As an important renewable energy technology, solar thermal utilization is one of the important strategic goals for China's emerging energy development. Due to the uneven spatial and temporal distribution of solar energy and low energy flow density, there are disadvantages such as low utilization efficiency, high cost, and small scale. Therefore, the study of low-cost, high-efficiency concentrating solar advanced energy systems has important scientific significance for the development of concentrating solar thermal utilization technologies in China. With this as the goal, the Laboratory of Distributed Energy Supply and Renewable Energy of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences carried out theoretical and applied researches on the complementary mechanisms, system integration, and technical verification of solar energy and fossil fuels.
The research team explored the matching rules of irreversibly reduced energy in the complementary process of solar energy and fuel thermochemistry. Using the potential of chemical energy as an entry point, they reconfirmed the concentrating solar energy, fuel chemical energy, reaction Gibbs free energy, and heat. The maximal function of circulating heat energy and the relationship between grades have established the thermo-chemical complementary eigen equations of concentrating solar energy and fossil fuels, revealing that the fuel chemical combustion can reduce the grade of the combustion release and increase the energy of the concentrating solar energy collector. Mechanism of release; construction and improvement of the design method of mid-low temperature solar thermal chemical utilization absorption reactor, establishment of a multiphysics coupling model of solar absorption/reactor, development of a solar energy collection system simulation platform (PCT-HES), and revealing solar energy absorption The coupling laws of temperature field, flow field distribution, thermochemical reaction, thermal stress, etc. in reactor/reactor; proposed a new complementary method of “low energy of source†and “energy storage at source†of middle and low temperature solar energy and fuel thermal chemistry, developed 20kW, one hundred kW series solar thermochemical complementary power generation experiment platform realizes multi-energy complementary Distributed energy systems technology verification.
At the same time, the research team developed a concentrating solar complementary experiment platform and completed measurement of solar energy resources, determination of optical parameters of the concentrating system, absorption/reactor heat transfer and key parameters of reaction coupling, etc.; proposed the use of concentrating solar thermal energy. New methods for performance testing and regulation, invented methods for measuring the optical efficiency of trough solar collectors, etc.; expanded the research on solar thermochemical complementarity, and proposed a polygeneration system that complements the thermal chemistry of solar energy and biomass energy to achieve carbon dioxide Zero emissions, and carry out the principle of experimental verification.
The above work was supported by the National Natural Science Key Projects, Surface Projects, and National Science and Technology Support Projects. Research results have been published in international journals such as Applied Energy, Energy Conversion and Management, International Journal of Heat and Mass Transfer, and Solar Energy. More than 10 articles, authorized 2 US invention patents, authorized/apply for more than 10 national invention patents.
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