Concept explainers
(a)
Interpretation:
The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat
Concept introduction:
From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.
(b)
Interpretation:
The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.
Concept introduction:
In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.
(c)
Interpretation:
Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.
Concept introduction:
In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.
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