基于氮气保护膜的超临界水氧化系统模拟与经济性分析
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摘要
利用空分装置将空气制成氮气和氧气,以氮气作为保护膜替换水膜反应器中的水膜,可同时解决超临界水氧化系统中氧化剂和蒸发水的消耗。建立基于氮气膜反应器的超临界水氧化(SCWO)系统模拟流程,研究主要运行参数对氮气膜反应器混合段、反应段以及冷凝段流体温度的影响,确定优化的运行参数。在此基础上,对基于氮气膜反应器与水膜反应器的SCWO系统经济性进行对比。研究表明:在系统启动阶段,氮气膜反应器混合段流体温度随着上支路氮气流量以及温度的升高而升高,其中上支路氮气温度对混合段流体温度影响较大;提高混合段流体温度有助于加快有机废液去除速率;冷凝段流体温度随着下支路氮气流量的增加而降低。基于氮气膜反应器的SCWO系统处理成本为195. 87元/t,低于基于水膜反应器的SCWO系统处理成本(222. 78元/t),具有良好的工业应用前景。
Oxygen and nitrogen were produced by an air separation device,and then nitrogen was used as protection film to replace the water film,which could solve the consumption of oxidants and evaporated water in the supercritical water oxidation system. A supercritical water oxidation( SCWO) system based on a nitrogen film reactor was simulated by Aspen Plus,and the effect of major operating parameters on fluid temperatures of the mixing section,reacting section,and condensation section of the nitrogen film reactor were investigated to determine the optimized operating parameters. The economy of SCWO systems based on nitrogen film reactor and water film reactor was compared. The research showed that in the starting stage,the temperatures of the mixing section increased with the increase of the nitrogen flow and temperature of the upper branch of nitrogen film reactor,especially the temperature of nitrogen in the upper branch. The increase of fluid temperature of the mixing section contributed to accelerating the removal rate of organic wastewater. The fluid temperature of the condensation section decreased with increase of the nitrogen flow of the lower branch. Besides,the cost of the treatment for the SCWO system based on a nitrogen film reactor was 195. 87 Yuan/t,which was lower than that of the SCWO system based on a water film reactor( 222. 78 Yuan/t). The results showed the broad industrial application prospect of the SCWO system based on a nitrogen film reactor.
Oxygen and nitrogen were produced by an air separation device,and then nitrogen was used as protection film to replace the water film,which could solve the consumption of oxidants and evaporated water in the supercritical water oxidation system. A supercritical water oxidation( SCWO) system based on a nitrogen film reactor was simulated by Aspen Plus,and the effect of major operating parameters on fluid temperatures of the mixing section,reacting section,and condensation section of the nitrogen film reactor were investigated to determine the optimized operating parameters. The economy of SCWO systems based on nitrogen film reactor and water film reactor was compared. The research showed that in the starting stage,the temperatures of the mixing section increased with the increase of the nitrogen flow and temperature of the upper branch of nitrogen film reactor,especially the temperature of nitrogen in the upper branch. The increase of fluid temperature of the mixing section contributed to accelerating the removal rate of organic wastewater. The fluid temperature of the condensation section decreased with increase of the nitrogen flow of the lower branch. Besides,the cost of the treatment for the SCWO system based on a nitrogen film reactor was 195. 87 Yuan/t,which was lower than that of the SCWO system based on a water film reactor( 222. 78 Yuan/t). The results showed the broad industrial application prospect of the SCWO system based on a nitrogen film reactor.
引文
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[2] Chen Z,Wang G W,Yin F J,et al. A new system design for supercritical water oxidation[J]. Chemical Engineering Journal,2015,269:343-351.
[3] Marrone P A. Supercritical water oxidation-current status of fullscale commercial activity for waste destruction[J]. Journal of Supercritical Fluids,2013,79(7):283-288.
[4] Zhang F M,Shen B Y,Su C J,et al.Energy consumption and energy analyses of a supercritical water oxidation system with a transpiring wall reactor[J]. Energy Conversion and Management,2017,145:82-92.
[5]张凤鸣,陈守燕,徐纯燕,等.基于蒸发壁反应器的超临界水氧化技术研究进展[J].化工进展,2011,30(8):1643-1650.
[6]马春元,陈桂芳,陈守燕,等.以氮气作保护膜的超临界水氧化流体注采系统及其工艺:CN102678097A[P].2012-09-19.
[7]张勇,张凤鸣,马春元,等.超临界水氧化气膜反应器模拟[J].现代化工,2013,33(11):110-114.
[8]熊杰,赵海波,郑楚光,等.深冷空分系统的过程模拟、优化及利用分析[J].低温工程,2011(3):39-43.
[9] Zhang F M,Ma C Y. CFD simulation of a transpiring-wall SCWO reactor:formation and optimization of the water film[J]. AIChE Journal,2016,62(1):195-206.
[10]张凤鸣.超临界水氧化水膜反应器的热负荷特性研究[D].济南:山东大学,2012.
[11] Turton R,Bailie R C,Whiting W B,et al. Analysis synthesis and design of chemical processes[M].New Jersey:Prentice Hall,2012.
[12] Smith R. Chemical Process Design and Integration[M]. New York:John Wiley,2005.
[13] Douglas J M. Conceptual design of Chemical Processes[M]. New York:Mo Graw. Hill,1988.
[14]成大先.机械设计手册[M].5版.北京:化学工业出版社,2008:108-110.
[15] Mignard D. Correlating the chemical engineering plant cost index with macro-economic indicators[J]. Chemical Engineering Research and Design,2014,92(2):285-294.
[16] Zhang F M,Xu C Y,Zhang Y,et al. Experimental study on the operating characteristics of an inner preheating transpiring wall reactor for supercritical water oxidation:temperature profiles and product properties[J].Energy,2014,66(4):577-587.