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Dust Control

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Published in: EVS
6,129 Views

Dust Control System

Arup S / Howrah

7 years of teaching experience

Qualification: B.E from BESU, Shibpur

Teaches: Chemistry, Mathematics, Physics

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  1. DUST CONTROL SYSTEM
  2. Problems in Existing Dust Control System Low cleaning efficiency Higher dust emission from stack Ducts get frequently choked Inadequate suction at the hoods Puffing taking place at suction points Work zone is dusty Dust deposited on floor of work place Loss of precious material Adverse effects on workers' health Breakdowns and repetitive problems for long duration
  3. Basics of Industrial Ventilation Industrial ventilation is a method of controlling worker exposure to airborne toxic chemicals or flammable vapors by exhausting contaminated air away from the work area and replacing it with clean air. Local exhaust ventilation is used in industries to capture dusts. Components Hood Ductwork Air cleaning device Fan Stack
  4. Selection criteria for appropriate dust collection equipment Following factors are considered Contaminant concentration Gas stream characteristics Contaminant characteristics Energy consideration Dust disposal Efficiency required Comparing all the factors for various dust collectors, bag filter was selected for the proposed dust extraction system.
  5. Design of Bag Filter Based Dust Extraction System Dust is generated in work zone area during material transfer by conveyor belt. As compared to the present dust control system, a better and more efficient dust extraction system is designed for conveyor belt ventilation. Changes made Review of suction air quantity based on ACGIH norms Designing a number of suction hoods and their location Designing a bag house filter Designing a stack of suitable height
  6. Design Philosophy Several empirical formulae are available for calculations and design. Amongst them, the design guidelines and criteria given by the American Conference of Governmental Industrial Hygienists (ACGIH@) in "Industrial Ventilation - A Manual of Recommended Practice" are most widely followed by engineers to design local ventilation systems. The ACGIH ventilation manual contains dozens of design plates of ventilation systems for specific industrial applications that have been used to control emissions. The next slide is the ACGIH design plate for conveyor belt ventilation.
  7. Conclusion and Recommendations RECOMMENDATIONS In addition to the more efficient de-dusting system designed for air pollution control in work zone, the following steps are recommended to be brought into practice in the Lime Shop as routine job. Provision should be made to spray water on the feeders before charging the raw material into shaft kilns in Lime Shop. This would ultimately result in less dust generation, healthy environment for the workers and stack emissions inside the norms. Stationary and mobile super suckers or industrial vacuum cleaners 2. should be utilized regularly as per requirements in various areas and floors for better housekeeping. In house training program on pollution control systems at the Shop 3. and feedback clarification should be done for the workers. Scheduled and routine maintenance of the pollution control 4. systems should be carried out. Handling of lime, a sticky and hygroscopic material, is an 5. operationally difficult task. Special moisture repellant polypropylene filter bags can be used.
  8. Conclusion and Recommendations 6. Hopper heaters, zero speed switches, level switches and DP switches which ensure the smooth and trouble free operation of the system can be used. 7. Dust masks meeting the NIOSH N95 rating should be made compulsory for workers. 8. Full clothing to cover arms and legs, gloves, safety glasses or face shield should be provided to workers handling lime. 9. Eye wash and shower station should be readily available. 10. Offline cleaning should be preferred as high level particulate emission takes place during on-line cleaning process.
  9. THANKS

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