Gross Calorific Value -a Guide to Optimum Washing of Power Coals

Gross Calorific Value -a Guide to Optimum Washing of Power Coals

GROSS CALORIFIC VALUE A GUIDE TO OPTIMUM WASHING OF POWER COALS Chandan Das, Senior Research Fellow and Dr Kalyan Sen, Prof. Emeritus Bengal Engineering & Science University, Shibpur 2nd Asian Mining Congress, Kolkata, 17-19th Jan.2008

Basic Issue Requirement of power plants Washed coal with consistent quality Quality Parameters : GCV, Ash and MoistureAR (as received) basis Introduction About 70% coal produced in India is consumed in thermal

power plants. Indian non-coking coals : Permian era, optimum maturity and petrological composition High Volatile Matter low Sulphur, Mercury, Nitrogen and Chloride, etc. Burn efficiently Large amount of Stones and obvious dirt lead to loss of sensible heat Erosion in coal handling, crushing, grinding, ash handling, etc.

Gross Calorific Value (GCV) Gross calorific value of coal depends upon its chemical composition, which is governed by geological environment during its coalification process, mainly on its maturity. Combustible elements present in coal : Carbon, Hydrogen, Sulphur, etc

Non-combustible mineral contents : Silica, Iron, Aluminum, Calcium, Magnesium, etc. GCV-Ash Relationship

GCV Ash Relationship Close relation between ash content vs Gross Calorific Value (GCV) of coal For Central Coalfield (CC) coals : GCV at zero ash (pure) coal varies from 7000 to 8000 kcal/kg, av. being 7800 kcal/kg GCV becomes zero (completely inert) at very high ash content i.e. about 80 to 90%, av. being 88%.

It is also proved that both ash and GCV contents are related to the Relative Density (RD) of coal. Yield & Quality of Washed Coal Fractional yield is a random property varies from seam to seam and day to day Cumulative yield at any cut point depends

upon the Limiting GCV vs sp gr of cut and Efficiency of Washers If the Particle of Limiting GCV is combustible in a given furnace, then all other particles are ensured to burn Optimum Result an example To limit GCV of particles to 3000 kcal/kg, the

corresponding characteristic ash will be about 55% at RD of cut 1.875. The cumulative GCV of theoretical cleans will be 5200 kcal/kg and ash content 30% with cumulative yield of 85%. Conclusion Concept of limiting GCV can optimize coal washing

It is suggested that if the worst particle can be effectively burnt in a given system of combustion, all better quality particles can be used up at ease. The actual cumulative yield of cleans and their quality will depend upon the raw coal supplied from day to day and efficiency of washing. However, the efficiency of combustion will remain practically the same. GCV is suggested to be used as a major factor to grade the

coal as well as to optimize

Recently Viewed Presentations

  • Volcanos - Book F Chapter 6

    Volcanos - Book F Chapter 6

    Shield Volcano- broad, gently sloping volcano formed by quiet eruptions of basaltic lava.. Composite Volcano-volcano built by alternating explosive and quiet eruptions that produce layers of tephra and lava; found mostly where Earth's plates come together and one plate sinks...
  • Sources of English Law Unit 2 Part One:

    Sources of English Law Unit 2 Part One:

    Whitely v Chappel (1868) LR 4 QB 147A statute made it an offence 'to impersonate any person entitled to vote.' The defendant used the vote of a dead man. The statute relating to voting rights required a person to be...
  • Executive branch - kewa

    Executive branch - kewa

    Nuclear Regulatory Commision. The U.S. Nuclear Regulatory Commission (NRC) was created as an independent agency by Congress in 1974 to ensure the safe use of radioactive materials for beneficial civilian purposes while protecting people and the environment.
  • Peritonitis - Semmelweis Egyetem

    Peritonitis - Semmelweis Egyetem

    Peritonitis Peritonitis Intra-abdominal infections Two major clinical manifestations Early or diffuse infection results in localised or generalised peritonitis Bacterial peritonitis is classified as primary or secondary Late and localised infections produces an intra-abdominal abscess Pathophysiology depend on competing factors of...
  • The War of the Roses -

    The War of the Roses -

    Myth and Reality of the most epic period in English History ... at the battle of Bosworth Henry becomes Henry VII FOUNDS THE TUDOR DYNASTY The War of the Roses Myth and Reality of the most epic period in English...
  • Welcome Welcome to to CASCON CASCON 2006 2006

    Welcome Welcome to to CASCON CASCON 2006 2006

    Welcome to CASCON 2006 Workshop on Model Fusion October 17, 2006 Some people to thank Organizers: Kim Letkeman (IBM), Jourgen Dingel (Queens), Zinovy Diskin (Queens), Marsha Chechik (Toronto), Steve Easterbrook (Toronto), Sebastian Uchitel (Imperial College) Additional speakers: Jon Whittle (George...
  • Do You Care Enough to Share Enough? Energy

    Do You Care Enough to Share Enough? Energy

    The desperate man shouted, "Help, I can't swim!" The young man, an excellent swimmer, only turned his head to watch as the man floundered in the water, sank, came up sputtering in total panic, and then disappeared forever. The family...
  • Difference of Convex (DC) Decomposition of ... - Princeton

    Difference of Convex (DC) Decomposition of ... - Princeton

    Sum of squares optimization: scalability improvements and applications to difference of convex programming. Georgina Hall. Princeton, ORFE. Joint work with