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Air Pollution Control Systems for Boiler and Incinerators Part 3

Tham khảo tài liệu 'air pollution control systems for boiler and incinerators part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TM 5-815-1 AFR 19-6 TABLE 3-6 EMISSION FACTORS FOR BARK AND WOOD WASTE COMBUSTION IN BOILERS Pollutant Emissions . lb ton Particulates a Bark b With fly-ash reinjection c 75 Without fly-ash reinjection Wood bark mixture b 50 With fly-ash reinjection c 45 Without fly-ash reinjection 30 Wood d 5-15 Sulfur oxides SO2 e 1.5 Carbon monoxide f 2-60 Hydrocarbons 2-70 Nitrogen oxides NO2 10 a. These emission factors were determined for boilers burning gas or oil as an auxiliary fuel and it was assumed all particulates resulted from the waste fuel alone. When coal Is burned as an auxiliary fuel the appropriate emission factor from Table 3-3 should be used In addition to the above factor. b. These factors based on an as-fired moisture content of 50 percent. c. This factor represents a typical dust loading reaching the control equipment for boilers employing fly-ash reinjection. d This waste Includes clean dry 5 to 50 percent moisture sawdust shavings ends etc. and no bark. For well designed and operated boilers use lower value and higher values for others. This factor Is expressed on an as-fired moisture content basis assuming no fly-ash reinjection. This factor is calculated by material balance assuming a maximum sulfur content of 0.1 percent in the waste. When auxiliary fuels are burned the appropriate factors from Tables 3-3 3-4 and 3-5 should be used in addition to determine sulfur oxide emissions. f. Use lower values for well designed and operated boilers. From Environmental Protection Agency Compilation of Air Emission Factors 3-8 TM 5-815-1 AFR 19-6 TABLE 3-7 FACTORS AFFECTING NO EMISSIONS X Variable Increasing Heat release rate Heat quenching rate water cooled furnaces Boiler capacity Boiler load Excess air Furnace temperature Combustion air temperature Fuel nitrogen content Fuel oxygen content Fuel moisture content Distance between burners Number of burners per unit Fuel air mixing turbulence Time available for particle bu tangentially fired boilers u. s. Army Corps