Zongming Y. Increasing the efficiency of gas turbine unit cyclic air cooling in subtropical conditions of the central China

ABSTRACT Zongming Y. Increasing the efficiency of gas turbine unit cyclic air cooling in subtropical conditions of the central China. − Manuscript. The dissertation for the scientific degree of the candidate of technical sciences on speciality 05.05.03 – Engines and power plants.– Admiral Makarov National University of Shipbuilding, Mikolayiv, 2021. The dissertation is devoted to increasing the efficiency of gas turbine units in subtropical climate of central China through rational organization of intake air deep cooling processes. The peculiarities of the character of heat load variation during gas turbine intake air cooling in the subtropical climate of central China at both high temperatures and relative humidity of ambient air, and the character of annual fuel saving increment respectively, that consist in closing in the maximum rate of annual fuel saving increment and the maximum value of annual fuel saving, are reveiled. The approach to determine a design refrigeration capacity of waste heat recovery turbine intake air cooling system (TIACS) according to the maximum rate of annual fuel saving increment based on the peculiarities and differed from more complicated calculation, issued from the maximum annual fuel saving used for a temperate continental climate, has been developed. The method to determine a design refrigeration capacity (heat load) of TIACS at the maximum rate of annual fuel saving increment provides its value (TIACS sizes) reduced by 15…20% compared to the value calculated according to the maximum current heat load, as accepted in the design practice. An improved mathematical model of turbine intake air cooling (TIAC) processes to conduct the proposed method is developed. The TIAC processes are developed and their rational parameters are defined to provide a reduction in specific fuel consumption by 6...10 g/kWh (2…3%) and in installed refrigeration capacity more than 10…15% compared with traditional design practice in the subtropical climatic conditions of central China. The system of deep TIAC (down to 10 ºС and below) in absorption lithium-bromide chiller and refrigerant ejector chiller consecuently are developed that provides 15…20% additional annual fuel saving compared with cooling air to 15 ºС in absorption chiller in the subtropical climate of central China. Key words: gas turbine, intake air, heat load, fuel consumption, subtropical climate.