14 0 481 KB
NERACA MASSA A. STASIUN GILINGAN Data analisa stasiun gilingan (13 Agustus 2015) Tebu digiling
= 34030 ku
Nira mentah
= 32832 ku
Imbibisi
= 10250 ku Tabel . Data Analisis Stasiun Gilingan Uraian % brix % pol HK N1
15,91
11,96
75
N2
6,92
4,89
70,6
N3
4,97
3,4
68,3
N4
3,25
2,1
66,1
N5
2,17
1,39
64,1
NM
11,3
8,32
74,1
-
2,73
-
Ampas Perhitungan: N3
N4
N5
I
Tebu
Ampas N3+ Nt2 = N2 NM
N4 + Nt3 = N3
N5 + Nt4 = N4
N5
1) Menghitung N1 NM bnm
N2 bn2
N1 bn1 N1 = =
π.ππ βπ.π2 π .π1βπ.π2 11,3β6,92 15,91β6,92
x NM x 32.832 ku
= 15.996,01 ku P n1= =
π.π1 100
x N1
11,96 100
x 15.996,01 ku
= 1.913,123 ku B n1= =
π.π1 100
x N1
15,91 100
x 15.996,01 ku
= 2.544,966 ku
2) Menghitung N3 N2 bn2
N3 bn3 N3 =
Nt2 bn1 π.π1βπ.π2 π.π1βπ.π3
x N2
N2 = NM β N1 = 32.832 ku - 15.996,01 ku = 16.835,99 ku P n2=
π.π2
=
4,89
100
100
x N2 x 16.835,99 ku
= 823,2797 ku B n2=
π.π2
=
6,92
100
100
x N2 x 16.835,99 ku
= 1.165,05 ku
=
15,91β6,92 15,91β4,97
x 16.835,99 ku
= 13.835,06 ku P n3= =
π.π3 100 3,4 100
x N3 x 16.835,99 ku
= 470,3919 ku B n3=
π.π3
=
4,97
100
100
x N3 x 16.835,99 ku
= 687,6023 ku
3) Menghitung N4 N3 bn3
Nt3 bn1
N4 bn4
N4 =
π.π1βπ.π3
=
15,91β4,97
π.π1βπ.π4
15,91β3,25
x N3 x 13.835,06 ku
= 11.955,41 ku P n4= =
π.π4 100 2,1 100
x N4 x 11.955,41 ku
= 251,0637 ku
B n4=
π.π4
=
3,25
100
100
x N4 x 11.955,41 ku
= 388,5509 ku
4) Menghitung N5 N4 bn4
Nt4 bn1
N5 bn5 N5 =
π.π1βπ.π4
=
15,91β3,25
π.π1βπ.π5
15,91β2,17
x N4 x 11.955,41 ku
= 11.015,69 ku P n5=
π.π5
=
1,39
100
100
x N5 x 11.015,69 ku
= 251,0637 ku B n5=
π.π5
=
2,17
100
100
x N5 x 11.015,69 ku
= 239,0404 ku
5) Menghitung Ampas (Bagasse) Neraca massa overall: In β out = akumulasi
,akumulasi= 0
In = out Tebu + Imbibisi
= Nira Mentah Kotor + Ampas = NMK β Fnmk = NMK β (fnmk x NMK)
NM fnmk
= 2%
NM
= NMK β 0,02 NMK = 0,98 NMK
NMK
= 1,0204 NM = 1,0204 x 32.832 ku
NMK
= 33.502,04 ku
Maka, Ampas
= Tebu + Imbibisi β Nira Mentah Kotor = 34.030 + 10.250 β 33.502,04 = 10.778,23 ku
Pa5
π.π
= 100 x Ampas =
2,73 100
x 10.778,23 ku
= 294,2457 ku
B. STASIUN PEMURNIAN Nira Mentah Kotor
I
Nira Tapis
Nira Sulfitir II
Nira Encer
Nira Kotor
Air Pencuci
III
Blotong
Keterangan: I : Sulfitir II : Door Clarifier III : Rotary Vacuum Filter Perhitungan: Ampas = 10.778,23 ku Pa
π.π
2,73 100
= =
π.ππ 100 8,32 100
= 64,1 x 100 = 4,23
x 10.778,23 ku
= 294,2457 ku
Ba
x NM
π.π
= 100 x A =
4,23 100
x 10.778,23 ku
= 455,919 ku
x 32.832 ku
= 2.731,6224 ku
π.π
= π»πΎ π5 x 100 2,73
= 100 x Ampas =
Pnm
ba
Bnm
=
11,3 100
x 32.832 ku
Pt
= Pnm + Pa
= 3.710,016 ku
= 2.731,6224 ku + 294,2457 ku
Bt
= 3.025,8681 ku
= Bnm + Ba = 3.710,016 + 455,919 = 4.165,935 ku
Zktl tebu Ft
= Ft + Fnmk ππ
= Fa = 100 x A =
49,5 β 4,23 100
, fa = zka β ba
x 10.778,23 ku
= 4.879,304 ku Fnmk = ππππ x NMK 100 = 2% x 33.502,04 ku = 670,04 ku Maka, Zktl tebu
= 4.879,304 ku + 670,04 ku = 5.549,34 ku
Zk
= Bt + Zktl tebu = 4.165,935 ku + 5.549,34 ku = 9.715,28 ku
1. Neraca Massa di Rotary Vacuum Filter Nira Tapis
Nira Kotor
Air Pencuci
III
Blotong input β output
= akumulasi
input
= output
, akumulasi = 0
Nira Kotor + Air Pencuci
= Nira Tapis + Blotong
Nira tapis
= Nira Kotor + Air Pencuci β Blotong
Nira Kotor
= 15% x Tebu digiling
Air pencuci
= 2,5% x Tebu digiling
Blotong
= 4% x Tebu digiling
Maka, Nira tapis
= =
15+2,5β4 100 13,5 100
x 34.030 ku
x 34.030 ku
= 4.594,05 ku 2. Neraca massa di Sulfitir Nira Mentah Kotor
I
Nira Sulfitir
Nira Tapis
Kadar Maksimal
input β output
= akumulasi
input
= output
, akumulasi = 0
Nira mentah Kotor + Nira Tapis
= Nira sulfitir
Nira sulfitir
= 33.502,04 + 4594,05 = 38.096,1 ku
3. Neraca Massa di Door Clarifier
Nira Sulfitir Nira Kotor
II
Nira Encer input β output
= akumulasi
input
= output
Nira sulfitir
= Nira encer + Nira kotor
Nira Encer
= Nira sulfitir - Nira kotor
, akumulasi = 0
= 38.096,1 β 5.104,5 Nira encer
= 32.991,6 ku
C. STASIUN PENGUAPAN
Uap Bekas Air Jatuhan Nira Encer
Nira Kental Gambar. Diagram alir proses penguapan
Data analisa stasiun pemurnian: Nira encer Brix nira encer
= 32.991,6 ku = 13,82
Brix nira kental = 61,67
Nira Encer
STASIUN PENGUAPAN
Nira Kental
Air Gambar . Perhitungan: 1) Menghitung nira kental Neraca massa komponen gula: Akumulasi = input β output input = out bnira encer x NE = bnira kental x NK
, akumulasi = 0
NK = =
π.πππππππππ π₯ ππΈ π .ππππππππ‘ππ 13,82 π₯ 32.991,6 61,67
= 7.393,2854 ku 2) Menghitung total air yang diuapkan Neraca massa overall stasiun penguapan: Akumulasi = input β output
, akumulasi = 0
input = out Nira encer = Nira Kental + Air Air yang diuapkan = Nira encer β Nira Kental = 32.991,6 ku - 7.393,2854 ku = 25.598,31 ku 3) Menghitung air yang diuapkan di masing-masing badan evaporator Luas pemanasan badan penguap yang beroperasi: (13 Agustus 2015) Badan I
= 1500 m2
Badan II
= 1500 m2
Badan III
= 1100 m2
Badan IV
= 1100 m2
Total
= 5200 m2
a. Badan I πΏπ’ππ ππ£ππ πΌ
Air yang diuapkan = πΏπ’ππ πππ πππ’ππ’ 1500
πππ
x Total air yang diuapkan
= 5200 x 25.598,31 ku
= 7.384,129 ku Nira keluar badan I = nira encer β air diuapkan di badan I = 32.991,6 ku - 7.384,129 ku = 25.607,47 ku b. Badan II πΏπ’ππ ππ£ππ πΌπΌ
Air yang diuapkan = πΏπ’ππ πππ πππ’ππ’ πππ x Total air yang diuapkan 1500
= 5200 x 25.598,31 ku = 7.384,129 ku Nira keluar badan II = Nira keluar badan I β air diuapkan di badan II = 25.607,47 ku - 7.384,129 ku = 18.223,34 ku c. Badan III πΏπ’ππ ππ£ππ πΌπΌπΌ
Air yang diuapkan = πΏπ’ππ πππ πππ’ππ’ πππ x Total air yang diuapkan 1100
= 5200 x 25.598,31 ku = 5.415,028 ku Nira keluar badan III = Nira keluar badan II β air diuapkan di badan III = 18.223,34 ku β 5.415,028 ku = 12.808,31 ku d. Badan IV πΏπ’ππ ππ£ππ πΌπ
Air yang diuapkan = πΏπ’ππ πππ πππ’ππ’ πππ x Total air yang diuapkan 1100
= 5200 x 25.598,31 ku = 5.415,028 ku
Nira keluar badan IV = Nira keluar badan III β air diuapkan di badan IV = 12.808,31 ku - 5.415,028 ku = 7.393,285 ku Nira kental
= 7.393,285 ku
D. STASIUN MASAKAN DAN PEMUTARAN
Nira Kental
A
Putaran A1
Gula A
Stroop A
Putaran SHS
Gula SHS
Klare SHS
Masakan A Gula C Nira Kental
C
Putaran C
Masakan C
D
Putaran D1
Gula D1
Stroop C
Putaran D2 Klare D
Masakan D Tetes Neraca massa: ο· Masakan A β Gula A + Stroop A Gula A
β SHS + Klare SHS
ο· Masakan C β Gula C + Stroop C ο· Masakan D β Gula D1 + tetes Gula D1 β Gula D2 + Klare D ο· Overall: Nira kental β SHS + tetes
Gula D2
Tabel . Data analisis stasiun masakan (13 Agustus 2015) Uraian Nira Kental Masakan A Stroop A Gula A SHS Klare SHS Masakan C Stroop C Gula C Masakan D Tetes (Molasse) Gula D1 Gula D2 Klare D
% brix 61,67 93,7 83,6 99,2 99,9 74,1 96,9 86 97,3 99,4 93,49 96 96,6 84,6
Perhitungan: 1) Neraca massa overall: Nira kental β SHS + Tetes BNK HKnk
BT HKT
BSHS HKSHS
Nira kental = 7.393,285 ku BNK
= bnk x Nira kental =
61,67 100
x 7.393,285 ku
= 4.559,439 ku BSHS
π»πΎ .ππ βπ»πΎ .π
= π»πΎ .ππ»π β π»πΎ .π x BNK
% pol 46,21 74,9 49,7 98,3 99,7 66,5 67,5 42 91,4 58,9 31,23 86 89 45,9
HK 74,9 80 59,4 99,1 99,8 89,7 69,6 48,9 93,9 59,2 33,4 89,5 92,2 54,2
74,9 β33,4
= 99,8β 33,4 x 4.559,439 ku = 2.849,649 ku BTetes
= BNK β BSHS = 4.559,439 ku - 2.849,649 ku = 1.709,79 ku
2) Masakan D a. Masakan D β Gula D1 + Tetes BmasakanD HKmasakanD
B gl D1 HK gl D1 BmasakanD
BT HKT π»πΎ .π·1βπ»πΎ .π
= π»πΎ .π·1β π»πΎ .πππ ππππ
π·
x BT
74 ,9β33,4
= 74,9β 59,2 x 1.709,79 ku = 3.165,65 ku = Bmasakan D β Btetes
B gl D1
= 3.165,65 β 1.709,79 ku = 1.455,861 ku b. Gula D1 β Gula D2 + Klare D Bgl.D1 HKgl.D1
Bgl.D2 HKgl.D2
BklareD HKklareD
Bgl.D2
π»πΎ .π·1βπ»πΎ .ππππππ·
= π»πΎ .π·2β π»πΎ .ππππππ· x Bgl.D1 89,5β54,2
= 92,2β 54,2 x 1.455,861 ku = 1.352,418 ku BklareD
= Bgl.D1 β Bgl.D2 = 1.455,861β 1.352,418 = 103,4427 ku
3) Masakan A a. Gula A β SHS + Klare SHS Bgula.A HKgula.A
Bklare.SHS HKklare.SHS Bgula.A
BSHS HKSHS π»πΎ .πππππ .ππ»π βπ»πΎ .ππ»π
= π»πΎ .πππππ .ππ»π β π»πΎ .ππ’ππ .π΄ x BSHS 89,7β99,8
= 89,7β 99,1 x 2.849,649 ku = 3.061,857 ku Bklare.SHS
= Bgula.A β BSHS = 3.061,857 β 2.849,649 ku = 212,208 ku
b. Masakan A β Gula A + Stroop A Bmasakan.A HKmasakan.A
Bstroop.A HKstroop.A
Bgula.A HKgula.A
Bmasakan.A
π»πΎ .π π‘ππππ .π΄βπ»πΎ .ππ’πππ΄
= π»πΎ ..π π‘ππππ .π΄β π»πΎ .πππ ππππ =
59,4β99,1 59,4β 80
.π΄
x 3.061,857 ku
= 5900,764 ku BStroop.A
= Bmasakan.A β Bgula.A = 5900,764 β 3.061,857 ku = 2.838,907 ku
4) Masakan C Masakan C β Gula C + Stroop C Bmasakan.C HKmasakan.C
Bgl.C HKgl.C
BStroop.C HKStroop.C
Data analisa masakan C: VMasakan C
= 1.050 HL
BJMasakan C
= 1,3
Masakan C
= V x BJ = 1.050 x 1,3 = 1.365 ku
Bmasakan C
= =
π.πππ πππππΆ 100 96,9 100
x Masakan C
x 1.365 ku
= 1.322,685 ku
x Bgula.A
Bgl.C
=
π»πΎ .πππ ππππ .πΆβπ»πΎ .ππ‘ππππ .πΆ π»πΎ .ππ .πΆβ π»πΎ .ππ‘ππππ .πΆ 69,6β 48,92
x Bmasakan.C
= 93,9β 48,92 x 1.322,685 ku = 608,4351 ku BStroop.C = Bmasakan.C β Bgl.C = 1.322,685 β 608,4351 = 714,2499 ku