CATEGORY: PREHEAT TRAINS
Proceedings of International Conference on Heat
Exchanger Fouling and Cleaning, June 09 - 14, 2013, Budapest, Hungary
Application of complex approach to
troubleshooting related to waste gas preheater fouling
P. Stehlik, Z. Jegla, and B. Kilkovsky
Institute of Process and Environmental Engineering, Faculty of Mechanical
Engineering, Brno University of Technology, Czech Republic
Abstract
Application of a complex approach to solution of elimination of fouling and
operating troubles of a waste gas preheater is presented in the paper.
The waste gas preheater is a part of a gaseous
wastes incineration plant serving for incineration of wastes from acrylic
monomer production plant. The preheater is configured as a specific U-tube bank
heat exchanger and is used for preheating of a process waste gas (PWG), flowing
inside tubes, before its incineration. Flue gas as a product of incineration of
PWG serves as hot fluid in the shell-side of the preheater. Thermal duty of the
preheater (given by outlet PWG temperature) substantially influences quality of
incineration and emissions in the existing flue gas. Operating difficulties of
preheater consist of plucking of U-tubes from tube sheet at the cold end of the
preheater and of decreasing the duty due to intensive fouling (by both process
fluids). Moreover, fouling present on the PWG side causes clogging of some
tubes due to drifted sticky droplets contained in the PWG stream.
Due to operating troubles of this preheater
requiring frequent cleaning and maintenance, currently the incineration plant
requires frequent shutdowns. This fact negatively influences not only the
lifetime of individual parts of the incineration plant, but also, and to a
greater extent, the production of the monomer plant, which cannot be operated
without a running incineration plant. Complex approach applied to solving of
the preheater problems includes analysis and troubleshooting procedures which
are described in detail. A comprehensive set of non-costly measures is proposed
and successfully implemented for the elimination of preheater operating
troubles.
Free Full Text Source: http://www.heatexchanger-fouling.com/papers/papers2013/09_Stehlmk_F.pdf
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