Annual performance improvement for solar steam turbines through the use of temperature-maintaining modifications

Spelling, James; Jöcker, Markus

doi:10.1016/j.solener.2011.10.023

Cited by 22 publications

(11 citation statements)

References 3 publications

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“…For the HBs, the operational penalties relate to the parasitic electricity consumption, which was taken into account and subtracted from the improved annual yield of the CSPP as described in ref. 8. In addition, the costs for the blankets were considered to be proportional to the required HB power Q HB .…”

Section: Scenario Ii: Implementation Of Temperature Maintaining Modifmentioning

confidence: 99%

Towards prioritizing flexibility in the design and construction of concentrating solar power plants

Topel

Lundqvist

Haglind

et al. 2017

AIP Conference Proceedings

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Abstract. In the operation and maintenance of concentrating solar power plants, high operational flexibility is required in order to withstand the variability from the inherent solar fluctuations. However, during the development phases of a solar thermal plant, this important objective is overlooked as a relevant factor for cost reduction in the long term. This paper will show the value of including flexibility aspects in the design of a concentrating solar power plant by breaking down their potential favorable impact on the levelized cost of electricity (LCOE) calculations. For this, three scenarios to include flexibility as a design objective are analyzed and their potential impact on the LCOE is quantified. The scenarios were modeled and analyzed using a techno-economic model of a direct steam generation solar tower power plant. Sensitivity studies were carried out for each scenario, in which the level of improvement due to each scenario was compared to the base case. Then, the results obtained for each scenario were compared for similar levels of LCOE and flexibility improvements. In general, all scenarios were beneficial on power plant performance. Improvements on the LCOE in the range of 3-4% were obtained with different distributions of costs and annual electricity for each case.

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Section: Scenario Ii: Implementation Of Temperature Maintaining Modifmentioning

confidence: 99%

Towards prioritizing flexibility in the design and construction of concentrating solar power plants

Topel

Lundqvist

Haglind

et al. 2017

AIP Conference Proceedings

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“…They used empirical correlation for the efficiency for each section. More detailed transient performance model was written by Spelling et al [12]. They included the glass envelope of the HCE in their PTC model and solved the governing coupled partial differential equations numerically by applying an implicit formulation of the finite difference technique to ensure stability for time steps higher than 5 min.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling for the Thermal Performance of a Solar Parabolic Trough Concentrator (PTC) Under Egypt Climate

Ahmed¹,

Giaconia²,

Amin³

2018

IJTEE

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In this work, an analysis of the annual performance of a parabolic trough concentrator has been accomplished. A numerical model was developed and built to study the annual performance of the parabolic trough collector's field at different locations in Egypt. The energy equations were solved using the Engineering Equation Solver EES software. The optical and thermal parameters of the concentrator were considered in the model. The numerical model results showed that temperature rise ranges from 90.5 to 221 °C and the outlet temperate ranges from 442 to 565 ºC at solar noon according to the season and the location. The operating period of the parabolic concentrator reaches its maximum value at summer where it ranges from 76.5 to 82 h/week. The present model was validated with the TRNSYS model. As a result, the presented model can be considered as a meaningful tool for developing the parabolic trough plant in Egypt.

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“…In previous works by the authors, temperature maintaining modifications for solar steam turbine startup time reduction have been studied [8,10] using the dynamic turbine model. The opera tional modifications that were analyzed involved increasing the turbine insulation thickness, using heat blankets in the casing and increasing the temperature of the injected gland steam.…”

Section: Introductionmentioning

confidence: 99%

“…The combined modifica tions showed an increase in power output of up to 9.5% on the day following a long-CD [8]. In addition, an annual performance improvement of 3.1% for the entire plant was predicted when applying these modifications [10], Other works have also studied means of changing operating procedures to achieve faster startup times [11].…”

Section: Introductionmentioning

confidence: 99%

Operational Improvements for Startup Time Reduction in Solar Steam Turbines

Topel

Genrup

Jöcker

et al. 2015

Journal of Engineering for Gas Turbines and Power

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Solar steam turbines are subject to high thermal stresses as a result of temperature gra dients during transient operation, which occurs more frequently due to the variability of the solar resource. In order to increase the flexibility of the turbines while preserving lift ing requirements, several operational modifications for maintaining turbine temperatures during offline periods are proposed and investigated. The modifications were imple mented in a dynamic thermal turbine model and the potential improvements were quanti fied. The modifications studied included: increasing the gland steam pressure injected to the end-seals, increasing the back pressure and increasing the barring speed. These last two take advantage of the ventilation and friction work. The effects of the modifications were studied both individually as well as in different combinations. The temperatures obtained when applying the combined modifications were compared to regular turbine cool-down (CD) temperatures and showed significant improvements on the startup times of the turbine.

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Annual performance improvement for solar steam turbines through the use of temperature-maintaining modifications

Cited by 22 publications

References 3 publications

Towards prioritizing flexibility in the design and construction of concentrating solar power plants

Towards prioritizing flexibility in the design and construction of concentrating solar power plants

Mathematical Modelling for the Thermal Performance of a Solar Parabolic Trough Concentrator (PTC) Under Egypt Climate

Operational Improvements for Startup Time Reduction in Solar Steam Turbines

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