基于卡必醇醋酸酯的IGCC碳捕集流程模拟与分析
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摘要
碳捕集和封存技术依然为解决碳减排的主要途径。文中采用Aspen Plus软件,验证了工业碳捕集Selexol流程模型可靠性,模拟了基于新型吸收剂卡必醇醋酸酯的IGCC碳捕集流程。该流程作灵敏度分析给出吸收剂流量,以及吸收塔入塔温度的优化结果分别为4 191.6 kmol/h和272.04 K。将此流程与Selexol流程相比,此流程的吸收剂流量及系统总能耗均有所降低,特别是CO_2分离能耗降低了14.28%。新流程考虑将三级闪蒸罐分离出的CO_2气体直接排空,其余不变。当净化气CO_2摩尔分率均为1.5%时,发现新流程碳捕集率仍保持较高值85.69%,系统总能耗及吨CO_2能耗比之前分别下降了26.53%和17.16%。结论表明此流程具有进一步的探索意义及研究价值。
Carbon capture and storage technology still seems to be the main method for carbon emission reduction.The reliability of Selexol process,which was typical carbon capture process in industry,was validated with Aspen Plus software. Then process simulation and sensitivity assessment were finished for IGCC plant with novel absorbent,carbitol acetate. The optimized results of absorbent flow and absorbent temperature are respectively 4 191. 6 kmol/h and 272. 04 K. The absorbent flow and the total energy of this process are less than those of the Selexol process. Energy of this process that used for CO_2 separation is especially 14. 28% less than that of Selexol process. In addition,CO_2 that came from the third flashing tank is evacuated directly to atmospheric instead of captured,otherwise unchanged in the new process. Energy of new process was compared with that of old process when mole fraction of CO_2 for purified gas retained 1. 5%. The sum energy and energy of new process for per ton CO_2 are 26. 53% and 17. 16% less than those of old process respectively,and the carbon capture rate of new process retains as high value as 85. 69%. The above conclusion shows that this process is of developing prospect and research value to carbon capture.
Carbon capture and storage technology still seems to be the main method for carbon emission reduction.The reliability of Selexol process,which was typical carbon capture process in industry,was validated with Aspen Plus software. Then process simulation and sensitivity assessment were finished for IGCC plant with novel absorbent,carbitol acetate. The optimized results of absorbent flow and absorbent temperature are respectively 4 191. 6 kmol/h and 272. 04 K. The absorbent flow and the total energy of this process are less than those of the Selexol process. Energy of this process that used for CO_2 separation is especially 14. 28% less than that of Selexol process. In addition,CO_2 that came from the third flashing tank is evacuated directly to atmospheric instead of captured,otherwise unchanged in the new process. Energy of new process was compared with that of old process when mole fraction of CO_2 for purified gas retained 1. 5%. The sum energy and energy of new process for per ton CO_2 are 26. 53% and 17. 16% less than those of old process respectively,and the carbon capture rate of new process retains as high value as 85. 69%. The above conclusion shows that this process is of developing prospect and research value to carbon capture.
引文
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[2]桂霞,汤志刚,费维扬,等.高压下CO2在几种物理吸收剂中的溶解度测定[J].化学工程,2011,39(6):55-58.
[3]DESCAMPS C,BOUALLOU C,KANNICHE M.Efficiency of an integrated gasification combined cycle(IGCC)power plant including CO2removal[J].Energy,2008,33(6):874-881.
[4]PENNLINE H W,LUEBKE D R,JONES K L,et al.Progress in carbon dioxide capture and separation research for gasification-based power generation point sources[J].Fuel Processing Technology,2008,89(9):897-907.
[5]LI Yun,HUANG Weijia,ZHENG Danxing,et al.Solubilities of CO2capture absorbents 2-ethoxyethyl ether,2-butoxyethyl acetate and 2-(2-ethoxyethoxy)ethyl acetate[J].Fluid Phase Equilibria,2014,370:1-7.
[6]李云,黄维佳,郑丹星,等.基于COSMO-RS方法整体煤气化联合循环碳捕集物理吸收剂的评选[J].北京化工大学学报:自然科学版,2014,41(4):26-31.
[7]程能林.溶剂手册[M].4版.北京:化学工业出版社,2008.
[8]孙兰义.化工流程模拟实训-Aspen Plus教程[M].北京:化学工业出版社,2012.
[9]秦莉,史贤林,李玉安.低温甲醇洗吸收塔工艺模拟与过程参数优化[J].安徽化工,2010,36(3):51-53.
[10]迟金铃,肖云汉,张士杰.IGCC电站二氧化碳捕集研究[D].北京:中国科学院工程热物理研究所,2011.
[11]CHEN Chao.A technical and economic assessment of CO2capture technology for IGCC power plants[D].Pittsburgh:Carnegie Mellon University,2005.
[12]BLACK W B,PRITCHARD V,HOLIDAY A,et al.Use of Selexol process in coke gasification to ammonia project by presented at the Laurance Reid Conditioning Conference[C].Norman:The University of Oklahoma,2000.
[13]王丁.用UNIFAC法研究碳酸二甲酯合成体系的气液平衡[D].武汉:武汉工程大学,2012.
[14]POLING B,PRAUNITZ J,O’CONNELL J.The properties of gases and liquids(fifth edition)[M].New York:Mc Graw-Hill Book Company,2000.
[15]GARCIA G O,DOUGLAS P,CROISET E,et al.Technoeconomic evaluation of IGCC power plants for CO2avoidance[J].Energy Conversion and Management,2006,47(15/16):2250-2259.
[16]亢万忠.低温甲醇洗工艺与NHD、苯菲尔组合工艺技术经济比较[J].化肥工业,1999,26(3):3-6.
[17]MOHAMED K,CHAKIB B.CO2capture study in advanced integrated gasification combined cycle[J].Applied Thermal Engineering,2007,27(16):2693-2702.