Studies on energy consumption of crude oil pipeline transportation process based on the unavoidable exergy loss rate

Cheng, Qinglin; Zheng, Anbo; Lu, Yang; Chenlin, Pan; Liu, Yang

doi:10.1016/j.csite.2018.02.005

Cited by 13 publications

(4 citation statements)

References 4 publications

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“…In the process of pipeline transportation, the specific heat capacity of oil and viscous frictional resistance vary with temperature; thus, the oil pipeline is divided into temperature intervals according to the wax appearance point T sl , anomalous point T F and flow transition temperature T c , T MRc . Specifically [20][21][22]:…”

Section: Temperature Range Of Pipeline Transportationmentioning

confidence: 99%

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Unavoidable Destroyed Exergy in Crude Oil Pipelines due to Wax Precipitation

Cheng

Yang

Zheng

et al. 2019

Entropy

Self Cite

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Based on the technological requirements related to waxy crude oil pipeline transportation, both unavoidable and avoidable destroyed exergy are defined. Considering the changing characteristics of flow pattern and flow regime over the course of the oil transportation process, a method of dividing station oil pipelines into transportation intervals is suggested according to characteristic temperatures, such as the wax precipitation point and abnormal point. The critical transition temperature and the specific heat capacity of waxy crude oil are calculated, and an unavoidable destroyed exergy formula is derived. Then, taking the Daqing oil pipeline as an example, unavoidable destroyed exergy in various transportation intervals are calculated during the actual processes. Furthermore, the influential rules under various design and operation parameters are further analyzed. The maximum and minimum unavoidable destroyed exergy are 381.128 kJ/s and 30.259 kJ/s. When the design parameters are simulated, and the maximum unavoidable destroyed exergy is 625 kJ/s at the diameter about 250 mm. With the increase of insulation layer thickness, the unavoidable destroyed exergy decreases continuously, and the minimum unavoidable destroyed exergy is 22 kJ/s at 30 mm. And the burial depth has little effect on the unavoidable destroyed exergy. When the operation parameters are simulated, the destroyed exergy increases, but it is less affected by the outlet pressure. The increase amplitude of unavoidable destroyed exergy will not exceed 2% after the throughput rises to 80 m 3 /h. When the outlet temperature increases until 65 • C, the loss increase range will not exceed 4%. Thus, this study provides a theoretical basis for the safe and economical transportation of waxy crude oil. of insulation materials required for such pipelines, so as to achieve the smallest energy operation. Nguyen et al. [5] show that the oil platform is an energy-intensive system. Referring to the nature of oil, export specifications and oil field life, the energy used by each facility ranges from several megawatts to several hundred megawatts, and the overall system is energy-saving in terms from equipment size and process integration.In recent years, exergy has been regarded as an energy consumption evaluation index in thermodynamics. Exergy denotes that part of energy quantity that can be transformed into useful work to the utmost degree when substance or material flow changes reversibly from any state to a given environment equilibrium state. The concept exergy, which organically combines "quality" and "quantity" of energy and reflects the real value of energy, has made all kinds of energy comparable and solved the puzzling problem that none of the parameters can be singly used to assess the value of energy in thermodynamics and energy science. It also changed traditional ideas about energy character, energy loss and energy transformation efficiency, etc [6][7][8][9].The exergy analysis method addresses the deficiency of the first law of thermodynamics, whic...

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Section: Temperature Range Of Pipeline Transportationmentioning

confidence: 99%

“…Waxy crude insulation layer thickness is varied (20,30,40, 50 and 60 mm). Destroyed exergy during pipe transportation is calculated and destroyed exergy distribution curves are shown in Figure 6.…”

Section: Change With Insulation Layer Thicknessmentioning

confidence: 99%

Unavoidable Destroyed Exergy in Crude Oil Pipelines due to Wax Precipitation

Cheng

Yang

Zheng

et al. 2019

Entropy

Self Cite

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“…Increasing volumes of stowing operations determine the need to create and use new stowing mixtures that provide high physical and mechanical properties of the stowing mass with a minimum consumption of binder material (cement) [12][13][14]. With an increase in the fineness of the grinding of the solid phase due to the depletion of the ore, the yield of fine grades of fineness -the current enrichment tailings -increases significantly [15][16][17]. It is the current tailings that can be the main material for filling mixtures [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Substantiation and selection of the design parameters of the hydroficated equipment complex for obtaining backfill mixtures from current enrichment tailings

Alexandrov

Vatlina²,

Makharatkin

2023

PMI

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The issue of the influence of the concentration of the solid phase on the reduction of energy costs and specific energy consumption during pulp transportation is considered. The procedure for preparing slurry from the current enrichment tailings is shown. A scheme is given and the operation of a hydroficated unit for thickening and hydraulic transport of backfill mixtures is described. A diagram of the movement of solid particles in one of the units of the complex – a lamellar thickener is shown. The summary table shows the main design parameters and characteristics of the lamellar thickener. A general view of the laboratory setup used for experimental studies with slurry at various concentrations is given. An example of calculating productivity, density and specific load is presented. The dependence of the shear stress on the velocity gradient was determined for various pulp concentrations. Experimental studies of the process of thickening the production of slurry from the current enrichment tailings have been carried out. It was found that the geometric dimensions of the thickener depend on the concentration of the solid phase in the transported mixture. It is concluded that the flow rate of the slurry and the head loss are functions of the rheological characteristics of the viscoplastic slurry and can be calculated from the derived calculated dependencies.

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“…With the development of the process industry, pipeline transportation has been rapidly developed turned into an economically dangerous medium on a global scale [1] and [2]. Leakage accidents caused by self-defects [3], environmental factors [4] and human factors [5] have occurred, causing huge casualties, environmental pollution, and waste of resources.…”

Section: Introductionmentioning

confidence: 99%

Research on the Performance of a New External Occlusion Device for Pressure Vessel Leakage

Yan

Yang

Hou

et al. 2020

SV-JME

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Given the advantages and disadvantages of the existing plugging technology, a new type of external sealing device for pressure vessel leakage is proposed, which has the advantages of fast installation speed, small installation resistance, and stronger adaptability to the leakage surface. The connecting rod propulsion mechanism provides power, uses the fluidity of materials in the annular cavity to adapt to the complex curved surface, and carries out real-time monitoring and self-healing of the plugging process. Through the establishment of a finite element model of conventional top pressure plugging and the new type of external sac plugging method, simulation analysis of the leakage point and the pressure distribution around the crack leak has shown that: in the installation process of the new type of external liquid sac plugging device, a pressure-equalizing contact area and a sealing area are formed around the leakage point, and there is no obvious stress concentration phenomenon. When the thickness of the gasket is low, the deformation is uniform, which overcomes the problems of insufficient adaptability of the gasket in the conventional jacking method, and enhances the stability and reliability of emergency plugging.

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Studies on energy consumption of crude oil pipeline transportation process based on the unavoidable exergy loss rate

Cited by 13 publications

References 4 publications

Unavoidable Destroyed Exergy in Crude Oil Pipelines due to Wax Precipitation

Unavoidable Destroyed Exergy in Crude Oil Pipelines due to Wax Precipitation

Substantiation and selection of the design parameters of the hydroficated equipment complex for obtaining backfill mixtures from current enrichment tailings

Research on the Performance of a New External Occlusion Device for Pressure Vessel Leakage

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