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Optimization of Flue Gas Exit Temperature at Air Pre Heater outlet in a 500 MW Unit BHEL Boiler
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(May 17, 2020)

One of the units in NTPC, Ramagundam had been experiencing a high Flue Gas Exit Temperatures at Air Pre Heater (APH) outlet. It was observed that the Average Flue Gas Temperature in the last six months was more than 145 deg C, while the Design Flue Gas Exit Temperature at APH outlet is 125 deg C at rated parameters.

DMAIC (Define, Measure, Analyse, Improve and Control) methodology of Six Sigma Quality Management was adopted as a Performance Improvement Strategy to determine the root cause of the problem and implement the solution thereof. The purpose of this report is to present the results of the team’s problem-solving efforts and explain the solutions adopted.

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