Transient state characteristics of deaerator during RB process of an ultra supercritical 1000MW unit

ZHU Bao; WU Meng; CHEN Liqiang; QIAN Haiping; WANG Chongru; SHENG Deren

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Transient state characteristics of deaerator during RB process of an ultra supercritical 1000MW unit

Thermal Power Generation Vol. 43, Issue 7, Pages: 61-65(2014)

更新时间：2025-09-28

- Transient state characteristics of deaerator during RB process of an ultra supercritical 1000MW unit
- 作者机构：
  
  1. 浙江大学热工与动力系统研究所
  2. 浙江省电力设计院
  3. 国电浙江北仑第三发电有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2014
- 稿件说明：
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ZHU Bao, WU Meng, CHEN Liqiang, et al. Transient state characteristics of deaerator during RB process of an ultra supercritical 1000MW unit[J]. Thermal Power Generation, 2014, 43(7): 61-65.
DOI：

ZHU Bao, WU Meng, CHEN Liqiang, et al. Transient state characteristics of deaerator during RB process of an ultra supercritical 1000MW unit[J]. Thermal Power Generation, 2014, 43(7): 61-65. DOI：

摘要

研究超超临界1 000MW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。

Abstract

The condensate water temperature and quality

temperature and pressure in deaerator

and parameter variation of water pumps were investigated in an ultra supercritical 1 000MW unit during runback(RB)process.The results show that

during the fast load rejection 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 arranging the deaerator

setting the enthalpy of water in the deaerator as the enthalpy value of saturated water corresponding to pressure at middle point of the water tank when calculating the NPSHa values.

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