Distributed state estimation of FCCU riser temperature

The temperature of riser reactor plays an important role in the operation and control of fluid catalytic cracking unit (FCCU). However, the FCCU riser only has limit temperature sensors. In this paper, a distributed state observer strategy is proposed to estimate temperature distribution of the whole riser. Based on moving horizon estimation (MHE), this paper presents a simplified MHE scheme for differential-algebraic systems that is applied to each observer that are combined together to form a large distributed state observer. The simulation results show that the distributed state observer works well and is able to estimation the temperature distribution.