References ZareNezhad, B.; Aminian, A. Accurate prediction of the dew points of acidic combustion gases by using an artificial neural network model. Energy Conversion and Management 2011 52 , 911-916. Huijbregts, W.; Leferink, R. Latest advances in the understanding of acid dewpoint corrosion: Corrosion and stress corrosion cracking in combustion gas condensates. Anti-Corrosion Methods and Materials 2004 51 (3), 173-188. Ganapathy, V. Calculating dew points of various acid
J Mlnařík and J Hruška
J. Mlnařík and J. Hruška
V důsledku poklesu teploty spalin pod teplotu rosného bodu dochází u řady energetických celků k problémům s korozí vlivem zkondenzovaných kyselin. Dochází tak k značným korozním napadením a poškozením zejména na ohřívácích vzduchu, ekonomizérech, vedeních kouřovodů, ale i v samotném komíně. Ve SVÚM se vyvíjí automatický systém pro kontinuální měření teploty rosného bodu spalin přímo ve spalovacím zařízení. V této práci jsou shrnuty výsledky z dosavadních příprav pilotního provozu v uhelné elektrárně.
J. Cizner, J. Hruška and J. Mlnařík
Corrosion tests of both annealed and not annealed bends of HR3C and S304H steels in operation conditions of black and brown coal combustion boilers in EPRU and EDE. After a long-term exposure, the samples were assessed gravimetrically and metallographically. The comparison of annealed and unannealed states showed higher corrosion rates in the annealed state; corrosion of the sample surface did not essentially differ for compression and tensile parts of the beams. Detailed assessment of both steels is described in detail in this study.
M. Blahetová, J. Horák, P. Kubesa, S. Lasek and T. Ochodek
The case study of chimney liner corrosion addresses three specific cases of damage of chimney systems from of stainless steels. These systems were used for flue of gas arising from the combustion of brown coal in small automatic boilers, which are used for heating. Detailed analyzes implied that the cause of devastating corrosion of the steel AISI 316 and 304 steel (CSN 17349, 17241) was particularly high content of halides (chlorides and fluorides), which caused a severe pitting corrosion, which led up to the perforation of the liner material. Simultaneous reduction of the thickness of the used sheets was due to by the general corrosion, which was caused by the sulfur in the solid fuel. The condensation then led to acid environment and therefore the corrosion below the dew point of the sulfuric acid has occurred. All is documented by metallographic analysis and microanalysis of the corrosion products.
J. Poláčková, J. Petrů, M. Janák, J. Berka and A. Krausová
References 1. Blamey J., Anthony E. J., Wang J., Fenell P. S.: The calcium looping cycle for large-scale CO2 capture. Progress in Energy and Combustion Science 2010, 36, 260-279. 2. Ciahotný K., Staf M., Hlinčík T., Vrbová V., Tekáč J., Jiříček I.: Vysokoteplotní karbonátová smyčka - moderní metoda odstraňování CO2 ze spalin. Http://hitecarlo.vscht.cz (Accesed 9 May 2017). 3. Sim S., Cole I.S., Choi Y.-S., Birbilis N.: A review of the protection strategies against internal corrosion for the safe transport of
K. Nechvílová and A. Kalendová
, Progress in Organic Coatings 2000 , 38, 199–206. 8. Kurian M., Nair D. S. Effect of preparation conditions on Nickel Zinc Ferrite nanoparticles: A comparison between sol-gel auto combustion and co-precipitation methods, Journal of Saudi Chemical Society 2016 , 20, S517–S522. 9. Armelin E. Anticorrosion performances of epoxy coatings modified with polyaniline: A comparison between the emeraldine base and salt forms, Progress in Organic Coatings 2009 , 65, 88–93. 10. Alam J. High performance corrosion resistant polyaniline/alkyd ecofriendly
V. Antušková and I. Kučerová
Inorganic compounds were often used to protect wood from wood-decaying fungi and insects (e.g. compounds of arsenic, copper, chromium, zinc or boron) or as a retarder of combustion (e.g. ammonium salts, boron compounds). However, their use may accelerate degradation processes, which may show up as worsening of mechanical properties. The study deals with the impact of selected inorganic compounds (sodium chloride, copper sulphate pentahydrate, boric acid and ammonium sulphate) on cellulose. The samples of cellulose impregnated with the said compounds were subject to artificial aging. The cellulose was monitored for weight changes, changes in colour, values of aqueous extract pH, an average polymerization grade, mechanical properties, elementary composition and the content of bound inorganic compounds. The study was meant to identify stability of the used inorganic compounds in the conditions of artificial aging. The results imply that copper sulphate pentahydrate and ammonium sulphate accelerated degradation of cellulose the most. The effect of boric acid lead to larger deterioration of specimens namely in the conditions of dry aging. Sodium chloride had a negligible impact on the course of degradation. Used compounds continue to be at least partly retained in the cellulose specimens even after rinsing.