基于?分析的热电联产能耗一致性评价方法
Unified Evaluation Method of Cogeneration Energy Consumption Based on Exergy Analysis
张艺晨 1戈志华 1杨勇平 1杨志平1
作者信息
- 1. 电站能量传递转化与系统教育部重点实验室(华北电力大学),北京市 昌平区 102206
- 折叠
摘要
现有热电联产能耗评价"好处归热"或"好处归电",将节能效益单一划分给发电或供热,不能合理反映热、电两种能量的品位差异.为弥补上述不足,将蒸汽划分为凝汽流和供热流,把循环㶲损失依据产生根源分摊到发电和供热上,通过㶲分析建立电、热产品定量统一表征方法和电热能耗一致性表达式.用能质系数简化动态过程计算,将基于㶲分析的热电联产单耗分析模型拓展至描述电热能耗的时空分布.通过实际案例验证新算法合理性.结果表明:供热流向热网水释放的㶲与循环㶲损失构成供热量;热电联产通过回收冷源㶲供热和能质匹配实现发电侧和供热侧节能.能耗一致性评价方法可合理反应电热两种产品的能量品位,揭示热电联产发挥节能潜力的途径.
Abstract
Current cogeneration energy consumption evaluation methods simply allocate the energy saving benefits to power generation or heating.The difference of the quality of electric and heat cannot be reflected.To make up deficiencies of current evaluation methods,we divide the steam into condensing steam and heating steam.The cycle exergy loss is allocated to power generation and heating according to the source.Through exergy analysis,we establish the unified expression of cogeneration product and cogeneration energy consumption.The energy quality coefficient is introduced to simplify the calculation process of energy consumption.The cogeneration specific fuel consumption analyzing model based on exergy analysis is expanded to describe the time and spatial distribution of energy consumption.The rationality of new method is verified by example.The result shows that the exergy is released to supply water and the cycle exergy loss of heating steam constitute heat load.Cogeneration realizes energy saving in power generation and heating by recovering cold source exergy and matching the quality and quantity of energy.The unified energy consumption calculation method can reflect the quality of electric and heat and reveal the way of exerting energy saving potential.
关键词
一致性评价方法/热电分摊/㶲分析/能质系数/能质匹配/冷源㶲Key words
unified evaluation method/heat-electric allocation/exergy analysis/energy equality coefficient/energy quality matching/cold source exergy引用本文复制引用
基金项目
国家重点研发计划(2020YFB0606202)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据