Purification

 

Parameters related to the flue gas purification unit are entered on the Purification parameter screen. The contents of this screen vary depending on which configuration was chosen on the Config screen. This screen looks similar for all configurations except NETL Case 5A. See Purification (NETL Case 5A) for a description of the screen in the NETL Case 5A configuration. For the other configurations, the following parameters are available:

•CO2 Recovery Rate: This is the percentage of CO2 recovered by the purification system. If you have chosen Low Purity, this parameter will be read-only, for reference only. If you have chosen ~95% Purity or 99.99% Purity , this parameter will be editable, and the following additional values will be shown for reference:

•Minimum CO2 Recovery Rate

•Maximum CO2 Recovery Rate

•Actual CO2 Recovery Rate: This is the CO2 recovery rate which will be used by the model. The CO2 recovery rate is required be within the range specified by the previous two parameters. If the value you specified is in range, it will be used. If not, the maximum or minimum value will be used, depending on whether the value you specified is above or below the range.

•CO2 Product Purity: This is the percentage of the product that is carbon dioxide. If you have chosen Low Purity or 99.99% Purity, this parameter will be read-only, for reference only. If you have chosen ~95% Purity , this parameter will be editable, and the following additional values will be shown for reference:

•Minimum CO2 Product Purity

•Maximum CO2 Product Purity

•Actual CO2 Product Purity: This is the CO2 product purity which will be used by the model. The CO2 product purity is required to be within the range specified by the previous two parameters. If the value you specified is in range, it will be used. If not, the maximum or minimum value will be used, depending on whether the value you specified is above or below the range.

•Maximum CO2 Train Capacity: This is the maximum capacity of a CO2 train.

•Number of Trains: This is the number of CO2 trains.

•CO2 Product Pressure: The CO2 product may have to be carried over long distances. Hence it is necessary to compress (and liquefy) it to very high pressures, so that it may be delivered to the required destination in liquid form and (as far as possible) without recompression facilities en route. The critical pressure for CO2 is about 1070 psig. The typically reported value of final pressure to which the product CO2 stream has to be pressurized using compressors, before it is transported is about 2000 psig.

•CO2 Compressor Efficiency: This is the effective efficiency of the compressors used to compress CO2 to the designated pressure.

•Unit CPU Energy: This is the electrical energy required to purify a unit mass of CO2 product stream.

•CPU Energy: This is the total energy required to purify the CO2 product.

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