Book/Report

FZJ-2018-04220

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Experimentelle Untersuchungen zur Charakterisierung des Fließ- und Zerstäubungsverhaltens von Pulverharz-Suspensionen im Hinblick auf eine Sprühinjektions-Verbrennung

Bohlender, A. (Corresponding author)FZJ*

1993
Forschungszentrum Jülich GmbH Zentralbibliothek Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/19340

Report No.: Juel-2758

Abstract: Used bead- and powdered resins respectively powdered resin / polyacrylenitrile fibre mixtures from nuclear power plants are usually dried before they will be stored in barrels. Treatment by an incineration process might become the method of choice, because future disposal of combustible radioactive waste will be further restricted. Promising experiences have been gained with a spray-injection incineration process, where a large combustion surface is created by atomizing the waste with the help of nozzles. Considering the design of a spray-injection combustion facility this thesis evaluates as well the material- and slurry specific- as the process- and apparatus-technical parameters. To perform corresponding experiments a laboratory facility was designed and constructed at the institute for "Chemische Technologie" for testing of different nozzles in respect of their atomization characteristics. As carrier liquids were used water and a hydrocrack gasoil residue. The essential results of the experimental investigations can be summarized as followed: Wet grinding experiments showed, that resins can be easily crushed. In particular bead resins can be grinded down to the size of powdered resin particles. Without additives aqeous powdered resin slurries (mixture ratios of cation- and anionexchanger between 1:1 and 3:1) are flowable up to resin contents of 20 wt.%. By adding of additives it is possible to increase the maximum solid content up to 28 wt.%. If oil is used as carrier liquid, the resins have to be dried, because moist resins agglomerate in combination with oil. Since used resins are usually dried anyhow before they will be stored in barrels, oil is an interesting alternative as against water. Comparing with water oil offers the advantage to get stable and flowable slurries up to resin contents of 40 wt.% without the necessity of adding supplementary fuel for the incineration process. High concentrated aqueous powdered resin / polyacrylenirile (PAN) fibre slurries show a tendency to form agglomerates. Only one of the tested nozzles, the so called supersonic nozzle, guaranteed a trouble free atomization. Powdered resin / PAN-fibre (mixture ratio of 4:1) slurries were atomized up to solid contents of 26 wt.%. Powdered resin / oil slurries without PAN-fibres could be atomized up to solid contents of 40 wt.%. Up to which solid contend a trouble free atomization of oil slurries is possible wasn't cleared up precisely. By experiments with a real radioactive waste from the nuclear power plant Krümmel (KKK) could be demonstrated, that a 25 wt.% waste contenting oil slurry can be easily atomized.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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