Seong Cheon Kim - Academia.edu (original) (raw)

Papers by Seong Cheon Kim

The important factor for the development of burner is the achievement of low emissions with maint... more The important factor for the development of burner is the achievement of low emissions with maintaining combustibility. In case of maintaining high temperature flame and excess air to increase the combustibility, it is possible to achieve high combustion efficiency, due to the reduction of UHC(unborn hydrocarbon), carbon monoxide and soot. However, it is difficult to reduce the thermal NOx produced in the high temperature flame. To solve this problem, we developed externally oscillated oil burner which is possible for the high efficiency combustion and low NOx emission, simultaneously. The experiment of flame characteristics and NOx reduction were achieved according to the variation of frequency, amplitude and air velocity. Frequency, amplitude and air velocity are the most important parameter. The optimum operating conditions are frequency 1,900 Hz, amplitude 3 and air velocity 6.8 m/s. Reduction of NOx and CO are 47% and 22%, respectively.

Journal of Korean Society of Environmental Engineers, 2014

In this research, polysulfone hollow fiber membrane was used to recover CO2 which is one of green... more In this research, polysulfone hollow fiber membrane was used to recover CO2 which is one of greenhouse gases from flue gas stream being emitted after the combustion of fossil fuels. The prerequisite requirement is to design the membrane process producing high-purity CO2 from flue gas. For separation of CO2, a membrane module and flue gas containing 10% carbon dioxide was used. The effects of operating conditions such as pressure, temperature, feed gas composition and multi-stage membrane on separation performance were examined at various stage cuts. Higher operating pressure and temperature increased carbon dioxide concentration and recovery ratio in permeate. Recovery ratio and separation efficiency increased if a higher content of CO2 injection gas composition. Three-stage membrane system was producing a 95% CO2 with 90% recovery from flue gas. The separation efficiency of three-stage membrane system was higher than one-stage system.

The purpose of this paper is to investigate the optimal condition of the Syngas production by ref... more The purpose of this paper is to investigate the optimal condition of the Syngas production by reforming of fuel using plasmatron. Plasma was generated by air and arc discharge. The effects of applied steam, or Ni-catalyst on fuel conversion, as well as hydrogen yield and /CO ratio were studied. When the variations of /fuel ratio, /fuel flow ratio and /fuel flow ratio were , and , respectively. Under the condition mentioned above, result of /fuel flow ratio was maximum concentration, or , and result of /fuel flow ratio with catalyst was minimum CO concentration or . and /CO ratio were .

SAE Technical Paper Series, 2007

Renewable Energy, 2008

The purpose of this paper is to investigate the characteristics and optimum operating conditions ... more The purpose of this paper is to investigate the characteristics and optimum operating conditions of the plasmatron-assisted CH 4 reforming reaction for the hydrogen-rich gas production. In order to increase the hydrogen production and the methane conversion rate, parametric screening study was conducted at various CH 4 flow ratio and steam flow ratio and with and without adding catalyst in the reactor. High-temperature plasma flame was made with air and arc discharge, and the air flow rate and the input power were set to 5.1 L/min and 6.4 kW, respectively. When the steam flow ratio was 30.2%, the hydrogen production was maximized and the optimal methane conversion rate was 99.7%. Under these optimal conditions, the following syngas concentrations were determined: H 2 , 50.4%; CO, 5.7%; CO 2 , 13.8%; and C 2 H 2 , 1.1%. H 2 /CO ratio was 9.7 and the hydrogen yield was 93.7%.

International Journal of Energy Research, 2008

ABSTRACT A reformer using low-temperature plasma was designed and developed for hydrogen producti... more ABSTRACT A reformer using low-temperature plasma was designed and developed for hydrogen production. The reformer has three electrodes and uses AC gliding arc discharge. A reference condition, which is the highest hydrogen production, has a O2/C ratio of 0.45, input flow rate of 4.9 l min−1 and power supply of 1 kW. And the methane conversion rate, the high hydrogen selectivity and the reformer efficiency were 69.2, 77.8 and 35.2%, respectively. To investigate reforming characteristics, parametric studies were achieved for the gas components ratio, a gas flow rate, a reactor temperature, an input electric power and catalyst addition effect. The results are as follows: The gas components ratio was an important factor, which had maximum value. When the gas flow rate, the reactor temperature and the electric power were increased, the methane conversion rate and the hydrogen concentration also increased. Copyright

Journal of Korean Society of Environmental Engineers, 2008

Low temperature plasma applied with partial oxidation is a technique to produce synthesis gas fro... more Low temperature plasma applied with partial oxidation is a technique to produce synthesis gas from methane. Low temperature plasma reformer has superior miniaturization and start-up characteristics to reformers using steam reforming or CO2 reforming. In this research, a low temperature plasma reformer using GlidArc discharge was proposed. Reforming characteristics for each of the following variables were studied: gas components ratio (O2/CH4), the amount of steam, comparison of reaction on nickle and iron catalysts and the amount of CO2. The optimum conditions for hydrogen production from methane was found. The maximum Hydrogen concentration of 41.1% was obtained under the following in this condition: O2/C ratio of 0.64, total gas flow of 14.2 L/min, catalyst reactor temperature of 672°C, the amount of steam was 0.8, reformer energy density of 1.1 kJ/L with Ni catalyst in the catalyst reactor. At this point, the methane conversion rate, hydrogen selectivity and reformer thermal effi...

Recycling of various wastes such as sewage sludge requires the energy conversion process like the... more Recycling of various wastes such as sewage sludge requires the energy conversion process like thermal pyrolysis/gasification process. During the process, tar and syngas produce, but the tar brings trouble in pipelines and creates operating problem to the facility. In this study, to investigate naphthalene destruction in a gliding arc plasma reformer parametric experiments were achieved in the variables that can affect on destruction efficiency. And through the parametric studies, the optimal operating conditions and the results were taken. For the parametric studies, steam input amount (steam/carbon ratio), input discharged power SEI (specific energy input), total feed gas amount, and input naphthalene concentration and electrode length were selected for experiments. Optimal conditions were 5.2 of S/C ratio, 0.11 kWh/m of SEI, 26.5 L/min of total gas amount, and 0.4 g/Nm of input naphthalene concentration, and 95 mm of electrode length. The corresponding maximum destruction efficien...

The purpose of this study is to investigate the optimal condition for the hydrogen-rich gas produ... more The purpose of this study is to investigate the optimal condition for the hydrogen-rich gas production and the CO removal by reforming of gliding arc plasma reforming system using biogas. The parametric screening studies were carried out according to changes of steam feed amount, catalyst bed temperature in water gas reactor and catalyst bed temperature, input air flow rate in preferential oxidation reactor. The standard condition is as follows. The steam/carbon ratio, catalyst bed temperature, total gas flow rate, input electric power and biogas composition rate ( : ) were fixed 3, 700, 16 L/min, 2.4 kW and 6 : 4, respectively. The results are as follow, HTS optimum operating conditions were S/C ratio of 3 and reactor temperature of 500. LTS were S/C ratio of 2.9 and temperature of 300. Also, PROX I optimum conditions were input air flow rate of 300 mL/min and reactor temperature of 190. PROX II were 200 mL/min and 190 respectively. After having passed through each reactor, the res...

Transactions of the Korean Society of Mechanical Engineers B, 2007

Journal of Korea Society of Waste Management, 2015

Journal of Korean Society for Atmospheric Environment, 2008

Journal of Korean Society for Atmospheric Environment, 2014

CO 2 emission has been gradually increased due to rising fossil fuel use. A gliding arc plasma sc... more CO 2 emission has been gradually increased due to rising fossil fuel use. A gliding arc plasma scrubber (GAPS) was proposed to destruct CO 2. For optimum design of GAPS, a CFD analysis has been conducted in different configuration for the system. The parameters considered included gas injection velocity at the nozzle and gas flow rate to gap between electrodes. The reactor configuration affected velocity fields which caused changes in the mixture fraction and the retention time. The mixing effect of CO 2 and supplied gas (CH 4 and steam) was enhanced by installing a orifice baffle. This revealed that the orifice baffle is effective in CO 2 conversion by positioning the reactants in the gas into the center of plasma discharge.

To decompose carbon dioxide, which is a representative greenhouse gas, a plasma torch was designe... more To decompose carbon dioxide, which is a representative greenhouse gas, a plasma torch was designed and manufactured. To examine the characteristics of carbon dioxide decomposition via plasma discharge, a case wherein pure carbon dioxide was supplied and a case wherein methane and/or were injected as additives were investigated and compared. The carbon dioxide and methane conversion rate, energy decomposition efficiency, produced gas concentration, carbon monoxide and hydrogen selectivity, carbon-black and were also investigated. The maximum carbon dioxide conversion rate was 28.9% when pure carbon dioxide was supplied; 44.6% when was injected as am additive; and 100% percent when methane was injected as an additive. Therefore, this could be explained that the methane injection showed the highest carbon dioxide decomposition. Furthermore, the carbon-black and were compared with each commercial materials through XRD and SEM. It was found that the carbon-black that was produced in this...

Environmental Technology, 2014

A gliding arc plasma reactor was designed to destruct carbon dioxide (CO₂), which is a major gree... more A gliding arc plasma reactor was designed to destruct carbon dioxide (CO₂), which is a major greenhouse gas. To increase the CO₂destruction rate with a high processing gas volume, an orifice baffle for gathering the gas flow at the centre of the electrodes was installed in the gliding arc plasma reactor. The CO₂inflows with methane (CH₄) and steam (H₂O) improve the CO₂destruction. The parametric studies have been made of the change of CH4 addition, gas injection velocity of the centre nozzle, change of CO₂gas flow rate, and orifice baffle configuration. The produced gases were measured, and the data analysis has been achieved in determining the CO₂destruction rate, CH₄conversion rate, destruction energy efficiency, and selectivity for CO₂and H₂. The highest CO₂ destruction rate for each parameter has been shown as follows: the CH₄/CO₂ratio is 1 as 40%, and the injection gas velocity is 69.5 m/s as 35.7%, the CO₂flow rate is 5 L/min as 42.6%, and the orifice baffle is Type 1, which had the smallest internal area, as 35.7%.

Plasma Chemistry and Plasma Processing, 2013

ABSTRACT To decompose carbon dioxide, which is a representative greenhouse gas, a 3-phase gliding... more ABSTRACT To decompose carbon dioxide, which is a representative greenhouse gas, a 3-phase gliding arc plasmatron device was designed and manufactured to examine the decomposition of CO2, either alone or in the presence of methane with and without water vapour. The changes in the amount of carbon dioxide feed rate, the methane to carbon dioxide ratio, the steam to carbon dioxide ratio, and the methane to steam ratio were used as the parameters. The carbon dioxide conversion rate, energy decomposition efficiency (EDE), carbon monoxide and hydrogen selectivity, and produced gas concentration were also investigated. The maximum values of the carbon dioxide conversion rate, which is a key indicator of carbon dioxide decomposition, in different cases were compared. The maximum carbon dioxide conversion rate was 12.3 % when pure carbon dioxide was supplied; 34.5 % when methane was injected as a reforming additive; 7.8 % when steam was injected as a reforming additive; and 43 % when methane and steam were injected together. Therefore, this could be explained that the methane-and-steam injection showed the highest carbon dioxide decomposition, showing low EDE as 0.01 L/min W. Furthermore, the plasma produced carbon-black was compared with commercial carbon-black chemicals through Raman spectroscopy, surface area measurement and scanning electron microscopy. It was found that the carbon-black that was produced in this study has the high conductivity and large specific surface area. Our product makes it suitable for special electric materials and secondary battery materials applications.