Factors affecting deposit formation in foul condensate stripping systems-Reference-Cited by-同舟云学术

Factors affecting deposit formation in foul condensate stripping systems

Published:2024-06-27 Issue:6 Volume:23 Page:305-314
ISSN:0734-1415
Container-title:TAPPI Journal
language:en
Short-container-title:TJ

Author:

MEYER TORSTEN,SILVA PINTO DE FARIA THIAGO,XAVIER CLAUDIO B.,TRAN HONGHI

Abstract

In kraft pulp mills, foul condensates are often steam-stripped to produce clean condensate for use as process water. The formation of organic deposits in the stripped condensate is a common problem. A systematic study was conducted to examine the deposit composition and the most likely operating parameters responsible for stripped condensate contamination experienced at a kraft mill in Brazil. Daily averaged data of 170 operating parameters over a 15-month period were analyzed by means of multivariate discriminant analysis and random forest classification analysis. The results showed that the deposit formation is related to high temperature, pressure, and dry solids operations in various evaporator effects. These conditions, combined with the poor demisting efficiency in these effects, may have increased black liquor carryover mist in the vapor. Deposit formation also appeared to be related to increased throughput of the foul condensate stripping system and increased pressure in the stripper. Results of Fourier transform infrared spectroscopy (FTIR) and pyrolysis-gas chromatography mass spectrometry (Py-GCMS) analyses show that the deposit consists of mostly organic matter that likely originated from wood extractives and lignin.

Publisher

TAPPI

Reference17 articles.

1. Johnson, L.P. and Lin, B. “Foul condensate stripping,” TAPPI Kraft Recovery Operations Course, TAPPI Press, Peachtree Corners, GA, USA, 2023.

2. Foran, D., Lin, B., and Frederick, W.J., “Auxiliary processes,” in Black Liquor Evaporation (J. Frederick and N. DeMartini, Eds.), TAPPI Press, Peachtree Corners, GA, USA, 2019, pp.131-208.

3. Raymond, L., Gagne, A., Talbot, J., et al., Pulp Pap. Can. 99(2):56(1998).

4. Bialczak, S., Peltonen, J., Holmbom, B., et al., Nord. Pulp Paper Res. J. 26(4): 438(2011). https://doi.org/10.3183/npprj-2011-26-04-p438-444.

5. Sithole, B., Lapierre, L., and Watanabe, C., Appita J. 66(1): 59(2013).