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8/19/2019 Reliable Storage of thermal energy
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Introduction
Speaker1 Harald Heinrici
/2%$ 3aster degree in !echanical engineering,
4ech. )ni*ersit Braunschweig
/2%$ 5 '&&& Schenck 6rocess !bH,
#eighing and feeding e7uip!ent
Head of R8D !echanical sste!s
Since '&&/ Schwedes + Schulze Schüttguttechnik !bH
9onsulting engineers for bulk solid technolog
3e!ber of working parties of1:DI-:9, :DI-;3
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Introduction
Schwedes + Schulze
#orking areas of Schwedes + Schulze Schüttguttechnik
- Silo design for flow
to a*oid1
arching, funnel flow
segregation
irregular flow, flushing
trouble in interaction of silo and discharge e7uip!ent
- 3easure!ent of flow properties
6roductopti!ization
>ualit control
Silo design for strength acc. to = /22/-?
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Introduction
"genda
Bulk solids and li7uids 5 is there a difference@
#hat happens inside a silo @
Stresses in silos
Secrets inside a silo
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Flow of Bulk Solids in Silos
Solid *s. Bulk Solid
4he *ertical stress results
in a horizontal stress.
4he stress ratio λ of bulk solids
is not constant, depends on
properties, stress histor, ..
on-elastic solid Bulk solid ;luid
4ablets ;luidized state
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Flow of Bulk Solids in Silos
Silo effect
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Flow of Bulk Solids in Silos
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Flow of Bulk Solids in Silos
Silo effect
Height
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Flow of Bulk Solids in Silos
Silo effect
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Flow of Bulk Solids in Silos
"rching and ;unnel ;low
"rching ;unnel Arat holingC
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Flow of Bulk Solids in Silos
Segregation
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Flow of Bulk Solids in Silos
Segregation
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Flow of Bulk Solids in Silos
3ass ;low and ;unnel ;low
Mass flow – funnel flow
3ass flow ;unnel flow
stagnant
zones
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Flow of Bulk Solids in Silos
;low 6rofile
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Flow of Bulk Solids in Silos
Benefits of 3ass ;low
3ass flow ;unnel flow
"rching + +
Rat holing - +
Segregation - +
Irregular flow - +
;looding - +
Residence ti!e distribution - +
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Stresses in Silos
Eanssen e7uation
=7uilibriu! of forces in z-direction1
Introduction of wall friction φwand stress ratio λ
Differential e7uation for the *ertical stress pv
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Stresses in Silos
Eanssen e7uation
"fter integration and assu!ing that the *ertical stress
at the top of the fill le*el e7uals & it follows for the *ertical stress1
4he e-function ter! approaches & for a large fill height Az
resulting in the !aFi!u! *ertical stress of1
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Stresses in Silos
Eanssen e7uation
;or a clindrical silo A"G) DG? the !aFi!u! *ertical stress results to1
Stress ratio1 appr. &.0
#all friction1 appr. ' &.0
6v g Jb D
Bulk solid1 *ertical stress proportional to the dia!eter Asilo1 s!all D
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Stresses in Silos
Silo da!age
9e!ent raw !eal silo with inner cone
Discharge seg!ent b seg!ent
*ia fluidization
Kaldenhoff, 3.L Schütte, E.L Hauser, ".1
"nwendungserfahrungen !it der neuen DI /&00 4eil
bei der Sanierung zweier Roh!ehlsilos
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Stresses in Silos
9racks on silo wall
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Stresses in Silos
9racks on silo wall
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Stresses in Silos
;low channel stresses
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Attrition of Bulk Solids
Silo to store sulphure pellets
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Attrition of Bulk Solids
Silo to store sulphure pellets
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Attrition of Bulk Solids
Silo to store iron ore pellets
4op of silo
Silo height
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Attrition of Bulk Solids
Silo to store iron ore pellets
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