Abstract
This paper presents briefly on the boiler efficiency evaluation procedures by direct and indirect methods useful in thermal power plants. In the direct method consideration is given to the amount of heat utilized while evaluating the efficiency of the boiler, whereas, indirect method accounts for various heat losses. The boiler efficiency evaluated by direct method is found to be lower than that evaluated by indirect method as per the ASME PTC-4.1 standards. However, the direct method helps the plant personnel to evaluate quickly the boiler efficiency with few parameters and less instrumentation.
Highlights
Energy is the basic need and backbone of human activities in industry, agriculture, transportation, etc
The boiler efficiency loss at exit is due to rise in flue gas temperature, which is controlled by the absorption of heat in the primary and secondary air pre-heaters [8, 9]
This paper deals with the evaluation of boiler efficiency by direct method as well as indirect method and presenting their limitations
Summary
Energy is the basic need and backbone of human activities in industry, agriculture, transportation, etc. The primary units of a coal-fired thermal power plant (Figure-1) are fuel handling system, boiler, turbine and generator and cooling system. The generated steam in the boiler under pressure flows through a super-heater and rises its temperature above water boiling point. The dry super-heated steam enters the turbine to drive the generator for producing electricity, and flows to the condenser for further use as boiler feed-water. This process completes its cycles from water to steam and back to water. The boiler efficiency loss at exit is due to rise in flue gas temperature, which is controlled by the absorption of heat in the primary and secondary air pre-heaters [8, 9]. This paper deals with the evaluation of boiler efficiency by direct method as well as indirect method and presenting their limitations
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