Наукові вісті Далівського університету № 21
Permanent URI for this collection
Browse
Browsing Наукові вісті Далівського університету № 21 by Author "Smalii, V."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Model of Solid Particle Deposition from the Turbulent Gas FLow.(СНУ ім. В. Даля, 2021) Granovskiy, E.; Smalii, V.; Грановський, Е. О.; Смалій, В. В.The deposits of solid particles on the walls of pipeline are the cause of pipeline choking and even rupture accidents in industry each year causing misleading the process intent, destructions, human casualties as well as environmental pollutions. To measure and to manage the risks caused by particles deposition are one of the objectives of modern process safety. The measure of risk means to find a probability of event occurring during some specific duration of time (most often 1 year) and to know the consequences of the event. To be able to find the probability of pipeline choking the dynamic model of particle deposition need to be developed. There are numerous studies of solid particle deposition on the walls of pipeline with turbulent or laminar flows of compressible or incompressible liquids. The model of solid particle deposition from the turbulent gas flow has been proposed and qualitatively verified under this study. The solution of governing equations with applying of finite elements method and numerical analysis has been found. In the basics of the current study the model of particle deposition intensity from the turbulent flow developed by S. K. Beal (1970) has been applied. The model accounts both eddy and Brownian diffusivity factors which are competing with each other depending on particle’s size scale and flow properties. A comparison of the model’s behaviour with the other particle deposition model has been provided and showed a good qualitative agreement with other studies. The model can be applied in numerical risks analysis (with caution) in the part of time duration calculation which causes the critical increasing of pipeline’s resistance. Also finite element method gives the profile of deposits (deposition thickness distribution along the pipe) which can be useful to predict the possible coordinates of the maximum deposition thickness as well as to study the influence of different initial conditions such as particle and fluid properties on the deposition rate and distribution as well as to observe a hydraulic regime in the pipeline.Item Safety of Emergency Releases Containing Solid Phase.(СНУ ім. В. Даля, 2021) Granovskiy, E.; Smalii, V.; Korol, D.; Грановський, Е. О.; Смалій, В. В.; Король, Д. Р.The quantitative risk assessment is the most accurate way of risk determination and the basic approach of obtaining valuable information for further risk management. The risk can be determined as a probability of some event with hazardous consequences occurring during time diapason such as one year. There are variable applications of risk assessment in industry and the technology of risk assessment constantly improves because of widely spread using of risk-oriented approach. Regulations in all countries create specific influence for engineering methods integrating safety in the technology systems. However there are various scientific problems in quantitative risk assessment in specific situations during risk studies. Such situation has occurred in flare pipeline system of combined polymer and refining enterprise. Solid particles of polymers as products of polymer synthesis can be contained in emergency releases and can create deposits along the pipeline of flare system which can be the cause of significant declination from design intent and lead to decreasing or even stopping of the flow rate. The blockage of pipeline can lead to depressurization and rupture of apparatuses with dangerous chemicals inside and consequences can vary from economic losses to ecological damage or even people death. In the current study quantitative method of risk assessment of the flare system has been developed, applied and studied. Main focus was on hazards due the deposition of solid polymer particles along the pipeline and following pipeline blockage. The deposition of solid polymer particles has been simulated, design intent declination criteria have been chosen. The probability of design intent declination has been defined using methods of mathematical statistics and probability theory. Advantages, disadvantages and limits of developed quantitative method of risk assessment have been discussed in the study. The results of study showed that the new approach of quantitative risk assessment of pipe transport systems where deposits occurs can be implemented in a fast way and has easy-to-understand algorithm. The output data showed that the expected frequency of emergency releases, concentration and size of solid particles, flow parameters and the time needed to reach the design intent declination during continuous emergency release have great influence on the risk value of design intent declination.