Microwave drying characteristics and analysis of wood
Substance in the microwave field of the microwave from various directions by the role of penetrating into the material inside the microwave function, the microwave makes this penetrating microwave drying of substances can be dry material the same table, almost no temperature gradient, and thus microwave technology used in wood, herbs, pills, powders puffing drying and chemical drying has a unique advantage of being able to solve the conventional drying methods can not solve problems and achieve good drying effect than the conventional method. Microwave drying of wood has the following five aspects of advantages:
(1) Fast practice shows, from 8mm to 50mm thick plate of square material, water from 35% to 40% is dried to about 20%, the drying time is about 10 ~ 26min, the speed of the conventional steam drying process 20 ~ 30 times.
(2) high efficiency microwave penetration makes the material in the microwave field directly affected by microwave irradiation, thus drying efficiency. Through the various species of wood drying test, in its specifications under essentially the same conditions, the following results:
① various species of wood dehydration rates are lkg / kW • h around or slightly over;
② the same thickness of the wood under the same specification, dehydration rate of about lkg / kW • h;
③ the same direction along the fiber length of the type of wood, drying effects are significantly different, the fiber length is short for water is high, on the contrary, the rate for water.
(3) of good quality because the microwave heating with a strong permeability and other characteristics, in the drying process of wood, wood between the exterior, the shrinkage of the fiber ends and the intermediate relatively consistent, the cracking and deformation, microwave drying of wood efficiency can be increased at least 5%.
(4) Microwave drying of wood at the same time, can kill within the wood borers and various bacteria.
(5) Microwave drying of wood from natural conditions, without taking up much space. Microwave drying equipment features:
(A) products from multiple independent small power microwave source combination.
(2) each separate electromagnetic and microwave sources without large water system, reducing manufacturing costs.
(3) Multi-chamber and multi-combination microwave source, the field intensity distribution of working segment, to ensure a good processing quality.
(4) Since the power dispersed, the outlet end of the field is not, the leakage power with respect to the field strength is easy to control.
(5) multi-multi-cavity microwave source structure, product repairs and parts replacement is simple and easy, even in individual microwave source does not work in the case, the machine still running, avoiding the downtime caused Stop loss.
(6) of the magnetron life of up to 5000-8000 hours.
(7) cavity and shell made of stainless steel, long-term use, simply replace the small electrical components, maintenance, maintenance costs low.

 

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