清洁燃煤热电联产与燃气调峰结合的新型集中供热系统优化  

Optimization Study of a Novel District Heating System Combining Clean Coal-fired Cogeneration With Gas Peak Shaving

作　　者：李岩[1] 王玲玲[1] 张淑彦[1] 许抗吾 LI Yan;WANG Lingling;ZHANG Shuyan;XU Kangwu(Hebei Province Low-carbon and Clean Building Heating Technology Innovation Center(Yanshan University),Qinhuangdao 066004,Hebei Province,China)

机构地区：[1]河北省建筑低碳清洁供热技术创新中心(燕山大学),河北省秦皇岛市066004

出　　处：《中国电机工程学报》2023年第24期9646-9654,共9页Proceedings of the CSEE

基　　金：河北省重点研发计划项目(20374505D)。

摘　　要：我国燃煤为主的能源结构带来了严重的环境问题,因此必须推行清洁高效的集中供热方式。降低热网回水温度,既能拉大供回水温差,降低管网投资和水泵耗电,又能为回收低温余热创造有利工况,可以提升集中供热的可行性。为此,以热水型和燃气型吸收式热泵为基础,构建新型热网大温差换热系统,在大幅降低一次网回水温度的同时,实现了清洁燃煤热电联产和燃气调峰的有机结合。基于此,为提升新系统的综合能效和经济性能,对不同应用条件下的系统关键参数进行优化。与常规热电联产集中供热系统相比,综合?效率提高29.2%,电厂供热能力提高47.5%,单位热量输送综合成本降低18.6%。结果对于构建能效更高、可实施性更强的新型集中供热系统具有一定参考。Coal-based energy structure has resulted in serious pollution in China,so it is necessary to implement a clean and efficient district heating system.Decreasing the return water temperature of the heat network can not only widen the temperature difference between supply and return water,reduce the investment in pipeline network and power consumption of water pumps,but also create a favourable condition for the waste heat recovery of low-temperature,which can enhance the feasibility of the district heating.Therefore,a novel large temperature-difference heat exchange system based on hot water and gas driven absorption heat pumps is constructed,which substantially reduces the primary return water temperature while realizing the combination of clean coal-fired cogeneration and gas peak shaving.Considering the economics of investment and operation of the new heating system,the key parameters of two absorption heat pumps under different working conditions are optimized.Compared with the conventional system,the comprehensive exergy efficiency is improved by 29.2%,the heating capacity of the combined heating and power plant is enhanced by 47.5%,and the comprehensive costs per unit heat output are decreased by 18.6%.The results mentioned above are also used to guide and promote the construction of new district heating systems with a higher energy efficiency and feasibility.

关 键 词：燃煤热电联产 燃气调峰 集中供热 吸收式热泵 大温差换热 综合能效 

分 类 号：TU995[建筑科学—供热、供燃气、通风及空调工程]