An experimental approach to thermochemical conversion of a fuel particle in a fluidized bed

Modeling and experimental investigation on the fuel particle heat-up and devolatilization behavior in a fluidized bed

“…9 shows that the hydrogen content in char decreases with temperature. This trend is consistent with the results of some other studies: whether coal or biomass, more volatiles are released at higher temperature [22,35]. The experimental results published by Sadhukhan et al [3] are also used to validate the devolatilization model developed in this paper.…”

“…The fuel devolatilization characteristics are affected by many factors, including particle size [3,16,23,[30][31][32][33] and shape [34], environmental temperature [2,3,9,16,17,19,21,22,30,[34][35][36], heating rate [17,20,23,32], fuel type(rank) [2,21,31,34], atmosphere [1,31,32,36], etc. Tian et al [23] and Yan et al [17] both argued that the temperature and fuel particle size are the more important parameters compared to others.…”

“…For example, larger fuel particles experience lower heating rate and uneven heating [16,30], resulting in longer devolatilization time [30,34] and different yields of volatiles [3,23,33]. Further, with the higher environment/surrounding temperature, the devolatilization time is shorter [3,30,34] and the volatiles yield is higher [3,21,22,35,37]. In addition, the composition of volatiles, as well as the distribution of fuel-N into volatile-N and char-N, may also change [2,17,19,21,31].…”

Cluster Identification by a k-means Algorithm-Assisted Imaging Method in a Laboratory-Scale Circulating Fluidized Bed

“…A gas–solid circulating fluidized bed (CFB) system, as a typical chemical reactor, has been widely applied into industrial processes such as oil catalytic cracking, Fischer–Tropsch synthesis, and coal combustion. , The most valuable area of potential applications for CFB is in coal gasification and biomass gasification for power generation, chemical production, and synthesis gas. − Recently, the CFB technology is a promising approach that allows effective gas–solid contact for emission control and chemical looping processes for carbon capture and utilization. − Based on the gas–solid flow directions, operations of a CFB reactor can be achieved either in a riser − where both the gas and solid flow upward counter to the gravity or in a downer , where both the gas and solid flow downward concurrent with the gravity. Normally, most of the reactions like the catalytic cracking and fuel combustion processes take place in the riser reactor since it provides good gas–solid contact, large throughput, proper residence time of the reaction, and flexible operating ranges.…”

Modeling of the axial distributions of volatile species in a circulating fluidized bed boiler

“…Based on it, the simulation in one 135 MWe CFB boiler burning bituminous coal is conducted. Besides, the fuel devolatilization (Park and Jang, 2012;Ruben Sudhakar and Kolar, 2011;Salmasi et al, 2018a) and the CFB mass balance (Yang et al, 2004;Leckner, 2017;Yue et al, 2017) are both significantly affected by temperature and particle size. Other than the analysis of the axial distributions of volatile species under normal condition, the effects of feeding coal size and furnace temperature are also discussed.…”