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

Erkinjon Matjanov

Energy, 2020, vol. 192, issue C

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.

Keywords: Gas turbine efficiency; Inlet air cooling; Absorption chiller integrated gas turbine; Inlet air cooling by solar energy; Solar powered absorption chiller (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:192:y:2020:i:c:s0360544219323205

DOI: 10.1016/j.energy.2019.116625

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