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Research Papers

Hybrid Solar and Coal-Fired Steam Power Plant Based on Air Preheating

[+] Author and Article Information
Shimin Deng

Hatch
2800 Speakman Drive,
Mississauga, ON L5K 2R7, Canada
e-mail: bdeng@hatch.ca

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received January 13, 2013; final manuscript received May 30, 2013; published online September 19, 2013. Assoc. Editor: Markus Eck.

J. Sol. Energy Eng 136(2), 021012 (Sep 19, 2013) (7 pages) Paper No: SOL-13-1019; doi: 10.1115/1.4024932 History: Received January 13, 2013; Revised May 30, 2013

In this paper, a hybrid solar and coal-fired steam power plant with secondary air preheating is proposed, which has much higher thermal efficiency than existing hybrid solar and coal-fired power generation systems. Five cases in total are modeled using GateCycle™. The simulation indicates that the solar-to-power efficiency of the new system is 5.5–6.5% points higher than solar-feedwater (HP) systems. The performance of the base case is compared with other cases to identify the potentials of the new system. Thermodynamic analysis is carried out and bleed steam heat-to-power conversion ratios are calculated for comparison. In addition, boiler operating parameters are investigated and fuel saving mode and power boost mode are compared.

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Figures

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Fig. 1

Hybrid solar and coal-fired steam power plant based on air preheating

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Fig. 2

Hybrid solar and coal-fired steam power plant based on feedwater heating

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Fig. 3

t–s diagram of steam cycle

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Fig. 4

Solar energy and stack temperature versus bypass air

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Fig. 5

Efficiency versus bypass air

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Fig. 6

Steam temperature and solar energy versus excess air

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Fig. 7

Efficiency versus excess air

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Fig. 8

Stack temperature versus excess air

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Fig. 9

Efficiency and bypass air versus excess air (fuel saving mode)

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Fig. 10

Secondary air flow rate versus excess air

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Fig. 11

Efficiency and bypass air versus excess air (power boost mode)

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