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Baseline Design of the Exergy Recovery and Solar Heating System at the Gas Pressure Reduction Station and its Technical, Economical, and Environmental Assessments

Talaei, Mohammad | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53775 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Saboohi, Yadollah
  7. Abstract:
  8. As producing and consuming of natural gas has increased in recent years, improving natural gas distribution and transfer network systems has become vital. Pressure reduction station (PRS) is an important part of the natural gas network. Common PRSs are facing two issues: first is the pressure reduction technology, which is throttling valve that destroys the exergy of the high pressure flow. The solution is to utilize turbo-expander instead which can recover the energy. Second is the preheating technology which is boiler and water bath heater in the common systems that cause environmental problems. Using solar collectors is one of the best solution based on the literature. Since the solar energy is available only in few hours of day, thermal storage plays an important role in solar energy technologies. However some studies investigated the using of solar energy for PRS, but there is a lack of exploitation for developing the thermal storage system. Using sensible thermal storage systems like water tank for solar thermal storage is not optimal because water temperature would always decrease during the discharging time so after some hours the water temperature would not be useful for preheating the natural gas. On the other hand using water tanks limits the tank input temperature due to the water low evaporation temperature. That’s why it is necessary to use heat sinks behind the water tanks. Using heat sinks would cause a significant thermal energy loss during the peak solar radiation time. So using phase change materials (PCM) helps to overcome mentioned problems. This work presents an optimal design of a novel energy recovery system at PRS using parabolic trough solar collectors and PCM. Two-objective optimization results shows that in the optimal point, 70 percent of total preheating energy provided by solar collectors and 30 percent provided by boiler. Total CO2 emission decreased by 80 percent in comparison with conventional systems
  9. Keywords:
  10. Expansion Turbine ; Phase Change Material (PCMs) ; Natural Gas Pressure Reduction Station ; Exergy Recovery ; Solar Thermal ; Environmental Assessment ; Economic Evaluation ; Energy Recovery

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