Gas cleaning test using a ceramet filter in fluidized bed dewatering and calcining waste solutions

Autor: N. S. Lokotanov, O. A. Nosyrev
Rok vydání: 1975
Předmět:
Zdroj: Soviet Atomic Energy. 38:421-423
ISSN: 1573-8205
0038-531X
DOI: 10.1007/bf01130951
Popis: Waste gases from drying and dehydration processes in fluidized bed apparatus contain suspended particles. Concentration (by weight) of these can be as high as 50 g/m/sup 3/. Product loss reduction and atmospheric pollution prevention are the most common reasons for removing the suspended particles. Dewatering and calcining of nuclear power industry waste solutions requires special attention to the second objective. Equipment widely used in drying installations (cyclones, scrubbers, electrostatic precipitators, and bag filters) do not meet the special conditions of these processes and do not provide the required level of contaminant removal. Research and investigation of gas cleaning methods, which meet the more stringent process requirements and conditions, is one of the most important problems in the reprocessing of liquid wastes. Test results are presented of experiments using a 26 m/sup 2/ effective surface ceramet filter. These tests lasted for 1000 h at a dewatering and calcination fluidized bed unit for nitrate--phosphate solutions. Solution composition was: 125 g/liter NaNO/sub 3/, 240 g/liter Al(NO/sub 3/)/sub 3/, 120 g/liter H/sub 3/PO/sub 4/, and 90 g/liter residue. Test results showed that solid particle concentration in the gaseous filtrate did not exceed 9 x 10/sup -3/ g/m/sup 3/ at STP; the average was 5more » x 10/sup -3/ g/m/sup 3/. The calculated coefficient of solid particle removal from waste gases on the ceramet filters was 10/sup 3/ to 10/sup 4/.« less
Databáze: OpenAIRE
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