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Wyświetlanie 1-2 z 2
Tytuł:
Sedymentacja siarczanu baru w osadniku jako metoda ograniczenia ilości osadów stałych w rurociągu odpływowym KWK "Jankowice"
Sedimentation of barium sulphate in settler as a method of limitation of solid residues in Jankowice outflow pipe-line
Autorzy:
Branny, M.
Swolkień, J.
Powiązania:
https://bibliotekanauki.pl/articles/1819702.pdf
Data publikacji:
2010
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
KWK Jankowice
siarczan baru
rurociąg odpływowy
osadnik
barium sulfate
drainage pipelines
settler
Opis:
Zjawisko wytrącania się w rurociągach kolektora "Olza" osadów stałych siarczanu baru stanowi poważne zagrożenie dla ich stanu technicznego. Wprowadzanie odpowiednich metod ograniczenia ilości tych osadów pozwala rozwiązać ten problem. Należy pamiętać jednak, że nie każda metoda neutralizacji znajdzie swoje zastosowanie w wybranych kopalniach. Z punktu widzenia kopalni Jankowice najskuteczniejsza wydaje się być metoda sedymentacji osadów w zbiornikach przykopalnianych. Poznanie mechanizmu przebiegu sedymentacji, przy pomocy metody symulacji numerycznej, pozwoliło w przybliżony sposób określić jego efektywność. Jej wartość przy średnicy cząstek 7ź10-6 m wynosi 99%. Problemem jest jednak fakt, niema możności dokładnego określenia średnicy cząsteczek siarczanu baru. Przebieg procesu sedymentacji w osadniku ściśle zależy od jego geometrii i rozmieszczenia otworów wlotowych i wylotowych, a to ma wpływ na czas przebywania cząstek w osadniku. W przypadku osadnika kopalni Jankowice pomiary stężeń jonów baru i siarczanowych na wlocie i wylocie potwierdziły, że proces sedymentacji przebiega praktycznie ze 100% efektywnością. Połączenie chemicznej analizy procesu sedymentacji z analizą jego przebiegu metodą symulacji numerycznej, a także systematyczną kontrolą stężeń jonów na wlocie i wylocie z osadnika stwarza możliwości zastosowania tej metody w innych kopalniach, jak również wykorzystania jej przy projektowaniu nowych zbiorników, tak aby zapewnić najlepsze parametry procesu.
The article treats about the process of barium sulphate deposits flow through the Jankowice's settling tank. "Jankowice" coal mine transports its mine waters through the "Olza" retaining-dose system. The waters' chemical character strongly depends on the hydrological lay of land of the south-western part of Upper Silesia. The different chemical character of transported waters is a main reason for precipitation of solid sediments in the interceptor-sewer's pipe-lines. This leads to their overgrowingwith sediment, increasing of water pumping energy and, in the end, necessity of overhaul repairs. Therefore, it is very important to get to know the chemical character of mine waters through the years. Authors described changes of the barium and sulphates ions' concentrations in the water transported to the river from "Jankowice" and "Chwalowice" coal mines in the period of VI 2003-V 2006. From 1993 "Jankowice" mine, through the medium of one big settling tank, drains off its waters with increased concentration of barium ions, and also waters of increased concentration of sulphate ions coming from "Chwalowice" coal mine. The process of precipitation of barium sulphate is almost immediate and it is a source of huge technical problems for the interceptor sewer. It is also very important to analyze the process of chemical sedimentation of barium sulphate by usage of chemical equations. This allows to estimate the amount of sulphates ions needed to precipitate barium ions. Due to the strong contaminations of "Jankowice" and "Chwalowice" waters special water cleansing methods were introduced. They were focused on removing barium and suphate ions and most of them were highly effective. Unfortunately the amount of sulphates ions used in certain methods was insufficientto remove whole barium ions. Therefore, there was another method used. The process of precipitation of barium sulphate is being proceed at the source, that is in the settling tank. In order to prevent penetrating the remaining barium sulphate into the pipe-lines it is necessary to get to know the process of its sedimentation and its efficiency. Numerical simulation of the solid particles flow (barium sulphate) proceeded in this article throughout Fluent 6.1, is the way of describing the sedimentation process. Usage of the two-phase model flow throughout the calculations of the velocity field and trajectory of barium sulphate particles, allows to pinpoint the sedimentation efficiency and the particles' descending time (timeof particles being in the settler). The calculated sedimentation efficiency for the particles of 7ź10-6 m diameter for the "Jankwice" settler was 99%, which means that the whole barium ions were precipitated. Unfortunately difficulties with clear specification of the barium sulphate particles' diameter reflect on the appraisingtheir free descending velocity and in the end on the sedimentation efficiency. Thesedimentation efficiency and descending time depend also on the settler geometry, inlet and outlet placing (water inflow and outflow), and flowing watervolume flux. Thus, the same sedimentation process proceeded in geometrically different settler would give different sedimentation efficiency. Numerical calculations of the different mass flux suspension flow through the settlers of different geometry allow to demonstrate the process of sedimentation. This knowledge might be useful during the settlers' modernization. Not only does it concern the optimization of the settlers' shape and arranging inlet and exit cavities but also designing new objects.
Źródło:
Rocznik Ochrona Środowiska; 2010, Tom 12; 927-946
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zmian technologicznych w kolektorze „Olza” na skład chemiczny wód rzeki Odry i jej dopływów
Influence of technological changes in “Olza” sewer interceptor on the chemical composition of Odra river and its inflows
Autorzy:
Swolkień, J
Filek, K.
Powiązania:
https://bibliotekanauki.pl/articles/1819273.pdf
Data publikacji:
2012
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
Odra
kolektor Olza
skład chemiczny wód
wody kopalniane
Opis:
Protection of Odra river quality against harmful mine waters is a huge challenge for science. This article treats about the influence of technological changes in the dropping system “Olza” on the chemical composition of the Odrariver waters and its inflows. The content of this article is of high importance for the environment of rivers located in the area of south -western part of Upper Silesian Coal Basin. High quality of waters is very important not only for their flora and fauna but also for people who use those waters for their daily purposes. There are eight coal mines located on the area of south-western part of Upper Silesian Coal Basin. Exploitation of hard coal deposits forces coal mines to drain their mine waters off directly to the closest rivers. The main watercourse of this area is Odra river along with its inflows river Olza and Lesnica (this one is Szotkowka’s inflow). Seeing off strongly contaminated mine waters directly to the Odra and to the rivers mentioned above caused the strong perturbations in the rivers flow. What is more it had a bad influence on their flora and fauna. Lesnica and Olza rivers were the most jeopardize ones, taking into consideration the fact that the mine waters transported from the south-west part of Upper Silesian Coal Basin were directly thrown to their waters. Strongly contaminated, mostly with chlorides and sulphates, mine waters, managed to destroy the whole rivers ecosystem. Huge chloride fluctuations were the cause of biological balance dysfunction. Most animals and plants species were destroyed. In the Olza river there was almost ten times excess of the second class degree in chlorides. In Odra river those excess were lower (only four times) just because the water managed to thin down. Taking into consideration those facts mine waters couldn’t be transported directly to the rivers. In term of 17 years, mine waters were transported through the interceptor sewer called “Olza”. System was based on the net of pipelines connecting cretin mines and their settlers with the drain line placed at the Lesnica’s river bank. The whole system belongs to the JSW Group. The brake through came after the new dropping system was activated. The system was old and needed some changes and modernizations. The old steel pipelines were replaced with new ones, made with PE and the two settlers, which belong to Moszczenica Coal Mine, were put in to the system. The new system was placed in the bottom of Odra river and was equipped with 51 nozzles settled down between two river banks. The modernization allowed to eliminate the contamination of the Lesnica and Olza rivers and prevented their flora and fauna from total distraction. It also allowed to mix the mine and the river waters just after the drop. It led to the elimination of huge chloride fluctuation in the Odra river and had a huge impact on its quality improvement. It also allowed to lower down the sulphate concentrations and what is the most important to control the magnitude of water which is transported directly to the river.
Źródło:
Rocznik Ochrona Środowiska; 2012, Tom 14; 945-959
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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