Abstract
Gas pressure reduction stations are commonly applied to decrease the pressure of natural gas in the transmission pipelines. In such stations, natural gas is expanded in throttling valves without producing any energy. Through the use of expander in natural gas pressure reduction stations, it is possible to recover the pressure energy of the natural gas during expansion, and drive the electrical generator. Possible solutions include turbines and volumetric expanders. However, turbines are complicated and expensive, while volumetric expanders are simple and cheap. This paper presents an analytical modeling of rolling piston expander work conditions when adopted to natural gas expansion. The main objective of this research was therefore a comprehensive analysis of influence of varied sizes of the expander components and natural gas thermal properties at the inlet and at the outlet of the expander, on the expander output power. The analysis presented in this paper indicates that the rolling piston expander is a good alternative to the turbines proposed for energy recovery in natural gas pressure reduction stations.
Highlights
One of the most important issues in industry is efficient and continuous provision of natural gas supply
In the present we propose the utilization of a rolling piston expander as aninstead engine, In the present study, we propose the utilization of a rolling piston expander as an engine, In the present study, we propose the utilization of a rolling piston expander as an engine, using a throttling valve, allowing the recovery power that lost in a pressure ofinstead using aofthrottling valve, allowing the recovery of powerof that is lost in is a pressure reductionreduction station
The detailed mathematical description of chamber and formulas for calculating the output power of the expander are included in the model
Summary
One of the most important issues in industry is efficient and continuous provision of natural gas supply. Large amounts of natural gas are used in many industries, e.g., in metallurgy, power, chemical and petrochemical plants [1]. Natural gas is transported to these factories through transmission and distribution pipelines at different pressure ranges. Transmission pipelines can be classified by the gas overpressure range into the following categories [2]: . The high gas pressure must be reduced before entering devices and machines (e.g., boilers, engines, metallurgical furnaces, etc.). The pressure reduction station is a commonly applied technology for reducing natural gas pressure both in gas transmission and distribution pipelines. Reduction of the natural gas pressure in a pressure reduction station is carried out via isenthalpic throttling without producing any energy [3]
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