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Title
Dependence between nominal power deterioration and thermal efficiency of gas turbines due to fouling

ISSN printed: 1733-8670, ISSN on-line: 2392-0378
Herdzik, Jerzy1
URI: https://repository.am.szczecin.pl/handle/123456789/2704
2022-03-31
Deterioration in the performance of gas turbines is a well-known phenomenon occurring during their operation. The most important form is a decrease in the internal efficiency of the compressor and turbine due to fouling, which is the most significant deterioration problem for an operator. This article presents the effect of gas turbine fouling as a drop in airflow, pressure ratio, and compressor efficiency resulting in a reduction in power output and thermal efficiency. This resulted in a decrease in the nominal power of a gas turbine and an increase in the fuel consumption (heat rate). The fouling effects were described using the example of the MT30 marine gas turbine with a nominal power of 36 MW. The estimated profit loss during the operation of the gas turbine was within the range of 1–10% of the total fuel consumption cost. A 2% deterioration in the output of a gas turbine accounted for US$ 10,000–20,000 per year and 1 MW of gas turbine nominal power (according to marine fuel prices in 2019–2020) – this means at least US$ 300,000 annually for an MT30. Due to the low accuracy of fuel consumption measurements, another possibility was provided. The correlation between the gas turbine power deterioration and thermal efficiency was presented, which made it possible to estimate the increase in the specific and total fuel consumption when the nominal power deterioration is known. Two linear approximations were proposed to calculate increases in the annual operating costs for an MT30 due to fouling.
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Title

Dependence between nominal power deterioration and thermal efficiency of gas turbines due to fouling

Pages

Figures

9

Tables

1

ISSN printed

1733-8670

ISSN on-line

2392-0378

DOI

10.17402/498

Type

Original scientific article

Journal

69 Scientific Journals of the Maritime University of Szczecin, no. 69 / 2022

Publisher

Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie

Copyright Holder

Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie

Published

2022-03-31

Recieved

2021-08-20

Accepted

2022-01-10

Funding

No data

Keywords

gas turbine, gas turbine deterioration, reasons of fouling, thermal efficiency, performance, fuel consumption

URI:

https://repository.am.szczecin.pl/handle/123456789/2704

Language

English

Authors

Herdzik, Jerzy1

Affiliation

1 Gdynia Maritime University, Poland, georgher@am.gdynia.pl

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