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Chapter 4.1 - Boilers

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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1. ENERGY PERFORMANCE ASSESSMENT OF BOILERS 1.1 Introduction Performance of the boiler, like efficiency and evaporation ratio reduces with time, due to poor combustion, heat transfer fouling and poor operation and maintenance. Deterioration of fuel quality and water quality also leads to poor performance of boiler. Efficiency testing helps us to find out how far the boiler efficiency drifts away from the best efficiency. Any observed abnormal deviations could therefore be investigated to pinpoint the problem area for necessary corrective action. Hence it is necessary to find out the current level of efficiency for performance evaluation, which is a pre requisite for energy conservation action in industry. 1.2 Purpose of the Performance Test To find out the efficiency of the boiler To find out the Evaporation ratio The purpose of the performance test is to determine actual performance and efficiency of the boiler and compare it with design values or norms. It is an indicator for tracking dayto-day and season-to-season variations in boiler efficiency and energy efficiency improvements 1.3 Performance Terms and Definitions 1. Boiler Efficiency, = 2. Evaporation Ratio Heat output x100 Heat input = Heat in steam output (kCals) x100 Heat in fuel input (kCals ) = Quantity of steam generation Quantity of fuel consumption 1.4 Scope The procedure describes routine test for both oil fired and solid fuel fired boilers using coal, agro residues etc. Only those observations and measurements need to be made which can be readily applied and is necessary to attain the purpose of the test. Bureau of Energy Efficiency 1

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