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Gas turbine efficiency enhancement using absorption chiller. Case study for Tashkent CHP

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  • Matjanov, Erkinjon

Abstract

Ambient conditions affect the performance of the gas turbine cycle. Calculations of 28.1 MW gas turbine in Tashkent CHP show, the gas turbine power output is decreased down to 24.1 MW while ambient temperature is +45 °C, simultaneously electrical efficiency is reduced from 34.2% to 32.0%. An absorption chiller is proposed to cool the inlet air. To drive the cooling process the absorption chiller is analyzed to use three types of a heat source: gas turbine waste gases, HRSG waste gases, solar energy. 4260 kW heat is required to cool the inlet air from +45 °C to +15 °C. Obtained results show, that using the heat of gas turbine waste gases in absorption chiller could not be economical profitable, because CHP efficiency is reduced from 81.4% to 74.4% during ambient temperature +45 °C. Technical-economical attractive is the scheme of using HRSG waste gases in absorption chiller. In this case all data, including performance of the gas turbine, the HRSG as well as the CHP, are maintained in nominal values. In order to provide the absorption chiller with solar energy heat, parabolic trough collectors with total net aperture area 8064 m2 are required. Analyses show, when HRSG waste gases have enough heat to provide cooling process, so no need in additional solar field. But however, the solar field can be economical profitable when HRSG waste gases don’t have enough heat, i.e. temperature of HRSG waste gases is lower than +120 °C.

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  • Matjanov, Erkinjon, 2020. "Gas turbine efficiency enhancement using absorption chiller. Case study for Tashkent CHP," Energy, Elsevier, vol. 192(C).
    • Handle: RePEc:eee:energy:v:192:y:2020:i:c:s0360544219323205
    DOI: 10.1016/j.energy.2019.116625
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    References listed on IDEAS

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    Cited by:

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    5. Hong-Hai Niu & Yang Zhao & Shang-Shang Wei & Yi-Guo Li, 2021. "A Variable Performance Parameters Temperature–Flowrate Scheduling Model for Integrated Energy Systems," Energies, MDPI, vol. 14(17), pages 1-25, August.
    6. Alvaro A. S. Lima & Gustavo de N. P. Leite & Alvaro A. V. Ochoa & Carlos A. C. dos Santos & José A. P. da Costa & Paula S. A. Michima & Allysson M. A. Caldas, 2020. "Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications," Energies, MDPI, vol. 14(1), pages 1-41, December.
    7. Zhao, Liang & Zhang, Jiulei & Wang, Xiu & Feng, Junsheng & Dong, Hui & Kong, Xiangwei, 2020. "Dynamic exergy analysis of a novel LNG cold energy utilization system combined with cold, heat and power," Energy, Elsevier, vol. 212(C).
    8. Dabwan, Yousef N. & Zhang, Liang & Pei, Gang, 2023. "A novel inlet air cooling system to improve the performance of intercooled gas turbine combined cycle power plants in hot regions," Energy, Elsevier, vol. 283(C).

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