文档介绍：12 江苏电机工程
范仲元评估回热加热器热经济性的正确指标 13
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江苏电机工程
Jiangsu Electrical Engi nee ring
第21卷第4期 11
?00?年R月
© 1995-2006 Tsinghua Tongfang Optical Disc Co.. Lid. All rights reserved.
评估回热加热器热经济性的正确指标
范仲元
（南京工程学院•江苏 南京210013）
:在火电厂中•工程技术人贾****惯用加热器的端差来评价回热加热器的热经济性。现今在大容重高参数机 组的再热回热衛环杀统中•当装有独立的抽汽蒸汽冷却器的加热弱或加热器具有内置式过热段时•该加热器的端 差可能会出现负值。用热力学第二定律分析加热器的负值端差•将得到抽汽是被加热介质而给水是加热介质的错 误结论。为此•对装有独立抽汽蒸汽冷却器或具有内置式过热段的回热加热器•建议采用加热器的传热杀数和加 热器有效度作为其经济性的评价指标。
:回热加热器:热经济性:端差:传热温压:加热器有效度:传热乘数
: ;A ;1009 ・ 0665（2002）04 ・ 0011 ・ 03
The Index to Correctly Evaluate Heat Economics of Regenerative Water Efeater
FAN 3)ong-yuan
(Nanjing Institute of Technology .Nanjing 210013. China)
Abstract :In power plant .it is customary to evaluate the heat economics of regenerative water heater by its terminals tenr perature difference .but for regenerative water heater cycle system of moderm large capacity high parameter set Jn which the regenerative water heater with sq)aratc dragout steam cooler or inner siperheat stage is installed 4he terminals tenr perature difference may be negative . if analysing with the Second Law of Thermodynamics • wrong result may be achieved that the dragout steam is heated matter and the feed water is heating matter・ Thus for