Optimization Control of Thermal Efficiency for Cement Raw Meal Pre-Decomposition Based on Two-Layer Structure Model Predictive Control

Abstract

A two-layer structure model predictive control (MPC) for the low thermal efficiency of cement raw material pre-decomposition is proposed. In the upper layer, an outlet temperature of the precalciner automatic setting scheme is formulated with craft constraints by taking advantage of the energy flow and thermal energy conversion models. In the lower layer, the stable control of the precalciner is achieved using a model predictive control algorithm. Finally, extensive simulation results verify the proposed two-layer MPC approach with excellent performance in energy saving and consumption reduction of raw meal predecomposition link.INDEX TERMS Two-layer structure model predictive control, precalciner, energy flow model, thermal energy conversion model.

Alternative Fuel Substitution Improvements in Low NOx In-Line Calciners

“…The purple box provides the actual setpoint of calciner fuel. The unique advantage of this method that contributes to its success is that operators can type in a new setpoint at any time without deactivating the automatic controller if they see the need to make an adjustment [74]. An example might be that the operator just increased the kiln feed rate and wants to be proactive in adding some fuel to compensate for the expected temperature drop [75].…”