Si Wouk Kim

Steam Plasma Reforming of Biogas by Non-Thermal Pulsed Discharge

The purpose of this study was to develop technology that can convert biogas to synthesis gas (SynGas), a low emission substituted energy, using a non-thermal pulsed plasma method. To investigate the characteristics of the SynGas production from simulated biogas, the reforming characteristics were studied about the variations of pulse frequency, biogas component ratio (C3H8/CO2), vapor flow ratio (H2O/TFR), biogas velocity and pulse power. A maximum conversion rate of 49.1% was achieved for the biogas when the above parameters were 500 Hz, 1.5, 0.52, 0.32 m/s and 657 W, respectively. Under the above-mentioned reference conditions, the dry basis concentrations of the SynGas were, H2 64.5%, CH4 8.1%, C2H2 6.7%, C3H6 4.9%, CO 0.8% and C2H4 0.4%. The ratio of hydrogen to the other intermediates in the SynGas (H2/TTMs) was 3.1.

Numerical and experimental studies of CCl4 destruction in a dump incinerator

Abstract We undertook numerical and experimental studies to develop a better incineration method for the destruction of CCl4. A phenomenological model for the turbulent reaction of CC14, including a flame inhibition feature, has been successfully incorporated into a commercial code, simulating the incineration processes of this compound. The gaseous flow solution was obtained using SIMPLEST, a derivative of Patankars SIMPLE algorithm, with a k‐E turbulence model. A modified fast chemistry turbulent reaction model was developed to describe the flame inhibition due to the presence of CCl4, considering the corresponding burning velocity data of these mixtures. An experiment was carried out on a small‐scale, transportable, dump‐type incinerator, which warrants a sufficient residence time and effective turbulent mixing by the formation of a strong redrculation region in a combustor. To this end, the specific configuration of the incinerator was manufactured to consist of two opposing jets and a rearward facing step. The calculated data were in close agreement with the experimental data for the concentrations of major spedes, such as CCl4 and HCl, together with the temperature profiles. The dump incinerator satisfied the orders required by the EPA of 99.99% (4 nines) DRE for hazardous waste incinerators.