Temat: airflow rate - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Selection of the best route for column configuration in an existing copper circuit
Autorzy:: Can, N. Metin
Altun, Okan
Powiązania:: https://bibliotekanauki.pl/articles/109679.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: column flotation
sulphide ores
distribution of wash water
airflow rate
froth height
Opis:: This study was aimed to utilize column flotation to obtain much cleaner concentrate in the Cu circuit. However, the numbers of equipment and the proper streams for column application should be the key for successful operation. Therefore, the effects of some operational parameters such as wash water rate, airflow rate and froth height were investigated on the streams of namely Cu first cleaner concentrate, Cu rougher concentrate and Cu third cleaner concentrate in terms of mineral recoveries and selectivity. Distribution of wash water rate to products was also determined by a tracer test method. Optimum operating conditions and accordingly performance of the column were determined by simulation studies. According to the results, the suitable streams for industrial scale flotation column are advised as the rougher concentrate and/or first cleaner concentrate. With series installation of columns, it is possible to obtain two different concentrates which include 22% Cu, 4% Zn and 17% Cu, 8% Zn without any decrease in overall recovery of plant.
Źródło:: Physicochemical Problems of Mineral Processing; 2019, 55, 2; 552-564
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Remediation of soils contaminated with trichloroethylene
Autorzy:: Albergaria, J. T.
Alvim-Ferraz, M. C. M.
Delerue-Matos, C. M.
Powiązania:: https://bibliotekanauki.pl/articles/363146.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:: szybkość przepływu powietrza
desorpcja próżniowa
zanieczyszczenie
gleba
zawartość wody
trichloroetylen
airflow rate
soil vapor extraction
soil water content
trichloroethylene
Opis:: Soil contamination is a common problem in our society. Several activities introduce contaminants in soils affecting their quality and future utilization. In order to invert this situation and to avoid further spreading of the contaminant several remediation technologies could be used. For soils contaminated with trichloroethylene (TCE), Soil Vapor Extraction (SVE) can be an efficient remediation technology. It involves the application of vacuum to the soil matrix creating an airflow that conduce the volatized contaminant to extraction wells that lead them to the exterior of the soil where they are properly treated. This work presents the results obtained in the soil vapor experiments performed in a laboratory using soils with different water contents contaminated with TCE. These experiments aimed the study of the influence of soil water content and the airflow used in the remediation time and on the process efficiency. The results showed that in sandy soils contaminated with TCE: a) for similar levels of contamination, the increase of the soil water content from 0 to 4% created an increase of the concentration of TCE in the gas phase of the soil, in some cases by almost 50%; b) the influence of water content is not significant being overlapped by influence of the airflow rate; c) SVE performed with higher airflow rates had shorter remediation times (in some cases four times shorter) without any significant impact on the process efficiencies (fluctuations of 1 to 3%); and d) for the experimented soils, the utilization of higher airflow rates led to shorter and consequently cheaper remediation.
Źródło:: Environmental Biotechnology; 2010, 6, 2; 37-41
1734-4964
Pojawia się w:: Environmental Biotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Emisja amoniaku i dwutlenku węgla z obór przeznaczonych dla krów mlecznych
Ammonia and carbon dioxide emissions from the dairy cattle barns
Autorzy:: Mazur, K.
Powiązania:: https://bibliotekanauki.pl/articles/239270.pdf
Data publikacji:: 2012
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: amoniak
dwutlenek węgla
emisja
gazy cieplarniane
przepływ powietrza
wentylacja naturalna
dairy cattle barns
ammonia
carbon dioxide
emissions
greenhouse gases
airflow rate
natural ventilation
Opis:: W pracy przedstawiono wyniki pomiarów emisji amoniaku i dwutlenku węgla z sześciu obór dla krów mlecznych, w tym dwóch boksowych ściółkowych, dwóch na głębokiej ściółce, jednej z podłożem samospławialnym oraz jednej boksowej bezściółkowej, zlokalizowanych na terenie województw lubelskiego, mazowieckiego i podlaskiego. Badania prowadzono w okresach letnim i zimowym. Wentylacja w oborach była naturalna (przez szczelinę kalenicową), w związku z tym emisję szkodliwych gazów z obór badano metodami bilansowymi (bilans dwutlenku węgla oraz wilgotności). W celu obliczenia wskaźnika przepływu powietrza zbadano: stężenie dwutlenku węgla, amoniaku oraz temperaturę i wilgotność względną powietrza wewnątrz i na zewnątrz obór. Mierzono poziom emisji gazów w ciągu doby. Średnia dobowa emisja amoniaku wahała się od 0,51 do 2,64 g·h-1·DJP-1, natomiast dwutlenku węgla od 223,9 do 962,6 g·h-1·DJP-1, w zależności od systemu utrzymania i pory roku. Największą emisję amoniaku latem (2,64 g·h-1·DJP-1) stwierdzono w oborze boksowej z płytką ściółką, z najmniejszą obsadą. Obora boksowa, bezściółkowa była budynkiem, w którym odnotowano największą emisję amoniaku zimą oraz drugą pod względem wielkości emisję amoniaku i dwutlenku węgla latem. Emisja amoniaku zimą w tej oborze wynosiła 1,47 g·h-1·DJP-1, natomiast emisja CO2 latem - 585,76 g·h-1·DJP-1.
The scope of research dealt with the emissions of ammonia and carbon dioxide in six dairy cattle barns: two with littered boxes, two on the deep litter, one with self-flushing floor and one with the litterless boxes. The objects tested were located in Lubelskie, Mazowieckie and Podlaskie provinces. Investigations were conducted during summer and winter seasons. All buildings were equipped with natural ventilation (through the roof ridge gap). Gaseous emissions from the cattle barns were determined by using balance methods (balance of carbon dioxide and air humidity). In order to calculate the ventilation rate, carbon dioxide and ammonia concentrations were measured, as well as the temperature and relative humidity of air inside and outside of the cattle barn buildings. The rates of gaseous emissions were measured over 24 hrs. Average ammonia emission (per 24 hrs) ranged within 0.51-2.64 g·h-1 LU, whereas the carbon dioxide within 223.9-962.6 g·h-1 LU, depending on the housing system and season of year. The highest ammonia emission in summer (2.64 g·h-1 LU) took place in the cattle barn with shallow-littered boxes and the smallest livestock density. The cattle barn with litterless boxes was characterized by highest ammonia emission in winter; it also took a second place in respect of both, ammonia and carbon dioxide emissions in the summer. Ammonia emission in this cattle barn in winter amounted to 1.47 g·h-1 LU, whereas CO2 emission in the summer - 585.76 g·h-1 LU.
Źródło:: Problemy Inżynierii Rolniczej; 2012, R. 20, nr 4, 4; 141-150
1231-0093
Pojawia się w:: Problemy Inżynierii Rolniczej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Sensitivity analysis of the effect of airflow velocity on the thermal comfort in underground mines
Autorzy:: Roghanchi, P.
Kocsis, K.
Sunkpal, M.
Powiązania:: https://bibliotekanauki.pl/articles/92169.pdf
Data publikacji:: 2016
Wydawca:: Główny Instytut Górnictwa
Tematy:: underground mine environment
airflow velocity limit
sweat rate
skin wetness
tolerable exposure time
ograniczenie prędkości przepływu powietrza
intensywność pocenia
wilgotność skóry
tolerowalny czas ekspozycji
Opis:: Displeasure in respect to air volumes and associated airflow velocities are well-documented complaints in underground mines. The complaints often differ in the form that there is too little airflow velocity or too much. In hot and humid climates such as those prevailing in many underground mines, convection heat transfer is the major mode of heat rejection from the human body, through the process of sweat evaporation. Consequently, the motion of the mine air plays a pivotal role in aiding this process. In this paper, a method was developed and adopted in the form of a “comfort model” to predict the optimum airflow velocity required to maintain heat comfort for the underground workforce at different activity levels (e.g. metabolic rates). Simulation analysis predicted comfort limits in the form of required sweat rate and maximum skin wetness. Tolerable worker heat exposure times were also predicted in order to minimize thermal strain due to dehydration. The results indicate that an airflow velocity in the range of 1 e2 m/s is the ideal velocity in order to provide a stress/strain free climate and also guarantee thermal comfort for the workers. Therefore, an optimal airflow velocity of 1.5 m/s for the miners' thermal comfort is suggested.
Źródło:: Journal of Sustainable Mining; 2016, 15, 4; 175-180
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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