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Model for Beneficiated Coal. dr kalyan sen Prof. Emeritus, Bengal Engineering & Science University,Shibpur Director, Central Coalfields Ltd. Former Director, Central Fuel Research Institute and Central Mining Research Instutute, Dhanbad. 9 th International Summit & Expo POWER INDIA 2007

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model for beneficiated coal

Model for Beneficiated Coal

dr kalyan sen

Prof. Emeritus, Bengal Engineering & Science University,Shibpur

Director, Central Coalfields Ltd.

Former Director, Central Fuel Research Institute and Central Mining Research Instutute, Dhanbad.

9th International Summit & Expo POWER INDIA 2007

25-27 October 2007 Mumbai, India.

coal scenario
Coal Scenario
  • Likely to treble in the next decade
  • Largest consumer – Power Utilities
  • Most of the TPP burn coal without any upgrading
  • Coal cleaning is one of the important action areas for achieving reduction in CO2 emission per kWh of electricity produced.
barriers for coal beneficiation
Barriers for Coal Beneficiation
  • Difficult washability characteristics of Indian Coals due to Geological reasons.
  • Back dated mining and preparation technologies
  • Uncertainty associated with the economic impact on the down stream processes.
silver linings
Silver Linings
  • Indian coals contain low Sulphur
  • Combustibility is good due to Geological reasons
  • Coal washed up to 55% elementary ash (equivalent to 34% overall ash) has good combustion properties
action desired
Action Desired
  • To transform from a qualitative understanding of the effect of coal quality parameters to a quantitative domain
  • An economic model considering several factors involved throughout the ‘mine-energy’ chain like:-

cost of coal, logistics, beneficiation technologies, efficiency improvements & environment benefits

models for beneficiated coal
Models for Beneficiated Coal
  • Coal Data Base
  • Simulation of Coal Beneficiation Process
  • Cost Model
coal data base
Coal Data Base
  • Full scale size-wise washability data
  • Fraction-wise chemical, heat value and ash composition data
  • Prediction of the quality parameters of the cleans
  • Studies on Combustibility of washed coal and slagging and fouling problems by Drop Tube Furnace tests
options of beneficiation process
Options of Beneficiation Process
  • Destoning followed by whole coal beneficiation
  • Combination of Dry and Wet schemes
  • Blending partly washed coal with unwashed lower size fractions
  • Use of the concept of “limiting elementary ash” to identify the optimum ash content for power generation
  • Multi-product washing schemes
simulation of coal beneficiation process
Simulation of Coal Beneficiation Process
  • Computer simulation of washability data (from module1) and efficiency of washers to identify optimum operation conditions to produce maximum yield at desired quality
  • Based on the washability potential the best economic option should be chosen
cost model
Cost Model
  • Cost and Quantity of raw coal
  • Transportation costs ( mine to washery and washery to power plant)
  • Scope and cost of Reject utilization
  • Savings in GHG generation at different levels of cleaning
  • Savings due to reduction in maintenance, ash handling, etc.
  • Savings due to improvement in energy efficiency
conclusions
Conclusions
  • New coal washeries of total capacity 100mt/yr should be created within a decade. Modules of 2.5, 5 and 10my/yr are techno-economically justified
  • Regulatory framework should be enforced to fix up the price of washed coal considering cost of production and direct & indirect benefits
  • Model for Beneficiated Coal should be utilized to help in decision making.