Volumes IV.    Number  3    October 2021    Year 2021
Authors Title Pages
Stanisław Gil, Wojciech Bialik, Sławomir Kozłowski Generation of Nitrogen Oxides in Submerged Arc Furnace during the Production of Ferroalloys 37-41
Kamil Sikora Automatic Corrector of Forming Operations on High Speed Forging Machines 42-44
Šimon Staško, Gustáv Jablonský, Ján Kizek, Róbert Dzurňák, Ladislav Lukáč Design of Sensible Heat Storage Tank for Education 45-51

Pages 37- 41

Title:

Generation of Nitrogen Oxides in Submerged Arc Furnace during the Production of Ferroalloys

Authors:

Stanisław Gil, Wojciech Bialik, Sławomir Kozłowski

Abstract:

The paper presents the method of selection of hard coals applied in reducing mixtures used in ferroalloy production technologies. The graphical relationship between reflectivity and reactivity towards SiO as well as reflectivity and the content of hard carbon Cfix has been presented. The use of hard coal in place of coke is associated with the release of significant amounts of volatiles contained in the coal. Increasing the amount of volatile matter may favor the increased generation of NOx from the fuel mechanism due to the nitrogen content in the organic matter of coal. The influence of the thermal mechanism of NOx generation may be limited due to contradictory phenomena. On the one hand, it is possible to have a higher calorimetric combustion temperature of post-reaction gases (due to the content of coal degassing products), and on the other hand, reducing the amount of energy released from SiO afterburning (less SiO due to higher silicon yields). The higher yield of silicon is related to the higher reactivity of appropriately selected hard coals. The mechanisms of NOx formation were presented together with measurements made during the production of the most popular ferroalloy FeSi75. Measurements were carried out along the two axes P1 and P2 in the furnace hood at three distances from the center of the pitch diameter of the electrodes.

Citation:

Gil Stanisław, Bialik Wojciech, Kozłowski Sławomir: Generation of Nitrogen Oxides in Submerged Arc Furnace during the Production of Ferroalloys, Advance in Thermal Processes and Energy Transformation, Volume 4, No. 3 (2021), pp. 37-41, ISSN 2585-9102

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Pages 42 - 44

Title:

Automatic Corrector of Forming Operations on High Speed Forging Machines

Authors:

Kamil Sikora

Abstract:

When forging rods with diameters larger than 200 mm, excessive wear of the anvils often occurs. Worn anvils then inaccurately measure the continuous dimensions of forged bars. In response, it has been proposed to develop a new aiming method, which should use a laser camera to determine the inter-operational dimensions of the forged bars, taking into account the wear of the anvils. This information would be used to correct the forging algorithm and thus to refine the final forging operations.

Citation:

Sikora Kamil: Automatic Corrector of Forming Operations on High Speed Forging Machines, Advance in Thermal Processes and Energy Transformation, Volume 4, No.3 (2021), pp. 42-44, ISSN 2585-9102

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Pages 45 - 51

Title:

Design of Sensible Heat Storage Tank for Education

Authors:

Šimon Staško, Gustáv Jablonský, Ján Kizek, Róbert Dzurňák, Ladislav Lukáč

Abstract:

Thermal energy and its need for humans will always be a serious issue. We come into contact with heat anywhere. From warming yourself by the fireplace, to taking a nice bath in warm water. Sufficient heat needs to be provided for all areas of society. Using thermal energy storage makes sense for heat sources that cannot deliver the required amount of heat in a short period of time. To ensure that there is always enough heat, the efficiency of heat-handling equipment needs to be improved. This requires a sufficient number of experts to further develop the domain of heat accumulation. Students’ education in this domain through laboratory exercises is the proper step. Students acquire theoretical knowledge and practical skills. At the same time, they test the efficiency of heat storage and look for innovation in this domain. It will be achieved specifically, by designing a heat storage tank teaching model in various designs from the perspective of material construction, heat bearing medium and by changing other parameters of the storage tank or measuring environment. They also compare computer simulations to see what effect the direction of flow of the heat transfer medium has on the functionality of the heat storage device. By subsequently measuring and processing the collected data, students can determine the effectiveness of individual designs of this heat storage device learning model. They can then use the acquired knowledge and practical skills in practice.

Citation:

Staško Šimon, Jablonský Gustáv, Kizek Ján, Dzurňák Róbert, Lukáč Ladislav: Design of sensible heat storage tank for education, Advance in Thermal Processes and Energy Transformation, Volume 4, No.3 (2021), p. 45-51, ISSN 2585-9102

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