Rational structure of screw extruding machines for peat fuel production

1.

Saint-Petersburg State mining university
Technical university Freiberg Bergakademie
RATIONAL STRUCTURE OF SCREW
EXTRUDING MACHINES FOR
PEAT FUEL PRODUCTION
Postgraduate student:
Supervisor from Russia:
Supervisor from Germany:
Epifantsev K.V.
Prof. Dr.-Ing. habil. Мikhailov А.V.
Prof. Dr.-Ing. habil. J.-Uwe Repke
Bonn, 2011

2. Topicality of work

Russian peat stocks
• 47 % of the world's reserves
• 162,7 billion tons
• greatest stocks in the world
Major problems for the peat industry
• The
process
of
forming
the
peat mass is accompanied by low
moisture,
• relatively high required pressure for
the destruction of residual fiber peatforming plants and packing of
processed peat mixture.
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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3. Objectives

• System analysis to meet the requirements of GOST
• performance
• power consumption of the process.
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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4. Experimental unit (plant «BaltKotloMash»)

Experimental unit consist of: 1 - Scales (0.01 g), 2 - PC Software Suite N100 for the
analysis of the frequency converter, 3 - muffle microwave drying of individual granules, 4 peat fuel pellets, 5 - different shaping dies, 6 - Extruder by mincing 722-2M, 7 lever for submission of peat in the extruder chamber, 8 - frequency converter Hyundai
N100, 9 - electronic moisture meter AnD, 10 - boiling dryer
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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5. Screw extruding machine

Screw extruding machine consist of: 1-pusher, 2-cup loading, 3-screw channels, 4machine frame, 5-coverof the drive, 6-drive enclosure, 7-gear pair, 8-engine, 9pin screw clamp ring, 10-fit ring, 11-screw, 12-space roller, 13-screw shank, 14formative die.
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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6. Different fold processing

1-fold processing
S=1379 sm²/g
3-fold processing
S=3778 sm²/g
5-fold processing
S=3872 sm²/g
11-fold processing
S= 4970 sm²/g
At
high
moisture
content
peat
dry
matter concentration is low. The interaction forces between
particles are small. Research from Z. Chereshinski
photos were taken of processed peat. In the
presented picture you can see how the structure of
peat with an increase in recycling.
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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7. Different structure of pellets

Theoretical bases of technology of the lumpy, granulated
peat fuel production have been developed by I.N. Chisty,
M.P.Volarovich, S.N.Gamaynov and others. On the basis of this
research it has been established that quality of finished goods,
is mainly determined by the nature of peat and depends on
character of structurization in the course of extraction,
processing and drying of peat. Granulation of peat masses is
accompanied by the complex
physical and mechanical
phenomena.
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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8. Experimental Results

№ Shaft
rotation
speed,
Hz
1
2
3
4
5
10
20
30
40
50
The allotment of
material produced
from peat, without
prior processing, gr
15 sec
60 min
54,5
13 080
67,6
16 224
92
22 080
56,8
13 632
102,4
24 576
The allotment of
material produced
from peat, 1-fold
processing,gr
15 sec
60 min
91,7
22 008
102
24 480
121,7
29 208
133,4
32 016
90,6
21 744
The allotment of
material produced
from peat, 2-fold
processing, gr
15 sec
60 min
77,9
18 696
88,5
21 240
122
29 280
126,3
30 312
118
28 320
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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9. Result of experiment

№
Moisture, %
1
2
3
57
64
72
Amperage, А
1-fold
2-fold
processing, gr processing, gr
5,7
1,9
1,7
6,3
2,3
2,4
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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10.

Crush-test peat pellets on Tinius Olsen bramah press
50% moisture, Fmax=1750N
67,6% moisture, Fmax=1400N
63,7% moisture, Fmax=1150N
70 % moisture, Fmax=1200N
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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11.

12.

13.

14.

Press-test peat pellets on Autograph press
Press-kanal 110.25/40
55% moisture, Fmax=6972N
65% moisture, Fmax=4893,45N
60% moisture, Fmax=5235N
70 % moisture, Fmax=3306,950N
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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15.

Press-test peat pellets on Autograph press
Press-kanal 110.25/30
55% moisture, Fmax=6036N
65% moisture, Fmax=4104N
60% moisture, Fmax=5636N
70 % moisture, Fmax=3094N
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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16.

Press-test peat pellets on Autograph press
Press-kanal 110.25/20
55% moisture, Fmax=4859N
65% moisture, Fmax=4526N
60% moisture, Fmax=4535N
70 % moisture, Fmax=2823N
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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17. Conclusions

1. The experiments on the stand were recorded productiveness
machines depending of type shaft speed.
2.We have plots of the current strength of the moisture of the
processed material, which showed an increase in load at multiple
processing. The specific energy consumption increases dramatically
when the three-five times the processing in the laboratory setting
screw.
3. Stand for studying the process of semi rigid extruded peat mixture
allows you to define various parameters necessary for the
investigation of energy and of forming pellets.
4. The granulation process analysis in srew machine shows that now
among unsolved problems of peat fuel production are the following:
Influence on the process power consumption and quality of ready
peat fuel;
K.EPIFANTSEV .RATIONAL STRUCTURE OF SCREW EXTRUDING MACHINES FOR PEAT FUEL PRODUCTION
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18. Thank you for attention!