Numerical Modeling of the Temperature Distribution in a Commercial Hazardous Waste Slagging Rotary Kiln

Abstract

The gas, wall, and bed temperatures in a hazardous waste incineration kiln were studied using a commercially available, CFD-based, reacting flow code, which included radiation heat transfer. The model was compared to field measurements made on a co-current flow, 35 MW slagging rotary kiln. Cases were run to determine the sensitivity of the predictions to changes in the model assumptions and to simulate the normal variation in combustion inputs. The model predictions of the peak bed temperature, of the axial temperature profile, and of the gas temperature at the exit-plane were consistent with the measurements at a fullscale waste incinerator during normal operation. The model and the field observations both indicate that the peak bed temperature occurs near the middle of the kiln and that the difference between the peak bed temperature and the exit-plane gas temperature depends on the inlet flows. The geometry of the transition between the kiln and the secondary combustion chamber and the fuel-to-air equivalence ratio have the greatest effect on the calculated temperature distribution. Modeling studies provide useful information such as the relationship between available measurements and the temperature at inaccessible locations inside a full-scale kiln.

Pyrolytic Treatment and Fertility Enhancement of Soils Contaminated with Heavy Hydrocarbons

“…Pyrolysis was performed in a stainless-steel 0.5 L fixed-bed reactor heated by a split-hinge tube furnace (Thermo Scientific Lindberg/Blue M) under continuous N 2 flow (1 L/min). Thermocouples recorded the temperatures on the outer surface of the reactor as well as in the center of the soil chamber of the reactor to monitor the temperature distribution and ensure the desired pyrolysis temperatures were reached through the reactor. , Volatiles and moisture exited through the reactor outlet into a trap flask, and gases were vented into a fume hood (Figure S1).…”

Energy conservation and heat transfer enhancement for mixed convection on the vertical galvanizing furnace

“…Numerical simulations can reveal the distribution of flow and temperature field in the furnace and has been widely used in the design and research of industrial furnaces. El-Kaddah [4] established 3-D flow and temperature distribution characteristics of induction heating in a steel sheet rolled process based on the numerical simulations, and Veranth [5] acquired the temperature distribution of a rotary kiln in the treatment of industrial waste residue. Mastorakos [6] established the mathematical model of cement kiln and performed numerical calculations on the combustion and heat transfer in the pits.…”

CFD simulations of rotary BOF slag carbonation kiln reactor with cyclone flow

“…Consequently, in examining the flow field within the reactor, and in particular, in devising methods to prolong the residence time of the CO 2 gas, computational fluid dynamics (CFD) simulations are generally preferred to experimental methods. Veranth et al 9 performed CFD simulations to examine the flow field in a commercial hazardous waste slagging rotary kiln with a 35 MW power output. Yang and Farouk 10 used a solid particle flow model to simulate the flow conditions and heat transfer in a rotary kiln calciner.…”