(3.2.) Combustion products at 600 K are to be mixed with the incoming air to lower the NO emissions from the furnace in Problem 3.1. Assuming that the total mass flow rate through the furnace docs not change, determine what fraction of the flue gases must be recycled to reduce NO, formation by 90%. What is the corresponding change in the amount of heat that can be transferred to a process requiring a temperature of 600 K? Hease do 3 2

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solve 3.2 given in the image provided.

3.1. A furnace is fired with natural gas (assume methane). The inlet air and fuel temperatures are
290 K and the pressure is atmospherie. The residence time in the combustor is 0.1 s. As-
suming the combustion to be adiabatic, calculate the NO mole fraction at the combustor
outlet for combustion at o = 0.85.
(3.2.) Combustion products at 600 K are to be mixed with the incoming air to lower the NO
emissions from the furnace in Problem 3.1. Assuming that the total mass flow rate through
the furnace does not change, determine what fraction of the flue gases must be recycled to
reduce NO, formation by 90%. What is the corresponding change in the amount of heat that
can be transferred to a process requiring a temperature of 600 K?
Please do #3.2
Transcribed Image Text:3.1. A furnace is fired with natural gas (assume methane). The inlet air and fuel temperatures are 290 K and the pressure is atmospherie. The residence time in the combustor is 0.1 s. As- suming the combustion to be adiabatic, calculate the NO mole fraction at the combustor outlet for combustion at o = 0.85. (3.2.) Combustion products at 600 K are to be mixed with the incoming air to lower the NO emissions from the furnace in Problem 3.1. Assuming that the total mass flow rate through the furnace does not change, determine what fraction of the flue gases must be recycled to reduce NO, formation by 90%. What is the corresponding change in the amount of heat that can be transferred to a process requiring a temperature of 600 K? Please do #3.2
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