new technologies for drying sections - gzs · 2016. 5. 17. · 22 new technologies for drying...

We accept the challenge!www.andritz.com Thomas Oswald

Comparison of different conceptsNew technologies for drying sections

2 New technologies for drying sections, DITP 2011

New technologies for drying sections

Case study contact drying

Cast cylinder

Steel cylinder

High temperature cylinder

Case study impingement drying

Indirect

Direct

Double sided

Summary

Contents


Drying sectionLayout for case studies

Vacuum cylinder

Single tier Double tier

Basis weight: 36 g/m²

Machine speed: 1600 m/min

after Press: 43 %




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary


Cast cylinderSimulation result

Cylinder No.Sheet thicknessz - Direction [mm]

Shee

t Tem

pera

ture

[°C

]




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary


50

55

60

65

70

75

80

85

90

95

100

40 50 60 70 80 90 100

Sheet Dryness [%]

Shee

t Tem

pera

ture

[°C

]

Steel Cast

Steel cylinderComparison sheet temperature vs. sheet dryness

Δ Sheet Dryness


Steel cylinderComparison of drying rates from simulation

Reference for steel cylinder rebuild: German board mill, installed in 07/2011

16.7

17.8

16

16.2

16.4

16.6

16.8

17

17.2

17.4

17.6

17.8

Dry

ing

Rat

e [k

g/m

²h]

Cast Steel




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary



Labor arrangement Pilot plant

Test arrangement

Pneumaticcylinder

Pneumatic cylinder

Pneumatic cylinder

Heated platen

Heated platen

Drying Station #1

Paper

Drying Station #2



0

20

40

60

80

100

50 100 150 200 250

Cylinder Surface Temperature [°C]

Dryi

ng R

ate

[kg/

m²h

]

36g/m² 48g/m² 100g/m²

Labor arrangement Pilot plant

Results drying rates form tests

0

20

40

60

80

100

50 100 150 200 250

Cylinder Surface Temperature [°C]

Dryi

ng R

ate

[kg/

m²h

]

70g/m²


High temperature cylinderLayout drying section for simulation


High temperature cylinderComparison sheet temperature vs. sheet dryness

50

55

60

65

70

75

80

85

90

95

100

40 50 60 70 80 90 100

Sheet Dryness [%]

She

et T

empe

ratu

re [°

C]

All Steel All Cast 4x High Temperature + Cast


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42

Cylinder No.

Shee

t Dry

ness

[%]

All Cast All Steel 4x High Temperature + Cast

High temperature cylinderComparison sheet dryness

2

7


High temperature cylinderComparison drying rates from simulation

Reference: PM2, Corrugated Services Inc., Forney, Texas

16.7 17.8

72.9

0

10

20

30

40

50

60

70

80D

ryin

g R

ate

[kg/

m²h

]

Cast Steel High Temperature




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary

Drying Fabric

Cylinder

Paper

Indirect Impingement


Impingement indirectLayout drying section for simulation


50

5560

65

70

75

8085

90

95

100

40 50 60 70 80 90 100

Sheet Dryness [%]

Shee

t Tem

pera

ture

[°C

]

All Cast 2x Indirect + Cast

Impingement indirect Comparison sheet temperature vs. sheet dryness

Δ Sheet Dryness


Impingement indirectComparison drying rates from simulation

16.7

32.2

0

5

10

15

20

25

30

35

Dry

ing

Rat

e [k

g/m

²h]

Cast Cast + Indirect




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary

Drying Fabric

Paper

Direct Impingement


Impingement directLayout drying section for simulation


Impingement directComparison sheet temperature vs. sheet dryness

50

55

60

65

70

75

80

85

90

95

100

40 50 60 70 80 90 100

Sheet Dryness [%]

Shee

t Tem

pera

ture

[°C

]

2x Indirect 2x Direct


Comparison drying rates from simulationImpingement direct

16.7

32.2

80.3

0

10

20

30

40

50

60

70

80

90

Dry

ing

Rat

e [k

g/m

²h]

Cast Cast + Indirect Direct




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary

Drying Fabric

Paper

Double Sided Impingement


Impingement double sided

Pilot machine

Test arrangement

Impingement dryer


Impingement double sidedResults

0

20

40

60

80

100

120

140

200 220 240 260 280 300 320 340 360

Impingement Temperature [°C]

Dry

ing

Rat

e [k

g/m

²h]


Impingement double sidedLayout drying section for simulation


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42

Cylinder No.

She

et D

ryne

ss [%

]

All Cast 2 x Indirect + Cast 2 x Direct + Cast 2 x Double Sided + Cast

Impingement double sidedComparison sheet dryness

16

10


Impingement double sidedComparison drying rates from simulation

32.2

80.3

133.3

0

20

40

60

80

100

120

140D

ryin

g R

ate

[kg/

m²h

]

Cast + Indirect Direct Double Sided


Sheet drynessDifferent positions of double sided impingement

0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42

Cylinder No.

Shee

t Dry

ness

[%]

Cast In the Middle After Press




Cast cylinder

Steel cylinder



Indirect

Direct

Double sided

Summary


Comparison all drying rates from simulation

16.7 17.8

72.9

32.2

80.3

133.3

0

20

40

60

80

100

120

140

Dry

ing

Rat

er [k

g/m

²h]

Cast

Steel

High Tempera

ture

Cast +

Indire

ct

Direct

Double Sided


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We accept the challenge!www.andritz.com Thomas Oswald

Comparison of different conceptsNew technologies for drying sections

new technologies for drying sections - gzs · 2016. 5. 17. · 22 new technologies for drying...

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