13. Heat Exchanger Design
Design: - Shell and Tube type heat exchanger
Design pressure: - By additional of 5% to the
maximum working pressure.
Design temperature: - 10˚C higher than the
maximum temperature. ABE, 10atm
5˚C, 402 kg/hr
Water, 1atm Water, 1atm
102˚C, 10.3 kg/hr 90˚C, 10.3 kg/hr
ABE, 10atm
39˚C, 402 kg/hr
14.
15.
16. • No. of tube passage Np = 4
• For triangular arrangement: - Db (tube bundle
diameter)
• Db= do(Nt/k1)1/h1
• K1 and h1 are constant
• Pt/do = 1.25, for this arrangement
• K1=0.175, h1=2.285
• Db =373.31mm
• Di = Db+C = 390mm
• C= 10-20mm for U-tube heat exchanger
26. Fermenter Reactor:-
• Assume:-
• L/D=6
• Volume of the reactor =
• Volume of one Reactor= 50000 L
• So,
Dia. Of Reactor(d)= 22m.
27. Holding Tank:- Process Design
• Usually we must design the storage tank which has volume more than the
reactor.
• Volume of vessel = 55,555L
• Assume,
• Ratio of
• So,
• Dia. (d)=34m.
• Length(L)=68m.
28. Mechanical Design
• Operating condition :-
• Pressure = 1atm, Temp.=33˚C, L = 68m., d = 34m.
Sp. gravity of liquid = 1
• Fixed conical roof
• Slope permissible = 1 in 5
• Superimposed load = 1250
• Material = CS (structural) IS-2062
• Permissible stress = 142
• Density = 1000
• Modulus of elasticity =
29. Continued…
• This design is based on the Indian std. design IS-803.
• Corrosion allowance (c) = 0.7mm
• Shell design
Internal pressure
• p = 0.677
• Thickness of the shell at bottom:
• t = 96mm.
30. Continued…
• Butt joints are provided for welding the vertical joints between plates to
form the lowest layer of the shell. An allowance of 2mm. is made between
two adjacent plate to facilitate welding and total circumference is welded
with 16 plates.so
• Length of the each plate = 6.67m.
• Size of the plate selected from IS-1730 is 6700mm.
(length)*2000mm(width).
• To determine the number of the layers to be used with 16mm thick plate it
is necessary to determine the height of up to which a plate of lesser
thickness on be used.
• Assuming thickness of 75 mm. so
31. Continued…
• Bottom diameter ( Db )=
• Db= 34.192m
• Circumference of bottom = 3.14*Db
= 107.36m