Corrosion of a chimney liner operated for 130,000 hours

J. Min. Metall. Sect. B-Metall., 59 (2) (2023) 269-277. DOI:10.2298/JMMB230206023G
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Available online 14 August 2023
(Received 06 February 2023; Accepted 08 August 2023)


The tests were carried out for a coal-fired boiler heating a single-family house with a floor area of 220 m2. The tests concerned the chimney lining (structure and surface layer – produced oxides/deposits), hard coal (eco-pea coal) and furnace ash. The chimney liner was located in a chimney made of bricks joined with concrete. A chimney liner made of austenitic steel was tested. The chimney liner was operated for 130,000 hours. The chimney insert was studied on the insideand outside each cross-section. Coal with a grain size of 5–21 mm was analyzed. The bottom ash consisted of both loose ash and a mass of glassy sintered ash, the so-called slag. The thorough examinations of the examined materialsincludec: microscopic examinations with a VHX-7000 digital microscope and Jeol JSM-6610LV scanning electron microscopes. Chemical composition analysis by energy dispersive X-ray spectroscopy (EDS) in conjunction with the scanning electron microscopy (SEM). The surface topography (roughness) was measured with a VHX microscope using a Gaussian filter. Based on the tests, the following parameters were determined: arithmetic mean height, maximum height, height of the highest peak, depth of the lowest depression, root mean square height, skewness, kurtosis.

Keywords: Chimney insert; Eco-pea coal; Austenitic steel

Correspondence Address:
M. Gwoździk,
Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology, Department of Materials Engineering, Czestochowa, Poland;

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