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Optimization of Heat Recovery and Water Capture System from Boiler Flue Gas

Armin, Bahman | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46852 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Saboohi, Yadollah
  7. Abstract:
  8. Thermal energy and water in flue gases varies with the type of fuel and thermal conversion system. Flue gas temperature is maintained in the range of 140 (℃) to 200 (℃) and it is subject to the sulfur content of the fuel. Vapor content of the flue gas is in the range of 10%_20% of volumetric flow. Considerable part of vapor may be recovered which can be used as cooling water make up. There are various means and methods for water capture and heat recovery which includes shell-tube heat exchanger among others. Selection of appropriate material and heat exchanger is conditioned by corrosion, temperature of flue gas and it’s economic feasibility. Identification of an optimal design of appropriate heat exchanger has been subject of the present research work. First various design options of heat exchanger were examined by simulation technique. Result of simulation indicates that the temperature of flue gas could be redused to 45 (℃) with the help of energy recovery system based on special arrangement of heat exchangers. Economic analysis of the heat recovery system shows that investment costs would be $ 227280 with a payback period of 4752 h. Rate of water capture would be 1.667 (kg/s) and natural gas consumption shall be redused by 0.2623 (kg/s)
  9. Keywords:
  10. Optimization ; Water Extraction ; Flue Gas ; Heat Energy ; Heat Exchangers

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