The ice-bath compartment contains the system's impingers and bubblers. The system for determining the stack gas moisture content consists of four impingers connected in series as shown in Figure 5.11.1. The first, third, and fourth impingers have the Greenburg-Smith design. The pressure drop is reduced when the tips are removed and replaced with a ]/2-in (12.5 mm) ID glass tube extending to 1/2 in (12.5 mm) from the bottom of the flask. The second im-pinger has the Greenburg-Smith design with a standard tip. During sampling for particulates, the first and second impingers are filled with 100 ml (3.4 oz) of distilled and deionized water. The third impinger is left dry to separate entrained water. The last impinger is filled with 200 to 300 g (7 to 10.5 oz) of precisely weighed silica gel (6 to 16 mesh) that has been dried at 350°F (177°C) for 2 hr to completely remove any remaining water. A thermometer, capable of measuring temperature to within 2°F (1.1°C), is placed at the outlet of the last impinger for monitoring purposes. Adding crushed ice during the run maintains the temperature of the gas leaving the last impinger at 60°F (16°C) or less.
Was this article helpful?