Since wet sawdust is easy to clump when piled up, it has high drying costs and low drying efficiency, which limits its application. If the moisture content of wet sawdust can be effectively reduced, and biomass pellets can be produced alone or mixed with other wood raw materials, experiments have shown that the flame length and calorific value during combustion are very good, which can meet the requirements of high-quality biomass pellet production. However, the current drying equipment has limited water evaporation capacity, making it difficult to efficiently and cost-effectively dry high-moisture wet sawdust. Summary of the invention

[0003] The utility model aims to solve the problems existing in the prior art and provide a wet sawdust continuous drying system which can continuously and efficiently dry wet sawdust and has low production cost.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A wet sawdust continuous drying system, comprising a wet sawdust conveyor belt, a drum screen arranged below the discharge end of the wet sawdust conveyor belt and arranged with an upper line inclined, an impurity conveyor belt arranged below the lower end of the drum screen, a wet sawdust feeding belt arranged below the upper end of the drum screen, and a drying system arranged below the wet sawdust feeding belt;

[0006] The drying system comprises a fuel conveyor belt, a burner, a drying cylinder rotatable along an axis, a storage bin, a cyclone separator, and a moisture exhaust fan which are arranged in sequence;

[0007] The burner comprises a combustion chamber and a mixing chamber arranged in sequence, and a first partition with an open top is arranged between the combustion chamber and the mixing chamber; a semi-open baffle plate arranged in an upper and lower staggered manner is arranged in the mixing chamber to form a curved hot air channel from the combustion chamber to the subsequent drying cylinder; a blower is arranged outside the burner, and an air duct connected to the blower extends into the combustion chamber, and the air outlet of the mixing chamber is connected to the air inlet of the drying cylinder through a pipeline to send hot air into the drying cylinder, and the rear end of the drying cylinder is connected to the storage bin through a pipeline, and the top of the storage bin is connected to the cyclone separator through a pipeline, and the top of the cyclone separator is connected to a dehumidification air duct equipped with a dehumidification fan;

[0008] The feed inlet of the drying cylinder is located below the discharge end of the wet sawdust feeding belt. At least two circles of concentric cylinders are arranged in the drying cylinder. A scooping plate is arranged on the inner wall of each layer of concentric cylinders. The wet sawdust enters each circle of concentric circles for dispersion and distribution. It is scooped up by the scooping plate and dried at the same time. The dried sawdust enters the storage bin. The drying cylinder is supported by at least two double roller brackets and driven to rotate by a gear transmission mechanism.

[0009] Furthermore, the gear transmission mechanism includes a driving motor installed next to the drying cylinder and a reduction gear connected to the output shaft of the driving motor, a driving gear installed on the output shaft of the reduction gear, and a gear ring sleeved outside the drying cylinder and meshing with the driving gear; two rollers supporting the drying cylinder are arranged on the top of the double roller bracket, and a supporting ring supported by the rollers is correspondingly sleeved on the drying cylinder.

[0010] Furthermore, a discharging conveyor belt is provided below the storage bin.

[0011] The utility model can continuously convey wet sawdust to an inclined drum screen. The wet sawdust is broken up and screened in the drum screen, then falls into the wet sawdust feeding belt and then enters the drying drum for drying. Metal, large pieces of wood, etc. mixed in the wet sawdust are naturally separated and fall into the impurity conveyor belt. The drying drum of the utility model adopts an innovatively designed concentric circle drying structure. The wet sawdust is dispersed into each circle of concentric circles. The wet sawdust is thinly spread in each circle of cylinders for dispersion and distribution. Rapid flash evaporation is achieved under the action of hot air, and moisture can be removed efficiently and quickly, solving the problem of material accumulation being difficult to dry quickly. The sawdust after drying is lighter in weight and can be blown into the storage bin with the help of hot air. The sawdust that does not meet the dehumidification requirements continues to remain in the concentric circles and is mixed with the newly entered wet sawdust to continue to be dried, and is dried thoroughly.

[0012] The utility model has the advantages of simplicity, reliability, low investment and maintenance costs, large production capacity, and can efficiently dry large quantities of wet sawdust to meet production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of a drying cylinder supported by a double roller bracket and driven by a gear transmission mechanism;

[0015] Figure 3 It is a side view schematic diagram of the drying cylinder. DETAILED DESCRIPTION

[0016] like Figure 1As shown, a wet sawdust continuous drying system comprises a wet sawdust conveyor belt 1, a drum screen 2 arranged below the discharge end of the wet sawdust conveyor belt and arranged with an upper line inclined, an impurity conveyor belt 3 arranged below the lower end of the drum screen, a wet sawdust feeding belt 4 arranged below the upper end of the drum screen, and a drying system arranged below the wet sawdust feeding belt. The wet sawdust conveyor belt 1 can be composed of a first horizontal conveyor belt 1a and a first climbing conveyor belt 1b, so as to feed the subsequent drum screen 2.

[0017] The drying system comprises a fuel conveyor belt 5, a burner 6, a drying cylinder 7 rotatable along the axis, a storage bin 8, a cyclone separator 9, and a dehumidification air duct 10 arranged in sequence. The fuel conveyor belt 5 can be composed of a second horizontal conveyor belt 5a and a second climbing conveyor belt 5b, so as to facilitate the delivery of fuel to the subsequent burner 6. The burner 6 comprises a combustion chamber 6a and a mixing chamber 6b arranged in sequence, and a partition 6c with an open top is arranged between the combustion chamber and the mixing chamber; a staggered semi-open baffle 6d is arranged in the mixing chamber to form a curved hot air channel from the combustion chamber to the subsequent drying cylinder 7. A blower 11 is arranged outside the burner, and an air duct 12 connected to the blower extends into the combustion chamber. The air outlet of the mixing chamber is connected to the air inlet of the drying cylinder through a pipeline to deliver hot air into the drying cylinder. The rear end of the drying cylinder is connected to the storage bin 8 through a pipeline, and the top of the storage bin is connected to the cyclone separator 9 through a pipeline, and the top of the cyclone separator is connected to the dehumidification air duct 10 equipped with a dehumidification fan.

[0018] The feed inlet of the drying cylinder 7 is located below the discharge end of the wet sawdust feeding belt 4. Figure 1 , Figure 3 As shown, at least two circles of concentric cylinders 7a are arranged in the drying cylinder, and a scavenging plate 7b is arranged on the inner wall of each layer of concentric cylinders. Figure 3 Only a few shaving boards are schematically shown in the figure. The wet sawdust enters each concentric circle for distribution and is dried while being picked up by the shaving board. The dried sawdust enters the storage bin 8. Figure 2 , Figure 3 As shown, the drying cylinder is supported by at least two double roller brackets 16 and driven to rotate by a gear transmission mechanism. The gear transmission mechanism includes a driving motor 17 installed beside the drying cylinder and a reduction box 13 connected to the output shaft of the driving motor, a driving gear 14 installed on the output shaft of the reduction box, and a gear ring 15 sleeved on the outside of the drying cylinder and meshing with the driving gear. Two rollers 16a supporting the drying cylinder are arranged on the top of the double roller bracket 16, and a supporting ring 16b supported by the rollers is correspondingly sleeved on the drying cylinder. After the driving motor 17 is started, it drives the driving gear 14 through the reduction box 13, and the driving gear 14 drives the gear ring 15, thereby driving the drying cylinder 7 to rotate. The gear transmission mechanism and the structure of the double rollers supporting the drying cylinder are both existing technical structures.

[0019] The working process of the utility model is as follows: start the fuel conveyor belt 5 and feed the fuel into the burner 6. The fuel burns in the combustion chamber 6a to produce smoke, which enters the mixing chamber 6. Under the obstruction of the semi-open baffle 6d, most of the smoke is blocked and settled, and the hot smoke enters the drying cylinder backward. Start the wet sawdust conveyor belt 1 to continuously convey the wet sawdust, and start the motor 12 at the same time. After the reduction gear 13 is decelerated, the driving gear 14 is driven to rotate, and then the ring gear 15 and the drying cylinder 7 are driven to rotate. The wet sawdust coming out from the discharge end of the wet sawdust conveyor belt automatically falls into the inclined drum screen 2. The wet sawdust is broken up and screened in the drum screen, and then falls onto the wet sawdust feeding belt 4, and then enters the drying cylinder 7. Metals, large pieces of wood, etc. mixed in the wet sawdust are naturally separated and fall into the impurity conveyor belt 3 for delivery. After the wet sawdust is started to enter the drying cylinder, it is dispersed into each circle of concentric cylinders 7a, so that the wet sawdust is thinned in each circle of cylinders for dispersing and distributing. While the sawdust is repeatedly thrown up and dropped by the material copying plate 7b, the hot air from the burner quickly flashes the wet sawdust, and the moisture is removed efficiently and quickly. The sawdust after drying is light in weight, and is blown into the storage bin 8 with the help of the hot wind from the burner. The sawdust that does not meet the dehumidification requirements continues to stay in the concentric circles and is mixed with the newly entered wet sawdust to continue to be dried until it is dried to be blown out by the hot air. During the transportation and drying process of the wet sawdust, the cyclone separator 9 is started for dust removal, and the dehumidification fan 10a is started to discharge the moisture from the dehumidification air duct 10, so as to achieve standard discharge and be clean and environmentally friendly. The dried sawdust in the storage bin can be discharged to the discharging conveyor belt 18 for sending out, and used for producing biomass fuel, or for other purposes. The utility model can quickly dry high-humidity sawdust with a moisture content of more than 50%, with high drying efficiency and good drying effect.

[0020] Various conveyor belts, burners, drum screens, cyclone separators, etc. in the utility model can all adopt existing technical equipment.

Claims

1. A wet sawdust continuous drying system, characterized in that: It comprises a wet sawdust conveyor belt (1), a drum screen (2) arranged below the discharge end of the wet sawdust conveyor belt and arranged with an upper line inclined, an impurity conveyor belt (3) arranged below the lower end of the drum screen, a wet sawdust feeding belt (4) arranged below the upper end of the drum screen, and a drying system arranged below the wet sawdust feeding belt; The drying system comprises a fuel conveyor belt (5), a burner (6), a drying cylinder (7) rotatable along an axis, a material storage bin (8), a cyclone separator (9), and a moisture removal duct (10) which are arranged in sequence; The burner (6) comprises a combustion chamber (6a) and a mixing chamber (6b) which are arranged in sequence, and a first partition (6c) with an open top is arranged between the combustion chamber and the mixing chamber; a semi-open baffle (6d) which is arranged in an upper and lower staggered manner is arranged in the mixing chamber to form a curved hot air channel from the combustion chamber to the subsequent drying cylinder (7); a blower (11) is arranged outside the burner, and an air duct (12) connected to the blower extends into the combustion chamber; the air outlet of the mixing chamber is connected to the air inlet of the drying cylinder through a pipeline to send hot air into the drying cylinder; the rear end of the drying cylinder is connected to a storage bin (8) through a pipeline, the top of the storage bin is connected to a cyclone separator (9) through a pipeline, and the top of the cyclone separator is connected to a dehumidification air duct (10) equipped with a dehumidification fan (10a); The feed inlet of the drying cylinder (7) is located below the discharge end of the wet sawdust feeding belt (4). At least two circles of concentric cylinders (7a) are arranged in the drying cylinder. A scooping plate (7b) is arranged on the inner wall of each layer of concentric cylinders. The wet sawdust enters each circle of concentric circles for dispersion and distribution. It is scooped up by the scooping plate and dried at the same time. The dried sawdust enters the storage bin (8). The drying cylinder is supported by at least two double roller brackets (16) and driven to rotate by a gear transmission mechanism.

2. A wet sawdust continuous drying system according to claim 1, characterized in that: The gear transmission mechanism comprises a driving motor (17) mounted beside the drying cylinder, a reduction box (13) connected to the output shaft of the driving motor, a driving gear (14) mounted on the output shaft of the reduction box, and a gear ring (15) sleeved outside the drying cylinder and meshing with the driving gear; two rollers (16a) supporting the drying cylinder are arranged on the top of the double roller bracket (16), and a supporting ring (16b) supported by the rollers is correspondingly sleeved on the drying cylinder.

3. A wet sawdust continuous drying system according to claim 1 or 2, characterized in that: A discharge conveyor belt (18) is provided below the storage bin (8).

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