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Use of steam jet booster as an integration strategy to operate a natural gas combined cycle with post-combustion CO2 capture at part-load

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  • Apan-Ortiz, Jorge Igor
  • Sanchez-Fernández, Eva
  • González-Díaz, Abigail

Abstract

This paper aims to evaluate the integration of the steam jet booster in a natural gas combined cycle with CO2 capture at low part-load operation. The steam ejector takes a high pressure motive steam flows in a supersonic nozzle while dragging a low pressure steam which comes from the crossover. Both flows mix into one at fixed pressure of 3.5 bar and sent to the reboiler. The results are compared with two integration alternatives: uncontrolled and controlled steam extraction control. Uncontrolled steam extraction provides better part-load performance than controlled. However, with sliding pressure, at 42.3% gas turbine load the low pressure steam turbine operates at 27% of its capacity compared with 66% when the energy plant operates without capture, this imposes a potential risk to the integrity of the turbine. When the steam ejector is integrated, there is no significant improvement in the efficiency compared with sliding pressure strategy. However, the used capacity of the low pressure steam turbine increases from 27% to 42.8%. Therefore, the use of the steam ejector represents a solution to avoid severe damage to the low pressure steam turbine, thus bringing more flexibility, and ensure that steam extraction will not impose any constraint to the energy plant with CO2 capture at part-load.

Suggested Citation

  • Apan-Ortiz, Jorge Igor & Sanchez-Fernández, Eva & González-Díaz, Abigail, 2018. "Use of steam jet booster as an integration strategy to operate a natural gas combined cycle with post-combustion CO2 capture at part-load," Energy, Elsevier, vol. 165(PB), pages 126-139.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pb:p:126-139
    DOI: 10.1016/j.energy.2018.09.148
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    1. González-Díaz, Abigail & Alcaráz-Calderón, Agustín M. & González-Díaz, Maria Ortencia & Méndez-Aranda, Ángel & Lucquiaud, Mathieu & González-Santaló, Jose Miguel, 2017. "Effect of the ambient conditions on gas turbine combined cycle power plants with post-combustion CO2 capture," Energy, Elsevier, vol. 134(C), pages 221-233.
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    Cited by:

    1. Zhang, Hongsheng & Liu, Xingang & Hao, Ruijun & Liu, Chengjun & Liu, Yifeng & Duan, Chenghong & Qin, Jiyun, 2022. "Thermodynamic performance study on gas-steam cogeneration systems with different configurations based on condensed waste heat utilization," Energy, Elsevier, vol. 250(C).

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