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DISEÑO DE FUNDACIONES DE
MULTIPLES MOLINOS VERTICALES
ENFOCADO A MITIGACION DE
VIBRACIONES DURANTE SU
OPERACIÓN CONJUNTA
Guillermo Etse PhD,
Juan Grassetto, Monica Perosa
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MOTIVACIÓN
• Mitigar vibraciones producto de la operación
simultanea de múltiples molinos verticales en
plantas cementeras
• Reducir potencialidad de resonancia dinámica
• Mejorar la sustentabilidad de la operación de
molienda de crudo, cemento y carbon
• Reducir CapEx
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AGENDA
• Introducción
• Metodología de diseño dinámico de fundaciones
• Caso de análisis
• Operación aislada vs. Múltiple de molinos verticales
• Efecto de la rigidez de los suelos de fundación
• Efecto de la distancia entre molinos
• Costos y acciones para reducir CapEx
• Conclusiones y Recomendaciones
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INTRODUCCIÓN
F
M
K
Static Method (Strength)
F
M
K
Equivalent mechanical system
Strength
K1
K2
Stiffness
R1
R2
K1 (stiff soil)
K2 (soft soil) K =
F
U
F(t)
M
K
Dynamic Method (wave transmision)
T1
T2
t
V
V (wave velocity) = V(K,) (frecuency) = 1/T = (K,M)
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Spectral Analysis of
Surface Waves - SASW
Impact Force
Cross Hole
Down Hole
ASSESSMENT TESTS OF
SOIL DYNAMIC PROPERTIES
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F
Force spectrum F(t)
M
K
T1
T2
t
V
(M1,K1) (M2,K2)
V
Response spectrum of the foundation system
Resonance
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Multiple Vertical Mills
Mill Acceleration Spectra
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MILL 2 MILL 1
Control Room
SYSTEMS OF MULTIPLE VERTICAL MILLS 1. CEMENT GRINDING PLANT
IN SOUTH AMERICA
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SYSTEMS OF SAG MILL AND STATOR 2. MINING PLANT IN SOUTH AMERICA
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SYSTEMS OF MULTIPLE VERTICAL MILLS 3. CEMENT GRINDING PLANT IN BRAZIL
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CASE STUDY 1
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0,00
1,00
2,00
3,00
4,00
5,00
6,00
7,00
8,00
9,00
10,00
0 5 10 15 20 25 30
V (mm/seg)
Freq. (Hz)
Velocities Vertical Direction
3 Mills inOperation
CASE STUDY 1
1 vs 3 Mills in Operation
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0,00
2,00
4,00
6,00
8,00
10,00
12,00
14,00
0 5 10 15 20 25 30
Vz (mm/seg)
Freq. (Hz)
3 Mills in Op
3 Mills in Op. - Soft Soils
CASE STUDY 1
3 Mills in Operation:
Influence of Soil Mechanical Features
Velocities in Vertical Direction
0,00
0,30
0,60
0,90
1,20
1,50
1,80
0 5 10 15 20 25 30
Vy (mm/seg)
Freq. (Hz)
Velocities in Horizontal Direction
3 Mills in Op.
3 Mills in Op. - Soft Soils
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-0,30
0,20
0,70
1,20
1,70
2,20
0 5 10 15 20 25 30
Vy (mm/seg)
Freq. (Hz)
Horizontal Velocity
3 Mills in Op.
3 Mills in Op.-50% Distance
CASE STUDY 1
3 Mills in Operation: Influence of the
horizontal distance between Cement Mills
0,00
2,00
4,00
6,00
8,00
10,00
12,00
14,00
0 5 10 15 20 25 30
Vz (mm/seg)
Freq. (Hz)
Vertical Velocities
3 Mill in Op. - 100% distance
3 Mills in Op.-50% Distance
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Mill 3
Mill 4 Control Room
CASE STUDY 2
2 Vertical Mills in Operation:
Influence of the Mill
Operational Frequencies
Frequency (Hz)
Ve
loci
ty (
mm
/s)
Mill 3 Mill 4
Vibration Velocities on Mills 3 and 4. Mill 3 in operation, Mill 4 stop
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Only M3 in Operation M3 operating with variable frequency and M4 in steady state at 10 Hz
Frequency (Hz)
Ve
loci
ty (
mm
/s)
Only M3 in Operation M3 operating with variable frequency and M4 in steady state at 20 Hz
Ve
loci
ty (
mm
/s)
Frequency (Hz)
CASE STUDY 2
2 Mills in Operation: Influence
of the Mill Operational Frequencies
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CASE STUDY 2
2 Mills in Operation: Influence
of the Mill Operational Frequencies
Only M3 in Operation
M3 and M4 operating in resonance
Frequency (Hz)
Ve
loci
ty (
mm
/s)
Only M4 in Operation Only M3 in Operation M3 and M4 operating at 20Hz M3 and M4 operating at variable frequency in resonance
Ve
loci
ty (
mm
/s)
Frequency (Hz)
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CONCLUSIONES Y RECOMENDACIONES
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AUTORES
Etse, Guillermo
Grassetto, Juan Pablo
Perosa, Mónica
SAXUM Engineered Solutions
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