Experimental investigation on heat recovery from condensation of thermal power plant exhaust steam by a CO2 vapor compression cycle

SUMMARY In this paper, a method that utilizes CO2 vapor compression thermodynamic cycle to recover low-temperature heat from exhausted water steam of fossil fuel thermal power plants is reported. Experimental investigation was carried out to study the characteristics of low-temperature heat recovery by liquid CO2 evaporation process from vacuum exhausted steam condensation occurring at the turbine exit. Furthermore, measured heat recovery performances over one whole year are presented and discussed. Experimental results show that the present heat recovery process by CO2 vapor compression cycle is able to operate stably. The yearly averaged water temperature at the CO2 condenser outlet was measured at 87.5 °C with a COP value above 5.0. This high energy efficiency ratio is found to be mainly due to two factors: the transcritical CO2 vapor compression and steam condensation phase change occurring on the CO2 evaporator. The findings from this paper provide helpful guidelines for low-temperature heat recovery system design and improving fossil fuel utilization efficiency. Copyright © 2013 John Wiley & Sons, Ltd.

[1]  Jørn Stene,et al.  Residential CO2 heat pump system for combined space heating and hot water heating , 2005 .

[2]  Omer Comakli,et al.  Heat pump use in milk pasteurization: an energy analysis , 2004 .

[3]  Hiroshi Yamaguchi,et al.  A Feasibility Study of CO2-Based Rankine Cycle Powered by Solar Energy , 2005 .

[4]  Ammar Abdulaziz Alsairafi,et al.  Effects of ambient conditions on the thermodynamic performance of hybrid nuclear‐combined cycle power plant , 2013 .

[5]  E. Azad,et al.  Thermal performance of waste-heat recuperator with heat pipes for thermal power station , 1989 .

[6]  Min-Soo Kim,et al.  Performance evaluation of a stack cooling system using CO2 air conditioner in fuel cell vehicles , 2009 .

[7]  S. Supranto,et al.  Heat pump assisted distillation. VI: Classified references for heat pump assisted distillation systems from 1945 to February 1986 , 1987 .

[8]  Jahar Sarkar,et al.  Optimization of a transcritical CO2 heat pump cycle for simultaneous cooling and heating applications , 2004 .

[9]  K. Abrahamsson,et al.  Application of heat pump systems for energy conservation in paper drying , 1997 .

[10]  G. Lorentzen.  Revival of carbon dioxide as a refrigerant , 1994 .

[11]  Wenhua Li,et al.  Operation optimization of an organic rankine cycle (ORC) heat recovery power plant , 2011 .

[12]  Omar M. Al-Rabghi,et al.  Thermophysical relationships for waste heat recovery using looped heat pipes , 1994 .

[13]  Ibrahim Dincer,et al.  Performance analysis of an industrial waste heat‐based trigeneration system , 2009 .

[14]  Hiroshi Yamaguchi,et al.  A novel CO2 refrigeration system achieved by CO2 solid-gas two-phase fluid and its basic study on system performance , 2009 .

[15]  Jahar Sarkar,et al.  Simulation of a transcritical CO2 heat pump cycle for simultaneous cooling and heating applicationsElimination des cristaux de givre sur une plaque froide: effets des fréquences stationnaires et de balayage des champs électriques , 2006 .

[16]  Petter Nekså,et al.  CO2 heat pump systems , 2002 .

[17]  Hiroshi Yamaguchi,et al.  Study of solar energy powered transcritical cycle using supercritical carbon dioxide , 2006 .

[18]  Georges Descombes,et al.  Modelling of waste heat recovery for combined heat and power applications , 2009 .

[19]  V. V. Slesarenko.  Heat pumps as a source of heat energy for desalination of seawater , 2001 .

[20]  Christos N. Markides,et al.  The role of pumped and waste heat technologies in a high-efficiency sustainable energy future for the UK , 2013 .

[21]  J. C. Bruno,et al.  Optimization of energy plants including water/lithium bromide absorption chillers , 2000 .

[22]  Fahad A. Al-Sulaiman,et al.  Trigeneration: A comprehensive review based on prime movers , 2011 .

[23]  Xin-Rong Zhang,et al.  Preliminary investigation of a transcritical CO2 heat pump driven by a solar‐powered CO2 Rankine cycle , 2013 .

[24]  Stephen White,et al.  Modelling the performance of a transcritical CO2 heat pump for high temperature heating , 2002 .

[25]  Xin‐Rong Zhang,et al.  Basic study on new cryogenic refrigeration using CO2 solid–gas two phase flow , 2008 .

[26]  Honghyun Cho,et al.  Performance evaluation of a two-stage CO2 cycle with gas injection in the cooling mode operation , 2009 .

[27]  Dj Cleland,et al.  A Heat Pump for Simultaneous Refrigeration and Water Heating , 1997 .

[28]  Yousef S.H. Najjar,et al.  Recovery and utilization of waste heat , 1993 .

[29]  René Rieberer.  Naturally circulating probes and collectors for ground-coupled heat pumps , 2005 .

[30]  Martin Désilets,et al.  Electricity Generation from Low Temperature Sources , 2009 .

[31]  Jostein Pettersen,et al.  Fundamental process and system design issues in CO2 vapor compression systems , 2004 .

[32]  Armin Hafner,et al.  An automobile HVAC system with CO2 as the refrigerant. Discussion , 1998 .

[33]  Noam Lior,et al.  Thoughts about future power generation systems and the role of exergy analysis in their development , 2002 .

[34]  Xiaojun Shi,et al.  Thermodynamic analysis of an LNG fuelled combined cycle power plant with waste heat recovery and utilization system , 2007 .