Simulation of Reaction Kinetics and Heat Transfer Effects on Product Yields from Fast Pyrolysis of Oil Palm Empty Fruit
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Simulation of Reaction Kinetics and Heat Transfer Effects on Product Yields from Fast Pyrolysis of Oil Palm Empty Fruit Bunch Biomass in Fluidized Bed Reactor Kyaw Thu 1 & Taweesak Reungpeerakul 2 & Chayanoot Sangwichien 1
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The present work aims to optimize the operating conditions for biofuel production from fast pyrolysis of oil palm empty fruit bunch (OPEFB) biomass in a fluidized bed reactor. The coupled model of global reaction kinetics and heat transfer was applied to investigate the effects of operating conditions (reaction temperature in the range of 748–798 K, vapor residence time in the range of 0.5–2 s, and particle size in the range of 150–500 μm) on the yields of products (liquid (bio-oil), gas, and char) and particle heat transfer of the OPEFB biomass fast pyrolysis. The simulation results of the present model validated the reported experimental data of the product yields of OPEFB biomass fast pyrolysis. The results showed that the maximum yield of high-quality liquid product was obtained at a vapor residence time of 1 s and a reaction temperature of 773 K. Moreover, the OPEFB particle size in the range of 300–350 μm gave the highest yield of liquid product and the good heat transfer of particles. The optimum operating conditions from the simulation of the coupled model can be utilized for the experimental work of fast pyrolysis for different kinds of biomass in a fluidized bed reactor. Keywords Biofuel . Thermochemical conversion . Multi-component reaction mechanisms . Particle heat conduction . Optimization
Introduction Biomass has been considered an alternative clean energy source in recent years because of its renewable nature and a good fossil fuel replacement. Generally, biomass conversion is done via biological and thermochemical methods. However, thanks to advantages such as shorter residence time, large-scale application, and convenient reactor design, thermochemical process has become popular in converting biomass to high-energy-density products in the last decades [1]. Thermochemical process can be classified into three types such as combustion, gasification, and pyrolysis. Among them, pyrolysis is the most popular process because it can be done at an ambient pressure in the absence of oxygen to convert biomass to mainly liquid fuel. The main three types of pyrolysis * Chayanoot Sangwichien [email protected] 1
Department of Chemical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Thailand
2
Department of Computer Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Thailand
processes are slow (conventional), fast, and flash, differing in operating conditions such as reaction temperature, heating rate, nitrogen flow rate, residence time, and particle size [2]. The product of biomass pyrolysis can be classified into three categories: condensable gases (pyrolysis liquid), char, and non-condensable gases (CO, CO2, H2, CH4) [3]. The reactor also plays an impo
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