2009•Proceedings of the CSEERequires access
Research on Off-design Characteristics of Integrated Gasification Combined Cycle System
Jing Wang
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Abstract
The model of 200 MW integrated gasification combined cycle (IGCC) system was established by the software ThermoFlex. The off-design characteristics of 200 MW IGCC system were studied from the point of system and effects of gas turbine’s load, atmosphere circumstance condition and air separation unit (ASU) integrated coefficient (Xas) on characteristics of system were fully discussed. Results show that while in regulation manner of adjusting compressor inlet guide vanes (IGV) angle and keeping turbine inlet temperature (T3) constant to reduce gas turbine’s load, the variety trend of gas turbine exhaust temperature is firstly increased and then declined. System efficiency firstly declines slowly and then declines quickly as gas turbine’s load reducing. Gas turbine power, steam power and system net power all decline as atmosphere temperature increasing. Atmosphere pressure almost has no effect on gas turbine efficiency and system net efficiency when atmosphere temperature is fixed. Increasing Xas can enhance system net efficiency and reduce system net power.