天然气冷热电联供系统热经济优化研究  

Thermal-Economic Optimization of Natural Gas Combined Cooling Heating and Power System

作　　者：华惠莲 王军[1] 陈玉柱 王登文 HUA Hui-lian;WANG Jun;CHEN Yu-zhu;WANG Deng-wen(Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology,Southeast University,Nanjing,China,Post Code:210096;Nanjing Paruote Solar Energy Co.,Ltd.,Nanjing,China,Post Code:211000)

机构地区：[1]东南大学江苏省太阳能技术重点实验室,江苏南京210096 [2]南京帕偌特太阳能有限公司,江苏南京211000

出　　处：《热能动力工程》2023年第2期26-32,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51736006)。

摘　　要：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[火用]-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[火用]-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[火用]-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.

关 键 词：冷热电三联供 能值分析 [火用]-环境成本 当量污染物排放 

分 类 号：TU833[建筑科学—供热、供燃气、通风及空调工程]