Correlation Between the Combustion Performance Indices-DRE,CE and PICs in a Laboratory Scale Spouted Bed Incinerator
| Autor: | Wu, Tzung-Chieh, 吳宗杰 |
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| Rok vydání: | 1997 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 85 Incineration is one of the most efficient disposal processes to treat Incineration is one of the most efficient disposal processes to treatme red stream.An obvious advantage of incineration is the large mass and volumessions have found in the exhaust stream of incinerator. The major concern regarding organic emissions from hazardous waste incineration system is to form the products of incomplete combustion(PICs). DRE( Destruction and Removal Efficiency) of POHCs(Principal of Organic Hazardous Constituents) and CE(Combustion Efficiency)are the representative indices to evaluate the performance of incineration system. The correlations between DRE of POHCs, CE and the formation and destruction of PICs are investigated in this study.A laboratory scale incinere stabil ty under the designed operating conditions. These advantages stimulate the application of a laboratory scale combustor to investigate the key operating parameters related to the treatment performance in terms of CE, DRE of POHCs as well as the PICs. The spouted bed combustor employed in this study is a cone-shaped all-quartz reactor. The reaction is uninsulated so as to faciliate visual observation of the phenomena inside the combustor. Flue gas samples for DRE and PICs analysis are drawn continuously from the desired locations. After pretreatment, samples are injected into the GC/MSD and GC/FID to identify and quantify compounds. The basic gas measurements from combustor including O2, CO2, CO, SOx, NOx is made with Flue Gas Analyser.Experimental results indicate that the concentration of CO near the wall of reactor is higher than it appears at the center of reactor. The effects are possibly caused by the physical mixing level and the residence time distribution. It suggests that the residence time scale of flue gas and the characteristics of PICs must be considered when using the DRE of POHCs to evaluate the incineration performance. Due to imperfect mixing, the PICs have the possibility to be produced in the pyrolysis pocket region. These by-products are highly dependent on the characteristics of fuel and the combustion operating parameters(ie, equivalence ratio, bed temperature ---etc.). The results from our laboratory investigations have presented evidence that both physical mixing and chemical kinetics could interpret several reaction pathways in the PICs scheme. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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