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Control of Incinerator Pollutants by a Fluidized Bed Reactor
|關鍵字:||fluidized bed reactor|
The major objective of the study focuses on the control of particulates in flue gas. The fluidized bed reactor was employed in a laboratory-scale fluidized bed incinerator to demonstrate the performance of the fluidized bed reactor for removal of particulates simulated or generated from incineration at various fluidized operating conditions, and then the control mechanisms of particulates filtered by fluidized bed were studied. Subsequently, a fluidized bed adsorber integrated with a fabric filter applied to control the incinerator pollutants contained organic, heavy metal and acid gas emissions individually and simultaneously during incineration process were evaluated. Heat treatment of incinerator retired sorbents containing heavy metals could increase the stability of metals was also identified. While comparing the results of the elutriation of group B-C mixtures (activated carbon and simulated fly ash) with the removal of simulated fly ash using a fluidized bed reactor, the results indicate that the elutriation mechanism is not similar to the filtration mechanism. Higher operating velocities and fixed bed heights can enhance the removal of simulated fly ash and inertial impaction is the main mechanism when the fluidized bed is controlled at room temperature (25℃). Besides inertial impaction, diffusion mechanism also occurs when the fluidized bed is controlled at high temperature (200℃) and the temperature effect covers the effects of fixed bed height and operating velocity. On the other hand, the fluidized bed has the ability to filter 93.2% to 99.4% submicron simulated fly ash, and higher temperature is a favorable condition due to diffusion mechanism. Because of the removal efficiency of fly ash generated from incineration is much lower than that of simulated fly ash; it is supposed that characteristics of fly such as chemical composition are also the major factors when using a fluidized bed to filter particulates. A novel air pollution control devices (APCDs) combination, the fluidized bed adsorber integrated with a fabric filter, can control organics, heavy metals and acid gases simultaneously. Activated carbon after immersing with KOH solution is benefit to adsorb gaseous phase PAHs, and higher adsorption temperatures can increase the removal efficiencies of metals due to chemical adsorption. Heat treatment, serving as a control technique for heavy metals on retired sorbents, is effective and feasible, especially for Pb, and the influence of treatment temperature is more important than treatment time.
|Appears in Collections:||環境工程學系所|
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