Multi-field synergy study of CO2 capture process by chemical absorption

Abstract Carbon dioxide capturing from the flue gas of power stations is an effective way to mitigate the global warming. In order to predict the performance from startup to stable operation in CO 2 absorption process, a multi-field synergy model was developed based on CO 2 capture process in a packed column by means of monoethanolamine (MEA). The model suggests that the integral diffusion–reaction coefficient plays an important role in the diffusion, fluid flow, heat transfer and chemical reaction processes. The influences of the fluid flow, heat transfer and chemical reaction can be justified using corresponding synergy numbers, quantifying multi-field interactive dynamic characteristics of the CO 2 capture process. The simulation shows a good agreement compared with data in the literature. The results show that the packing Reynolds number can be used as a criterion to choose the proper packing. The less the Reynolds number is, the more efficient the reaction absorption is. The average synergy number F dc would be decreased by 20% with 6 K temperature drop and be descended by 7% with the 2.5% solvent weight percentage increment, which improved the efficiency of CO 2 capture by about 5% and 14%, and lowered the energy consumption by about 5%. The average synergy number F dh would be decreased by about 8% with the 0.062 mol/molMEA lean solvent loading increment, which improved the efficiency by about 15% and lowered the energy consumption by 5%. After comparing with CMR-2, Raschig rings, Berl saddles and Pall rings, the 33% less average synergy number F df of the CMR-2 packing with about 5% drop in energy consumption yields the highest efficiency of 71%, which is 10% higher than that of the Berl saddle packing. The results indicate that the proposed multi-field synergy model is an effective way to intensify the capture process as a guideline with the priority of precision and simplicity.

[1]  José Fernández-Seara,et al.  Experimental investigation of mass transfer performance with some random packings for ammonia rectification in ammonia-water absorption refrigeration systems , 2007 .

[2]  A. Górak,et al.  Determination of gas–liquid reaction kinetics with a stirred cell reactor , 2003 .

[3]  Arvo Lannus,et al.  Gas‐Liquid Reactions , 1970 .

[4]  G. Versteeg,et al.  CO2 capture from power plants. Part I: A parametric study of the technical performance based on monoethanolamine , 2007 .

[5]  Andrzej Górak,et al.  Dynamic simulation of industrial reactive absorption processes , 2003 .

[6]  Q. Guo,et al.  Simulations of chemical absorption in pilot-scale and industrial-scale packed columns by computational mass transfer , 2006 .

[7]  Stefano Freguia,et al.  Modeling of CO2 capture by aqueous monoethanolamine , 2003 .

[8]  Hassan Gomaa,et al.  Using in-line static mixers to intensify gas-liquid mass transfer processes , 2005 .

[9]  Bu-Xuan Wang,et al.  A novel concept for convective heat transfer enhancement , 1998 .

[10]  Ross Taylor,et al.  Simulation of packed distillation and absorption columns , 1985 .

[11]  H. M. Kvamsdal,et al.  Dynamic modeling and simulation of a CO2 absorber column for post-combustion CO2 capture , 2009 .

[12]  Peter L. Douglas,et al.  On the operability of power plants with CO2 capture and storage , 2009 .

[13]  H. Herzog,et al.  Scenario analysis of carbon capture and sequestration generation dispatch in the western U.S. electricity system , 2009 .

[14]  Alfons Kather,et al.  Post-combustion CO2-capture from coal-fired power plants: Preliminary evaluation of an integrated chemical absorption process with piperazine-promoted potassium carbonate , 2008 .

[15]  Geert Versteeg,et al.  Diffusion coefficients of several aqueous alkanolamine solutions , 1993 .

[16]  K. Najim.  Modelling and self‐adjusting control of an absorption column , 1991 .

[17]  R. W. Rousseau,et al.  Simulation of continuous-contact separation processes: multicomponent batch distillation , 1988 .

[18]  Axel Meisen,et al.  Predict amine solution properties accurately , 1996 .

[19]  R. Mhaskar,et al.  A dynamic analysis of a packed gas absorber , 1972 .

[20]  Hiroshi Takeuchi,et al.  MASS TRANSFER COEFFICIENTS BETWEEN GAS AND LIQUID PHASES IN PACKED COLUMNS , 1968 .

[21]  Yan Li,et al.  An innovative process for simultaneous removal of CO2 and SO2 from flue gas of a power plant by energy integration. , 2009 .

[22]  Bolun Yang,et al.  Multi-fields synergy in the process of reactive distillation coupled with membrane separation , 2005 .

[23]  K. Najim,et al.  Long-range predictive control of an absorption packed column , 1995 .

[24]  Kiran L. Kadam,et al.  Power plant flue gas as a source of CO2 for microalgae cultivation: Economic impact of different process options , 1997 .

[25]  Gary T. Rochelle,et al.  Rate-based modeling of reactive absorption of CO2 and H2S into aqueous methyldiethanolamine , 1998 .

[26]  Kefa Cen,et al.  Comparative analysis of CO2 separation from flue gas by membrane gas absorption technology and chemical absorption technology in China , 2008 .

[27]  Wen-Quan Tao,et al.  Field synergy principle for enhancing convective heat transfer--its extension and numerical verifications , 2002 .

[28]  Axel Meisen,et al.  CO2 absorption by NaOH, monoethanolamine and 2-amino-2-methyl-1-propanol solutions in a packed column , 1992 .

[29]  J. Wallace,et al.  Development of a Carbon Dioxide Continuous Scrubber (CDOCS) System for Alkaline Fuel Cells , 2006 .

[30]  G. Wozny,et al.  Experimental investigation and simulation of the chemical absorption in a packed column for the system NH3–CO2–H2S–NaOH–H2O , 2004 .

[31]  Sheng H. Lin,et al.  Performance characteristics and modeling of carbon dioxide absorption by amines in a packed column , 1999 .

[32]  Gary T. Rochelle,et al.  Amine Scrubbing for CO2 Capture , 2009, Science.

[33]  R. M. Wellek,et al.  Enhancement factors for gas‐absorption with second‐order irreversible chemical reaction , 1978 .

[34]  Jong-Hyeon Jung,et al.  Removal characteristics of CO2 using aqueous MEA/AMP solutions in the absorption and regeneration process. , 2009, Journal of environmental sciences.

[35]  Wei Zhang,et al.  Three-dimensional numerical study of heat transfer characteristics of plain plate fin-and-tube heat exchangers from view point of field synergy principle , 2005 .

[36]  Matthew Leach,et al.  Flexible Operation of Coal Fired Power Plants with Postcombustion Capture of Carbon Dioxide , 2009 .

[37]  H. Hikita,et al.  Absorption of carbon dioxide into aqueous monoethanolamine solutions , 1979 .

[38]  Jan Tobiś.  A hybrid method of turbulent flow modelling in packings of complex geometry , 2008 .

[39]  A. Szász,et al.  Strong synergy of heat and modulated electromagnetic field in tumor cell killing , 2009, Strahlentherapie und Onkologie.