In this work, a supercritical CO₂ system integrating solar energy and biomass is proposed to mitigate the emission of the greenhouse gases, and realize the stable and efficient operation of the system. The proposed system mainly contains three parts, i.e., solar island, biomass burner and power block. With the consideration of the variations of the solar irradiation and the complementation of the biomass, the on-design and off-design thermodynamic performances of this system are numerically studied. Results indicate that the solar-to-electric efficiency of the system can reach to 27.85% at the design point, and the ratios of solar heat supply in the power cycle in four representative days are in the range of 15.7–36.4%. The exergy analyses are implemented to investigate the irreversible losses and the variation of the exergy destruction in the energy conversion process. The economic evaluations are carried out to illustrate the feasibility of the proposed system, and the LCOE of the system is 0.085 $/kW h. Theoretical results indicate that the supercritical CO₂ system with multi-energies input is a promising option for the efficient utilization of the abundant solar and biomass resources in western China.

在这项工作中，超临界CO ₂为了减少温室气体的排放，实现系统的稳定高效运行，提出了一种太阳能与生物质相结合的系统。拟议的系统主要包括三个部分，即太阳能岛，生物质燃烧器和动力块。考虑到太阳辐射的变化和生物质的补充，对该系统的设计时和设计时热力学性能进行了数值研究。结果表明，在设计点，系统的太阳能发电效率可达到27.85％，并且在四个代表日的功率循环中，太阳能供热比率在15.7–36.4％的范围内。进行了火用分析以研究能量转换过程中的不可逆损失和火用破坏的变化。系统的LCOE为0.085 $ / kW h。理论结果表明，多能输入的超临界CO ₂系统是有效利用西部丰富的太阳能和生物质资源的有前途的选择。