Study Of Microwave Deicing Efficiency On Road

Ice on the road does harm to the safety of traffic and people.To clear the ice on the roadeffectively,in particular on highways,bridges,airport runways and other important facilities thishas been a major concern by worldwide countries in the high altitudes.Ice and snow disasterhave occurred in the southern most regions of our country in 2008,exposing what a means ofdeicing is much need take out to research.Microwave deicing is to be considered as a new typeof environmentally deicing method.The paper researched the technology of microwave deicingby theory and experimentation.The main conclusions are as follows:1.Based on the theory of microwave heating CST,MATLAB and ANSYS software wereused to achieve the simulation of microwave deicing by three-dimensional model of microwaveheating.The results of simulation were the same to all experimental results.2.The simulation results showed the reason for low efficiencies being that the road iceabsorbed sources of energy limited to asphalt concrete 0-30mm depth.Heating asphalt concreteusing 2.45GHz is nearly 120mm in depth.Asphalt concrete absorbs microwaves and produces alarge amount of heat,but not all the heat is used to promote the melting of the ice at the roadjunctions.A considerable portion of the heat was used to heat the road to a given depth.At thetime when the combination of ice and the pavement temperatures reaches 0℃it was proposed asthe indicators of microwave deicing efficiency.The stop time of microwave heating of deicing isgiven too.3.The frequencies,electric field intensity of microwaves,the heating modes of microwavesand distances between road and waveguide outlet were researched by simulation andexperimentation.The results showed that the microwave frequencies have the largest impact onthe deicing efficiencies.Improving the microwave frequencies can improve the efficiency ofmicrowave deicing.Compared with 2.45GHz,5.8GHz improves the efficiency of microwavedeicing 3-5 times.Intermittent heating effects are better than the continued deicing methods.When using intermittent heating,the time interval of 10 seconds of heating is the best.Thedeicing effect is best at the end of a 30 second heating cycle after the heating.With the samecircumstances,improving the microwave deicing efficiency is not practical to change themicrowave electric field strength.The deicing efficiency is highest when the distance between road and waveguide outlet is 50mm.4.The road material affecting the deicing efficiency was researched.The simulation andexperimental results showed that the concrete deicing efficiency is 3-4 times that of asphaltconcrete.The simulation results also showed that the magnetic material can increase theefficiency of the microwave deicing.Compared to ordinary asphalt concrete pavement,asphaltconcrete appended with magnetite material at the ratio of 40% can improve the deicing efficiencyup to 7 times.With the use of magnetic material overlays the efficiency improves by as much as 5times.5.The simulation results showed that when 5.8GHz heating of asphalt concrete appendedwith magnetite material at the ratio of 1:4,the microwave deicing efficiency can achieveengineering applications.6.The environmental temperature,thickness of ice and impurity content of ice were studiedby simulation and experiment.The results showed that the deicing efficiency at -5℃is about 4.7times than at -20℃.The impurities of soil type existed at the bottom of ice enhanced themicrowave deicing efficiency.The deicing efficiency of the sample with the impurities of soiltype existing at the bottom of the ice is 2-3 times of the sample no impurities.The thickness ofice has a small impact on deicing efficiencies which reflects the advantage of microwaves toremove thick ice.