IECM 12.0 beta User Manual > Modules Included with the IECM > Pulverized Coal (PC) Plant > SET PARAMETERS > CO2 Capture, Transport & Storage > 1. Ammonia System >

Config

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Inputs for the configuration of the ammonia system in PC and NGCC plants are entered on the Config parameter screen. The following parameters are available:

•System Used: The type of absorber used. Ammonia is currently the only option.

•Auxiliary Gas Boiler?: An auxiliary natural gas-fired boiler can be added to the amine system. When used, the original steam cycle of the power plant remains undisturbed and the net power generation capacity of the power plant is not adversely affected. The auxiliary boiler comes at an additional cost of capital requirement for the boiler (and turbine) and the cost of supplemental fuel. Also, the auxiliary boiler adds to the CO2 and NOx emissions. When an auxiliary boiler is added, an additional process type , Auxiliary Boiler System, is added; both parameters and results are provided. The following options are available:

•None: (This is the default.) An auxiliary gas boiler is not used.

•Steam Only: An auxiliary gas boiler is used to generate low pressure steam for sorbent regeneration.

•Steam + Power: An auxiliary gas boiler is used to generate low pressure steam for sorbent regeneration and separate power for the amine system.

•CO2 Product Compressor Used: A CO2 product compressor is used by default.

•Flue Gas Bypass Control: 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: 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 value 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 above.

•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.