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劉軍強,陳朝輝
(華能威海電廠,山東威海 264205)
摘要:本文分析了威海電廠凝結水係統運行中存在的能源浪費問題和變頻調速的節能原理,探討了使用的A-B PowerFlex7000中壓變頻調速裝置的結構、保護配置和特點及調試中出現的問題處理。通過節能效果分析,表明該中壓變頻器在電力工業中具有廣闊的應用前景。
關鍵詞:凝結水;變頻;A-B;節能
The Application of the A-B Medium Voltage Frequency Converter in Huaneng Weihai Power Plant
Liu Jun-qiang,Chen Zhao-hui
(Huaneng Weihai Power Plant,Weihai 264205,China)
Abstract:This paper analyzes the energy-wasting problem in the operational process of the condensate system in huaneng weihai power plant and the principle of energy saving by the frequency conversion speed regulation.It discusses the structure ,the protection arrangement and the characteristics of the A-B PowerFlex7000 medium voltage frequency conversion speed regulation equipment used in the condensate system,and then it introduces the measures dealt with the problems in the commissioning stage. The results show that the application of the frequency conventer is very beautiful in the electric power industry.
Key words:Condensate Water;Frequency Conversion;A-B;Energy Saving
0、引言
2003年以來我國麵臨著嚴峻的資源壓力,“煤、電、油”全quan麵mian告gao急ji,近jin八ba成cheng省sheng份fen拉la閘zha限xian電dian,能neng源yuan瓶ping頸jing正zheng成cheng為wei製zhi約yue國guo民min經jing濟ji可ke持chi續xu增zeng長chang的de最zui主zhu要yao因yin素su。泵beng與yu風feng機ji是shi全quan國guo通tong用yong的de耗hao電dian量liang較jiao大da的de設she備bei,在zai火huo電dian廠chang中zhong應ying用yong極ji廣guang。據ju統tong計ji,全quan國guo火huo電dian廠chang的de平ping均jun廠chang用yong電dian率lv約yue為wei7%~8%,其中泵與風機的耗電量占廠用電的75%左右。目前我國使用的泵與風機的效率,多數比工業先進國家的同類產品的效率低5%~10%;而泵與風機的實際運行效率普遍比工業先進國家低10%~30%[1]。因此積極開展泵與風機的節能降耗,對於促進國民經濟持續發展、縮小與工業發達國家的差距,提高電力企業經濟效益,增強市場競爭力,都具有現實和深遠的意義。
1、設備概況及存在問題
華能威海電廠二期2×300MW機組為國產引進型N300-16.7/538/538中間再熱凝汽式汽輪機組;凝結水泵為沈陽水泵廠生產9LDTNA-4型,電機為YLS560型,額定功率1000kW,電壓6000V,電流114A,轉速1486r/min。機(ji)組(zu)正(zheng)常(chang)運(yun)行(xing)時(shi),兩(liang)台(tai)凝(ning)結(jie)水(shui)泵(beng)一(yi)台(tai)運(yun)行(xing),一(yi)台(tai)備(bei)用(yong)。當(dang)運(yun)行(xing)泵(beng)故(gu)障(zhang)時(shi),備(bei)用(yong)泵(beng)自(zi)啟(qi)並(bing)投(tou)入(ru)運(yun)行(xing)。凝(ning)結(jie)水(shui)通(tong)過(guo)凝(ning)結(jie)水(shui)泵(beng)升(sheng)壓(ya)後(hou),流(liu)經(jing)各(ge)低(di)壓(ya)加(jia)熱(re)器(qi)和(he)凝(ning)結(jie)水(shui)主(zhu)、副調節閥最後到達除氧器。凝結水主、副調節閥的開度由除氧器實際水位和給定值、給水流量和凝結水流量構成的除氧器水位控製回路(單衝量或三衝量)調節控製。機組正常運行時凝結水主、副調節閥的開度如表1所示。由表1可以看出凝結水泵長期處於極度節流狀態,造成能量大量浪費,效率極低。
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