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GRADING of POWER COALS. dr kalyan sen Former Director, CFRI-cum-CMRI, Dhanbad Prof Emeritus, BESU Shibpur. COALCONNECT,Nov.2007,Kolkata. Historical Facts. Historical fact Since 1924 Moisture and Ash Distinctly different from Classification of Coals

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Grading of power coals

GRADING of POWER COALS

dr kalyan sen

Former Director, CFRI-cum-CMRI, Dhanbad

Prof Emeritus, BESU Shibpur.

COALCONNECT,Nov.2007,Kolkata


Historical facts
Historical Facts

Historical fact

  • Since 1924

  • Moisture and Ash

  • Distinctly different from Classification of Coals

  • Study Group constituted by GoI in 1962 – proposed UHV= GCV - Ash penalty

  • CFRI proposed

  • UHV= 8900 – 138(A+M), kcal/kg ,ash & moisture% at 60% RH and 40o C

  • UHV = 8900 – 138(A+M) – 150(19.0-VM) ’’ for LVLM coals, ash, moisture and VM as analysed basis.

  • UHVfor Coal grading system implemented in 1979


Shortcomings of uhv
Shortcomings of UHV

  • Based upon coals av.in 1960s – generally Jharia, Bokaro coalfields, where GCV of pure coal ~ 8900kcal/kg

  • Combustion data from Stoker fired boilers

  • UHV = 0 for A+M = 64.5%

  • UHV = ( - ) for High ash coals, suitable for Fluid Bed Boilers, ash >65%

  • UHV > GCV for low ash washed coals for ash < 10%


New system proposed
New System - Proposed

  • GCV, as recd basis, determined for every consignment as per ISO/BIS, by lab analysis.

  • “ash penalty” mainly depends upon efficiency of combustion boiler,

  • Additional parameters : ash and moisture as shown in the matrix (next slide)

  • Sulphur may be considered as discrete parameter.



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