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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