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European Association for the Development of Renewable Energies, Environment and Power Quality (EA4EPQ) International Conference on Renewable Energies and Power Quality (ICREPQ’12) Santiago de Compostela (Spain), 28th to 30th March, 2012 Assessment and modelling of the waste heat availability from gas turbine based CHP systems for ORC systems E. Firdaus1, K.Saaed1, D.Bryant2, M.Jones1, S.Biggs3 and B.Bahawodin1 1 Computing Engineering and Mathematics University of Brighton BN2 4GJ (United Kingdom) Phone/Fax number: +0044 203 0060166/65, e-mail: E.Firdaus@brighton.ac.uk, K.Saaed@brighton.ac.uk, M.P.Jones@brighton.ac.uk, B.Baha@brighton.ac.uk 2 Heatcatcher Ltd. The Roller Mill Mill Lane Uckfield TN22 5AA (United Kingdom) Phone/Fax number: +0044 203 0060166/65, e-mail: Darren.Bryantt@heatcatcher.com 3 Efficient Air Ltd. The Roller Mill Mill Lane Uckfield TN22 5AA (United Kingdom) Phone/Fax number: +0044 182 5748150/51, e-mail: Steven.Biggs@efficientair.co.uk Abstract. 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 DynamicsTM. 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 DynamicsTM 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 3.82MW and 5.09 MW. Recovering this low grade heat from the CHP system using Clean CycleTM 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. Key words waste heat recovery; gas turbine; modelling; Hysys; CHP; ORC 1. Introduction Interest in capturing low-grade (low temperature) heat has grown dramatically in past decades [1]. Important alternatives have been proposed to generate electricity from low temperature heat sources such as solar thermal power, industrial waste heat, engine exhaust gases and domestic boilers [1]-[2]. The potential for utilising waste heat from industrial applications is particularly promising [3] because of the large amount of waste heat. Statistical investigations indicate that low-grade waste heat account for 50% or more of the total heat generated in industry [4]. Using conventional methods such as steam rankine cycle to recover energy from low-grade heat is economically infeasible [5]-[6]. However, the Organic Rankine Cycle (ORC) system [1],[6],[4],[7] uses a high molecular working fluid which boils at a lower temperature than water and is thus more efficient than water with low grade waste heat. Working fluids used in the ORC system have been studied, such as R-113 [8]-[11], R-245fa [5],[12],[13], R-245ca [9]-[11], Toluene [7],[11] and Ammonia [10],[14]. A typical ORC system basically comprises a pump, a turbine, an evaporator and a condenser. The working fluid is vaporised by a heat source in the evaporator. The superheated vapour of the working fluid expands in the turbine to generate electricity and is then condensed. The condensed working fluid is finally sent via a pump intoPDF Image | Assessment and modelling of the waste heat availability from gas turbine based CHP systems for ORC systems
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