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Recuperator Energy and Exergy Analysis in the Application of Microturbine in Cogeneration of Heat and Power Systems

M. A. Pourmohamad Department of Mechanical Engineering, Islamic Azad University, Jolfa International

Branch, Aras free trade & Industrial zone, Jolfa, Iran M. A. Ashjari Department of Mechanical Engineering, Islamic Azad University, Jolfa International

Branch, Aras free trade & Industrial zone, Jolfa, Iran

A. R. Rostamzadeh Khosroshahi Department of Mechanical Engineering, Islamic Azad University, Tabriz Branch, Tabriz, Iran

Abstract

Micro turbines are indeed very small gas turbines (25-300 kW) that usually have thermal regenerator or recuperator to minimize the energy consumption. In currently working plants, the air entered into the compressor is compressed and then is preheated using the heat of turbine exhaust gases in a recuperator. One of the methods to enhance the performance of the gas turbine is using a heat exchanger to recover the energy of hot gases leaving from gas turbine. To recover heat in gas turbine industry different devices have been used. In general, heat recovery devices are divided into two groups i.e. i) regenerators and ii) recuperators. Regenerators act periodically and at the first time interval it absorbs the heat of turbine exhaust gas in the heat exchanger matrix and in the next time interval transfers heat to the cold dense air leaving the compressor. In contrast, Recuperators are heat exchangers that transfer heat into compressed air continuously and use the energy of exhaust hot gases. This paper investigates the thermodynamic of micro-turbine. The results show that adding a recuperator increases the cycle thermal efficiency significantly. Also this paper investigates the effect of recuperator materials on the micro-turbine performance and the turbine inlet temperature as the most effective factor to increase the performance. The thermodynamic equations were solved by an engineering software EES2013. Considering the results show that at the pressure ratio of 4.29 the thermal efficiency is maximum and adding a recuperator decreases the fuel consumption rate 45 percent in the combustion chamber. Key words: Thermodynamic modeling, Micro-turbine, Recuperator, EES software.

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15- d�()� [1] Catalog of CHP Technologies, U.S. Environmental Protection

Agency, Combined Heat and Power Partnership, March 2015. [2] Adrian Bejan, George Tsatsaronis, Michael Moran, Thermal

Design and Optimization, 1st edition, Wiley Interscience, NY 1996.

[3] McDonald C.F. and Wilson D.G., The utilization of recuperated and regenerated engine cycles for high-efficiency gas turbines in the 21st century, Appl. Thermal Eng., Vol. 16, pp. 635-653, 1996,

[4] Kesseli J., Wolf T., Nash J., Freedman S., Micro industrial and advanced gas turbines employing recuperators, ASME Paper No. GT2003-38938, ASME, New York, NY, 2003.

[5] H.I.H. Saravanamuttoo, G.F.C. Rogers, H. Cohen, Paul Straznicky, Gas Turbin theory, 6th edition, Longman Group ltd ed. Landon, 1996.

[6] Hamilton S., Microturbine generator handbook, pennWell corporation, 2003.

]7[ �>�� * %����� ,�*������� %�3 (�6 �$ %(�6 %�3 �1�!�F ����(�6 �$ E3�Q� 1�!�F �,�*������� %(�6 %�3 � �$ E3�Q� ����

(�6 �1383. [8] http://www.capstonturbine.com.

]9[ �%�CC.+� �CC���� � �CC/&� ��CC3O CC��� ����( ,CC�+��� P�CC� %(�CC���� 1�C�2.3 �C���� �� ,�*��C����� �C�-.T SC�-H� � ����������� � =��C+

�=��]%>�� ?@� %(�! ���"* W��/�� �1389. [10] Claire Soares, Microturbines Applications for Distributed

Energy Systems, Department of Automatic Control Lund Institute of Technology, May 2002.

[11] P.A. Pilavachi, Mini and micro-gas turbines for combined heat and power, Applied Thermal Engineering, 2002, 22 (18).

[12] A. Traverso., A. F. Mussardo, Optimal of component recuperators for microturbine application, Thermal Engineering, V25, PP. 2054-2071, 2005.

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