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Investigation of the Effect of Gas Additive (Such as Carbon Dioxide) to Methane Fuel in Creating Flameless Combustion

Safaei, Sara | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57541 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Nowadays, despite the development of technology and the spread of new energy consumption, resources such as oil, coal and natural gas still have the largest share of global consumption, and this means that the combustion of fossil fuels, despite of many environmental challenges, is still the most common source of energy in the world. Issues related to environmental pollution are the main challenges in using this type of energy. The emission of gaseous pollutants such as nitrogen oxides and carbon monoxide, as well as the emission of greenhouse gases resulting from the combustion of fossil fuels, have caused many negative environmental effects and global warming. Flameless combustion is one of the newest solutions to this problem. In this method, preheating the fuel and diluting the oxygen in the mixture, some results such as reducing the production of pollutants like nitrogen oxides and carbon monoxide, reducing the temperature gradient of the combustion chamber, reducing fuel consumption and reducing acoustic vibrations in the combustion domain could be achieved. According to this, in the current research, the effects of adding carbon dioxide, nitrogen and hydrogen gases to the air, in creating flameless combustion of methane and producing pollutants such as nitrogen oxides and carbon monoxide, are investigated. The obtained results show that adding too much hydrogen to the inlet air can lead to flame instability. According to this research, the allowed molar concentration of this additive to achieve a flameless combustion regime is less than 40%. In general, the use of these diluents can lead to the reduction of harmful environmental effects such as the production of pollutants. Also, achieving the appropriate pattern of combining these additives to create flameless combustion can bring positive economic effects by increasing the life of the furnace, reducing fuel consumption, etc
  9. Keywords:
  10. Flameless Combustion Regime ; Carbon Monoxide ; Moderate or Intense Low Axygen Dilution (MILD) ; Nitrogen Oxides ; Methane ; Fossil Fuels ; Gas Additive

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