Pyrolysis of agricultural waste biomass towards production of gas fuel and high-quality char: Experimental and numerical investigations

Valorization of Vine Prunings by Slow Pyrolysis in a Fixed-Bed Reactor

“…CO 2 from a gas tank (7) was fed into the pyrolysis column through a pipe (8), upflowed through the fixed bed material, and was discharged through a collecting pipe (9) along with the volatiles produced during the pyrolysis. The mixture of non-condensable gases and vapour was cooled in a Liebig condenser (10), resulting in a pyrolytic liquid and non-condensable gases. Evacuation and condensation of volatile compounds were performed in the presence of a laboratory vacuum system (11).…”

“…Due to its low cost, abundance, and carbon neutrality, residual lignocellulosic biomass represents an attractive renewable resource for producing biofuels and chemicals [1,6]. Lignocellulosic biomass, which is mainly composed of polysaccharides [hemicellulose (15-40%) and cellulose (25-50%)] and aromatic polymers [lignin (10-40%)], can be valorized using different thermo-chemical technologies, e.g., combustion, pyrolysis, gasification, hydrothermal liquefaction, or biochemical routes, including fermentation and anaerobic digestion [3][4][5][6][7][8][9][10][11][12]. Among them, pyrolysis is a very promising technology which involves lower energy consumption and costs than other conversion routes as well as high addedvalue products [3,5,7,11].…”

“…Pyrolysis products are obtained from primary decomposition reactions of organic feedstock (mainly of hemicellulose, cellulose, and lignin) and secondary decomposition reactions of primary products (e.g., gasification (reforming with CO 2 , H 2 , and steam) of condensable organic volatiles and biochar carbon, cracking of condensable organic volatiles, biochar aromatization) into low-molecular weight gases and biochar carbon [13][14][15][16]19]. Distribution, composition, and properties of biochar, bio-oil, and pyrolytic gases depend on different factors, e.g., type of pyrolysis and related operating parameters (heating rate, process final temperature, residence time of pyrolysis volatiles or flow rate of carrier gas), type, size, and pretreatment of organic feedstock, type and flow rate of carrier gas, reactor design [2][3][4][5][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Slow pyrolysis produces higher yields of biochar (30-60%), whereas less biochar (10-25%) and more bio-oil (60-75%) are commonly obtained by fast pyrolysis [7][8][9]17].…”

Management of Lignocellulosic Waste towards Energy Recovery by Pyrolysis in the Framework of Circular Economy Strategy

“…However, converting raw biomass directly into energy is not very profitable due to the fact that it is characterized by a high moisture and oxygen content, low calorific value and highly variable composition and properties [9]. Worth noting is the fact that biomass can be thermochemically transformed into different types of fuels, such as biochar, bio-oil, and gas, during such processes as torrefaction [10], pyrolysis [11], gasification [12] and hydrothermal liquefaction (Figure 1) [13,14].…”

Numerical estimation of the thermal stability boundaries for the process of thermochemical conversion processes of biomass in quasi-equilibrium approximation

“…In paper [6], on the basis of a simple model, the conditions for the existence of stationary modes of fixed-bed combustion of biomass were obtained. In papers [7,8], the process of biomass pyrolysis was investigated in the approximation of an isothermal perfectly stirred reactor using a kinetic mechanism based on work [9]. In present paper, a model is proposed that allows considering the pyrolysis and gasification processes of biomass using a simplified kinetic scheme, but for generalized heat transfer conditions.…”