Gas Characteristics of Pine Sawdust Catalyzed Pyrolysis by Additives
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https://doi.org/10.1007/s11630-020-1244-z
Article ID: 1003-2169(2020)00-0000-00
Gas Characteristics of Pine Sawdust Catalyzed Pyrolysis by Additives YU Dongling1, JIN Guang1, PANG Yunji1,2*, CHEN Yisheng1, GUO Shaopeng1, SHEN Shengqiang2 1. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014000, China 2. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: In order to effectively investigate the variation of gas production characteristics of biomass under normal-speed pyrolysis conditions, the gas production rate, gas production component yield and gas production calorific value of pine sawdust with adding Na2CO3, CaO and Fe2O3 were systematically analyzed. In the experiment, an improved tube furnace was used to research the pyrolysis process with the temperature from 350°C to 750°C. The results indicate that the gas yield rises with the increase of temperature without additives, reaching 19.59% at 750°C. The liquid yield reaches 59.38% at 450°C and then the yield change is small. CaO increases the calorific value of the pyrolysis product gas due to the adsorption of CO2. Na2CO3 is fused with inorganic substances in the biomass to form a char skeleton structure. The effect of Fe2O3 on H2 is more obvious at higher temperature. Na2CO3 has the most obvious effect on the pyrolysis of pine sawdust among the discussed additives, which effectively promotes the production of H2.
Keywords: pine sawdust, pyrolysis, additive, catalysis, gas analysis
1. Introduction Biomass is the only renewable carbon source, mainly composed of cellulose, hemicellulose and lignin, with the potential to generate heat, fuel, and chemical products. Biomass pyrolysis and gasification technologies have good economic and social benefits [1]. Pyrolysis can be used to convert biomass into tar, gas and char. The distribution of pyrolysis products is greatly affected by the reaction conditions, including temperature, heating rate, catalyst, particle size and other factors. Biomass pyrolysis is not only an independent thermochemical high-efficiency conversion technology, but also an indispensable transformation stage in combustion and gasification processes [2‒4]. The pyrolysis process can be represented by Fig. 1. This is an extremely Received: Nov 05, 2018
AE: LIU Qibin
complicated process. It includes physical processes such as heat transfer and material diffusion, as well as chemical processes such as chemical bond cleavage, intramolecular dehydration, and functional group rearrangement. The two processes interact with heat as the primary medium. By varying the pyrolysis process and reaction conditions, the proportion of the solid-liquid-gas three-phase product can be adjusted over a larger range. Therefore, deeply research on biomass pyrolysis technology is of great significance. However, current pyrolysis studies have focused
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