Font Size: a A A

Traditional Chinese Medicine Turbulence Mill Classifier Device Structure Optimization

Posted on:2012-07-16Degree:MasterType:Thesis
Country:ChinaCandidate:Z L LuFull Text:PDF
GTID:2131330335467032Subject:Mechanical Manufacturing and Automation
Abstract/Summary:PDF Full Text Request
Superfine grinding grading equipment is dry air classification, widely used material, on-metallic minerals, chemical, pharmaceutical and other production areas, production of traditional Chinese medicine ultra-fine powder is one of its important applications. Chinese medicinal materials stem rod mill crushed by superfine prone to agglomeration, the existing classifier structure can not satisfy the requirements of ultra-fine powder grading, the classification performance are subject to certain restrictions. Improve the classifier structure and improve the classification effect is a research focus.This article compares the analysis of domestic and foreign research and development status of ultra-fine powder classification on the basis of ultra-fine grinding grade equipment for the turbulence–turbo air classifier principle and structural characteristics, the use of computational fluid dynamics (CFD) method, numerical simulation of turbo air classifier within gas-solid flow field, optimizing the air inlet angle of the second classifier and evaluate its classification performance. The research work and results are as follows:(1) The turbo air classifier and structural characteristics of the working principle, according to Newton's classification efficiency of secondary air inlet on the classification performance, the results showed that: secondary air inlet angle settings of Classifier have an important influence on classification performance.(2) In order to determine the best angle of the secondary air inlet about classifier, to designed the second air inlet angles of 15°, 30°, 45°, establishment of the classifier secondary air inlet include the 0°,the 4 simplified of state, using the software GAMBIT meshing their geometric model ,for the pre-treatment numerical simulations .(3) Using Computational Fluid Dynamics software FLUENT turbulent model and multiphase model of Mixture computational classifier flow field. Set the same boundary conditions of the four geometric models, and the solving control parameters, then numerical simulation of the flow field. Determine the optimal design of the program that the angle of secondary air inlet is 30°, which is the most reasonable.(4) Change the classification wheel speed, the speed of the classification wheel numerical simulation of the flow field is obtained when the grading machine running speed of the flow field vector, and to allow analysis and comparison, which play a grading machine to determine the optimal performance of the speed. Given the pressure contours coarse powder and ultra-fine powder exports, simulated powder particles in the best speed trajectory and capture a number of particle trajectories. Evaluate and compare the secondary air inlet before and after optimization of the classification performance.By numerical simulation results showed that: using the numerical simulation of the grading machine to simulate the flow field, you can optimize the structure of the grading and classification of machine performance improvements such as problem solving, to provide an effective theoretical basis.
Keywords/Search Tags:Chinese medicine, Ultra-fine grinding, classifier, gas-solid two phase flow, CFD
PDF Full Text Request
Related items