Design And Analysis Optimization Of Dust Removal System For Asphalt Hot Recycled Pavement Maintenance Vehicle

Asphalt hot regeneration pavement maintenance truck is an effective equipment for asphalt pavement maintenance and repair,heating and recycling of waste asphalt,achieving the mix mixing and regeneration of old asphalt.Waste asphalt mixture in the process of heating and melting will form a large number of organic fumes,coupled with the dust caused by mixing,making the asphalt hot regeneration of road maintenance vehicles generated by the complex composition of the exhaust gas,a single means of purification is difficult to remove.The unpurified exhaust gas contains a large amount of greenhouse gases and carcinogenic substances,which is extremely damaging to the atmosphere and runs counter to the national "double carbon" strategy.Therefore,the design of a set of safe,effective,simple and reliable vehicle dust removal system to improve the performance of equipment,reduce atmospheric pollution,to protect the lives and health of residents is of great significance and practical value.This thesis proposes a multi-stage combined treatment of asphalt hot recycled pavement maintenance vehicle dust removal system structure design method,the establishment of cyclone-spray-adsorption multi-stage tandem exhaust gas purification system,analysis of dust removal characteristics of different structural segments and the implementation effect,the main research content is summarized as follows:1To clarified the main constituents of dust-containing gas,the chemical composition of exhaust gas fumes,determined the technical route of high-efficiency dust removal system,and proposed a multi-stage tandem exhaust gas purification structure scheme of cyclone-spray-adsorption,and designed the main performance parameters and structural dimensions of the device according to the working conditions and actual production requirements.Further,the finite element analysis model of the dust removal system is established,and the frequencies,strains and modal vibrations of the system structure under each order of modalities are evaluated based on the finite element method,and the analysis identifies more weak structural links,and the simulation results guide the optimization of the structure to improve the inherent frequencies and strains under each order of modalities.2For the cyclone dust collector section with dust-gas separation function,the internal flow field of the cyclone section of the dust collector system was analyzed by CFD numerical simulation method.The turbulence intensity increases,which increases the turbulence dissipation and makes the pressure loss increase slightly.In order to maximize the dust removal efficiency and weaken the pressure loss at the same time,an inverse venturi cyclone dust collector with a scrambling column was designed,which can effectively slow down the local turbulence and the rising axial velocity of the central cyclone inside the device and improve the performance of the device.3Established a fluid-solid-thermal coupling model of dust collector system spraying device,and studied the heat exchange between airflow and partition under the action of multi-physical fields.It was found that the partitions with variable diameter apertures have significant effects on airflow diversion,optimizing flow distribution and avoiding local heat concentration.4According to the working environment of the dust removal system,two types of applicable flanges were initially screened,namely trapezoidal sealing surface flange and convex sealing surface flange.By comparing the maximum deformation of the two flanges under the temperature field load and bolt preload,the selection and application of flange parts for dust removal system are guided.