Control Strategies for Fluidized Bed Combustors

This study is a summary of a half-year field trip on the field of FBC technology. The focus was on the operation and control solutions to give inspiration for further developments on the pilot scale plant at Budapest University of Technology and Economics (BUTE. The main steps were to getting closer to the technology, check the operation methods in industrial scale plants and find a section in the control solutions what I could reinforce on BUTE's test rig. Chapter 1 and 2 summarize in nutshell the knowledge that could be found in the literature about the technology, supplemented with the experiences of power plant visits. Comparison of two test rigs (at BUTE and VTT) can be find in Chapter 3. Chapter 4 contains some results of the research work on the interacting fuel- and secondary air inlet control loops. A typical cross connection was observed and a decoupling controller was designed to maintain bed temperature and flue gas oxygen content independently.