Wyniki wyszukiwania - BazTech

1

Strategia wodorowa w Polsce. Prawne wyzwania na drodze do zielonej przyszłości

Krawczyk Magdalena, Zawicki Kamil, Kubek Dorota

Nowa Energia

|

2022

|

nr 3

30--32

PL

Wodór potrzebuje kompleksowej regulacji na miarę, jednak ważne, aby działania legislacyjne skupiały się również na zmianach w aktualnie obowiązujących przepisach i tych obszarach gospodarki, gdzie odnawialny wodór może stanowić innowacyjne rozwiązanie bieżących problemów.

2

Analiza teoretyczna ruchu ziarna na powierzchni stołu koncentracyjnego z napędem typu Concenco

Krawczyk Magdalena

Transport Przemysłowy i Maszyny Robocze

|

2019

|

Nr 3

82--86

PL

Stoły koncentracyjne to urządzenia, w których następuje rozdział materiału wg masy właściwej w wielu powtarzających się cyklach, wywołanych odpowiednimi napędami [4-5]. Tak zwane mokre stoły to urządzenia najczęściej wykorzystywane do wzbogacania węgla w polskich kopalniach. Ponieważ ten proces generuje bardzo wysokie koszty, duże zużycie wody i zanieczyszczanie środowiska, jak również konieczność m.in. prowadzenia gospodarki wodno-mułowej, zostaje coraz częściej zastępowany głównie na obszarach ubogich w wodę przez modele powietrznego stołu koncentracyjnego. Sam proces wzbogacania na tego typu stole przebiega w sposób porównywalny do metody mokrego wzbogacania, z tą różnicą, że rozdział dokonuje się na płycie perforowanej z wymuszonym ruchem powietrza. W tym przypadku tego typu stołów mamy do czynienia z zanieczyszczeniem powietrza. Przeprowadzone w KMGPiT próby wykorzystania różnic współczynników tarcia bez wykorzystania dodatkowego medium [6-7].

EN

Concentration tables belong to the group of oscillatory enrichments, in which the distribution of grains according to their density takes place over many short repeating eyrie, induced by appropriate drives [4-5]. So-called wet concentration tables are devices most often used to enrich coal in Polish mines. This process generates very high costs due to high water consumption, the need to conduct water and mud management as well as environmental pollution. The above reasons cause that it is increasingly being replaced, mainly in areas poor in water, by the model of an air concentration table. The enrichment process on this type of table runs in a manner comparable to the method of wet enrichment with the difference that the separation is made on a perforated plate with forced air movement. In this type of concentration tables, there is air pollution. In KMGPiT, attempts were made to use differences in friction coefficients without additional medium in the investigations described in [6-7]. This paper presents a theoretical analysis of the movement of a single grain on the surface of a concentration table. At the time of writing, encyclopedic data concerning reduction patterns and physics of grain movement on the table of the concentration table were used. The summary presents graphs of grain movement, its velocity and acceleration depending on the coefficients of friction and vibration amplitudes.

3

Modeling the movement of broadcast on the concentration table

Feliks Jacek, Krawczyk Magdalena

New Trends in Production Engineering

|

2019

|

Vol. 2, Iss. 1

304--311

EN

The article attempts to analyze the work of the concentration table, on which the distribution of the material under investigation takes place. The efficiency of separation or otherwise enrichment depends on the drive that puts the concentration table plate into an asymmetrical reciprocating movement. The most frequently used solutions are concentration tables, on which the distribution of enriched material takes place in an aqueous medium commonly called wet enrichment. The AGH University of Science and Technology conducted simulation tests of material enrichment on a concentration table using the differences in friction coefficient commonly referred to as dry enrichment, i.e. without an additional medium. The article presents the effects of simulations that have been carried out for reference materials characterized by different friction coefficients and densities. The summary presents the analysis of obtained effects of computer simulations of material movement with different coefficients of friction. The simulations were carried out for variables: the frequency of vibrations of the concentration table and the angle of inclination of the table of the concentration table. It has been shown that it is possible to enrich the material by changing the above-mentioned operating parameters of the device.

4

Methods of enlarging material to the concentration table

Feliks Jacek, Krawczyk Magdalena

New Trends in Production Engineering

|

2019

|

Vol. 2, Iss. 1

59--68

EN

Concentration tables are one of the oldest oscillatory enrichments with over 100 years of tradition. On this type of distribution tables are made according to material mass in many recurring cycles induced by appropriate drives. So-called wet tables are the devices most often used for coal enrichment in Polish mines because this process generates very high costs, high water consumption and pollution of the environment, as well as the need for, among others, water and mud management is increasingly being replaced mainly in areas poor in water by the modern model of the air concentration table - FGX produced in China. The process of enrichment on this type of table itself runs in a manner comparable to the method of wet enrichment with the difference that the FGX is distributed on a perforated plate, in this case we deal with air pollution. Department of Machinery Engineering and Transport's attempts to use the differences in coefficients of friction in over-resonance screens have shown that it is possible effective separation of grains with different coefficients of friction. The article presents a theoretical analysis and presents the results of performed dry enrichment trials using different coefficients of friction. The summary presents the advantages of using the enrichment method using the differences in friction coefficients and test results.