OCR Text |
Show however, the primary limiting factor to sustaining a constant feed rate of over 3,000 lb/hr was the heat stress of the feed crew (outfitted in protective clothing and respiratory protection). The quench system was the limiting element for high chlorine feeds. No more than 200 lb/hr of chlorine in feed materials could be fed without causing automatic system shutdowns due to a high degree of effervescence in the quench sump (resulting in quench pump cavitation and quench interruption). Tests were also performed on vermiculite and two brominated waste mixes containing different fractions of brominated sludge, soil, and sodium sulfate salt cake. A feed rate of 4000 lb/hr was demonstrated for a mixture containing 27% sludge and a feed rate of 3000 lb/hr was demonstrated for a mixture containing 42% sludge. Both wastes contained only 1% of salt cake. U~ to 800 lb/hr of the very low density vermiculite (4 lb/ft ) was successfully processed. Other feeds had limited feed rates as follows: Wet soil mixed with plastics: Only 1000 to 2000 lb/hr of this mixture could be processed. There were significant quantities of this wet soil which was brought in by truck. Large amounts of plastics came from the liners which protected the trucks from contamination with dioxin. Also, moderate kiln slagging reduced equipment availability with this material. Trash: Feed rates of 200 to 700 lb/hr were feasible as limited by kiln slagging. this material consists of plasting clothing, rubber gloves, and boots, wooden pallets, glass, paper, insulation, etc. Metal drums: The system was able to process 10 to 12 drums per hour. Since other feed can be process simultaneously, drums do not limit total feed rate. Particulate Tests In preparation for the planned RCRA/TSCA trial burn, particulate tests were also conducted with simultaneous feeding of 4,000 lb/hr of soil and 200 lb/hr of CC1 4 . The results clearly showed that particulate emissions depended directly on the amount of chlorine fed to the system as shown in Figure 3. A number of simple system changes were tried without any success. The high particulate emissions were traced to the fact that large amount of mist with dissolved sodium chloride was entrained in the stack gas. The sodium chloride showed up with the particulates on the test filters. The problem was solved by installing a mist eliminator in the last stages of the MX scrubber. High chlorine feed tests were extremely successful after demister installation. |