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Research Papers: Alternative Energy Sources

Performance Analysis of Integrated Solar Tower With a Conventional Heat and Power Co-Generation Plant

[+] Author and Article Information
Esmail M. A. Mokheimer

Mem. ASME
Mechanical Engineering Department,
College of Engineering,
King Fahd University of Petroleum and
Minerals (KFUPM),
P. O. Box: 279,
Dhahran 31261, Saudi Arabia;
Center of Research Excellence in Energy
Efficiency (CEEE),
King Fahd University of Petroleum
and Minerals (KFUPM),
P. O. Box: 279,
Dhahran 31261, Saudi Arabia;
Center of Research Excellence in Renewable
Energy (CoRe-RE),
King Fahd University of Petroleum and
Minerals (KFUPM),
P. O. Box: 279,
Dhahran 31261, Saudi Arabia
e-mail: esmailm@kfupm.edu.sa

Yousef N. Dabwan

Mechanical Engineering Department,
College of Engineering,
King Fahd University of Petroleum and
Minerals (KFUPM),
P. O. Box: 279,
Dhahran 31261, Saudi Arabia;
Department of Thermal Science
and Energy Engineering,
University of Science and Technology of China,
No. 96, JinZhai Road Baohe District,
Hefei 230026, Anhui, China
e-mail: g200805860@kfupm.edu.sa

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 24, 2018; final manuscript received August 24, 2018; published online September 26, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 141(2), 021201 (Sep 26, 2018) (13 pages) Paper No: JERT-18-1371; doi: 10.1115/1.4041409 History: Received May 24, 2018; Revised August 24, 2018

This paper presents the results of a thermo-economic analysis of integrating solar tower (ST) with heat and power cogeneration plants that is progressively being installed to produce heat and electricity to operate absorption refrigeration systems or steam for industrial processes. The annual performance of an integrated solar-tower gas-turbine-cogeneration power plant (ISTGCPP) with different sizes of gas turbine and solar collector's area have been examined and presented. Thermoflex + PEACE software's were used to thermodynamically and economically assess different integration configurations of the ISTGCPP. The optimal integrated solar field size has been identified and the pertinent reduction in CO2 emissions due to integrating the ST system is estimated. For the considered cogeneration plant (that is required to produce 81.44 kg/s of steam at 394 °C and 45.88 bars), the study revealed that (ISTGCPP) with gas turbine of electric power generation capacity less than 50 MWe capacities have more economic feasibility for integrating solar energy. The levelized electricity cost (LEC) for the (ISTGCPP) varied between $0.067 and $0.069/kWh for gas turbine of electric power generation capacity less than 50 MWe. Moreover, the study demonstrated that (ISTGCPP) has more economic feasibility than a stand-alone ST power plant; the LEC for ISTGCPP is reduced by 50–60% relative to the stand-alone ST power plant. Moreover, a conceptual procedure to identify the optimal configuration of the ISTGCPP has been developed and presented in this paper.

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Figures

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Fig. 1

(a) Schematic diagram of the CGCPP and (b) schematic diagram of the integrated solar tower gas turbine cogeneration power plant

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Fig. 2

(a) Schematic diagram of the conventional CGCPP as simulated in THERMOFLEX and (b) schematic diagram of the ISTGCPP as simulated in THERMOFLEX

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Fig. 3

Thermal power required from a solar field of a ST system at design hour

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Fig. 4

Thermal power obtained from solar field of ST integrated with different gas turbine sizes

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Fig. 5

Reflective area of a ST system versus land areas

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Fig. 6

Instantaneous solar share for integrating different field sizes of an ST system with different gas turbine sizes

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Fig. 7

Annual solar share for integrating different field sizes of an ST system with different gas turbine sizes

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Fig. 8

Levelized electricity cost for integrating different field sizes of an ST with different gas turbine sizes

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Fig. 9

Solar levelized electricity cost for integrating different field sizes of an ST with different gas turbine sizes

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Fig. 10

Solar field area of ST system at the optimal solar integration for different gas turbine sizes

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Fig. 11

Instantaneous solar share at the optimal solar integration of ST for different gas turbine sizes

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Fig. 12

Annual solar share at the optimal solar integration of ST for different gas turbine sizes

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Fig. 13

Levelized electricity cost for both the conventional gas turbine cogeneration plant and solar gas turbine cogeneration plant (at the optimal ST integration)

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Fig. 14

Solar levelized energy cost at the optimal solar integration of ST for different gas turbine sizes

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Fig. 15

Annual CO2 emissions from both conventional gas turbine cogeneration and solar gas turbine cogeneration plant (at the optimal ST integration)

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Fig. 16

Annual CO2 avoidance at the optimal solar integration of ST for different gas turbine sizes

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Fig. 17

Levelized electricity cost versus annual CO2 emission for different gas turbine sizes integrated with optimal solar integration of ST

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Fig. 18

Total plant efficiency versus annual CO2 emission for different gas turbine sizes integrated with optimal SM of ST

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