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Gaseous exhausts from various industries pollute the environment with fly-ash generally filtered by electrostatic precipitators (ESPs) before being released to the atmosphere. This paper presents the development of a controller for ESP power supply. The controller maintains the voltage applied to ESP at its maximum average value by duty cycle control that results in an improvement in dust collection-efficiency. The limiting factor for the output voltage is the breakdown of gas (spark/arc) in the electrode gap of ESP. During a spark/arc condition, the duty cycle limit imposed by the controller causes a reduction in output voltage that leads to the prevention of spark/arc. The present design has a response faster than line frequency power supply controllers. The control circuit is simpler, easy to implement and uses a standard PWM controller IC. The design of power stage uses a flyback current-fed push-pull DC-DC converter with multiple secondary circuits, which has the advantages of instantaneous current limit and less voltage stress on rectifier-diodes. Simulation is performed to obtain a 1 kV, 100 W output from a 24VDC source. The results are compared with experimental values to validate the controller’s ability to achieve good load regulation during normal operation and a reduction in output voltage during spark/arc condition.

Prototypes of two different short-resistant electrostatic precipitator collecting cells have been designed, fabricated and tested. Both designs can meet all the performance requirements of MIL-F-22963B and can be retrofitted in presently installed modular electrostatic precipitators. Both designs appear capable of prolonged operation under heavy smoke loading conditions to effectively cleanse a submarine atmosphere of smoke from a fire. The prototypes have been delivered to the Naval Research Laboratory for smoke loading tests to evaluate their effectiveness. (Author)

'Repair of Electrostatic Precipitators of NTPC, Farakka (5-Dec-1995)' from the RS Debates Digital Library

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. (For more information: 12 Tables of Code ) Name of Standards Organization: Bureau of Indian Standards (BIS) Division Name: Mechanical Engineering Section Name: Chemical Engineering Plants and Related Equipment (MED 17) Designator of Legally Binding Document: IS 9241 Title of Legally Binding Document: Purchaser's data sheet for electrostatic precipitators Number of Amendments: Equivalence: Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New --Jawaharlal Nehru Invent a new India using knowledge. --Satyanarayan Gangaram Pitroda ATTENTION! This standard, Indian Standard IS 9241:1979, has been declared to be WITHDRAWN is thus no longer active. Superceding standard: .

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. (For more information: 12 Tables of Code ) Name of Standards Organization: Bureau of Indian Standards (BIS) Division Name: Mechanical Engineering Section Name: Chemical Engineering Plants and Related Equipment (MED 17) Designator of Legally Binding Document: IS 10919 Title of Legally Binding Document: Glossary of Terms for Electrostatic Precipitators Number of Amendments: Equivalence: Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New --Jawaharlal Nehru Invent a new India using knowledge. --Satyanarayan Gangaram Pitroda ATTENTION! This standard, Indian Standard IS 10919:1984, has been declared to be WITHDRAWN is thus no longer active. Superceding standard: Decided by council.

The uncertainties and associated costs involved in selecting and designing a particulate control device to meet California's air emission regulations are considered. The basic operating principles of electrostatic precipitators and fabric filters are discussed, and design parameters are identified. The size and resulting cost of the control device as a function of design parameters is illustrated by a case study for an 800 MW coal-fired fired utility boiler burning a typical southwestern subbituminous coal. The cost of selecting an undersized particulate control device is compared with the cost of selecting an oversized device.