摘要
针对燃煤锅炉排烟温度低且含有会产生低温腐蚀成分的特点,提出了一种更适合于回收燃煤锅炉排烟余热的两级循环蒸发有机朗肯循环(ORC)系统.以R123为工质,结合国内某燃煤锅炉尾部排烟参数,建立了该两级循环蒸发ORC系统的热力模型和经济模型,并进行计算分析,与传统一级蒸发ORC系统进行比较.结果表明:就热力性能而言,两级循环蒸发ORC系统的净做功量、净回收效率高于一级蒸发ORC系统,相应的换热面积也更大;就经济性而言,两级循环蒸发ORC系统的发电成本高,但设计使用年限内,年均净收益更丰厚,性价比更高.
For the fact that the temperature of coal-fired boiler flue gas is low and the flue gas contains water vapor and acid vapor that may produce acid corrosion at low temperatures, a two-stage cyclic evaporation ORC system was proposed, which is more suitable for the waste heat recovery from coal-fired boiler flue gas. Taking R123 as the working medium, by referring to the flue gas parameters of a domestic coal- fired boiler, a thermodynamic model and an economic model of the two-stage cyclic evaporation ORC system were set up to calculate and analyze the performance of the boiler, which was then compared with traditional one-stage evaporation ORC system. Results show that, in terms of thermal performance, both the net work and net recovery efficiency of the two-stage cyclic evaporation ORC system are greater than the one-stage evaporation ORC system, which accordingly has larger heat-transfer area. Whereas, in terms of economic performance, the cost of the two-stage cyclic evaporation ORC system is higher in power genera- tion, but its annual income is also higher within designed lifetime, indicating higher performance-to-price ratio of the two-stage cyclic evaporation ORC system.
出处
《动力工程学报》
CAS
CSCD
北大核心
2017年第1期66-72,84,共8页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51376047)
关键词
烟气余热
ORC系统
净回收效率
循环式蒸发器
flue gas waste heat
ORC system
net recovery efficiency
circulation evaporator
