Abstract
Abstract The use of inlet air fogging installation to boost the power for gas turbine engines is widely applied in the power generation sector. The application of fogging to mechanical drive is rarely considered in literature [1]. This paper will cover some considerations relating to its application for gas turbines in ship drive. There is an important evaporative cooling potential throughout the world, when the dynamic data is evaluated, based on an analysis of coincident wet and dry bulb information. This data will allow ships’ gas turbine operators to make an assessment of the economics of evaporative fogging. The paper represents an introduction to the methodology and data analysis to derive the direct evaporative cooling potential to be used in marine gas turbine power output loss compensation.
Highlights
The gas turbine output as well as efficiency strongly depends on the ambient temperature
Cooling the air to the wet bulb temperature will increase the density of the air, increase the air mass flow, and boost the gas turbine engine power and efficiency
A typical inlet air fogging system for gas turbine application consists of a series of high – pressure reciprocating pumps providing demineralized water to an array of fogging nozzles installed in the inlet air duct
Summary
The gas turbine output as well as efficiency strongly depends on the ambient temperature. The detrimental effect of ambient temperature on gas turbine output and efficiency creates problems for operators of as well power generation and mechanical drive units. In hot and dry air regions, gas turbine power output is dramatically reduced because of the reduction in gas turbine air mass flow. This effect is predominant with aero derivative units that are commonly used in the marine drive, see Fig. 1. To compensate a gas turbine output loss when ambient temperature rises, several inlet air cooling technologies are available. In such case, a selection of the climatic design point is of principal importance [3].
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