Open AccessStudy on Combustion Characteristics and Kinetics Analysis of Zhundong Lignite
Author(s) -
Guanyu Wang,
Xianchun Li,
Fanrui Meng,
Huanran Wang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/721/1/012044
Subject(s) - thermogravimetric analysis , combustion , coal , activation energy , heat of combustion , nitrogen , materials science , carbon fibers , water content , hydrogen , coal combustion products , moisture , kinetics , chemical engineering , waste management , environmental science , chemistry , composite material , organic chemistry , geology , engineering , geotechnical engineering , physics , quantum mechanics , composite number
The high moisture and low calorific value of Zhundong lignite restricts its long-distance transportation and large-scale application. In this paper, the elemental composition changes and combustion characteristics of the upgraded lignite were studied, and then the combustion reaction kinetics of the upgraded lignite was analyzed by the Flynn-Wall-Ozawa (FWO) method. The results show that with the increase of the upgrading temperature, the content of volatiles and water in the coal decrease, which leads to an increase in the proportion of carbon, nitrogen and sulfur, and a decrease in the content of hydrogen and oxygen. The thermogravimetric curve of the upgraded lignite increases between 573K and 673K as the heating rate increases due to the influence of thermal buoyancy and inhalation gain. The burnout index Hj obviously increases with the increase of the heating rate, and the burnout condition of the coal is obviously improved. The apparent activation energy obtained at the same conversion rate and decreases with the increase of the upgrading temperature, which proves that the increase of the upgrading temperature reduces the apparent activation energy of the upgraded lignite.