Energy supply system and method for integrated fuel cell and supercritical carbon dioxide solar thermal power generation

Abstract

The invention discloses an energy supply system and method integrating a fuel cell and supercritical carbon dioxide solar heat power generation. A solid oxide fuel cell subsystem, a supercritical CO2cycle subsystem and a light gathering type solar heat gathering subsystem are included. The energy supply system integrating the fuel cell and supercritical carbon dioxide solar heat power generationutilizes tail gas exhausted by the solid oxide fuel cell subsystem as a high-temperature heat source and an auxiliary low-temperature heat source of the supercritical CO2 cycle subsystem, and heat generated by the light gathering type solar heat gathering subsystem serves as a low-temperature heat source of the supercritical CO2 cycle subsystem. According to the system, on the basis that stable and continuous work of a supercritical CO2 solar heat power generation system is guaranteed, the medium-low-temperature solar energy is utilized to the maximum, efficient gradient utilization is conducted on the waste heat of the tail gas of a solid oxide fuel cell, and the comprehensive energy utilization rate is further improved; and under the rated work condition, the net power generation efficiency can reach 75.06%, and the comprehensive energy utilization rate of the system can reach 97.85%.

Description

Technical field [0001] The invention relates to the technical field of distributed energy supply systems, and in particular to a distributed energy supply system and method integrating solid oxide fuel cells and supercritical carbon dioxide mid-low temperature solar thermal power generation. Background technique [0002] Currently, supercritical CO 2 The application of the Brayton cycle in nuclear and solar power generation has been extensively studied. This is due to supercritical CO 2 The density near the critical point is higher, the compression work can be reduced, and the supercritical CO 2 Compressors, turbines and other power system equipment that are working fluids have a compact structure and a small footprint, which can reduce investment costs. Supercritical CO 2 The cycle can reach a higher cycle thermal efficiency when the maximum cycle temperature is 500-850°C, and the cycle performance is significantly higher than that of a commercial steam power cycle. However, hi...

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Problems solved by technology

However, although high-temperature heat sources such as nuclear reactors and concentrating high-temperature solar energy are compatible with supercritical CO 2 The circulation can carry out good temperature matching, but the nuclear power plant and the concentrated solar field occupy a large area, and the nuclear power plant has certain dangers, so the above-mentioned high-temperature heat source used for distributed energy is supercritical CO 2 Hydronic heating is subject to certain limitations

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