الفهرس 
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Abstract
This study investigates the performance of a turboexpander system for power recovery at natural gas pressure reduction stations.Natural gas is transported at high pressure across long distances. The pressure of the natural gas must be reduced before it is delivered to the consumer. Natural gas pressure reduction is typically achieved using pressure reducing valves, where isenthalpic expansion takes place with considerable amount of wasted energy .A non-negligible amount of pressure energy is wasted in the irreversible throttling process of the gas, and thus lowers its potential energy. The replacement of the gas-throttling process by an expansion process in a turbo expander (TB) makes it possible to convert the pressure energy of the natural gas into mechanical energy, which can be transmitted to a loading device, for example, through an electric generator. There is a considerable temperature DROP associated with the turboexpander process. Preheating is required in many cases to avoid undesirable effects of a low outlet temperature. This prehe~ting is essentially undertaken using gas fired boilers.Various system configurations were simulated by the general flow sheet simulator HYSYS and factors affecting the overall performance of the systems were investigated. Power outputs and fuel requirements were found using typical gas flow variation data. The simulation was performed for two case studies in which real input data are used. These case studies involve a domestic-commercial and an industrial natural gas pressure reduction stations in Egypt.Economic studies of using the turboexpander system in both of the two natural gas pressure reduction stations are conducted using precise data obtained through communication with several companies working in this field.The results of economic analysis for the two case studies, prove that using turboexpander systems in Egyptian .natural gas reduction stations can be a successful project for energy conservation.