REGULARITIES OF CHANGES IN PARAMETERS OF MULTICOMPONENT HYDROCARBON MEDIA TRANSFER IN SEPARATION CONDITIONS

• Main Authors: Eugeniy V. Nikolaev, Sergey N. Kharlamov
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2019-10-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: transport coefficients; multicomponent system; hydrocarbons; separation; modeling
• Online Access: http://izvestiya.tpu.ru/archive/article/view/2311/2084

In solving applied tasks of determining the characteristics of parameters changes in gaseous continuous media during convective heat and mass transfer, friction resistance in devices and equipment ensuring the operation of technological processes in the oil and gas industry, the understanding of mechanisms and intensity of heat, mass and momentum transfer processes is valuable. Such tasks are nontrivial because of the pronounced nonlinearity of effects, instability and diversity of the composition of mixtures, as the working medium of the apparatus, and require large a priori information in modeling, the obtaining of which is limited by specifics of the processes and their experimental analysis. The studies aimed at clarifying and predicting the patterns of changes in the local and integral properties of homogeneous and heterogeneous hydrocarbon systems in the apparatuses of fuel and energy complex are relevant and valuable for practice. The main aim of the study is to identify features and establish patterns of local parameters evolution of convective heat and mass transfer in oil and gas devices (such as the coefficients of dynamic and kinematic viscosity, heat and thermal diffusivity, diffusion, and their dimensionless analogs – Prandtl, Schmidt and Lewis numbers), focused on the use as working fluid of multicomponent hydrocarbon gas media in the range of temperature and pressure conditions typical for operation of oil preparation equipment at separation – T ≅ 0–70 °C and P ≅ 0,1–3,5 MPa. The methods: thermodynamic model in HYSYS software – Peng-–Robinson equation of state, statistical mechanics, the principle of corresponding states, the Chapman–-Enskog, Golubev methods, similarity theory and dimension analysis. Results. Within the framework of equilibrium thermodynamics the authors have carried out the detailed study of the evolution of local and integral parameters of momentum, heat and mass transfer in hydrocarbon gas mixtures under separation conditions at given temperatures and pressures in the working media. The limits of applicability of the practical use of the similarity method in quantitative estimates and qualitative predictions of the mechanisms and configurations of convective heat and mass transfer in oil preparation devices are established. The results of using the method of analogies in modeling separation in general issues of the momentum, heat and mass transfer in the problems of the oil and gas industry are discussed. The authors recommend in practice of designing equipment the conclusions on the peculiarities of properties changes in mixtures that are complex in structure and intensity of heat and mass transfer mechanisms during separation, violating the triple analogy in non-isothermal homogeneous and heterogeneous media.