Simultaneous solution and enthalpy composition diagram
1. Calculate hf(TF,z)
2. Guess the value of TDrum
3. Calculate x and y from the equilibrium equations or you can use
temperature composition chart
4. Find L and V by solving mass balance equation or graphically by calculating
L/V from graph
5. Calculate hL (Tdrum, x) and Hv(TDrum, y) from below equations or from
enthalpy composition chart.
6. Is the following being satisfied
FhF + Qflash = VHv + LhL
Simultaneous solution and enthalpy composition diagram
For binary flash distillation, simultaneous process can be easily carried out on enthalpy
composition chart.
1. First calculate feed enthalpy
2. Then plot the feed point on the following chart
It could be little tricky, be
You can have values of Tdrum, true
sure that isotherm passes
values of x and y of a system which
through feed point, and you
is in equilibrium
may need to do a minor hit
and trial to see actual values
of x and y
So you can conveniently calculate L
and V as well by applying material
balance.