Analysis on Energy Saving Effect of Low-Pressure Economizer in Boiler Under Multi-variable Factors

Xuedong WANG; Zhaowei ZHONG; Yang DONG; Tongbing ZHU

doi:10.12096/j.2096-4528.pgt.2018.022

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Analysis on Energy Saving Effect of Low-Pressure Economizer in Boiler Under Multi-variable Factors

Power Generation and Environmental Protection | 更新时间：2025-07-04

- Analysis on Energy Saving Effect of Low-Pressure Economizer in Boiler Under Multi-variable Factors
- Power Generation Technology Vol. 39, Issue 2, Pages: 140-145(2018)
- 作者机构：
  
  1.华电电力科学研究院有限公司, 浙江省杭州市 310030
  2.华电龙口发电股份有限公司, 山东省龙口市 265700
- 作者简介：
- 基金信息：
- DOI：10.12096/j.2096-4528.pgt.2018.022
  CLC：
- Received：27 October 2017，
  
  Published：28 April 2018
- 稿件说明：
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Xuedong WANG, Zhaowei ZHONG, Yang DONG, et al. Analysis on Energy Saving Effect of Low-Pressure Economizer in Boiler Under Multi-variable Factors[J]. Power Generation Technology, 2018, 39(2): 140-145.
DOI：

Xuedong WANG, Zhaowei ZHONG, Yang DONG, et al. Analysis on Energy Saving Effect of Low-Pressure Economizer in Boiler Under Multi-variable Factors[J]. Power Generation Technology, 2018, 39(2): 140-145. DOI： 10.12096/j.2096-4528.pgt.2018.022.

摘要

在多变量因素条件下测试了某220MW机组低压省煤器的节能效果，用等效焓降法计算了低压省煤器不同运行方式、不同运行参数下的节能效果。针对200 MW容量等级的机组，当低压省煤器进水流量较大和进水温度稍高时，应优先采用6号低加出水，220 MW工况下，进低压省煤器最佳流量为250 t/h左右，机组热效率提高0.645%；若低压省煤器进水来自于7号、8号低加出口，进水温度较低，则低压省煤器出水应引至6号低加出口，并应使低压省煤器出水温度略高于6号低加出口水温，否则，节能效果相比最佳工况降低，220 MW试验工况下，从8号低加和7号低加出口抽取凝结水370 t/h，经低压省煤器加热后回水至6号低加出口，机组热效率提高2.003%。对不同的低压省煤器运行方式，都存在一个最佳回水位置和最佳进水流量。

Abstract

The energy saving effect of low-pressure(LP) economizer of a 220 MW unit was tested under multivariate factors. Using equivalent enthalpy method

the energy saving effect of LP economizer at different operation modes and different operating parameters has been calculated. For 200MW grade units

when it is necessary to have higher water flow rate and inlet temperature of LP economizer

the condensate water from NO.6 LP heater outlet should be used priority. Under the condition of 220 MW

the optimal flow rate into LP economizer is about 250 t/h

increasing thermal efficiency of the unit by 0.645%. If the inlet water is from the outlet of NO.7 and NO.8 LP heater

the LP economizer inlet temperature is lower

the outlet of the LP economizer should return to the outlet of NO.6 LP heater. And water temperature at LP economizer outlet should be slightly higher than that of NO.6 LP heater outlet. Otherwise

the energy efficiency will decrease compared with the best condition. Under the condition of 220MW

370 t/h condensate water is extracted from outlet of NO.8 and NO.7 LP heater

entering main condensate water pipe at outlet of NO.6 LP heater after heated. The heating efficiency of the unit increases 2.003%. For different LP economizer operation mode

there are an optimal water returning location and optimal inlet flow.

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references

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