Synthesis and optimization of combustion of briquettes based on substandard brown coals of Kazakhstan deposits with multipolymer binders

Authors

  • Marat I. Tulepov 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan http://orcid.org/0000-0002-6449-9571
  • Larissa R. Sassykova Al-Farabi Kazakh National University http://orcid.org/0000-0003-4721-9758
  • Dauren A Baiseitov 1. Faculty of Geography and Environmental Sciences, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan
  • Bibigul U Rakhimova 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan
  • Fedosya Y Abdrakova 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan
  • Galiya A Spanova Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan.
  • Sestager Kh Aknazarov 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, 2. The Combustion Problems Institute, 3. Scientific and Production Technical Center “Zhalyn” LLP.
  • Zhansaya Beksultan Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University

DOI:

https://doi.org/10.13171/mjc02003271253ls

Abstract

The work aimed to study the process of burning coal briquettes with polymers. As the object of the research, the coals of Kazakhstan deposits were applied. The methodology of the study included theoretical and computational studies on the applied significance of coal processing, analysis by physicochemical research methods, pressing, drying and briquetting of coal with binders. It is shown that the briquettes combustion takes place stepwise and is characterized by a stationary regime. This is due to the mutual influence of the stages of pyrolysis of polyolefins and combustion of coke residue of substandard coal. In the combustion zone, the temperature did not depend on the content of polyethylene and was 400–500ºC in the coal burnout zone. The optimal compositions of briquettes supporting the combustion temperature of 1300°С were determined: coal-40 %, clay-20 %, polyethylene-40 %. Adding up to 20% clay to the polymer and coal mixture led to the formation of a combustion wave structure with symmetric temperature profiles. Thermogravimetric analysis shows that polyethylene plays the role of the initiator of combustion, burning at   500ºC, and in the future does not affect the maintenance of the combustion temperature of the briquette. The perspective of the results obtained is the possibility of utilization of low-demand coals of various brands of Kazakhstan deposits, which are waste of coal mining and coal enrichment with further production of coal briquettes of the required quality. Coal briquettes made from substandard coals with a multi-polymer binder, from chemical production waste have a higher calorific value, are mechanically robust during prolonged storage, do not crumble in the furnace until complete combustion, and are waterproof. These advantages determine their use for the population, as well as for various purposes of industrial economy, metallurgy and chemical industry.

Author Biographies

Marat I. Tulepov, 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan

Ph.D., Ass.Prof., Head of the Department

Larissa R. Sassykova, Al-Farabi Kazakh National University

ProfessorFaculty of Chemistry&Chemical Technology, Department of Physical Chemistry, Catalysis&Petrochemistry

Dauren A Baiseitov, 1. Faculty of Geography and Environmental Sciences, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan

Senior lecturer of the UNESCO Chair in Sustainable Development, Faculty of Geography and Environmental Sciences, al-Farabi Kazakh National University; Senior Researcher, The Combustion Problems Institute, 172, Bogenbai batyr str., 050012, Almaty, Kazakhstan.

Bibigul U Rakhimova, 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan

Leading Specialist, Department of Chemical Physics and Material Science, Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University; laboratory assistant, the Combustion Problems Institute, 172, Bogenbai batyr str., 050012, Almaty, Kazakhstan.

Fedosya Y Abdrakova, 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan. 2. The Combustion Problems Institute, Almaty, Kazakhstan

PhD doctoral student, Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University; junior research worker, the Combustion Problems Institute, 172, Bogenbai batyr str., 050012, Almaty, Kazakhstan.

Galiya A Spanova, Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan.

Ph.D., Deputy Head of the Department of Chemical Physics and Material Science, Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University

Sestager Kh Aknazarov, 1. Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, 2. The Combustion Problems Institute, 3. Scientific and Production Technical Center “Zhalyn” LLP.

Prof., the Department of Chemical Physics and Material Science, Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University; leading researcher, the Combustion Problems Institute, 172, Bogenbai batyr str., 050012, Almaty, Kazakhstan; leading researcher, Scientific and Production Technical Center “Zhalyn” LLP, 172, Bogenbai Batyr str., 050012, Almaty, Kazakhstan.

Zhansaya Beksultan, Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University

Teacher, the Department of Chemical Physics and Material Science, Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University

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Published

2020-03-27

Issue

Vol. 10 No. 3 (2020)

Section

Materials Chemistry

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