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Acetylene (C2H2) is heated in a heat exchanger from 20̊C to 220̊C. Stack gas at 1500̊C...

Acetylene (C2H2) is heated in a heat exchanger from 20̊C to 220̊C. Stack gas at 1500̊C containing 50% CO2 with the balance N2, is used to heat the stream of acetylene (100mol/s). Complete an enthalpy table, and calculate the flow rate(mol/s) of stack gas if it exits the heat exchanger at 1400̊C.

Use only the first two terms for Cp (i.e., Cp= a + bT). Units of Cp are kJ/(moloC)

C2H2: a= 42.43x10^-3, b=6.053x10^-5

CO2: a= 36.11x10^-3, b=4.233x10^-5

N2: a= 29.00x10^-3, b= 0.2199x10^-5

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Answer #1

heat lost by stack gas=

to find flow rate of stack gas we will do enthalpy balance

Heat gain by acetylene= heat lost by stack gas

993.872= 0.5*m*12.96771

m=153.28 mol/ sec ( which is our answer)

Heat gain by acetylene=heat lost by stack gas= 993.872 KJ

  

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