Operation control of circulating fluidized bed boilers

• Published in: International journal of energy research Vol. 20; no. 10; pp. 839 - 851
• Main Authors: Gierse, Martin, Leckner, Bo
• Format: Journal Article
• Language: English
• Published: New York Wiley Subscription Services, Inc., A Wiley Company 01.10.1996; Wiley
• Subjects: Applied sciences; bed temperature; Boiler circulation; Boiler control; boiler operation control; Boilers; circulating fluidized bed boilers; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Flue gases; heat balance model; Heat flux; Mass transfer; Mathematical models; Parameter estimation; Q1; Temperature distribution; Boiler; Experimental test; Sensitivity analysis; Process control; Circulating fluidized bed combustion; Models; Mass flow; Heat transfer
• ISSN: 0363-907X; 1099-114X; 1099-114X
• DOI: 10.1002/(SICI)1099-114X(199610)20:10<839::AID-ER199>3.0.CO;2-F

The heat balance of different circulating fluidized bed boiler designs is investigated for variations in input parameters, such as specific flue‐gas amount and ash content of the fuel. A simple model and a corresponding diagram are developed to describe the boiler behaviour when conditions deviate from the nominal ones. The model shows how the furnace temperature is influenced in different ways in different boiler designs by changes of furnace heat transfer and of the mass flow of particles and flue gases. The model results are verified by measurements in one type of boiler. Finally, it is shown how the desired stable furnace temperature and stable heat flux distribution are in conflict during variations of the input parameters. As a consequence, a two‐dimensional boiler control strategy is suggested.