Design, Construction, and Operation of a Transported Fluid Bed Process Development Unit for Biomass Fast Pyrolysis:  Effect of Pyrolysis Temperature

Abstract

The objective of this paper is to investigate biomass fast pyrolysis process in a novel once-through transported fluid bed process development unit. The main emphasis was given to the design and operation of this unit, which is made of several vessel modules. The main part of the unit is a specially designed mixing zone, where the solid heat carrier mixes with the biomass feed. The unit can process up to 20 g/min biomass and can circulate up to 300 g/min solid. Experiments showed that the unit could run effectively, with satisfactory stability and mass balances (92−96 wt % on biomass), under a wide range of experimental conditions. The yield of the raw total liquid product was up to 78 wt % on biomass basis. The effect of pyrolysis temperature on product yields is also presented in this paper: the temperature of 500 °C was found to be an optimum temperature for the maximization of the liquid product yields using a wood-based biomass.

Catalytic pyrolysis of liquorice (Glycyrrhiza glabra L.) in a fixed-bed reactor: Effects of pyrolysis parameters on product yields and character

“…Phenols and derivatives such as 2,6-dimethoxy phenol and guaiacol, the majority of the compounds in biooils, are obviously the primary products of degradation of lignin (280-500 • C) during pyrolysis [70]. In accordance with the previous studies reported in literature [45,[71][72][73][74] most of the identified compounds of bio-oils are phenolics and their derivatives formed obviously from decomposition of lignin in the raw material. They consist of phenols, methoxy phenols, alkyl phenols and guaiacol.…”

Catalytic pyrolysis of woody biomass

“…Lappas et al also designed and constructed a transported fluid bed process unit for fast pyrolysis of biomass [29]. The pyrolysis capacity was 20 g/min of biomass.…”

“…The pyrolysis capacity was 20 g/min of biomass. The authors investigated the influence of temperature and found that 500°C was the optimal temperature for liquid production using woody biomass as a raw material and liquid yields of up to 78 wt% were achieved [29]. Furthermore, the same reactor set-up for investigating catalytic pyrolysis of beech wood over a fluidized catalytic cracking (FCC) catalyst was applied [18].…”

Influence of Secondary Reactions on the Heat of Pyrolysis of Biomass

“…The upsurge of interest in the simulation and optimization of reactors for thermochemical processes requires appropriate models that integrate different operating conditions and different feedstocks, helping to achieve a better understanding of the reactions in the corresponding processes. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] The heat of reaction has a significant influence on thermal conversion routes, and understanding the effect of the reaction heat is important in the modeling of thermochemical processes. However, the thermal effects of pyrolysis reactions have been found to vary widely, ranging from exothermic to endothermic under different operating conditions.…”