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 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 CO 2 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 ‘mine- energy’ chain like:- cost of coal, logistics, beneficiation technologies, efficiency improvements & environment benefits 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