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

Jorge Igor Apan-Ortiz, Eva Sanchez Fernandez, Abigail González-Díaz

Research output: Contribution to journalArticle

2 Citations (Scopus)
14 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)126-139
Number of pages14
JournalEnergy
Volume165
Issue numberPart B
Early online date24 Sep 2018
DOIs
Publication statusPublished - 15 Dec 2018

Keywords

  • CO capture
  • Control strategy
  • Natural combined cycle
  • Part-load
  • Steam ejector
  • Steam extraction

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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