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Similarly, the design of and conditions in the regenerator affect the energy requirement and the overall performance of the system. 3.1. Process Simulation Tool Two process simulators, viz. ASPEN-Plus and ProTreat have been used to derive the performance equations. The CO2 capture and separation model is based on the ProTreat simulations while the CO2 compression model is based on the ASPEN-Plus simulations. • ProTreat is a software package for simulating processes for the removal of H2S, CO2, and mercaptans from a variety of high and low pressure gas streams by absorption into thermally regenerable aqueous solutions containing one or more amines. The ProTreat package makes exclusive use of a column model that treats the separation as a mass transfer rate process. • ASPEN-Plus is a powerful process engineering tool for the design and steady-state simulation and optimization of process plants. 3.2. Methodology A large number of process simulation runs have been conducted to cover a reasonable range of values for the key parameters. The details are presented in the following sections. 3.2.1. ProTreat Simulation Runs for CO2 capture and separation from flue gas The CO2 capture and separation system consists of a flue gas compressor, cooler, absorber, heat exchangers, regenerator, sorbent circulation pumps etc. Many parameters were varied in the ProTreat model. Table 2 summarizes the parameters that were changed and the ranges for each parameter. Table 2. Protreat Parameter Ranges (total number of simulation runs: 1983) No. Parameter 1 CO2 content in flue gas (yCO2) 2 Flue gas flow rate (G) 3 Inlet flue gas temperature (Tfg) 4 MEA concentration (C) 5 Sorbent flow rate (L) 6 L/G 7 Reboiler heat duty (Q) 8 Q/L 9 CO2 capture efficiency 10 CO2 product flow rate 11 Lean sorbent CO2 loading 12 Rich sorbent CO2 loading 13 Absorber diameter 14 Regenerator diameter Type Input Input Input Input Input Input Input Input Output Output Output Output Output Output Units mole % kmole/hr deg C wt % kmole/hr - GJ/hr MJ/kmole % kmole/hr moleCO2/mole MEA moleCO2/mole MEA ft ft Range 3.5-13.5 9000-24000 40-65 15-40 16000-70000 0.73-5.56 95-664 2.4-22.5 41.2-99.9 333-2840 0.05-0.34 0.27-0.55 26-42 12-42 Integrated Environmental Control Model - Technical Documentation • 15PDF Image | Amine Based CO2 Capture
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