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Publication Title | PowerEnergy2015-49439 EVALUATION FOR SCALABILITY OF A COMBINED CYCLE USING GAS AND BOTTOMING SCO2 TURBINES

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Proceedings of ASME Power & Energy 2015 June 28-July 2, 2015, San Diego Convention Center

PowerEnergy2015-49439

EVALUATION FOR SCALABILITY OF A COMBINED CYCLE USING GAS AND BOTTOMING SCO2 TURBINES

Dr. Leonid Moroz

SoftInWay Inc.

15 New England Executive Park Burlington, MA 01803, USA L.Moroz@SoftInWay.com

Petr Pagur

SoftInWay Inc.

15 New England Executive Park Burlington, MA 01803, USA Petr.Pagur@SoftInWay.com

Dr. Oleksii Rudenko

SoftInWay Inc.

15 New England Executive Park Burlington, MA 01803, USA O.Rudenko@SoftInWay.com

ABSTRACT

Bottoming cycles are drawing a real interest in a world where resources are becoming scarcer and the environmental footprint of power plants is becoming more controlled. Reduction of flue gas temperature, power generation boost without burning more fuel and even production of heat for cogeneration applications are very attractive and it becomes necessary to quantify how much can really be extracted from a simple cycle to be converted to a combined configuration.

As supercritical CO2 is becoming an emerging working fluid [2, 3, 5, 7 and 8] due not only to the fact that turbomachines are being designed significantly more compact, but also because of the fluid’s high thermal efficiency in cycles, it raises an increased interest in its various applications. Evaluating the option of combined gas and supercritical CO2 cycles for different gas turbine sizes, gas turbine exhaust gas temperatures and configurations of bottoming cycle type becomes an essential step toward creating guidelines for the question, “how much more can I get with what I have?”.

Using conceptual design tools for the cycle system generates fast and reliable results to draw this type of conclusion. This paper presents both the qualitative and quantitative advantages of combined cycles for scalability using machines ranging from small to several hundred MW gas turbines to determine which configurations of S-CO2 bottoming cycles are best for pure electricity production.

INTRODUCTION

Gas turbines make a great contribution to global electricity generation. Analysis of the energy market shows that in the future the portion of electricity generated by gas turbines will only increase. The efficiency level of modern GTU (Gas Turbine Units) operating in a Brayton cycle is above 40%. The best way to increase GTU efficiency and decrease the environmental footprint is to recover waste heat by adding a bottoming cycle. Traditionally, as the bottoming cycle, a steam turbine cycle on the basis of a Rankine cycle is used. The efficiency level of advanced combined cycles (GTU coupled with steam cycle) can exceed 60% [1]. But due to the features of steam cycles (huge HRSG and condenser, lots of auxiliary equipment, difficulties in scaling down steam systems, and so on) usually only high power units with a power level above 120 MW are configured for combined cycle service. Gas turbines of small and medium size are typically sold and operated as simple cycle units [2].

Thus the search for alternatives to the bottoming steam cycle for existing and brand new gas turbines of different sizes, and exhaust gases temperatures is a very real task. One of the very promising way for this purpose is the consideration of Supercritical CO2 (S-CO2) cycles based on closed-loop Brayton cycle and its modifications:

Dr. Maksym Burlaka

SoftInWay Inc.

15 New England Executive Park Burlington, MA 01803, USA M.Burlaka@SoftInWay.com

Clement Joly

SoftInWay Inc.

15 New England Executive Park Burlington, MA 01803, USA Clement.Joly@SoftInWay.com



Carbon dioxide is an ideal working fluid for closed-loop cycles. It is a low-cost, non-toxic, non-flammable, non- corrosive, readily available, stable fluid and there are a lot of available test data in a wide range of parameters.

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Copyright © 2015 by ASME

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