Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

Eck, Markus; Steinmann, W.-D.

doi:10.1115/sed2001-155

Cited by 12 publications

(12 citation statements)

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“…However, the PTR70 absorber tube used in the indirect steam plant cannot withstand the high‐pressure steam. As a result, the same manufacturer (Schott) who made the PTR70 came up with PTR80‐DSG, a new absorber tube that is able to withstand pressure of up to 150 bar including an allowance for pressure vibrations . The main difference between the 2 absorbers is the wall thickness, as the DSG absorber needs to be thicker than the oil absorber to withstand high pressure in the loops.…”

Section: Power Generation Systems' Descriptionmentioning

confidence: 99%

Analysis of an innovative direct steam generation-based parabolic trough collector plant hybridized with a biomass boiler

2017

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Summary Direct steam generation (DSG) is the process by which steam is directly produced in parabolic trough fields and supplied to a power block. This process simplifies parabolic trough plants and improves cost effectiveness by increasing the permissible temperature of the working fluid. Similar to all solar‐based technologies, thermal energy storage is needed to overcome the intermittent nature of solar. In the present work, an innovative DSG‐based parabolic trough collector (PTC) plant hybridized with a biomass boiler is proposed and analyzed in detail. Two additional configurations comprising indirect steam generation PTC plants were also analyzed to compare their energy and exergy performance. To consider a wide range of operation, the share of biomass input to the hybridized system is varied. Energy and exergy analyses of DSG are conducted and compared with an existing indirect steam generation PTC power plants such as Andasol. The analyses are conducted on a 50 MW regenerative reheat Rankine cycle. The results obtained indicate that the proposed DSG‐based PTC plant is able to increase the overall system efficiency by 3% in comparison with indirect steam generation when linked to a biomass boiler that supplies 50% of the energy.

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Section: Power Generation Systems' Descriptionmentioning

confidence: 99%

Analysis of an innovative direct steam generation-based parabolic trough collector plant hybridized with a biomass boiler

2017

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“…Reactions (1), (2) and (5) and the processes in tables 1 and 2 indicate that the heat required by the processes can be categorized into three types: latent heat for steam generation, sensible heat for the preheating or superheating of steam and other reactants, and reaction enthalpy. As steam generation does not require a very high temperature, it makes the usage of solar thermal energy easier, because solar boiler technology has been very close to maturity and steam generation systems of different industrial scales have been operational [25][26][27].…”

Section: Reactor Type and Cycle Layoutmentioning

confidence: 99%

Integrated fossil fuel and solar thermal systems for hydrogen production and CO2 mitigation

Wang

Naterer

2014

International Journal of Hydrogen Energy

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In most current fossil-based hydrogen production methods, the thermal energy required by the endothermic processes of the hydrogen production process is supplied by the combustion of a portion of the same fossil fuel feedstock. This increases the fossil fuel consumption and greenhouse gas emissions. This paper analyzes the thermodynamics of several typical fossil fuel-based hydrogen production methods such as steaam methane reforming, coal gasification, methane dissociation, and off-gas reforming, to quantify the potential savings of fossil fuels and CO2 emissions associated with the thermal energy requirement. Then matching the heat quality and quantity by solar thermal energy for different processes is examined. It is concluded that steam generation and superheating by solar energy for the supply of gaseous reactants to the hydrogen production cycles is particularly attractive due to the engineering maturity and simplicity. It is also concluded that steam-methane reforming may have fewer engineering challenges because of its single-phase reaction, if the endothermic reaction enthalpy of syngas production step (CO and H2) of coal gasification and steam methane reforming is provided by solar thermal energy.Various solar thermal energy based reactors are discussed for different types of production cycles as well.

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“…Direct steam generation (DSG) PT systems are ready to enter the market and a first commercial plant with steam parameters of 35 bar / 340 °C has gone into operation in Thailand by the end of 2011 [5]. DLR demonstrated collector operation at 500 °C in a Spanish test facility [6].…”

Section: Thermodynamic Cyclementioning

confidence: 99%

Energetic Comparison of Linear Fresnel and Parabolic Trough Collector Systems

Schenk

Hirsch

Feldhoff

et al. 2014

Journal of Solar Energy Engineering

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In recent years, linear Fresnel (LF) collector systems have been developed as a technical alternative to parabolic trough (PT) collector systems. While in the past, LF systems focused on low- and medium-temperature applications, today, LF systems are equipped with vacuum receivers and, therefore, can be operated with similar operating parameters as PT systems. Papers about the technical and economical comparison of specific PT and LF systems have already been published (Dersch et al., 2009, "Comparison of Linear Fresnel and Parabolic Trough Collecor Systems—System Analysis to Determine Break-Even Costs of Linear Fresnel Collectors," Proceedings of the 15th International SolarPACES Symposium, Berlin; Giostri et al. 2011, "Comparison of Two Linear Collectors in Solar Thermal Plants: Parabolic Trough vs. Fresnel," ASME 2011 5th International Conference on Energy Sustainability, Washington, DC; and Morin et al., 2012, "Comparison of Linear Fresnel and Parabolic Trough Collector Power Plants," Sol. Energy, 86(1), pp. 1–12). However, the present paper focuses on the systematic differences in optical and thermodynamic performance and the impact on the economic figures. In a first step the optical performance of typical PT and LF solar fields (SFs) has been examined, showing the differences during the course of the day and annually. Furthermore, the thermodynamic performance, depending on the operating temperature, has been compared. In a second step, the annual electricity yield of typical PT and LF plants has been examined. Solar Salt has been chosen as the heat transfer fluid. Both systems utilize the same power block (PB) and storage type. Solar field size, storage capacity, and PB electrical power are variable, while all examined configurations achieve the same annual electricity yield. As expected for molten salt systems, both systems are the most cost-effective with large storage capacities. The lower thermodynamic performance of the LF system requires a larger SF and lower specific SF costs in order to be competitive. Assuming specific PT field costs of 300 €/m2 aperture, the break-even costs of the LF system with Solar Salt range between 202 and 235 €/m2, depending on the site and storage capacity. In order to confirm the major statements, within a sensitivity analysis, it is shown that a variation of SF and storage costs does not have a significant impact on the relative break-even costs of the LF system.

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Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

Cited by 12 publications

References 0 publications

Analysis of an innovative direct steam generation-based parabolic trough collector plant hybridized with a biomass boiler

Analysis of an innovative direct steam generation-based parabolic trough collector plant hybridized with a biomass boiler

Integrated fossil fuel and solar thermal systems for hydrogen production and CO2 mitigation

Energetic Comparison of Linear Fresnel and Parabolic Trough Collector Systems

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