Transcript 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
 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
 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
 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
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 ‘mineenergy’ chain like:cost of coal, logistics, beneficiation
technologies, efficiency improvements &
environment benefits

Models for Beneficiated Coal
Coal
Data Base
Simulation of Coal
Beneficiation Process
Cost Model
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
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
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 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
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.

THANKS