Emissions And Controls
Particulate matter (PM) is the primary air pollutant emitted from cotton ginning. Available data indicate that about 37 percent of the total PM emitted (following control systems) from cotton ginning is PM less than or equal to 10 microns in aerodynamic diameter (PM-10). The PM is composed of fly lint, dust, fine leaves, and other trash. Figure 9.7-1 shows the typical PM emission points in the ginning process. Particulate matter emissions are typically greater at gins processing stripper-harvested cotton than at gins processing picker-harvested cotton. Also, PM emissions from the
first cotton harvest at a given facility are typically lower than emissions from subsequent harvests.
Control devices used to control PM emissions from cotton ginning operations include cyclones, fine screen coverings, and perforated metal drums. Cyclones may be used to control the sources with high pressure exhaust or all of the operations at a gin. Two types of cyclones that are used are 2D-2D and 1D-3D cyclones. Both the body and the cone of a 2D-2D cyclone are twice as long as the cyclone diameter. The body of a 1D-3D cyclone is the same length as the diameter, and the cone length is three times the diameter. In many cases, 1D-3D cyclones display slightly higher PM control efficiencies than 2D-2D cyclones.
Screen coverings and perforated drums may be used to control PM emissions from sources with low-pressure exhaust, including the battery condenser and lint cleaners.
Emissions And Controls
Particulate matter (PM) is the primary air pollutant emitted from cotton ginning. Available data indicate that about 37 percent of the total PM emitted (following control systems) from cotton ginning is PM less than or equal to 10 microns in aerodynamic diameter (PM-10). The PM is composed of fly lint, dust, fine leaves, and other trash. Figure 9.7-1 shows the typical PM emission points in the ginning process. Particulate matter emissions are typically greater at gins processing stripper-harvested cotton than at gins processing picker-harvested cotton. Also, PM emissions from the
first cotton harvest at a given facility are typically lower than emissions from subsequent harvests.
Control devices used to control PM emissions from cotton ginning operations include cyclones, fine screen coverings, and perforated metal drums. Cyclones may be used to control the sources with high pressure exhaust or all of the operations at a gin. Two types of cyclones that are used are 2D-2D and 1D-3D cyclones. Both the body and the cone of a 2D-2D cyclone are twice as long as the cyclone diameter. The body of a 1D-3D cyclone is the same length as the diameter, and the cone length is three times the diameter. In many cases, 1D-3D cyclones display slightly higher PM control efficiencies than 2D-2D cyclones.
Screen coverings and perforated drums may be used to control PM emissions from sources with low-pressure exhaust, including the battery condenser and lint cleaners.
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