Stand for studying the dynamics of gas and two-phase gas-liquid flows in the relief piping

 

(57) Abstract:

The inventive modeling section of pipe of three parallel tubes of different diameter provided with a swinging side member articulated node and a tripod, in which it is installed to rotate in a vertical plane in the range of 0 - 20. Glass pipe facing and downstream sections are connected by an angle of 120 one with respect to another steel curved inserts with welded fittings. Fitting have a three-way valves to enter into the cavity of the gas pipes and connect the reference gauge. In the ascending pipe installed cassette dedicated flow straightener made in the form of packages of thin-walled tubes of smaller diameter. The pump station has three pumps connected in parallel. On the suction line station includes a saturator and a gas cylinder for cooking gas-saturated model of fluid and connected to a pump with capacity for the analyzed fluid. 3 C.p. f-crystals, 3 ill.

The invention relates to the dynamics of gas and two-phase gas-liquid flows in the relief pipes, such as gas oil and oil products in terms of phase transitions in mA the range of measurements, the decline in the relative size of the model area relief pipeline and providing the possibility of modeling the growth dynamics of the gas accumulations in phase transitions and their subsequent erosion (dissolution) in conditions as close as possible to the real characteristic of trunk pipelines.

This objective is achieved in that the stand for the study of hydrodynamic processes of two-phase flows in the relief piping is a model measuring range is made from three parallel arranged for swinging spar glass tubes of different diameter, which is mounted through a hinge in the tripod can be rotated in a vertical plane in the range of 0-20aboutglass tubes having upstream and downstream sections, connected at an angle 120aboutrelative to each other through a bent steel inserts with welded fittings with a three-way valves to enter into the cavity gas pipes simulating gas accumulations, and connect the reference gauge to determine the pressure in the gas accumulation.

In addition, in ascending sections provided cassette dedicated flow straightener, the situation of the indices of flow of the pumped model fluid.

On the suction line of the pump station stand includes a saturator for the preparation of gas-saturated model of fluid connected with a pump with capacity for liquid and gas bottle.

In Fig.1 shows a diagram of the stand; Fig.2 - scheme of the test section of the stand is installed in the holder; Fig. 3 - section a-a in Fig.2 (cross-section of the pipe at the place of installation of the cassette dedicated flow straightener).

The stand consists of a receiving and storage tanks for model liquid E1 displacement of 1.2 m3, pumping station (NS), consisting of three parallel-connected centrifugal pumps N1, N2 and N3, the metering unit (CU), equipped with two parallel mounted flowmeters P1 and P2 type TURBOQUANT, measuring sector (PS), made of three parallel arranged for swinging spar glass pipe diameter 0,056, 0,079 and 0,105 m respectively, which is mounted through a hinge in the stand and site preparation of gas-saturated liquid (URGE), including the saturator (S) with a drive for saturator (PS), a gas cylinder (GB) with pressure regulator (RD). All main components of the stand are connected by galvanized steel pipes with a diameter of Dy= 50 mm

The pumps at the pumping mill is Tr (f), a control manometer M2 and the drain pipe with a valve 7 for draining the model fluid from the system process piping NS.

The metering unit has two parallel measuring lines with flow meters P1 and P2 connected by means of the valves 8 to 11 in the bypass line with valve 12.

SU through a control valve 13 is connected with the measuring section (PS) by means of a flexible rubber sleeve 14 (Dy= 50 mm), providing the ability to move Yiwu in the vertical plane.

Measuring range (see Fig.2) simulating the profile element pipe, consists of three parallel arranged on the swinging side member 15 of the glass pipe diameter 0,056, 0,079, 0,105 m respectively, which is mounted through hinge 16 in the stand 17. Pipe Yiwu consist of ascending and descending sections, having a length L1= 1.1 and L2= 5.1 m, respectively, are interconnected at an angle of 120aboutrelative to each other through a bent steel inserts 18, with welded fittings with a three-way valves 19 and 21 to enter into the cavity of the pipe gas from the gas container through the pressure regulator and the valves 22 and 23, modeling gas accumulations and connect the reference gauge M1 for esmerine chasers cranes 24 - 29. Using the rolling bearing 30, the downstream section of the glass tube has the ability to change the tilt angle in the vertical plane in the range of 0 - 20abouton the horizontal axis. In addition, ascending the plots have a cassette dedicated flow straightener 31, consisting of a package of thin-walled tubes of smaller diameter (see Fig.3) to provide stabilization of hydrodynamic characteristics of the flow of the pumped model fluid.

Distributor of the descending part Yiwu with cranes 27 - 29 through a flexible hose 33 is connected to a return line 34 which is connected by means of the valves 35 and 37 with receiving a consumable capacity of E1 and saturator With, and with the valve 32 is connected with the calibrated capacity of E2 under control measurements of flow rate model fluid volume method in the region of small values of the cost. To model fluid pumping from a calibrated tank E2 in receiving the supply tank E1 includes a pump H4 and piping with valves 38 and 39.

Site preparation of gas-saturated liquid through the valve 40 is connected to the suction line of the pump station and includes a saturator having a drive substation and connected to a gas cylinder through Reguera M3 and M4. Receiving the supply tank E1 is connected to the intake manifold at the pump station crane 42.

Preparation stand to work is as follows.

Include one of the pumps, such as H3, pumping stations and open valves 42, 5, 6, 26, 29, 35 and 36 and control valve 13 produce filling one of the pipes of the investigated area model fluid from the output-supply tank E1. The three-way valve 21 is open and connects the cavity of the investigated area with the atmosphere. After filling the system model fluid pump includes using movable support 30, the downstream section of the glass tube is set up and fixed at a certain angle to the horizon in accordance with the plan of the experiment. Then by means of the valves 22 and 23 from the gas tank through the pressure regulator serves gas, forming gas concentration required for the experiment, while the part of the model fluid is displaced in a calibrated tank E2. The valve 12 to the bypass line metering close and open the valves 8 and 10, connecting one of the flowmeters, for example P1, allowing to define as a volumetric quantity of fluid and instantaneous current flow value.

providing desired flow model fluid, and simultaneously open the valve 29 on the descending section of the measuring site. With the regulating valve 13 establish a more accurate model fluid flow in the system, which is controlled by the flow meter P1. Simultaneously with the start of the pumping station in the operating mode include a stopwatch, which record the time of the erosion or removal of gas accumulations, and with the help of the reference manometer M1 measure the pressure change in the gas concentration during the experiment. At the end of the experiment model the liquid from the measuring unit with a pump H4 merge in receiving the supply tank E1.

In the study of hydrodynamic processes in gas-saturated model fluid work on the stand is as follows.

Opening the valve 37 on the back of the line model fluid fed into the saturator. After filling the saturator liquid from a gas cylinder through a pressure regulator at an open gate valve 41 in the saturator, serves a Mixture of gas with liquid in the saturator are subjected to a thorough mixing with a drive of the saturator. When the gas is dissolved, i.e., saturates model fluid. After preparation of gas-saturated liquid, the valve 37 and the valve 41 zakrya the carbonated liquid, differ only by the fact that the regulating valve 13 create a pumping modes, simulating how the growth in gas accumulations in terms of phase transitions or the degassing of gas-saturated liquid, and removing the gas accumulations or dissolution fluid flow by increasing its consumption.

Study of the process of removal and washing of the gas accumulations and their growth in terms of phase transitions at pumping as degassed and gas-saturated liquids allows us to predict similar processes on a real pipeline, which may negatively impact their performance, equipment reliability, reliability of accounting pumping volumes of oil and oil products, as well as to choose the most efficient modes of pumping fluid to avoid these complications.

1. STAND FOR studying the DYNAMICS of GAS AND two-phase gas-LIQUID FLOWS IN the RELIEF PIPING, consisting of Primorskugol capacity for the analyzed fluid, pump stations, filter, metering, glass pipes, simulating the relief section of the pipeline, pipelines, process piping, wherein simulating the Uch is Mirny node and tripod in which it is installed to rotate in a vertical plane in the range of 0 - 20oand a glass pipe with ascending and descending sections are connected by an angle of 120oby bent steel inserts with welded fittings, the latter are three-way valves to enter into the cavity of the gas pipes and connect the reference gauge.

2. Stand under item 1, characterized in that the ascending pipe installed cassette dedicated flow straightener made in the form of packages of thin-walled tubes of smaller diameter.

3. Stand on PP. 1 and 2, characterized in that the pump station has three pumps connected in parallel.

4. Stand on PP. 1 to 3, characterized in that the suction pump station installed saturator and gas cylinder for cooking gas-saturated model of fluid and connected to a pump with capacity for liquids.

 

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