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Research Papers

Proposal of a Solar-Coal Power Plant on Off-Design Operation

[+] Author and Article Information
Hui Hong

e-mail: honghui@mail.etp.ac.cn

Hongguang Jin

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
P.O. BOX 2706,
Beijing 100190, P. R. China

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received April 8, 2012; final manuscript received January 4, 2013; published online March 22, 2013. Assoc. Editor: Markus Eck.

J. Sol. Energy Eng 135(3), 031005 (Mar 22, 2013) (11 pages) Paper No: SOL-12-1096; doi: 10.1115/1.4023359 History: Received April 08, 2012; Revised January 04, 2013

In a solar hybrid system, the intermittent solar radiation seriously effects the solar-to-electricity conversion. In this paper, the energy-level mechanism between the concentrated solar heat and the thermal cycle was discussed. The system analysis was taken on a 200 MW coal-fired power plant hybridized with solar heat at approximately 300 °C, where the middle-temperature solar thermal energy was used to preheat the feed water before entering the boiler. With changing solar radiation in typical days, the solar share, the work output and the net solar-to-electricity efficiency of this solar hybrid system were evaluated. The net solar-to-electricity efficiency would be increased by 3–7% points compared to that in a solar-only power plant. An off-design parallel configuration of this hybrid system was proposed, achieving the net annual solar-to-electricity efficiency of 18%. It would expected to be an attractive approach to develop the scale-up mid-temperature solar thermal power technology in the short and midterm.

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Figures

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Fig. 1

Schematic diagram of hybrid system thermal cycle

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Fig. 2

(a) Flowsheet of energy conversion process in solar-only power plant (b) flowsheet of energy conversion process in ISST, and (c) flowsheet of energy conversion process in coal-fired power plant

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Fig. 3

Net solar-to-electricity efficiency variation with different replaced extractions in ISST system

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Fig. 4

Simplified scheme of ISST system

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Fig. 5

(a) Simplified diagram of conventional approach and (b) simplified diagram of parallel approach

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Fig. 6

(a) Monthly DNI and (b) monthly electricity output and collector efficiency with parallel approach

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Fig. 7

(a) Solar collector efficiency variation with DNI and incident angle on July 6th and (b) solar collector efficiency variation with DNI and incident angle on Dec. 25th

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Fig. 8

(a) Solar share variation with DNI and incident angle on July 6th and (b) solar share variation with DNI and incident angle on Dec. 25th

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Fig. 9

Steam extraction variation with solar share

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Fig. 10

(a) Work output enhancement on July 6th and (b) work output enhancement on Dec. 25th

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Fig. 11

(a) Work output variation with DNI (b) work output variation with solar incident angle

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Fig. 12

(a) Coal consumption variation on July 6th and (b) coal consumption variation on Dec. 25th

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Fig. 13

(a) Solar-to-electricity efficiency variation on July 6th and (b) solar-to-electricity efficiency variation on Dec. 25th

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Fig. 14

(a) Solar-to-electricity efficiency variation with DNI and (b) solar-to-electricity efficiency variation with solar incident angle

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