TAILIEUCHUNG - Air Pollution Control Systems for Boiler and Incinerators Part 8

Tham khảo tài liệu 'air pollution control systems for boiler and incinerators part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TABLE 9-2 PROPERTIES OF FIBERS FOR HIGH TEMPERATURE DRY FILTRATION Generic Name Aramid Glass PTFE Polyphenylene Sulfide Polybenzl-Midazole Metal Ceramic Fiber Trade Name Nomex Fiberglas Teflon Ryton PBI Bekinox Nextel 312 Recommended continuous operation temperature dry heat 400 F 500 F 500 F 385 F 500 F 850 F 2 100 F Water vapor saturated condition moist heat 350 F 500 F 500 F 375 F 500 F 750 F 2 199 F Maximum short time operation temperature dry heat 450 F 550 F 550 F 450 F 650 F 950 F 2 600 F Specific density 1738 Relative moisture regain In at 68 F and 65 relative moisture 0 0 14 0 0 Supports combustion No No No No No No No Biological resistance bacteria mildew No Effect No Effect No Effect No Effect No Effect No Effect No Effect Resistance to alkalles Good Fair lent Excellent Good Good Good Resistance to mineral acids Fair Very Good Excellent Excellent Excellent Very Good Very Good Resistance to organic acids Fair Very Good Excellent Excellent Excellent Very Good Very Good Resistance to oxidizing agents Poor Excellent Excellent attacked by strong oxidizing agents. Fair Very Good Excellent Resistance to organic solvents Very Good Very Good Excellent Excellent Excellent Very Good Excellent u. s. Army Corps of Engineers 0 CD TM 5-815-1 AFR 19-6 TM 5-815-1 AFR 19-6 bags longer than 10 to 12 feet should be provided with walkways at the upper and lower bag attachment levels. b. Hopper and disposal equipment. The dust-collection hopper of a baghouse can be constructed of the same material as the external housing. In small light duty hoppers 16 gage metal is typical. However metal wall thicknesses should be increased for larger baghouses and hopper dust weight. The walls of the hopper must be insulated and should have heaters if condensation might occur. The hopper sides should be sloped a minimum of 57 degrees to allow dust to flow freely. To prevent bridging of certain dusts a greater hopper angle is needed but continuous removal .

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