SUSTAINABLE DEVELOPMENT IN JHARIA COALFIELD INDIA dr kalyan
SUSTAINABLE DEVELOPMENT IN JHARIA COALFIELD, INDIA dr kalyan sen, director Central Fuel Research Institute, Dhanbad MGMI, NEW DELHI-8 -9 TH DEC. , 2 K MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 1
MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 2
Reserves in JCF: (After GSI-2000) (up to 1200 m depth) u. Only repository of prime coking coal in India u. Total reserves: 19, 430 Mt u. Prime coking : 5, 313 Mt u. Medium coking: 6, 164 Mt u. So called non-coking: 7, 953 Mt MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 3
PRODUCTION TREND OF COAL IN JCF (Mt) 35 O/C(Mt) U/G(Mt) 35 TOTAL(Mt) 30 30 25 25 20 20 15 15 10 10 Source: DGMS & Mo. C Reports(Different years) MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 1994 1990 1985 1980 1970 1965 1950 1945 1940 1935 1930 1925 1920 0 1915 0 1910 5 1905 5 Year 4
Annualized Growth Rate (%) in JCF 40 Production(Mt) Growth rate (%) 30 20 10 0 -10 1990 1985 1980 1975 1970 1965 1960 1955 1950 1945 1940 1935 1930 1925 1920 1915 1910 1905 -20 Source: DGMS & Mo. C Reports(Different years) MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 5
Annualized growth rate, %: 1910 14 1944 -66 0. 5 -4. 0 1925 2. 0 1988 22. 0 1935 -3. 0 1989 -13. 6 After nationalization : national 2 -3 % (as compared to GR 6 -8%) Sustainable development in any industrial system demands an increase in pdn by national GR level or decrease in the cost of pdn by same level. MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 6
Quality of Jharia coals: Chemical characteristics: Barakar Fmn Moisture (air dried) Ash VM(dmf) Carbon (elemental) (pure coal basis) Heat value (k cal/kg) MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K Raniganj Fmn 0. 9 -1. 8% 16. 7 -29. 7% 20. 5 -33% 88. 4 -91. 5%` 1. 4 -2. 3% 21. 3 -32. 3% 34. 7 - 40. 1% 84. 6 - 88. 4% 8613 -8819 8500 -8980 7
Quality contd…. u. Petrographic composition: u(Visible min. mat. Free basis) Characteristics Upper seams Lr. Seams Vitrinite Liptinite Inertinite Ro 56. 5 -70. 3% 1. 0 -3. 9%% 28. 1 -38. 3% 0. 9 -1. 25% 25. 3 -57. 3% 0. 6 -1. 4% ? 27. 3 -62. 1% 1. 25 -14. 3% MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 8
Quality contd…. u. Lr. Seam (I-V/VI/VII & VIII) coals of the region have high reflectance and produce good coke from washed coal having total reactive contents 55 -65%. u. Use of such coal as power coal is simply wastage of scarce coking coal resource MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 9
MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 10
Washed Coal Analysis Chemical (%) Moisture Ash V. M. ( air dry) East 1. 0 17. 0 West 1. 0 18. 3 15. 0 Petrographic (vol. %) Vitrinite 53. 0 45. 0 Semi vitrinite 5. 0 4. 8 Exinite (Liptinite) 0. 3 Inertinite 35. 0 31. 5 Min. Matter 14. 0 15. 2 -----------------------------Mean R 0% 1. 27 1. 29 MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 11
Washed Coal Coke Property Porosity % 48. 5 CRI 12. 6 CSR 72. 9 M 40 82. 6 M 10 9. 8 MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 12
4 - product separation Cost of washed coal is 3 times of raw coal 50 80 sh A. ar 40 60 Ch 50 30 40 20 30 20 10 Cleans 0 1. 25 Char. Ash% Fractional Yield 70 1. 35 1. 45 Foundry Coal 1. 55 1. 65 Power Coal 1. 75 1. 85 Rejects 1. 95 10 0 2. 05 Mid SP. gravity MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 13
MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 14
Figure 4 A- A typical product mix from beneficiation of difficult-to-wash coal ( Raw coal ash 35 -37%) Cleans (18% ash) Rejects 28% (60 -65% ash) 29% Middlings (34% ash) 21% MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K Foundry Fuel (28% ash) 22% 15
Conclusion u. Washing of lower seam coals ardent necessary u. Raw coal production level is to be increased by 6 to 8% or expenditure on production to be decreased by same level u. CFRI techniques(multi-stage washing) of optimum beneficiation of high ash coal may be helpful MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 16
Conclusion washing of ‘difficult-to-wash’ lower seam coals is a must to meet the requirement of the nation 3 beneficiation of the high ash coals from 3550% ash level to 17 -18% reduces the yield. Multi- stage/ stream washing will be the only cost-effective solution under the present crisis 3 MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 17
Conclusion The concept can be suitably retrofitted to the existing washeries without bringing major changes 3 Beneficiation with minimum discharge from the washeries strengthens the awareness for protecting the environment 3 MGMI-CONFERENCE, 8 -9 TH DEC. , 2 K 18
- Slides: 18