Nature protection technologies

3.2.3. Bottom ash/slag removal

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.3. Bottom ash/slag removal

3.2.3.1. About reasonability of transferring slag-tap boilers to dry bottom ones at TPP reconstruction

A.M. Arkhipov, Y.M. Lipov, V.Y. Putilov, MPEI(TU)

N.I. Solovyev, Open JSC «CKB Energoremont»

 Technical solutions for transferring slag-tap boilers P-50 and TP-87 combusting Kuznetsky lean coal to dry bottom boilers are given. The issues of evaluation of complex efficiency of implementing the suggested technical solutions are considered.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.3. Bottom ash/slag removal

3.2.3.2. Influence of slag removal technology on harmful emissions from power boilers

Kotler V.R., Shtegman A.V., JSC «All-Russia Thermal Engineering Institute»

 In the report the data confirming the worldwide tendency to increase of a share of coal for generating of the electric power are resulted. Similar process is observed in Russia, despite of rather low prices for natural gas.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.3. Bottom ash/slag removal

3.2.3.3. Segregation, classification and dewatering of slag and bottom ash

J.J. Hycnar, Ecocoal Consulting Center, Katowice, Poland

P. Pasiowiec and J. Brożyna, Progress Eco S.A., Dobrów, Poland

 The purpose of dewatering and classification of slag from hard coal combustion is the elimination of slag hydro-transport to disposal lagoons thus reducing  water consumption as well as costs of hydro-transport and storage of water-slag or water-ash-slag suspension  and of slag aggregates’ production. The developed technology is based on application of centrifugal sieves, enabling not only slag dewatering but also its classification and removal of remaining bottom ash and cenospheres.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.3. Bottom ash/slag removal

3.2.3.4. Recirculation of bottom ash into the fly ash handling process and an overview on coal ash reutilization. A case study: Fiume Santo power station

M. Bertolino, E.On Italia, Italy

D. Coppola, D. Ricci, R.Sorrenti, Magaldi Power S.p.A., Salerno, Italy

 Magaldi Power S.p.A. has developed and installed the MAC-Magaldi Ash Cooler® system for dry extraction, cooling and handling of bottom ash from pulverized coal-fired boilers.

The MAR-Magaldi Ash Recycling system is an improvement of the MAC technology; it is a process to recycle dry bottom ash into the combustion chamber in order to turn it into fly ash.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.3. Bottom ash/slag removal

3.2.3.5. The Application of Air-cooled Dry Bottom Ash Handling Technology at Coal Fired Power Plant

Qian Yu, Beijing Guodian Futong Science and Technology Development Co., Ltd, Beijing, China

 The environment protection requirements are more and more stringent in power plants of China, in order to reduce the polluting load from the power plant effluent, air-cooled dry bottom ash handling system, one of innovative and leading technology, was adopting for coal fired power plant. There is no any water using during the bottom ash processing. A series of operational and environmental problems was eliminated by the air-cooled dry bottom ash handling system. The dry solution of bottom ash avoids the problems and costs associated with waste water in ash handling, improving the performance and the efficiency of the boiler. It is an important contribution to the achievement of “zero waste water discharge” commitment of many utilities, as well as a drastic cost reduction comparing traditional wet system for bottom ash handling process in coal fired power plants.