Wood raw material sectional type drying treatment device
By adopting a segmented drying treatment device in the wood drying device, combined with the downstream and countercurrent drying technology, the problems of high operating costs, large space and fire hazards in the prior art are solved, and a low-cost and efficient wood drying effect is achieved.
Patent Information
- Application Number
- CN202421491081.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing wood drying device has high operating costs and large space due to the lengthening and thickening of the drying tube, and is prone to fire due to inadvertent parameter control, which has low drying efficiency.
The wood raw material segmented drying treatment device is adopted, including a heat exchanger, a drum drying unit, a gravity countercurrent drying tower and a dust removal unit. By combining downstream drying and countercurrent drying, the drying efficiency is improved and fire hazards are avoided.
Low-cost and efficient wood drying is achieved, fire risk is avoided, operating costs are reduced, and space is occupied.
Smart Images
Figure CN222812064U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wood processing devices, in particular to a sectional drying processing device for wood raw materials. Background Art
[0002] In the wood-based panel industry, the broken wood (wood chips, shavings, or wood chips) needs a drying process to make the material reach the appropriate moisture value before molding. In particular, the drying process accounts for 70%-80% of the production energy consumption in particleboard production. The drying quality has a great impact on the quality of the finished product, and the drying process is very important. At present, most of the domestic and foreign methods use convection heating drying method, the heat transfer medium is flue gas, and the closed drum drying technology, that is, the closed drum is rotated continuously, with a feed port and an air inlet in the front, and a discharge port and an air outlet in the back. The material and the flue gas enter from the feed port and flow in the same direction, that is, downstream; the material in the drum continuously transfers heat with the hot gas and moves slowly backward. When it reaches the discharge port, it is dried, and the flue gas flows backward quickly, cools down, and the mixed water is discharged through purification. Due to the influence of factors such as the type, shape and water output rate of wood, it is difficult to achieve a suitable drying effect. The conventional practice is to continuously lengthen and thicken the drying drum to prolong the material's residence time in the drying drum. This practice increases the operating cost and occupied space, and may also cause a fire due to careless parameter control. Utility Model Content
[0003] Aiming at the problems in the prior art of lengthening and thickening the drying cylinder, which leads to high operating costs, large space occupation, and easy fires caused by careless parameter control, the deceleration stage of the wood drying curve and the increase of the drying cylinder are low in cost performance, the flue gas temperature is low in the rear section of the drying cylinder, the water saturation is high, and the drying efficiency is low, a sectional drying processing device for wood raw materials is proposed. The utility model provides the following technical solutions:
[0004] A sectional drying and processing device for wood raw materials comprises a heat exchanger for separating dry heat and wet cold air and a drum drying unit for drying wet materials, wherein the discharge end of the drum drying unit is connected to a horizontal conveying unit, the discharge end of the horizontal conveying unit is connected to a vertical lifting and conveying unit for lifting materials, the discharge end of the vertical lifting and conveying unit is connected to a gravity countercurrent drying tower, the discharge end of the gravity countercurrent drying tower is connected to a dust removal unit via a negative pressure pipeline, and a fan is installed on the negative pressure pipeline; the heat exchanger is respectively connected to the drum drying unit, the gravity countercurrent drying tower and the negative pressure pipeline.
[0005] Preferably, the drum drying unit comprises a feed drum and a drive motor, and the drive motor drives the feed drum to rotate.
[0006] Preferably, the gravity countercurrent drying tower comprises a silo and a material guide plate arranged in the silo, and the volume of the silo is greater than the volume of the drum drying unit.
[0007] Preferably, the heat exchanger includes a main body, an air inlet, a humid hot gas inlet, a humid cold gas outlet and a dry hot gas outlet, the humid hot gas inlet is connected to the discharge end of the conveying roller, the humid cold gas outlet is connected to the negative pressure pipe, and the dry hot gas outlet is connected to the silo.
[0008] Preferably, the hot gas outlet is connected to the bottom of the silo.
[0009] Preferably, a moisture content detector is installed around the bottom of the silo.
[0010] Preferably, the fan is arranged on the outlet side of the dust collector.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] The utility model reasonably utilizes the advantages of downstream drying in the first stage, and the high-temperature flue gas contacts the wettest material first, thereby improving the exchange efficiency and avoiding the hidden danger of fire, while the low-temperature dry air is the opposite; the utility model reasonably utilizes the advantages of countercurrent drying in the second stage, so that the driest airflow contacts the driest material first, thereby improving the efficiency; the deceleration drying stage in the wood drying curve is reasonably avoided, and the material can be dried in the gravity countercurrent drying tower for a long time, thereby improving the product quality; the cost is low, and the gravity countercurrent drying tower can be made of cheap materials without fine processing, and the drum drying unit is greatly shortened, and the gravity countercurrent drying tower can be combined with the silo; the operating cost is low, and the second stage of drying does not require flipping movement in the feed drum, and almost no power is required; the utility model occupies less space, and the block structure can make full use of the three-dimensional layout space and save space utilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model;
[0014] In the attached drawings, 1. drum drying unit; 11. feed roller; 12. drive motor; 2. horizontal conveying unit; 3. vertical lifting and conveying unit; 4. heat exchanger; 41. air inlet; 42. hot and humid gas inlet; 43. hot and dry gas outlet; 44. cold and humid gas outlet; 5. gravity countercurrent drying tower; 51. silo; 52. feed guide plate; 6. moisture content detector; 7. negative pressure pipeline; 8. dust removal unit; 9. fan. DETAILED DESCRIPTION
[0015] The directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention of the utility model.
[0016] like Figure 1 As shown, a wood raw material segmented drying processing device includes a heat exchanger 4 for separating dry heat and wet cold air and a drum drying unit 1 for drying wet materials, the discharge end of the drum drying unit 1 is connected to a horizontal conveying unit 2, the discharge end of the horizontal conveying unit 2 is connected to a vertical lifting conveying unit 3 for lifting materials, the discharge end of the vertical lifting conveying unit 3 is connected to a gravity countercurrent drying tower 5, the discharge end of the gravity countercurrent drying tower 5 is connected to a dust removal unit 8 through a negative pressure pipeline 7, and the negative pressure pipeline 7 is installed with The fan 9; the heat exchanger 4 is connected to the drum drying unit 1, the gravity countercurrent drying tower 5 and the negative pressure pipe 7 respectively; in the first stage, the advantages of downstream drying are reasonably utilized, and the high-temperature flue gas contacts the wettest material first, thereby improving the exchange efficiency and avoiding the hidden danger of fire, while the low-temperature dry air is the opposite; in the second stage, the advantages of countercurrent drying are reasonably utilized, and the driest airflow contacts the driest material first, thereby improving the efficiency; the deceleration drying stage in the wood drying curve is reasonably avoided, and the material can be dried in the gravity countercurrent drying tower 5 for a long time, thereby improving the product quality.
[0017] Furthermore, the drum drying unit 1 includes a feeding drum 11 and a driving motor 12 , and the driving motor 12 drives the feeding drum 11 to rotate.
[0018] Specifically, the horizontal conveying unit 2 and the vertical lifting conveying unit 3 both use augers.
[0019] Furthermore, the gravity countercurrent drying tower 5 includes a silo 51 and a material guide plate 52 disposed in the silo 51 , and the material guide plate 52 is bent in an arc shape; the volume of the silo 51 is greater than the volume of the drum drying unit 1 .
[0020] Furthermore, the heat exchanger 4 includes a main body, an air inlet 41, a humid hot gas inlet 42, a humid cold gas outlet 44 and a dry hot gas outlet 43. The humid hot gas inlet 42 is connected to the discharge end of the feed roller 11, the humid cold gas outlet 44 is connected to the negative pressure pipe 7, and the dry hot gas outlet 43 is connected to the silo 51; the drying principle is fully utilized. In addition to being related to temperature, material drying is also closely related to humidity and air circulation. In the present invention, the moisture is replaced with dry air in time, and at the same time, the air circulation can be increased to dry the material and reduce costs.
[0021] Furthermore, a bottom side wall of the silo 51 is provided with an annular air inlet, and the hot gas outlet is connected to the annular air inlet of the silo 51 .
[0022] Furthermore, a moisture detector 6 is installed around the bottom of the silo 51; a control unit for adjusting the air volume according to the moisture content can be connected to the outside of the moisture detector. The control unit is a mature component in the existing automation technology field, so it will not be described in detail.
[0023] Furthermore, the fan 9 is arranged at the outlet side of the dust collector.
[0024] The utility model has low manufacturing cost, the gravity countercurrent drying tower 5 can be made of cheap materials without fine processing, the drum drying unit 1 is greatly shortened, and the gravity countercurrent drying tower 5 can be combined with the silo 51; the operating cost is low, the second stage drying does not need to flip in the feed drum 11, and almost no power is required; less space is occupied, and the block structure of the utility model can make full use of the three-dimensional layout space and save space.
[0025] Detailed working process: high-humidity materials and high-temperature hot flue gas enter from the front end of the conveying roller 11, and the high-temperature flue gas and high-humidity materials fully exchange heat in the conveying roller 11, and the materials are quickly heated up, and then the moisture of the materials is quickly mixed with the flue gas until the rear section of the conveying roller 11, and the hot and humid flue gas enters the heat exchanger 4, transfers the heat energy to the dry air, and becomes low-temperature wet air and is discharged through the dust removal and fan 9; the dry and warm air enters the lower part of the gravity countercurrent drying tower 5, and first contacts and convects with the driest material descending, forming a countercurrent flow with the material; fully exchange moisture, and then the wet air with moisture is also discharged through the dust removal and fan 9;
[0026] Material flow process: the material coming out of the feeding roller 11 is conveyed horizontally and vertically, and enters from the upper part of the gravity countercurrent drying tower 5. Under the action of gravity and other external forces, it slowly descends and exchanges moisture with the oncoming wind. The further it goes down, the less moisture it contains, and the lower the moisture content of the hot air it encounters. During the downward process of the material, the moisture content detector 6 transmits the moisture content of the material to the control unit in real time. The control unit adjusts the air volume according to the moisture content to ensure the consistency of the quality of the material and facilitate digital automatic control. The dried material enters the subsequent process through the discharge port of the silo 51. The volume utilization rate of the silo 51 is higher than that of the roller, and the speed of the material falling can be controlled according to demand.
Claims
1. A sectional drying device for wood raw materials, characterized in that: The invention comprises a heat exchanger (4) for separating dry heat and wet cold air and a drum drying unit (1) for drying wet materials, wherein the discharge end of the drum drying unit (1) is connected to a horizontal conveying unit (2), the discharge end of the horizontal conveying unit (2) is connected to a vertical lifting conveying unit (3) for lifting materials, the discharge end of the vertical lifting conveying unit (3) is connected to a gravity countercurrent drying tower (5), the discharge end of the gravity countercurrent drying tower (5) is connected to a dust removal unit (8) via a negative pressure pipeline (7), and a fan (9) is installed on the negative pressure pipeline (7); the heat exchanger (4) is respectively connected to the drum drying unit (1), the gravity countercurrent drying tower (5) and the negative pressure pipeline (7).
2. The wood material segmented drying device according to claim 1, characterized in that: The drum drying unit (1) comprises a feeding drum (11) and a driving motor (12), and the driving motor (12) drives the feeding drum (11) to rotate.
3. The wood material segmented drying device according to claim 2, characterized in that: The gravity countercurrent drying tower (5) comprises a material bin (51) and a material guide plate (52) arranged in the material bin (51); the volume of the material bin (51) is greater than the volume of the drum drying unit (1).
4. The wood material segmented drying device according to claim 3, characterized in that: The heat exchanger (4) comprises a body, an air inlet (41), a moist hot gas inlet (42), a moist cold gas outlet (44) and a dry hot gas outlet (43); the moist hot gas inlet (42) is connected to a discharge end of a feed roller (11); the moist cold gas outlet (44) is connected to a negative pressure pipe (7); and the dry hot gas outlet (43) is connected to a silo (51).
5. The wood material segmented drying device according to claim 4, characterized in that: The hot gas outlet is connected to the bottom of the silo (51).
6. The wood material segmented drying device according to claim 3, characterized in that: A moisture content detector (6) is installed around the bottom of the silo (51).
7. The wood material segmented drying device according to claim 1, characterized in that: The fan (9) is arranged on the outlet side of the dust collector.