Raw materials are spreaded on the conveying belt through suitable auxiliary mechanism such as distributor, vibrating belt, pulverizer of granulator, belt passes the channel which containing one or several heating units; heating unit is equipped with air heater and circle system. Each channel has one or several damp exhaust system. When raw material is transited, hot air passes through or over it. In this way it makes raw material dry uniformly.
The natural pollen produced by the 2450MHz, 45KW tunnel type microwave drying and sterilizing machine realizes continuous production, the production efficiency is increased by several times, the power saving is more than 80%, the product quality is good, and the economic benefit is remarkable.
The microwave heating work in the heating -room and waveguide pipe made of metal,which can prevent the leakage of the microwave, radioactivity harmful and discharge of gas.There is no waste heat and dust pollution,so microwave heating neither contaminate food nor pollute the environment.