Heat Exchanging Performance Simulation And Design Research On Heat Conduction Oil Heating Asphalt Equipment Of Asphalt Distributor

At present, The Enterprise of our country expressway has been in the period thatroad construction as important as road maintance. By New material, new process andnew technology being introducing into China, higher requirement on asphalt distributorperformance has been put forward. Heating equipment is one of the key equipment ofAsphalt distributor, which will directly influence spraying quality and pavingperformance. So the heating equipment that can’t meet the higher requirement will beeliminated by the market.At first, this paper summarizes the development of asphalt heating technology at homeand abroad, then compares the advantages and disadvantages of different heating methods ofasphalt, determine to select the heat conduction oil indirect heating mode which is widelyused at present. Then on the basis of the theory of heat, this paper makes calculation aboutbuilt-in double U tube heat conduction oil heating device. For this heating device, this paperuses PROE to design geometric model and ANSYS Workbench to simulate the heat transferprocess. The numerical simulation is based on steady thermal analysis for the process ofheat-exchange. Asphalt is laminar flow model and heat conduction oil is the standard k-epsilon calculation model and wall function method. For coupled heat transfer analysis, putthe Velocity-inlet, out–flow and the solid wall boundary as boundary conditions. Numericalsimulation results show that the heat transfer conditions meet the design requirements. Finally,by the numerical simulation the paper analyzes effects which the coil structure, coil spacingand heat conduction oil, asphalt flow velocity influence on heating device and gets thefollowing results: different coil structure form and value change on heating coil spacing havean impact on heat transfer effect, but asphalt tank space is limited and the heat transfer area isnot large, which has a little influence on temperature field distribution and heat transfer effect;Cycle of heating asphalt dynamic in thermal efficiency is superior to the natural way of heattransfer; The changes of the heat conduction oil and asphalt flow rate will influence the heattransfer coefficient K, but considering its influence on pressure drop Δ P, by appropriatelyimproving the heat conduction oil flow rate the heat-exchange effect will be better. The aboveanalysis has a certain reference on the asphalt distributor heating device for the future design.