Prediction of Back Pressure on Air-Cooled Unit with Effect of Ambient Wind

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Prediction of Back Pressure on Air-Cooled Unit with Effect of Ambient Wind

更新时间：2025-07-09

- Prediction of Back Pressure on Air-Cooled Unit with Effect of Ambient Wind
- Vol. 45, Issue 1, Pages: 15-20(2011)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124
- Online First：10 January 2011，
  
  Published：2011
- 稿件说明：
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Prediction of Back Pressure on Air-Cooled Unit with Effect of Ambient Wind[J]. 2011, 45(1): 15-20.
DOI：

Prediction of Back Pressure on Air-Cooled Unit with Effect of Ambient Wind[J]. 2011, 45(1): 15-20. DOI：

摘要

通过加载冷空气与翅片管换热器内汽轮机排汽凝结换热程序

提出了一种直接空冷单元运行背压的预测方法

并用该方法模拟了环境风影响下空冷单元的运行性能

得到了不同风速和风温下空冷单元的运行背压.计算结果表明:空冷单元风机风量随着环境风速的上升而下降

当环境风速由0 m/s上升至12 m/s时

风机风量由476.9 m

/s下降至328.6 m

下降幅度达到20.5%

计算换热量由15.86 MW下降至12.45 MW

相应的运行背压由21.5 kPa上升至62.5 kPa; 环境风温的变化将改变换热的冷端进口温度

当环境风温由290 K上升至306 K时

换热量由16.36 MW下降至15.43 MW

相应的空冷单元运行背压由12 kPa上升至25 kPa.所提方法为空冷电厂空冷凝汽器运行背压的预测提供了理论基础

对直接空冷电厂的设计具有指导意义.

Abstract

A method to predict the operating back pressure for an air-cooled unit was proposed by adding the program for condensation heat transfer between the cold air and steam turbine exhaust in the finned tube exchangers. The performance of the air-cooled unit under windy conditions was simulated

and operating back pressures under different windy speeds and temperatures were predicted with the present method. The result shows that the fan flow rate of the air-cooled unit drops from 476.9 m

/s to 328.6 m

/s when the wind speed increases from 0 m/s to 12 m/s. The heat transfer rate also drops from 15.86 MW to 12.45 MW

and the corresponding operating back pressure rises from 21.5 kPa to 62.5 kPa. In addition

the heat transfer rate drops from 16.36 MW to 15.43 MW and the operating

back pressure rises from 12 kPa to 25 kPa when the wind temperature increases from 290 K to 306 K.

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references

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