Feasibility Assessment Study on Residual Pressure Power Generation in Xiangguosi Gas Storage Facility

Abstract

Since its establishment, Xiangguosi Gas Storage has carried out dozens of gas production operations, with a cumulative gas production of 20 × 10⁸m³ during the gas production period. The gas source pressure of the storage has reached over 10MPa, and it has abundant natural gas pressure difference resources. However, in the transportation and production process of gas storage facilities, a large amount of natural gas pressure energy is wasted without being utilized, directly entering the station infrastructure, pressure regulating valves and other pipelines. Therefore, this article discusses the feasibility assessment of the construction of residual pressure power generation projects based on the pressure difference resources existing in the Xiangguosi gas storage facility. The results show that the residual pressure resources at the J-T valve dehydration device of the Xiangguosi gas storage facility are abundant and can meet the conditions for low-temperature natural gas reheating and export, making it feasible for residual pressure power generation; If a residual pressure power generation equipment with a total installed capacity of 1800kW is constructed in the J-T valve dehydration unit of Xiangguosi gas storage facility, based on the annual power generation hours of 2640h during the gas storage period, the residual pressure power generation capacity is 451.6kWh, saving 1361.09tce of standard coal annually and reducing 3583.84t of carbon dioxide annually. The estimated total investment for construction is 21.6 million yuan, with an average annual operating income of 3.14 million yuan, an internal rate of return on project investment of 9.16%, and a static investment payback period of 9.84 years.