OCR Text |
Show inlet antimony was detected in the afterburner exit flue gas. For the remaining tests with nominally 19 percent chlorine feed and the tests with nominally 8 percent and 0 percent chlorine feed, between 25 and 101 percent of the input antimony was measured in the afterburner exit flue gas. Between 15 and 84 percent of the inlet antimony was measured in the scrubber discharge streams (flue gas plus blowdown). Scrubber blowdown water accounted for 5 to 75 percent of the inlet antimony. Scrubber exit flue gas accounted for between 3 and 21 percent of the inlet antimony. Comparable fractions of antimony were generally measured in these two streams for a given test. Mass balance closure in the afterburner exit flue gas was quite poor for four tests. However, for 4 of 5 tests at the nominally 19 percent chlorine feed, two at nominally 8 percent chlorine feed, the one with no, and the one with about 34 percent chlorine feed, mass balance closure was within a factor ) of 3. This is in the range of acceptable mass balance closure based on past experience. Closure results are generally better at the scrubber discharge. Still, closure within a factor of 3 was obtained for only 7 tests. The inability to attain better mass balance closure in the tests was likely affected by the fact that accumulation of element concentrations in recirculating scrubber liquor was not taken into account. Table 2 shows the distribution of antimony between the particulate and vapor phases in the flue gas at both the afterburner exit and the scrubber exit. The table shows that, at the afterburner exit where temperatures were above 760°C (1,400°F), the vapor phase (impinger samples) contained an I average of 55 percent (range 5 to 90) of the collected antimony. At the scrubber exit where the temperature was generally at 74°C (165°F), the vapor 7 |