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Improved system integration for integrated gasification combined cycle (IGCC) systems.

H Christopher Frey1, Yunhua Zhu

  • 1Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Campus Box 7908, Raleigh, North Carolina 27695-7908, USA. frey@eos.ncsu.edu

Environmental Science & Technology
|March 30, 2006
PubMed
Summary

Integrated gasification combined cycle (IGCC) systems offer efficient, low-emission power generation. Optimal integration using nitrogen injection with elevated pressure air separation units (ASUs) enhances efficiency and power output, reducing costs.

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Area of Science:

  • Energy engineering
  • Chemical engineering
  • Environmental science

Background:

  • Integrated Gasification Combined Cycle (IGCC) systems represent an advanced power generation technology.
  • IGCC systems integrate an air separation unit (ASU), gasification, and combined cycle power block for improved efficiency and reduced emissions over conventional methods.
  • Widespread commercial adoption of IGCC is limited, highlighting the need for enhanced process integration to improve system feasibility.

Purpose of the Study:

  • To develop and apply a process simulation model for IGCC systems.
  • To evaluate various ASU and gas turbine integration schemes.
  • To identify optimal integration strategies for improved performance and cost-effectiveness.

Main Methods:

  • Development of a process simulation model for IGCC systems.

Related Experiment Videos

  • Evaluation of integration schemes including nitrogen injection, air extraction, and their combinations.
  • Analysis of different air separation unit (ASU) pressure levels.

    • Main Results:

    • The optimal nitrogen injection-only case with an elevated pressure ASU demonstrated the highest efficiency and power output.
    • This optimal case also achieved the lowest emissions per unit output among all evaluated configurations.
    • Air extraction alone resulted in lower efficiency, power output, and higher emissions compared to other integration strategies.

    Conclusions:

    • Nitrogen injection with elevated pressure ASUs is a recommended design option for IGCC systems.
    • Process simulation modeling is an effective tool for evaluating and selecting IGCC technology options.
    • The recommended IGCC design offers potential annualized cost savings over non-integrated systems.