Study on thermal performance of double-turbine regeneration system in double-reheat unit

QIAO Jiafei; ZHANG Lei; LIU Yinghua; WANG Bingbing; HAO Wei

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Study on thermal performance of double-turbine regeneration system in double-reheat unit

Thermal Power Generation Vol. 46, Issue 8, Pages: 59-63(2017)

更新时间：2025-05-30

- Study on thermal performance of double-turbine regeneration system in double-reheat unit
- 作者机构：
  
  神华国华(北京)电力研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2017
- 稿件说明：
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QIAO Jiafei, ZHANG Lei, LIU Yinghua, et al. Study on thermal performance of double-turbine regeneration system in double-reheat unit[J]. Thermal Power Generation2017, 46(8): 59-63.
DOI：

QIAO Jiafei, ZHANG Lei, LIU Yinghua, et al. Study on thermal performance of double-turbine regeneration system in double-reheat unit[J]. Thermal Power Generation2017, 46(8): 59-63. DOI：

摘要

针对我国二次再热机组回热系统不可逆换热损失大等问题

在典型二次再热机组热力系统分析的基础上

重点分析了新型双机回热系统的热力性能

并将其与无前置蒸汽冷却器(蒸冷器)方案和增设前置蒸冷器方案进行了比较研究。结果表明

前置蒸冷器方案虽然可以降低2、4号高压加热器(高加)的过热度

但本质却是将其不可逆损失转移到了前置蒸冷器中

整个回热系统的?损降低有限。双机回热方案可以改善整个给水系统和除氧器的换热效果

显著降低2—4号高加以及除氧器的抽汽过热度

上述设备?效率均达到0.96以上

总?损比无前置蒸冷器方案降低了53%

比增设前置蒸冷器方案降低了51%。研究结果可为后续提高二次再热回热系统换热质量和机组性能提供借鉴。

Abstract

In view of the high superheat degree of bleeding steam in double-reheat units

thermal performance of high pressure heaters and deaerator was compared among the double-turbine regeneration system

regeneration system without outer steam cooler and regeneration system with outer steam cooler. Study shows that the superheat degree of No.2 and No.4 high pressure heaters is lower in the system with outer steam cooler

but the exergy loss of the whole regeneration system doesn't decline obviously. The result indicates that the superheat degree of No.2 to No.4 high pressure heaters and deaerator decline notably in double-turbine regeneration system

and the exergy efficiency of these heaters are all over 0.96. Compared with the regeneration system without outer steam cooler

the exergy loss in double-turbine regeneration system is reduced by 53%. Compared with the regeneration system with outer steam cooler

the exergy loss in double-turbine regeneration system is reduced by 51%. The results cloud be a reference for improving the regeneration efficiency and unit performance of double-reheat units.

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