Characteristics of the HGI Fractions of the Indian Coal Blended with Imported Coals

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K. H. Arunkumar
V. Saravanan

Abstract

The blends of a high ash Indian coal with three coals of different foreign origins -Australia, Russia and Indonesia were
subjected to HGI testing as per ASTM D 409 and the resulted fractions obtained in the coarser and finer portions of ASTM
200 mesh (75 microns) were assessed for their characteristics in respect of proximate and ultimate parameters, alpha
quartz and combustion reactivity. The similar studies were also carried out for the parent coals. HGI values were found
additive in case of Indian-Indonesian coal blends and the same was found non-additive in respect of Indian-Russian and
Indian-Australian coal blends. Considerable variation in properties was observed in the coarser and finer fractions of the
ASTM 200 mesh for parent Indian and Indonesian coals compared to parent Australian and Russian coals. This indicates
the disproportion of the coals and coal blends particles during the sieving process after subjecting to HGI test. The variation
of alpha quartz content in the coarser and finer fractions indicate that there is a segregation of free minerals in the coarser
and finer fractions. The conversion plots obtained through TGA for the coarser and finer fractions indicate that there is no
maceral segregation.

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How to Cite
Arunkumar, K. H. ., & Saravanan, V. . (2022). Characteristics of the HGI Fractions of the Indian Coal Blended with Imported Coals. Power Research, 17(2), 121–124. https://doi.org/10.33686/pwj.v17i2.1076

References

  1. Carpenter AM. Coal blending for power stations Coal blending for power stations. IEA Coal Research. 1995.
  2. Sarkar P, Mukherjee A, Sahu SG, Choudhury A, Adak AK, Kumar M, Choudhury N, Biswas S. Evaluation of combustion characteristics in thermogravimetric analyzer and drop tube furnace for Indian coal blends. Applied Thermal Engineering. 2013; 60:145–51. https://doi.org/10.1016/j.applthermaleng.2013.06.054
  3. Raaj SR, Arumugam S, Muthukrishnan M, Krishnamoorthy S, Anantharaman N. Characterization of coal blends for effective utilization in thermal power plants. Applied Thermal Engineering. 2016; 102:9–16. https://doi.org/10.1016/j.applthermaleng.2016.03.035
  4. Chelgani SC, Hower JC, Jorjani E, Mesroghli S, Bagherieh AH. Prediction of coal grindability based on petrography, proximate and ultimate analysis using multiple regression and artificial neural network models. Fuel Processing Technology. 2008; 89:13–20. https://doi.org/10.1016/j.fuproc.2007.06.004
  5. Hansen AE, Hower JC. Notes on the relationship between microlithotype composition and Hardgrove grindability index for rank suites of Eastern Kentucky (Central Appalachian) coals. International Journal of Coal Geology. 2014; 131:109–12. https://doi.org/10.1016/j.coal.2014.06.010
  6. Matin SS, Hower JC, Farahzadi L, Chelgani SC. Explaining relationships among various coal analyses with coal grindability index by Random Forest. International Journal of Mineral Processing. 2016; 155:140–6. https://doi.org/10.1016/j.minpro.2016.08.015
  7. Rubiera F, Arenillas A, Fuente E, Miles N, Pis JJ. Effect of the grinding behaviour of coal blends on coal utilisation for combustion. Powder Technol. 1999; 105:351–6. https://doi.org/10.1016/S0032-5910(99)00158-8
  8. Mathews JP, Krishnamoorthy V, Louw E, Tchapda AHN, Castro-Marcano F, Karri V, Alexis DA, Mitchell GD. A review of the correlations of coal properties with elemental composition. Fuel Processing Technology 2014; 121:104–13. https://doi.org/10.1016/j.fuproc.2014.01.015
  9. Sengupta AN. An assessment of grindability index of coal. Fuel Processing Technology. 2002; 76:1–10. https://doi.org/10.1016/S0378-3820(01)00236-3
  10. Biswas S, Choudhury N, Sarkar P, Mukherjee A, Sahu SG, Boral P, Choudhury A. Studies on the combustion behaviour of blends of Indian coals by TGA and Drop Tube Furnace. Fuel Processing Technology. 2006; 87, 191–9. https://doi.org/10.1016/j.fuproc.2005.05.002
  11. Helle S, Gordon A, Alfaro G, García X, Ulloa C. Coal blend combustion: Link between unburnt carbon in fly ashes and maceral composition. Fuel Processing Technology. 2003; 80:209–23. https://doi.org/10.1016/S0378-3820(02)00245-X