Abstract
The general trend to improve the fuel efficiency of gas turbines (GT) at increased ambient temperatures is turbine intake air cooling (TIAC) by exhaust heat recovery chillers The high efficiency absorption lithium-bromide chillers (ACh) of a simple cycle are the most widely used, but they are not able to cool intake air lower than 15°C because of a chilled water temperature of about 7°C. A two-stage hybrid absorption-ejector chillers (AECh) were developed with ejector chiller as a low temperature stage to provide deep air cooling to 10°C and lower. A novel trend in TIAC by two-stage air cooling in chillers of hybrid type has been proposed to provide about 50% higher annual fuel saving in temperate climatic conditions as compared with ACh cooling. The advanced methodology to design and rational distribute the cooling capacity of TIAC systems that provides a closed to maximum annual fuel reduction without oversizing was developed.
Highlights
The efficiency of gas turbines (GT) decreases with arising the ambient air temperature at their inlet [1, 2]
The purpose of the study is to develop the advanced hybrid turbine intake air cooling (TIAC) systems and the improved methodology of their designing with rational distribution of the overall design cooling capacity between unstable ("turbulent") thermal load range for ambient air precooling in the boost high temperature stage of the air cooler (AC) by absorption lithium-bromide chillers (ACh) and a stable ("laminarized") load range for further air subcooling to the target temperature in the low temperature stage by ECh that provides practically twice reduction of a design boost thermal load and about 50% higher annual fuel saving as compared with ACh gained due to applications of TIAC systems with hybrid absorption-ejector chillers (AECh)
The further development of the methodology of TIAC system designing involves distribution of the overall design cooling capacity between unstable ("turbulent") thermal load range for ambient air precooling in the boost high temperature stage of the air cooler (AC) by ACh and a stable ("laminarized") load range for further air subcooling to the target temperature in the low temperature stage by ECh (Fig. 2)
Summary
The efficiency of gas turbines (GT) decreases with arising the ambient air temperature at their inlet [1, 2]. The cooling capacity of the chillers is to be designed to cover the thermal "turbulences" by the absorption lithiumbromide chiller (ACh) chillers with a high coefficient of performance (COP) not effected by load fluctuations considerably [8]. The further air subcooling takes place within the comparatively stable "laminarized" thermal load range) and can be covered by ejector chiller (ECh) as the most simple in design and cheapest but considerably effected by load changes [9]. The application of such hybrid absorption-ejector chiller (AECh) enables to cover actual loading in two-stage air cooler with boost high temperature water stage and low temperature refrigerant stage [10]
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