Heating Feedwater of Thermal Power Units Using Jet Heat Pump

doi:10.7652/xjtuxb201311005

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Heating Feedwater of Thermal Power Units Using Jet Heat Pump

更新时间：2025-07-09

- Heating Feedwater of Thermal Power Units Using Jet Heat Pump
- Vol. 47, Issue 11, Pages: 25-28+47(2013)
- 作者机构：
  
  广东电网公司电力科学研究院,广州,510080
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201311005
  CLC： TK262
- Online First：10 November 2013，
  
  Published：2013
- 稿件说明：
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Heating Feedwater of Thermal Power Units Using Jet Heat Pump[J]. 2013, 47(11): 25-28+47.
DOI：

Heating Feedwater of Thermal Power Units Using Jet Heat Pump[J]. 2013, 47(11): 25-28+47. DOI： 10.7652/xjtuxb201311005.

摘要

为了解决低负荷运行时锅炉给水温度下降的问题

在回热系统中引入喷射式热泵

再利用主蒸汽引射压力回热抽汽

使混合蒸汽进入低负荷加热器后为给水加热

以提高给水温度。研究发现:当引射比增加时

混合蒸汽压力逐渐下降

且存在使机组热效率最高的最佳引射比; 对于某660 MW超临界空冷机组的60%负荷工况

最佳引射比为0.65

给水温度提高36.4 ℃

机组发电煤耗率下降1.2 g/(kW·h); 在最佳引射比附近

当引射比变化时

系统节能效果变化比较平缓。系统设计时

根据脱硝装置的要求

考虑低负荷加热器的成本

合理选择引射比可获得最佳的经济性及节能减排效果。

Abstract

The feedwater temperature of thermal power units always decreases with the electricity load. In order to solve this problem

an ejector heat pump has been integrated with a regenerative system in this study. The live steam is used to inject the extraction steam of the regenerative system

and then the mixture steam is led to an added heater(low load condition heater)to heat the feedwater. The results of our study show that the pressure of the mixture steam decreases with an increase in the entrainment ratio

and an optimum entrainment ratio exists. For a 660 MW supercritical air cooling unit

when the load ratio is 60%

the optimum entrainment ratio is 0.65 and the feedwater temperature rises by 36.4 ℃

and the standard coal consumption rate decreases by 1.2 g/(kW·h). When the value of the entrainment ratio approaches the optimum value

the energy-saving effect changes gently with the change in the entrainment ratio. Our results indicate that the requirement of the selective catalytic reduction(SCR)devices and the cost of the low load condition heater should be comprehensively considered in choosing the entrainment ratio so as to achieve the optimum technique-economics and energy-saving effect when the systems are designed.

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references

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