热力发电
熱力髮電
열력발전
THERMAL POWER GENERATION
2014年
7期
61-65
,共5页
朱宝%吴猛%陈立强%钱海平%王崇如%盛德仁
硃寶%吳猛%陳立彊%錢海平%王崇如%盛德仁
주보%오맹%진립강%전해평%왕숭여%성덕인
超超临界%1 0 0 0 MW机组%RB过程%除氧器%暂态特性
超超臨界%1 0 0 0 MW機組%RB過程%除氧器%暫態特性
초초림계%1 0 0 0 MW궤조%RB과정%제양기%잠태특성
ultra supercritical%1 000 MW unit%RB process%deaerator%transient state characteristics
研究超超临界1000 MW机组 RB 过程中除氧器系统的暂态试验特性,分析除氧器系统凝结水温度、质量、除氧器温度及压力以及给水泵组的参数变化。结果表明:RB过程中,给水泵组的有效汽蚀余量大幅下降,前置泵有可能发生汽蚀,建议布置除氧器时以RB工况为标准核算前置泵有效汽蚀余量下降值,防止汽蚀现象发生;计算前置泵有效汽蚀余量下降值时,将除氧器水焓值设为水箱中间位置处压力所对应的饱和水焓值。
研究超超臨界1000 MW機組 RB 過程中除氧器繫統的暫態試驗特性,分析除氧器繫統凝結水溫度、質量、除氧器溫度及壓力以及給水泵組的參數變化。結果錶明:RB過程中,給水泵組的有效汽蝕餘量大幅下降,前置泵有可能髮生汽蝕,建議佈置除氧器時以RB工況為標準覈算前置泵有效汽蝕餘量下降值,防止汽蝕現象髮生;計算前置泵有效汽蝕餘量下降值時,將除氧器水焓值設為水箱中間位置處壓力所對應的飽和水焓值。
연구초초림계1000 MW궤조 RB 과정중제양기계통적잠태시험특성,분석제양기계통응결수온도、질량、제양기온도급압력이급급수빙조적삼수변화。결과표명:RB과정중,급수빙조적유효기식여량대폭하강,전치빙유가능발생기식,건의포치제양기시이RB공황위표준핵산전치빙유효기식여량하강치,방지기식현상발생;계산전치빙유효기식여량하강치시,장제양기수함치설위수상중간위치처압력소대응적포화수함치。
The condensate water temperature and quality,temperature and pressure in deaerator, and parameter variation of water pumps were investigated in an ultra supercritical 1 000 MW unit during runback (RB)process.The results show that,during the fast load rej ection process,the NPSHa of feedwater pumps falls by a significant margin and cavitation may occur in the booster pump.Thus,several suggestions were proposed,such as taking the RB condition as the standard to account the NPSHa drop value of booster pump to prevent the cavitation occurring when arran-ging the deaerator,setting the enthalpy of water in the deaerator as the enthalpy value of saturat-ed water corresponding to pressure at middle point of the water tank when calculating the NPSHa values.