Abstract
Fluidized bed boilers are nowadays widely used in Finnish process industry. Although the combustion process behaves quite stable in normal operation conditions some problems might exist when using inhomogenous fuels and during load changes of the process.The aim of the study was to improve the behaviour of the fluidized bed combustion process by means of automation. Some developments can be achieved such as reduction of sulfur and nitrogen oxide emissions, improvement of boiler efficiency and control properties in multifuel use as well as reduction of boiler power demand. Several process experiments concerning the static and dynamic behaviour of peat and coal fired boilers have been done. In the process experiments the main interest was to find out the effects of different inputs on the combustion temperatures, nitrogen and sulfur oxide emissions, boiler power demand and boiler efficiency. Possibilities to optimize combustion conditions for sulfur capture and reduction of nitrogen oxide emissions have been investigated, too. The control strategies of the combustion process were also widely studied.The design of control systems was based on the dynamic system equations.
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