Supersonic tube for preparing gas transporting

FIELD: oil industry.

SUBSTANCE: supersonic tube comprises Laval nozzle, cyclonic separator with the blade, diffuser for discharging dried gas, and diffuser for discharging condensed liquid. The blade is made of deformed plate set in the screw groove made in the inner side of the cyclonic separator. The length of the plate is at least ½ of the pitch of the screw groove. The housing of the tube of the cyclonic separator receives locking members whose faces enters the screw groove. The distance between the adjacent locking members mounted in the screw groove is equal to the length of the plate.

EFFECT: enhanced efficiency.

4 dwg

 

The invention relates to devices used in the oil and gas industry, and can be used for the preparation of associated petroleum gas to distant transport due to dehydration and low temperature separation of heavy hydrocarbons.

Known devices for low-temperature condensation, in which the raw gas compression, cooling, separation of the gas phase and condensation in heat exchangers and condensers by separation using an external refrigeration cycle with subsequent detenizatsiii in a distillation column, for example installation in A.S. No. 732637, USSR, F25J 3/06, application No. 4607307/23-26 from 29.11.88, F25J 3/00, which differ in the necessity of using a large range of equipment, including compressor, large capital and energy costs.

There are devices that use machineless ways of getting cold: device with water pipes, for example, in A.S. No. 1726927, F25 9/02, A.S. 1732752, F25 9/02, as well as devices with supersonic tubes, for example, by A.S. 2106581, F25 9/02.

A known design of the device for separation of gas, water and heavy hydrocarbons using supersonic tubes, consisting of an extender with a Laval nozzle, cyclone separator supersonic blade diffuser to dry gas outlet and diffuser for exhaust RMSE is desireables liquid - (Fatimata, Dambrova // "Oil and gas technologies" №6, p.41) prototype.

In the famous supersonic tube compressed gas in the critical cross-section of the Laval nozzle acquires a velocity corresponding to a Mach number equal to 1, then the gas is expanded to M=1,3...1,5, gas pressure is reduced to ˜0.3 of the original value, and the temperature is reduced to ˜60°from the original values, while water and heavy hydrocarbons (C5and above) are condensed.

The blade is placed in a supersonic stream, discards from the flow axis formed drip the liquid on the tube wall, and then separated flows down each diffuser, while the dried gas through the Central cone is diverted into a pipeline with a pressure of up to 0.8 times the initial value, and the liquid stream with the partially entrained by the gas along the circular cone is diverted into the tank for condensate collection.

Known supersonic tube is a device with a fixed gas flow, which creates a pressure drop. The efficiency of the device (the degree of condensation and separation of moisture and heavy hydrocarbons from the gas) depends on the parameters of the expanded gas (pressure and temperature), and the location and shape of the blade, knocking the condensed liquid on the inner surface of the pipe.

The disadvantages of the local design supersonic tubes are fixed (hard) the position of the blade in the pipe, as well as the performance of the blade in the form of a flat plate, the front edge which generates a shock wave that provides centrifugation drip liquid to the pipe wall.

But for each gas composition and parameters there exists an optimal arrangement of the blade relative to the nozzle, that is, the blade must be able to move and be installed in cross-section, where the maximum is condensed fluid: after passing the nozzle in the gas flow amount of the condensed liquid increases and reaches the maximum value at a certain distance from the nozzle.

In addition, the shape of the blades must contribute to the garbage drip liquid on the inner surface of the pipe.

The technical task of the present invention is to increase the efficiency of the supersonic tube by increasing the volume of discharge in the pipe and the condensed moisture and heavy hydrocarbons from the gas supplied into the tube.

The technical result is achieved by the fact that in the supersonic tube containing the Laval nozzle, cyclone separator with vane diffuser for dry gas outlet and diffuser for removal of the condensed liquid, the blade is made in the form of a deformable plate, inserted into the screw groove made in the inner surface of the cyclone separator, while latina has length L PLnot less than1/2step screw groove S, and in the case of pipe cyclone separator installed clamps, the ends of which are screw groove, the distance between adjacent retainers mounted in the helical groove is equal to the length of the plate.

1 shows a General view of the supersonic tube, figure 2 - shape of the deformed plate after installing it in the helical groove, figure 3 - inputs to the diffusers, figure 4 - cross section of the pipe.

Supersonic tube consists of a Laval nozzle 1, the cyclone separator 2, plate 3, dry gas diffuser 4, the diffuser fluid 5, retainers 6.

Plate 3 is inserted into the screw groove δ cyclone separator 2, while it is deformed along a helical surface (see figure 2), fixed plate in the axial direction with the help of clamps 6 in several positions along the pipe axis with a step equal to the length of the plates.

Supersonic pipe works as follows.

Crude oil associated gas under pressure inlet PIand with the temperature TIserved in the nozzle 1, in a critical section which gas has a velocity corresponding to a Mach number equal to 1, then the gas is expanded to M=1,3...1.5 and enters the pipe cyclone separator 2, in which the gas pressure is reduced to ˜0,3PIand the temperature is reduced to ˜60°and from the initial values. When data parameters gas water present in the gas, as well as heavy hydrocarbons (C5+ higher) are condensed, and the degree of condensation increases as the distance of the stream from the nozzle and in a cross-section reaches the maximum value.

Formed drip the liquid descending on the screw surface of the blade 3, which generates a vortex of high tension, the gas flow is twisted and drip the liquid is discarded from the axis of the flow on the pipe wall.

The residence time of the gas inside the cold supersonic separator is only a few milliseconds, which prevents hydrate formation.

Further condensation on the pipe wall in the form of a thin liquid film flows into the diffuser 5, in which the speed of the liquid (and partially entrained with the liquid gas) is reduced, the pressure liquid-gas mixture increases up to 0,7...0,8 PI, after which the mixture is discharged in the tank for condensate collection.

The gas, which after passing the blade 3 is separated condensate enters the diffuser 4, in which the velocity of the gas flow is reduced and the pressure increased to 0,7...0,8 PI. Next, the dried gas is directed into the transport pipeline.

When working supersonic tube after a certain time to produce the changeover - slip plate 3 OS along the pipe and determine the data for specific parameters and gas composition, the optimum position of the plate, in which of pipe separates the greatest amount of condensation. Helical surface groove allows to displace the plate along the pipe without changing its shape.

Thus, the proposed solution improves the efficiency of the supersonic tube due to the helical surface of the blade, ensuring the generation of a vortex higher tension, but also due to the possibility of displacement of the blade without changing its shape along the pipe axis, which allows for the installation of the blade in the position corresponding to the maximum separation of moisture and condensate from the treated gas.

Supersonic pipe for gas transport to distant containing the Laval nozzle, cyclone separator with vane diffuser for dry gas outlet and diffuser for removal of the condensed liquid, characterized in that the blade is made in the form of a deformable plate, inserted into the screw groove made in the inner surface of the cyclone separator, and the plate has a length not less than1/2step screw groove and the casing pipe cyclone separator installed clamps, the ends of which are screw groove, the distance between adjacent retainers mounted in the screw groove is equal to the length of the plate.



 

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