Factors affecting deposit formation in foul condensate stripping systems, TAPPI Journal June 2024

 


Application: This paper provides information about the characteristics of organic deposits formed in the foul condensate stripping system and potential factors contributing to their formation. The insights gained and the information provided may help mills that have been experiencing this type of deposition.

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Author: Torsten Meyer, Thiago Silva Pinto De Faria, Cláudio B. Xavier, and Honghi Tran
Factors affecting deposit formation in foul condensate strip
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.
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