Wyniki wyszukiwania - BazTech

1

Diagnostyka tłokowa gazociągów przesyłowych

Osiadacz Andrzej Janusz

Gaz, Woda i Technika Sanitarna

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2022

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Nr 3

2--11

PL

Uruchomienie inteligentnego tłoka w gazociągu to ważny projekt, który może mieć potencjalne konsekwencje dla bezpieczeństwa i eksploatacji. Każda operacja tłokowania powinna być starannie zaplanowana, aby upewnić się, że używane jest właściwe narzędzie, że przeprowadzono odpowiednie czyszczenie rurociągu a tłok nie utknie. W artykule podano niezbędne informacje dotyczące tłoków i zasad tłokowania.

EN

Running an intelligent pig in a pipeline is a significant project with potential safety and operational implications. Any pigging operation should be carefully planned to ensure that the correct tool is used, that appropriate pipeline cleaning is carried out and the pig will not get stuck. The paper provides necessary information concerning pigs and rules of pigging

2

Determination and application of pressure loss in long distance pipeline transportation of paste slurry based on pipe loop experiment

Sun Wei, Jiang Minggui, Fan Kai, Liu Zeng

Archives of Mining Sciences

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2022

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Vol. 67, no. 2

223--237

EN

Industrial size pipe loop tests were conducted to determine the effect of paste mass concentration, cement content, conveying pipe diameter and conveying volumetric flow rate, on the pipeline pressure loss of paste slurry. The tests were conducted to determine the pressure losses in the backfill system at a Copper Mines major ore body. Results show that the pressure loss of paste slurry increases with the increase in mass concentration, and when the mass concentration exceeds 70%, the pressure loss will increase sharply and would be an exponential function of paste mass concentration; as the cement content increases, the pressure loss would decrease at first and then increase with the maximum pressure loss at 11% cement content; the pressure loss increases with the increase in conveying the volumetric flow rate accordingly, while the growth rate of pressure loss will increase after the volumetric flow rate exceeds 50 m 3/h; the pressure loss of paste slurry decreases sharply with the increase in pipe diameter, i.e., the larger pipe diameter, the smaller pressure loss; lastly, the paste conveying parameters were determined as mass concentration of lower than 70% (pressure loss: 2.55 MPa/km), cement content of 5% to 11%, inside diameter of conveying pipe of 150 mm and the maximum allowable pipeline pressure of 6 MPa.

3

Calculation model of pipeline resistance for cemented paste backfill considering thixotropy

Chang Yingjie, Zhang Youzhi, Gan Deqing, Wang Xinyi, Du Shuangcheng

Archives of Mining Sciences

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2022

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Vol. 67, no. 2

303--316

EN

The rheological behaviour of cemented paste backfill (CPB) has an important influence on the stability of its transportation in pipelines. In the present study, the time-dependent rheological behaviour of CPB was investigated to elucidate the effects of time and solid content. Experimental results showed that when CPB is subjected to a constant shear rate, the shear stress gradually decreases with time before finally stabilis ing. When the solid content was 60%~62%, a liquid network structure was the main factor that influenced the thixotropy of CPB, and the solid content had less influence. When the solid content was 64%~66%, a floc network structure was the main factor that influenced the thixotropy of CPB, and the solid content had a more significant influence on the thixotropy than the shear rate. The initial structural stability of CPB increased with the solid content, and this relationship can be described by a power function. Based on the experimental results, a calculation model of pipeline resistance considering thixotropy was proposed. The model was validated by using industrial experimental data. The current study can serve as a design reference for CPB pipeline transportation.

4

Characteristics of fans used in low-power boilers

Bartoszewicz J., Nygard A., Urbaniak R.

Journal of Power Technologies

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2017

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Vol. 97, nr 1

69--74

EN

This paper presents the results of tests conducted in the Chair of Thermal Engineering of Poznan University of Technology dedicated to determining the efficiency of low-power barrel fans, which are used in low-power boilers. Operation parameters of fans produced for industry were checked with respect to the requirements of Directive 2009/125/EC of the European Parliament. The tests were used to determine the efficiency of fans and to compare them against values determined according to the European Directive. The test results are presented on graphs as functions of air volume flow. Those characteristics comprise distributions of total pressure, electric power absorbed by the motor, and fan efficiency. The results indicate that there is a need to develop new guidelines. They should concern those efficiencies of low-power fans which are not covered by Directive 2009/125/EC of the European Parliament.

5

The study of unsteady operation mode of the crude oil trunk pipeline in case of a sudden stop flow

Fąfara Z., Mazur R., Matuła R.

AGH Drilling, Oil, Gas

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2017

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Vol. 34, no. 2

349--360

EN

Media pipeline transportation, in particular energy commodities has a very high share in the world economy. It has many advantages over other methods of transmission of the products on land but there are concerns about the safety of the pipeline system. When we are designing the pipeline, we take into consideration maximal discharge pressure of medium, but any change in pumping parameters results the appea rance of an unsteady (transient) process, which in some cases may lead to a rapid increase in pressure. The largest increase in pressure in the pipeline comes at a time of a complete stop fluid flow. There is formed a water hammer, which may cause a major accident up to pipeline leaks inclusive. Subject of considerations in the paper is the analysis of changes in pressure over time in the pipeline obtained in 12 experiments of stop oil pump unit in the trunk pipeline for different pumping parameters and properties of the medium. Based on the recorded changes of pressure in measurement points were fitted regression models allowing to forecast an increase in pressure along the pipeline route caused by water hammer.

6

Low-power fans as a source of energy in pipeline transportation

Nygard A., Bartoszewicz J., Kłosowiak R., Urbaniak R.

Journal of Mechanical and Transport Engineering

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2015

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Vol. 67, No. 4

37--50

EN

This paper presents results of experimental tests conducted in the Chair of Thermal Engineering of Poznan University of Technology dedicated to determination of efficiency of low-power barrel fans. Operation parameters of fans produced for industry were checked with respect to the requirements of Directive 2009/125/EC of the European Parliament. Experimental tests allow determining the efficiency of fans and comparing them to values determined according to the European Directive. Test results are presented on graphs as functions of air volume flow. Those characteristics comprise distributions of total pressure, electric power absorbed by the motor and fan’s efficiency. Obtained results indicate that there is a need to develop new guidelines. They should concern those efficiencies of low-power fans which are not covered by Directive 2009/125/EC of the European Parliament.

PL

W artykule przedstawiono wyniki badań eksperymentalnych, prowadzonych w Katedrze Techniki Cieplnej Politechniki Poznańskiej, mających na celu wyznaczenie sprawności wentylatorów bębnowych małej mocy. Zgodnie z dyrektywą Parlamentu Europejskiego numer 2009/125/WE, sprawdzono parametry pracy wentylatorów produkowanych na potrzeby przemysłu. Badania eksperymentalne pozwoliły określić sprawność maszyn i porównać ją z wartościami wyznaczonymi zgodnie z dyrektywą unijną. Wyniki badań przedstawiono na wykresach w funkcji strumienia objętości przepływającego powietrza. Charakterystyki obejmują rozkłady ciśnienia całkowitego, mocy elektrycznej pobieranej przez napęd oraz sprawności wentylatora. Uzyskane wyniki wskazują na konieczność opracowania nowych wytycznych uwzględniających sprawność osiąganą przez wentylatory małej mocy, nieujęte w rozporządzeniu Parlamentu Europejskiego numer 2009/125/WE.

7

The Analysis of Pipeline Transportation Process for CO2 Captured From Reference Coal-Fired 900 MW Power Plant to Sequestration Region

Witkowski A., Rusin A., Majkut M., Stolecka K.

Chemical and Process Engineering

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2014

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Vol. 35, nr 4

497--514

EN

Three commercially available intercooled compression strategies for compressing CO2 were studied. All of the compression concepts required a final delivery pressure of 153 bar at the inlet to the pipeline. Then, simulations were used to determine the maximum safe pipeline distance to subsequent booster stations as a function of inlet pressure, environmental temperature, thickness of the thermal insulation and ground level heat flux conditions. The results show that subcooled liquid transport increases energy efficiency and minimises the cost of CO2 transport over long distances under heat transfer conditions. The study also found that the thermal insulation layer should not be laid on the external surface of the pipe in atmospheric conditions in Poland. The most important problems from the environmental protection point of view are rigorous and robust hazard identification which indirectly affects CO2 transportation. This paper analyses ways of reducing transport risk by means of safety valves.

8

Analysis of pipeline transportation systems for carbon dioxide sequestration

Witkowski A., Majkut M., Rulik S.

Archives of Thermodynamics

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2014

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Vol. 35, no. 1

117--140

EN

A commercially available ASPEN PLUS simulation using a pipe model was employed to determine the maximum safe pipeline distances to subsequent booster stations as a function of carbon dioxide (CO2) inlet pressure, ambient temperature and ground level heat flux parameters under three conditions: isothermal, adiabatic and with account of heat transfer. In the paper, the CO2 working area was assumed to be either in the liquid or in the supercritical state and results for these two states were compared. The following power station data were used: a 900 MW pulverized coal-fired power plant with 90% of CO2 recovered (156.43 kg/s) and the monothanolamine absorption method for separating CO2 from flue gases. The results show that a subcooled liquid transport maximizes energy efficiency and minimizes the cost of CO2 transport over long distances under isothermal, adiabatic and heat transfer conditions. After CO2 is compressed and boosted to above 9 MPa, its temperature is usually higher than ambient temperature. The thermal insulation layer slows down the CO2 temperature decrease process, increasing the pressure drop in the pipeline. Therefore in Poland, considering the atmospheric conditions, the thermal insulation layer should not be laid on the external surface of the pipeline.

9

Technical and economic issues of offshore pipeline carbon dioxide transportation

Włodek T., Kuczyński S., Hendel J.

AGH Drilling, Oil, Gas

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2014

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Vol. 31, no. 2

341--354

EN

The technical and economic conditions of carbon dioxide offshore pipeline transportation are presented in this paper. The basie conditions in which carbon dioxide will be transported, as well as the thermodynamic conditions, physicochemical properties and technical parameters, relevant to CO2 pipeline transport, are addressed in this article. The basie costs of pipeline carbon dioxide transport are also considered. The carbon dioxide flow was simulated for a few pipeline diameter sizes to determine the operating pressure of the pipeline for various maximum mass flow rate values. Different conditions of CO2 flow including impact of ambient conditions were analyzed. There is also included an analysis of technological systems and installation concepts for carbon dioxide preparation for efficient pipeline transportation.

10

Dywersyfikacja dostaw ropy naftowej do Polski transportem morskim i przesyłowym

Filina-Dawidowicz L., Kozłowska A.

Logistyka

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2012

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nr 6

PL

Artykuł przedstawia koncepcje dywersyfikacji dostaw ropy naftowej do Polski. Scharakteryzowany został rynek dostaw tego surowca do kraju. Określono czynniki wpływające na wielkość przewozów ropy naftowej. Opracowano scenariusze dostaw ropy do Polski transportem morskim i przesyłowym oraz zaproponowano koncepcje dywersyfikacji dostaw surowca do kraju. Stwierdzono, że należy poszukiwać nowych tanich dostawców oraz wykorzystywać istniejący potencjał przeładunkowy polskich terminali morskich.

EN

The paper presents the concept of crude oil supply diversification to Poland. The crude oil supply routes to the country were characterized. The factors related to the volume of the crude oil transportation were defined. The scenarios of crude oil supply to Poland by maritime and pipeline transport were developed. The conception of oil supplies diversification to the country was proposed. It was found that it is neccessary to look for the new low-cost suppliers and to use existing handling potential of Polish seaports.