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Development of Cement Production Model to Reduce and Capture CO2 Emissions

Baramaki, Morteza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48055 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Avami, Akram
  7. Abstract:
  8. Energy consumption and pollutions especially carbon dioxide emissions are two of the main challenges in the cement industry. 5-7 percent of world’s carbon dioxide emissions is due to cement production while 900 kg of carbon dioxide is emitted for the production of a tone of cement. The main source of carbon dioxide emissions in a cement plant is the combustion of fuel to provide heating demands and also converting the ore into clinker. Therefore, any improvement in energy efficiency in a cement plant could reduce carbon dioxide emissions resulting from the combustion. Important ways of energy recovery in a cement plant are using the energy recovered from the exhaust gas in the preheater furnace and precalciner, use of alternative fuels and technologies, and combined heat and power production to supply part of the energy consumed. Given the high potential of energy recovery in cogeneration systems, optimal design of a cogeneration system to reduce energy consumption and carbon dioxide emissions from fuel combustion in a specific cement plant is investigated in this research. The tire is also used as an alternative fuel. About 1.2 to 1.5 and about 0.84 to 1.02 tons of worn-out tires is needed to replace 1 ton of oil and a thousand cubic meters of gas respectively in order to save the use of fossil fuels. In this thesis, a calcium cycle is used for trapping carbon. The proposed method is based on the reversible process of conversion and absorbtion where material in this cycle spins between two calciner and carbonator reactants with high efficiency and low energy consumption, which can reduce emission of carbon dioxide in the atmosphere to a minimum or even zero. A coherent plan for trapping carbon based on calcium cycle and energy recovery in precalciner and preheater and cogeneration has been proposed in this research. In this plan, carbon dioxide absorption rate of 95% and 285 kilowatts of power for the cogeneration system for a case study plant which is fed at a rate of 8000 kg per hour and produces 4486 kg clinker per hour is reported. Using of alternative fuels at the case study plant can provide up to 25 percent of the heating fuel consumption. Moreover, laboratory samples were made and tested to check calcium cycle efficiency and performance
  9. Keywords:
  10. Alternative Fuel ; Combine Cooling Heating and Power (CCHP) ; Cemen industry ; Energy Storage ; Energy Conservation ; Calciume Cycle Method ; Trapping Carbon Dioxide

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