Experimental study on co-combustion of low rank coal semicoke and oil sludge by TG-FTIR.

Ruidong Zhao, Jianguang Qin, Tianju Chen, Leilei Wang, Jinhu Wu

Journal: Waste management (New York, N.Y.) 2020;116():91-99

PMID: 32799100

Full Text on Elsevier Science View on PubMed

Abstract

Co-combustion was proposed as an effective and complementary means for the co-treatment of low rank coal semicoke (LRCS) and oil sludge. The combustion, kinetics and gaseous pollutants emission characteristics during co-combustion of LRCS and oil sludge were investigated by thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG-FTIR). Results showed oil sludge had more complex weight loss characteristics than LRCS. Proper addition of oil sludge could effectively improve the ignition, burnout and comprehensive combustion performance of blends and 60% was a recommended oil sludge blend ratio. High heating rates could also enhance the combustion performance of blends. The activation energy determined by Coats-Redfern method gradually decreased with the increase of oil sludge blend ratio. DAEM kinetic analysis results showed the maximum activation energy of 113.4 kJ/mol was obtained when conversion rate was 0.4 due to the poor ignition performance of LRCS. All of the CO, CO, NOx and SO emission gradually decreased with the increasing oil sludge blend ratio. LRCS had suppression effect on NOx emission during co-combustion while oil sludge was just the opposite. The low sulfur release rate of oil sludge resulted in the decreasing SO emission of blends although oil sludge had promotion effect on SO emission.

Address: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China. Electronic address: [email protected].; Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.; Qilu University of Technology (Shandong Academy of Sciences), Ecology Institute of Shandong Academy of Sciences, Shandong Province Key Laboratory of Applied Microbiology, Jinan 250014, China.; Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China. Electronic address: [email protected].

DOI: 10.1016/j.wasman.2020.08.007

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MeSH Terms: Coal, Gases, Kinetics, Sewage, Spectroscopy, Fourier Transform Infrared, Thermogravimetry