KR100537455B1 - Continuous feeding dryer for insulating material using microwave heater by variable output - Google Patents

Abstract

      The present invention relates to a continuous drying device of heat insulating material using variable power microwave heating, and more specifically, to a semi-cylindrical, hexahedral shape by mixing silicon and sodium silicate into perlite particles to have a water content of about 30%. It relates to a drying apparatus for continuously drying the heat insulating material using microwave heating of the output variable type to produce a heat insulating material by drying up to 3%.

      The present invention is required to continuously dry the insulation to a certain level without a change in the drying quality in accordance with the change of the drying load, it is necessary to physically change during the drying of the insulation It detects the characteristics of the flow air and optimizes the conditions such as microwave output or hot air temperature, conveyor speed, etc., and is composed of an additional feeder and microwave output device.

      Continuous drying device of heat insulation material using variable power microwave heating can achieve 20 times faster drying than conventional hot air drying, which can save energy. Realization of automation and workforce by efficient continuous drying process In this way, productivity and cost reduction can be achieved, and quality superior to existing drying quality can be ensured.

Description

Continuous Feeding Dryer for Insulating Material Using Microwave Heater by Variable Output}

      The present invention relates to a continuous drying apparatus of heat insulating material using variable power microwave heating, and more specifically, to a semi-cylindrical, hexahedral shape by mixing silicon and sodium silicate into perlite particles, and having a water content of about 30%. The present invention relates to a drying apparatus for continuously drying a heat insulating material by using microwave heating of an output variable type to dry the heat insulating material by 3%.

      It is a common phenomenon in the industrial field to make a new material by mixing a suitable hardener or binder with a particle or powder material and molding it into a certain shape and curing or drying it. These are ceramics, bricks, etc., and the ceramics field is representative of them.

      Efforts have been made to uniformly dry the heat insulating material at a faster time than the natural drying, and Korean Patent Publication No. 184227 discloses a method of manufacturing a prefabricated nonflammable panel using glass or rock wool as raw materials. This is a cotton or impregnated glass or rock surface impregnated with phenolic resin, which is loaded on a lower steel plate and passed between upper and lower conveyors to form a certain thickness and density, which is cured by high frequency heating, and then phenolic resin on the surface of the heat insulating material. A polyvinyl acetate emulsion was applied to the film, followed by dry curing with hot air to prepare an insulation panel.

       However, such a method of manufacturing a heat insulating panel has a problem that it is difficult to heat the panel quickly despite a lot of power consumption because the high frequency dielectric heating method is used for drying the panel.

      Meanwhile, hot air drying, vacuum drying, and infrared heating drying are used as drying apparatus in the insulation panel manufacture. Since hot air drying uses heat sources such as steam, direct and indirect combustion heat, and electric heaters, the objects to be dried If flammable solvents are included, there is a significant risk potential and there is a disadvantage that the concentration of the gas must be kept low with fresh air at all times. In addition, vacuum drying is a method of evaporating and drying a liquid by reducing the boiling point of the liquid by reducing the drying point of the drying chamber, and a separate heating means is used in combination. . In addition, in the case of hot air drying and infrared heating drying, there is a fear of poor quality of the insulation panel due to local heating.

      Another attempt is disclosed in Korean Patent Publication No. 0374364, which impregnates a surface formed by impregnating powdery thermosetting binders such as phenolic resins and epoxy resins with rock wool, glass wool and ceramic fibers to induce heating of a conductor by induction heating with high frequency coils. At the same time, having a curing and drying process of curing and drying the molten binder by heating with a far infrared heater was not sufficient to heat the panel from within and to dry uniformly in a short time.

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      Conventional manufacturing process is a device for producing insulation by mixing silicon and sodium silicate into perlite particles, forming a semi-cylindrical, hexahedral shape, and drying a water content of about 30% to 3%. After molding in Esau take out automatically, and after drying for 195 minutes by hot air of 200 ℃ in a drying room, the final product is produced, packaged and shipped. In this manufacturing process, drying takes a long time of 195 minutes, so it is hard to compose a drying process by using a continuous type that matches the working time of the molding machine. It was put in and dried while slowly passing through a drying tunnel of about 40 m.

      The drying method by such hot air has the following problems.

The conventional method uses hot air as a heat source for drying, so the heat transfer is performed by heat conduction from the surface of the heat insulating material to the inside, so that the drying time is long, and thus the drying efficiency is low. In addition, in the drying of thick (over 50mm thick) heat insulating material, the quality and deterioration of the curvature and water repellency of the product are deteriorated due to the unevenness of the dryness of the outer and inner parts. The production cost is increased because people are required to load and take out products, and it is difficult to expect productivity improvement due to the predetermined drying time. The existing method is caused by a kind of indirect heating method, which is inevitably caused by the heat source in the drying of the dried object to maintain a constant volume, and therefore, an apparatus for drying the dried product with high efficiency and high quality is required.

      The present invention has been invented to solve the above problems,

      An object of the present invention is to provide a heat insulating material drying apparatus using microwave heating applicable to the production process of the heat insulating material,

      Another object of the present invention is to provide a heat insulating material drying apparatus which shortens the drying time by heating the temperature deviation of the entire dried object within 1% in a short time to the inside of the dried object, as compared with the conventional method.

Microwave drying method is referred to as a dipole (dipole) rotation and vibration energy of the column is heated by microwave heating to these generated or dielectric heat from the friction of the interior in the molecule. Therefore, in the dried material having a large or small dielectric constant, microwaves penetrate into a large dielectric constant. In other words, when the dry object is a wet insulation material, the water contained in the entirety of the wet insulation material is directly heated rather than the dry insulation portion. This heating method is referred to as Electrical-Volumetric-heating method, and compared with the Conduction-heating method through the convection mentioned above, the temperature deviation of the entire dry matter in a short time to the inside of the dry matter is 1%. The heating time can be shortened, so that drying time can be shortened.

      Drying the molded insulation using microwave heating saves energy than conventional hot air drying, and improves productivity and reduces drying cost by applying continuous drying method that meets molding machine working time and achieves high quality drying. I am expected to. Accordingly, an object of the present invention is to provide a heat insulating material drying apparatus using microwave heating applicable to the production process of the heat insulating material.

      The present invention is required to continuously dry the insulation to a certain level without a change in the drying quality in accordance with the change of the drying load, it is necessary to physically change during the drying of the insulation It detects the characteristics of the flow air and optimizes the conditions such as microwave output or hot air temperature, conveyor speed, etc., and is composed of an additional feeder and microwave output device.

      The configuration of the present invention relates to a continuous drying apparatus of a heat insulating material using a variable power microwave heating, more specifically

      In the device for drying the heat insulator,

A transfer device for continuously transferring the heat insulating material;

A microwave heating device for drying the heat insulating material from the inside;

An electromagnetic leakage preventing device for preventing electromagnetic leakage;

Characterized in that consisting of a hot air drying device for generating hot air,

The microwave heating device includes a microwave oscillation device;

Characterized in that the electromagnetic wave uniform dispersion device,

      The microwave oscillator is characterized in that a combination of 30 (kWh) class fixed microwave output and 30 (kWh) class variable microwave output,

The electromagnetic uniform dispersion device is characterized by inducing uniform dispersion of energy by using a plurality of irradiation holes for electromagnetic waves (Window Array).

      In addition, the microwave oscillation device is characterized in that consisting of the material preheating section (A), constant drying section (B), and reduction rate drying section (C),

      The output port 40 of the material preheating section A, which is a constituent section of the microwave oscillation device, of the microwave heating device is arranged in detail to sharply increase the temperature of the product to be introduced, and the constant drying section B is The output port 40 has a wider interval and is uniformly arranged than the constant dry section (B), the reduced rate dry section (C) is characterized in that the interval is wider than the constant dry section (B) for fine drying. .

      In the following description of the accompanying drawings,

      1 is a view of a perlite-based heat insulating material, Figure 2 is a schematic diagram of a continuous drying apparatus of a heat insulating material using a variable power microwave heating, Figure 3 is a graph showing the change in drying time and water content according to the microwave output change, Figure 4 Is a graph showing the drying time and temperature change inside the insulation according to the microwave output change, FIG. 5 is a layout diagram of microwave input ports, FIG. 6 is a schematic diagram of hot air circulation and steam exhaust, and FIG. It is a continuous drying device.

Hereinafter, detailed structures will be described based on the accompanying drawings.

      1 is a view of a ferrite-based heat insulating material showing the heat insulating material to be dried in the present invention.

      2 is a schematic diagram of a continuous drying apparatus of a heat insulating material using variable power microwave heating, illustrating a schematic configuration of the present invention. The heat insulating material 15 is placed on the conveyor belt 17 and proceeds at a constant speed to be heated by a microwave 30 whose output is variable. The section in which the heat insulator 15 is input and the material is preheated is configured on the front of the inlet. This material preheating section A is a section in which the heat insulator 15 containing water is preheated. Therefore, it is one of the features of the present invention to use a combination of internal heating and external heating as it is possible to heat efficiently compared to the means for heating from the outside of hot air drying. The material preheating section (A) refers to the section just before the moisture contained therein starts to evaporate.

      The central part of the schematic diagram is a fragrance drying section (B). This section is a section in which the amount of heat to be heated starts to evaporate due to the change of internal temperature into evaporative heat due to the evaporation of moisture. Will decrease. After the evaporation of the moisture contained in the heat insulator 15 is almost completed, a section in which the temperature rises rapidly is formed, and this section is the reduction rate drying section (C). Since the heat reduction material (C) contains only a small amount of water, the heat insulating material (15) contains only a small amount of water. When a large amount of heat is heated in a short time, the internal temperature rises rapidly and the heat insulating material (15) is damaged. In the following, the amount of the microwave 30 is reduced to require fine control.

      The filter zone 25 is installed at the inlet and the outlet of the device to prevent high frequency leakage, and the microwave control system 22 connected to the main control panel 20 is configured to prevent the high frequency leakage. By controlling the output of the microwave applied to the output port is to control the power supply device 24 and the magnetron 26 so that the correct output is applied to the insulation 15. The conveyor belt 17 is also transferable by similar other means for transporting the insulation 15.

      3 is a graph showing a change in drying time and moisture content according to the microwave output change, and a graph showing how the amount of moisture contained in the heat insulating material 15 decreases according to the microwave output. Compared to the situation of eggplants, it can be dried in a short time at high output in case of high output, and moisture decreases almost linearly until moisture content is about 3%, but water content decreases compared to time at less than 3%. It will gradually decrease. Increasing the temperature of the heat insulating material 15 may cause carbonization or melting, or change in physical properties. Therefore, in order to secure product quality after drying, it is necessary to suppress the temperature rise during drying within the allowable temperature. The section where fine control is required using the output is called the deceleration dry section (C).

      4 is a graph showing the drying time according to the microwave output change and the temperature change inside the heat insulating material, and the drying time and output may be different according to the size and moisture content of the heat insulating material 15 or the dried object 16 and more. In the case of a dry body containing water, it is possible to cope by adjusting the conveying speed of the conveyor. Therefore, it is a facility which can be dried according to the kind and property of to-be-dried body 16. FIG.

      Looking at the temperature gradient in the figure, it can be seen that the temperature rises constantly in the material preheating section (A), and in the constant drying section (B), the temperature is kept constant, indicating that water is evaporating, and drying rate-sensitive Section (C) shows a section in which the temperature rises sharply because there is less moisture. When the 300W output is used, the three sections can be clearly distinguished, but the section using 600W can reduce the drying time, but it is difficult to obtain fine product quality because the division of the area is unclear. Therefore, if the characteristics of the graph can be obtained by dividing the characteristics into three areas, it is to show that it is possible to cope with the change in the output or the change of the dry matter 16 or the change in the content of moisture contained.

      FIG. 5 is a schematic diagram illustrating a microwave input port layout, and a schematic diagram showing three regions of a material preheating section (A), a constant drying section (B), and a reduction ratio drying section (C). In the material preheating section (A) of each section of the microwave oscillation device included in the microwave heating device, the output port 40 is finely disposed to sharply increase the temperature of the product to be introduced, and the material preheating section ( The output port 40 is arranged at one side of the constant dry section B of the A) at a wider distance than the material preheating section A. The output port 40 is output at one side of the constant dry section C of the constant dry section B. The port 40 is arranged to have a wider interval than the constant dry section (B) to dry fine. When the heat insulator 15 is inserted into the product inlet, the conveyor belt 17 transfers at a constant speed, passes through three areas to dry the product, and extracts the heat insulator 15 from the product outlet. Therefore, in previous facilities, the necessary personnel were needed only at the place of input and extraction.

      Figure 6 shows how to circulate the hot air in the hot air circulation and steam exhaust schematic, and in which direction the exhaust. Since hot air contains moisture, exhaust air is disposed in the direction of the heat insulating material 15 containing less moisture, that is, from the exit direction to the inlet direction, and the heat source of the hot air 70 is generated by an electric heater to favor recycling of waste heat. 45) was employed in five parts of the length of the drying chamber to change the direction of the hot air 70 to induce uniform drying of the heat insulating material (15). That is, the hot air is circulated (60) at two inlets of the product from the downward direction of the drying chamber to the upward direction, at the next two locations from the upward direction to the downward direction, and then at the last one location, the heat consumption is increased. Designed to be minimal. The generated water vapor is forced out through the exhaust port 55 installed at the inlet side, so that the hot air flows naturally from the outlet side to smoothly remove the water vapor that is pushed to the surface of the heat insulator during drying. In addition, the hot air is used at a temperature above the inversion point, which is advantageous for recycling the wet air, that is, 180-230 (° C).

      FIG. 7 shows a continuous drying apparatus of heat insulator using variable power microwave heating, which can automatically and continuously dry the heat insulator 15 in one device, thereby reducing manpower and improving productivity, and insulating material 15 of uniform quality. It is a drying device that can be obtained.

      As mentioned above, although the continuous drying apparatus of the heat insulating material using the variable-wavelength microwave heating which concerns on this invention was described, the scope of the present invention is not limited to this, Comprising: All the technical thought of the range equivalent to the matter of a claim is equivalent to it. You'll be crazy about it.

      As described above, the continuous drying apparatus of the heat insulating material using the variable microwave heating of the present invention can achieve about 20 times faster drying than the conventional hot air drying, which can save energy, and is an efficient continuous drying process. By realizing automation and reducing workforce, productivity and cost reduction can be achieved, and quality superior to existing drying quality can be secured.

1 is a view of a ferrite-based insulation,

2 is a schematic diagram of a continuous drying apparatus of a heat insulating material using a variable power microwave heating,

3 is a graph showing a change in drying time and moisture content according to a microwave output change,

Figure 4 is a graph showing the drying time and the temperature change inside the insulation according to the microwave output change,

5 is a layout diagram of microwave input ports,

6 is a schematic diagram of hot air circulation and steam exhaust,

7 is a continuous drying device of the heat insulating material using the variable power microwave heating.

** Explanation of symbols for the main parts of the drawings

15: heat insulating material 16: dry body

17: conveyor belt 20: main control panel

22: Microwave (MW) control system 24: MW power supply

25 filter zone 26 magnetron

28: wall hot air drying 30: microwave (MW)

40: output port 45: heater

50: blower 55: exhaust

60: circulation 70: hot air

Claims (6)

      In the device for drying the heat insulator, A transfer device for continuously transferring the heat insulating material; A microwave heating device for drying the heat insulating material from the inside; An electromagnetic leakage preventing device for preventing electromagnetic leakage; Continuous drying device of the heat insulating material using the variable power microwave heating, characterized in that consisting of a hot air drying device for generating hot air. The method of claim 1, The microwave heating device includes a microwave oscillation device; Continuous drying device of the heat insulating material using the variable power microwave heating, characterized in that the electromagnetic wave uniform dispersion device. The method of claim 2, The microwave oscillator is a continuous drying device of heat insulating material using a variable power microwave heating, characterized in that the combination of 30 (kWh) fixed microwave output and 30 (kWh) variable microwave output. The method of claim 3, wherein The electromagnetic uniform dispersion device is a continuous drying device of the heat insulating material using the variable microwave heating output, characterized in that to induce a uniform distribution of energy by using a plurality of irradiation holes of the electromagnetic wave (Window Array). The method of claim 4, wherein The microwave oscillation device is a continuous drying device of heat insulating material using a variable power microwave heating, characterized in that consisting of a material preheating section (A), constant drying section (B), and reduction rate drying section (C). The method according to any one of claims 1 to 5, In the material preheating section (A) of each section of the microwave oscillation device included in the microwave heating device, the output port 40 is finely disposed to sharply increase the temperature of the product to be introduced, and the material preheating section ( The output port 40 is arranged at one side of the constant dry section B of the A) at a wider distance than the material preheating section A. The output port 40 is output at one side of the constant dry section C of the constant dry section B. Port 40 is a continuous drying device of the heat insulating material using the variable-wavelength microwave heating, characterized in that the interval is wider than the constant drying section (B) to dry fine.