Design And Thermal Analysis Of Heating System Of Asphalt Distributor

As China’s road construction requirements become higher and higher,the heating efficiency of the asphalt and the insulation performance of the tank directly affect its work efficiency.Only when the asphalt reaches the set temperature can the sprinkling operation and uniform sprinkling be carried out,thus improving the sprinkling quality and the performance of the pavement.Based on the asphalt spreader produced by a company,this paper adopts experimental data and theoretical study to analyze,and uses Creo 6.0 3D modeling and ANSYS Workbench 14.5 to conduct numerical simulation of its heat transfer process and finally conducts experimental results.The main research contents are as follows:(1)This paper introduces the research status of intelligent asphalt spreader at home and abroad,the development trend of asphalt spreader in the future,as well as the structure and working principle of the asphalt spreader.According to the relevant theories of heat transfer and fluid thermodynamics,the paper collects the physical parameters,formulates the test scheme for the original asphalt distributor,carries out the test,and designs and analyzes the main structure and components of the internal furnace type thermal oil heating system by combining the test data and CFD numerical simulation results.(2)Creo 6.0 was used for 3D modeling,and ANSYS Workbench 14.5 was used to simulate the heat transfer process before and after the design.This is a transient simulation analysis of the entire process of heat transfer between asphalt and heat transfer oil.The heating system after the simulation analysis is verified experimentally.The test results show that it meets the design requirements.(3)Simulation analysis was performed to calculate the effect of three spacings of upper and lower row coils(220mm,320 mm,420mm)and the flow rate of hot and cold fluid on the heat transfer efficiency of the heating system.The results of the simulation analysis are as follows: among the three spacings of the upper and lower row coils,the heat transfer efficiency of the heating system is best at 420 mm.The heat transfer efficiency of forced convection heat transfer of asphalt is higher than that of natural convection heat transfer.The values of heat transfer coefficient(K),Nusser number(Nu)and pressure dropΔ P are increasing with the flow rate of hot and cold fluids.Considering the increment of pressure drop Δ P,the heat transfer efficiency is improved by increasing the flow rate of heat transfer fluid.This is a reference value for the subsequent design analysis of the heating system of the intelligent asphalt spreader.