Loading...

Co-combustion studies of low-rank coal and refuse-derived fuel: performance and reaction kinetics

Azam, M ; Sharif University of Technology | 2021

376 Viewed
  1. Type of Document: Article
  2. DOI: 10.3390/en14133796
  3. Publisher: MDPI AG , 2021
  4. Abstract:
  5. In connection to present energy demand and waste management crisis in Pakistan, refuse-derived fuel (RDF) is gaining importance as a potential co-fuel for existing coal fired power plants. This research focuses on the co-combustion of low-quality local coal with RDF as a mean to reduce environmental issues in terms of waste management strategy. The combustion characteristics and kinetics of coal, RDF, and their blends were experimentally investigated in a micro-thermal gravi-metric analyzer at four heating rates of 10, 20, 30, and 40 °C/min to ramp the temperature from 25 to 1000 °C. The mass percentages of RDF in the coal blends were 10%, 20%, 30%, and 40%, respec-tively. The results show that as the RDF in blends increases, the reactivity of the blends increases, resulting in lower ignition temperatures and a shift in peak and burnout temperatures to a lower temperature zone. This indicates that there was certain interaction during the combustion process of coal and RDF. The activation energies of the samples were calculated using kinetic analysis based on Kissinger–Akahira–Sunnose (KAS) and Flynn–Wall–Ozawa (FWO), isoconversional methods. Both of the methods have produced closer results with average activation energy between 95–121 kJ/mol. With a 30% refuse-derived fuel proportion, the average activation energy of blends hit a minimum value of 95 kJ/mol by KAS method and 103 kJ/mol by FWO method. © 2021 by the authors. Licensee MDPI, Basel, Switzerland
  6. Keywords:
  7. Activation analysis ; Activation energy ; Coal ; Coal industry ; Fossil fuel power plants ; Kinetics ; Reaction kinetics ; Refuse derived fuels ; Waste incineration ; Waste management ; Coal-fired power plant ; Combustion characteristics ; Combustion pro-cess ; Environmental issues ; Ignition temperatures ; Iso-conversional method ; Lower temperatures ; Waste management strategies ; Coal combustion
  8. Source: Energies ; Volume 14, Issue 13 , 2021 ; 19961073 (ISSN)
  9. URL: https://www.mdpi.com/1996-1073/14/13/3796