Vertical Spindle Mill Performance Curves - Coal Tech Nomogram.pdf · at Pilot Mill Nominal...
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© CoalTech Pty Ltd 2004 Fig 1. Expected Fineness for a Given Petrographic Analysis at Pilot Mill Nominal Operating Conditions 2 Fig 2. Expected Capacity for a Given Fineness and Hardgrove Grindability Index (HGI) 3 Vertical Spindle Mill Performance Curves based on pilot scale tests 1 35 40 45 50 55 60 65 70 75 80 85 Predicted Fineness (% minus 75mm) 35 40 45 50 55 60 65 70 75 80 85 30 40 50 60 70 80 90 HGI 10 15 20 25 Rate = 500 kg/hr Roll Pressure = 3 to 4 MPa Roll Pressure = 2 MPa Roll Pressure = 6 MPa Data only shown for roll pressures 3 to 4 MPa Notes: For detailed information on how these curves were generated see CoalTech’s Report - ACARP Research Project C13062 “Predicting Pulveriser Performance” by P. Bennett, 2004. While the predicted fineness results are for ACIRL’s pilot scale mill they do indicate the ranking of coals in terms of PF fineness based on Petrographic Analysis, see Fig. 3. The capacity factors given by Fig. 2 are similar to the values given by mill manufacturers’ curves and are based on Fig. 4. The fineness determined by Fig. 1 indicates whether the mill operating conditions (roll pressure, classifier setting, etc) will required to be increased or decreased from the mill’s “nominal” settings to achieve a fineness of 70% passing 75 m. 1 2 3 4 Fig 3 Fit to Maceral Group Model Fig 4 Specific Power 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 55 60 65 70 75 80 85 Mean Maximum Reflectance of Vitrinite % Vitrinite +Lipitinite vol % 20 30 40 50 60 70 80 90 100 HGI 35 40 45 50 55 60 65 70 75 80 85 90 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Capacity Factor 55 60 65 70 75 80 85 25 30 For this 40 HGI coal mill conditions can be decreased to achieve a fineness of 70% Note 4
Transcript of Vertical Spindle Mill Performance Curves - Coal Tech Nomogram.pdf · at Pilot Mill Nominal...
© CoalTech Pty Ltd 2004Fig 1. Expected Fineness
for a Given Petrographic Analysisat Pilot Mill Nominal Operating Conditions
2Fig 2. Expected Capacity for a Given Fineness
and Hardgrove Grindability Index (HGI)
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Vertical Spindle Mill Performance Curvesbased on pilot scale tests1
35 40 45 50 55 60 65 70 75 80 85
Predicted Fineness (% minus 75 mm)
35
40
45
50
55
60
65
70
75
80
85
30 40 50 60 70 80 90HGI
10
15
20
25Rate = 500 kg/hr
Roll Pressure = 3 to 4 MPaRoll Pressure = 2 MPaRoll Pressure = 6 MPa
Data only shown for roll pressures 3 to 4 MPa
Notes:For detailed information on how these curves were generated see
CoalTech’s Report - ACARP Research Project C13062 “PredictingPulveriser Performance” by P. Bennett, 2004.
While the predicted fineness results are for ACIRL’s pilot scale millthey do indicate the ranking of coals in terms of PF fineness basedon Petrographic Analysis, see Fig. 3.
The capacity factors given by Fig. 2 are similar to the values givenby mill manufacturers’ curves and are based on Fig. 4.
The fineness determined by Fig. 1 indicates whether the milloperating conditions (roll pressure, classifier setting, etc) will requiredto be increased or decreased from the mill’s “nominal” settings toachieve a fineness of 70% passing 75 m.
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2
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Fig 3 Fit to Maceral Group Model Fig 4 Specific Power
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
55
60
65
70
75
80
85
Mean Maximum Reflectance of Vitrinite %
Vitrinite +Lipitinite vol %
20
3040506070
8090
100
HGI 35 40 45 50 55 60 65 70 75 80 85 90
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6Capacity Factor
55
60
65
70
75
80
85
25 30
For this 40 HGIcoal mill conditionscan be decreasedto achieve afineness of 70%
Note 4
