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Air Pollution Control Systems for Boiler and Incinerators Part 2

Tham khảo tài liệu 'air pollution control systems for boiler and incinerators part 2', 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 2-4 EMISSION FACTORS FOR SEWAGE SLUDGE INCINERATORS Emissions Uncontrolled _Pollutant__ __lb ton Particulate 100 Sulfur dioxide 1 Carbon monoxide Neg Nitrogen oxides as NO2 6 Hydrocarbons 1 5 Hydrogen chloride gas 1 5 Unit weights in terms of dried sludge. From Environmental Protection Agency Compilation of Air Emission Factors . such factors as incinerator design refuse type incinerator capacity method of feeding and method of operation. Improved incinerator performance reduces both dust loading and mean particle size. 1 Incinerator capacity. Large incinerators burn refuse at higher rates creating more turbulent gas flow conditions at the grate surface. Rapid turbulent combustion aided by the use of more underfire air causes particle suspension and carry over from the incinerator grate surface resulting in higher emission rates for large incinerators. 2 Underfire air flow. The effect of increasing underfire grate air flow is to increase particulate emission rate. 3 Excess air Excess air is used to control combustion efficiency and furnace temperatures. Incinerators are operated at levels of excess air from 50 percent to 400 percent. However particulate emission levels increase with the amount of excess air employed. Increases in excess air create high combustion gas velocities and particle carry over. Excess air is important as a furnace temperature control because incomplete combustion will occur at furnace temperatures below 1400 degrees Fahrenheit and ash slagging at the grate surface and increased NOX emissions will occur above furnace temperatures of 1900 degrees Fahrenheit. 4 Opacity. For information on the use of visible opacity measurement as an aid to achieving efficient combustion see paragraph 3-8. b. Data reduction. The state regulations for particulate emissions are expressed in a variety of units. The following techniques permit the user to reduce particulate test data to grains per dry standard cubic