Abstract
Auxiliary Cooling Water System (ACWS) on Gas turbine Blok 1 No 3 Muara Karang has declined its reliability because of 4 fan radiators must be operated due to increasing ambient air temperature and increase inspection interval from 8000 to 32.000 EOH after Upgrade in turbine part. This study aims to optimize Radiator ACWS performance by increasing the cooling fan air mass flow by changing the fan blade angle so it can be operated with 3 fan on and 1 fan standby. This research began with taking data each measurement at 11°, 13°, 15°, 17°, and 19°. Then, it will simulated by software to know the influence of air mass flow addition due to the change of the blade fan angle to the radiator water outlet temperature and to know the input operating parameters when the temperature outlet radiator is 46°C. The results of this study is validation of experimental and numerical data calculations that have errors below 5%. The maximum angle of fan blade can be set until 19°. At 16.7° with operation 3 of 4 fan on, radiator temperature output is 46° and heat disposed is 627.2 kW where this value is the same value as the current condition.
Highlights
Auxiliary Cooling Water System (ACWS) on Gas turbine Blok 1 No 3 Muara Karang has declined its reliability because of 4 fan radiators must be operated due to increasing ambient air temperature and increase inspection interval from 8000 to 32.000 EOH after Upgrade in turbine part
By increasing inspection interval GTG1.3 as seen in fig 1, it is necessary to make maintenance changes on the Auxiliary equipment GTG.13 so that during the operation of 32,000 hours it is attempted to have no interference from the auxiliary equipment that make the performance of GTG1.3 down
If one of the cooling fan is turn off and the air temperature ambient is over 34 °C, 3 fan operated cannot able to protect oil lubricant temperature under temperature alarm limit and gas turbine must be decreased its loading until 15-25 MW so that the oil temperature will not be fixed at 73°C Trip temperature
Summary
Auxiliary Cooling Water System (ACWS) on Gas turbine Blok 1 No 3 Muara Karang has declined its reliability because of 4 fan radiators must be operated due to increasing ambient air temperature and increase inspection interval from 8000 to 32.000 EOH after Upgrade in turbine part. This study aims to optimize Radiator ACWS performance by increasing the cooling fan air mass flow by changing the fan blade angle so it can be operated with 3 fan on and 1 fan standby. If one of the cooling fan is turn off and the air temperature ambient is over 34 °C, 3 fan operated cannot able to protect oil lubricant temperature under temperature alarm limit and gas turbine must be decreased its loading until 15-25 MW so that the oil temperature will not be fixed at 73°C Trip temperature Based on this condition, the research is taken by optimizing the cooling fan performance so that the ACWS Radiator is able to discharge the heat at maximum load and the high air temperature of three cooling fans without any increase in oil lubricant temperature. Other studies [5] the influence of angle of attack and hub tip ratio of mass flow rate in axial fan with radial constant speed, using a CFD is obtained by varying the angle of the blade fan 30°C to 70°C and obtaining maximum yield at 45°C to 50°C and starting to decrease with increasing angle of attack
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