A printed circuit steam generator (PCSG) has a high heat transfer area per unit volume due to small and narrow flow mini-channels, but the mini-channels are expected to be prone to fouling by corrosion products in water. In this work, the fouling behavior was investigated using the flow mini-channels of a PCSG in which feedwater was transformed to superheated steam. The deposits on the channels were found to be composed of numerous magnetite particles with a polyhedral shape, sizes up to ∼2 μm, and 17 % porosity. The amount of deposits was largest in the first main flow channel zone where saturation boiling began, and declined gradually toward the steam outlet. The fouling layer was perfectly removed using an ethylendiaminetetraacetic acid (EDTA)-based chemical cleaning process.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation (NRF) grant of the Republic of Korea funded by the Korean government (grant numbers: NRF-2018M2A8A4081307, NRF-2017M2A8A4015159).
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All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering