A boiler plant comprises a boiler, superheater, economizer and air preheater. The feedwater enters the economizer at

A boiler plant comprises a boiler, superheater, economizer and air preheater. The 

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feedwater enters the economizer at 45 °C. Air is preheated from a temperature of 15C to 150 °C. The steam is generated in the boiler at a pressure of 35 bar, 0.98 dry and leaves the superheater at 350 °C. When using oil of calorific value 42 MJ/kg, the evaporation rate is 10 kg steam per kg fuel and the air to fuel ratio is 20 : 1 by mass. Neglecting heat losses and pressure drops, estimate the heat transfer per kg fuel in each and the plant efficiency. Assume c, for air and flue gas as 1.005 and 1.045 k/ kg K. respectively. [Ans. 7plant = 0.696] component feedwater enters the economizer at 45 °C. Air is preheated from a temperature of 15C to 150 °C. The steam is generated in the boiler at a pressure of 35 bar, 0.98 dry and leaves the superheater at 350 °C. When using oil of calorific value 42 MJ/kg, the evaporation rate is 10 kg steam per kg fuel and the air to fuel ratio is 20 : 1 by mass. Neglecting heat losses and pressure drops, estimate the heat transfer per kg fuel in each and the plant efficiency. Assume c, for air and flue gas as 1.005 and 1.045 k/ kg K. respectively. [Ans. 7plant = 0.696] component

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Given data c p of air c p a 1005 kJkgk1005 Jkg Air preheater inlet temperature T i 15 o c Air ... View the full answer