Microwave is a form of electromagnetic energy (300 Mhz–300 GHz), generated by magnetrons. For the industrial microwave, the common frequency used is 915 Mhz and 2450 Mhz. 915Mhz has a stronger penetration ability than 2450Mhz, and single microwave magnetron could be 75Kw under the 915Mhz.However, magnetron is 1kw by 2450Mhz with relative lower cost. 915Mhz microwave frequency is introduced in meat & fish defrost, Ore desulfurization, smelting industry and vulcanization application. The 2450Mhz microwave frequency is almost employed for all applications, but the penetration ability is weak than 915Mhz. And the material is heated with microwave radiation, heat is transferred inside to outside so the penetration heating technology is an attractive method to many issues in the drying/heating process.

How Do We Choose Microwave Drying Machine?

When we decide to choose microwave drying machine, we need put together all information to assess a viable operation and energy efficient. Firstly, you need know how much moisture the material containers prior to microwave drying, and what’s the final target moisture content so we could know the evaporation water amount. For example, 500 kg/h capacity with 30% initial water saturation, and require to reduce moisture down to 8% so 500*0.3-500*0.08=110 kilogram of water which we should evaporate per hour. Secondly, we should know the material features and react to microwave. If you have a material with a high dielectric loss tangent though, this will be larger. Also, if you have a material that is highly receptive to microwaves then you may want to consider drying over a longer time period to avoid unwanted heating of the base material. Thirdly, we may calculate how much kilowatts machine you need employ. Generally speaking, we would consider to use 1kw.h microwave energy to process 0.8 kg~09 kg moisture per hour under the regular environment temperature( 18℃) Also, we customize different model and capacity machine according to your real requirement to use either tunnel conveyor, standard batch oven or vacuum oven machine.

How Do We Wisely Choose Industrial Microwave?

Drawback—The capital cost of industrial microwave drying machine is normally higher than traditional drying machine. Even microwave is produced from an electrical power source, with up to 94% conversion efficiency from electricity to microwave energy. Also, in some countries and areas, the cost of electricity is higher than gas or coal energy. Therefore, if we would dry low-value material with high moisture content, we really should think about our budget, electricity consumption and the final products value. Apart from the machine, we also need provide a better cooling environment for magnetrons so running cooling water or cooling air would be necessary. And cooling water has a better cooling result than air cooling. Therefore, we may need install a big volume water tank or water cooling machine as auxiliary equipment. Industrial microwave heating process does not suit for very project and product. We need understand the drawback of industrial microwave machine.

Application- The industrial microwave drying/heating could obtain better quality products with a faster process. But in some fields, we need combine microwave with other drying solution to achieve a better drying result. For example, for drying some fruit or vegetable, microwave vacuum drying is an emerging technology to perfect dry and perverse fruit original shape and color. Because in the vacuum condition, the low drying temperature heat the material gentle without oxygen treat for the product as well as dry products with a better flavor and minimize products nutrition losses. If high microwave heating directly works on the products, high sugar parts of fruit may cause burnt. So, it’s not a good idea to dry slice fruit or vegetable under a simple microwave radiation. In other applications, we may combine hot air, IR with microwave energy to process high water content products which can reduce the power consumption and minimize the drying time.

Advantages- we must fully understand the microwave machine advantage then we could properly take advantage of it. Firstly, what’s the difference between microwave machine and conventional drying method, microwave penetrate into much greater depths which means the temperature inside of product is higher than outside so it forms a higher partial pressure that drives the evaporating water to the surfaces. Consequently, the inside of product could be properly heated with low thermal conductivity. Traditional dryer need employ high thermal energy gradually heat the core part of products, and drying methods approach material from the surface, applying heat only to the outside edges. Because volume heating does not reply on heat transfer by conduction or convection, it is possible to use microwave heating for applications where conventional heat transfer is inadequate.

1. Small machine footprint and simple control panel

2. Minimize machine running times with non-contact drying solution

3. It’s a totally environmentally friendly machine which avoids combustible gaseous by-products, eliminating the need for environmental permits and improving working conditions.

4.As we could short the process time, microwave heated edible food retain a higher percentage of flavors and nutrients.

5. The machine is more controlled by reduce or add more magnetrons power

6. In the food industry, where microwave processes not only remove the water but also prove to sterilization or pasteurization, baking, roasting and cooking etc.

7. Microwave machine reduce burner and boiler equipment, use high power densities to increase products rates.

8. If we need an extremely lower moisture content product (under 8% moisture content), microwave would be economic drying solution to apply.

Industrial microwave is gradually considered as a viable drying solution due to strict environment policy and time saving. In some fields, traditional drying solution either not able to meet with drying result or take a long time to process. But the unique microwave heating method would be highly efficiently to process products. We would like you to bring products to our factory for a test, and we would find out whether microwave heating make sense or not. Before you enter the lab test, our experienced sale team would also like to contact you in advance so we could understand your project and products. It may be one of the best decisions you ever make.