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Environmental Engineering Research 2003;8(5): 243-251. DOI: https://doi.org/10.4491/eer.2003.8.5.243
PYROLYSIS CHARACTERIZATION OF MSWS AT THERMAL DECOMPOSITION CONDITIONS
Jong-In Dong, and Tae-Heun Kim
Department of Environmental Engineering, University of Seoul, Korea
Corresponding Author: Jong-In Dong ,Tel: +82-2-2210-2532, Fax: +82-2-2244-2245, Email: jidong@uos.ac.kr
Received: April 9, 2003;  Accepted: October 11, 2003.
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ABSTRACT
The purpose of this study is to understand the characteristics of pyrolysis products through lab-scale pyrolysis tests of MSW (Municipal Solid Waste) at different operating conditions and to get optimum conditions for desirable products. Target samples were recomposed of each component based on dry compositions of MSWs directly collected from S city. Isothermal pyrolysis experiments were performed at different conditions for 45g of MSW samples in a batch reactor. The temperature was varied from 400°C to 700°C. Oxygen concentration was varied as 5%, 10% and 15% with 60cc/min inflow rate of O2. Pyrolysis products such as char, oil, tar, gas obtained at each pyrolysis condition were analyzed in terms of yield, composition and heat values. The results of this studies indicated that decomposition reaction at low oxygen concentration is much faster than nitrogen atmosphere. Gaseous products (CO, H2, CH4) were obtained more effectively at higher temperature but the amount of gaseous product suitable for auxiliary fuel was relatively small. Tar and wax were the main components of liquid products. Since the amount of oil is small and it is mostly hydrophilic, it is considered not feasible to use as a main fuel. It was found that char product has a value of fuel due to its high calorific value. From this fact, it would be one option to try to obtain more char as a target product from MSWs pyrolysis process. From the results of experiments done at different pyrolysis conditions, most of reactions occur in initial 10 — 15 minutes. Therefore, the reaction of initial stage could be considered as the most important step of total pyrolysis process.
Keywords: MSWs | Isothermal pyrolysis | Fuel | Batch reactor | Pyrolysis products
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