Analysis of the effect of zero-output modification of low-pressure turbine on the flexibility enhancement of coal-fired power plants equipped with carbon capture

LIU Jun; YUAN Xin; CHEN Heng; PAN Peiyuan; XU Gang; WANG Xiuyan

doi:10.19666/j.rlfd.202209207

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Analysis of the effect of zero-output modification of low-pressure turbine on the flexibility enhancement of coal-fired power plants equipped with carbon capture

更新时间：2025-09-28

- Analysis of the effect of zero-output modification of low-pressure turbine on the flexibility enhancement of coal-fired power plants equipped with carbon capture
- Thermal Power Generation Vol. 52, Issue 4, Pages: 34-42(2023)
- 作者机构：
  
  华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202209207
  CLC： X773
- Published：2023
- 稿件说明：
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LIU Jun, YUAN Xin, CHEN Heng, et al. Analysis of the effect of zero-output modification of low-pressure turbine on the flexibility enhancement of coal-fired power plants equipped with carbon capture[J]. Thermal power generation, 2023, 52(4): 34-42.
DOI：

LIU Jun, YUAN Xin, CHEN Heng, et al. Analysis of the effect of zero-output modification of low-pressure turbine on the flexibility enhancement of coal-fired power plants equipped with carbon capture[J]. Thermal power generation, 2023, 52(4): 34-42. DOI： 10.19666/j.rlfd.202209207.

摘要

为研究脱碳对火电机组的影响，建立仿真模型分析了火电机组碳捕集改造常规方案的性能变化，进一步提出了低压缸零出力方案提升机组灵活性。常规方案以中压缸排汽为再沸器热源，低压缸零出力方案切断低压缸进汽。一方面，以300 MW燃煤电站为例，分别对2种方案进行分析；另一方面，以西北某省为研究对象，预测2种方案对全省火电的影响。结果表明：常规方案下机组出力空间由87～300 MW缩减至147～217 MW，额定工况的供电效率由37.32%下降至27.02%，机组最小负荷率约升高至70%；采用低压缸零出力方案时，机组负荷空间被拓宽到47～217 MW，为常规方案的2.44倍；对于所讨论的西北省份而言，常规方案下全省火电出力空间由1 103～3 940 MW缩减至1 875～2 793 MW，低压缸零出力方案下，出力空间被拓宽为550～2 793 MW。

Abstract

To study the effect of decarbonization on thermal power units

a simulation model is established to analyze the performance changes of the conventional scheme of carbon capture retrofitting in thermal power units.Moreover

a zero-output scheme of a low-pressure turbine is further proposed to improve the flexibility of the units.The conventional method uses the exhaust steam of the intermediate-pressure cylinder as the reboiler heat source

and the zero-output scheme of the low-pressure cylinder cuts off the low-pressure cylinder inlet steam. On one hand

the two methods are analyzed separately by taking a 300 MW coal-fired power unit as an example. On the other hand

the effects of the two schemes on thermal power units of the whole province is predicted by taking a province in northwest China as a research object. The results show that

the unit output range under the conventional scheme is reduced from 87～300 MW to 147～217 MW

and the power supply efficiency under rated operating conditions decreases from 37.32% to 27.02%. The minimum unit load ratio increases to about 70%. The unit load range ise widened to 47～217 MW when the zero output scheme of the low-pressure cylinder is adopted

which is 2.44 times of that of the conventional scheme. For the discussed northwestern province

the thermal power output range is reduced from 1 103～3 940 MW to 1 875～2 793 MW under the conventional scheme

and the output range is widened to 550～2 793 MW under the low-pressure cylinder zero output scheme.

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