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Due to prolonged exposure to very high temp. all Gas Turbines irrespective of make and capacity, undergo physical unrecoverable degradation in terms of capacity and Heat Rate.
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Gas Turbine Hot Gas path Critical Components are replaced/refurbished strictly as per OEM’s guidelines. These Components are very costly and users have to spend a lot of money on account of this.
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Combined cycle power plants fire costly fuel such as LNG, HFO,HSD etc. which are costlier than Coal. Hence for minimising losses due to poor operating parameters / conditions and in turn to increase profitability, we should try our best to identify the factors to achieve the desired goal.
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Inspection of Gas Turbine on regular basis is a critical activity and is carried out to ensure the reliability of Gas Turbine during operation. But it cost both in terms of money and loss of Generation. Hence attempt should be made to adopt an innovative practice to optimise the inspection interval.
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Coal fired power plants fire huge quantity of Coal for generation of power. Hence Generators has to spend lot of money for this. But generators, incur huge loss due to poor operating parameters / conditions.
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There have been quite a few cases of emergency lube oil pump failing to cut in and leading to Steam Turbine bearing and other components damage.
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Failures of last stage (long!) blades of LP Steam Turbine are well known in the power plant community. Causes of failure include pitting, erosion, corrosion, fatigue, SCC, fretting and combination of these.
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