Research on the co-pyrolysis of coal gangue and coffee industry residue based on machine language: Interaction, kinetics, and thermodynamics

Zhanshi Ni; Haobo Bi; Chunlong Jiang; Junjian Tian; Hao Sun; Wenliang Zhou; Qizhao Lin

doi:10.1016/j.scitotenv.2021.150217

Research on the co-pyrolysis of coal gangue and coffee industry residue based on machine language: Interaction, kinetics, and thermodynamics

Sci Total Environ. 2022 Jan 15:804:150217. doi: 10.1016/j.scitotenv.2021.150217. Epub 2021 Sep 9.

Authors

Zhanshi Ni¹, Haobo Bi¹, Chunlong Jiang¹, Junjian Tian¹, Hao Sun¹, Wenliang Zhou¹, Qizhao Lin²

Affiliations

¹ Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Jinzhai Road, Hefei 230026, China.
² Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Jinzhai Road, Hefei 230026, China. Electronic address: qlin@ustc.edu.cn.

PMID: 34520910
DOI: 10.1016/j.scitotenv.2021.150217

Abstract

Co-pyrolysis technology of urban solid waste and biomass has broad application prospects in alleviating energy crisis and environmental pollution. In this study, thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR) was used to study the co-pyrolysis characteristics of coal gangue (CG) and coffee industry residue (CIR). CG and CIR were uniformly mixed according to the mass ratios of 1: 0, 7:3, 5:5, 3:7, and 0:1. Then the samples were heated and pyrolyzed in an atmosphere with a nitrogen flow rate of 60 mL/min. As the proportion of CG increased, the comprehensive pyrolysis index (CPI) showed an exponential decrease. FTIR detected that the gas produced by pyrolysis of CG-CIR contained hydroxyl compounds, hydrocarbons, CO₂, CO, Phenols, and NH₃. CG-CIR co-pyrolysis had obvious interaction. By using Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods, the relationship between activation energy (E_α) and kinetic parameters and conversion degree was studied. Principal component analysis (PCA) was used to determine the principal reaction of CG-CIR pyrolysis. ANN 21 was the best model for predicting the pyrolysis of CG-CIR.

Keywords: Co-pyrolysis; Coal gangue; Coffee industry residue; Machine language; TG-FTIR.

MeSH terms

Biomass
Coal* / analysis
Coffee
Kinetics
Language
Pyrolysis*
Thermodynamics
Thermogravimetry

Substances

Coal
Coffee