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Improved Organic Rankine Cycle System Coupled with Mechanical Vapor Recompression Distillation for Separation of Benzene-Toluene Mixture

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Abstract

Herein, we propose three improved Organic Rankine Cycle (ORC) Systems to separate the benzene-toluene mixture by the combination of ORC with Mechanical Vapor Recompression (MVR) heat pump distillation process. A chemical process software, Aspen plus, was used to simulate all the processes. The improved ORC system was employed to recover waste heat from the MVR heat pump system. The ORC waste-heat power generation process was obtained based upon the net power output and cycle’s thermal efficiency. Finally, energy saving was considered as primary criteria for the ORC system selection. The results showed that the ORC system by exhaust stream regenerative cycle (EGC) coupled with MVR heat pump distillation process saves 21.29% electrical energy. The ORC system by EGC coupled with MVR heat pump distillation process has more energy-saving advantages.

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Abbreviations

MVR :

Mechanical Vapor Recompression

ORC :

Organic Rankine Cycle

EVE :

evaporator

TURB :

turbine

CON :

condenser

TAC :

total annual cost

P1, P2 :

pump1, pump2

EGC :

exhaust stream regenerative cycle process

ERC :

extraction steam reheat cycle

RCP :

reheating cycle process

m wf (kg/s):

the working fluid flow;

η GEN (%):

the efficiency of generator;

h 1 (kJ/kg) and h 2 (kJ/kg):

the enthalpy of working fluid at the inlet and outlet of pump;

υ (m3/kg):

the specific volume of working fluid at the inlet of pump;

P 5 (Pa) and P 6 (Pa):

the pressures at the inlet and outlet of pump;

h 5 (kJ/kg) and h 6 (kJ/kg):

the enthalpies of working fluid at the inlet and outlet of turbine

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Funding

This research was funded by Changzhou University, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, 213164.

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, 213164, People’s Republic of China

    Xiaoxin Gao, Song Yang & Deming Yang

  2. College of Petrochemical Engineering, Changzhou University, Changzhou, 213164, People’s Republic of China

    Xiaoxin Gao, Xueming Yin, Song Yang & Deming Yang

Authors
  1. Xiaoxin Gao
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  2. Xueming Yin
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  3. Song Yang
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  4. Deming Yang
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Corresponding author

Correspondence to Xiaoxin Gao.

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Gao, X., Yin, X., Yang, S. et al. Improved Organic Rankine Cycle System Coupled with Mechanical Vapor Recompression Distillation for Separation of Benzene-Toluene Mixture. Process Integr Optim Sustain 3, 189–198 (2019). https://doi.org/10.1007/s41660-018-0076-8

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  • DOI: https://doi.org/10.1007/s41660-018-0076-8

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