Numerical simulation study on calcination process of cement triple-spouting precalciner

Abstract

To study the calcination process in a precalciner and improve calcination effect, the 4 500 t/d TTF precalciner in a domestic cement company is numerically modeled by Fluent. By selecting the standard k-ε model, discrete phase model and component transfer model, the flow field and temperature field are simulated, based on which, the pulverized coal combustion process and the effects of cement raw meal angle, tertiary air velocity and tertiary air temperature on calcination process are analyzed. The results show that the incidence angle of raw meal has great influence on the decomposition rate. When the tertiary air velocity is higher, the decomposition rate of raw meal and the burning rate of coke are also higher. Increase in tertiary air temperature causes insufficient combustion air and reduces coke reactivity, thereby reduces combustion rate. By optimizing the three parameters, the decomposition rate of CaCO3 and the burning rate of coke can reach 90.3% and 88.0%, respectively. The research on the numerical simulation of cement precalciner calcination process and its application in practical engineering projects can provide theoretical reference for optimizing cement production conditions, and has great practical significance for the cement industry and its coordinated development with resources and environment.

Keywords

• industrial boiler
• TTF precalciner
• pulverized coal combustion
• raw meal decomposition
• optimization
• numerical simulation