CN-121977338-A - Shavings drying control device and resistance coefficient calculation method for shavings accumulation area

CN121977338ACN 121977338 ACN121977338 ACN 121977338ACN-121977338-A

Abstract

The application discloses a shaving drying control device and a shaving stacking area resistance coefficient calculating method, and relates to the technical field of shaving drying. The sensor aims to solve the problems of single sensor, lower regulation and control precision and higher reproduction difficulty in the prior art. The device comprises a longitudinal cabinet body, a transverse cabinet body and an arc-shaped connecting cabinet body used for communicating the longitudinal cabinet body and the transverse cabinet body, wherein the longitudinal cabinet body is sequentially provided with an air inlet, a first heating zone, a first measuring zone, a second heating zone, a spraying zone, a second measuring zone, a wood shaving stacking zone and a third measuring zone along the airflow flowing direction from top to bottom, the first heating zone, the second heating zone, the built-in heating elements and an adjusting assembly are arranged in the spraying zone, the spraying device and the adjusting assembly are arranged in the spraying zone, the first measuring zone, the second measuring zone, the third measuring zone and the wood shaving stacking zone are respectively provided with a detecting assembly, and a fan is detachably arranged inside or outside the cabinet body and used for realizing the suction or replacement of air in the cabinet body.

Inventors

XU DELIANG
WENG JINPING
ZHANG SHU
SHI LEI
MEI CHANGTONG
ZHOU XIAOYAN

Assignees

南京林业大学

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (10)

1. The wood shavings drying control device is characterized by comprising a cabinet body and a fan; the cabinet body is sequentially provided with an air inlet, a first heating area, a first measuring area, a second heating area, a spraying area, a second measuring area, a wood shaving stacking area and a third measuring area along the gas flowing direction; The first heating zone is internally provided with a first heating element and a first adjusting component, and the first adjusting component is electrically connected with the first heating element and is used for adjusting the heating power of the first heating element; the second heating zone is internally provided with a second heating element and a second adjusting component, and the second adjusting component is electrically connected with the second heating element and is used for adjusting the heating power of the second heating element; the spraying area is internally provided with a spraying device and a third adjusting component, and the third adjusting component is electrically connected with the spraying device and is used for adjusting the spraying power of the spraying device; the first measuring area, the second measuring area and the third measuring area are respectively internally provided with a first detecting component, a second detecting component and a third detecting component, and the first detecting component, the second detecting component and the third detecting component are respectively used for detecting the air speed, the temperature and the relative humidity parameters of the first measuring area, the second measuring area and the third measuring area; The wood shaving stacking area is provided with a screen and a differential pressure sensor, wherein the screen is used for stacking wood shavings which need to be dried; The fan is detachably arranged inside or outside the cabinet body and used for achieving suction or replacement of gas in the cabinet body.
2. The wood shavings drying control device according to claim 1, wherein the first detection component, the second detection component and the third detection component are all integrated temperature, humidity and wind speed sensors, and measuring heads of the integrated temperature, humidity and wind speed sensors are respectively arranged at the central positions of the first measurement area, the second measurement area and the third measurement area; The differential pressure sensor is 5mm away from the upper end surface and the lower end surface of the shaving accumulation area, an upper pressure sensing port and a lower pressure sensing port are respectively arranged, the upper pressure sensing port is in sealing connection with the positive pressure port of the differential pressure sensor, and the lower pressure sensing port is in sealing connection with the negative pressure port of the differential pressure sensor.
3. A wood shavings drying control according to claim 1, wherein the apertures of the screen are adapted to the size of the wood shavings to allow gas to pass while preventing the wood shavings from falling.
4. A wood flake drying control device according to claim 1, further comprising a display panel in signal communication with the first, second, third and differential pressure sensors for receiving and displaying the sensed data of the first, second, third and differential pressure sensors in a cyclic manner.
5. The drying control device for shavings as claimed in claim 1, wherein said first adjusting means adjusts the heating power of said first heating zone according to the room temperature, and the lower said room temperature, the larger the heating power of said first heating zone, and said second adjusting means adjusts the heating power of said second heating zone according to the temperature difference between the temperature data of the first measuring zone and the temperature data required for drying shavings, and the larger said temperature difference, the larger the heating power of said second heating zone.
6. A wood shavings drying control according to claim 1, characterised in that the third adjustment assembly adjusts the spray power of the spray device in dependence of a humidity difference between a desired humidity value and a humidity value measured by the first sensor, the larger the humidity difference the larger the spray power and the smaller the humidity difference the smaller the spray power.
7. The wood shavings drying control device of claim 1, wherein the cabinet comprises a longitudinal cabinet and a transverse cabinet, wherein the longitudinal cabinet and the transverse cabinet are connected by an arc structure, and the vortex and resistance caused by airflow at the corner are avoided.
8. A shavings drying arrangement according to claim 1, characterised in that the outer wall of the shavings accumulation zone is provided with a perspective side opening, which is in sealing engagement with the cabinet when closed and which is adapted to take and place shavings to be dried or shavings after drying when opened.
9. A method of calculating a drag coefficient of a shaving accumulation area using the apparatus as claimed in any one of claims 1 to 8, comprising: acquiring a pressure drop delta P of air flowing through the shaving accumulation area through the differential pressure sensor; averaging the detected air speed through a second detection component and a third detection component to obtain a flow velocity v; Based on the pressure drop deltap and the flow velocity v, the inertial resistance coefficient C 2 and the viscous resistance coefficient D of the shaving accumulation region are calculated by combining a two-term resistance model of the fluid passing through the porous medium.
10. The method of calculating a drag coefficient of a shaving accumulation region according to claim 9, wherein the method of obtaining an inertial drag coefficient C 2 and a viscous drag coefficient D of the shaving accumulation region includes: approximating the shaving accumulation area to a one-dimensional flowing porous medium, approximating the flow of dry hot air in the shaving accumulation area to the flow of air in the porous medium; Introducing a momentum source term based on a momentum equation, and expressing the momentum source term of the porous medium as a combination of a viscous drag term and an inertial drag term, wherein the expression of the momentum equation is shown as a formula (1): (1), In the formula, Indicating the mass density of the fluid, A vector representing the fluid velocity v, t representing time, A time rate of change representing the momentum of the fluid per unit volume; The gradient operator is represented by a gradient operator, The pressure gradient is indicated and the pressure gradient is indicated, Representing a fluid viscosity stress tensor; Su represents a momentum source term; the expression of the momentum source item Su is shown in the formula (2): (2) , Wherein D represents a viscous drag coefficient, mu represents hydrodynamic viscosity, C 2 represents an inertial drag coefficient; momentum source item Su and pressure gradient The expression of the relation of (2) is shown in the formula (3): (3), In the formula, A thickness of the stacked layer of wood shavings; The pressure drop Δp corresponding to the resistance of air passing through the shaving accumulation area is obtained based on expression (3) as follows: (4), In the formula, Representing the absolute value of the flow velocity v; The expression fitting the flow velocity v to the pressure drop Δp is as follows: (5), Wherein a and b are the fitted coefficients respectively; combining expression (4) with expression (5) gives: (6), The inertial resistance coefficient C 2 and the viscous resistance coefficient D are calculated by expression (6).

Description

Shavings drying control device and resistance coefficient calculation method for shavings accumulation area Technical Field The application relates to the technical field of wood shaving drying, in particular to a wood shaving drying control device and a resistance coefficient calculation method for a wood shaving stacking area. Background The oriented strand board is a multi-layer structure board formed by gluing, oriented paving and hot pressing wood large wood shavings with preset shapes and thicknesses. In the process of producing shaving board, drying the shavings is a very important procedure. In the conventional production process, wood shavings are generally dried by adopting a roller drying mode, such as a single-channel or multi-channel roller drying system, and high-temperature smoke at 200-300 ℃ is used as a heat medium. The defects are that: 1. Most of the prior devices only heat through a single element, but do not control and regulate the humidity of the air environment in the drying process, so that the situation of cracking caused by excessive drying in the drying process occurs; 2. most of the prior devices are not provided with real-time detection and monitoring components, and the power adjustment of the heating component or the spraying device only depends on the experience of operators, so that the adjustment precision and the repeatability are poor; 3. in the prior art, most devices only install a single sensor in a shaving accumulation area, and cannot grasp data such as temperature, relative humidity, wind speed and the like of each stage of the device in real time, so that whether the current shaving drying operation is finished cannot be accurately judged; 4. Most of the prior devices adopt right-angle structures, and the operation efficiency is reduced due to air flow blocking during the drying operation. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Disclosure of Invention The application aims to provide a shaving drying control device and a shaving accumulation area resistance coefficient calculation method, which are used for accurately drying shavings of different materials and obtaining the shaving accumulation area resistance coefficient by accurately measuring and regulating and controlling the drying air speed, the temperature and the relative humidity. In order to achieve the above purpose, the application is realized by adopting the following technical scheme: In a first aspect, the present application provides a wood shavings drying control device, the device comprising a cabinet and a fan; the cabinet body is sequentially provided with an air inlet, a first heating area, a first measuring area, a second heating area, a spraying area, a second measuring area, a wood shaving stacking area and a third measuring area along the gas flowing direction; The first heating zone is internally provided with a first heating element and a first adjusting component, and the first adjusting component is electrically connected with the first heating element and is used for adjusting the heating power of the first heating element; the second heating zone is internally provided with a second heating element and a second adjusting component, and the second adjusting component is electrically connected with the second heating element and is used for adjusting the heating power of the second heating element; the spraying area is internally provided with a spraying device and a third adjusting component, and the third adjusting component is electrically connected with the spraying device and is used for adjusting the spraying power of the spraying device; the first measuring area, the second measuring area and the third measuring area are respectively internally provided with a first detecting component, a second detecting component and a third detecting component, and the first detecting component, the second detecting component and the third detecting component are respectively used for detecting the air speed, the temperature and the relative humidity parameters of the first measuring area, the second measuring area and the third measuring area; The wood shaving stacking area is provided with a screen and a differential pressure sensor, wherein the screen is used for stacking wood shavings which need to be dried; The fan is detachably arranged inside or outside the cabinet body and used for achieving suction or replacement of gas in the cabinet body. Further, the first detection assembly, the second detection assembly and the third detection assembly are integrated temperature, humidity and wind speed sensors, and measuring heads of the integrated temperature, humidity and wind speed sensors are respectively arranged at the centr