ANALYSIS AND IMPROVEMENT OF SEALING WATER LEAKAGE PROBLEM FROM SHAFT END OF STEAM-DRIVEN FEED-WATER PUMP OF SUPERCRITICAL 600 MW UNIT

ZHU Chao-yangZheneng Lanxi Power Generation Co Ltd

doi:10.19666/j.rlfd.2009.03.019

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ANALYSIS AND IMPROVEMENT OF SEALING WATER LEAKAGE PROBLEM FROM SHAFT END OF STEAM-DRIVEN FEED-WATER PUMP OF SUPERCRITICAL 600 MW UNIT

Thermal Power Generation Vol. 38, Issue 3, Pages: 78-80(2009)

更新时间：2025-09-28

- ANALYSIS AND IMPROVEMENT OF SEALING WATER LEAKAGE PROBLEM FROM SHAFT END OF STEAM-DRIVEN FEED-WATER PUMP OF SUPERCRITICAL 600 MW UNIT
- 作者机构：
  
  浙能兰溪发电有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.2009.03.019
  CLC： TM621
- Published：2009
- 稿件说明：
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ZHU Chao-yangZheneng Lanxi Power Generation Co Ltd. ANALYSIS AND IMPROVEMENT OF SEALING WATER LEAKAGE PROBLEM FROM SHAFT END OF STEAM-DRIVEN FEED-WATER PUMP OF SUPERCRITICAL 600 MW UNIT[J]. Thermal Power Generation, 2009, 38(3): 78-80.
DOI：

ZHU Chao-yangZheneng Lanxi Power Generation Co Ltd. ANALYSIS AND IMPROVEMENT OF SEALING WATER LEAKAGE PROBLEM FROM SHAFT END OF STEAM-DRIVEN FEED-WATER PUMP OF SUPERCRITICAL 600 MW UNIT[J]. Thermal Power Generation, 2009, 38(3): 78-80. DOI： 10.19666/j.rlfd.2009.03.019.

摘要

某电厂装有4台超临界600 MW机组

每台机组配备2台50%额定蒸发量的SULZER汽动给水泵(汽泵)

该汽泵运行时

多次发生轴端密封漏水现象

造成给水泵汽轮机及汽泵油系统进水

导致油质恶化

严重影响给水泵汽轮机及汽泵的安全运行。通过实施拆除密封水回水多级U型管、改用收集水箱并加装水箱水位自动调节装置、减少管道流动阻力、减小螺旋密封间隙、降低轴承室负压等多种改造措施

消除了轴端密封漏水故障

确保了机组的正常运行。

Abstract

Four supercritical 600 MW units have been installed in one power plant

and two steam-driven feed-water pumps with 50% rated evaporating capacity being equiped for each unit.During operation of said pumps

the phenomenon of sealing water leakage problem has occurred many times

resulting in entrance of water into oil system of the small turbine and the steam-driven pumps

leading to deterioration of oil quality

affecting seriously safe operation of the small turbine and steam-driven pumps.Through rafrofit measures

such as demolishing multi-stage U_shaped tubes of backwater from sealing water

replacing them with water-collecting tank

installing automatic regulating system of water-level in the water tank

reducing flow resistance in the pipeline

adjusting sealing gap of the screw to a small value

and lowering negative pressure in the bearing chamber etc.

the trouble of sealing water leakage from shaft end has been finally eliminated

ensuring normal operation of the units.

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WANG Jia-xing1

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DONG Ling1

ZHANG Jun-tao1

ZHENG Min21.College of Control Science and Engineering

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YANG Pei-chengHenan Electric Power Construction and Debugging Institute

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