IECM 12.0 beta User Manual > Modules Included with the IECM > Integrated Gasification Combined Cycle (IGCC) Plant > SET PARAMETERS > Air Separation Unit >

Performance

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Inputs for the performance of the Air Separation Unit (ASU) are entered on the Performance parameter screen . This screen is available for IGCC plants and oxyfuel systems in PC plants. The following parameters are available:

•Oxidant Composition:

•Oxygen (O2): This is the percent of oxygen that is in the oxidant that is produced by the air separation unit. The value is fixed for the IGCC plant type.

•Argon (Ar): This is the percent of argon that is in the oxidant that is produced by the air separation unit.

•Nitrogen (N2) This is the percent of nitrogen that is in the oxidant that is produced by the air separation unit.

•Final Oxidant Pressure: The final oxidant stream from the ASU can be provided at a high pressure. The default value is determined by the plant type being used.

•Maximum Train Capacity: The maximum production rate of oxidant is specified here. It is used to determine the number of operating trains required.

•Number of Operating Trains: This is the total number of operating trains. It is used primarily to calculate capital costs. The value must be an integer.

•Number of Spare Trains: Thisis the total number of spare trains. It is used primarily to calculate capital costs. The value must be an integer.

•Unit Separation ASU Energy: The main air compressor (MAC) pressurizes atmospheric air to approximately 550 kPA (65 psig). The MAC is a multi-staged, intercooled compressor that can be treated as isothermal. This measures the electric power use per unit of air flow.

•Total Cryogenic ASU Energy: This is the electricity used by the air separation unit for internal use. A majority of the power is used for the main air compressor and a secondary amount used for the product stream compressor (if required). It is expressed as a percent of the gross plant capacity.

When this screen appears in a PC plant, the following input is also included:

•ASU Cool. Duty Recov. as Heat Integration: This is the fraction of cooling duty recovered as heat integration.