| OCR Text |
Show mass emitted in the transient puff. Weighed desiccated quartz filters and the heated particulate filter system upstream of the THC analyzer were used to collect particulate samples. Volatile hydrocarbons are defined as those in the gas-phase at 420 K (300 OF), the temperature of the heated sample line. Charges to the kiln were kept constant for all tests presented in this paper. Only the natural gas, air, and oxygen flows to the prototype burner were varied by test design to cause changes in the oxygen flow, partial pressure, and stoichiometric ratio. Charges to the kiln consisted of 100 g (0.22 lb) of toluene on 135 g (0.30 lb) of ground corncob sorbent sealed in a 45 g (0.10 lb) cylindrical uncoated 1 qt (0.95 1) cardboard container. Similar charges were used in previous work by this group.2 Toluene was chosen because it yields large chlorine-free puffs to which the FlO is very sensitive. Toluene also produces large particulate loadings. A charge mass of 100 g (0.22 lb) was chosen because it provides large puffs which did not greatly exceed the FlO linear response region of zero to 10,000 ppm (reported as methane) for the conditions tested. As with the previous studies, a portion of the experimental design was based on response surface experimentation.3 This methodology allows, on the basis of one experiment involving a minimal number of trials, determination of an empirical relationship between the response and the controlled variables in the experimental region. For the first set of experiments, the flows of oxygen and air were chosen as the controlled or independent variables. The natural gas auxiliary fuel feed rate (kiln load) was held constant. These variables are of intrinsic interest to an incinerator operator because they are directly controlled. By defining these flow rates to the burner, several other system parameters are defined. These calculated variables include; 6 |
