The book "Circulating Fluidized Bed Boiler Technology" offers a comprehensive analysis of the heat transfer processes that occur during combustion in circulating fluidized bed (CFB) boilers. It addresses the development of a model for the operation of CFB boilers based on empirical correlations to determine the heat transfer coefficients in various areas of the furnace. This model is applicable for both design and off-design conditions. Additionally, it examines the effects of fuel moisture and boiler load on the operation of the boiler. The book provides an in-depth review of the fuel properties of typical biomass classes and discusses various utilization schemes, particularly in relation to CFB boilers. It also addresses potential negative impacts of biomass utilization.