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Energies 2015, 8(2), 1101-1113; doi:10.3390/en8021101

Slagging and Fouling Characteristics of HRSG for Ferrosilicon Electric Furnaces

Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
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Academic Editor: Mehrdad Massoudi
Received: 15 October 2014 / Accepted: 19 January 2015 / Published: 2 February 2015
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Abstract

The slagging and fouling characteristics of the heat recovery steam generator (HRSG) for ferrosilicon electric furnaces are discussed in this paper. Three ash samples were taken from the HRSG of a ferrosilicon furnace in Ningxia Province, China, which suffered from serious slagging and fouling. X-ray fluorescence (XRF), X-ray powder diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the ash samples. The results show that low melting point salt Na2SO4 and composite salts Na (AlSi3O8) and 3K2SO4·CaSO4 deposit on the superheater tube walls in aerosol form and solidify to form the initial slag layer. With the continuous deposition of the low melting point compounds, more and more ash particles in the flue gas adhere to the slag surface to form a thicker slag. Low melting point composite salt NaO·Al2O3·SiO2 is absorbed on the evaporator tube walls in aerosol form. With the deposition of NaO·Al2O3·SiO2, more and more ash particles are absorbed to form the fouling. Since there is less space between pin-finned tubes, the large iron-rich slag particles are easily deposited on tube walls and fin surfaces, which is advantageous to the fouling process. There are large quantities of superfine ash particles in the flue gas that easily adhere to other particles or tube walls, which facilitates the slagging and fouling process. View Full-Text
Keywords: ferrosilicon furnace; HRSG; slagging; fouling; low melting point compound; superfine particle ferrosilicon furnace; HRSG; slagging; fouling; low melting point compound; superfine particle
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, Y.; Chen, H.; Chen, Z.; Ma, H.; Zhao, Q. Slagging and Fouling Characteristics of HRSG for Ferrosilicon Electric Furnaces. Energies 2015, 8, 1101-1113.

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