Enhanced particulate collection from Indian coal fired power plants
- Environmental and Energy Consultants Associates, IL (United States)
- National Thermal Power Corp., Delhi (India)
The problem of particulate emission control from PC fired Indian power plants is exacerbated by the coal characteristics -- high ash and moisture and low sulphur, sodium and heating value. These lead to high carbon in ash, higher back end temperature and gas flows than those in other parts of the world. In the absence of bag filters in the power industry, the ESP has been the only means of particulate control, in spite of the significantly large specific collection area required for compliance of 150 mg/Nm{sup 3} (50 mg/Nm{sup 3} per World Bank). Although new plants are being designed to this value, the existing plants, even when in satisfactory electro-mechanical condition, face difficulty in meeting compliance. The paper reviews the factors relating to high emissions and presents various scenarios for their reduction by: (a) plant size increase, (b) flyash conditioning, (c) reduction in back end temperature to reduce gas flow and particle resistivity and (d) alternative methods of energization, e.g., pulse charging, intermittent energization and high frequency derived DC. The method of enhancement is site specific and depends on the problem faced by the specific plant. The impact of improved combustion on ESP performance is also reviewed and finally the use of bag filters is considered as a cost effective solution. The improvement methods detailed in the paper should benefit the current nation-wide ESP upgrading projects and IPPs considering new plant.
- OSTI ID:
- 318923
- Report Number(s):
- CONF-980426-; TRN: IM9909%%120
- Resource Relation:
- Conference: American power conference, Chicago, IL (United States), 14-16 Apr 1998; Other Information: PBD: 1998; Related Information: Is Part Of Proceedings of the American Power Conference: Volume 60-1; McBride, A.E. [ed.] [Illinois Inst. of Tech., Chicago, IL (United States)]; PB: 613 p.
- Country of Publication:
- United States
- Language:
- English
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