11/8/2022 0 Comments Istripper models full show![]() Due to the interaction between operating parameters, the solid recirculating rate must be optimized to achieve high sorption capacity. Superficial gas velocity is the crucial operating parameter, which provides a significant positive trend on CO 2 sorption capacity. The semi-continuous mode of the reactor is employed to screen out the effect of operating parameters by ANOVA analysis. The circulating fluidized bed reactor can be used to capture CO 2 continuously by performing three different processes: CO 2 sorption in riser, gas-solid separation in cyclone, and sorbent regeneration in downer. Besides lower energy requirements, a reduction of up to 6% in specific water cooling load is expected from the phase-changing absorbents compared to MEA capture, in particular for cases with high CO2 concentrations in the flue gas. However, as the level of maturity of phase-changing absorbents is certainly lower than MEA capture, higher uncertainty in performance is expected. Results indicate that depending on the flue gas conditions, the specific equivalent work necessary for operating phase-changing absorbents is expected to be up to 40% lower than for MEA capture. ![]() This investigation compared the performance of phase-changing absorbents to state-of-the-art monoethanolamine (MEA) capture for three different flue gas conditions with CO2 concentrations ranging from 4 mole% to 13 mole%. One technology that is currently the focus of significant research effort is phase-changing absorbents for post-combustion capture applications. GE is actively investigating and developing novel technologies for both capturing and compressing CO2 from power plants with potential lower energy requirements and environmental impact than state-of-the-art processes. ![]() Most energy scenarios suggest carbon capture and storage (CCS) from power generation might contribute to reduce the carbon emissions necessary to stabilize the long-term global average atmospheric temperature. The stripper can be operated at any convenient pressure at which steam can be extracted from the power plant. The reboiler duty has also been expressed in terms of equivalent work that can calculate the output from the turbines in the power plant. The results show that energy savings of 29%-33% can be achieved by using 5m K+/2.5m PZ over MEA at a stripper pressure of 160 kPa with a 5☌ temperature approach. This model can be used to simulate stripper performance for a variety of solvents and operating conditions (e.g., pressure, approach temperature, rich and lean loading). ![]() This chapter presents a study in which a model was developed to estimate the steam requirements for stripping CO2 from two aqueous solvents, 7m monoethanolamine (MEA) and 5m K+/2.5m piperazine (PZ). The steam requirement for stripping is estimated to be about 20% –40 % of the power plant output. The growing interest in CO2 capture from large point sources, offers another opportunity for the use of this technology. Aqueous amines have been the conventional method for CO2 removal in ammonia, natural gas and refinery streams for decades. Publisher Summary Aqueous absorption/stripping is a technology for CO2 capture from a flue gas. ![]()
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