KR20070018136A - High Efficent Continuous Near-infrared Dryer - Google Patents

Abstract

The present invention relates to a high-efficiency continuous dryer using near infrared heater and vortex hot air, and to near-infrared method, which is a method of heating directly to a dry object, and indirect hot air method, which is dried by hot air. The dryer is characterized in that the hot air is supplied to the vortex as the waste heat is recovered and the high efficiency continuous dryer that reuses by mixing with fresh air (FRESH AIR) after partly removed by using a cooling radiator for cooling.

Near Infrared, Dryer, Continuous Dryer, Near Infrared Dryer

Description

High Efficent Continuous Near-infrared Dryer

1 is an overall view of the present invention

2 is a cross-sectional view taken along the line A-A '.

3 is a cross-sectional view taken along line B-B '.

※ Explanation of code for main part of drawing

① hot air fan

② Damper for intake vent

③ near infrared irradiation

④ Damper for exhaust port

⑤ mesh conveyor

⑥ Waste heat recovery machine

⑦ refrigerant

⑧ Refrigerant

⑨ Radiator

⑩Damper for Fresh Air Injection

⑪ Condensate drain valve

⑫ Spirial screw (for vortex)

⑬ Thermometer and temperature sensor

Quality problems such as excessive energy loss due to the low thermal efficiency of the existing hot air drying method, productivity decrease due to delayed drying time, reduced product yield and reduced flexibility, and most of the heat retained are used for temperature rise and moisture evaporation. Since most of the hot air is released as it is except for heat radiation loss, the exhaust air of the humid air is large and the amount of heat taken out by the exhaust gas is large, so the energy loss is large and only the surface part is too dry due to the different moisture distribution between the surface and the inside of the object. In the case of the drying method using only far infrared rays, the quality of the dried material is better than that of the existing hot air drying method, but it takes a long time to dry and shortens the life of the irradiator compared to the near infrared irradiator.

Japanese Patent Laid-Open No. 62-117661 carries a sheet of water-coated wax coated on a belt and moves it to a drying chamber while drying it with a far-infrared heater while blowing hot air from a plurality of nozzles installed on the ceiling side, and at the same time, installing it under the far-infrared heater. Although it is configured to intake air into the blower through a porous wall plate, the efficiency is considerably lowered due to the emission of heat from low-infrared radiation (the optimal temperature suitable for good emission of the far-infrared wavelength is 400-500 ° C). It is pointed out that the problem is that the interior of the drying chamber is overheated because it is only used as an auxiliary means in the drying process, and the main drying is dependent on heat.

Japanese Patent Application No. 62-164590 is a drying apparatus configured to move a conveyor loaded with dry matter in a heater box in which an irradiator is installed, and a preheating furnace in which a far-infrared irradiator is arranged at the bottom of the conveyor in the heater box, and at the top of the conveyor. It was pointed out that, although the polishing furnace in which the far-infrared irradiator was arranged is installed in succession, the forced circulation device is installed in the preheating furnace and the polishing furnace, but also the efficiency is lowered due to the low heat of dissipation.

Korean Patent Application No. 91-4046 divides the drying chamber into a far-infrared drying chamber and a heating drying chamber equipped with an electric heater, and is configured to have a circulation facility for even temperature distribution in the drying chamber. There is a fear that the to-be-dried material may be over-dried by overheating in a drying chamber.

Korean Patent Application No. 0129801 has a drying furnace composed of pre-drying room and post-drying room. In the pre-drying room, the high-temperature of 400-500 ℃ emitted from the upper and lower irradiates toward the conveyor to be transported with the to-be-dried material. While directing the radiation of the wavelength, a linear heat shield is formed on the top and the bottom of the conveyor, so that the ambient temperature of the conveyor is maintained at room temperature under high heat interruption, and dried at room temperature by the radiation of far-infrared wavelength. However, it was pointed out that, in the case of the dry matter with high moisture, it is difficult to expect high efficiency by using far infrared rays alone compared to a dryer mixed with hot air.

The present invention is to improve the problems as described above is effective to adjust the distance between the dried object and the near-infrared irradiator in drying by using near-infrared rays that can directly raise the temperature of the object to be affected by the outside air It is an object of the present invention to provide a continuous drying method capable of drying and an apparatus thereof.

Still another object of the present invention is to provide a continuous drying method and apparatus for recovering and reusing hot air and supplying hot air to vortex for efficient drying and energy saving.

Still another object of the present invention is to reduce the drying time and increase the thermal efficiency of the dried items with a lot of hot air and near-infrared devices, thereby contributing to energy saving and energy efficiency, improving quality and drying speed, and increasing productivity. To provide a high efficiency continuous drying method and apparatus therefor.

In order to achieve the above object, the present invention has a near-infrared irradiator (③) positioned horizontally in the drying chamber with the mesh conveyor for moving the workpiece to the upper and lower sides, and the hot air inlet and the exhaust port are diagonally positioned at the upper and lower portions, respectively. It has a suction inlet control DAMPER (②) and an exhaust outlet control DAMPER (④), and the hot air that enters the inlet of the dryer (⑤) by using the hot air fan (①) enters the waste heat recovery machine (⑥) through the exhaust port, and the lazietta (⑨) After removing some of the moisture through the hot air blower (①), it is reused through the hot air blower (①), and there is a DAMPER (⑩) for supplying FRESH AIR in the waste heat recovery machine (⑥). ) Is supplied to the hot air with hot air recovered.

The radiator should be supplied with coolant or cold air to the refrigerant (⑦) to remove the moisture generated in the drying room as much as possible. The used refrigerant (⑧) is adjusted to an appropriate temperature to minimize the humidity with a hygrometer attached to the waste heat recovery device. Supply it to the radiator and lower the temperature by using a cooling tower or a freezer.

Each suction control DAMPER (②) and exhaust control DAMPER (④) look at the thermometer and temperature sensor (⑬) for each part and adjust the exhaust amount and intake amount appropriately so that the ambient atmosphere temperature is always kept above a certain level. The temperature sensor is electrically connected to the near-infrared irradiator around it to regulate the energy supply to maintain a constant temperature, and the temperature sensor attached to the hot air fan is electrically connected to the energy supply device to regulate the energy supply of the hot air fan.

As described above, the present invention is a very useful invention that can contribute to energy saving and productivity increase by increasing the drying rate of the wet and dry goods by using near infrared rays and hot air, improving the drying quality, and recovering and reusing hot air.

Claims (3)

There is a near-infrared irradiator that can adjust the upper and lower position on the upper and lower mesh conveyor to transfer the dry object in the entire drying room, and the hot air is circulated in the upper and lower parts of the drying room, and the used hot air is recovered to reuse after removing moisture. High efficiency continuous near infrared drying method The hot air supplied to the upper and lower parts of the entire drying chamber is supplied by the hot air fan, and the used hot air is recovered by the waste heat recovery machine and reused by the radiator after the moisture is removed by the radiator, and the energy supply of the near-infrared irradiator and the hot air fan is electrically supplied. High efficiency continuous near-infrared dryer, characterized in that it is configured to be controlled by connecting to a temperature sensor High-efficiency continuous near-infrared dryer characterized in that the hot air supplied to the upper and lower parts of the entire drying chamber is supplied to the drying chamber by vortex while passing through the spirial screw.

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