Experimental research on agglomeration in straw-fired fluidized beds

Bed agglomeration characteristics of rice straw combustion in a vortexing fluidized-bed combustor

“…Bed temperature is the key factor for defluidization. The most convenient and effective method of preventing defluidization is to keep the bed temperature from rising above the melting point of the eutectic compositions, which prevents the melting phenomenon (Skrifvars et al, 2005;Yu et al, 2011). As the bed temperature decreases, CO emission also increases to much higher levels than the norms of the regulation (Bahillo et al, 2004;Baron et al, 2002).…”

“…Superficial gas velocity directly affects the quantity of bottom ash and the heat transfer of burning char (Yu et al, 2011). Defluidization time increases with superficial gas velocity, but the effect of superficial gas velocity on defluidization is minimal at higher bed temperatures (Liu et al, 2010).…”

Effect of bed agglomeration by mineral component with different coal types

“…There are several major factors in the bed agglomeration phenomenon such as particle size, feeding mode, reaction environment (oxidation/reduction), temperature, fluidization velocity, and contents of alkaline earth and alkali mineral [7]. Geldart [8] classified the particle groups into four types, A, B, C, and D, based on their fluidization behavior and mapped the particle types by size and density.…”

Recent Development of Corrosion Factors and Coating Applications in Biomass Firing Plants

“…Biomass fuels generally exist in three ways, solid fuels, liquid fuels, and gaseous fuels, such as wood products, biodiesel, and gases produced by the change of biomass. Compared with coal burning, these biomasses contain a higher content of inorganic impurities, such as potassium, chlorine, and sulfur, which will lead to problems, such as slagging in the boiler, deposition on the heating surface, chlorine corrosion on the heating surface at low temperature, and high-temperature corrosion of the superheated tube in the direct combustion process [8][9][10][11]. As shown in Figure 1, with the gradual decrease of temperature, metal chlorides in the flue gas are deposited on the wall of the superheater pipe [12].…”