Page 64 - Annual Report_21-22

DESIGN AND PROJECT ENGINEERING

Consultancy service for design and development of high concentration slurry
disposal (HCSD) system.
Sasan Power Ltd., Sasan, Singrauli, MP under Reliance disposal sites. Our department carried out all the required
Power offered a consultancy project to IMMT to carry out experiments and computations on the coal ash samples
the Rheology of their coal ash slurry samples and provide provided by the client to determine the pressure drop for
Basic Design Engineering for their High Concentration the proposed layout, considering elevation head, start-up
Slurry Disposal (HCSD) system. As per the proposed layout pressure and pipeline losses. Finally, a recommendation
shared by the client, a total of 20 km of 400 NB cast basalt on the number of pumps required along the line and
lined pipeline has to be laid from the power plant area the optimum distance between them, along with other
to the mines gate and a total of 10.5 km of the same important parameters for satisfactory performance of the
diameter pipeline has to be laid from mines gate to the two system has been provided to the client.

Particle size distribution of representative ESP fly ash Variation of pH with mixing time for ESP mixed fly ash
samples prepared from 1st to 7th fields’ fly ash slurry samples in distilled water medium (pH=6.3) at
wt. concentrations of 70% and 75%

Rheogram of mixed ESP fly ash slurry, Time taken for re-suspension of mixed ESP ash slurry,
Cw = 70% - 78% seconds

Rheological investigation of Ash dyke fly ash samples for pipe line transportation at BALCO,
Korba, and Chhattisgarh state.

BALCO, Thermal Power Plant, Korba, Chhattisgarh under with rheological properties, material density, maximum
Vedanta Alumina Ltd., offered a consultancy project static settled concentration, stabilized pH, mixing time
to carry out a rheological investigation of their fly ash and energy required for re-suspension and pressure drop
and bottom ash samples for both 1200 MW and 540 for different pipe sizes and solids throughput were also
MW power plants. Under this project, the rheological studied for the coal ash samples supplied by the client.
properties were studied for coal ash slurries at different Based on the studies carried out, basic design engineering
solids concentrations, for both best coal (with lower of an HCSD system and recommendations for its seamless
ash percentage) and worst coal (one with higher ash operation were provided to the client.
percentage), as per the requirements of the client. Along
62 ANNUAL REPORT 2021-22