Presently, grate-firing and fluidized-bed combustion technologies are the main competing technology options for generation of heat and power from various types of biomass. Grate-firing systems (also termed stokers), basically characterized by rather low investment and operational costs, provide some important advantages, such as (i) the ability to handle biomass fuels with very high moisture content and/or large particle size, (ii) the wide range of system load, and (iii) the reduced fly ash load in flue gas with corresponding remediation of ash-related problems (slagging and fouling) [1] and [2]. However, due to some specific advantages, such as fuel flexibility, excellent solid–gas mixing, temperature homogeneity and effective emission control, the fluidized-bed combustion technology seems to be the most efficient and environmentally friendly technology for conversion of energy from various biomass fuels, particularly, from agricultural residues sustainably produced on a large scale [1], [3], [4] and [5]. As revealed by a number of research studies and reviews, the combustion efficiency and emission performance of a fluidized-bed combustion system (combustor or boiler furnace) firing biomass are influenced by fuel properties, design features and operating conditions of the combustion system used [1], [6], [7] and [8].