Perhitungan Data Aktual
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PERHITUNGAN DATA AKTUAL A. Neraca Panas yang Masuk ke Melter (Q 1 ) Neraca Panas Urea Diketahui : m in = 37500 kg/jam BM = 60 kg/kmol M in = 625 kmol/jam Cp = 94 kJ/kmol x 0,239 kkal/kJ = 22,466 kkal/mol K T in = 71,4 o C = 344,4 o K T ref = 25 o C = 298 o K Q urea = M in . Cp . ∆T = 625 kmol/jam x 22,466 kkal/mol K x (344,4-298) o K = 625 kmol/jam x 22,466 kkal/mol K x 46,4 o K = 651514 kkal/jam Neraca Panas Air Diketahui : m in = 112 kg/jam BM = 18 kg/mol M in = 6,222 kmol/jam Cp = 8,22 + 0,00015T + 0,00000134T 2 T in = 71,4 o C = 344,4 o K T ref = 25 o C = 298 o K
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Transcript of Perhitungan Data Aktual
PERHITUNGAN DATA AKTUAL
A. Neraca Panas yang Masuk ke Melter (Q1)
Neraca Panas Urea
Diketahui :
min = 37500 kg/jam
BM = 60 kg/kmol
Min = 625 kmol/jam
Cp = 94 kJ/kmol x 0,239 kkal/kJ = 22,466 kkal/mol K
Tin = 71,4oC = 344,4 oK
Tref = 25 oC = 298 oK
Q urea = Min . Cp . ∆T
= 625 kmol/jam x 22,466 kkal/mol K x (344,4-298) oK
= 625 kmol/jam x 22,466 kkal/mol K x 46,4 oK
= 651514 kkal/jam
Neraca Panas Air
Diketahui :
min = 112 kg/jam
BM = 18 kg/mol
Min = 6,222 kmol/jam
Cp = 8,22 + 0,00015T + 0,00000134T2
Tin = 71,4 oC = 344,4 oK
Tref = 25 oC = 298 oK
Q air = Min .∫Tref
Tin
.Cp . ∆T
= 6,222 kmol/jam x ∫298
344,6
.¿¿ 8,22 + 0,00015T +
0,00000134T2) kkal/kmol K.dT
= 6,222 kmol/jam x (8,431 – 8,384) kkal/kmol
= 6,222 kmol/jam x 0,047 kkal/kmol
= 0,292 kkal/jam
Neraca Panas Biuret
Diketahui :
min = 103 kg/jam
BM = 103,08 kg/kmol
Min = 0,999 kmol/jam
Cp = 131,3 kJ/kmol x 0,239 kkal/kJ = 31,381 kkal/kmol
K
Tin = 71,4 oC = 344,4 oK
Tref = 25 oC = 298 oK
Q biuret = Min . Cp . ∆T
= 0,999 kmol/jam x 31,381kkal/kmol K (344,4-298) oK
= 0,999 kmol/jam x 31,381kkal/kmol K x 46,4 oK
= 1454,622 kkal/jam
Panas yang masuk ke melter adalah Q1
Q1 = Qurea + Qair + Qbiuret
= 651514 kkal/jam + 0,292 kkal/jam + 1454,622 kkal/jam
= 652968,914 kkal/jam
B. Nerca Panas yang Keluar dari Melter (Q2)
Neraca Panas Urea
Diketahui :
mout = 37500 kg/jam
BM = 60 kg/kmol
Mout = 625 kmol/jam
Cp = 94 kJ/kmol K x 0,239 kkal/kJ = 22,466 kkal/mol K
Tout = 137 oC = 410 oK
Tref = 25 oC = 298 oK
Q urea = Mout . Cp . ∆T
= 625 kmol/jam x 22,466 kkal/mol K (410-298) oK
= 625 kmol/jam x 22,466 kkal/mol K x 112 oK
= 1572620 kkal/jam
Neraca Panas Air
Diketahui :
mout = 112 kg/jam
BM = 18 kg/kmol
Mout = 6,222 kmol/jam
Cp = 8,22 + 0,00015T + 0,00000134T2
Tout = 137 oC = 410 oK
Tref = 25 oC = 298 oK
Q air = Min .∫Tref
Tout
.Cp . ∆T
= 6,222 kmol/jam x ∫298
410
.¿¿ 8,22 + 0,00015T +
0,00000134T2) kkal/kmol K.dT
= 6,222 kmol/jam x (8,507 – 8,384) kkal/kmol
= 6,222 kmol/jam x 0,123 kkal/kmol
= 0,765 kkal/jam
Neraca Panas Biuret
Diketahui :
mout = 103 kg/jam
BM = 103,08 kg/kmol
Mout = 0,999 kmol/jam
Cp = 131,3 kJ/kmol x 0,239 kkal/kJ = 31,381 kkal/kmol
K
Tout = 137 oC = 410 oK
Tref = 25 oC = 298 oK
Q biuret = Mout . Cp . ∆T
= 0,999 kmol/jam x 31,381 kkal/kmol K x (410 - 298) oK
= 0,999 kmol/jam x 31,381 kkal/kmol K x 112oK
= 3511,157 kkal/jam
Panas yang masuk ke melter adalah Q2
Q2 = Qurea + Qair + Qbiuret
= 1572620 kkal/jam + 0,765 kkal/jam + 3511,157 kkal/jam
= 1576131,922 kkal/jam
C. Steam yang Masuk ke Melter
min = 8,4 T/H x 1000 kg/T = 8400 kg/jam
BM = 18 kg/kmol
Min = 466,667 kmol/jam
Tin = 184 oC = 457 oK
Pin = 5,78 kg = 0,567 Mpa
Tekanan
(MPa)
Entalphy
(kJ/kmol)
0,1
0,567
1,0
49,189
?
50,030
Interpolasi untuk mencari entalphy dari steam bertekanan 0,567 Mpa
x− x1x2−x 1 = y− y1
y2− y1
x−49,18950,030−49,189 = 0,567−0,1
1,0−0,1
x−49,1890,841 = 0,467
0,9
0,9x – 44,270 = 0,374
0,9x = 44,644
X = 49,604 kJ/kmol
∆Hin = 49,604 kJ/kmol x 1000 mol/kmol = 11855,356 kJ/kmol
Q3 = Min x ∆H
= 466,667 kmol/jam x 11855,356 kJ/kmol
= 5532503 kkal/jam
D. Steam yang Keluar dari Melter (Q4)
Q4 = (Q1 + Q3) – Q2
= (652968,914 kkal/jam + 5532503 kkal/jam) - 1576131,922
kkal/jam
= 4609340,41 kkal/jam
Jadi, total panas yang masuk ke melter (Qin)
Qin = Q1 + Q3
= 652968,914 kkal/jam + 5532503 kkal/jam
= 6185472,332 kkal/jam
Dan total panas yang keluar dari melter (Qout)
Qout = Q2 + Q4
= 1576131,922 kkal/jam + 4609340,41 kkal/jam
= 6185472,332 kkal/jam
Menghitung Efisiensi
Efisiensi = NeracaPanas AktualNeraca Panas Design x 100 %
= 6185472,33232147003,51 x 100 %
= 19,2 %
