Coal and Ash Handling High Concentration Slurry Disposal Accepted at Power Plants
The conglomeration on “Coal and ash handling at the thermal power plants” held on November 19 to 21, 2012 at Indian Institute of Technology (IIT), Delhi, witnessed the participation of around 60 delegates from various thermal power plants, equipment and system suppliers, consultants across the nation.
New Delhi, India – Handling of coal and fly ash are a major challenge to the engineers in the thermal power plants. An efficient coal unloading system is the key to the movement of coal rake for optimum utilisation. High Concentration Slurry Disposal (HCSD) systems have proved to be very successful and economic for pumping of ash to the ponds.
Belt conveyors and pneumatic conveying systems are an integral part of the power plant for handling of coal and ash. However, it is important to understand the influence of different materials, grades of the same material on the handling and conveying performance of the materials and eventually on the system design. Identifying these areas this intensive course was organised by Foundation for Innovation and Technology Transfer (FITT); presented by Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), IIT, Delhi and sponsored by Macawber Beekay Pvt Ltd and Vogel Business Media. The topics addressed were coal handling, pneumatic conveying, high concentration slurry disposal and silo design. The company is involved in execution of turnkey projects for coal and ash handling in thermal power plants and has commissioned a large number of successful projects in the last 25 years.
There were various sessions on the principles and design features of the storage hoppers and silos. Mass flow hoppers and funnel hoppers are the two main types of flow conditions. The type of flow relevant for fly ash and the main considerations in the design of such silos were also touched upon.
The three day course was relevant to both designers and users of the coal handling plants and pipeline transportation and storage of bulk materials. There were also sessions on various aspects of system design, component selection and the conveying capability of different grades of fly ash. Much emphasis was laid upon design, operation, control and maintenance of systems, and case studies. Speaking on the benefits of the seminar Dr. Agarwal pointed, “the participants benefited from the discussion on various technologies.”
The eminent speakers with their wide experience spoke on an array of subjects. On the first day of the event, Dr. Agarwal spoke on, ‘Ash generation at the power plants and types of PC systems’ and ‘Air requirement and conveying characteristics’; Dr. Mark Jones, Director, Centre for Bulk Materials Handling, The University of Newcastle, Australia delivered lectures on ‘Feeders for PC conveying systems’ and ‘Flow properties for the silo design’ and Dr. V. Seshadri, IIT, Delhi highlighted on ‘Wet disposal of fly ash’. The second day was packed with lectures of Dr. Agarwal who spoke on ‘Scaling parameters’ and presented a case study on ‘Fly ash conveying design’. Dr. Craig Wheeler, Centre for Bulk Materials Handling, The University of Newcastle, Australia elaborated on ‘Coal handling and technical considerations’; Dr. S.N. Singh, IIT, Delhi emphasised on the ‘Selection of slurry pumps’. The day concluded with Dr. Jones’ lecture on ‘Fundamentals of hopper and silo design’. The third day started with Dr. Jones’ lectures on contemporary topics on ‘Comparison of vacuum and pressure conveying systems’; ‘Troubleshooting PC systems’ and ‘Flow problems and discharge aids’. Dr. Seshadri spoke on ‘Design of HCSD pipeline’. Dr. Singh highlighted on ‘Erosion in slurry pipelines’. Dr. Wheeler delivered lectures on ‘Belt conveyor design for coal handling’ and ‘Recent trends in mechanical conveyors’.
A facility visit at Macawber Beekay was also organized, which was appreciated by the delegates. Commenting on the frequency of the course, Dr. Agarwal said, “The next event will be held after two years.”