Wood shaving drying control device and wood shaving accumulation area resistance coefficient calculation method
By using a multi-zone measurement and adjustment drying control device and a resistance coefficient calculation method, the problems of air humidity control, heating component adjustment accuracy, and airflow obstruction during the wood shavings drying process were solved, achieving precise drying and improved efficiency.
Patent Information
- Application Number
- CN202610157629.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-04
- Publication Date
- 2026-05-05
AI Technical Summary
Existing wood shavings drying equipment has shortcomings in areas such as air humidity control and regulation, heating component adjustment accuracy and real-time monitoring, and airflow obstruction, leading to problems such as cracking and low efficiency during the drying process.
The drying control device employs a multi-zone measurement and adjustment system, including a heating zone, a spray zone, and a measurement zone. Combined with integrated temperature, humidity, wind speed sensors and differential pressure sensors, it achieves precise measurement and control of the dry air. Furthermore, it optimizes airflow through an arc-shaped structure and calculates the resistance coefficient of the wood shavings accumulation zone.
It enables precise control of the wood shavings drying process, avoids cracking, improves work efficiency, and provides a method for calculating the resistance coefficient to optimize drying effect and energy utilization.
Smart Images
Figure CN121977338A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wood shavings drying technology, and in particular to a wood shavings drying control device and a method for calculating the resistance coefficient of the wood shavings accumulation zone. Background Technology
[0002] Oriented strand board (OSB) is a multi-layered structural board made from wood shavings of a predetermined shape and thickness through gluing, oriented laying, and hot pressing. Shaving drying is a crucial step in the OSB production process. Traditionally, shavings are dried using drum drying methods, such as single-channel or multi-channel roller drying systems, with high-temperature flue gas at 200-300℃ as the heat medium.
[0003] Its shortcomings are: 1. Most existing devices only use a single heating element and do not control and regulate the humidity of the air environment during the drying process, which can lead to excessive drying and cracking. 2. Most existing devices do not have real-time detection and monitoring components installed. The power adjustment of heating components or spray devices relies solely on the operator's experience, resulting in poor adjustment accuracy and repeatability. 3. Most existing devices only install a single sensor in the wood shavings accumulation area, which cannot monitor the temperature, relative humidity, and wind speed at each stage of the device in real time, thus making it impossible to accurately determine whether the current wood shavings drying operation has ended. 4. Most existing devices use a right-angle structure, which can easily cause airflow obstruction during drying operations, leading to a decrease in operating efficiency.
[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention
[0005] The purpose of this application is to provide a wood shavings drying control device and a method for calculating the resistance coefficient of the wood shavings accumulation zone. By accurately measuring and controlling the drying air velocity, temperature and relative humidity, the device can achieve precise drying of wood shavings of different materials and obtain the resistance coefficient of the wood shavings accumulation zone.
[0006] To achieve the above objectives, this application employs the following technical solution: In a first aspect, this application provides a wood shavings drying control device, the device including a cabinet and a fan; The cabinet is provided with an air inlet, a first heating zone, a first measuring zone, a second heating zone, a spray zone, a second measuring zone, a wood shavings accumulation zone, and a third measuring zone in sequence along the gas flow direction. The first heating zone has a built-in first heating element and a first adjustment component. The first adjustment component is electrically connected to the first heating element and is used to adjust the heating power of the first heating element. The second heating zone has a built-in second heating element and a second adjustment component. The second adjustment component is electrically connected to the second heating element and is used to adjust the heating power of the second heating element. The spray zone has a built-in spray device and a third adjustment component. The third adjustment component is electrically connected to the spray device and is used to adjust the spray power of the spray device. The first measurement area, the second measurement area, and the third measurement area are respectively equipped with a first detection component, a second detection component, and a third detection component. The first detection component, the second detection component, and the third detection component are respectively used to detect the air velocity, temperature, and relative humidity parameters of the first measurement area, the second measurement area, and the third measurement area. The wood shavings accumulation area is equipped with a screen and a differential pressure sensor. The screen is used to accumulate the wood shavings that need to be dried. The differential pressure sensor is used to detect the differential pressure parameters of the wood shavings accumulation layer on the screen. The fan can be detachably installed inside or outside the cabinet to achieve the extraction or replacement of gas inside the cabinet.
[0007] Furthermore, the first detection component, the second detection component, and the third detection component are all integrated temperature, humidity, and wind speed sensors, and the probes of the integrated temperature, humidity, and wind speed sensors are respectively located at the center of the first measurement area, the second measurement area, and the third measurement area; The differential pressure sensor is provided with an upper pressure port and a lower pressure port at 5mm away from the upper and lower surfaces of the wood shavings accumulation area, respectively. The upper pressure port is sealed to the positive pressure port of the differential pressure sensor, and the lower pressure port is sealed to the negative pressure port of the differential pressure sensor.
[0008] Furthermore, the mesh size of the screen is adapted to the size of the wood shavings, which prevents the wood shavings from falling while allowing gas to pass through.
[0009] Furthermore, the device also includes a display panel, which is connected to the first detection component, the second detection component, the third detection component, and the differential pressure sensor, and is used to receive detection data from the differential pressure sensor of the first detection component, the second detection component, and the third detection component and to display the detection data in a cycle.
[0010] Furthermore, the first adjustment component adjusts the heating power of the first heating zone according to the room temperature, and the lower the room temperature, the greater the heating power of the first heating zone; the second adjustment component adjusts the heating power of the second heating zone according to the temperature difference between the temperature data of the first measurement zone and the temperature data required for drying wood shavings, and the greater the temperature difference, the greater the heating power of the second heating zone.
[0011] Furthermore, the third adjustment component adjusts the spraying power of the spraying device based on the humidity difference between the desired humidity value and the humidity value measured by the first sensor. The larger the humidity difference, the larger the spraying power; the smaller the humidity difference, the smaller the spraying power.
[0012] Furthermore, the cabinet includes a longitudinal cabinet and a transverse cabinet, and the longitudinal cabinet and the transverse cabinet are connected by an arc-shaped structure to avoid the formation of vortices and resistance in the airflow at the corner.
[0013] Furthermore, the outer wall of the wood shavings accumulation area is provided with a transparent side door. When the side door is closed, it is sealed to the cabinet. When it is opened, it is used to take out and put in wood shavings to be dried or dried wood shavings.
[0014] On the other hand, this application provides a method for calculating the drag coefficient of the wood shavings accumulation zone using the apparatus described in any one of claims 1 to 8, comprising: The differential pressure sensor is used to obtain the pressure drop Δ of air flowing through the wood shavings accumulation area. P ; The average value of the detected air velocity is taken by the second and third detection components as the flow rate. v ; Based on the pressure drop Δ P and the flow rate v By combining a two-term drag model of fluid passing through a porous medium, the inertial drag coefficient of the wood shavings accumulation zone was calculated. C 2 With viscous drag coefficient D .
[0015] Furthermore, the inertial drag coefficient of the wood shavings accumulation zone is obtained. C 2 With viscous drag coefficient D The methods include: The wood shavings accumulation zone is approximated as a one-dimensional flowing porous medium, and the flow of dry hot air in the wood shavings accumulation zone is approximated as the flow of air in a porous medium. Based on the momentum equation, a momentum source term is introduced, which represents the momentum source term of porous media as a combination of viscous drag term and inertial drag term. The expression of the momentum equation is shown in equation (1): (1), In the formula, Indicates the mass density of the fluid. Indicates fluid velocity v vector, t Indicates time, Represents the rate of change of momentum of a unit volume of fluid over time; Represents the gradient operator. Indicates the pressure gradient. Represents the fluid viscous stress tensor; Represents the gravitational acceleration vector; Su Represents the momentum source term; The momentum source term Su The expression for is shown in equation (2): (2), In the formula, D Indicates the viscous drag coefficient; μ Indicates the dynamic viscosity of a fluid; C 2 Indicates the coefficient of inertial drag; Momentum source term Su With pressure gradient The expression for the relationship is shown in equation (3): (3), In the formula, The thickness of the shavings deposit layer; Based on expression (3), the pressure drop Δ corresponding to the resistance of air passing through the wood shavings accumulation area is obtained. P The expression is as follows: (4), In the formula, Indicates flow rate v The absolute value; flow rate v With pressure drop Δ P The fitted expression is as follows: (5), In the formula, a and b These are the coefficients after fitting; Combining expression (4) and expression (5), we get: (6), The inertial drag coefficient is calculated using expression (6). C 2 With viscous drag coefficient D . Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the air parameter measurement and control device for the dried wood shavings accumulation area provided in this application; Figure 2 This is a schematic diagram of the structure of the wood shavings accumulation zone in the air parameter measurement and control device for the wood shavings accumulation zone provided in this application; Figure 3 This is a flowchart of the power regulation process of the air parameter measurement and control device for the dry wood shavings accumulation area provided in this application.
[0017] Explanation of reference numerals in the attached figures: 1-Air inlet; 2-First heating zone; 3-First measuring zone; 4-Second heating zone; 5-Second measuring zone; 6-Spray zone; 7-Shavings accumulation zone; 8-Third measuring zone; 9-Fan; 10-Air outlet; 11-First adjustment component; 12-Second adjustment component; 13-Third adjustment component; 14-Display panel; 15-Metal mesh; 16-Side door. Detailed Implementation The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Example 1
[0018] See Figure 1 This embodiment provides an air parameter measurement and control device for a dry wood shavings accumulation area. The device includes a longitudinal cabinet, a transverse cabinet, and an arc-shaped connecting cabinet for connecting the two. The longitudinal cabinet and the transverse cabinet form a closed airflow channel through the arc-shaped connecting cabinet.
[0019] The vertical cabinet is arranged along the airflow direction from top to bottom, with an air inlet, a first heating zone, a first measuring zone, a second heating zone, a spray zone, a shavings accumulation zone, and a third measuring zone. The first and second heating zones are independent heating structures. The overall frame is a rectangular frame made of aluminum alloy, with multiple PTC ceramic heating elements arranged in parallel inside the frame. High-temperature resistant ceramic insulating end plates are located at both ends of the frame, integrating electrical connectors. The first heating zone contains a first heating element and a first adjustment component. The first adjustment component is electrically connected to the first heating element and is used to adjust the heating power of the first heating element. The second heating zone contains a second heating element and a second adjustment component. The second adjustment component is electrically connected to the second heating element and is used to adjust the heating power of the second heating element. In this embodiment, an electric heater is preferred as the heating device.
[0020] The spray area has a built-in spray device, which includes atomizing spray heads, a delivery pump, a solenoid valve, and delivery pipes. To facilitate timely and convenient water replenishment, a storage tank is added outside the device. The atomizing spray heads are detachably and securely installed above the spray area. The outlet of the storage tank is sealed and connected to the inlet of the delivery pump via a delivery pipe through a sealed opening in the spray area. The outlet of the delivery pump is connected to the inlet of the solenoid valve via a delivery pipe. The outlet of the solenoid valve is connected to the atomizing spray heads via a delivery pipe. This embodiment preferably uses a steam spray humidifier as the spray device.
[0021] The horizontal cabinet has a built-in fan, and an air outlet is set at the end of the horizontal cabinet away from the vertical cabinet. The fan exhausts the air in the device through the air outlet.
[0022] The device also includes an adjustment component for adjusting the operating parameters of each actuator, and a detection component for detecting air parameters and providing a basis for adjustment.
[0023] The detection assembly includes three integrated sensors and one differential pressure sensor. The first, second, and third measurement zones each have their own detection assembly at their center, used to monitor the air temperature, humidity, and airflow velocity in their respective zones in real time. The first, second, and third detection assemblies are integrated sensors, employing a hot-wire anemometer to detect airflow velocity, a thermocouple thermometer to detect air temperature, and a dew point thermometer to measure relative humidity. These three different sensors are integrated into a single unit. The differential pressure sensor is positioned above and below the wood shavings accumulation zone to measure the pressure drop between the upper and lower layers of the wood shavings on the screen. An upper pressure port and a lower pressure port are respectively located 5mm from the upper and lower surfaces of the wood shavings accumulation zone. The upper pressure port is sealed to the positive pressure port of the differential pressure sensor, and the lower pressure port is sealed to the negative pressure port of the differential pressure sensor.
[0024] The adjustment assembly includes a first adjustment component, a second adjustment component, and a third adjustment component. The first and second adjustment components are rotary power adjustment components. The first adjustment component is located on the outer wall of the first heating zone and is electrically connected to the electrical connector of the first heating zone. The second adjustment component is electrically connected to the electrical connector of the second heating zone. The electrical connector receives power adjustment signals from the adjustment components. The rotary power adjustment component has a power scale, which allows the power to be adjusted from small to large in a clockwise direction, facilitating intuitive reading of operating parameters by the operator.
[0025] The third adjustment component is a knob-type proportional adjustment component. The third adjustment component is electrically connected to the solenoid valve in the spray device. In this embodiment, the knob-type proportional adjustment component is also set to a proportional size from small to large in a clockwise direction to control the opening of the solenoid valve, thereby controlling the spraying ratio of the atomizing spray head. Example 2
[0026] See Figure 1 In this embodiment, a display panel is provided based on the first embodiment. The display panel is electrically connected to the first sensor, the second sensor, the third sensor and the differential pressure sensor respectively. It receives the air temperature, real-time humidity, airflow speed and pressure drop values above and below the wood shavings accumulation area in the measurement area of these sensors in real time, and displays these detection data in real time on the display panel, so that the operator can make adjustments according to the values on the display panel.
[0027] See Figure 2 To monitor the drying status of the wood shavings accumulation area in real time and facilitate the handling of wood shavings, this embodiment features a side-opening door on the side wall of the longitudinal cabinet corresponding to the wood shavings accumulation area. The door panel is made of high-strength tempered glass, which has high transparency and high temperature resistance. Since this embodiment uses a spray system to maintain the relative humidity of the wood shavings, and because it uses two heating zones to change the drying temperature, a temperature difference between the device and the external environment is likely to occur. Therefore, to prevent fogging, an anti-fogging coating is sprayed on the inner wall of the side-opening door. A 2mm thick metal screen is detachably fixed to the bottom of the wood shavings accumulation area with bolts. This metal screen supports the wood shavings accumulation area. Furthermore, to prevent uneven airflow during drying, which could lead to uneven drying, this metal screen has a 5mm*5mm pore size.
[0028] During artificial drying, the fan generates negative pressure suction, creating a pressure difference within the closed airflow channel. The air inlet at the top of the device serves as the sole channel for external air to enter, guiding the air to flow in smoothly under negative pressure. After entering the device, the air first passes through the first heating zone. The first adjustment component adjusts the power of the electric heating element in the first heating zone according to the current room temperature to initially heat the air. The lower the current room temperature, the higher the power value on the first adjustment component is rotated, and the higher the power of the electric heating element. Conversely, the higher the room temperature, the lower the power value on the second adjustment component is rotated, and the lower the power of the electric heating element. The initially heated air then enters the first measurement zone. The first sensor uses a hot-wire anemometer to detect the airflow velocity, a thermocouple thermometer to detect the air temperature, and a dew point thermometer to measure the relative humidity. The detected airflow velocity, temperature, and relative humidity data after the first heating are transmitted to the display panel in real time. The operator can visually read these parameters on the display panel to make preliminary judgments and use them as a basis for decision-making. Next, air enters the second heating zone. The second adjustment component adjusts based on the temperature of the first heating zone and the required dry air temperature. The greater the temperature difference between the first heating zone and the required dry air temperature, the higher the power value on the first adjustment component is rotated, and the higher the power of the electric heating element. Conversely, the closer the temperature of the first heating zone is to the required dry air temperature, the lower the power value on the first adjustment component is rotated, and the lower the power of the electric heating element. The air, after being heated a second time, enters the spray zone. The operator judges the relative humidity of the second heating zone based on the display panel. The greater the difference between the relative humidity of the second heating zone and the required air humidity, the higher the ratio of the third adjustment component is rotated, controlling the opening of the solenoid valve to be higher, thereby controlling the spray ratio of the atomizing spray head to be higher.
[0029] Air passing through the spray zone reaches the second measurement zone, where the flow rate, temperature, and relative humidity data of the air after the second heating are transmitted to the display panel in real time. After passing through the second measurement zone, the air enters the wood shavings accumulation zone. Pressure sensors are installed at both the top and bottom of the accumulation zone. The upper sensor records the air pressure before entering the accumulation zone, and the lower sensor records the air pressure after entering the accumulation zone for drying. Air enters from above the accumulation zone, drying the wood shavings on the metal screen, and flows out through the gaps in the screen. A differential pressure sensor in the accumulation zone measures the pressure drop across the area and transmits this data to the display panel. After drying, the air continues to descend into the third measurement zone, where the flow rate, temperature, and relative humidity data are transmitted to the display panel in real time. Finally, the air is discharged from the air outlet by a fan.
[0030] Operators can observe the drying process of the wood shavings accumulation layer in real time through the transparent door panel. After drying is completed, the wood shavings in the accumulation area can be removed by opening the door panel and new wood shavings that need to be dried can be placed in. Example 3
[0031] See Figure 3 This embodiment provides an automatic adjustment method. The device provided in this embodiment includes a control module installed near the display panel. The control module is signal-connected to the second adjustment component. Temperature data from the first and second measurement areas are transmitted to the control module via a signal transmission link. The second measurement area transmits the air temperature after passing through the second heating area to the control module. The control module analyzes whether there is a difference between the real-time temperature of the second measurement area and the desired dry air temperature. If there is no difference, meaning the real-time temperature of the second measurement area reaches the desired drying temperature during operation, no adjustment of the power of the second adjustment component is required. If a difference exists, the control module incorporates this difference as a feedback signal. Simultaneously, the temperature of the first measurement area is sent to the control module as a feedforward signal. The control module performs a comprehensive analysis based on the feedback signal and the feedforward signal to generate corresponding adjustment signal parameters, instructing the second adjustment component to adjust its output power, thus achieving automatic adjustment. Example 4
[0032] This embodiment proposes a method for calculating the resistance coefficient of the wood shavings accumulation zone using any of the devices described in Embodiments 1 to 3. By measuring and calculating the temperature, velocity, relative humidity, and differential pressure of the flow field in the wood shavings drying space, a reference can be provided for setting the thickness of the wood shavings accumulation zone and adjusting the power settings of the components.
[0033] This embodiment primarily proposes calculating the inertial drag coefficient and viscous drag coefficient of airflow in a wood shavings accumulation zone. These two coefficients describe the magnitude of viscous and inertial drag experienced by the fluid during its motion, respectively. The viscous drag coefficient, also known as the friction drag coefficient, is the ratio of the resistance generated by intermolecular friction to the fluid's dynamic viscosity. This coefficient reflects the magnitude of internal frictional resistance and is related to the fluid's properties and flow state. The inertial drag coefficient, also known as the Reynolds number, is a dimensionless number in fluid motion, representing the ratio of the inertial force to the viscous force of fluid particles. A higher Reynolds number indicates a more pronounced inertial effect and a weaker viscous effect; conversely, a lower Reynolds number indicates a weaker viscous effect. The Reynolds number is an important basis for judging the fluid flow state. Both the viscous drag coefficient and the inertial drag coefficient play a role in calculations related to momentum conservation. When the wind speed reaches a certain value, inertial force plays a dominant role, and the effect of viscous force is often negligible. When the wind speed is low, the pressure drop and the logarithm of the wind speed are almost linearly related, and the effect of viscous force cannot be ignored. At this point, the particle layer is considered as a simple, uniform, porous medium, while the effects of viscous and inertial forces are taken into account, so as to predict the pressure loss of the airflow passing through the particle accumulation area.
[0034] First, the flow of dry hot air in the wood shavings accumulation zone can be approximated as the flow of air in a porous medium. Since the wood shavings are less than 1 mm thick, the entire accumulated wood shavings accumulation zone can be approximated as a one-dimensional flowing porous medium.
[0035] Based on the momentum equation, a momentum source term is introduced, which represents the momentum source term of porous media as a combination of viscous drag term and inertial drag term. The expression of the momentum equation is shown in equation (1): (1), In the formula, Indicates the mass density of the fluid. Indicates fluid velocity v vector, t Indicates time, Represents the rate of change of momentum of a unit volume of fluid over time; Represents the gradient operator. Indicates the pressure gradient. Represents the fluid viscous stress tensor; Represents the gravitational acceleration vector; Su This represents the momentum source term.
[0036] In this embodiment, The density of dry, hot air can be calculated from the detection data in the first, second, and third measurement zones. It changes with the airflow state. The pressure gradient is the driving force that causes air to flow from a high-pressure area to a low-pressure area. This represents the viscous frictional resistance inside dry, hot air.
[0037] Momentum source term Su The expression for is shown in equation (2): (2), In the formula, D Indicates the viscous drag coefficient; μ Indicates the dynamic viscosity of a fluid; C 2 Indicates the coefficient of inertial drag; Momentum source term Su With pressure gradient The expression for the relationship is shown in equation (3): (3), In the formula, The thickness of the wood shavings deposit; Based on expression (3), the pressure drop Δ corresponding to the resistance of air passing through the wood shavings accumulation zone is obtained. P The expression is as follows: (4), In the formula, Indicates flow rate v The absolute value; flow rate v With pressure drop Δ P The fitted expression is as follows: (5), In the formula, a and b These are the coefficients after fitting; Combining expression (4) and expression (5), we get: (6), The inertial drag coefficient is calculated using expression (6). C 2 With viscous drag coefficient D .
[0038] The inertial drag coefficient C2 and the viscous drag coefficient D can be used as fundamental parameters for calculating the flow and heat transfer of dry air in the wood shavings accumulation zone. These two coefficients essentially reflect the combined hindering effect of the pore structure, particle morphology, and packing density of the wood shavings accumulation zone on the flow of dry air. The accuracy of their values directly determines the model's accuracy in predicting flow characteristics such as air infiltration velocity and pressure loss, thus affecting the calculation accuracy of heat conduction and convective heat transfer efficiency during the heat transfer process. In industrial scenarios involving wood shavings accumulation zones, such as wood drying and biomass pyrolysis, accurately obtaining these two fundamental parameters through experimental testing can provide crucial data support for establishing a flow-heat transfer coupling calculation model that fits actual working conditions. This effectively improves the model's ability to predict core indicators such as drying effect and energy loss, providing a reliable theoretical basis for process optimization and equipment design.
[0039] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific orientation. If the specific orientation changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0040] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
[0042] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A wood shavings drying control device, characterized in that, The device includes a cabinet and a fan; The cabinet is provided with an air inlet, a first heating zone, a first measuring zone, a second heating zone, a spray zone, a second measuring zone, a wood shavings accumulation zone, and a third measuring zone in sequence along the gas flow direction. The first heating zone has a built-in first heating element and a first adjustment component. The first adjustment component is electrically connected to the first heating element and is used to adjust the heating power of the first heating element. The second heating zone has a built-in second heating element and a second adjustment component. The second adjustment component is electrically connected to the second heating element and is used to adjust the heating power of the second heating element. The spray zone has a built-in spray device and a third adjustment component. The third adjustment component is electrically connected to the spray device and is used to adjust the spray power of the spray device. The first measurement area, the second measurement area, and the third measurement area are respectively equipped with a first detection component, a second detection component, and a third detection component. The first detection component, the second detection component, and the third detection component are respectively used to detect the air velocity, temperature, and relative humidity parameters of the first measurement area, the second measurement area, and the third measurement area. The wood shavings accumulation area is equipped with a screen and a differential pressure sensor. The screen is used to accumulate the wood shavings that need to be dried. The differential pressure sensor is used to detect the differential pressure parameters of the wood shavings accumulation layer on the screen. The fan can be detachably installed inside or outside the cabinet to achieve the extraction or replacement of gas inside the cabinet.
2. The wood shavings drying control device according to claim 1, characterized in that, The first detection component, the second detection component, and the third detection component are all integrated temperature, humidity, and wind speed sensors, and the probes of the integrated temperature, humidity, and wind speed sensors are respectively set at the center of the first measurement area, the second measurement area, and the third measurement area; The differential pressure sensor is provided with an upper pressure port and a lower pressure port at 5mm away from the upper and lower surfaces of the wood shavings accumulation area, respectively. The upper pressure port is sealed to the positive pressure port of the differential pressure sensor, and the lower pressure port is sealed to the negative pressure port of the differential pressure sensor.
3. The wood shavings drying control device according to claim 1, characterized in that, The mesh size of the screen is adapted to the size of the wood shavings, which prevents the wood shavings from falling while allowing gas to pass through.
4. The wood shavings drying control device according to claim 1, characterized in that, The device further includes a display panel, which is connected to the first detection component, the second detection component, the third detection component, and the differential pressure sensor. The display panel is used to receive detection data from the first detection component, the second detection component, the third detection component, and the differential pressure sensor, and to display the detection data in a cyclic manner.
5. The wood shavings drying control device according to claim 1, characterized in that, The first adjustment component adjusts the heating power of the first heating zone according to the room temperature, and the lower the room temperature, the greater the heating power of the first heating zone; the second adjustment component adjusts the heating power of the second heating zone according to the temperature difference between the temperature data of the first measurement zone and the temperature data required for drying wood shavings, and the greater the temperature difference, the greater the heating power of the second heating zone.
6. The wood shavings drying control device according to claim 1, characterized in that, The third adjustment component adjusts the spray power of the spray device based on the humidity difference between the desired humidity value and the humidity value measured by the first sensor. The larger the humidity difference, the larger the spray power; the smaller the humidity difference, the smaller the spray power.
7. The wood shavings drying control device according to claim 1, characterized in that, The cabinet includes a longitudinal cabinet and a transverse cabinet, and the longitudinal cabinet and the transverse cabinet are connected by an arc-shaped structure to avoid the formation of vortices and resistance in the airflow at the corner.
8. The wood shavings drying apparatus according to claim 1, characterized in that, The outer wall of the wood shavings accumulation area is provided with a transparent side door. When closed, the side door is sealed to the cabinet. When opened, it is used to take out and put in wood shavings to be dried or dried wood shavings.
9. A method for calculating the resistance coefficient of the wood shavings accumulation zone using the apparatus described in any one of claims 1 to 8, characterized in that, include: The differential pressure sensor is used to obtain the pressure drop Δ of air flowing through the wood shavings accumulation area. P ; The average value of the detected air velocity is taken by the second and third detection components as the flow rate. v ; Based on the pressure drop Δ P and the flow rate v By combining a two-term drag model of fluid passing through a porous medium, the inertial drag coefficient of the wood shavings accumulation zone was calculated. C 2 With viscous drag coefficient D .
10. The method for calculating the resistance coefficient of the wood shavings accumulation zone according to claim 9, characterized in that, The inertial drag coefficient of the wood shavings accumulation zone is obtained. C 2 With viscous drag coefficient D The methods include: The wood shavings accumulation zone is approximated as a one-dimensional flowing porous medium, and the flow of dry hot air in the wood shavings accumulation zone is approximated as the flow of air in a porous medium. Based on the momentum equation, a momentum source term is introduced, which represents the momentum source term of porous media as a combination of viscous drag term and inertial drag term. The expression of the momentum equation is shown in equation (1): （1）， In the formula, Indicates the mass density of the fluid. Indicates fluid velocity v vector, t Indicates time, Represents the rate of change of momentum of a unit volume of fluid over time; Represents the gradient operator. Indicates the pressure gradient. Represents the fluid viscous stress tensor; Represents the gravitational acceleration vector; Su Represents the momentum source term; The momentum source term Su The expression for is shown in equation (2): （2） ， In the formula, D Indicates the viscous drag coefficient; μ Indicates the dynamic viscosity of a fluid; C 2 Indicates the coefficient of inertial drag; Momentum source term Su With pressure gradient The expression for the relationship is shown in equation (3): （3）， In the formula, The thickness of the shavings deposit layer; Based on expression (3), the pressure drop Δ corresponding to the resistance of air passing through the wood shavings accumulation area is obtained. P The expression is as follows: （4）， In the formula, Indicates flow rate v The absolute value; flow rate v With pressure drop Δ P The fitted expression is as follows: （5）， In the formula, a and b These are the coefficients after fitting; Combining expression (4) and expression (5), we get: （6）， The inertial drag coefficient is calculated using expression (6). C 2 With viscous drag coefficient D .