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Filtration performances of a lab bag-filter unit under specifications of incineration fluegas treatment

Abstract : Up to now, there is no peculiar approved procedure for the waste management of nanoobjects at their end of life, mainly because the current regulation does not consider the typical nanospecificity of such emerging products. The French project “NANOFlueGas” aims to provide data and to examine nanosafety aspects at the destruction stage of nanomanufactured products by incineration. One part of the project deals with the evaluation of the performances of a bag filter unit regarding its clogging with a characteristic nanosize aerosol emitted from nanowaste incineration in boiler output. A laboratory-scale filtration unit was developed where a single bag filter was implemented (reduced height to 0.44 m). The porous media was constituted from Teflon fibers. The main structural parameters of the media are presented in Table 1. The aerosol used for clogging tests was formed by a mix of suspended particles of activated carbon and sodium bicarbonate (SAG 420, TOPAS), mainly introduced in the flue gas treatment line for dioxin/furan and acid gas removal, and a condensation aerosol from graphite monoliths (DNP 2000, Palas) whose particle-size distribution and shape were chosen in order to be representative of the aerosol emissions determined from preliminary tests with a laboratory-scale incineration unit and a nanowaste (Tran et al., 2012). In order to be consistent with the real operating conditions in flue gas treatment lines, the airflow and the bag filter were heated to 150°C, the filtration unit was insulated and 10-12% of water content was maintained in the airflow by water injection. Filtration velocity through the bag filter was 1.9 cm/s. Figure 1 represents the particle size distribution of the aerosol upstream the bag filter. The performances were evaluated throughout the clogging in terms of filter pressure drop and particle collection efficiency from hot sampling and dilution before particle counting (ELPI, Dekati at 150°C). Three experimental tests were carried out. The evolutions of the filter performances are displayed in Figure 2. Results showed a high particle collection efficiency of the filtration unit whatever the level of clogging. The study of fractional efficiency led to the same conclusions whatever the particle size. As expected, the filter pressure drop increased with the clogging. Initial pressure drop values increased with the tests which can be explained by the off-line cleaning procedure implemented.
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Submitted on : Wednesday, August 8, 2018 - 11:12:56 AM
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  • HAL Id : ineris-01855530, version 1

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Aurélie Joubert, Dinh-Trinh Tran, Olivier Le Bihan, Bruno Debray, Danielle Venditti, et al.. Filtration performances of a lab bag-filter unit under specifications of incineration fluegas treatment. Conference on Aerosol Technology 2014, Jun 2014, Karlsruhe, Germany. pp.Abstract T290A2. ⟨ineris-01855530⟩

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