Countercurrent material drying machine using wet eucalyptus bark as fuel
The countercurrent material dryer addresses the inefficiencies of eucalyptus bark utilization by employing a reverse flow design to ensure complete combustion and uniform drying, thereby reducing costs and energy consumption.
Patent Information
- Application Number
- CN202421296790.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Existing drying equipment faces high production costs and incomplete combustion issues due to the use of biomass pellets, while eucalyptus bark, despite being a viable fuel, is difficult to handle and requires high energy consumption for drying, making its utilization inefficient.
A countercurrent material dryer design that utilizes wet eucalyptus bark as fuel, featuring a screw conveyor, hot air furnace, drying cylinder, and countercurrent feeding device, allowing for efficient drying by reversing the material flow relative to flue gas flow, ensuring complete combustion and uniform drying.
The dryer effectively utilizes eucalyptus bark as fuel, reducing production costs and energy consumption while achieving efficient and uniform drying by ensuring complete combustion and balanced heat exchange.
Smart Images
Figure CN222165594U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of drying equipment, and specifically relates to equipment which can directly utilize high-humidity eucalyptus bark as fuel to generate hot air flow to dry materials. Background Art
[0002] Biomass pellet fuels are mostly block, rod or granular fuel particles produced by pellet forming machines from rice husks, peanut shells, corn cobs, tea shells, cottonseed shells and "three wastes". At present, many drying equipment used in industrial production use clean and environmentally friendly biomass pellets as fuel, resulting in relatively high production costs. In addition, the fuel combustion chambers of many drying equipment are relatively small. Due to the high density of biomass pellets, incomplete combustion will occur, resulting in greater fuel consumption and waste.
[0003] In southern my country, there are many eucalyptus trees, so there are also a lot of eucalyptus barks. Because the fibers of eucalyptus bark are long, difficult to crush, easy to agglomerate, and troublesome to handle, they are usually peeled and discarded, which wastes resources and becomes a flammable hazard. Dried eucalyptus bark is a very good fuel. If it is used as fuel for drying equipment, it can not only recycle waste, but also greatly reduce production costs. However, since eucalyptus bark is easy to agglomerate and has high humidity, it must be dried before it can be used as fuel. However, the various existing drying methods are not only troublesome to handle the agglomerated long fibers and take a long time to handle, but also have high energy consumption, which makes it difficult to effectively utilize the bark. Utility Model Content
[0004] The utility model aims to solve the problems existing in the prior art and provide a countercurrent material dryer which can directly use wet eucalyptus bark as fuel.
[0005] The technical solution adopted by the utility model is as follows:
[0006] A countercurrent material dryer using wet eucalyptus bark as fuel comprises a screw conveyor, a hot air furnace, a drying cylinder, a cyclone bag dust collector, and a dehumidifying fan arranged in sequence, and a feeding belt conveyor and a discharging belt conveyor respectively arranged above the rear end and below the front end of the drying cylinder; the screw conveyor is used to convey eucalyptus bark, and the discharging end of the screw conveyor is provided with a section of round pipe, which is inserted into the partition wall between the screw conveyor and the hot air furnace; the hot air furnace comprises a combustion chamber and a mixing chamber arranged in sequence, a first partition with an open top is arranged between the combustion chamber and the mixing chamber, and a stepped grate is arranged in the combustion chamber; a semi-open baffle arranged in an upper and lower staggered manner is arranged in the mixing chamber to form a curved path from the combustion chamber to the subsequent drying cylinder Linear hot air channel; a blower is arranged outside the hot air furnace, and the air duct 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, the rear end of the drying cylinder is connected to the cyclone bag dust collector through a pipeline, and the top of the cyclone bag dust collector is connected to the dehumidification air duct equipped with a dehumidification fan; the feed port of the drying cylinder is located at the rear end, and the discharge port is located at the front end, and a countercurrent feeding device for pushing materials from the rear end to the front end is arranged in the drying cylinder; the drying cylinder is supported by at least two double roller brackets and driven to rotate by a gear transmission mechanism; the material to be dried enters from the feed port at the rear end of the drying cylinder, is pushed and gradually dehydrated by the countercurrent feeding device in the drying cylinder, and is discharged from the discharge port at the front end of the drying cylinder after drying.
[0007] 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.
[0008] Furthermore, the countercurrent feeding device comprises a group of material-scraping plates respectively welded to the inner wall of the drying cylinder and a central material-scraping frame arranged along the axial direction of the drying cylinder.
[0009] Furthermore, the wet eucalyptus bark is eucalyptus bark with a humidity not exceeding 35%.
[0010] Furthermore, the screw conveyor is a double screw conveyor.
[0011] Furthermore, more than two screw conveyors are arranged in parallel, and the discharge ends of all the screw conveyors are connected to the hot air furnace at the same horizontal plane.
[0012] By adopting the utility model, the messy and clumped eucalyptus bark can be squeezed and transported to the hot air furnace and fully burned in the combustion chamber. The material to be dried is fed in the reverse direction opposite to the forward direction of the flue gas, and can be fully contacted with the flue gas to be dried. The drying cylinder of the utility model adopts a uniquely designed countercurrent feeding device, which adopts a combination of a sifting plate segment and a concentric circle segment. The material is fed into each layer of the concentric circle through the sifting plate. Each layer of the concentric circle constitutes a drying layer. The material is dispersed by the frying plate to each layer of the concentric cylinder. The material is spread out in layers for drying, which can effectively avoid material accumulation. The material is evenly and fully contacted with the hot flue gas, and the drying is uniform and efficient, with good drying effect.
[0013] The utility model can well use the waste that is difficult to utilize as fuel, and the combustion is sufficient with low energy consumption. The flow direction of the material to be dried is opposite to the flow direction of the flue gas, the heat exchange is sufficient and balanced, the drying efficiency is high, and the drying effect is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the dryer of the utility model;
[0015] Figure 2 yes Figure 1 A top view of the screw conveyor and hot air furnace;
[0016] Figure 3 This is the AA cross-section of the drying cylinder. DETAILED DESCRIPTION
[0017] like Figure 1 , Figure 3 As shown, a countercurrent material dryer that can directly use wet eucalyptus bark with a humidity not exceeding 35% as fuel includes a screw conveyor 1, a hot air furnace 2, a drying cylinder 3, a cyclone bag dust collector 4, a dehumidifying fan 5, which are arranged in sequence, and a feed belt 6 and a discharge belt 7 which are respectively arranged above the rear end and below the front end of the drying cylinder. The screw conveyor is used to convey eucalyptus bark. This embodiment adopts a double screw conveyor. The discharge end of the screw conveyor is provided with a section of round pipe 1a, and the round pipe is inserted into the partition wall 8 between the screw conveyor and the hot air furnace. The round pipe section can squeeze and compact the eucalyptus bark conveyed by the screw conveyor to naturally form a material plug, thereby reducing air leakage at the fuel inlet of the combustion chamber. Normally, the screw conveyor 1 is as shown in FIG. Figure 2As shown, more than two are arranged in parallel, and the discharge ends of all screw conveyors are connected to the hot blast furnace 2 at the same horizontal plane to improve production capacity. The hot blast furnace includes a combustion chamber 2a and a mixing chamber 2b arranged in sequence, and a first baffle 2c with an open top is arranged between the combustion chamber and the mixing chamber, and a stepped grate 2d that is gradually lowered is arranged in the combustion chamber. The eucalyptus bark entering the combustion chamber of the hot blast furnace will automatically turn over and spread along the stepped grate to promote the combustion of the eucalyptus bark. Start the blower 9, and the blower blows wind from the bottom of the grate through the air duct 10 to blow the eucalyptus bark into suspension and replenish the oxygen in the combustion chamber, so that the wet eucalyptus bark can be fully burned. A semi-open baffle 2e arranged in an upper and lower staggered manner is provided in the mixing chamber to form a curved hot air channel from the combustion chamber to the subsequent drying cylinder. Most of the dust generated by combustion is blocked and settled by the baffle, and the clean flue gas enters the subsequent drying cylinder to dry the material. The air outlet of the mixing chamber is connected to the air inlet of the drying cylinder through a pipeline, the rear end of the drying cylinder is connected to the cyclone bag dust collector 4 through a pipeline, and the top of the cyclone bag dust collector is connected to the dehumidification air duct 5 equipped with a dehumidification fan. The feed port of the drying cylinder 3 is located at the rear end, and the discharge port is located at the front end. A countercurrent feeding device 11 is provided in the drying cylinder to push the material from the rear end to the front end. The material to be dried is transported by the feed belt conveyor 6 and falls into the feed port at the rear end of the drying cylinder. After entering the drying cylinder, it is pushed by the countercurrent feeding device 11 and gradually dehydrated. After drying, the material is discharged from the discharge port at the front end of the drying cylinder and falls on the discharge belt conveyor 7. At this time, the material temperature is still high, and the water will continue to evaporate after the discharge, realizing the full dehydration function.
[0018] The drying cylinder is supported by at least two double roller brackets 16 and driven to rotate by a gear transmission mechanism. 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 mounted on the drying cylinder. The gear transmission mechanism includes a driving motor 12 installed beside the drying cylinder, 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 mounted outside the drying cylinder and meshing with the driving gear. After the driving motor 12 is started, the driving gear 14 is driven by the reduction box 13, and the driving gear 14 drives the gear ring 15, thereby driving the drying cylinder to rotate. The gear transmission mechanism and the structure of the double rollers supporting the drying cylinder are both existing technical structures.
[0019] See further Figure 1 and Figure 3The countercurrent feeding device 11 includes a group of scooping plates 11a respectively welded to the inner wall of the drying cylinder and a central scooping rack 11b arranged along the axial direction of the drying cylinder. The central scooping rack 11b can be welded to the wall of the drying cylinder through the radial rods at the end. After the material to be dried enters the drying cylinder, it is scooped up and dropped by the scooping plates 11a, and then caught, thrown up, and dropped by the central scooping rack 11b in the middle. The material is repeatedly scooped up, dropped, and scattered during the forward process, and is dried efficiently and quickly. The temperature of the material is high when the drying cylinder is discharged, and the water will continue to evaporate after the discharge to achieve full dehydration.
[0020] The drying method of the countercurrent material dryer of the utility model is as follows: a screw conveyor 1 is used to convey the wet eucalyptus bark to the hot blast furnace 2, and the round pipe section at the discharge end of the screw conveyor squeezes and compacts the eucalyptus bark to form a material plug naturally, thereby reducing air leakage in the combustion chamber of the hot blast furnace and maintaining a stable temperature in the hot blast furnace; the eucalyptus bark entering the combustion chamber of the hot blast furnace is automatically turned over and scattered along the stepped grate 2d; the blower 9 is started, and the wind force blown from the bottom of the stepped grate by the blower through the air duct 10 blows the eucalyptus bark up and suspends it, and supplements the oxygen required for combustion, so that the eucalyptus bark is fully burned; the smoke after combustion is burned out in the mixing chamber, and the mixture is mixed with the mixture to form a mixed gas. The baffle 2e in the combining chamber 2b blocks most of the dust from settling and then enters the subsequent drying cylinder 3 for drying; the feeding belt conveyor 6 on the top of the drying cylinder feeds the material to be dried into the drying cylinder, and the material is fed in the opposite direction of the flue gas through the countercurrent feeding device 11, and the material is dispersed into each layer of the concentric cylinder through the copying plate, and the material is fully contacted with the hot flue gas and dried. After the material is dried, it is sent out and falls on the discharging belt conveyor 7; the exhaust gas after the material is dried enters the cyclone bag dust collector 4, and the moisture generated by the drying material is exhausted by the dehumidification fan 5a and discharged into the atmosphere through the dehumidification air duct 5.
Claims
1. A countercurrent material dryer using moist eucalyptus bark as fuel, characterized in that: The invention comprises a screw conveyor (1), a hot air furnace (2), a drying cylinder (3), a cyclone bag dust collector (4), a dehumidification air duct (5), and a feeding belt conveyor (6) and a discharging belt conveyor (7) respectively arranged above the rear end and below the front end of the drying cylinder; the screw conveyor is used to convey eucalyptus bark, and the discharging end of the screw conveyor is provided with a section of round pipe (1a), which is inserted into a partition wall (8) between the screw conveyor and the hot air furnace; the hot air furnace comprises a combustion chamber (2a) and a mixing chamber (2b) arranged in sequence, a first partition plate (2c) with an open top is arranged between the combustion chamber and the mixing chamber, and a stepped grate (2d) with a step-down structure is arranged in the combustion chamber; a semi-open baffle plate (2e) arranged in an upper and lower staggered manner is provided in the mixing chamber to form a continuous flow from the combustion chamber to the subsequent drying chamber; The invention discloses a drying cylinder having a curved hot air passage; a blower (9) is arranged outside the hot air furnace, an air duct (10) connected to the blower extends into the combustion chamber, an air outlet of the mixing chamber is connected to an air inlet of the drying cylinder through a pipeline, a rear end of the drying cylinder is connected to a cyclone bag dust collector through a pipeline, and a dehumidification air duct (5) equipped with a dehumidification fan (5a) is connected to the top of the cyclone bag dust collector; the feed inlet of the drying cylinder is located at the rear end, the discharge outlet is located at the front end, and a countercurrent feeding device (11) for pushing the material from the rear end to the front end is arranged in the drying cylinder; the drying cylinder is supported by at least two double roller brackets (16) and driven to rotate by a gear transmission mechanism; the material to be dried enters from the feed inlet at the rear end of the drying cylinder, is pushed and gradually dehydrated in the drying cylinder by the countercurrent feeding device, and is discharged from the discharge outlet at the front end of the drying cylinder after drying.
2. The countercurrent material dryer using moist eucalyptus bark as fuel according to claim 1, characterized in that: The gear transmission mechanism comprises a driving motor (12) 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. The countercurrent material dryer using moist eucalyptus bark as fuel according to claim 1, characterized in that: The countercurrent feeding device (11) comprises a group of material-scraping plates (11a) respectively welded to the inner wall of the drying cylinder and a central material-scraping frame (11b) arranged along the axial direction of the drying cylinder.
4. The countercurrent material dryer using moist eucalyptus bark as fuel according to claim 1, characterized in that: The wet eucalyptus bark is eucalyptus bark with a humidity not exceeding 35%.
5. The countercurrent material dryer using moist eucalyptus bark as fuel according to claim 1, 2, 3 or 4, characterized in that: The screw conveyor (1) is a double screw conveyor.
6. The countercurrent material dryer using moist eucalyptus bark as fuel according to claim 1, 2, 3 or 4, characterized in that: More than two screw conveyors (1) are arranged in parallel, and the discharge ends of all the screw conveyors are connected to the hot air furnace (2) at the same horizontal plane.