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Current research and ways of capturing mechanical energy are discussed in this paper.By the aid of the comprehensive thermodynamic analysis and Aspen simulation tool,the amount of available work that can be produced from capturing the pressure energy has been calculated.Based on the comprehensive thermodynamic analysis,two systems have been proposed to capture pressure energy of natural gas to generate electricity.In this study,the expression of exergy is given which can be used in evaluating purposes.A problem with this multidisciplinary study is the complicated boundary condition.In conclusion,a technical prospect on recoverable natural gas pressure energy has been presented based on total energy system theory.