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Need for Pilot Plant Investigations and Role of a Consultant for the Design of Large Capacity Coal Washeries for Thermal Power Plants in India. National Seminar on “Coal Preparation & New Coal Washing Techniques” at IICM during December 3-4, 2010.

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  1. Need for Pilot Plant Investigations and Role of a Consultant for the Design of Large Capacity Coal Washeries for Thermal Power Plants in India National Seminar on “Coal Preparation & New Coal Washing Techniques” at IICM during December 3-4, 2010. kalyan sen, former Director, CFRI-cum-CMRI, Dhanbad. Director, CTec Pvt. Ltd. Kolkata & Chandan Das , CTec

  2. Contents Pilot Plant Investigation • Why at all do we need this? • Criteria for an ideal Pilot Plant Role of a consultant in designing a washery • Why a Consultant? Conclusion

  3. Pilot Plant Investigations Why at all do we need this? • To optimize the slurry circuit for preparation of coal, particularly from virgin seams. • To know the Particle size distribution of ROM, crushed, degraded coal and fines generated • To confirm the computer predicted results for practically achievable yield of cleans at a certain parameter of cut and/or Ash% • To determine the optimum size of screens, considering the kinetics of screening • Optimum quantity of water spraying during deslimming, rinsing, etc. • Sufficient washed coals for downstream trials, like combustion study, characteristics of ash forming minerals e.g. ash erosion, clinkering, agglutinating, etc. Contd….

  4. Why at all we need this? • Choice of a suitable crusher • Choice of a suitable screen of particular type and size • Finalization of type and size of washer • Optimum parameters and the range of variation for washing parameters • Choice of flocculants, etc. and rheological properties of thickened slurry • To overcome the limitations of testing lab to deliver the above said points Back to Content

  5. Criteria for an ideal pilot plant • Stability of the coal handling equipment e.g. Bunkers, Feeders, Chutes, Conveyors, Load out stations, etc. • To collect the requisite amount of sample (as per IS / ISO) without jeopardizing the system. • Minimum capacity of a pilot plant depends on the Top Size of coal viz. 40tph for -100mm, 2-3tph for -3mm feed, etc. Back to content

  6. Role of a Consultant in designing a Washery • Providing economically viable profitable solution to the optimum washery design problem. Next

  7. Why a consultant? • They know the subject in depth • They know all the angles • They know all the authorities • They know the laws on pollution and they know the means of solving the particular problem. • They spare you from studying a phase of engineering which is not your domain. • They know where to go to get any information needed, which will help them solve the problem. Back to Content

  8. Conclusion Learn your mistakes in a pilot plant Earn your profits in a commercial plant

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