Hasanoglan Cement Fan Technology Training course Germany, 2009 KHD Humboldt Wedag GmbH Table of contents General i
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Hasanoglan Cement
Fan Technology Training course Germany, 2009
KHD Humboldt Wedag GmbH
Table of contents General information/introduction Design of fans Impeller design Comparison of different control systems Assembly / erection Commissioning Operation Executed fans Investigation of gas flow in a high pressure fan Wednesday, January 21, 2009
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KHD Humboldt Wedag GmbH
General information / introduction This paper is primarily meant as a practical introduction into the field of KHD-fans with the aim to facilitate handling and commissioning, maintenance and elimination of trouble during operation. KHD Humboldt Wedag GmbH mainly manufactures fans for the cement industry and can look back on a long tradition and experience and carry on this basis. Thanks to their robust construction the KHD fans are designed for especially rough operating conditions at a high degree of operational safety. For all materials used great importance is attached to good weldability and high toughness. The fields of application of the KHD fans primarily are the transport of hot gases and dusts. e.g. as: Raw meal fans with high dusts loads and high differential pressures Preheater fans, suitable for temperatures up to 450 °C with narrow blades for operation at low vibrations and at the same time low tendency to form accretions and high efficiency. Dedusting fans for kiln waste gas dedusting, cooler- and bypass dedusting for large volumetric flows at low pressures Fans for cement grinding with particularly abrasive wear
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KHD Humboldt Wedag GmbH
Wednesday, January 21, 2009
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KHD Humboldt Wedag GmbH
Design of fans The fans essentially consist of a centrifugal/radial ventilator wheel (blades backward curved) on a shaft carried in antifriction bearings and the housing designed as guiding attachment. The conveying rate can be controlled with the aid of inlet vane vane control/louvre damper and/or speed controller. However a further option are the losses through a throttle flap arranged upstream in the tube. This option is readily made use of for raw meal fans with constant operation. The impeller and shaft are dynamically balanced (ISO DIN 1940 G3,4). Our workshop can balance impellers up to a diameter of approx. 4.5 m and a maximum weight of 12 t. The shafts are manufactured up to tip widths of 7.8 m. The impellers are designed for a maximum circumferential speed of 185 m/s. The materials of the impellers can be used at operating temperatures up to 450 °C. Regarding the strength the shafts are designed with high safeties and are, according to customer requests, designed with the predetermined distances to the critical natural frequency, at least, however, with factor 1.4 (sub-critical operation). Mainly used are oil-lubricated self-aligning roller bearings. Deviating from this in some cases also grease-lubricated bearings. These bearings have a simple design and require no separate cooling (oil cooling, air cooling) and can be used at high temperatures. The bearings can easily be exchanged. Oil lubrication by means of an oil supply ring ensures a low-cost, trouble-free and low-maintenance operation. Due to simple antifriction bearings the fan can be operated with very low speeds which is not permitted for plain bearings on account of the hydrodynamical lubrication principle which could also result in increased wear. The antifriction bearings (self-aligning roller bearings) are designed for a service life of at least 100000 h.
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KHD Humboldt Wedag GmbH
As required, the arrangement is made rigid or flexible (by means of spring element). Whereas the fans in high buildings are mainly arranged flexibly (reduction of the dynamical forces to approx. 3 %), fans set up directly on the foundation can be rigidly anchored for the purpose of simplifying the technique and minimizing of the costs. The fans are distinguished according to the different pressure differences into low-pressure/medium pressure and high-pressure fans (up to 185 m/s circumferential speed). High-pressure fans with self-aligning roller bearings are exclusively designed with cylindrical seat (no tensioning sleeves). Depending on use, size and speed the fans are built single-inlet or double-inlet, for which the single-inlet low-pressure fans up to a diameter of 3.35 m are designed overhung; highpressure fans (with narrow wheels) are designed overhung up to a diameter of 3.15 m for a max. speed of 1000 1/min. Moreover, the fan shafts are supported on either side. Low capacities can be realized with the aid of belt drive for the purpose of simple speed variation. Because of easier handling/maintenance and for reasons of safety capacities >400 kW are only transmitted with low-maintenance couplings and/or spur gearings. Low-pressure/medium pressure fans are mainly used as dedusting fans and due to the high amount of air these are largely of twin-stream design with low speeds.
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KHD Humboldt Wedag GmbH
Advantage of single-inlet type: low cost, utilization of tumbling effect (Koriolis force) only one inlet Advantage of double-inlet type: high air capacity at low density, lower circumferential speed of the impeller than in case of an equivalent single-inlet impeller. Lower axial forces. Lower motor costs. The kiln- and cooler dedusting fans are of double-inlet type on account of the high amount of air. The classifier fan (cement grinding) is of single-inlet and overhung type due to the high wear which ensures that the fan shaft is not exposed to wear caused by the material. By ample dimensioning of the impeller , wear at the armoured impeller is low and has an long service life also in case of increased dust. Given below is a short survey of the fans presently taken into operation and those which will be taken into operation.
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KHD Humboldt Wedag GmbH design of fans/small summary of fans going actual in commissioning Y ear
C o unt ry
P l ant
F an t yp e
Int ake
V m³/ mi n
∆p [ mb ar]
T °C
Po w er at shaf t kW
S p eed rp m
S uct i o n ∅ - mm
I mp el l er ∅ - mm
2008
Jo rd anien
KC C Kat rana
HKSK2 12 / 3 15
sing le
75 4 4
6 8 51
3 10
114 1
9 70
2 12 0
3 150
2008
Jo rd anien
KC C Kat rana
HKSK2 12 / 3 15
sing le
75 4 4
6 8 51
3 10
114 1
9 70
2 12 0
3 150
2008
T ürkei
C i mp o r Y i b i t as
HKSK2 12 / 3 55
sing le
86 9 0
8 73 6
320
170 0
960
2 12 0
3 550
2008
Lyb ien
Li b yan C ement
E M B 8 9 0 / 12 6 0
sing le
860
16 8 0
50
29
8 70
997
12 6 0
2008
Lyb ien
Li b yan C ement
B 10 0 0 / 14 0 0
sing le
13 3 8
2668
240
74
12 0 0
12 10
14 10
2008
R ussland
N o vo t ro i z k
HKF 2 12 / 3 0 0
sing le
63 0 5
4 79 5
10 0
693
74 0
2 12 0
3000
HKF 19 0 / 2 9 0
sing le
52 4 8
4 10 7
90
497
73 0
19 0 0
2800
Z M B 16 0 0 / 2 2 4 0 sing le
64 6 7
1711
10 3
225
555
16 0 0
2240
2008
R ussland
N o vo t ro i z k
2008
R ussland
N o vo t ro i z k
2008
Lyb ien
Li b yan C ement
HKF 13 2 / 2 0 0
d o ub l e
22 1 6
3 6 77
12 5
16 7
980
13 70
19 8 0
2008
R ussland
N o vo t ro i z k
HKSK2 12 / 3 15
sing le
81 0 0
6 9 71
323
12 6 2
995
2 12 0
3 150
2008
Lyb ien
Li b yan C ement
M KF 2 12 / 3 15
sing le
68 0 4
4288
240
59 8
73 5
2 12 0
3 150
2008
Lyb ien
Li b yan C ement
HKF 16 0 / 2 8 5
sing le
41 7 0
716 0
3 50
662
10 4 0
16 0 0
2 8 50
2008
Ä g yp t en
PE R T E C H
HKD 19 0 / 3 55
d o ub l e
1 2 6 75
8804
3 10
2462
890
2 18 8
3 550
2008
Sud an
M ass Gl o b al
HKD 2 0 0 / 3 3 5
sing le
1 4 0 00
78 9 8
320
2490
920
2428
3 3 50
2008
Sud an
M ass Gl o b al
HKSK19 0 / 2 75
d o ub l e
56 0 0
79 6 7
90
10 14
990
2200
2 750
2008
T ürkei
D eni z li C i ment o SA N T . A .S
HKF 19 0 / 2 8 0
sing le
54 5 2
56 0 9
90
627
845
19 0 0
2800
2008
R ussland
N o vo t ro i z k
B2 000 / 2 80 0
d o ub l e
46 6 8
16 4 0
3 50
16 1
54 0
2000
2800
2008
Sud an
A sec
HKF 18 0 / 2 2 4
sing le
44 8 0
4096
90
385
9 75
18 0 0
2240
2008
Sud an
A sec
HKF 18 0 / 2 2 4
sing le
44 8 0
4096
90
385
9 75
18 0 0
2240
2007
B o sni en
Lukavac
HKS K18 0 / 3 0 0
sing le
58 3 0
774 5
3 10
10 0 2
10 0 5
18 0 0
3000
2007
C hi na
Ji ang xi Y a D o ng
HKS 19 0 / 3 0 0
sing le
60 6 7
713 7
345
968
995
19 0 0
3000
2007
C hi na
Ji ang xi Y a D o ng
HKS 19 0 / 3 0 0
sing le
60 6 7
713 7
345
968
995
19 0 0
3000
2007
T ürkei
B al ikesi r
HKS K16 0 / 3 2 5
sing le
42 0 5
8841
365
820
9 75
179 3
3 2 50
2007
Lyb ien
A C C So uk el Khami s
HKF 18 0 / 2 2 4
sing le
39 1 7
3045
3 50
263
10 0 0
18 0 0
2260
2007
Lyb ien
A C C So uk el Khami s
HKF 18 0 / 2 2 4
sing le
39 1 7
3045
3 50
263
10 0 0
18 0 0
2260
2007
T ürkei Kahr amanmar as C i ment o ve M ad enci l i k I sl et meler i HKS A . S.K2 3 6 / 3 55
sing le
98 8 6
73 3 8
300
16 0 0
8 75
2900
3 550
sing le
76 3 3
4 111
18 0
649
750
2 12 0
3 150
2007
R umäni en
HOLC I M
M KF 2 12 / 3 15
2007
R umäni en
HOLC I M
M KD 2 0 0 / 3 0 0
sing le
1 1 3 56
3 8 10
220
886
72 0
2000
3000
2007
Kro at i en
Ko r o macno
HKF 14 0 / 2 3 6
sing le
29 5 4
4 3 75
300
2 74
990
14 0 0
2380
1 2 5 56
8393
290
2333
935
2 12 0
3 3 50
1 1 0 00
2328
10 5
54 7
54 5
2240
2800
16 5 0
3866
90
14 2
13 17
10 0 0
14 0 0
2007
R umäni en
HOLC I M
HKD 19 0 / 3 3 5
d o ub l e
2006
I ran
Z aveh T o r b at
ZM B20 00 / 2 80 0
d o ub l e
2006
R ussl and
M o rd o w
B 10 0 0 / 14 0 0
sing le
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KHD Humboldt Wedag GmbH Design of fans Preheater fan Hasanoglan HKSK212/355
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KHD Humboldt Wedag GmbH
Data of performance Preheater-fan: volume flow V: 8690 m³/min pressure difference ∆pst: 84 mbar pressure difference ∆pt: 87,36 mbar temperature °C: 320°C speed: 960 1/min power consumption Pw: 1700 kW motor power: 1785 kW at 330 up to 960 1/min content of dust: 25 g/m³ density at entree: 0,519 kg/m³ drive: control system: installation: bearing: vibration control: temperature monitoring:
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coupling frequency control spring units on both sides, pendular roller bearing both sides PT100 (both sides)
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KHD Humboldt Wedag GmbH
Cooler dedusting fan Zaveh Torbat ZMB1800/2500
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KHD Humboldt Wedag GmbH
Datas of performance cooler dedusting-fan: volume flow V: 9155 m³/min pressure difference ∆pst: 20 mbar pressure difference ∆pt: 22,53 mbar temperature °C: 240 °C speed: 695 1/min power consumption Pw: 437 kW motor power: 450 kW at 330 up to 730 1/min content of dust: 0,05 g/m³ density at entree: 0,563 kg/m³
drive: control: installation: bearing: vibration control: temperature monitoring:
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coupling frequency control rigidly anchored both sides, pendular roller bearing both sides PT100 (both sides)
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KHD Humboldt Wedag GmbH
Main EP fan Zaveh Torbat ZMB2000/2800
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KHD Humboldt Wedag GmbH
Datas of performance Main EP-fan: volume flow V: pressure difference ∆pst: pressure difference ∆pt: temperature °C: speed n: power consumption Pw: motor power: content of dust: density at entree:
11000 m³/min 20 mbar 23,28 mbar 105 °C 545 1/min 547 kW 580 kW at 300 up to 1000 1/min 0,05 g/m³ 0,769 kg/m³
coupling, gear drive frequency control rigidly anchored on both sides, pendular roller bearing both sides PT100 (both sides)
drive: speed control: installation: bearing: vibration control: temperature monitoring:
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KHD Humboldt Wedag GmbH
Separator fan Zaveh Torbat HKF170/236
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KHD Humboldt Wedag GmbH
Capacity of Separator-fan: Volume flow V: pressure difference ∆pst: pressure difference ∆pt: temperature °C: speed: power consumption Pw: motor power: content of dust: density at entree:
drive: Control system: fan installation: mounting:
vibration control temperature monitoring: wear protection:
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3600 m³/min 41 mbar 41,67 mbar 90°C 970 1/min 349 kW 375 kW at 970 1/min 50 g/m³ 0,769 kg/m³ coupling inlet vane control spring units single inlet (overhung) bearing, pendular roller bearing fix bearing PT100 (2x) housing, armoured impeller
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KHD Humboldt Wedag GmbH
Design of fans / materials / shafts •Solid shafts Preheater-/ Mill fans Single –stream type
S355J2G3, P355NH, 13CrMo4-5 forged
Hollow shaft/welded construktion preheater-/ S355J2G3, P355NH, 16Mo3 Mill-/waste gas fans shaft journal forged Twin stream type tubes seamless hot rolled (EN10210) All forged solid shafts and hollow shaft/tubes, journals with inspection certificate 3.1b EN10204 and ultrasonic testing EN10246. Hollow shafts are balanced separately according to DIN 1940 G6,3.
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KHD Humboldt Wedag GmbH
Design of fans/materials/impeller Preheater fans :
13 Cr Mo 44 high-temperature steel yield points at 20 °C - 275 N/mm² at 350 °C - 216 N/mm² at 450 °C - 196 n/mm² at 500 °C - 177 N/mm²
P355NH (WStE 355) hot ductile fine- grained construction steel yield pointsat 20 °C - 304 N/mm² at 350 °C - 196 N/mm² at 400 °C - 167 N/mm² The two materials have a very high toughness and therefore are to a high degree insensitive to cracks and have a good weldability.
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KHD Humboldt Wedag GmbH
Mill air circulation fans, for Raw meal mills (tube mills) :
impeller bottom and –cover plate – fine-grained constructional steel blades – highly wear-resistant material Dillidur 325L, Brinar400Cr, Creusabro8000
Vertical raw meal mills :
impeller bottom and –cover plate fine-grained constructional steel blades – armoured (depending on circumferential speed and material properties)
Cement grinding :
impeller and cover plate made of fine-grained constructional steel blades and bottom armoured (in blade zone)
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KHD Humboldt Wedag GmbH
Impeller design
KHD-impellers are preferably manufactured for high differential pressures in narrow design (large ratio of impeller outer diameter relative to the blade width). This causes steady running properties, thus ensuring smooth running (minor oscillations and self stabilization due to Koriolis-effect respectively) and insensitivity especially for hot gases against dust accumulations/-accretions. KHD-impellers are manufactured with rotating inlet nozzle due to which enlarged gaps as a result of manufacturing inaccuracies cause less losses of efficiency. The range of the diameter ratio D2/D1 reaches from 0.35 – 0.71. Preheater/high-pressure fans are designed with a diameter ratio from 0.35 to 0.63. Large volumetric flows at low pressures (e.g. waste gas fans) are designed with a diameter ratio of 0.71. Blade outlet angle ß2=47°- 75° For small outlet angles the tendency to form accretions increases especially for preheater fans. The Hasanoglan preheater fan has an outlet angle of 50°. This reduces the tendency to form accretions. For waste gas fans with high air capacities at simultaneously low pressure differential preferably small outlet angles are used on account of the high efficiencies. The blade inlet angle is mainly ß1 = 35°.
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KHD Humboldt Wedag GmbH Blade shape: airfoil advantages: efficiency 0.84-0.86 minor accretions on the front Drawbacks: major manufacturing expenditure high tendency to form accretions on the rearmajor drop of efficiency (to 0.72-0.75) in case of accretions flow guide plate thin, therefore wear-through danger ensuing dust accumulations in the blade causing unbalance which is hard to eliminate Blade shape: backward curved ß1=ß2=40…45°logarithmically bent blades Advantages: efficiency 0.80-0.84 drawbacks: high manufacturing expenditure high tendency to form accretions on the rear due to small outletangle ß1=ß2 – circular blades (at Humboldt ß1=35°and ß2=50-63°) Advantages: efficiency 0.78-0.82 low manufacturing expenditure minor tendency to form accretions on the rear Blade shape: radial tip ß2=90°- circular blades Advantages: no accretions on the rear low manufacturing expenditure Drawbacks: efficiency 0.65-0.75 High tendency to form accretions at the front Blade shape: radial Advantages: no accretions on the rear negligible manufacturing expenditure Drawbacks: efficiency 0.6-0.65 high tendency to form accretions at the front
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KHD Humboldt Wedag GmbH
Impeller before assembling with shaft
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KHD Humboldt Wedag GmbH
Main /cooler waste gas impeller with shaft
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KHD Humboldt Wedag GmbH
Double inlet preheater fan impeller
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KHD Humboldt Wedag GmbH
Separator impeller with armoured blades
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Single inlet fan impeller with reinforced blades preheater fan
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KHD Humboldt Wedag GmbH
Impeller during balancing
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KHD Humboldt Wedag GmbH Fabrication of hollow shaft
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KHD Humboldt Wedag GmbH
Comparison of different control systems
Preheater fans are principally equipped with speed control Mill fans are principally eyquipped with throttle flap, inlet vane control or louvre damper Classifier fans: inlet vane control or speed control Inlet vane control: +simple control insensitive to trouble +for small control range low cost of power -high losses for large control ranges 1500 1/min) should be operated with slightly opened guide vane controller in the starting phase in order to avoid oscillations.
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KHD Humboldt Wedag GmbH
Increased oscillations: Possible causes: Unbalance due to transport damage, distortion caused by overheating, accretions, strong wear Defective, not free, expansion joints Loose or distorted machine parts (not adequately assembled) Damage in impeller (for example crack in reinforcing cone) Generally transport damage is obvious at the cover plate or at the bottom plate (caused by hard placing during reloading) and should be remedied by dynamical balancing according to DIN ISO 1940 Q6,3. Here, special attention should be focussed on the axial oscillations as this may cause cracks in the reinforcing cone of the impeller and damage to the bearing. This also applies to distorted impellers as a result of overheating especially regarding preheater fans. Worn-down impellers should be repaired in part and afterwards dynamically balanced (by KHD specialists). Accretions and accumulations especially occur at mill fans and preheater fans on the blade rear. For mill fans the effects of accretions can be kept low or without decisive influence as described below. blades with outlet angle >= 47° use of narrow blades contrary to clean gas impellers Wednesday, January 21, 2009
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KHD Humboldt Wedag GmbH Accretions in preheater fans Partial coming-off of the accretions, when reaching a critical accretion compound major unbalance is created at the impeller, which occur as major horizontal oscillations. Factors which influence the tendency to form accretions : Velocity of the dust particles inside the impeller-inlet nozzle. This velocity in inlet should be kept below 40 m/s. Tests of several well-known fan manufacturers revealed that from 40 m/s the tendency to form accretions strongly increases. Temperature of the medium to be conveyed From 300 °C temperature of medium to be conveyed sligh t accretions are to be expected, for which the physical-chemical properties of the dust particles influence this temperature limit. Above 350 °C operating temperature the tendency to fo rm accretions becomes stronger and should be minimized with the aid of narrow blades and large blade outlet angles. Speed of fan The speed of the preheater fans should not exceed 1000 1/min and the circumferential speed of the impeller should range below 185 m/s. Blade shape The blade shape influences localization of accretions at the impeller (see under Enclosure). The blades should be preferably narrow and provided with outlet angles >47°. (At Hasanoglan 50°have been realized at the preheater fan Physical-chemical properties of the dust particles Dust with higher clay component causes hard, layer-type accretions on the blade rear sides. Accretions can passively be reduced by means of an acoustic horn.
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KHD Humboldt Wedag GmbH
Increased wear: Raw meal is less abrasive than cement dust, however as from a dust portion of 60 g/m² especially for roller press grinding the impeller should be armoured. If no high differential pressures (as for vertical mills) are requested, the gas velocity in the impeller inlet should be kept below 34 m/s. Wear is yet increased due to especially coarse grain size of the dusts contained in the air to be transported.
Expansion joints: The expansion joints should have been fitted freely movable and should be free from material/accretions. No load from the weight from the tube must be introduced. Increased oscillation through solid expansion joints (stops) are obvious from the flattening of the upper sinus oscillation in the oscillograph.
Loose defective parts: Increased oscillations can occur loose or by incorrect placing of the bearing housings on the bearing plates. This missing stiffness is manifested by strong vertical oscillations (larger than horizontal) which have maximum amplitude for the operating frequency.
Damage inside impeller: Increased oscillations can be caused by damage already occurred inside the impeller. This damage can be cracks or heavily worn-down zones. Therefore, it is absolutely required that the permissible limit values are not exceeded and the machine is stopped or inspected. During operation it should always be made sure that the axial oscillations are lower than the radial oscillations, as these cause cross-oscillations in the impeller bottom.
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KHD Humboldt Wedag GmbH
Executed fans 1: On the basis of the enclosed annexes the capacity spectrum for KHD fans shall be presented. Example: Yanbu capacity increase to 9500 t/day (conversion on existing fan foundation) Capacity data electrostatic precipitator fan: Volume flow V: 23500 m³/min= 1,4 Mio m³/h pressure difference ∆pst: 23 mbar pressure difference ∆pt: 23,59 mbar Temperature : 90°C speed n: 425 1/min power consumption Pw: 1430 kW Motor power: 1600 kW bei 1200 1/min content of dust : 1,00 g/m³ density at entree : 0,948 kg/m³ Diam of impeller : 3750mm Length of shaft : 7800mm Weigth of impeller with shaft : 10700kg Gear transmission ratio: i=2,8
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KHD Humboldt Wedag GmbH
Yanbu capacity increase to 9500 t/day Saudi Arabia (Yanbu9500)
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KHD Humboldt Wedag GmbH
Yanbu9500
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KHD Humboldt Wedag GmbH
Yanbu 9500
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KHD Humboldt Wedag GmbH
Yanbu9500
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KHD Humboldt Wedag GmbH
Impeller with shaft Yanbu 9500
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KHD Humboldt Wedag GmbH
Investigation of impeller with shaft Yanbu 9500 by FEM
Centrifugal force
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Centrifugal force radial displacement Wednesday, January 21, 2009
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KHD Humboldt Wedag GmbH
Centrifugal force comparison stress Wednesday, January 21, 2009
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KHD Humboldt Wedag GmbH
First natural frequency f=4.71 Hz torsional mode of vibration tangential displacement
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KHD Humboldt Wedag GmbH
2./3. natural frequency f=13,36Hz bending mode of vibration
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KHD Humboldt Wedag GmbH
4./5.natural frequency f=16,24Hz transition mode of vibration
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KHD Humboldt Wedag GmbH
Executed fans 2: Capacity increase of cementplant in turkey from of 1500t/day to 2500t/day: By increasing of upper cyclonecover By increasing of the waste gas duct/down comer By new preheater fan Performance data of new preheater-fan: volume flow V: 7050 m³/min pressure differenz ∆pst: 95 mbar pressure differenz ∆pt: 97 mbar temperature : 330°C speed : 1030 1/min power consumption Pw: 1530 kW motor power: 1610 kW content of dust: 25 g/m³ density at entree: 0,511 kg/m³
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KHD Humboldt Wedag GmbH
Elazig preheater fan with insulation
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KHD Humboldt Wedag GmbH
Executed fans 3: Double inlet preheater fan Thung Song 6 Performance datas of Preheater-fan Typ HKD170/300: volume flow V: 9800 m³/min pressure difference ∆pst: 75 mbar pressure difference ∆pt: 79 mbar temperature : 290°C speed : 1000 1/min power consumptionPw: 1674 kW motor power: 1700 kW content of dust: 25 g/m³ density at entree: 0,63 kg/m³
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KHD Humboldt Wedag GmbH
Preheater fan Thung Song 6
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KHD Humboldt Wedag GmbH
Most powerful vertikal mill fan Double inlet mill fan Thung Song 5 Performance data of mill-fan: volume folw V: 18000 m³/min pressure differenz ∆pst: 118 mbar pressure differenz ∆pt: 124 mbar temperature : 90°C speed: 1000 1/min power consumption Pw: 4886 kW motor power: 5000 kW content of dust: 30 g/m³ density at entree: 0,86 kg/m³
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KHD Humboldt Wedag GmbH
Most powerful single inlet preheater fan Singel inlet preheater fan Kanthan/Malaysia Performance datas of preheater fan Typ HKS224/355: volume flow V: 9500 m³/min pressure differenz ∆pst: 93 mbar temperature : 370°C speed: 1000 1/min power consumption Pw: 2030 kW motor power: 2300 kW content of dust: 25 g/m³ density at inlet: 0,55 kg/m³
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KHD Humboldt Wedag GmbH
Investigation of gas flow in a high pressure fan At the following pictures the gas flow in the suction case with guide plates is shown. First picture: deflection of gas flow in impeller. Notice the spinning free gas flow in front of impeller. Further pictures: distribution of pressure and velocity in suction case/ fan housing.
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KHD Humboldt Wedag GmbH
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KHD Humboldt Wedag GmbH
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KHD Humboldt Wedag GmbH
Votex area finished before impeller entree
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KHD Humboldt Wedag GmbH
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KHD Humboldt Wedag GmbH
Equal distribution of velocity before impeller entree
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KHD Humboldt Wedag GmbH
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