In addition, a long time and a large number of microwaves, however, microwave drying of wood consumes a large amount of electricity, equipment investment is higher, non-radiation makes the wood internal temperature faster, and produces a higher steam pressure suitable for large-scale drying of wet wood, and suitable for drying a small amount of half of the wood structure damage, resulting in wood mechanical strength. Two drying of thousand lumber to supplement conventional drying. We must decline, or even crack, drying wood will be due to local overheating to avoid shortcomings, skillfully use of microwave drying, I believe that the role of wave technology will occur carbonization phenomenon. Therefore, the modern measurement and control technology and microwave wood industry have a wide range of application prospects. The connection of power output is very important for improving drying process.
Problems in research methods
At present, most of the researches on wood microwave drying are based on one-sided, small-scale experiments, and can not form a comprehensive understanding of the drying process and results. Therefore, it is necessary to establish a method system to study the dielectric properties of wood under microwave electromagnetic field from the microscopic aspect and to study the mass and heat transfer phenomena from the macroscopic aspect.
Specifically, starting from the change of dielectric properties of wood, the parameters of microwave drying process including microwave radiation time, power density, wood initial moisture content, thickness, energy consumption and so on were studied. On this basis, the test scale was expanded to evaluate the wood quality after drying. Ask different tree species, the microwave drying power, the highest temperature and drying time are different, even if the same tree species, due to different parts of the structure or moisture content, microwave drying process is also different.
At present, most of the researches on wood microwave drying are based on one-sided, small-scale experiments, and can not form a comprehensive understanding of the drying process and results. Therefore, it is necessary to establish a method system to study the dielectric properties of wood under microwave electromagnetic field from the microscopic aspect and to study the mass and heat transfer phenomena from the macroscopic aspect.
Specifically, starting from the change of dielectric properties of wood, the parameters of microwave drying process including microwave radiation time, power density, wood initial moisture content, thickness, energy consumption and so on were studied. On this basis, the test scale was expanded to evaluate the wood quality after drying. Ask different tree species, the microwave drying power, the highest temperature and drying time are different, even if the same tree species, due to different parts of the structure or moisture content, microwave drying process is also different.
没有评论:
发表评论