Assessment and modelling of the waste heat availability from gas turbine based CHP systems for ORC systems

This paper presents the findings of modelling of waste heat availability from a Combined Heat and Power (CHP) system with a rated electrical output of 4.35 MW and steam production of 8,165 kg/hr at 16 barg. The model has been developed using HYSYS Dynamics TM . The amount of waste heat available from the CHP system is dependent on the ambient air, steam production, and gas turbine power output. A Pitot traverse measurement across the duct was undertaken to determine the actual amount of waste heat available from the CHP system. The measurements were conducted in accordance to BS EN 15259:2007 standards. The simulation results of waste heat availability have been compared to experimental data at various CHP power outputs. The HYSYS Dynamics TM model waste heat calculation was shown to be 5.3% lower than experimental waste heat measurements. An analysis of the waste heat availability by both modelling and experiment was done which shows that the CHP system waste heat available between 3.82 MW and 5.09 MW. Recovering this low grade heat from the CHP system using Clean Cycle TM 125 ORC systems generates between 217 kW and 344 kW of electricity, respectively. Increases of 2.3% in electrical efficiency of the CHP system are predicted.

[1]  W. Worek,et al.  Optimum design criteria for an Organic Rankine cycle using low-temperature geothermal heat sources , 2007 .

[2]  Isam H. Aljundi,et al.  Effect of dry hydrocarbons and critical point temperature on the efficiencies of organic Rankine cycle , 2011 .

[3]  Fredrik Haglind,et al.  Variable geometry gas turbines for improving the part-load performance of marine combined cycles – Combined cycle performance , 2011 .

[4]  Q. M. Jaber,et al.  Assessment of Power Augmentation from Gas Turbine Power Plants Using Different Inlet Air Cooling Systems , 2007 .

[5]  Rahman Saidur,et al.  Energy, exergy and economic analysis of industrial boilers , 2010 .

[6]  Andreas Poullikkas,et al.  Implementation of distributed generation technologies in isolated power systems , 2007 .

[7]  Alessandro Franco,et al.  On some perspectives for increasing the efficiency of combined cycle power plants , 2002 .

[8]  Andreas Poullikkas,et al.  An overview of current and future sustainable gas turbine technologies , 2005 .

[9]  T. Hung.  Waste heat recovery of organic Rankine cycle using dry fluids , 2001 .

[10]  Chi-Chuan Wang,et al.  Effect of working fluids on organic Rankine cycle for waste heat recovery , 2004 .

[11]  Yousef S.H. Najjar,et al.  Efficient use of energy by utilizing gas turbine combined systems , 2001 .

[12]  T. Heppenstall,et al.  Advanced gas turbine cycles for power generation: a critical review , 1998 .

[13]  Santanu Bandyopadhyay,et al.  Process integration of organic Rankine cycle , 2009 .

[14]  Yousef S.H. Najjar,et al.  Augmentation of gas turbine performance using air coolers , 2004 .

[15]  Pedro J. Mago,et al.  An examination of regenerative organic Rankine cycles using dry fluids , 2008 .

[16]  S. K. Wang,et al.  A Review of Organic Rankine Cycles (ORCs) for the Recovery of Low-grade Waste Heat , 1997 .

[17]  Zhen Lu,et al.  Performance analysis and optimization of organic Rankine cycle (ORC) for waste heat recovery , 2007 .

[18]  Yiping Dai,et al.  Exergy analyses and parametric optimizations for different cogeneration power plants in cement industry , 2009 .

[19]  Jiangfeng Wang,et al.  Parametric optimization and comparative study of organic Rankine cycle (ORC) for low grade waste heat recovery , 2009 .

[20]  A. Borsukiewicz-Gozdur,et al.  Comparative analysis of natural and synthetic refrigerants in application to low temperature Clausius–Rankine cycle , 2007 .

[21]  Christopher J. Koroneos,et al.  Optimum gas turbine cycle for combined cycle power plant , 2008 .

[22]  S. D. Probert,et al.  Rankine-cycle systems for harnessing power from low-grade energy sources , 1990 .

[23]  E. Stefanakos,et al.  A REVIEW OF THERMODYNAMIC CYCLES AND WORKING FLUIDS FOR THE CONVERSION OF LOW-GRADE HEAT , 2010 .

[24]  Yousef S.H. Najjar,et al.  Gas turbine cogeneration systems : a review of some novel cycles , 2000 .

[25]  Jie Ji,et al.  Construction and dynamic test of a small-scale organic rankine cycle , 2011 .

[26]  Yousef S.H. Najjar,et al.  Enhancement of performance of gas turbine engines by inlet air cooling and cogeneration system , 1996 .

[27]  Vincent Lemort,et al.  Thermo-economic optimization of waste heat recovery Organic Rankine Cycles , 2011 .

[28]  Andrés Amell,et al.  Influence of the relative humidity on the air cooling thermal load in gas turbine power plant , 2002 .

[29]  Rodney Evans.  Environmental and economic implications of small-scale CHP , 1993 .