Dryers commonly used in clean workshops
Dryers commonly used in clean workshops
Dryers can be classified according to different characteristics such as operation process, operation pressure, heating method, wet material movement method or structure, etc. According to the operation process, the dryer can be divided into two types: intermittent type and continuous type; Divided into two types of atmospheric dryers and vacuum dryers, in...
Text label: Dryers commonly used in clean workshops, design and installation of clean workshops
Dryers commonly used in clean workshops
Dryers can be classified according to different characteristics such as operation process, operation pressure, heating method, wet material movement method or structure, etc. According to the operation process, the dryer can be divided into two types: intermittent type and continuous type; It is divided into two types: atmospheric pressure dryer and vacuum dryer. Operating under vacuum can reduce the partial pressure of moisture vapor in the space and accelerate the drying process, and can reduce the boiling point of moisture and drying temperature of materials, and the steam is not easy to leak. Chamber dryer is a typical equipment often used in atmospheric intermittent drying operation. There is a trolley with multi-layer brackets in the drying chamber with thermal insulation on the outer wall. There is a discharge tray on each layer. The air is introduced from the upper right corner of the chamber, and the air is preheated. The function of the device is to continue heating the air during the drying process to keep the air at a certain temperature. In order to control the air temperature, a part of the hygroscopic air can be recycled for use; the advantages are simple structure, easy manufacture, convenient operation, strong adaptability and wide application range. , Each batch of materials can be processed separately, and the temperature can be changed appropriately. Since the materials are in a static state during the drying process, it is especially suitable for brittle materials that are not allowed to be broken; the disadvantage of the chamber dryer is intermittent operation, long drying time, and drying Uniform, large volume of equipment required to complete certain drying tasks, manual loading and unloading, and high labor intensity.
Spray dryer is a method of applying systematic technology to material drying. Through mechanical action, the material to be dried is dispersed into very fine mist-like particles, which are contacted with hot air, and most of the material to be dried will be dispersed in an instant The water is removed, and the solid matter in the material is dried into powder. This method can directly dry the solution and emulsion into powder or granular products, which can save processes such as evaporation and pulverization. The advantage of spray drying is that the drying speed is fast, In the constant speed stage, the temperature of the droplets is close to the wet bulb temperature of the high-temperature air used, and the product quality will not be affected by the high-temperature air. The product has good dispersibility, fluidity and solubility. The production process is simple and the operation and control are convenient. , easy to realize automatic production, suitable for continuous large-scale production. The disadvantage is that the equipment is complex, covers a large area, and has a large one-time investment; the atomizer and powder recovery device are expensive, require a large amount of air, increase the power consumption of the blower and the capacity of the recovery device; the thermal efficiency is not high, and the heat consumption is large; spray The drying applications mainly include heat-sensitive materials and biological products, which are basically close to the standard of drying under vacuum. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and clean workshops.
Belt dryer is the most commonly used continuous drying device. According to the number of belt layers, it can be divided into single-layer belt type and composite-layer belt type. According to the hot air flow mode, it can be divided into vertical downward and vertical upward. Or compound flow, according to the exhaust method, it can be divided into countercurrent, cocurrent or separate exhaust; the advantage of belt dryer is that the material is stacked on the horizontal conveyor belt made of wire mesh or perforated plate in a forbidden state. Dry, so the material is not damaged by vibration, impact, or crushing, and can maintain the shape of the material; the use of compound ventilation is conducive to maintaining uniformity and increasing the drying rate, and the dried product can be discharged in a cooled state; composite or multi-layer The belt type can make the material reverse or turn over, so that the surface of the material is continuously in the drying medium, which can increase the thickness of the material layer in the deceleration drying stage, improve the drying speed, or change the layer belt to adjust the residence time of the material, which can be continuously dried at the same time. A variety of solid materials; according to the different properties of the materials to be dried, the materials of the conveyor belt can be canvas, rubber, rubberized cloth, stainless steel mesh or metal perforated plate, etc., the operation is stable and reliable, and the cleaning is convenient; there is a continuous cleaning device on the rotating conveyor belt, It prevents the contamination of dry matter, is airtight, and has a good operating environment; the disadvantage is that the production capacity and thermal efficiency are low. For the treatment of non-ventilated materials such as mud filter cake, it must be made into 3-8mm granular or rod shape in the feeding part. to dry.
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