A technique for prediction of coke CSR and influence of...
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11/12/2018 1 A technique for prediction of coke CSR and influence of gasification on physical strength of stamp charge coke 1 Presented by: Vijay Tiwary Tata Steel Ltd., Jamshedpur 49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS 1. 1. Introduction and Objective Introduction and Objective 1. 1. Introduction and Objective Introduction and Objective Outline of the Presentation . . . 2. 2. Importance of Coke CSR Importance of Coke CSR 3. 3. Determination of coke CSR Determination of coke CSR 4. 4. Effect of Coke CSR on Physical Strength of Coke Effect of Coke CSR on Physical Strength of Coke 5. 5. Prediction of coke CSR based on Physical Property Prediction of coke CSR based on Physical Property 2. 2. Importance of Coke CSR Importance of Coke CSR 3. 3. Determination of coke CSR Determination of coke CSR 4. 4. Effect of Coke CSR on Physical Strength of Coke Effect of Coke CSR on Physical Strength of Coke 5. 5. Prediction of coke CSR based on Physical Property Prediction of coke CSR based on Physical Property 2 6. 6. Results and Discussion Results and Discussion 7. 7. Conclusion Conclusion 6. 6. Results and Discussion Results and Discussion 7. 7. Conclusion Conclusion 49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
Transcript of A technique for prediction of coke CSR and influence of...
11/12/2018
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A technique for prediction of coke CSR and influence of gasification on physical strength of stamp charge coke
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Presented by: Vijay Tiwary
Tata Steel Ltd., Jamshedpur
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
1.1. Introduction and ObjectiveIntroduction and Objective1.1. Introduction and ObjectiveIntroduction and Objective
Outline of the Presentation . . .
2.2. Importance of Coke CSRImportance of Coke CSR
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
2.2. Importance of Coke CSRImportance of Coke CSR
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
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6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
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Coke in Blast Furnace
• A Thermal Role - coke furnishes the bulk of the energy and process heat
Coke in Blast Furnace
required for the process.
• A Chemical Role - coke provided the necessary reduction potential in the
form of carbon monoxide for the reduction process and the required carbon for
carburizing the liquid hot metal.
• Physical and Mechanical Role - coke firstly carries the weight of
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the overlying burden, and secondly forms a highly permeable ‘trickling
column’, ensuring ideal drainage of the molten material slag and iron while
providing gas distribution in the BF.
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• Nippon Steel Corp developed a methodology for determination of coke hot strength in 1970's
which is widely accepted.
What is CSR?
• The methodology studies, the effects of one of the key coke reactions in the blast furnace on
the strength of the coke.
• Standards for determination of CRI/CSR are:
ASTM D 5341
BIS : 4023
ISO : 18894
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Test Condition BIS:‐ 4023:1991 ASTM: D 5341/D 5341M‐17
Size of Coke (‐21+19)mm (‐22.4+19)mm
Comparative test condition for CSR test
( ) ( )
Sample Mass 200 gm 200 gm
Test Temperature 1100˚C ± 5˚C 1100˚C ± 5˚C
Rate of Flow of CO2 5 LPM 5LPM
Reaction time with CO2
120 Minutes 120 Minutes
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Revolution of I drum 600 (30 minutes @20 RPM)
600 (30 minutes @20 RPM)
Screening after rotation
10 mm Round Hole 9.5 mm Square Hole
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1.1. Introduction Introduction 1.1. Introduction Introduction
Outline of the Presentation . . .
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
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Coke Strength after reaction
+20 ±1 mm; 200 g 1100oC;120 min; 5 LPM CO2 20 rpm ; 30 min + 10 mm49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
Coke Sample before CSR Test (‐21+19) mm
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Coke Sample after reaction/gasification
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Coke Sample after reaction/gasification
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Reacted Coke Sample after tumbling in I‐ drum (+10 mm)
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Before After
Coke Strength After Reaction
Sample size : (20 ± 1) mm Sample size : 10 mm
A CSR value of 65 means 65 % mass is above 10 mm size after reaction
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1.1. Introduction and ObjectiveIntroduction and Objective1.1. Introduction and ObjectiveIntroduction and Objective
Outline of the Presentation . . .
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
Porosity of various Burden material
40 36.4
10
20
30
16
18.8
25.4
0Iron Ore Sinter Pellet Coke
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Porosity Apparatus
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Where,A is oven-dry weight; B is saturated surface weight; C is saturated submerged weight.
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
0
15
30
45
60
Porosity
Before Porosity After Porosity
0
75
150
225
300
Coke CCS
Before CCS After CCS
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62 64 66 68 70
Coke CSR
0
63 64 65 66 67 68 69
Coke CSR
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
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Difference in Coke Porosity after CSR Test
30
40
50
60
50.6
%
10
20
30
Before After
36.4
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1.1. Introduction and ObjectiveIntroduction and Objective1.1. Introduction and ObjectiveIntroduction and Objective
Outline of the Presentation . . .
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
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1
2.Furnace Heating- 1Hr
Reaction time 2 HrCooling time 1 hr
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Why need an alternative method
CRI – 4 Hours
1
3
2
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Total Time :7-8 Hours1. Sample Preparation Time: 3 Hours
CSR– 0.75 Hours
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
*Repeatability Limit (r) and Reproducibility Limit (R)
*Data Source ASTM D5341/D5341M − 17
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Coke cold compressive strength measurement
• Sample Size: ( - 21 + 19)mm.• Quantity: 200 g (30-35 pieces)• Drying: 1 Hr in Air oven.y g• Reporting: Avg of 3 test• Duration: 1 Hours
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
1.1. Introduction and ObjectiveIntroduction and Objective1.1. Introduction and ObjectiveIntroduction and Objective
Outline of the Presentation . . .
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
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Sl. Coke Class Coke CSR Range Avg. Coke CSR Avg. Coke CRI Avg. Coke CCS
1 CL‐1 68 70 68 4 24 2 252
Different properties of coke based on coke class
1 CL 1 68‐70 68.4 24.2 252
2 CL‐2 67‐67.9 67.34 24.1 249
3 CL‐3 66‐66.9 66.4 24.8 248
4 CL‐4 65‐65.9 65.5 25.7 240
5 CL‐5 64‐64.9 64.6 26.6 229
CL 66 CL‐6 63‐63.9 63.4 27.6 200
7 CL‐7 62‐62.9 62.6 27.8 184
8 CL‐8 61‐61.9 62.0 27.1 186
9 CL‐9 60‐60.9 60.1 30.1 180
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Relation between coke CSR and coke CCS
R² = 0.90
75
60
65
70
Avg
. Cok
e C
SR
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55160 185 210 235 260
Coke CCS
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
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Relation between coke CRI and coke CCS
R² = 0 8330
35
R = 0.83
20
25
30
Avg
. Cok
e C
RI
15160 185 210 235 260
Coke CCS
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Model Performance Tracker
Predicted CSR
61.6 300
350
Test 1 Test 2 Test 3
Sample ID
61.6± 3.3
C 0 / 0 02 8
Prediction performance view
50
100
150
200
250
Sample ID
CCS value:
SUBMIT
CLT 440 / 05.02.18
184.60
1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829
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Limitations with CCS test
• Sample Size
• Sample shape
• RAM Speed
• Load Cell position.
Factors influencing CCS test for Coke
• Coke quality
• Coal Blend composition
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
1.1. Introduction and ObjectiveIntroduction and Objective1.1. Introduction and ObjectiveIntroduction and Objective
Outline of the Presentation . . .
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
2.2. Why Coke CSR in Important?Why Coke CSR in Important?
3.3. Determination of coke CSRDetermination of coke CSR
4.4. Effect of Coke CSR on Physical Strength of CokeEffect of Coke CSR on Physical Strength of Coke
5.5. Prediction of coke CSR based on Physical PropertyPrediction of coke CSR based on Physical Property
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6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
6.6. Results and DiscussionResults and Discussion
7.7. ConclusionConclusion
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Conclusion
Porosity of coke changes significantly post gasification (> 30 %).
C ld i h (CCS) h l i i h h k d b dCold compressive strength (CCS) has a strong correlation with stamp charge coke and can be used as ameasure to predict strength of coke .
240 cold compressive strength of coke is requisite for producing coke CSR 65-66.
Higher the CCS, higher is the coke CSR and lowers the coke CRI.
2949TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
49TH OPERATING COMMITTE MEETING COAL, COKE AND COAL CHEMICALS
