基于有机朗肯循环的混合二甲苯MVR热泵精馏工艺

doi:10.11949/j.issn.0438-1157.20170781

摘要/Abstract

摘要：

常规机械蒸气再压缩（MVR）热泵精馏分离混合二甲苯工艺，存在压缩机电耗较大及塔顶压缩蒸气的显热未被利用等问题。有机朗肯循环（ORC）发电技术则可以将低温余热转化为电能以供压缩机使用，由此提出了ORC发电技术耦合MVR热泵和带乏汽回热循环（EGC）的ORC发电技术耦合MVR热泵两种精馏工艺应用于本体系的分离研究。以年总费用（TAC）和能耗为分离工艺的评价指标，系统净输出功和循环热效率作为ORC系统的评价指标，对以上两种耦合精馏工艺进行模拟与优化，并与常规MVR热泵精馏工艺进行比较与分析。研究结果表明，ORC发电技术耦合MVR热泵精馏工艺和带EGC的ORC发电技术耦合MVR热泵精馏工艺较常规MVR热泵精馏工艺均具有一定的节能和经济优势，可分别减少能耗9.64%和9.89%，节省TAC 3.19%和3.50%。

关键词: 混合二甲苯, MVR热泵, 有机朗肯循环, 精馏, 计算机模拟, 能耗, 年总费用

Abstract:

Conventional mechanical steam compression(MVR) heat pump distillation for separating mixed xylene exists shortcomings of high compressor power consumption and overhead sensible heat unused. Organic Rankine cycle(ORC) power generation technology can transform the low-temperature waste heat into electricity for compressor, in view of the above, the MVR heat pump distillation processes coupled by the ORC power generation technology and combined with exhaust steam regenerative cycle(EGC) were applied to separate the system. Taking total annual cost(TAC) and energy consumption as the evaluation indexes of separation process, net output power and cycle thermal efficiency are used as evaluation indexes of ORC system. Simulations for the above two kinds of distillation process were performed and the results were compared with the conventional MVR heat pump distillation process. The results show that compared with the conventional MVR heat pump distillation process,the MVR heat pump distillation processes coupled by ORC power generation technology and combined with EGC power generation technology both have certain energy saving and economic advantages, can reduce energy consumption by 9.64% and 9.89%, and save TAC by 3.19% and 3.50% respectively.

Key words: mixed xylene system, MVR heat pump, organic Rankine cycle, distillation, computer simulation, energy consumption, total annul cost

中图分类号:

TQ028

杨德明, 顾强, 朱碧云, 王争光, 印一凡, 高晓新. 基于有机朗肯循环的混合二甲苯MVR热泵精馏工艺[J]. 化工学报, 2017, 68(12): 4641-4648.

YANG Deming, GU Qiang, ZHU Biyun, WANG Zhengguang, YIN Yifan, GAO Xiaoxin. MVR heat pump distillation process of mixed xylene based on organic Rankine cycle[J]. CIESC Journal, 2017, 68(12): 4641-4648.

参考文献 32

[1]	杨德明, 顾强, 朱碧云, 等. 基于MVR热泵和热集成的混合二甲苯节能精馏工艺[J]. 现代化工, 2017, 37(2):165-168. YANG D M, GU Q, ZHU B Y, et al. Energy saving distillation process for mixed xylene system based on MVR heat pump and heat integration[J]. Modern Chemical Industry, 2017, 37(2):165-168.
[2]	GAO X X, MA Z F, MA J Q, et al. Application of three-vapor recompression heat-pump concepts to a dimethylformamide-water distillation column for energy savings[J]. Energy Technology, 2014, 2(3):250-256.
[3]	杨俊玲, 杨鲁伟, 张振涛. MVR热泵节能技术的研究进展[J]. 风机技术, 2016, 4(10):84-88. YANG J L, YANG L W, ZHANG Z T. Review on energy-saving technology with MVR[J]. Compressor Blower & Fan Technology, 2016, 4(10):84-88.
[4]	ZHAO M, WEI M S, SONG P P, et al. Performance evaluation of a diesel engine integrated with ORC system[J]. Applied Thermal Engineering, 2017, 115:221-228.
[5]	SUN W Q, YUE X Y, WANG Y H. Exergy efficiency analysis of ORC (Organic Rankine Cycle) and ORC based combined cycles driven by low-temperature waste heat[J]. Energy Conversion and Management, 2017, 135:63-73.
[6]	CHEWA J M, REDDYB C C S, RANGAIAHA G P. Improving energy efficiency of dividing-wall columns using heatpumps, Organic Rankine Cycle and Kalina Cycle[J]. Chemical Engineering and Processing:Process Intensification, 2014, 76:45-59.
[7]	WANG Y F, TANG Q K, WANG M Y, et al. Thermodynamic performance comparison between ORC and Kalina cycles for multi-stream waste heat recovery[J]. Energy Conversion and Management, 2017, 143:482-492.
[8]	JIANG L, LU H T, WANG L W, et al. Investigation on a small-scale pumpless Organic Rankine Cycle (ORC) system driven by the low temperature heat source[J]. Applied Energy, 2017, 195:478-486.
[9]	SONG J, GU C W, LI X S. Performance estimation of Tesla turbine applied in small scale Organic Rankine Cycle (ORC) system[J]. Applied Thermal Engineering, 2017, 110:318-326.
[10]	USMAN M, IMRAN M, YANG Y M, et al. Thermo-economic comparison of air-cooled and cooling tower based Organic Rankine Cycle (ORC) with R245fa and R1233zde as candidate working fluids for different geographical climate conditions[J]. Energy, 2017, 123:353-366.
[11]	CHEN T, ZHUGE W L, ZHANG Y J, et al. A novel cascade organic Rankine cycle (ORC) system for waste heat recovery of truck diesel engines[J]. Energy Conversion and Management, 2017, 138:210-223.
[12]	CAO Y, GAO Y K, ZHENG Y. Optimum design and thermodynamic analysis of a gas turbine and ORC combined cycle with recuperators[J]. Energy Conversion and Management, 2016, 116:32-41.
[13]	BRAIMAKIS K, KARELLAS S. Integrated thermoeconomic optimization of standard and regenerative ORC for different heat source types and capacities[J]. Energy, 2017, 121:570-598.
[14]	CARLSON E. Don't gamble with physical properties for simulation[J]. Chem. Eng. Progress, 1996, 10:35-46.
[15]	INVERNIZZI C M, IORA P, PREIBINGER M, et al. HFOs as substitute for R-134a as working fluids in ORC power plants:a thermodynamic assessment and thermal stability analysis[J]. Applied Thermal Engineering, 2016, 103:790-797.
[16]	陈梦琪, 于娜, 刘育良, 等. 反应精馏隔壁塔生产乙酸正丁酯的优化与控制[J]. 化工学报, 2016, 67(12):5066-5081. CHEN M Q, YU N, LIU Y L, et al. Optimization and control of reactive dividing wall column for production of n-butylacetate[J]. CIESC Journal, 2016, 67(12):5066-5081.
[17]	杨剑, 沈本强, 蔺锡钰, 等. 分壁精馏塔分离芳烃的稳态及动态研究[J]. 化工学报, 2014, 65(10):3993-4003. YANG J, SHEN B Q, LIN X Y, et al. Steady state and dynamic control of divided-wall column for separating aromatics[J]. CIESC Journal, 2014, 65(10):3993-4003.
[18]	QUOILIN S, BROEK MVD, DECLAYE S, et al. Techno-economic survey of Organic Rankine Cycle (ORC) systems[J]. Renewable and Sustainable Energy Reviews, 2013, 22(22):168-186.
[19]	杨德明, 叶梦飞, 杜鹏, 等. 基于MVR热泵精馏的乙醇-异丙醇分离工艺[J]. 化工进展, 2014, 33(5):1344-1347. YANG D M, YE M F, DU P, et al. Research on technologies for separating ethanol and isopropanol based on the MVR heat-pump distillation[J]. Chemical Industry and Engineering Progress, 2014, 33(5):1344-1347.
[20]	倪渊, 赵良举, 刘朝, 等. 非共沸混合工质ORC低温烟气余热利用分析与优化[J]. 化工学报, 2013, 64(11):3985-3992. NI Y, ZHAO L J, LIU C, et al. Recovery of waste heat of low-temperature flue gas by parametric optimization on organic Rankine cycle with non-azeotropic mixtures[J]. CIESC Journal, 2013,64(11):3985-3992.
[21]	裴刚, 王东玥, 李晶, 等. 有机朗肯循环热电联供系统的实验研究[J]. 化工学报, 2013, 64(6):1993-2000. PEI G, WANG D Y, LI J, et al. Organic Rankine cycle combined heat and power system[J]. CIESC Journal, 2013, 64(6):1993-2000.
[22]	刘杰, 陈江平, 祁照岗. 低温有机朗肯循环的热力学分析[J]. 化工学报, 2010, 61(S2):9-14. LIU J, CHEN J P, QI Z G. Thermodynamic analysis of low temperature organic Rankine cycle[J]. CIESC Journal, 2010, 61(S2):9-14.
[23]	王慧, 马新灵, 孟祥睿, 等. 工质流量对ORC低温余热发电系统性能的影响[J]. 化工学报, 2015, 66(10):4185-4192. WANG H, MA X L, MENG X R, et al. Effect of mass flow rate on performance of organic Rankine cycle for power generation system with low-temperature waste heat[J]. CIESC Journal, 2015, 66(10):4185-4192.
[24]	张新铭, 余柄宪, 王春. 考虑环境影响的ORC系统综合评价指标及性能分析[J]. 化工学报, 2014, 65(12):4978-4984. ZHANG X M, YU B X, WANG C. Comprehensive evaluation index and performance analysis of organic Rankine cycle system considering environment impact[J]. CIESC Journal, 2014, 65(12):4978-4984.
[25]	顾承真, 闵兆升, 洪厚胜. 机械蒸汽再压缩蒸发系统的性能分析[J]. 化工进展, 2014, 33(1):30-35. GU C Z, MIN Z S, HONG H S. Performance analysis of mechanical vapor recompression evaporation system[J]. Chemical Industry and Engineering Progress, 2014, 33(1):30-35.
[26]	AHMED A A A. Heat pump seawater distillation system using passive vacuum generation system[J]. Desalination, 2016, 397:151-156.
[27]	SHU G Q, ZHAO M R, TIAN H, et al. Experimental investigation on thermal OS/ORC (Oil Storage/Organic Rankine Cycle) system for waste heat recovery from diesel engine[J]. Energy, 2016, 107:693-706.
[28]	BAO H S, MA Z W, ROSKILLY A P. Chemisorption power generation driven by low grade heat-theoretical analysis and comparison with pumpless ORC[J]. Applied Energy, 2017, 186:282-290.
[29]	GHIM G, LEE J. Condensation heat transfer of low GWP ORC working fluids in a horizontal smooth tube[J]. International Journal of Heat and Mass Transfer, 2017, 104:718-728.
[30]	SATANPHOL K, PRIDASAWAS W, SUPHANIT B. A study on optimal composition of zeotropic working fluid in an Organic Rankine Cycle (ORC) for low grade heat recovery[J]. Energy, 2017, 123:326-339.
[31]	NASIR M T, KIM K C. Working fluids selection and parametric optimization of an Organic Rankine Cycle coupled Vapor Compression Cycle (ORC-VCC) for air conditioning using low grade heat[J]. Energy and Buildings, 2016, 129:378-395.
[32]	NEMATI A, NAMI H, RANJBAR F. A comparative thermodynamic analysis of ORC and Kalina cycles for waste heat recovery:a case study for CGAM cogeneration system[J]. Case Studies in Thermal Engineering, 2017, 9:1-13.