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15 Exhaust flue gas temperature Output deg C 40.4-71.6 The following set of parameters related to the design/configuration of the CO2 capture system were held constant: • Absorber height: 40 ft • Absorber packing: Rasching rings, metallic, 1-inch packing size • Inlet flue gas pressure: 3 psi • Solvent pumping pressure: 30 psi • Number of trays in regenerator: 24 (tray spacing = 2 ft, weir height = 3 inches) 3.2.2. ASPEN-Plus Simulation Runs for CO2 Compression The concentrated CO2 product stream obtained from sorbent regeneration is compressed and dried using a multi-stage compressor with inter-stage cooling. The ASPEN-Plus module used for this simulation consists of 4 stages of compression with inter-stage cooling that deliver the compressed product at 35oC. The compressor efficiency, CO2 product pressure and purity were used as the main control variables. These parameters were varied over the following ranges • Compressor efficiency: 60-100 % • CO2 product pressure: 500-2500 psi • CO2 stream purity: 99-100 % 3.2.3. Regressions using SAS to derive performance equations The IECM uses response-surface models to characterize the performance of various technologies. Simple algebraic equations are derived from the process simulation runs and used as performance equations rather than having a detailed process simulation module inside IECM. The key performance output variables were regressed against all the input variables to obtain linear/ logarithmic relationship among them. The data collected from the process simulation runs was used to carry out these multivariate linear regressions using a statistical package called SAS. Only those variables with significance value greater than 0.9995 were retained in the performance equations. 3.3. Performance Parameters A preliminary model was developed to simulate the performance of a CO2 capture system based on amine (MEA) scrubbing. This CO2 module was then added to an existing coal-based power plant simulation model (called IECM), described later in this section. Basically, there are three types of input parameters to the CO2 performance model: • Parameters from the “reference plant”: These include the flow rate, temperature, pressure and composition of the flue gas inlet to the CO2 absorber, and the gross power generation capacity of the power plant. • Parameters to configure the CO2 system: The CO2 module provides a menu of options from which the user may select a CO2 capture technology, CO2 product pressure, mode and distance of CO2 product transport, and CO2 storage/ disposal method. At this stage, a model of the MEA- Integrated Environmental Control Model - Technical Documentation • 16PDF Image | Amine Based CO2 Capture
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