基于太阳能集热技术的火电厂CO_2捕集系统性能研究  

Study of the Performance of a CO_2 Capturing System Based on the Solar Energy Heat Collection Technology

作　　者：陈海平[1] 于鑫玮[2] 鲁光武[2] 

机构地区：[1]华北电力大学能源动力与机械工程学院,国家火力发电工程技术研究中心,北京102206 [2]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《热能动力工程》2013年第6期644-649,665-666,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：针对燃煤电厂CO2捕集技术的高能耗问题,阐述了新型抛物面槽式太阳能集热系统、胺基CO2捕集系统与燃煤机组热力系统的耦合机理,基于等效焓降法理论,针对300MW燃煤机组计算分析了各个集成方案的热经济性,得出了太阳能供能条件下,拥有胺基CO2捕集系统的机组热经济性变化规律以及扩容蒸发器中疏水与再沸器饱和水的最佳回水位置及其规律。结果表明,当预热段进口水引自凝结水泵出口时,机组循环热效率随碳捕捉率的增加而提高,当预热段进口水引自给水泵出口时,与之相反;扩容蒸发器及再沸器饱和水的最佳回水位置为机组主凝结水管路6号加热器出口,预热段由凝结水泵出口引入水份额为40%时,节省标煤耗率0.31 g/(kW·h),碳捕捉率达43.86%。In the light of the high energy consumption of the carbon dioxide capturing technology in coal-fired power plants,described was the mechanism governing the coupling among a novel type parabolic trough solar energy heat collection system,amidogen carbon dioxide capturing system and thermal system for a coal-fired power generator unit. Based on the equivalent enthalpy drop method theory,the thermal cost-effectiveness of various integration versions were calculated and analyzed of a 300 MW coal-fired power generator unit. In this connection,the variation law governing the thermal cost-effectiveness of the unit in an amidogen carbon dioxide capturing system and the optimum water returning location and law of the drain water in the flash vaporizer and saturated water from the reboiling vaporizer were obtained. It has been found that when the inlet water of the preheated section is introduced from the outlets of the condensate pumps,the cyclic thermal efficiency of the unit will increase with an increase of the carbon capturing rate. When the inlet water of the preheated section is introduced from the outlets of the feedwater pumps,on the contrary,the optimum water returning location of the saturated water from both flash vaporizer and reboiling one lies in the outlet of the heater No. 6 in the main condensate water pipeline of the unit. When the proportion of the water introduced from the outlets of the condensate pumps in the preheated section was 40%,the standard coal consumption rate saved was 0. 31 g / kw. h and the carbon capturing rate attained 43. 86%.

关 键 词：CO2捕集 太阳能集热系统 等效焓降法 热经济性 

分 类 号：TM615[电气工程—电力系统及自动化]