目前，复杂组成的化石燃料与可再生燃料的能量品位表征仍是学术空白，相关基础热力学性质数据十分匮乏，制约了燃料的高效利用。本项目将从热力学第二定律的角度揭示化石燃料与可再生燃料的能量品位特征。.首先，确定典型液固均相复杂组成化石燃料与典型可再生燃料的代表物，结合实验数据获得其化学构成信息。基于燃料所含元素的标准㶲、标准焓以及其化学构成信息，研究燃料的元素组成对燃料能量性质与品位性质的关联规律，并探索模型化新方法。最终，基于本研究燃料的标准能量与品位模型，提出一系列常规燃料的标准焓、标准㶲和标准能量品位的数据。例如低阶煤、页岩油、纤维素燃料、生物质燃料、垃圾和沼气等；并据此开展典型能量系统的能量分析与品位分析。.本项目的预期成果有望为复杂组成燃料在工程热物理以及热力学学科相关前沿的发展，为我国十三五期间燃料的绿色利和能源供给侧结构的多元化等方面，提供数据与方法学的基础支撑。

Recently, the energy grade characterization of fossil fuels and renewable fuels with complex compositions is rarely studied, and the basic thermodynamic data is much scarce, which is not good for the effective use of fuels. This project will reveal the energy grade characteristics of fossil fuels and renewable fuels on the basis of the second law of thermodynamics..Firstly, the typical representative of solid and liquid fossil fuels and renewable fuels with complex compositions were selected, and then the chemical composition of fuel was studied by means of experimental instruments. Based on the standard exergy, standard enthalpy and chemical compositions of fuels, the theory was also studied to connect the element composition and the energy and energy grade characteristic of fuels. What’s more, the calculation models were explored to illustrate the correlation theory. Finally, the data of standard enthalpy, standard exergy and standard energy grade of a series of conventional fuels could be obtained, such as low rank coal, shale oil, cellulosic fuel, biomass fuel, garbage, biogas and so on. The energy and energy grade analysis of typical energy system was carried out consequently..This project is expected to provide the data and methodology basic support for the development of complex composition fuels in the frontier of Engineering Thermodynamics, and for the sustainable utilization of fuels and the diversification of energy supply side structure during the period of 13th Five-Year in China.