A water collecting electrode plate drying and steam preparation system
Through the water-collecting electrode heating technology and intelligent control system, synchronous heating of the wood inside and outside and efficient water vapor recovery are achieved, solving the problems of low efficiency and high energy consumption of existing wood drying methods and improving the efficiency and economy of industrial production.
Patent Information
- Application Number
- CN202310514438.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-09
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2043-05-09
AI Technical Summary
Existing wood drying methods have problems such as low efficiency, high energy consumption, easy damage to wood, and unsuitability for industrial production. In particular, methods such as steam drying, electric heating and vacuum drying have shortcomings in resource utilization and efficiency.
The water-collecting electrode heating technology is adopted, and water is used as the heat carrier. The inside and outside of the plate are heated by water resistance for synchronous drying, generating water vapor and recovering it to the heat storage and heat exchange tank. Combined with the intelligent control system to optimize the current and temperature, efficient water evaporation and heat recovery are achieved.
It improves wood drying efficiency, reduces steam and fuel consumption, lowers manufacturing costs, and occupies a small area, making it suitable for industrial production.
Smart Images
Figure CN116294516B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of plate processing, and in particular relates to a water-collecting electrode plate drying and steam preparation system and a control method. Background Art
[0002] There are many methods for drying wood, including indoor drying. Indoor drying involves drying wood in a conventional drying room with controlled drying medium parameters. Depending on the temperature of the drying medium, indoor drying can be categorized as low-humidity drying, room temperature drying, and high-temperature drying.
[0003] Steam drying is the primary method, sealing the wood in a steam drying chamber and using steam to promote moisture evaporation, drying the wood. The highest degree of drying can achieve a moisture content of only 3%. However, the high-temperature evaporation process makes the wood brittle, loses its toughness, and is easily damaged. This consumes a large amount of steam heat, fuel, and carbon emissions.
[0004] The electric heating wood dryer uses electricity as the heat source, and the electric heating fin radiator uses radiant heat to dry the board from the outside to the inside, and the drying efficiency is low.
[0005] Vacuum drying (negative pressure drying) is the process of drying wood in a closed container under vacuum conditions. The conditions are harsh and the drying capacity is limited, making it unsuitable for industrial production.
[0006] Solar drying uses collectors to absorb solar radiation to heat the air, and then transfers heat through air convection to dry the wood. However, due to the low heat conversion rate, the efficiency is not high.
[0007] Natural drying, also known as air drying, is the primary method of drying wood. It utilizes atmospheric heat to evaporate moisture from the wood, achieving the desired drying effect. Wood is sorted and placed in a well-ventilated area, stacked on a pile with a gap between them to allow air to circulate, removing moisture and gradually drying the wood. Natural drying typically takes several years or months to achieve the desired drying temperature, making it unsuitable for industrial production.
[0008] In order to improve the drying efficiency of the boards, renewable energy is used to generate electricity and water electrode heating technology is adopted to heat the inside and outside of the boards simultaneously to evaporate water vapor, avoiding the inefficient heating method of the boards from the outside to the inside and avoiding the heating method from the inside to the outside that causes a rapid increase in water vapor and causes the boards to explode and crack.
[0009] Therefore, a water-collecting electrode plate drying, steam preparation system and control method are proposed, which is suitable for drying thin plates. Summary of the Invention
[0010] In order to solve the above technical problems, the present invention proposes a water-collecting electrode plate drying, steam preparation system and control method, which fully utilizes the combination of renewable energy and water electrode heating technology, synchronously heats the inside and outside of the plate for drying, converts the moisture in the plate into water vapor and releases it at a certain optimized temperature, and recovers the water vapor into a heat storage and heat exchange tank through an induced draft fan to obtain high-temperature water vapor, which can provide the water vapor needs of other processes, thereby greatly improving efficiency.
[0011] The heat and moisture conduction principle in the board drying process involved in the present invention is:
[0012] First, the wood is preheated by using saturated wet air or nearly saturated wet air as a drying medium. When water condenses on the surface of the wood, the latent heat of vaporization contained in the water vapor becomes sensible heat and acts on the surface of the wood. The temperature is transferred from the surface to the inside, and the temperature of the wood gradually rises to the medium temperature.
[0013] When drying begins, the free water and part of the adsorbed water on the wood surface evaporate under the action of the water vapor partial pressure difference. The free water in the large capillaries on the wood surface evaporates first, and then the water adsorbed in the microcapillaries evaporates. The water enters the drying medium through the water vapor and is then discharged.
[0014] As the moisture on the wood surface evaporates, the moisture content decreases, and there are two gradient changes between the surface and internal layers of the wood: high moisture content inside and low outside, and low temperature inside and high outside. Under the action of this gradient, the moisture in the internal layers moves to the surface until the drying is completed, and the moisture content of the inner and outer layers of the wood is close to the same.
[0015] Among them, the greater the moisture content gradient, the faster the movement speed. The moisture content gradient is the driving force of water movement, and the direction of water movement is from high moisture content to low moisture content.
[0016] The difficulty of moisture movement caused by the moisture content gradient is related to the structural characteristics and physical properties of the board. It is easier for lower density wood than higher density wood; easier for sapwood than heartwood; easier along the grain than across the grain; and easier radially than tangentially.
[0017] Temperature gradients are another driving force for moisture migration. As moisture from the wood's interior moves toward the surface, it evaporates into the air as water vapor. The evaporation rate varies with the drying medium's temperature, humidity, and circulation rate. The evaporation rate of wood moisture increases with increasing medium temperature. However, a higher medium temperature is not always better; the appropriate temperature depends on the drying characteristics of the wood. Before drying, preheating the wood with a high-temperature, high-humidity medium raises the internal temperature before drying, aligning the temperature gradient with the moisture content gradient to increase drying speed.
[0018] Therefore, before drying, the wood should be cut into the required size to increase the moisture drainage area. During drying, the boards should be stacked in a vertical interval to ensure that the medium circulates at a certain flow rate for exchange, transferring heat from the medium to the boards, thereby accelerating the movement of water molecules in the boards and promoting their removal. The speed of air circulation directly affects the speed of evaporation. However, if the air flow speed is too fast, the energy consumption will be greater, and the boards and the drying medium will not be able to exchange heat and moisture well, which will not improve the drying speed. The general air flow speed is 1-3 meters per second.
[0019] The basic principles of drying and steam generation of the water collecting electrode plate involved in the present invention are:
[0020] Using water as a heating medium—water acts as a heating resistor, commonly known as a "water resistor." Electrodes apply an AC electric field to the water. Utilizing the principle of ion oscillation, water ions vibrate violently at the speed of light within the closed electric field, colliding and frictionally generating heat. This converts the electric field energy directly into thermal energy. Water acts as both a heat generator and a heat sink, eliminating losses caused by heat radiation and heat conduction, maintaining power attenuation, and achieving high thermal efficiency. Based on the principle of water resistor electrode heating, different voltage levels are applied to panels containing varying moisture levels. Current flows through the water resistor within the panels, heating them. At a specific optimized temperature, the moisture in the panels is converted into water vapor, which is then released. This water vapor is then recovered via an induced draft fan into a heat storage and heat exchange tank, generating high-temperature steam to meet the water vapor needs of other processes.
[0021] The basic board processing process includes raw materials, wood particle preparation, drying, sorting, glue mixing, paving, pre-pressing, hot pressing, post-processing, inspection, and storage. Furthermore, fire prevention is a key consideration. Since the temperature rise of water resistance is related to current flow, with higher current leading to higher temperature rise, the drying process requires converting water into steam, with temperatures exceeding 100°C. By real-time monitoring of current flowing through the board, steam temperature, and other relevant data, the controller optimizes the output power of the linear intelligent controllable AC power supply, taking into account process requirements, efficiency, and economic considerations. Furthermore, an independent safety system for fire protection, heat preservation, steam tank pressure, and leakage protection is established.
[0022] In order to achieve the above object, the present invention adopts the following technical solutions:
[0023] A water-collecting electrode plate drying and steam preparation system comprises an electrode plate drying unit, a gas collecting hood, a power supply and heating system, a conveying platform, and a heat storage and heat exchange system; wherein the conveying platform is placed in a plate processing room, and the electrode plate drying unit is placed on the conveying platform and placed in the gas collecting hood; the gas collecting hood is provided with hot and cold air inlet and exhaust ports, which are respectively connected to the heat storage and heat exchange system and the cold air pipe in a time-sharing manner; the power supply and heating system is placed in a power distribution room, and on-site equipment information is collected and controlled through wired or wireless transmission, and the power supply of the electrode plate drying unit is connected to the telescopic heating electrode group of the gas collecting hood through a cable; the heat storage and heat exchange system is placed around the plate processing room and is respectively connected to the gas collecting hood and other process gas pipes through pipes.
[0024] Furthermore, the conveying platform includes a first insulating rail, a second insulating rail, a platform bottom plate, a sliding trolley, and a heat recovery pipe; wherein the sliding trolley is composed of an insulating pallet and four tray wheels, carrying the electrode plate drying unit and the gas collecting hood, and a plurality of exhaust holes are evenly arranged on the insulating pallet; the first insulating rail and the second insulating rail are installed in parallel on the platform bottom plate, and the sliding trolley is placed on the platform bottom plate and can move to complete the feeding, drying, and cooling processes respectively;
[0025] The air inlet and outlet on the platform bottom plate are respectively connected to the two ends of the heat recovery pipe under the platform bottom plate, so as to recover the heat of the plate cooling process to the plate drying process, increase the basic heat of the plate drying process, and effectively utilize the waste heat.
[0026] Furthermore, the electrode plate drying unit includes a first-layer electrode plate drying module, a second-layer electrode plate drying module, an n-th-layer electrode plate drying module, a first through-plate connecting rod, a second through-plate connecting rod, a third through-plate connecting rod, and a fourth through-plate connecting rod;
[0027] The first, second, third, and fourth plate-penetrating connecting rods all include a clamping cam, which is equipped with a cam eccentric and a clamping pressure wrench hole. Each plate-penetrating connecting rod is a nail-shaped structure with a first hole near the nail tip. The cam eccentric shaft passes through the first hole. The clamping cam, with the cam eccentric shaft as its center, clamps the plate in conjunction with the clamping pressure wrench hole.
[0028] Each layer of electrode plate drying module consists of a first plate fixture electrode, a second plate fixture electrode and a pre-dried plate; the first plate fixture electrode and the second plate fixture electrode are provided with a second hole and a third hole at both ends, and the first through-plate connecting rod and the second through-plate connecting rod pass through them, and the first plate fixture electrode and the second plate fixture electrode have good electrical conductivity; the first plate fixture electrode and the second plate fixture electrode are placed at equal distances according to the process length of the pre-dried plate, and a pre-dried plate is placed on top to form each layer of electrode plate drying module, and the plate fixture electrodes are operated in sequence to form the first layer of electrode plate drying module. group, the second layer of electrode plate drying module, the nth layer of electrode plate drying module; stack the first layer of electrode plate drying module, the second layer of electrode plate drying module, and the nth layer of electrode plate drying module together, and connect the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module together through the first through-plate connecting rod, the second through-plate connecting rod, the third through-plate connecting rod, and the fourth through-plate connecting rod, and clamp the plates in the first layer of electrode plate drying module, the second layer of electrode plate drying module, and the nth layer of electrode plate drying module through the pressing cam to form an electrode plate drying unit, and leave a gap between each layer of electrode plate drying modules to facilitate the discharge of water vapor; place the electrode plate drying unit on a sliding trolley and place it in a gas collecting hood, and connect the first plate clamp electrode and the second plate clamp electrode of the electrode plate drying unit to the power supply and heating system;
[0029] When a certain voltage is applied between the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module, current will flow through the corresponding plate, and the heat generated under the action of water resistance will be converted into water vapor and discharged. Since a certain gap is left between the first layer of electrode plate drying module, the second layer of electrode plate drying module, and the nth layer of electrode plate drying module, it is conducive to air flow to exchange heat, thereby promoting dehumidification and heat dissipation of the pre-dried plate.
[0030] Furthermore, the gas gathering hood includes a gas gathering hood body, a telescopic heating electrode group, and hot and cold inlet and outlet ports;
[0031] Among them, the gas collection hood is placed on a sliding trolley, the bottom of the gas collection hood is open, and hot and cold inlet and exhaust ports are installed on the outside of the gas collection hood, which are connected to the heat storage and heat exchange system and the cold air pipeline in a time-sharing manner. During the drying process, the hot and cold inlet and exhaust ports are connected to the heat storage and heat exchange system to store the water vapor generated when the wood is dried in the compressed gas storage; during the heat dissipation process, the hot and cold inlet and exhaust ports are connected to the cold air pipeline, and the process harmful dry gas or gas low-temperature dry gas connected to the other end of the cold pipeline is filtered through the gas collection hood, the first layer electrode plate drying module, the second layer electrode plate drying module, and the nth layer electrode plate drying module, and the heat recovery pipeline of the transmission platform recovers the heat and transports it to the plate drying and gasification process;
[0032] The telescopic heating electrode group is installed on the gas collecting cover and consists of a first telescopic heating electrode and a second telescopic heating electrode. The first telescopic heating electrode and the second telescopic heating electrode both include an electrode contact plate, a terminal and a spring.
[0033] Each electrode contact plate is equipped with a terminal and a spring. The first telescopic heating electrode and the second telescopic heating electrode can move up and down under the action of the spring. The terminal is connected to the power supply and heating system.
[0034] During the plate drying and gasification process, the first telescopic heating electrode and the second telescopic heating electrode are pressed against the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module under the action of the spring, providing heating current for the pre-dried plate; during the plate heat dissipation process, the first telescopic heating electrode and the second telescopic heating electrode are lifted and separated from the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module.
[0035] Furthermore, the heat storage and heat exchange system includes a heat storage and heat exchange tank, an induced draft fan, an electrically controlled three-way valve, a temperature regulator, a water steam pipeline, and other process gas pipelines;
[0036] One end of the induced draft fan is connected to the hot and cold inlet and exhaust ports of the hood through a water vapor pipe, and the other end is connected to the heat storage and heat exchange tank through a pipe and an electrically controlled three-way valve. The electrically controlled three-way valve includes three interfaces and one solenoid valve. Two interfaces of the electrically controlled three-way valve are connected in series between the induced draft fan and the heat storage and heat exchange tank, and the other interface is connected to the atmosphere or fire extinguishing gas.
[0037] When the electromagnetic valve is not working, the induced draft fan is connected to the heat storage and heat exchange tank, and the water vapor generated during the plate drying process is discharged into the heat storage and heat exchange tank by the induced draft fan. Adjusting the wind speed of the induced draft fan can change the air flow rate during the plate drying process, which can dynamically adjust the plate drying efficiency and quality;
[0038] During the drying process of the boards, the controller monitors the temperature inside the hood. When the upper temperature limit is reached or a fire alarm is triggered, the electromagnetic valve operates to connect the induced draft fan to the ambient atmosphere or fire extinguishing gas. The controller controls the induced draft fan to change the wind direction and increase the wind speed, so that the ambient atmosphere acts on the drying boards to quickly cool them down or reduce the oxygen content, thereby achieving the effect of extinguishing the fire.
[0039] The heat storage and heat exchange tank is also connected to one end of the temperature regulator through a pipeline, and the other end of the temperature regulator is connected to other process gas pipelines through a pipeline; the gas in the heat storage and heat exchange tank is heated or cooled by the temperature regulator to meet the gas needs of other processes.
[0040] Furthermore, the power supply and heating system includes a controller, an intelligent power supply, a sensor and a control switch; wherein the controller is embedded in the intelligent power supply; the sensor and the control execution device are installed on the corresponding device and connected to the controller through wireless or wired communication. The controller monitors the working status of all devices in real time, and gives corresponding control strategies through models and algorithms, and realizes process control through corresponding control execution devices; the output cable of the intelligent power supply is respectively connected to the terminal blocks on the first telescopic heating electrode and the second telescopic heating electrode, serving as the power supply of the electrode plate drying unit; the output power of the intelligent power supply is output according to the plate drying target model, which includes the moisture content of the wood, the length, width and height of the plate, the type of plate, the optimal process temperature, efficiency and ambient temperature. Beneficial effects
[0041] ① Due to the large exhaust area of the board and the simultaneous heating inside and outside, it is conducive to the rapid discharge of moisture and at the same time reduces or lowers the preheating process of the wood.
[0042] ② Water vapor is generated while the boards are drying, which reduces the use of steam boilers, reduces fuel and heat loss, and saves water. The high-temperature and high-pressure water vapor generated provides energy for other processes, greatly reducing the cost of board manufacturing.
[0043] ③Small size and small footprint. BRIEF DESCRIPTION OF THE DRAWINGS
[0044] Figure 1 This is a schematic structural diagram of a water-collecting electrode plate drying and steam generation system according to the present invention;
[0045] Figure 2 This is a structural schematic diagram of the electrode plate drying unit of the present invention;
[0046] Figure 3 This is a schematic diagram of the structure of a single-layer electrode plate drying module;
[0047] Figure 4 A schematic diagram of a telescopic heating electrode structure.
[0048] Wherein: first layer electrode plate drying module 1, second layer electrode plate drying module 2, nth layer electrode plate drying module 3, first through-plate connecting rod 4, second through-plate connecting rod 5, third through-plate connecting rod 6, fourth through-plate connecting rod 7, pressing cam 8, cam eccentric shaft 9, pressing pressure wrench hole 10, first hole 11, plate 12, first plate fixture electrode 13, second plate fixture electrode 14, second hole 15, third hole, terminal 16, spring 17, electrode contact plate 18, terminal 19, gas collecting cover 20, electrode plate drying Unit 21, gas collection hood 22, conveying platform 23, hot and cold air inlet and exhaust ports 24, cold air duct 25, first telescopic heating electrode 26, second telescopic heating electrode 27, process gas duct 28, first insulating rail 29, second insulating rail 30, platform base plate 31, sliding trolley 32, heat recovery duct 33, tray wheels 35, electric-controlled three-way valve 36, insulating tray 37, air inlet 38, air outlet 39, heat storage and heat exchange tank 40, induced draft fan 41, temperature regulator 42, water vapor pipe 43, controller 44, intelligent power supply 45, cable 46. DETAILED DESCRIPTION
[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
[0050] like Figure 1 As shown, a water-collecting electrode plate drying and steam preparation system of the present invention includes an electrode plate drying unit 21, a gas collecting hood 22, a power supply and heating system, a conveying platform 23, and a heat storage and heat exchange system; wherein, the conveying platform 23 is placed in the plate processing room, and the electrode plate drying unit 21 is placed on the conveying platform 23 and placed in the gas collecting hood 22; there are hot and cold air inlet and exhaust ports 24 on the gas collecting hood 22, which are respectively connected to the heat storage and heat exchange system and the cold air pipe 25 in a time-sharing manner; the power supply and heating system is placed in the power distribution room, and the on-site equipment information collection and control are carried out through wired or wireless transmission, and the power supply of the electrode plate drying unit 21 is connected to the telescopic heating electrode group of the gas collecting hood through a cable 46; the heat storage and heat exchange system is placed around the plate processing room, and is respectively connected to the gas collecting hood 22 and other process gas pipes 28 through pipes.
[0051] The conveying platform 23 includes a first insulating rail 29, a second insulating rail 30, a platform base plate 31, a sliding trolley 32, and a heat recovery pipe 33; wherein, the sliding trolley 32 is composed of an insulating pallet 37 and 4 tray wheels 35, carrying the electrode plate drying unit 21 and the gas collecting hood 22, and a number of exhaust holes are evenly arranged on the insulating pallet 37; the first insulating rail 29 and the second insulating rail 30 are installed in parallel on the platform base plate 31, and the sliding trolley 32 is placed on the platform base plate 31 and can move to complete the feeding, drying, cooling and other processes respectively.
[0052] The air inlet 38 and the air outlet 39 on the platform bottom plate 31 are respectively connected to the two ends of the heat recovery pipe 33 under the platform bottom plate 31, so as to recover the heat of the plate cooling process to the plate drying process, increase the basic heat of the plate drying process, and effectively utilize the waste heat.
[0053] like Figure 2 , Figure 3 As shown, the electrode plate drying unit 21 includes a first-layer electrode plate drying module 1, a second-layer electrode plate drying module 2, an n-th-layer electrode plate drying module 3, a first through-plate connecting rod 4, a second through-plate connecting rod 5, a third through-plate connecting rod 6, and a fourth through-plate connecting rod 7;
[0054] Each plate-penetrating connecting rod includes a clamping cam 8. Mounted on the clamping cam 8 is a cam eccentric shaft 9 and a clamping pressure wrench hole 10. Each plate-penetrating connecting rod is a nail-shaped structure with a first hole 11 near the nail tip. The cam eccentric shaft 9 passes through the first hole 11. The clamping cam 8, with the cam eccentric shaft 9 as the center, clamps the plate 12 in conjunction with the clamping pressure wrench hole 10.
[0055] Each layer of electrode plate drying module is composed of a first plate clamp electrode 13, a second plate clamp electrode 14 and a pre-dried plate 12; a second hole 15 and a third hole are opened at both ends of each plate clamp electrode, through which the first through-plate connecting rod 4 and the second through-plate connecting rod 5 pass, and the plate clamp electrodes have good conductivity; the first plate clamp electrode 13 and the second plate clamp electrode 14 are placed at equal distances according to the process length of the pre-dried plate 12, and a pre-dried plate 12 is placed on top to form an electrode plate drying module, and the plate clamp electrodes of each layer of electrode plate drying module are operated in sequence to form the first layer electrode plate drying module 1, the second layer electrode plate drying module 2, and the nth layer electrode plate drying module 3. The first layer electrode plate drying module 1, the second layer electrode plate drying module 2, and the nth layer electrode plate drying module 3 are stacked together, and the plate clamp electrodes of each layer of the electrode plate drying module are connected together through the first through-plate connecting rod 4, the second through-plate connecting rod 5, the third through-plate connecting rod 6 and the fourth through-plate connecting rod 7, and the plates in the first layer electrode plate drying module 1, the second layer electrode plate drying module 2, and the nth layer electrode plate drying module 3 are clamped through the clamping cam 8 to form an electrode plate drying unit 21; the electrode plate drying unit 21 is placed on the sliding trolley 32 and placed in the gas collecting hood 22, and the first plate clamp electrode 13 and the second plate clamp electrode 14 of the electrode plate drying unit 21 are connected to the power supply and heating system.
[0056] When a certain voltage is applied between the first plate clamp electrode 13 and the second plate clamp electrode 14 of each layer of electrode plate drying module, current will flow through the corresponding plate, and heat generated under the action of water resistance will be converted into water vapor and discharged. Since a certain gap is left between the first layer electrode plate drying module 1, the second layer electrode plate drying module 2, and the nth layer electrode plate drying module 3, it is conducive to air flow to exchange heat, thereby promoting dehumidification and heat dissipation of the pre-dried plate 12.
[0057] The gas collecting cover 22 includes a gas collecting cover body 20, a telescopic heating electrode group, and hot and cold air inlet and outlet ports 24;
[0058] Among them, the gas gathering hood 22 is placed on the sliding trolley 32, the bottom of the gas gathering hood body 20 is open, and the outside of the gas gathering hood body 20 is equipped with hot and cold inlet and exhaust ports 24, which are connected to the heat storage and heat exchange system and the cold air pipe 25 in a time-sharing manner. During the drying process, the hot and cold inlet and exhaust ports 24 are connected to the heat storage and heat exchange system to store the water vapor generated when the wood is dried in the compressed gas storage; during the heat dissipation process, the hot and cold inlet and exhaust ports are connected to the cold air pipe 25, and the process harmful dry gas or low-temperature dry gas connected to the other end of the cold pipe 25 is recovered and transported to the plate drying and gasification process through the gas filtration of the gas gathering hood 22, the first layer electrode plate drying module 1, the second layer electrode plate drying module 2, and the nth layer electrode plate drying module 3, and the heat recovery pipe 33 of the transmission platform.
[0059] Among them, Figure 4 As shown, the telescopic heating electrode group is installed on the gas collecting cover 20 and consists of a first telescopic heating electrode 26 and a second telescopic heating electrode 27. Each telescopic heating electrode includes an electrode contact plate 18, a terminal 16 and a spring 17.
[0060] Each electrode contact plate 18 is provided with a terminal 16 and is covered with a spring 17. Each telescopic heating electrode can move up and down under the action of the spring 17. The terminal 16 is connected to the power supply and heating system.
[0061] During the plate drying and gasification process, the first telescopic heating electrode 26 and the second telescopic heating electrode 27 are acted upon by the spring, and the electrode contact plate 18 on each telescopic heating electrode is respectively crimped with the first plate clamp electrode 13 and the second plate clamp electrode 14 of each layer of electrode plate drying module, thereby providing heating current to the plate 12; during the plate heat dissipation process, the first telescopic heating electrode 26 and the second telescopic heating electrode 27 are lifted and separated from the first plate clamp electrode 13 and the second plate clamp electrode 14 of each layer of electrode plate drying module.
[0062] The heat storage and heat exchange system includes a heat storage and heat exchange tank 40, an induced draft fan 41, an electrically controlled three-way valve 36, a temperature regulator 42, a water vapor pipeline 43, and other process gas pipelines 28.
[0063] One end of the induced draft fan 41 is connected to the hot and cold air inlet and outlet 24 of the air collecting hood 22 through a steam pipe 43.
[0064] The other end is connected to the heat storage and heat exchange tank 40 through a pipeline and an electrically controlled three-way valve 36. The electrically controlled three-way valve 36 includes three interfaces and a solenoid valve. Two interfaces of the electrically controlled three-way valve 36 are connected in series between the induced draft fan 41 and the heat storage and heat exchange tank 40, and the other interface is connected to the atmosphere or fire extinguishing gas.
[0065] When the electromagnetic valve is not working, the induced draft fan 41 is connected to the heat storage and heat exchange tank 40, and the water vapor generated during the plate drying process is discharged into the heat storage and heat exchange tank 40 by the induced draft fan 41. Adjusting the wind speed of the induced draft fan 41 can change the air flow rate during the plate drying process, and can dynamically adjust the plate drying efficiency and quality.
[0066] During the board drying process, the controller 44 monitors the temperature inside the gas hood 22. When the temperature reaches the upper limit or a fire alarm is issued, the electromagnetic valve operates to connect the induced draft fan 41 to the ambient atmosphere or fire extinguishing gas. The controller 44 controls the induced draft fan 41 to change the wind direction and increase the wind speed, so that the ambient atmosphere acts on the drying board to quickly cool it down or reduce the oxygen content, thereby achieving the effect of extinguishing the fire.
[0067] In addition, the heat storage and heat exchange tank 40 is connected to one end of a temperature regulator 42 through a pipeline, and the other end of the temperature regulator 42 is connected to the other process gas pipeline 28 through a pipeline. The gas in the heat storage and heat exchange tank 40 is heated or cooled by the temperature regulator 42 to meet the gas needs of other processes.
[0068] The power supply and heating system includes a controller 44, an intelligent power supply 45, sensors, and control switches. The controller 44 is embedded in the intelligent power supply 45. Sensors and control actuators are installed in corresponding devices and connected to the controller via wireless or wired communication. The controller 44 monitors the operating status of all devices in real time and, based on models and algorithms, generates corresponding control strategies, implementing process control through corresponding control actuators. The output cable 46 of the intelligent power supply 45 is connected to the terminals 19 on the first and second telescopic heating electrodes 26 and 27, respectively, providing power to the electrode plate drying unit 21. The output power of the intelligent power supply 45 is based on the output power of the plate drying target model, which includes the moisture content of the wood, the length, width, and height of the plate, the plate type, the optimal process temperature, the efficiency, and the ambient temperature.
[0069] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A water collecting electrode plate drying and steam generation system, characterized in that: It includes an electrode plate drying unit, a gas collecting hood, a power supply and heating system, a conveying platform, and a heat storage and heat exchange system; wherein the conveying platform is placed in the plate processing room, and the electrode plate drying unit is placed on the conveying platform and placed in the gas collecting hood; the gas collecting hood is provided with hot and cold air inlet and outlet; the power supply and heating system is placed in the power distribution room, and the on-site equipment information is collected and controlled through wired or wireless transmission. The power supply of the electrode plate drying unit is connected to the telescopic heating electrode group of the gas collecting hood through a cable; the heat storage and heat exchange system is placed around the plate processing room and is connected to the gas collecting hood and other process gas pipelines through pipelines; the conveying platform includes a sliding carriage, which carries the electrode plate drying unit and the gas collecting hood; The electrode plate drying unit includes a first-layer electrode plate drying module, a second-layer electrode plate drying module, an n-th layer electrode plate drying module, a first through-plate connecting rod, a second through-plate connecting rod, a third through-plate connecting rod and a fourth through-plate connecting rod; each layer of the electrode plate drying module is composed of a first plate fixture electrode, a second plate fixture electrode and a pre-dried plate; the first plate fixture electrode and the second plate fixture electrode are placed at equal distances according to the process length of the pre-dried plate, and a pre-dried plate is placed on top to form each layer of the electrode plate drying module, and the plate fixture electrodes are operated in sequence to form the first layer of the electrode plate drying module, the second layer of the electrode plate drying module and the n-th layer of the electrode plate drying module; The heat storage and heat exchange system includes a heat storage and heat exchange tank and an induced draft fan; wherein one end of the induced draft fan is connected to the hot and cold inlet and exhaust ports of the gas hood through a water vapor pipe, and the other end is connected to the heat storage and heat exchange tank through a pipe and an electrically controlled three-way valve; The gas collection hood includes a gas collection hood body, a telescopic heating electrode group, and hot and cold inlet and exhaust ports; wherein the gas collection hood is placed on a sliding trolley, and the bottom of the gas collection hood body is open. During the drying process, the hot and cold inlet and exhaust ports are connected to a heat storage and heat exchange system to store the water vapor generated during the wood drying in a heat storage and heat exchange tank; During the heat dissipation process, the hot and cold air inlet and outlet ports are connected to the cold air pipe. The process-harmful dry gas or low-temperature dry gas connected to the other end of the cold air pipe is filtered through the gas collection hood, the first layer electrode plate drying module, the second layer electrode plate drying module, and the nth layer electrode plate drying module. The heat recovery pipe on the transmission platform recovers the heat and transmits it to the plate drying and gasification process. The telescopic heating electrode group is installed on the gas collecting cover and consists of a first telescopic heating electrode and a second telescopic heating electrode. The first telescopic heating electrode and the second telescopic heating electrode both include an electrode contact plate, a terminal and a spring. Each electrode contact plate is equipped with a terminal and a spring. The first telescopic heating electrode and the second telescopic heating electrode can move up and down under the action of the spring. The terminal is connected to the power supply and heating system. During the plate drying and gasification process, the first telescopic heating electrode and the second telescopic heating electrode are pressed against the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module under the action of the spring, providing heating current for the pre-dried plate; during the plate heat dissipation process, the first telescopic heating electrode and the second telescopic heating electrode are lifted and separated from the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module.
2. A water collecting electrode plate drying and steam generation system according to claim 1, characterized in that: The conveying platform also includes a first insulating rail, a second insulating rail, a platform bottom plate, and a heat recovery pipe; the sliding trolley is composed of an insulating pallet and four tray wheels, and a plurality of exhaust holes are evenly arranged on the insulating pallet; the first insulating rail and the second insulating rail are installed parallel to the platform bottom plate, and the sliding trolley is placed on the platform bottom plate and can move to complete the feeding, drying, and cooling processes respectively; The air inlet and outlet on the platform bottom plate are respectively connected to the two ends of the heat recovery pipe under the platform bottom plate, so as to recover the heat of the plate cooling process to the plate drying process, increase the basic heat of the plate drying process, and effectively utilize the waste heat.
3. A water collecting electrode plate drying and steam generation system according to claim 1, characterized in that: The first plate-penetrating connecting rod, the second plate-penetrating connecting rod, the third plate-penetrating connecting rod and the fourth plate-penetrating connecting rod all include a clamping cam, on which a cam eccentric shaft and a clamping pressure wrench hole are installed; each plate-penetrating connecting rod is a nail-shaped structure, with a first hole formed near the tip of the nail, through which the cam eccentric shaft passes, and the clamping cam, with the cam eccentric shaft as the center of the circle, clamps the plate in cooperation with the clamping pressure wrench hole; The first plate clamp electrode and the second plate clamp electrode are provided with a second hole and a third hole at both ends, through which the first through-plate connecting rod and the second through-plate connecting rod pass, and the first plate clamp electrode and the second plate clamp electrode have good conductivity; the first layer of electrode plate drying module, the second layer of electrode plate drying module and the nth layer of electrode plate drying module are stacked together, and the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module are connected together through the first through-plate connecting rod, the second through-plate connecting rod, the third through-plate connecting rod and the fourth through-plate connecting rod, and the plates in the first layer of electrode plate drying module, the second layer of electrode plate drying module and the nth layer of electrode plate drying module are clamped by a pressing cam to form an electrode plate drying unit; the electrode plate drying unit is placed on a sliding trolley and placed in a gas collecting hood, and the first plate clamp electrode and the second plate clamp electrode of the electrode plate drying unit are connected to the power supply and heating system; When a certain voltage is applied between the first plate clamp electrode and the second plate clamp electrode of each layer of electrode plate drying module, current will flow through the corresponding plate, and the heat generated under the action of water resistance will be converted into water vapor and discharged. Since a certain gap is left between the first layer of electrode plate drying module, the second layer of electrode plate drying module, and the nth layer of electrode plate drying module, it is conducive to air flow to exchange heat, thereby promoting dehumidification and heat dissipation of the pre-dried plate.
4. A water collecting electrode plate drying and steam generation system according to claim 1, characterized in that: The heat storage and heat exchange system also includes an electrically controlled three-way valve, a temperature regulator, a water steam pipeline, and other process gas pipelines; Among them, the electric-controlled three-way valve contains three interfaces and one solenoid valve. Two interfaces of the electric-controlled three-way valve are connected in series between the induced draft fan and the heat storage and heat exchange tank, and the other interface is connected to the atmosphere or fire extinguishing gas; When the electromagnetic valve is not working, the induced draft fan is connected to the heat storage and heat exchange tank, and the water vapor generated during the plate drying process is discharged into the heat storage and heat exchange tank by the induced draft fan. Adjusting the wind speed of the induced draft fan can change the air flow rate during the plate drying process, which can dynamically adjust the plate drying efficiency and quality; During the drying process of the boards, the controller monitors the temperature inside the hood. When the upper temperature limit is reached or a fire alarm is triggered, the electromagnetic valve operates to connect the induced draft fan to the ambient atmosphere or fire extinguishing gas. The controller controls the induced draft fan to change the wind direction and increase the wind speed, so that the ambient atmosphere acts on the drying boards to quickly cool them down or reduce the oxygen content, thereby achieving the effect of extinguishing the fire. The heat storage and heat exchange tank is also connected to one end of the temperature regulator through a pipeline, and the other end of the temperature regulator is connected to other process gas pipelines through a pipeline; the gas in the heat storage and heat exchange tank is heated or cooled by the temperature regulator to meet the gas needs of other processes.
5. A water collecting electrode plate drying and steam generation system according to claim 4, characterized in that: The power supply and heating system includes a controller, an intelligent power supply, a sensor and a control switch; wherein the controller is embedded in the intelligent power supply; the sensor and the control actuator are installed on the corresponding device and connected to the controller through wireless or wired communication. The controller monitors the working status of all devices in real time and realizes process control through the corresponding control actuator; the output cable of the intelligent power supply is respectively connected to the terminal blocks on the first telescopic heating electrode and the second telescopic heating electrode, serving as the power supply of the electrode plate drying unit; the output power of the intelligent power supply is output according to the plate drying target model, which includes the moisture content of the wood, the length, width and height of the plate, the plate type, the optimal process temperature, the efficiency and the ambient temperature.