1) a. What is the flow rate P of brine in kg/h b. What is the total flow of wate
ID: 717864 • Letter: 1
Question
1)
a. What is the flow rate P of brine in kg/h
b. What is the total flow of water leaving all of the evaporators Wtotal in kg/h
c. What is the flow of water W2 in kg/h
d. What is the flow of water W1 in kg/hr
F 1000 kg/h p ke/h ,5 kg salt/kg .| Evaporator 21 Evaporator I 0.90 kgH,o/kg Wos kg H2O/h salt solution in water containing 10% salt by weight is evaporated in a series of two evaporators. The concentrated salt solution from the first evaporator is then fed into the 2nd evaporator where it is further concentrated Evaporator 2 removes half as much of the water as compared with evaporatorExplanation / Answer
Overall mass balance
F = W + P
1000 = W + P
Overall Salt balance
F x 0.10 = W x 0 + P x 0.5
1000 x 0.10 = P x 0.5
P = 200 kg/h
W = 1000 - P = 1000 - 200 = 800 kg/h
Total water evaporated = water from evaporator1 + water from evaporator2
800 = W1 + W2
Given that evaporator 2 removes half water as in evaporator1
W2 = W1 / 2 = 0.5W1
800 = W1 + 0.5 W1
W1 = 533.33 kg/h
W2 = 266.67 kg/h
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