为了更好地理解能源系统在热力学、经济和生态方面的性能机制，提出了天然气和地热能耦合利用的冷热电联供系统，主要动力单元为内燃机，其高温烟气分别进入有机朗肯循环（ORC）和吸收式热泵进行梯级利用，末端烟气通入余热换热器制生活热水。以北京某宾馆为案例，建立了系统的仿真模型，提出了一种基于能值的〖HT5”，7〗火〖KG-*3〗用〖HT5”〗-环境成本分析法，从生态角度考虑了整个生命周期链的当量排放，以系统单位〖HT5”，7〗火〖KG-*3〗用〖HT5”〗-环境成本最优为目标，对高温烟气分配比例进行优化，对各过程的能值消耗进行了评价。研究表明：当来自内燃机63%的高温烟气进入ORC机组时，系统的单位〖HT5”，7〗火〖KG-*3〗用〖HT5”〗-环境成本最小，为310 050 seJ/J；此时内燃机和吸收式热泵占据了该系统98%的能值消耗。

To better understand the performance mechanism of energy systems in respect to thermodynamic，economic and ecological factors，a combined cooling，heating and power (CCHP) system for coupling utilization of natural gas and geothermal energy is proposed. The main power unit of the system is internal combustion engine (ICE)，whose exhaust gas is split between an organic Rankine cycle unit and absorption heat pump (AHP) for energy cascade utilization，and the end flue gas enters the waste heat exchangers to produce domestic hot water. Taking a hotel in Beijing as an example，a simulation model of the system is constructed and an emergybased exergoenvironmental cost method is proposed considering the high temperature equivalent emissions of the whole lifecycle chain from an ecological view. The high temperature exhaust gas allocation ratio is optimized with the optimal specific exergoenvironmental cost of system and emergy consumption of each process is evaluated. The results show that the minimize specific exergoenvironmental cost of system is 310 050 seJ/J when 63% of the high temperature exhaust gas from ICE flows to the ORC unit; the ICE and AHP account for 98% of the emergy consumption of the system.

TU833

国家自然科学基金（51736006）