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Selection of microwave drying equipment

微信图片_20210915104325微信图片_2022040711302613Herb microwave drying and sterilizing machine (1)Microwave equipment materials: material is one of the main factors affecting the price of equipment, so customers must be clear equipment materials when the purchase of microwave equipment materials, to make the best use of things.

Input power and output power of microwave equipment: Microwave output power refers to the real microwave power that acts on the material, and the input power refers to the total power consumed by the equipment, including all electrical components.

The service life of a successfully designed microwave equipment is very long, its mechanical part because of the slow speed, low load, generally rarely failure.If the cavity part is fed enough, there is almost no chance of a problem.The rest is the electrical part.The electrical magnetron (microwave generator) is an electric vacuum device with a certain service life.Under normal use conditions, the service life is generally 4000-5000 hours. If the control part is designed in place, the service life of more than 8000 hours is also very normal.Microwave drying equipment hot air by the inlet pipe in tangent direction into the ring gap at the bottom of the dry chamber, and spiral rise, at the same time, the material quantitative into the feeder, and full heat exchange with hot air, larger wet material under the action of the mechanical crushing, low wet content and small granularity material rises with the rotating airflow, transported to the separator for gas solid separation, finished product packaging, and exhaust gas is emptied after the dust removal device treatment.

Microwave curing, drying is the microwave generator will microwave radiation to the drying material and penetrate into the interior, inducing the water of the material to rotate synchronously, rotating billions of times per second.Only in terms of drying rate, the material is highly dispersed in hot air, the critical moisture content is low, the drying speed is fast, and the same convection drying, drying method is different critical moisture content is different, so the drying rate is also different.As a result of such high-speed rotation, the material produces instantaneous friction heat, resulting in the simultaneous heating of the material surface and the internal surface, and the internal temperature is higher than the surface temperature of the material, making the enzyme lose its vitality, and some water molecules evaporate at the same time, so as to achieve the purpose of finishing and drying.This finishing and drying method is characterized by short heating time, consistent internal and external temperature, and consistent heat transfer direction from the inside out and wet transmission direction.

Different from the conventional heating method, which takes a certain time to heat heat from the outside to the inside of the material, there is the problem of internal and external temperature difference and the opposite direction of wet and heat transfer. Microwave can penetrate into the material internal heating and without the characteristics of high temperature thermal medium, when applied in tea processing, fundamentally changed the dependence on high temperature medium and heat conduction mode heating conventional heating way, at the same time due to the microwave electromagnetic field in the filming, drying process has the thermal effect, greatly shorten the processing time, shows the unique advantages of microwave.Different drying methods have different energy consumption indexes. The thermal efficiency of general conduction drying can theoretically reach 100% theoretically, and convection drying can only be about 70%.

Post time: Jun-09-2022