Neraca massa pada Spray Dryer
Cp
A
= Heat capacity of moisture, as a liquid kJkg °C X
1
= Mass moisturemass dry solid
H
S1
= Cps Ts
1
-To + X
1
Cp
A
T
S1
– To Dimana, Cps = 0,912 kJkg °C
Cp
A
= 3,717 kJkg °C T
S1
= 50 °C To = 30 °C
X
1
= 0,356 kg moisturekg dry solid Sehingga, didapat H
S1
= 44,705 kJkg dry solid
d. Entalpy umpan ke SC-301 H
S2
= Cps Ts
2
-To + X
2
Cp
A
T
S2
– To Robert E. Treybal, page 700
Diketahui : X
2
= 0,0027 kg moisturekg dry solid spesifikasi produk 0,3 moisture dalam KH
2
PO
4
T
S2
= 90 °C Sehingga, H
S2
= 138,305 kJkg dry solid
e. Entalpy umpan ke CS-301 H
S3
= Cps Ts
3
-To + X
3
Cp
A
T
S3
– To Robert E. Treybal, page 700
Diketahui : X
3
= 0,0027 kg moisturekg dry solid spesifikasi produk 0,3 moisture dalam KH
2
PO
4
T
S3
= 180 °C Sehingga, H
S3
= 55,322 kJkg dry solid
f. Moisture balance Ss X
1
-X
2
= Gs Y
2
-Y
1
Robert E. Treybal, page 700 Diketahui : Ss = 4.789,246 kgjam
Ss X
1
-X
2
= Gs Y
2
-Y
1
1.692,041 = Gs Y
2
– 0,102 1.692,041 + 0,102 Gs
– Gs Y
2
= 0. . . 1
g. Entalpy balance Ss Hs
1
+ Gs H
G1
= Ss H
S2
+ Ss H
S3
+ Gs H
G2
Robert E. Treybal, page 700 4.789,246 x 44,705 + Gs. 579,509 = 4.789,246 x 138,305 + 4.789,246
x 55,322 + Gs60,3 + 2615,340 Y
2
214.103,242 + 579,509 Gs = 662.376,668 + 264.950,667 +60,3Gs+2615,340 GsY
2
214.103,242 + 579,509 Gs = 927.327,335 + 60,3Gs + 2615,340 GsY
2
713.224,093 – 519,209 Gs + 2.615,340 GsY
2
= 0 . . . 2
Eliminasi persamaan 1 dan 2 Didapat Gs = 20.354,956 kgjam
Sehingga, Y
2
= 1094,685 + 0,191 20.354,956 = 20.354,956.Y
2
Y
2
= 0,185 kg H
2
Okg air Jadi, H
G2
= 60,3 + 2615,340 Y
2
H
G2
= 544,138 kJkg
∆H umpan masuk,
∆H
9
= m . H
S1
= 4.789,246 kgjam . 44,705 kJkg dry solid = 214.103,242 kJjam
∆H udara masuk, ∆H
11
= m . H
G1
= 20.354,956 kgjam . 579,509 kJkg = 11.795.880,200 kJjam
∆H udara ke CS-301, ∆H
13
= m . H
G2
= 20.354,956 kgjam. 544,138 kJkg = 11.075.905,050 kJjam
∆H umpan ke CS-301,
∆H
12
= m . H
S3
= 4.789,246 kgjam . 55,322 kJkg dry solid = 271.701,724 kJjam
∆H umpan ke SC-301,
∆H
14
= m . H
S2
= 4.789,246 kgjam . 138,305 kJkg dry solid = 662.376,668 kJjam
Tabel F.2. Neraca Energi Spray Dryer – 301 SD-301
Aliran Masuk
kJjam Keluar
kJjam
∆H
9
214.103,242 ∆H
11
11.795.880,200 ∆H
13
11.075.905,050 ∆H
12
271.701,724 ∆H
14
662.376,668
Total 12.009.983,442
12.009.983,442