Dynamic performance and stress analysis of the steam generator of parabolic trough solar power plants

González-Gómez, P.A.; Gómez-Hernández, Jesús; Ferruzza, Davide; Haglind, Fredrik; Santana, D.

doi:10.1016/j.applthermaleng.2018.10.126

Cited by 18 publications

(15 citation statements)

References 33 publications

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“…González‐Gómez et al modeled the power block transient performance as a series of steady‐state simulations of different loads; however, the heat exchangers in the steam generator system were modeled by coupled transient thermodynamic and stress models to compute the stress. [ 31 ] The analytical stress models were discussed for the critical points of the heat exchanger, and a finite element simulation was compared with the analytical model. Cenuşă et al presented a model to calculate exergy destruction during the heat transfer period in a steam generator.…”

Section: Steady‐state Characteristics Analyses Of Cspmentioning

confidence: 99%

“…González‐Gómez conducted the start‐up simulations and some results are shown in Figure 8 , including the oil‐to‐steam generation temperature, mass flowrate, turbine power output, and evaporator performance. [ 31 ] To avoid thermal shock in the pipeline, oil is sent to the evaporator at 260 °C, which is 20 °C above the saturation temperature of water in the drum. The start‐up of the steam generator takes 45 min and requires ≈36.4 MWh.…”

Section: Dynamic Characteristics Analyses and Control Strategiesmentioning

confidence: 99%

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Review on Performance Analysis of the Power Block in Concentrated Solar Power Plants

et al. 2020

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Section: Steady‐state Characteristics Analyses Of Cspmentioning

confidence: 99%

Section: Dynamic Characteristics Analyses and Control Strategiesmentioning

confidence: 99%

Review on Performance Analysis of the Power Block in Concentrated Solar Power Plants

et al. 2020

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“…In an NGCC plant, the thick-walled high pressure (HP) drum is one of the most vulnerable components that can suffer from the fatigue damage due to the load-following operation. One way of computing the fatigue damage is through the development of a detailed finite element method (FEM) model of stress distribution in the drum. , However, FEM models are computationally expensive, and therefore, dynamic optimization of the plant operation using the FEM model coupled with the plant-wide model is likely to be computationally intractable.…”

Section: Introductionmentioning

confidence: 99%

“…The thermomechanical stress was calculated considering the notch effect using EN 12952-3. Taler et al , and González-Gómez et al , used both EN 12952-3 and FEM to calculate the drum stress at the drum/downcomer junctions. They observed that other than the specific location at the drum/downcomer junctions that EN 12952-3 already accounts for, there can be additional locations at the drum/downcomer junctions where stress concentration should be evaluated during the start-up process.…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Dynamic Optimization for Optimal Load-Following of Natural Gas Combined Cycle Power Plants under Stress Constraints

Wang

Bhattacharyya

Turton

2021

Ind. Eng. Chem. Res.

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With the increasing penetration of intermittent renewable energy sources into the electric grid, there is an associated need for conventional thermal power plants that are designed to operate at base-load conditions to cycle their load rapidly and frequently and operate under low-load conditions. Fast load-following operations lead to plant efficiency loss and the reduction of equipment life. A high-fidelity dynamic model of a natural gas combined cycle power plant, with rigorous equipment level submodels, is developed to capture the plant transient performance and the thermomechanical stress evolution at the high-pressure drum is computed to assess the drum life consumption. Stress evolution is modeled for the location of the edge at the drum/downcomer junction that experiences high circumferential stress amplitude during the fast load-following operation, leading to higher fatigue damage than locations considered under existing design standards. A dynamic optimization problem is solved for optimal load-following operation. Depending on the value of the stress constraint and the desired ramp rate, satisfying the desired stress constraint may be infeasible without relaxing the ramp rate. A multiobjective dynamic optimization problem is solved using a lexicographic approach that minimizes ramp rate relaxation and maximizes efficiency while satisfying stress constraints, avoiding spraying to saturation, and maintaining main steam and reheat steam temperature within bounds. It was observed that the optimal ramp rate can be highly nonlinear as opposed to the industry-standard linear ramp rate. Nonlinear optimal ramp-rate profiles not only help to avoid stress constraints that may be unavoidable by using the linear profile but also result in higher efficiency than the linear profile. The study shows that there is a strong tradeoff between the relaxation in the plant ramp rate and the time-average thermal efficiency.

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“…Their results showed an increase up to 40% of the operational and maintenance costs of a conventional 400 MWe thermal plant, in the case of high penetration of variable renewable energies. González-Gómez et al [18,19] analyzed the dynamic performance and the lifetime of the SG of a parabolic trough power plant. The creep damage was neglected due to the low working temperatures of the SG.…”

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confidence: 99%

Lifetime analysis of the steam generator of a solar tower plant

González-Gómez

Gómez-Hernández

Briongos

et al. 2019

Applied Thermal Engineering

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Solar tower plants are pushed to operate with fast start-ups and/or load changes to increase their dispatchability and competitiveness. However, this operation mode decreases the lifetime on components like the steam generator due to fatigue damage. Moreover, the high operating temperatures typical of solar tower plants also lead to creep damage, which it is combined with fatigue. Both damage mechanisms may lead to a dramatic reduction of the steam generator lifetime, compromising the power plant economic viability.In this work the lifetime of the steam generator of a solar tower plant is investigated. For that purpose, an elastic-plastic approach is used to consider the material cyclic hardening. The results show that the steam generator formed by shell-and-tube heat exchangers can operate during 25 years with temperature change rates up to 150ºC/h, assuming 300 start-ups per year. The most critical point is the superheater head-nozzle junction for both intermittent and continuous operation regimes. An optimization of the superheater head thickness is performed to maximize its lifetime in both regimes. Finally, it can be concluded that temperature change rates higher than 150ºC/h may require a different design of the superheater head and/or a material with better creep-fatigue properties.

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Dynamic performance and stress analysis of the steam generator of parabolic trough solar power plants

Cited by 18 publications

References 33 publications

Review on Performance Analysis of the Power Block in Concentrated Solar Power Plants

Review on Performance Analysis of the Power Block in Concentrated Solar Power Plants

Multiobjective Dynamic Optimization for Optimal Load-Following of Natural Gas Combined Cycle Power Plants under Stress Constraints

Lifetime analysis of the steam generator of a solar tower plant

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