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Date submitted2023-10-03
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Date accepted2024-11-07
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Date published2025-02-25
Investigation of the effectiveness of the use of various substances for dust suppression during the transshipment of granular sulfur
The article is devoted to the problem of dusting during the transshipment of granular sulfur and existing methods of dust suppression. The analysis of various methods for reducing dust emission at granulated sulfur storage and transportation facilities is presented. The necessity of using special reagents to increase the efficiency of dust suppression and re-granulation of sulfur crushed by abrasion is noted. The sulfur dust obtained from the port terminal during the transshipment of technical sulfur was analyzed for granulometric composition. The results of experimental studies of the effectiveness of the use of various substances for sulfur dust suppression (alkyl polyglycosides, sodium silicate, starch) are presented. The laboratory installation was a hopper, inside which a test sample of dusty material was placed. The sample was subjected to an aerodynamic effect by an air flow at a given speed. The concentrations of suspended solids were measured with a dust meter-nephelometer with a sampling tube placed in the geometric center of the hopper. The effectiveness of dust suppression agents was determined based on a comparison of the concentration values obtained on dry and treated samples. For dust suppression at granulated sulfur treatment facilities, it is proposed to use a composition based on nonionic surfactants represented by a mixture of C12-14-alkylglycosides oligomers (1-1.5 %), additionally containing a mixture of amylose and amylopectin polysaccharides in the form of soluble starch (1-2.5 %) and water. The dust suppressor showed consistently high dust suppression efficiency both when measured immediately after irrigation (98.3 %) and after the expected time (99.7 %). The developed composition provides an increase in the dust-suppressing ability of the solution and the elimination of the possibility of repeated dusting due to the formation of a polymer film on the surface, as well as the regranulation of the product crushed by abrasion.
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Date submitted2024-05-28
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Date accepted2024-11-07
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Date published2024-12-25
Methods of intensification of pipeline transportation of hydraulic mixtures when backfilling mined-out spaces
The paper presents an analysis of the advantages and limitations of additional measures to intensify the transportation of the backfill hydraulic mixture flow. The results of the analysis of the conditions for using pumping equipment to move flows with different rheological properties are shown. Generalizations of the methods for influencing the internal resistance of backfill hydraulic mixtures by means of mechanical activation, as well as increasing fluidity due to the use of chemical additives are given. The article presents the results of studies confirming the feasibility of using pipes with polymer lining, which has proven its efficiency in pumping flows of hydraulic mixtures with different filler concentrations. An analytical model of hydraulic mixture movement in the pipeline of the stowage complex has been developed. The trends in pressure change required to ensure the movement of hydraulic mixture in pipelines of different diameters are exponential, provided that the flow properties are constant. The effect of particle size on the motion mode of the formed heterogeneous flow, as well as on the distribution of flow density over the cross-section, characterizing the stratification and change in the rheological properties of the backfill hydraulic mixture, is assessed. An analytical model of centralized migration of the dispersed phase of the hydraulic mixture flow is formulated, describing the effect of turbulent mixing of the flow on the behavior of solid particles. An assessment of the secondary dispersion of the solid fraction of the hydraulic mixture, which causes a change in the consistency of the flow, was performed. The studies of the influence of the coefficient of consistency of the flow revealed that overgrinding of the fractions of the filler of the hydraulic mixture contributes to an increase in the required pressure in the pipeline system.
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Date submitted2024-05-03
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Date accepted2024-10-14
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Date published2024-11-12
Genetic geological model of diamond-bearing fluid magmatic system
The article proposes a genetic geological model of diamond deposit formation associated with kimberlites and lamproites. It is based on the synthesis of published data on diamond-bearing kimberlite systems and an original study of the ontogenetic features of diamond crystals. Deep diamond crystallization, its upward transportation and subsequent concentration in near-surface kimberlite-lamproite bodies and other rocks, including those brought to the surface by high-amplitude uplifts of crystalline basement rocks, are combined in a single system. An assumption is made about the primary sources of the Anabar placer diamonds. The possibility of hydrocarbon generation at mantle levels corresponding to diamond formation areas and their transportation to the upper crustal zones by a mechanism similar to the mantle-crust migration of diamond-bearing fluidized magmas is shown. The high rate of their upward movement allows transportation to the surface without significant loss as a result of dissolution in melts and sorption on the surface of mineral phases. The significant role of fluid dynamics at all stages of this system is noted.
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Date submitted2024-06-17
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Date accepted2024-07-17
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Date published2024-10-03
Justification on the safe exploitation of closed coal warehouse by gas factor
The annual increase of coal production and its demand lead to the necessity in temporary storage places (warehouses) organization to accommodate raw coal materials before the shipment. It is noted that at the open method of coal storing the dust emission from loading/unloading operations and from the pile surface effects negatively the health of the warehouse workers and adjacent territories. An alternative solution is closed-type warehouses. One of the main hazards of such coal storage can be the release of residual methane from coal segregates into the air after degassing processes during mining and extraction to the surface, as well as transportation to the place of temporary storage. The study carries the analysis of methane content change in coal during the processes of extraction, transportation and storage. Physical and chemical bases of mass transfer during the interaction between gas-saturated coal mass and air are studied. It is determined that the intensity of methane emission depends on: the coal seam natural gas content, parameters of mass transfer between coal, and air and the ambient temperature. The dynamics of coal mass gas exchange with atmospheric air is evaluated by approximate approach, which is based on two interrelated iterations. The first one considers the formation of methane concentration fields in the air space of the bulk volume and the second accounts the methane emission from the pile surface to the outside air. It is determined that safety of closed coal warehouses exploitation by gas factor can be ensured by means of artificial ventilation providing volumetric methane concentration in the air less than 1 %. The flow rate sufficient to achieve this methane concentration was obtained as a result of computer modeling of methane concentration fields formation in the air medium at theoretically calculated methane emission from the pile surface.
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Date submitted2022-03-24
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Date accepted2022-07-21
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Date published2022-12-29
A probabilistic study on hole cleaning optimization
- Authors:
- Seyyed Shahab Tabatabaee Moradi
Hole cleaning is considered as one of the most important drilling fluid functions. An efficient hole cleaning ensures a reliable well drilling practice with minimum troublesome problems. In this study, two main steps of hole cleaning, i.e., cuttings removal from under the bit and cuttings transport to the surface are discussed based on the drilling data of a shale formation. The traditional models for optimization of each step are presented. As the models require variety of input data, which are usually subjected to some extent of errors and uncertainties, the output of the model is also an uncertain parameter. Using Monte Carlo simulation, a simple probabilistic study was conducted to quantify the certainty level of the obtained results. Based on the result of this study, it is shown that for the proposed well, a good hole cleaning is expected. However, a more reliable decision for further hole cleaning optimization should be made considering the results of uncertainty analysis.
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Date submitted2022-05-17
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Date accepted2022-09-06
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Date published2022-11-03
On the need to classify rock mass fed to dry magnetic separation
The hypothesis of a possible use of dry magnetic separation is substantiated on the example of ores from ferruginous quartzite deposits operated by plants of PAO “Severstal” Holding. Size class of ore after medium crushing is –80+0 mm when the vibrating feeder is used for feeding ore mass to the separation zone. The rationale is based on the analysis of video recording of physical simulation on a laboratory drum magnetic separator of SMBS-L series, in the VSDC Video Editor, and simulation modelling of dry magnetic separation on its virtual prototype in Rocky DEM software package. It has been proved that the use of a vibrating feeder for feeding the material to the working area of a magnetic separator makes it possible to: form a monolayer on the surface of the vibrating feeder chute with a thickness close to the maximum size of a lump of separated ore; implement batch feed of material to the separation zone; increase the spacing between lumps in the separation zone when passing through the free fall area, thereby allowing dry magnetic separation of ferruginous quartzites of size class –80+0 mm without pre-preparation.
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Date submitted2021-02-28
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Date accepted2021-11-30
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Date published2021-12-27
Substantiation of analytical dependences for hydraulic calculation of high-viscosity oil transportation
- Authors:
- Alexander K. Nikolaev
- Natalia А. Zaripova
One of the development priorities in oil and gas industry is to maintain gas and oil pipeline networks and develop pipeline-connected gas and oil fields of the Arctic zone of the Russian Federation, a promising region the resource potential of which will not only meet a significant portion of internal and external demand for various types of raw materials and primary energy carriers, but will also bring great economic benefits to subsoil users and the state. The mineral and raw material centers of the Nadym-Purskiy and Pur-Tazovskskiy oil and gas bearing areas are among the most attractive regions of the Arctic zone. It is necessary to develop a scientifically substantiated approach to improve the methods of oil transportation from the field to the existing pipelines. As it is known, the task of increasing the efficiency of pipeline transportation of high-viscosity oil is inseparably connected with solving problems in the field of thermal and hydraulic calculation of pipeline system. The article presents the substantiation of dependencies for hydraulic calculation of pipelines transporting high-viscosity oil exhibiting complex rheological properties. Based on the laws of hydraulics for non-Newtonian fluids, the formulas for calculating head losses for fluids obeying Ostwald's law are proposed, their relationship to the classical equations of hydraulics is shown. The theoretical substantiation of looping installation for increasing the efficiency of pipeline transportation of high-viscosity oil taking into account the received dependences for power fluid is considered.
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Date submitted2020-05-13
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Date accepted2021-05-21
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Date published2021-09-20
Increasing the efficiency of technological preparation for the production of the manufacture components equipment for the mineral resource complex
An increase of components production for the equipment intended for oil and gas production is a key factor for analyzing existing technological processes and searching for new technological solutions to improve the efficiency of the production process and the quality of components. The article presents a simulation model designed to determine the rational technological processing parameters for the production of the “Centralizer shell” part. The basis for optimizing the working cycle of a production line is synchronization based on the principle of proportionality, which involves equalizing the duration of all technological operations with the rhythm of the production line. Synchronization of technological operations on the production line is carried out by choosing rational cutting parameters for each technological transition (cutting speed, feedrate, number of working passes). The “Centralizer shell” part is made of titanium alloy VT16, which has high strength, corrosion resistance and ductility. For the part under consideration, the permissible values of the cutting parameters were determined based on the calculation of the total processing error, as well as the frequency of replacement of the worn cutting tool. The simulation model described in the article made it possible to increase the efficiency of the production process due to the synchronization of technological operations and the search for rational technological parameters, as well as to improve the manufacturing quality of the “Centralizer shell” part by analyzing the processing error at various parameters of the technological process.
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Date submitted2020-06-12
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Date accepted2020-06-15
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Date published2020-12-29
Analysis of project organization specifics in small-scale LNG production
- Authors:
- Pavel S. Tcvetkov
- S. V. Fedoseev
Gas industry plays an important role in the global energy sector, and in the coming decades amountsof natural gas production will only increase. One of the fastest growing trends in gas industry is the production of liquefiednatural gas (LNG), which is associated with the necessity to organize flexible systems of gas supply to the regions,remote from gas extraction sites. Industrial structure of LNG production includes projects, belonging to several different groups depending to their scale, in particular, small-scale production (SSLNG), cumulative production capacityof which is approximately 10 % from the industry-wide one. Economic aspects of implementing such projects remainunderexplored, which does not allow to draw objective conclusions regarding the prospects of their implementationin particular regions.This paper contains a review of publications, devoted to SSLNG project studies, aimed at identifying specifics oftheir organization compared to projects of greater scale. The results demonstrate that the majority of internationalcompanies classify projects as SSLNG, if their annual production capacity is below 0.5 million tonnes per annum.Specific capital costs, as well as implementation timelines of such projects, are several times lower than those of projects with greater production capacity, which reduces their risks and minimizes barriers to market entry. Furthermore,SSLNG is the most decentralized subsector in gas industry, aiming to cover the market due to a growing numberof projects, not their specific production capacity. These specific features define significant prospects of SSLNGdevelopment in Russia, both in the context of energy supply to remote regions and diversification of export deliveries.
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Date submitted2020-05-25
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Date accepted2020-06-11
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Date published2020-12-29
Technological aspects of cased wells construction with cyclical-flow transportation of rock
- Authors:
- Andrei S. Kondratenko
A high-performance technology for constructing cased wells is proposed. Essence of the technology is the advance insertion of the casing pipe into the sedimentary rock mass and the cyclical-flow transportation of the soil rock portions using the compressed air pressure supplied to the open bottomhole end of the pipe through a separate line. Results of mathematical modeling for the process of impact insertion of a hollow pipe into a soil mass in horizontal and vertical settings are considered. Modeling of the technology is implemented by the finite element method in the ANSYS Mechanical software. Parameters of the pipe insertion in the sedimentary rock mass are determined - value of the cleaning step and the impact energy required to insert the pipe at a given depth. Calculations were performed for pipes with a diameter from 325 to 730 mm. Insertion coefficient is introduced, which characterizes the resistance of rocks to destruction during the dynamic penetration of the casing pipe in one impact blow of the pneumatic hammer. An overview of the prospects for the application of the proposed technology in geological exploration, when conducting horizontal wells of a small cross-section using a trenchless method of construction and borehole methods of mining, is presented. A variant of using the technology for determining the strength properties of rocks is proposed. Some features of the technology application at industrial facilities of the construction and mining industry are considered: for trenchless laying of underground utilities and for installing starting conductors when constructing degassing wells from the surface in coal deposits. Results of a technical and economic assessment of the proposed technology efficiency when installing starting conductors in sedimentary rocks at mining allotments of coal mines are presented.
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Date submitted2019-07-21
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Date accepted2019-09-20
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Date published2020-02-25
Assessment of operational reliability of quarry excavator-dump truck complexes
- Authors:
- V. M. Kurganov
- M. V. Gryaznov
- S. V. Kolobanov
The method proposed in the article is based on the mathematical apparatus for quantitative assessment of the reliability of majority schemes of structural redundancy of transport processes, which provide the availability and usage of several backup delivery channels in the transport process in case of any malfunction. The principle of multi-channel haulage is commonly used in quarries for transportation of overburden and minerals from benches by dump trucks, when excavators and dump trucks performing cyclic operations function as a single excavator-dump truck complex. This pattern of work significantly increases the likelihood of fulfilling the daily plan for transporting rock mass due to the redistribution of dump trucks between mining and overburden excavators in the event of failure of one or more units of mining and handling equipment. The reliability of excavator-dump truck complexes is assessed in three stages: initial data collection for mathematical modeling of excavator-dump truck complex performance; solving the problem of optimizing the distribution of dump trucks between excavators, ensuring maximum productivity of the excavator-dump truck complex; assessment of the reliability of its work depending on the probability of fulfilling the daily plan for the transportation of rock mass. The proposed method is implemented as part of a computer program and makes it possible to automate the operational management of the process of transporting rock mass in a quarry using a mobile application. The developed guidelines can be used for any quarries with automobile transport, regardless of the type of mineral extracted, the mining method, the loading pattern, the capacity of the excavation and loading equipment fleet, and the capacity of operated dump trucks.
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Date submitted2019-07-24
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Date accepted2019-09-13
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Date published2019-12-24
Integrated mining projects in underdeveloped territories of Russia: substantiation of implementation parameters
- Authors:
- T. V. Ponomarenko
- E. A. Khan-Tsai
- Ch. Bavuu
Complex mining projects, as a rule, have significant economic and social impact on the territory, sometimes entire regions where they are implemented. Consumers of their implementation effects are population, government, buyers, lenders and other stakeholders. Therefore, development of transport infrastructure in integrated projects for development of mineral deposits should have state support, forms of which are very diverse. In Russia parameters of concession agreements for construction of transport infrastructure, carried out in conjunction with projects for development of mineral deposits, are not regulated or justified. Aim of the work is to develop an organizational model and justify parameters of concession agreement for construction of the railway as a key element of transport infrastructure necessary for successful implementation of the project for development of a large coal deposit in a low-developed region. Research methods are: strategic, institutional, investment analysis, modeling and forecasting methods. The article proposes an approach to justification of technical, economic and financial parameters of concession agreement implemented during realization of an integrated mining project. As a result of the study, a concession agreement model was developed for construction of railway section as part of an integrated mining project, including development of a deposit and construction of a mining and concentrating company.
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Date submitted2019-07-06
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Date accepted2019-08-25
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Date published2019-12-24
Improving the efficiency of technological preparation of single and small batch production based on simulation modeling
Technological preparation of production is an integral stage of the production process, which is characterized by high complexity, which is largely felt in the conditions of single and small-scale types of production. The effectiveness of technological preparation of production is increased through automation with the use of simulation modeling. The objective of the study is to develop a simulation model that allows you to determine a rational version of the process for processing a batch of parts. The simulation model described in the article allows to analyze the production schedule of the enterprise, build processing routes, evaluate options for using various types of workpieces and technological equipment, determine the acceptable values of cutting conditions, and choose a rational variant of the technological process of processing a batch of parts. The developed simulation model is based on the principles of modular technologies, the part is considered as a combination of individual elementary surfaces. Each elementary surface contains information about the technological processing route, technological equipment and the type of technological equipment used in its manufacture, cutting conditions and the size of the allowance for each processing stage. The rational choice of the technological process is selected on the basis of multicriteria analysis according to three criteria: the value of variable costs, the production time of a batch of parts and the value of the processing error. The analysis of these criteria is made and the parameters that have the greatest impact on their value are determined. The developed classification of surface elements is described: design elements, technological elements, basic elements, as well as a mathematical model based on which the calculation of the values of the criteria for choosing a rational option.
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Date submitted2018-12-30
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Date accepted2019-03-01
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Date published2019-06-25
The concept of development of monitoring systems and management of intelligent technical complexes
Conceptual approaches to improving the system of monitoring and managing the functional capabilities of intelligent technical complexes of buildings and transport and technological machines of mining enterprises are defined. Criteria are proposed for the efficiency of functioning of automatic systems for controlling the movement of transport-technological machines, taking into account the probabilistic nature of system-forming factors. The scheme of scientific and methodological research on the improvement of automation systems and traffic control in the automotive transport is presented. The perspective directions of the formation of control functions for the movement of vehicles based on the use of intelligent automated systems are substantiated. The stages of the life cycle of technical systems for monitoring the movement of vehicles, taking into account the features of their operation. A technique has been developed for the optimal use of technical means of control in the field of providing control and supervisory functions in the operation of vehicles, and the dependence of determining the financial costs of maintaining their efficiency has been determined.
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Date submitted2018-05-07
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Date accepted2018-07-10
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Date published2018-10-24
Justification of economic benefits of arctic LNG transportation by sea
Russian Arctic is the largest exporter of domestic natural gas, which brings significant income to the federal budget. The major share of natural gas extracted in the Arctic is transported via pipelines in the direction of European countries. For a number of reasons EU is continuously reducing its consumption of Russian natural gas, among other things by increasing the import of liquefied natural gas (LNG). All this is happening against the background of global markets refocusing from pipeline gas to LNG. An obvious solution here would be to increase LNG production in the Russian Arctic with its subsequent transportation by sea. Taking into account remote location of Arctic gas fields from the main sales markets, there is a need for comparative cost analysis of transportation via pipelines and LNG tankers. The authors developed a method of assessing the costs of pipeline and sea transportation under comparable conditions. Calculations have been made for gas transportation to Germany, Italy, Turkey and China. As a result, it has been demonstrated that sea transportation of 1,000 m 3 of natural gas is cheaper than pipeline transportation by the average value of 106.3 USD (–40.2 %) across all the routes in question. Performed calculations prove the economic benefits of sea transportation of Arctic LNG to the existing and potential markets for natural gas. Such results are justified by the need of rational replacement of pipeline gas by LNG in European markets (especially in Southern Europe, where LNG has a greater competitive advantage) and increasing export of liquefied natural gas to the Asia-Pacific Region. Suggested measures will allow to reduce the costs of sea LNG transportation, which will give Arctic natural gas a competitive edge on the global and regional gas markets.
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Date submitted2018-05-07
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Date accepted2018-07-06
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Date published2018-10-24
Hydraulic transportation of thickened tailings of iron ore processing at Kachkanarsky GOK based on results of laboratory and pilot tests of hydrotransport system
- Authors:
- V. I. Aleksandrov
- M. A. Vasileva
The object of study is the system of hydrotransport of iron ore processing tailings at JSC «EVRAZ Kachkanarsky GOK». The aim of the work was to determine the parameters of the hydraulic transport of tailings of the iron ore enrichment at weight concentrations of the solid phase from 30 to 70 % and to develop recommendations for the industrial operation of hydraulic transport systems of highly concentrated slurries of the Tailing Facilities of the Kachkanarsky GOK. Laboratory studies of the parameters of hydrotransport of thickened tail pulps were carried out with the development of a calculation method; pilot tests of the hydrotransport system under the conditions of the Tailing Facilities of the Kachkanarsky GOK. It has been established that using polyurethane coatings on the inner surface of the slurry lines significantly (1.75 times) decrease the specific pressure loss on the hydrotransport of thickened fluids. This allows to significantly increase the range of transportation for placing tailings in the distant parts of the storage zone. The introduction of research results is in the project of reconstruction and development of the tailing facility of the TF of the Kachkanarsky GOK for the period 2018-2020. It is proposed to use the results of work in the project of reconstruction of the hydraulic transport system at the TF of the Kachkanarsky GOK by switching to the hydraulic transport of slurries thickened to weight concentrations of 35-40 % in the slurry pipes with an internal polyurethane coating, which will ensure energy saving in the hydraulic transport process.
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Date submitted2016-11-17
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Date accepted2017-01-12
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Date published2017-04-14
Research on regimes of limonite ore hyrdotransport for the conditions of Perdo Soto Alba plant
- Authors:
- Raul' Isk'erdo Pupo
- Al'berto Turro Breff
The paper examines regular flow patterns of high-concentrated limonite pulp with significant content of finest grains. Engineering procedures have been developed to calculate basic parameters of limonite ore hydrotransport in turbulent and structured regimes. Trustworthiness of scientific statements, conclusions and recommendations is justified by theoretical research, establishment of analytical dependences, results of laboratory and industrial experiments. Practical regularities of behavior have been identified for the coefficient of hydraulic resistance, depending on pulp density in the range 35-45 % in case of pulp flow in structured regime, as well as regularity of pressure losses in case of pulp flow in horizontal and inclined pipelines in turbulent regime.
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Date submitted2016-09-15
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Date accepted2016-11-07
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Date published2017-02-22
Open-pit mining of lignin waste storage
- Authors:
- A. V. Mikhailov
The purpose of this paper is to develop performance criteria for fleet selection in surface mining of lignin as a raw material for factory-made fuel. The East Siberian Biotechnical Plant (ESBP) proposes to close the Lignin Waste Storage (LWS) at Tulun, Irkutsk Region of Russia. The LWS is a 9.6 ha facility used for the long-term storage of hydrolysis lignin and some fly ash. The project provided whole-year open-pit mining of lignin storage with one mining ledge within 3 years. Productivity – 1500 t/day or 447 000 t/year. Excavated lignin will be stockpile on the Pellet Plant territory for later processing. Part of this closure effort would involve constructing an artificial reservoir on the place of LWS. The objectives of this project were as follows: determine equipment needs and develop optimal procedures for the lignin excavation and transportation. Lignin moving may include site preparation, excavation, transportation and road surfacing. Lignin excavation is conduct by using techniques similar to those used for open-pit mining of peat. For this project, the excavator is the most important piece of equipment required for lignin removal and handling. The mining process consist of excavating the lignin (using Kraneks ЕК-270LC) and hauling it to pellet plant via six off-road tractors&semitrailers (John Deere 7730& ISON-8520).
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Date submitted2015-08-25
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Date accepted2015-10-01
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Date published2016-04-22
Vibrodiagnostics of the technical state slurry pumps
- Authors:
- V. I. Aleksandrov
- Irzhi Sobota
Analysis of the work hydrotransport systems in processing plants shows that the efficiency of this type transport does not match its technical capabilities: the high laboriousness involved in the operation of the equipment, high hydroabrasive wear of slurry pumps and pipelines, low working life pumps, high metal consumption and energy. The main reason for the lack of effectiveness of hydraulic transport is hydroabrasive wear impellers of slurry pumps, causing rising levels of vibra-tion pumps, reducing the pressure characteristics, general technical state of hydrotransport system and as a result - low pumps life, not exceeding 500 hours of continuous operation. In paper, it is shown that as a criterion of period normal operation slurry pump can be used coefficient of techni-cal state, the value of which is proportional to the relative head, degree of hydroabrasive wear of the impeller and time of continuous operating. The coefficient technical state of slurry pump can be represented as a function of current flow rate and the RMS value of vibration velocity. The re-sults of theoretical and experimental studies used to develop algorithms and techniques express-diagnosis and monitoring of slurry pumps in hydrotransport system, data which indicate the need for routine maintenance of pumping equipment.
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Date submitted2015-07-14
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Date accepted2015-09-28
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Date published2016-02-24
Selection of rational heating temperature for pipeline pumping high-viscosity and high pour point crude oil
- Authors:
- A. K. Nikolaev
- V. I. Klimko
The article deals with the transportation problems of high-viscosity and high pour point crude oil through pipelines. The possibility of a structural oil movement mode development during transportation below the pour point is analyzed. The results of the experiment for unevenness of the heat flux identification in the underground pipeline are given.
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Date submitted2014-12-29
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Date accepted2015-02-15
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Date published2015-12-25
A study of distillates physical and chemical properties and residues after thermodestructive and catalytic processes and their application in the mining industry
- Authors:
- N. K. Kondrasheva
- O. V. Zyrianova
When transporting overburden rocks in a cold season, the lower layer of materials freezes to working surfaces of transport equipment, and at long transportations – congeals under its own weight. As a result, up to 50 % of rock remains in the vehicle, while the unloaded part represents indiscreete frozen mass. It considerably complicates the process of unloading transport and leads to increased labor and financial expenses. A rational and effective remedy for these problems is transport equipment and bulk material processing with chemical agents of oil and petrochemical origin – mixtures of distillate and bottom frations obtained as a result of thermodestructive processes during petroleum feedstock manufacturing. The article presents data on the quality of distillates and residual products of oil recycling, which are used as initial components for producing preventive drugs, which are used to prevent sticking and freezing of overburden rocks during transportation and storage in the cold time of year, as well as drugs used for pit roads treatment in surface mining operations. Optimal component compositions of new petrochemicals are developed, and the physical and chemical properties of the received test samples have been studied.
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Date submitted2010-07-16
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Date accepted2010-09-11
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Date published2011-03-21
Parameters of high viscosity oils transportation in the form of emulsion research in order to its optimization
- Authors:
- V. I. Aleksandrov
- A. P. Khrabrov
The article deals with the physical model of high viscosity oil-in-water emulsion flow, which concern both structural and plastic properties of viscoplastic liquids. On the basis of theoretical study, which was proved with experimental data, computation algorithm of high viscosity oil in emulsion state pipeline transportation was developed.
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Date submitted2010-07-01
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Date accepted2010-09-23
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Date published2011-03-21
Improving the efficiency of system of deleting waste on Udachny GOK
- Authors:
- V. P. Dokukin
- A. A. Velnikovskiy
Examined ways to improve the efficiency of hydrotransport systems. A method for determining the most advantageous modes of GTP. The calculation of basic characteristics of the flow of pulp when the grain size, density and quantity released to the enrichment of solid material to installation hydrotransport concentrator.
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Date submitted2010-07-13
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Date accepted2010-09-13
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Date published2011-03-21
Actual ways of increasing the effectiveness of facilities for hydrotransport mountain companies
- Authors:
- A. A. Velnikovskiy
Shown the necessity of improving hydrotransport installations. Built a functional model of the hydrotransport system. As a result of its analysis identified the most relevant ways to improve efficiency of hydrotransport on mining enterprises.
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Date submitted2009-08-01
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Date accepted2009-10-29
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Date published2010-02-01
Increase of competitiveness of russian and belorussian potash companies owing to perfection of sale policy
- Authors:
- T. V. Ponomarenko
- A. N. Sultani
The potassium companies of Russia and Belorussia, developing the unique deposits of potassium salts, provide more than 40 % of the world production of potassium fertilizers. Therefore economic efficiency from their activity considerably influences to the world market of potassium. Being the companies which export more than 80 % producible products «Belaruskali», «Uralkali» and «Silvinite» have problems with the transport of fertilizers in Brazil, India, China. Therefore for the increase of competitiveness of these enterprises it is necessary to develop an effective logistic chain which would take into account their geopolitical features.