| OCR Text |
Show using a Porapak QS column and flame ionization detector. Aromatic compounds were detected and quantified using a Megabore 624 column and a photoionization detector. Halogenated compounds were detected and quantified using a Carbopack 624 co 1 umn and a Hall detector. The GC techni ques provi ded i ntermittent, instantaneous values at selected times. DISCUSSION OF RESULTS Process Data and Waste Characteristics Key process data for each run are presented in Table 2. The process data shown cons i sts of k i 1 n and secondary combust i on chamber temperatures, percent O2 , stack flow rate, natura 1 gas heat input, and tota 1 heat input. The total heat input is the sum of heat input from the natural gas and waste feed. Ranges for selected process data are shown in parentheses. Runs 1 through 3 were conducted under steady state operating condit ions. However, runs 4 through 6 were altered so that the inc i nerator operated with a transient combustion upset. Several techniques were attempted to accomplish this transient condition by causing a sudden increase in the feed of volatile waste to the incinerator. Attempts with waste fed to the rotary kiln, spiking 10 gallons (gal.) of volatile hydrocarbons in drums of solid waste or suddenly increasing the liquid waste feed, failed to produce a transi ent cond i t ion. The CO 1 eve 1 did not change. A sudden increase in 1 i qu i d organic waste feed to the secondary chamber did produce sharp increases in CO and THC levels, and that technique was chosen to cause the transient condition. The liquid organic waste feed rate to the secondary combustion chamber was suddenly increased from a normal 2 gallons per minute (gal/min) to 6 gal/min for approximately 7 seconds (sec) and then returned to the original setting. This fluctuation in the liquid organic waste feedrate occurred 15 min into the run and approximately every 30 min throughout the run. A review of the data in Table 2 shows that the transient conditions did not cause any major change in the process parameters shown on the table. Tab 1 e 3 presents the average waste characteri st i cs for the steady state and trans i ent test runs. The characteri st i cs compared are feedrates, heat i ng va 1 ues, percent ch 1 ori ne, and percent ash. The waste characeri st i cs did not change significantly between the two sets of test runs. Carbon Monoxide (CO) and Total Hydrocarbon (THC) Emissions One way to characteri ze the operati on of the i nci nerator under steady state and transient conditions is with the CO and THC levels. Table 4 presents average CO levels and ranges of CO for each run. CO levels for the steady state conditions (runs 1 through 3) averaged near zero while the average for the transient conditions (runs 4 through 6) ranged from 10 to 15 parts 3 |
