Open AccessStudy on the pyrolysis characteristics of walnut processing by-products
Author(s) -
Shanfeng Xu,
Chuan Ou,
Yuzhu Chen,
Hui Xiao,
Chengang Fu,
Wenyi Lu,
Zhuoling Wu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/508/1/012126
Subject(s) - pyrolysis , activation energy , carbonization , thermogravimetric analysis , degradation (telecommunications) , thermal stability , materials science , chemistry , residue (chemistry) , thermal , chemical engineering , composite material , organic chemistry , thermodynamics , scanning electron microscope , telecommunications , physics , computer science , engineering
Thermogravimetric analysis (TG) was used to study the thermal degradation behaviour of walnut shell and walnut meal during thermal treatment, and the Kissinger and Flynn-Wall-Ozawa equation were used to calculate the activation energy. The heating rate was 5, 10, 15, 20, 25 °C/min with nitrogen atmosphere. The results showed that the thermal degradation process of walnut shell and walnut meal can be divided into three stages: dehydration stage, rapid pyrolysis and carbonization stage. The greater the heating rate was, the faster the thermal degradation became. At the same heating rate, the weight loss rate, the peak conversion rate and the carbon residue in the rapid pyrolysis stage of walnut shell were all greater than those of walnut meal. The activation energy of thermal degradation of walnut shell was 194.54 kJ/mol and 194.50 kJ/mol. The activation energy of thermal degradation of walnut meal was 167.37 kJ/mol and 169.78 kJ/mol. Walnut shell had higher thermal degradation activation energy and thermal stability.