مشخصات پژوهش

Due to the growing trend of energy consumption in the world, the use of various renewable energy sources, including bio- mass, along with methods to increase the efficiency of energy systems has been considered. The presence of nitrogen in natural gas reduces the heating value of the fuel, increases the size of transmission lines and the capacity of gas pressure boosting stations. As a result, nitrogen is removed from natural gas with a concentration of more than 4 mol% at high current intensities. In the present study, a novel combined system for liquefied natural gas (LNG) production using nitrogen separa- tion unit (ASU), absorption-compression refrigeration cycle, power generation plant, and biomass gasification process is developed. A cascade unit including the compression-absorption refrigeration and the mixed refrigerant systems is used to provide cryogenic energy in the proposed process. The specific power consumption of the liquefaction process is achieved as 0.7673 kWh/kg LNG. The total thermal efficiency of the integrated system is obtained by 54.29%. Pinch assessment is utilized to investigate the multi-stream heat exchangers and extracting relative heat exchanger networks. The pinch analysis results illustrate that the MHX1, MHX2, and MHX3 multi-stream heat exchangers have 3, 6, and 18 separate heat exchangers, respectively. Parametric analysis indicates on the system parameters indicated that the total thermal efficiency can be increased up to 58.80% by maximizing the generated LNG (as much as possible) and not injecting nitrogen into the gas turbine combustor.