Analysis Of The Flowing Mechanism And Numerical Simulation Of Carbon Black In The Dense Phase Pneumatic Conveying System

Pneumatic conveying is a kind of method which through compressed gas as its power source and transporting the bulk material or powder to the destination along the closed pipe by the air or other inert gas. Because of the process of pneumatic conveying is carried out in a closed pipe, it has many advantages, such as no pollution, low energy consumption, transmission stability, security and so on. Therefore, pneumatic conveying is widely used in the process of bulk material conveying in various industries.This paper reviews the development of pneumatic conveying at home and abroad, and summarizes the used pneumatic conveying technology and its development trend. Due to the special delivery requirements of the carbon black commonly used in the rubber industry, the research direction of this paper is mainly focus on the deep discussion of flow mechanism of the carbon black in the dense phase conveying. This paper presents a mathematical and physical model of dense phase pneumatic conveying mechanism, and combines the forces of solid particles in the pipeline as well as the interaction of the gas-solid to make an experiment and simulation, then from which to draw the analysis and verification of the flow mechanism of carbon black dense phase pneumatic conveying.In this paper, the author designed a carbon black dense phase pneumatic conveying system to test different pneumatic conveying parameters. From the analysis of the experimental results, the author draws the diagram of the transport characteristics of pneumatic conveying in different conveying conditions, discovers the law of sends tank pressure, pipeline pressure and other parameters of conveyor and identifies the best delivery process parameters to meet throughput. Also, the result of this experiment shows the way to improve the transmission efficiency, reduce the consumption of compressed air and minimize the crushing rate carbon black. Through the study of the transport mechanism can identify the factors that affecting the stability, high efficiency, environmental protection, energy conservation, safety of pneumatic conveying. Through using compressed air energy-saving technology to optimize the carbon black pneumatic conveying system to achieve the stable operation of the pneumatic conveying system with low energy consumption.Based on the flow mechanism of carbon black dense phase pneumatic conveying system, the author establishes a kind of conveying mathematical and physical model and uses the Fluent software to make simulation and analysis. Firstly, through the simulation analysis of the geometric parameters of the pipeline, to conclude the impact of pressure and pipeline flow state under the different circumstances of pipe diameter, bending diameter ratio and the arrangement of bend, and then put forward the optimal program of piping layout. Secondly, through the simulation analysis of the transport process parameters, to obtain the flow characteristics of the carbon black particles in the pipeline at the different cases of transmission speed and throughput as well as the best gas speed in the case of constant throughput. Finally, based on the combination of the best pipeline geometry parameters and optimal delivery process parameters, make a simulation experiment of carbon black dense phase pneumatic conveying to study the flowing state of carbon black according to the force condition of the carbon black in the pipeline and analyze the impact of the different elbow arrangement of the entire transportation process.This paper conducted a comprehensive study of carbon black in the flow mechanism of the dense phase pneumatic conveying system by the methods of the theoretical studies, experimental analysis and numerical simulation. The research results of this paper has a very high application value on the design and application of carbon black pneumatic conveying system.