This paper designs a new multi-generation system based on solar tower power supply, integrating a solid oxide fuel cell-gas turbine system, a supercritical recompressed carbon dioxide cycle, a Rankine cycle, an organic Rankine cycle, a compressed air energy storage system and a liquefied natural gas system. The aim is to overcome the intermittent and unstable nature of the solar power supply and ensure continuous power generation throughout the day, a. This paper designs a new multi-generation system based on solar tower power supply, integrating a solid oxide fuel cell-gas turbine system, a supercritical recompressed carbon dioxide cycle, a Rankine cycle, an organic Rankine cycle, a compressed air energy storage system and a liquefied natural gas system. The aim is to overcome the intermittent and unstable nature of the solar power supply and ensure continuous power generation throughout the day, as well as improving the energy efficiency of the solar power system and minimising exhaust emissions from the integrated system. The system is modelled and evaluated in terms of energy, exergy, environment and economy. The results show the solar system energy efficiency of 10.09%, the total system energy efficiency of 19.28%, a round-trip efficiency of 58.66% and an exergetic round-trip efficiency of 52.06%, preventing the emission of 2090 tons of CO2 (a total of $50175 in environmental fines) per year. Finally, the proposed system was applied to a case study in the Xixiangtang district of Nanning, China, where the system, combined with real data, produced 24.8 MWh of electricity on the day with the highest direct of normal irradiance. In addition, the results of the economic analysis show the dynamic payback period is 6.9 years.••Solar energyCarbon captureSolid oxide fuel cell-gas turbineWaste heat recoveryCompressed air energy storage4E analysesA conductivity constantsAcell active surface area (m2)C˙ cost rate ($/h)Ctotal total system cost ($)Deff effective gaseous diffusivity (m2/s)e˙K The increasing global demand for energy causes the depletion of fossil fuels and increased environmental pollution. Developing renewable energy and improving energy efficiencies are essential to tackle such issues. Solar energy is inexhaustible and has been extensively explored. Concentrating solar power (CSP) technology is an important strategy to reduce energy dependency. CSP technologies include solar power towers (Yilmaz, 2018), parabolic troughs (Sen et al., 2021), linear Fresnel systems (Qiu et al., 2016) and dish concentrators (Nedaei et al., 2022). Among them, solar power towers have developed rapidly in recent decades due to their simple operation and large scale power generation (Qiu et al., 2017).However, solar power technology is intermittent and fluctuating. There is always a mismatch between peak power generation and consumer demand, resulting in the “duck curve” problem in the solar power plants (Wang et al., 2023). To alleviate this problem, researchers integrate energy storage and solar power technologies to overcome the disadvantages of poor interconnection and unstable power supply of renewable energy generation (Alirahmi et al., 2021b; Su, 2022; Shi et al., 2023). Existing energy storage technologies mainly include pumped hydro energy storage, compressed air energy storage (CAES), and liquefied air energy storage (LAES). Among which, CAES is more reliable, env. The proposed cogeneration system (Fig. 1) can produce electricity continuously. During the day, power is supplied mainly by the solar Brayton cycle and the SOFC-GT system, with excess power from the Brayton cycle going to the CAES system and power from the SOFC-GT system to the grid. The CAES system supplies compressed air to the SOFC-GT system for power generation at night or during peak demand periods. In the Brayton cycle, the heliostat solar receiver replaces the conventional combustion chamber, which not only transfers heat but also reduces carbon emissions. However, there is still a high energy density in this subsystem (pipeline S4) and in the exhaust gases emitted by the SOFC-GT system (pipeline g03), so the high-temperature RC and S–CO2 cycles and the low-temperature ORC cycle are designed to absorb as much heat as possible. The LNG system acts as a condensing unit for the WHR to improve energy efficiency, while most of the working fluid is converted to natural gas for household supply and only a small proportion is used to fuel the SOFC. LNG systems can also capture carbon dioxide from flue gases for cleaning purposes. The system has several functions, including electricity generation, hot water, cold water, and natural gas supply. The working principle of each subsystem is described below.The solar-powered Brayton cycle: The air is compressed in compressor 4 and.
