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Research Papers: Research Papers

Superheater and Drum Lifetime Estimation: An Approach Based on Dynamic Analysis

[+] Author and Article Information
Alberto Benato

Mem. ASME
Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: alberto.benato@unipd.it

Anna Stoppato

Mem. ASME
Professor
Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: anna.stoppato@unipd.it

Alberto Mirandola

Fellow ASME
Professor
Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: alberto.mirandola@unipd.it

Nicola Destro

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: nicola.destro@dii.unipd.it

Stefano Bracco

Assistant Professor
Department of Naval,
Electrical, Electronic and Telecommunication Engineering,
University of Genova,
Via all'Opera Pia 11a,
Genova 16145, Italy
e-mail: stefano.bracco@unige.it

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 9, 2015; final manuscript received October 10, 2016; published online November 10, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(3), 031001 (Nov 10, 2016) (7 pages) Paper No: JERT-15-1431; doi: 10.1115/1.4035020 History: Received November 09, 2015; Revised October 10, 2016

The increasing penetration of variable and unpredictable renewable energy sources into the liberalized electricity market brings about significant changes in the management strategies of fossil fuel power plants. These new operation modes cause remarkable effects on the lifetime of the plants. Consequently, the operators of the plants need to be assisted by effective procedures, which are able to define suitable production plans. In the present paper, the authors propose a dynamic model which can be used to estimate the effects of the variations of thermodynamic and mechanical parameters during transient operation, start-ups and shut-downs. To check the effectiveness of the model, a combined cycle plant with a three-pressure level heat recovery steam generator has been selected. The geometry of the components, the influence of the environmental conditions, and the control strategies are included in the model. In this way, the residual lifetime of the most critical components can be predicted.

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References

Figures

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Fig. 1

Simplified sketch of the HRSG developed model

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Fig. 2

Exhaust gasses mass flow rate and temperature at the HRSG inlet section for the three transients

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Fig. 3

Electric power produced by the HRSG bottoming unit

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Fig. 4

Temperature of the wall and pressure of the steam at the high-pressure superheater tube bank outlet section

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Fig. 5

Temperature of the wall and pressure of the steam in the high-pressure steam drum

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Fig. 6

The drum Tresca equivalent stress computed for the three transients

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