DISEÑO DE FUNDACIONES DE
MULTIPLES MOLINOS VERTICALES
ENFOCADO A MITIGACION DE
VIBRACIONES DURANTE SU
OPERACIÓN CONJUNTA
Guillermo Etse PhD,
Juan Grassetto, Monica Perosa
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
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
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)
Spectral Analysis of
Surface Waves - SASW
Impact Force
Cross Hole
Down Hole
ASSESSMENT TESTS OF
SOIL DYNAMIC PROPERTIES
F
Force spectrum F(t)
M
K
T1
T2
t
V
(M1,K1) (M2,K2)
V
Response spectrum of the foundation system
Resonance
Multiple Vertical Mills
Mill Acceleration Spectra
MILL 2 MILL 1
Control Room
SYSTEMS OF MULTIPLE VERTICAL MILLS 1. CEMENT GRINDING PLANT
IN SOUTH AMERICA
SYSTEMS OF SAG MILL AND STATOR 2. MINING PLANT IN SOUTH AMERICA
SYSTEMS OF MULTIPLE VERTICAL MILLS 3. CEMENT GRINDING PLANT IN BRAZIL
CASE STUDY 1
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
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
-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
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
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
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)
CONCLUSIONES Y RECOMENDACIONES
AUTORES
Etse, Guillermo
Grassetto, Juan Pablo
Perosa, Mónica
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