Fast pyrolysis of Douglas fir by using tilted-slide reactor and characteristics of biocrude-oil fractions

Abstract

a b s t r a c tA tilted-slide fast pyrolyzer was designed for the large-scale production of biocrude-oil. Woody biomass (Douglas fir) was fed into the reactor under different experimental conditions, including reaction temperature and biomass feeding rate, in order to study the biocrude-oil yield and its characteristics. One spray type condenser was used to condense the biocrude-oil by direct contact heat transfer and three shell and tube type condensers were used to collect biocrude-oil by indirect contact heat transfer. The highest biocrude-oil yield (61.9 wt.%) was obtained at 490 C and a feeding rate of 12.5 kg/h, with most biocrude-oil was collected in the spray type condenser. The characteristics of the biocrude-oils obtained from each condenser were scrutinized and compared, and GC/MS analysis was also conducted to ascertain the chemical components of the biocrude-oil thus obtained.

Fast pyrolysis of coffee ground in a tilted‐slide reactor and characteristics of biocrude oil

“…This temperature is identical to the previous study in a lab-scale bubbling-fluidized-bed reactor of 0.4 kg/h, where the maximum yield was approximately 55% [19]. The temperature for the maximum yield was about 608C higher than the optimum value for the pyrolysis of woody biomass [10], which was 4908C for Douglas fir. The maximum biocrude oil yield from coffee grounds was about 5.7% lower than that from woody biomass, which was 64.7% in the same reactor [11].…”

“…The temperature for the maximum yield was about 60°C higher than the optimum value for the pyrolysis of woody biomass , which was 490°C for Douglas fir. The maximum biocrude oil yield from coffee grounds was about 5.7% lower than that from woody biomass, which was 64.7% in the same reactor .…”

“…There have been many studies on the fast pyrolysis of biomass in various pyrolysis reactor configurations, such as a bubbling fluidized bed reactor, a circulating fluidized bed reactor, an ablative reactor, a rotating cone reactor, a vacuum reactor, a conical spouted bed reactor, and a tilted‐slide reactor . For achieving fast pyrolysis, woody biomass has been widely used along with herbaceous plants.…”

Lignocellulosic biomass. Part II: Tendence in the biomass pyrolysis.

“…Los reactores de pirólisis de lecho fluidizado son los tipos de reactor más documentados y disponibles comercialmente entre todas las tecnologías de pirólisis rápida y se utilizan para producir bio-oil de alta calidad con rendimientos muy altos de ~70-75 % (Verma et al , 2012;Sharma, A. et al 2015). Sin embargo, el gran tamaño del reactor y el alto costo de construcción y operación son sus principales desventajas (Dhyani y Bhaskar, 2017;Bok et al, 2014;Leal, 2014). Por lo general, el reactor RLF se acopla a una tolva por donde ingresa la biomasa, y esta tolva está conectada a un tornillo sin fin encargado de transportar la materia prima a través de un barril calentado, donde se llevan a cabo las reacciones de termo-transformación.…”

Influence of reactor and condensation system design on tyre pyrolysis products yields

“…On the other hand, spray tower or spray quench systems utilize a re-circulated spray of water/pyrolysis liquid in counter-current manner to cool and collect all of the liquid at once [28,[31][32][33][34], and is usually employed at larger scale units. It is noteworthy that direct contact heat exchangers have a number of advantages over the indirect ones, as are simpler design, lower capital and maintenance costs, higher specific heat transfer areas, and higher heat transfer rates [35].…”