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Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Operational Strategies of Wet-Cycle Micro Gas Turbines and Their Economic Evaluation

[+] Author and Article Information
Panagiotis Stathopoulos

Chair of Fluid Dynamics
Hermann-Föttinger-Institute,
Technische Universität Berlin,
Müller-Breslau-Str. 8,
Berlin 10623, Germany
e-mail: stathopoulos@tu-berlin.de

Christian Oliver Paschereit

Chair of Fluid Dynamics
Professor
Hermann-Föttinger-Institute,
Technische Universität Berlin,
Müller-Breslau-Str. 8,
Berlin 10623, Germany

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 14, 2015; final manuscript received June 21, 2016; published online July 27, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(12), 122301 (Jul 27, 2016) (9 pages) Paper No: GTP-15-1289; doi: 10.1115/1.4033999 History: Received July 14, 2015; Revised June 21, 2016

The simultaneous expansion of variable renewables and combined heat and power (CHP) plants in Europe has given rise to a discussion about their compatibility. Due to the concurrence of high wind power generation and high heating loads, it has been argued that only the flexible, electricity-oriented operation of CHP plants could go along with the extended penetration of renewables in the European energy system. The current work focuses on the wet-cycle simulation of a Turbec T-100. Three operational strategies are applied on the heat and electricity demand data of a public building, to assess the economic and environmental performance of the wet cycle. The operation of the micro gas turbine (mGT) is modeled in aspen plus, and the model is validated with data found in the literature. The economic aspects of the operational strategies are assessed with a financial model, which takes into account the current CHP policy incentives and price levels. Furthermore, the advantages and drawbacks of wet operation are highlighted by its comparison to the typical heat-driven operation of dry-cycle mGTs, with a reference to the same case study. It is shown that the wet-cycle turbines have a higher number of full load equivalent operating hours and can achieve higher investment payback, with minor drawbacks to their overall environmental performance.

Copyright © 2016 by ASME
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Figures

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Fig. 1

Percentage of the annual wind and thermal power generation in each month in Germany 2003–2010 [26]

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Fig. 2

Typical layout of a recuperated CHP mGT

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Fig. 3

Typical layout of an STIG mGT

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Fig. 4

Description of the iteration loops. Adapted from Ref. [11].

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Fig. 5

Performance map of the dry mGT. The variables are given as a percentage of their value at full load.

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Fig. 6

Performance map of the wet mGT at full electric load

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Fig. 7

Maximum steam injection rates and minimum thermal load of a wet mGT as a function of its electric load

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Fig. 8

Schematic diagram of the gas engine model

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Fig. 9

Electric efficiency of gas engines as a function of their electric load and power class

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Fig. 10

Thermal energy production of gas engines as a function of their electric load

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Fig. 11

Total specific installation costs as a function of the plant size

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Fig. 12

Gas engines variable operational costs as a function of their size

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Fig. 13

Power load duration curve of the DEFRA-Nobel House in 2013

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Fig. 14

Heat load duration curve of the DEFRA-Nobel House in 2013

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Fig. 15

Heat production of the optimum plants for the heat-oriented CHP operation

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Fig. 16

Electricity production of the optimum plants for the heat-oriented CHP operation

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Fig. 17

Heat production of the optimum plants for the power-oriented CHP operation

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Fig. 18

Power production of the optimum plants for the power-oriented CHP operation

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Fig. 19

Heat production of the optimum plants for the power-oriented CHP operation with waste heat

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Fig. 20

Power production of the optimum plants for the power-oriented CHP operation with waste heat

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