Abstract
The need to design a model of a throttling device, which is used in the process of low temperature separation (LTS) of moisture from the gas flow, is predetermined by the necessity to coordinate the modes of functioning of the throttle with the modes of the heat exchanger and the separator that are included in the installation of separation. Proceeding from the task of efficient management of the process of the LTS of moisture from the gas flow, we analyzed a channel of control of the flow of gas under throttling. The peculiarity of managing the process of separation of moisture is in the contradiction between the productivity of the gas flow and the conditions of moisture removal. In order to study the influence of parameters of a throttle on the formation of the modes of passing flow, a distribution of the field of the flow velocities is obtained in the software environment of ANSYS Workbench. Visualization of the flow stream allows analyzing the level of turbulence of the flow under throttling and forecasting the trajectory of moisture droplets formed at throttling. By comparing the data obtained from the experimental installation with the data of numerical calculations, carried out in accordance with wellknown mathematical models of the flow under throttling, we conducted the assessment of the adequacy of the description of the object of control. It is shown that the assumption of incompressibility of natural gas when evaluating the rate leads to significant errors. As a result of the identification of the parameters of a throttling device, its simulation was implemented in the environment of MatLab Simulink. Block construction of the model allows performing simulation under conditions of arbitrary nature of the change in the parameters of the process over time. The assessment of the adequacy of simulating a throttle device allows using the studied model for constructing a model of an installation of moisture separation from gas flow.
Highlights
The main task of the preparation of natural gas for transportation is the separation of moisture and various additives that it contains
In the units of complex processing of gas (UCPG), the process of low temperature separation (LTS) is used, which occurs as a result of throttling of the flow of natural gas
It should be noted that the dew point (DP) for water is different from that for hydrocarbons contained in natural gas
Summary
The main task of the preparation of natural gas for transportation is the separation of moisture and various additives that it contains. Additional difficulties during moisture separation during the LTS are the influence of the flow rate of gas on the process of separation because, under certain values of the flow velocity, an unwanted removal of condensed droplets from the separator occurs [1]. These difficulties are caused by joint influence of a cross-sectional value of a throttle valve on the gas rate (flow velocity) and the pressure drop in the throttle. The relevance of the work is determined by the objective to obtain an adequate definition of the parameters of a throttling process, since an adequate model allows developing the criterion of efficient control over the process and creating a control system based on it
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