Abstract
The dissolution behavior of magnetite deposited on flow mini-channel surfaces within a printed circuit heat exchanger (PCHE) and the corrosion behavior of a STS 316L PCHE material were investigated in an ethylendiaminetetraacetic acid (EDTA)-based chemical cleaning solution at 93 °C. The fouling in the PCHE was simulated using a water-steam circulation loop system. Most of the magnetite deposits were rapidly dissolved in the early stage of the circulation chemical cleaning. An empirical equation for estimating the dissolution percentage was derived as a function of cleaning time. The PCHE material showed excellent corrosion resistance during the chemical cleaning tests. These results indicate the fouling layers in the PCHEs can be removed efficiently by the chemical cleaning process without concern about base metal corrosion.
Highlights
Heat Exchanger in an ethylendiaminetetraacetic acid (EDTA)-BasedA heat exchanger is one of the most important components in the energy production industry, and many studies are underway to increase its heat transfer efficiency
It magnetite was confirmed that thePCHEs corrosion affected the material were investigated when chemical cleaning was performed with an by the solution flow
Thisof indicates thatwere the chemical cleaning method using particles, which had a stoichiometry and a crystalline structure corresponding to that an EDTA-based solution can be implemented for fouled printed circuit heat exchanger (PCHE) within well-controlled of magnetite
Summary
A heat exchanger is one of the most important components in the energy production industry, and many studies are underway to increase its heat transfer efficiency. A shell-and-tube steam generator (SG) consists of thousands of tubes and has the largest volume among the components in a pressurized water reactor (PWR). A rupture of a single tube at operating PWRs may result in the failure of some neighboring tubes in the tube bundle. Heat transfer efficiency, and safety issues must always be considered together. There has been a growing interest in printed circuit heat exchangers (PCHEs) of a plate type in an effort to improve the above-mentioned drawbacks [1,2,3,4,5,6,7]
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