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Which of the following boilers has the highest heat transfer capacity?(a) Subcritical boiler(b) Critical boiler(c) Forced circulation boiler(d) Supercritical boilerI had been asked this question in a national level competition.This is a very interesting question from Types of High Pressure Boilers in section Steam Generators & Accessories of Energy Engineering |
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Answer» RIGHT choice is (d) Supercritical boiler To elaborate: The heat transfer rates of supercritical boilers are large compared to any other boilers. The steam SIDE heat transfer of SUBCRITICAL is 165000 kJ/m^2hr^oc when the steam pressure and temperature are 180 bar and 538^oC whereas, the steam side heat transfer COEFFICIENTS of supercritical boiler is about 2,20,200 kJ/m^2hr^oC when the steam is generated at 240^oC. |
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