Microwave dryer and microwave drying method

A microwave drying method for physically drying and recycling a waste material employing a microwave dryer, the microwave dryer comprising:

• a material collection compartment having an input port through which the material to be dried is fed into said material collection compartment;
• a dryer body comprising at least one microwave vibration head configured on an inner wall of said dryer body for generating microwaves to dry said material and to heat air to produce hot air in said dryer body, said dryer body further comprising a hot air extraction port;
• a propeller having an output port laterally arranged relative to a length of the propeller, wherein the propeller is connected to said material collection compartment and said dryer body for delivering said material to be dried from said material collection compartment through said output port to said dryer body, and connected to a motor and a gearbox for driving the propeller and changing a rotational speed of the propeller at which said material to be dried is propelled, compressed and discharged in a paste form;
• a conical, oval conical or hood-shaped wind screen with its conical top facing upward, wherein an outermost edge of said wind screen and said inner wall of said dryer body are arranged with a gap;
• a circular or ovoid or ovoid base having a central hole in communication with a hot air input port arranged at a bottom of said dryer, and said base being configured to be spaced apart from said wind screen to define a space therebetween;
• and
• an air blower connected to said hot air extraction port of said dryer body, through which said air blower delivers the hot air extracted from said dryer body back to the space defined by said wind screen and said base through the hot air input port arranged at the bottom of said dryer and the central hole, the hot air delivered into said space being guided such that the hot air is able to only flow substantially transverse to said wind screen and goes upward along the gap between said wind screen and said dryer body to fill up and rotates inside an entire interior of said dryer body, so as to disperse and suspend said material to be dried inside the dryer body;
• wherein the rotation of the hot air dries the suspended material to dryness, and the dried material is outputted in a form of particles or powders, comprising the following steps:
• (1) inputting the material to be dried into said material collection compartment of said microwave dryer;
• (2) providing said propeller to deliver said material to be dried from said material collection compartment into said dryer body of the dryer, and at the same time to squeeze out water from said material to be dried, said propeller having an adjustable hole at said output port thereof for controlling a size of said material to be dried being delivered to said dryer body, wherein said propeller is configured to have an output port laterally arranged relative to a length of the propeller, and said propeller is connected to said motor and said gearbox for driving the propeller and changing said rotational speed of the propeller at which said material to be dried is propelled, compressed and discharged in said paste form;
• (3) dispersing and suspending said material to be dried inside said dryer body by hot air coming out from said bottom of said dryer, wherein the hot air is extracted from said dryer body by said air blower back to said dryer body;
• (4) drying the suspended material to be dried by microwaves generated from said at least one microwave vibration head mounted inside said dryer body;
• (5) discharging said dried material from a material discharge port on a top of said dryer body in said form of particles or powders.