Combined cycle solar power with powder circulation systems
Başlık çevirisi mevcut değil.
- Tez No: 779779
- Danışmanlar: PROF. DR. JAN DèGREVE, PROF. DR. JAN BAEYENS
- Tez Türü: Yüksek Lisans
- Konular: Kimya Mühendisliği, Chemical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2017
- Dil: İngilizce
- Üniversite: Katholieke Universiteit Leuven (Catholic University of Leuven)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 85
Özet
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Özet (Çeviri)
The state-of-the-art Solar Power Tower (SPT) plants use molten salts as heat carrier that have low and high temperature limitations of 250◦C and 560◦C, respectively. The development of SPT technology using powder circulation loops as heat carrier eliminates any temperature limitation and high feed temperatures offer opportunities to apply advanced conversion techniques such as combined cycle power generation (Brayton cycle using pressurized gas combined with steam-Rankine cycle). So far, powders at 850◦C were obtained at the solar receivers [1], and this will be the feed temperature of the combined cycle. The first equipment in the cycle is the fluidized bed air heater, which needs to heat the compressed air as much as possible to obtain high cycle efficiencies and to limit the back-up fuel used. For this reason, heat transfer mechanisms were investigated in such heat exchangers both experimentally and from modeling apporaches. The experiments were done in a shallow fluidized bed with horizontal finned tube and with 85µm sand as bed material. A maximum bed-to-wall heat transfer coefficient (HTC) is obtained between 3060-3193 W/m2K. An empirical correlation was developed between the finned tube HTC and bare tube HTC as in Section 4.2. As heat transfer enhancement technique, stainless steel sponge with 97% porosity was inserted inside the tube. This almost doubled the internal HTC. However, the pressure drop increased from 1200 Pa/m to 4900 Pa/m at 30 m/s air velocity. In the last part of the thesis, an optimum design for the air heater, that needs to heat compressed air from 270◦C to 710◦C, and having a heat load of 3149 kW is proposed. As the bed material, cristobalite with mean particle size 40µm is selected. A 2m long cross-flow heat exchanger having 3 baffles and 461 externally finned, internally twin-bore pipes, each single pipe having an ID of 10.75 mm, is considered as an optimum design. The total pressure drop was also calculated as 67.23 mbar, which is below the compressor manufacturers constraint of 300 mbar.
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