Kramlich, JC
1988-1987
Fundamentals of Hazardous Solid Waste Incineration in a Rotary Kiln Environment
Lighty, J.S.; Silcox, G.D.; Britt, R.; Owens, W.D.; Pershing, D.W. and Cundy, V.A.
Proc. AFRC Int'l. Symposium on Waste Incineration, 1987, Palm Springs. Funded by Environmental Protection Agency.
With landfill costs increasing and regulations on landfilling becoming more stringent, alternatives to conventional hazardous waste treatment strategies are becoming more desirable. Incineration is presently a permanent, proven solution for the disposal of most organic contaminants, but also a costly one, especially in the case of solids that require some auxiliary fuel. The goal of this research is to develop an understanding of the phenomena associated with the evolution of contaminants from solids in the primary combustor of an incineration system. A threefold approach has been used. First, a bench-scale Particle Characterization Reactor was developed to study the transport phenomena on a particle basis, where the controlling processes are mainly intraparticle. Second, a Bed Characterization Reactor was built to examine the controlling transport phenomena within a bed of particles, where the processes are primarily interparticle. The results of these studies can be applied to any primary combustor. Finally a pilot-scale rotary kiln was developed to study the evolution of contaminants from solids within a realistic temperature and rotation environment.
This paper describes results obtained in a study using a commercial sorbent contaminated with toluene. The data are from the Particle Characterization Reactor and the Rotary-Kiln Simulator. The results show that the method of contamination and charge size does not have a large effect on desorption, while temperature and contaminant concentration are important parameters in the evolution of contaminants in a rotary kiln. Preliminary modeling efforts for the kiln are also discussed.
A Mathematical Model for the Flash Calcination of Dispersed CaCO3 and Ca(OH)2 Particles
Silcox, G.D.; Kramlich, J.C. and Pershing, D.W.
Submitted to I&EC/Research, 1987. 28 pgs. Funded by ACERC (National Science Foundation and Associates and Affiliates).
A mathematical model for the flash calcination of Ca(OH)2 and CaCO3 is presented. The model describes the decomposition of the parent material at the reactant-product interface, the diffusion of CO2 or H2O through the growing CaO layer, and the sintering of the CaO layer. The model is qualitative, but it provides useful estimates of peak CO2 pressures in the CaO layer, relative rates of surface area development and loss for Ca(OH)2 and CaCO3, the effect of particle size, and the effects of time and temperature.
Kramlich, JC
1988-1987
Fundamentals of Hazardous Solid Waste Incineration in a Rotary Kiln Environment
Lighty, J.S.; Silcox, G.D.; Britt, R.; Owens, W.D.; Pershing, D.W. and Cundy, V.A.
Proc. AFRC Int'l. Symposium on Waste Incineration, 1987, Palm Springs. Funded by Environmental Protection Agency.
With landfill costs increasing and regulations on landfilling becoming more stringent, alternatives to conventional hazardous waste treatment strategies are becoming more desirable. Incineration is presently a permanent, proven solution for the disposal of most organic contaminants, but also a costly one, especially in the case of solids that require some auxiliary fuel. The goal of this research is to develop an understanding of the phenomena associated with the evolution of contaminants from solids in the primary combustor of an incineration system. A threefold approach has been used. First, a bench-scale Particle Characterization Reactor was developed to study the transport phenomena on a particle basis, where the controlling processes are mainly intraparticle. Second, a Bed Characterization Reactor was built to examine the controlling transport phenomena within a bed of particles, where the processes are primarily interparticle. The results of these studies can be applied to any primary combustor. Finally a pilot-scale rotary kiln was developed to study the evolution of contaminants from solids within a realistic temperature and rotation environment.
This paper describes results obtained in a study using a commercial sorbent contaminated with toluene. The data are from the Particle Characterization Reactor and the Rotary-Kiln Simulator. The results show that the method of contamination and charge size does not have a large effect on desorption, while temperature and contaminant concentration are important parameters in the evolution of contaminants in a rotary kiln. Preliminary modeling efforts for the kiln are also discussed.
A Mathematical Model for the Flash Calcination of Dispersed CaCO3 and Ca(OH)2 Particles
Silcox, G.D.; Kramlich, J.C. and Pershing, D.W.
Submitted to I&EC/Research, 1987. 28 pgs. Funded by ACERC (National Science Foundation and Associates and Affiliates).
A mathematical model for the flash calcination of Ca(OH)2 and CaCO3 is presented. The model describes the decomposition of the parent material at the reactant-product interface, the diffusion of CO2 or H2O through the growing CaO layer, and the sintering of the CaO layer. The model is qualitative, but it provides useful estimates of peak CO2 pressures in the CaO layer, relative rates of surface area development and loss for Ca(OH)2 and CaCO3, the effect of particle size, and the effects of time and temperature.