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

Abstract

Integrated gasification combined cycle (IGCC) systems are a promising technology for power generation. They include an air separation unit (ASU), a gasification system, and a gas turbine combined cycle power block, and feature competitive efficiency and lower emissions compared to conventional power generation technology. IGCC systems are not yet in widespread commercial use and opportunities remain to improve system feasibility via improved process integration. A process simulation model was developed for IGCC systems with alternative types of ASU and gas turbine integration. The model is applied to evaluate integration schemes involving nitrogen injection, air extraction, and combinations of both, as well as different ASU pressure levels. The optimal nitrogen injection only case in combination with an elevated pressure ASU had the highest efficiency and power output and approximately the lowest emissions per unit output of all cases considered, and thus is a recommended design option. The optimal combination of air extraction coupled with nitrogen injection had slightly worse efficiency, power output, and emissions than the optimal nitrogen injection only case. Air extraction alone typically produced lower efficiency, lower power output, and higher emissions than all other cases. The recommended nitrogen injection only case is estimated to provide annualized cost savingsmore » compared to a nonintegrated design. Process simulation modeling is shown to be a useful tool for evaluation and screening of technology options. 27 refs., 3 figs., 4 tabs.« less

Authors:
;  [1]
  1. North Carolina State University, Raleigh, NC (United States). Department of Civil, Construction, and Environmental Engineering
Publication Date:
OSTI Identifier:
20727733
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science and Technology; Journal Volume: 40; Journal Issue: 5; Other Information: frey@eos.ncsu.edu
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 01 COAL, LIGNITE, AND PEAT; COMBINED-CYCLE POWER PLANTS; COAL GASIFICATION; NITROGEN; INJECTION; POWER GENERATION; GAS TURBINES; DESIGN; PERFORMANCE; COMPUTERIZED SIMULATION; DEMONSTRATION PROGRAMS; MATHEMATICAL MODELS; AIR; SEPARATION EQUIPMENT; EFFICIENCY; TECHNOLOGY ASSESSMENT

Citation Formats

H. Christopher Frey, and Yunhua Zhu. Improved system integration for integrated gasification combined cycle (IGCC) systems. United States: N. p., 2006. Web. doi:10.1021/es0515598.
H. Christopher Frey, & Yunhua Zhu. Improved system integration for integrated gasification combined cycle (IGCC) systems. United States. doi:10.1021/es0515598.
H. Christopher Frey, and Yunhua Zhu. Wed . "Improved system integration for integrated gasification combined cycle (IGCC) systems". United States. doi:10.1021/es0515598.
@article{osti_20727733,
title = {Improved system integration for integrated gasification combined cycle (IGCC) systems},
author = {H. Christopher Frey and Yunhua Zhu},
abstractNote = {Integrated gasification combined cycle (IGCC) systems are a promising technology for power generation. They include an air separation unit (ASU), a gasification system, and a gas turbine combined cycle power block, and feature competitive efficiency and lower emissions compared to conventional power generation technology. IGCC systems are not yet in widespread commercial use and opportunities remain to improve system feasibility via improved process integration. A process simulation model was developed for IGCC systems with alternative types of ASU and gas turbine integration. The model is applied to evaluate integration schemes involving nitrogen injection, air extraction, and combinations of both, as well as different ASU pressure levels. The optimal nitrogen injection only case in combination with an elevated pressure ASU had the highest efficiency and power output and approximately the lowest emissions per unit output of all cases considered, and thus is a recommended design option. The optimal combination of air extraction coupled with nitrogen injection had slightly worse efficiency, power output, and emissions than the optimal nitrogen injection only case. Air extraction alone typically produced lower efficiency, lower power output, and higher emissions than all other cases. The recommended nitrogen injection only case is estimated to provide annualized cost savings compared to a nonintegrated design. Process simulation modeling is shown to be a useful tool for evaluation and screening of technology options. 27 refs., 3 figs., 4 tabs.},
doi = {10.1021/es0515598},
journal = {Environmental Science and Technology},
number = 5,
volume = 40,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2006},
month = {Wed Mar 01 00:00:00 EST 2006}
}