Calculation of pressure loss and critical velocity for slurry flows with additive agents in vertical polyethylene pipelines

Semenenko, Yevhen; Kril, S. I.; Medvedieva, Olha; Nykyforova, Nina; Tatarko, Larysa

doi:10.1051/e3sconf/201910900083

Cited by 7 publications

(7 citation statements)

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“…All of this demonstrates the importance of recycling. Therefore, the problem of waste should be considered as part of a unified approach to socio-environmental, resource and technological aspects, as a set of three components (problematic aspects) [10,11]:…”

Section: Methodsmentioning

confidence: 99%

Scientific substantiation of complex extraction and processing of secondary resources for the development of alternative sources of energy

Medvedieva,

Slobodiannykova

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Scientific research on the integrated extraction and processing of secondary resources, such as mine water, technogenic waste, and others, in order to develop alternative energy sources in the diversification of coal mines is an urgent scientific task that will help solve the issues on the economic, social and environmental transformation of coal mining regions. In practice, it is necessary to consider several alternative options and assess the possibility of obtaining different end products from the targeted processing of secondary raw materials. The choice of a rational processing option to obtain the target product is very complicated due to the different composition of the feedstock, as well as a significant variety of primary processing methods and parameters of intermediate processes, which causes certain difficulties in forecasts and calculations. Developing a methodology for typifying actions when choosing options for integrated processing of recyclable materials of different states, defining the basic principles and its structure for comparative analysis of the input, intermediate, and output parameters in terms of composition, physical, chemical, and technological characteristics are urgent modern tasks.

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Section: Methodsmentioning

confidence: 99%

Scientific substantiation of complex extraction and processing of secondary resources for the development of alternative sources of energy

Medvedieva,

Slobodiannykova

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The construction of graphical characteristics of hydraulic transport systems [26] in accordance with the design schemes of the accepted options for the mining and processing complex is carried out on the basis of known analytical dependencies [27], mathematical constants [28], and hydraulic characteristics [29]. The volumetric concentration of slurry adopted in the hydraulic calculations of the complex elements is limited to 10% in accordance with the recommendations for hydraulic mechanization systems during the mining and transportation of soil.…”

Section: Methodsmentioning

confidence: 99%

Substantiation of technological resource-saving conditions for the use of equipment in the sand deposit mining

Bondarenko,

Shustov,

Pavlychenko

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The mining and technological features of the Gusarovsky deposit of molding sands mining under the conditions of technological limitations of the existing enterprise have been studied. The granulometric composition of balance reserve sands, as well as overburden rocks, was analyzed. In order to obtain a high-quality commercial product with a minimum content of fine and clay particles from the initial rock mass of the surface and watered ledges, the parameters of the hydromechanized complex were substantiated by mining and processing. The calculation is based on the three most available options for filling the mining and processing complex (MPC). To substantiate the rational parameters of the MPC and ensure the purification of the commercial product from fine impurities, a graphical characteristic of the hydraulic vertical classifier GKCD2000 was constructed when supplying clean water and at a slurry concentration of 10%. The graphical characteristics of hydraulic transport systems were constructed in accordance with the design diagrams of the accepted variants of the complex. To substantiate the rational parameters of the pumping station, the characteristics of the mining and processing complex were constructed when pumping clean water and slurry at a concentration of 10%. For the first time, the rational parameters of the technological complex of mining and processing, consisting of a suction dredger – a transport slurry pipeline – and a vertical hydraulic classifier GKCD2000, have been substantiated. The development of a technological complex of mining and processing will allow the existing enterprise to continue developing the deposit and obtaining high-quality commercial products under the conditions of technological limitations.

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“…When the pipeline diameter is known, the density and concentration of the hydraulic mixture, the initial shearing stress and the structural viscosity of the suspension can be determined. Thereafter, by the formula (27), the possible hydraulic mixture supply is calculated, the value of which is compared with the regulated supply value. If the difference between the obtained values satisfies the calculation accuracy, then the calculations are terminated, if not, then the value q should be changed and the calculation is repeated anew.…”

Section: Figure 7 Approximation Of the Dependence Of Value B On Kmentioning

confidence: 99%

“…For low and mean-concentrated hydraulic mixtures, the finished pulp density control in this type of devices is ensured by selecting the volumetric flowrate of phases, and the uniformity of mixing is provided by ways of their supply. For hydraulic transport systems transporting hydraulic mixtures with such a concentration, several designs of jet sumps are known that provide a stable value of the pulp concentration [27]- [30]. Water filtration and soil deformations under above mentioned conditions must be also taken into consideration [31]- [33].…”

Section: Introductionmentioning

confidence: 99%

Parameters determination of hydromechanization technologies for the dumps development as technogenic deposits

Blyuss¹,

Semenenko²,

Medvedieva³

et al. 2020

Min. miner. depos.

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Purpose. Determination and substantiation of the hydromechanization technologies parameters and the hydraulic transport operation modes for mining the technogenic deposits formed as a result of the enrichment waste storing in tailing dumps of mining and processing enterprises. Methods. A comprehensive multi-stage analytical approach has been used in a paper when performing research. Initially, in order to substantiate the hydromechanization technologies parameters, the parameters of the pulp-preparation unit have been analytically determined in this paper, which are limited by the value of the upper dam edge, taking into account the types of hydraulic mixture. At the second stage, dependences have been set for calculating the critical velocity of hydraulic transporting the pulps with different concentration (low, mean, and high). The next research stage was to determine the head and rate specification (HRS) of the hydrotransport pipeline and the required capacity of the hydraulic mixture, which will enable substantiating the parameters for the corresponding mining complex in the technogenic deposits development. Findings. A critical pipeline diameter has been set with the prescribed parameters of the mining complex and the adopted pulp preparation system. Dependences have been found for calculating the critical velocity of hydraulic transportation of mean-and highly-concentrated pulps. The head and rate specifications have been determined of the tailing hydrotransport pipeline. Originality. For the first time it has been revealed that the critical diameter value is determined by the product of two termsthe first one takes into account the effect of the mining complex productivity, and the secondthe dependence on the pulp preparation system parameters. This makes possible to control the parameters and modes of hydromechanization technologies when mining technogenic deposits formed as a result of storing the enrichment waste in tailing ponds. Practical implications. The "Recommendations for substantiating the parameters of the processes of accumulating capacity restoring of a pond with the use of hydromechanization devices" and "Methods for calculating the parameters for hydraulic transportation of highly-concentrated hydraulic mixtures", have been developed, which may be useful for design organizations and mining-metallurgical enterprises to provide additional volumes of raw material output and increase the tailing ponds lifetime.

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Calculation of pressure loss and critical velocity for slurry flows with additive agents in vertical polyethylene pipelines

Cited by 7 publications

References 0 publications

Scientific substantiation of complex extraction and processing of secondary resources for the development of alternative sources of energy

Scientific substantiation of complex extraction and processing of secondary resources for the development of alternative sources of energy

Substantiation of technological resource-saving conditions for the use of equipment in the sand deposit mining

Parameters determination of hydromechanization technologies for the dumps development as technogenic deposits

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