SU1634946A1 - Method of transfering gas or liquid by pipeline - Google Patents

Description

The invention relates to pipeline transportation and can be used for the transport of natural gases, oil, water and energy carriers.

Methods are known for reducing the resistance to movement of a gas (liquid) by blowing gases (liquids) through a streamlined surface.

However, these methods are not acceptable for trunk pipelines due to the complexity of the injection system, the high metal consumption and the complexity of operating such systems.

The closest to the proposed method is the transport of gases and liquids through pipelines under the effect of pressure drop generated at the ends of the pipeline. For a given pipeline geometry, the resistance to the movement of gas (liquid) and the value of the required pressure drops increase with productivity. To reduce the flow resistance and increase the productivity of pipelines, various methods are used to reduce the viscosity of the transported gases (liquids) by introducing various additives.

However, such a method for trunk pipelines is unacceptable due to the large number of additives introduced and the instability of the properties of the transported stream.

The aim of the invention is to reduce the energy consumption for gas flow.

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fluid through the pipeline and improved performance.

The goal is achieved by the fact that according to the pumping method, which involves creating pressure differences, low-speed zones sequentially arranged along the length of the pipeline are created at its ends near the surface of the pipeline, the pressure level in which in each cross section of the pipeline is higher than the pressure in the main flow in the center of the pipeline, under the action of the created pressure drop, the near-wall low-speed flow is directed towards the main flow, high-speed gas is pushed aside a (liquid) from the surface of the pipeline ,,

The drawing shows a schematic diagram of the flow of gas (liquid) through a pipeline according to the proposed method.

As can be seen from the drawing, low-speed near-wall zones are located sequentially along the entire length of the pipeline. But the pipeline lengths are separated by impermeable surfaces 10. In each zone, the total flow of gas (liquid) with the help of perforated (pierced) surface 2 is divided into a main flow moving in the center of the pipeline and an auxiliary flow moving near the inner surface. pipeline0 The main task of transporting gas (liquid) through a pipeline is the main stream; the auxiliary flow helps the main flow to move at a high speed, reducing the surface resistance of the main flow to the pipeline surface. The auxiliary flow is organized near the surface so that its speed (Ub) is significantly lower than the speed of the main flow (U0) 0 In this case, the pressure in the auxiliary flow (P) there will be higher pressure in the main flow (P ") in each section of the pipeline. Under the action of the resulting pressure difference (PR PR - P0), they change the direction of movement of the auxiliary flow and direct it towards the main through the perforated interface 2.

A device for implementing the method contains a pipeline used previously for transporting gas (liquids). In the pipeline along its entire length, inserts are concentrically mounted. Each insert is a section of a cylindrical pipe, the surface of which is perforated.

The size of the gap (Ј) between the surface of the pipeline and the cylindrical surface of the insert is determined from the condition of the maximum performance of the pipeline. It is advisable that the diameter of these inserts is 0.7-0.98 of the pipe diameter. The length L of the inserts is 3-25 gaps between the insert and the pipeline, the cylindrical surface of the insert is perforated, the degree of perforation is 5-20%, and the sizes of the perforations are 0.01-0,0001 pipe diameter is used, centering elements are installed at the beginning of the insert, the same elements determine the distance between the inserts (equal to I - 2 gaps between the insert and the pipeline, a cylindrical collar is installed at the end of the insert, the outer diameter of which is It coincides with the diameter of the pipeline.

It is possible that the interface 2 is tapering downstream. An example of such a surface is the surface of a truncated cone. In this case, in each zone, the velocity of the main stream increases downstream, and the speed of the auxiliary stream decreases accordingly. This behavior of the velocities of the main and auxiliary flows makes it possible to obtain the necessary pressure gradient (DF) to ensure a sufficient injection rate (VB) even in the absence of resistance of the main flow. Moreover, the restriction is chosen so that the diameter of the perforated surface at the end of the insert is less than the diameter of the perforated surface at the beginning of the insert by no more than 2%. The distance between adjacent inserts is advisable to be taken equal to 0.01-0.15 diameters of the pipeline.

Thus, the narrowing perforated section 2 surfaces allow more severe reduction of the resistance to movement, improve the performance of pipelines and reduce energy costs.

Claims (1)

METHOD OF GAS OR LIQUID PUMPING BY PIPELINE, including the creation of a pressure difference at its ends, characterized in that, in order to increase the pumping capacity and reduce energy consumption, low-speed zones are sequentially located along the pipeline surface, the pressure level of which in each transverse the cross-section of the pipeline is higher than the pressure level in the main stream in the center of the pipeline, under the action of the created pressure drop, a wall low-speed is directed stnoy flow in the main flow direction, pushing the high-speed gas layers (liquid) from the surface of the pipeline.