Analyzing Heat Efficiency Of Drying Drum Used In Asphalt Mixing Plant And Construction Optimum Design

Drying Technology has been applied widely in various industries and fields.Dry is also one of the largest energy-consumin and the most polluting in industry production. Therefore scientific and technical workers are paying more attention to drying equipment of saving energy and environment protection in today's society.This paper studies a kind of the most common drying equipment—rotary-drum dryer.It was widely applied in asphalt mixing plant, was also called drying drum.Drying drum is a critical part of asphalt mixing plant, it is also one of the key equipments in Pavement construction. Its main purpose is to dry asphalt mixture of moisture and heated to construction specified temperature.The burners produce the burning flame and heat in pavement construction. It usually used counter-current heating and the exhaust gas is vented to atmosphere through dust removal. The energy consumption and pollution emissions is a problem that is exigent to be solved in modern pavement construction industry.This paper analyzes the development situation of domestic and foreign drying drum reference for the related technologies at home and abroad using the asphalt mixing plant of J2000 on the market as the research subject. This paper is based on theoretical analysis and numerical simulation and analyzed the influence factors of the heat efficiency. Finally according to the theoretical analysis and the numerical simulation resultredesign and optimized the structure of the drying drum.this paper can provide some guidance to study the rotary drying drumraise the heat efficiency saving energy and reducing emissions.This paper reference for drying drum of the asphalt mixing plant of J2000 on the market as the research subject.Analysis the particle movement and building the mathematical model of the drying drum.Then calculating the holding capacity of stirred material blade and mean residence time of aggregate particles in drying drum. Utilizing the Flunetone of Computational Fluid Dynamics(CFD) softwares simulate the fluid flow and heat transfer within the drying drum. Furthermore, make the industrial test to verify the feasibility of numerical simulation for drying drum. According to the flow field of the change rulesuch as temperature flow fieldpressure flow field and speed flow fieldit can guide design of stirred material blades. On that basis analyzed the influence factors of the heat efficiency and confirm various parameters reasonable value range of drying drum.Finally redesign and optimized the structure of the drying drum.