Config

 

The Config parameter screen allows you to configure the membrane system. The following parameters are available:

•CO2 Absorber:

•System Configuration: The following options are available:

•2-Step w/ Air Sweep: (This is the default.) Two membrane modules are used in the system, in which boiler combustion air is used as sweep gas for one membrane module. The first is a cross-flow membrane module; the permeate stream from this membrane is sent to a cryogenic purification unit for further purification and compression. The second membrane module is a counter-flow membrane with boiler combustion air used as a sweep gas; the permeate stream is recycled back to the boiler.

•NETL 2-Step w/ Sweep: This is a version of the "2-Step w/ Air Sweep" configuration which is based on a 2012 NETL study. It is not a complete model; most performance parameters are read-only, for reference only.

•2-Stage Cascade: Two membrane modules are used to produce a CO2-rich permeate stream.

•Membrane Used: This is the type of membrane used. "Polymer" is currently the only option available.

•CO2 Product Compressor Used?: (Not shown for 2-Step w/ Air Sweep) The CO2 product stream must be compressed into supercritical phase for transport to a sequestration site. This parameter determines whether or not a CO2 product compressor is used. A CO2 product compressor is always used in the "NETL 2-Step w/ Sweep" configuration; this parameter is only shown for reference in that case.

•CO2 Purification Config: (Only shown for 2-Step w/ Air Sweep) This parameter determines the purity of the CO2 product stream. The following options are available:

•Low Purity

•~95% Purity

•99.99% Purity (This is the default.)

•NETL Case 5A

•SO2 Polisher Used?: (Only editable in 2-Stage Cascade) This parameter determines whether or not an SO2 polisher is used to reduce the flue gas SO2 concentration. Standard wet FGD or sprayer units do not reduce the SO2 concentration sufficiently.

•SO2 Polisher Outlet Concentration: (Only shown when an SO2 polisher is used.) This is the SO2 concentration exiting the polisher, if one is in use. This value is used to determine the amount of reagent required. This parameter is only editable in the "2-Stage Cascade" configuration.

•Flue Gas Bypass Control: (Only shown for 2-Stage Cascade) This popup selection menu controls whether or not a portion of the inlet flue gas may bypass the scrubber and recombine with the treated flue gas. Bypass allows the scrubber to operate at full efficiency while allowing some of the flue gas to go untreated. Two choices are available: No Bypass and Bypass. The no bypass option is the default and forces the entire flue gas to pass through the scrubber. The bypass option allows for the possibility of a portion of the flue gas to bypass the scrubber. The amount of bypass is controlled by several additional input parameters described below.

•Flue Gas Bypass: (Only available for 2-Stage Cascade) These parameters control the amount of bypass. They are only displayed if bypass is chosen above:

•Maximum CO2 Removal Efficiency: This parameter specifies the maximum efficiency possible for the absorber on an annual average basis. The value is used as a limit in calculating the actual CO2 removal efficiency for compliance.

•Overall CO2 Removal Efficiency: This is the CO2 removal efficiency required for the entire power plant to meet the CO2 emission constraint set earlier. It is used to determine the actual flue gas bypass.

•Absorber CO2 Removal Efficiency: This is the actual removal efficiency of the absorber alone. It is a function of the CO2 emission constraint and the actual flue gas bypass.

•Minimum Bypass: This specifies the trigger point for allowing flue gas to bypass the scrubber. No bypass is allowed until the allowable amount reaches the minimum level set by this parameter.

•Allowable Bypass: This is the amount of flue gas that is allowed to bypass the scrubber, based on the actual and maximum performance of the CO2 removal. It is provided for reference only. The model determines the bypass that produces the maximum CO2 removal and compares this potential bypass with the minimum bypass value specified above. Bypass is only allowed when the potential bypass value exceeds the minimum bypass value.

•Actual Bypass: This is the actual bypass being used in the model. It is based on all of the above and is provided for reference purposes only.

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