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Hazardous Waste Destruction and Nitric Oxide Reduction with Externally Forced Oscillation
전영남,신대윤 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.4
The research described here focuses on the enhancement of hazardous waste destruction and the reductionin nitric oxide and unburned emissions in a cavity incinerator, which has externaly forced acoustic oscillation. Thespecific configuration of the incinerator was manufactured to consist of two opposing jets and a rearward facing step[Chun, 1999]. The cavity-type incinerator warrants a suficient residence time and effective turbulent mixing by theformation of a strong recirculation region in a combustion cavity. The experiments were carried out about combustioncharacteristics in a 3.2 kW laboratory scale, transportable, cavity incinerator without external oscillation. These showedthat hazardous waste was destructed effectively, but unfortunately NO was increased by high gas temperature. To solvethis problem, we developed an externaly oscilated auxiliary burner embedded on the incinerator furnace. The externaloscilation was effective to reduce NO which is produced at high temperature incineration and to destruct hazardouswaste, simultaneously. Emissions of NO are seen to be decreased by nearly 60%, and DRE (destruction and removalefficiency) is above 99.99%, all with external forcing at a specific optimum conditions.
빌딩주변 자동차 배기가스중의 NOx 분산에 관한 수치해석
전영남,정오진,송형운 한국환경과학회 2004 한국환경과학회지 Vol.13 No.7
This paper demonstrates the numerical simulation of three dimensional flow pattern for vehicular exhaust dispersion in the street canyons. The wind flow around buildings in urban is computed by the SIMPLEST method. The convection-diffusion equation was used to compute the NO_(x) concentration level near buildings. Details are given of important boundary conditions and turbulence quantities variations. The simple turbulence model was used for unisotropic viscous effect. A control-volume based finite-difference method with the upwind scheme is employed for discretization equation. The simple turbulence model applied in this study has been verified through comparison between predicted and measured data near buildings. By the predictive results, the updraft induced by the presence of high-rise buildings is important in the transport of street level pollutant out from the street canyons. Our suggestion for reducing ground level pollution is to have high-rise buildings constructed or to reduce the channelling effect of street canyons.
저공해 스토커형 도시폐기물 소각로 설계를 위한 열유동 수치해석 연구
전영남,송형운,김미환 한국환경과학회 2002 한국환경과학회지 Vol.11 No.6
A Numerical simulation on the thermal flow performance was carried out to propose the incinerator type for the domestic refuses and to investigate the design factor and operating conditions. The SSTI(Standard Stoker Type Incinerator) proposed in this study was modified from the type with central flow. It has the characteristics of good mixing between refuse and hot combustion gas in primary combustion chamber and between unburned gas inflowing and secondary air jet in secondary chamber. By predictive results, the SSTI was no recirculation zone in secondary chamber so that mixing time was increased with high residence time. It has good characteristics of combustion and low emission. Parametric screening studies have been understood with phenomenon of combustion in incinerator.
전영남,임문섭,조대영 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.3
Refuse plastic fuel (RPF) as materials for the recycling processes (Materiel Recycling) present difficulties with the mixing, the demolishing, the molding and the drying steps. While using RDF as a fuel by pyrolysis, accompanying tar and soot causes many problems like clogging, the corrosion and the erosion of the chloride channel. Using the intermittent pyrolysis equipment during the decomposition of the RPF gases H2, CH4, CO and among the by-products of Cl2 and HCl, Tar is produced in a large quantity. With understanding the by-products decomposition system of the Cl2, H2, Tar and the gases H2, CH4, CO we can understand the nature of the generation of the products. The experimental conditions were chosen according to the temperature of the decomposition (300 ~ 900o℃), While varying RPF 2 g, pyrolysis temperature 700℃ during a holding time of 32 min : the H2 gas 1.71%, CH4 2.54%, CO 4.63%, Cl2 12.86 ppm, HCl 30.2 ppm were composed. Also light tar benzene 18.45 g/㎥, naphthalene 0.86 g/㎥, anthracene 0.09 g/㎥, pyrene 0.04 g/ ㎥, gravimetric tar 31.8 g/㎥, and char 0.45 g was formed.