PYROLYSIS KINETICS AND THERMODYNAMIC ANALYSIS OF BIOGAS RESIDUE AND ITS PYROLYSIS PRODUCT CHARACTERISTICS RESEARCH

Li Moshan; Tian Yishui; Hu Erfeng; Dai Chongyang; Li Chenhao; Shao Si

doi:10.19912/j.0254-0096.tynxb.2021-1132

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (6) : 226-233. DOI: 10.19912/j.0254-0096.tynxb.2021-1132

PYROLYSIS KINETICS AND THERMODYNAMIC ANALYSIS OF BIOGAS RESIDUE AND ITS PYROLYSIS PRODUCT CHARACTERISTICS RESEARCH

Li Moshan¹, Tian Yishui², Hu Erfeng¹, Dai Chongyang¹, Li Chenhao¹, Shao Si²

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Abstract

Pyrolysis kinetics of biogas residues were researched by FWO, Friedman and KAS methods, and its thermodynamic parameters including pre-exponential factor, enthalpy change, Gibbs free energy and entropy change, were also calculated. In addition, effects of the temperature on pyrolysis products distribution and properties were studied in a fixed-bed reactor with traditional electric heating. The pyrolysis process can be divided into three weightlessness stages, of which the second stage is the main weightlessness stage. The average activation energies calculated by Flynn-Wall-Ozawa （FWO） method, Friedman method and Kissinger-Akahira-Sunose （KAS） method is 410.00 kJ/mol, 471.32 kJ/mol and 420.01 kJ/mol, respectively, Thermodynamic parameter calculation results show that the pyrolysis process of biogas slag has stable energy output. The yield of liquid product increased first and then decreases with the increase of temperature. The high calorific value （HHV） of the gas products increases from 6.82 MJ/Nm³ at 400 ℃ to 8.54 MJ/Nm³ at 700 ℃. FTIR and Raman spectra show that the order of biochar structure increases with raising of pyrolysis temperature.

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thermodynamics / pyrolysis / kinetics / biogas residue / pyrolysis product / product analysis

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Li Moshan, Tian Yishui, Hu Erfeng, Dai Chongyang, Li Chenhao, Shao Si. PYROLYSIS KINETICS AND THERMODYNAMIC ANALYSIS OF BIOGAS RESIDUE AND ITS PYROLYSIS PRODUCT CHARACTERISTICS RESEARCH[J]. Acta Energiae Solaris Sinica. 2022, 43(6): 226-233 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1132

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