paper

Sensitivity Study of Rotary Cement Kiln Using Dynamic Simulation

 Mohammad T. Sadeghi and Shahrokh Shahhosaini

  Abstract

  Dynamic simulation of rotary cement kiln is a useful tool to study its behavior in different operating conditions. In this work a generalized cement kiln model, which is a highly non-linear distributed parameter system, was developed. Partial Differential Equations (PDE’s) were discretized in spatial direction, applying Orthogonal Collocation (OC) technique. The model comprises differential equations as well as non-linear algebraic constraints. The NIMBUS dynamic simulation package (Newell and Cameron 1991) [1] was used to solve the resulting differential and algebraic equations (DAE’s). The DAE’s were solved simultaneously via sparse and dense numerical methods. Dynamic responses of the model to step changes in some manipulated variables were studied to predict open loop behavior of the system. The step changes include increase or decrease in gas and solid temperatures as well as solid and gas velocities. Sensitivity study indicated that the model successfully predicted qualitative behavior of an actual cement kiln.