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Simulation and Estimation of Power Generation in Natural Gas Network by Micro Turboexpanders
, M.Sc. Thesis Sharif University of Technology ; Farhadi, Fatolah (Supervisor)
Abstract
This thesis studies the economic feasibility of replacing a throttling valve with an expansion turbine in a city gate station for the purpose of distributed electricity generation through exergy recovery from pressurized natural gas. Conventionally, high pressure natural gas stream enters a pressure reduction station with its physical exergy completely destroyed in an irreversible Joule-Thompson effect of a throttling valve. To avoid hydrate formation at the outlet of the turboexpander, the inlet stream should be preheated. Although pressure reduction stations are inherently subject to seasonal fluctuations of inlet natural gas pressure and flow rate, the preheating temperature should be...
Optimal detailed design and performance assessment of natural gas pressure reduction stations system equipped with variable inlet guide vane radial turbo-expander for energy recovery
, Article Journal of Natural Gas Science and Engineering ; Volume 96 , 2021 ; 18755100 (ISSN) ; Rezaei, F ; Saboohi, Y ; Sharif University of Technology
Elsevier B.V
2021
Abstract
The turbo-expander system is utilized instead of the pressure regulator to avoid exergy destruction occurring in gas pressure reduction systems. However, due to the variation of natural gas input conditions such as mass flow rate, the sustainable performance of this technology is challenging. In this study, at first, the optimal system design of gas pressure reducing station equipped with radial expansion turbine is performed. It is based on economic and exergy analyses as well as considering geometric, fluid, thermodynamic constraints of components and the systematic constraints. To do so, detailed design models of main components including mean-line design model of radial turbine,...
Baseline Design of the Exergy Recovery and Solar Heating System at the Gas Pressure Reduction Station and its Technical, Economical, and Environmental Assessments
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
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...
Dynamic System Optimal Design Model: Designing and Evaluation of Turboexpander System Operation
, Ph.D. Dissertation Sharif University of Technology ; Saboohi, Yadoolah (Supervisor)
Abstract
According to Iran’s energy policies, the natural gas transmission pipeline has expanded significantly over the last decade. Moreover, improving energy efficiency is known as a key strategy in energy policies and programs. Therefore, the need for expansion and development of the rational use of energy has received more and more attention. The use of technologies aimed at energy recovery will be an effective step in this regard. Pressure regulators are most commonly used to reduce this pressure in Iran as one of the significant sources of exergy destruction in Iranian gas transmission system. The turbo-expander system is a kind of technology applied in gas pressure reduction stations to...