The method of transportation of cryogenic liquids and the pipeline for its implementation

 

(57) Abstract:

The invention relates to pipeline transport, in particular to pipelines for transportation of cryogenic environments. The method of transportation of cryogenic liquids in two-pipe pipeline involves creating a reserve length of piping, cooling down the inner pipe of the pipeline to the temperature of the pumping of the product, the injection of a transportable product and controlled temperature regimes and pressure of the pipeline. And after ensuring operation mode of the inner pipe of the pipe to create a vacuum in the annular space. A pipeline for the transportation of cryogenic liquids consists of two concentric installed pipe fixed support and technical means for regulating the temperature and pressure. Outer and inner pipes of the pipeline mounted for movement relative to each other, the outer pipe is provided with two nozzles, and at least two supports each linear section of the pipeline is placed a sealed chamber of a length equal to the longitudinal displacement of this section at the temperature of operation while the camera is connected with the outer pipe TRU the rotation of the heat transfer from the interior of the pipeline and increasing the reliability of operation of the pipeline. 2 S. p. f-crystals, 1 Il.

The invention relates to pipeline transport, in particular to pipelines for transportation of cryogenic environments.

There is a method of transportation of liquefied natural gas in a mixture with hydrocarbons by pipeline. C. the USSR N 462049, F 17 D 1/02, 1975, BI N 6), including the cooling and liquefaction of the gas in the place of extraction, transport it by pipeline and evaporation device in place of gas consumption, which serves the flow of refrigerant.

The disadvantage of this method is the need for cooling of the refrigerant at the consumer due to the evaporation of the liquefied gas and the subsequent transportation of refrigerant to the place of liquefaction of the gas. The refrigerant can reduce losses in the liquefaction of natural gas in the area of production, but the cost of shipping it significantly complicate the design of the pipeline, reduce the reliability of the pipeline process increases the cost of transportation of liquefied gas.

You know the transportation by pipeline of liquefied natural gas (Christmas B. B., P. Soloviev S. Peculiarities of calculation and design of pipelines for liquefied natural gas. The construction of pipelines, 1971, No. 6, S. 6-9), as adopted for the prototype, which provide colagenase pipeline condition creates a "stock" length, which is then spent on the floor "shortening" of the pipeline when cooled transported liquefied gas. To create a "stock" lengths of each section of piping between anchors strongly cooled during installation and refrigerated fix. This pipe is made of a multilayer.

However, the implementation of operations tahaliyani pipeline and secure fulfillment of the conditions of the temperature management of the pipeline during operation, the placement of various types of insulation significantly complicate the design of the pipeline, reduce the reliability and increase the cost.

Known pipeline, consisting of two concentric set of tubes, means for maintaining the pressure in the annular space in the form of a tube with a membrane, indicating the internal cavity of the pipe with the annular space (and. C. the USSR N 956906, F 17 D 5/02, 1982, BI N 33).

The disadvantage of the design is the inability to control temperature conditions of the pipeline.

Known pipeline for the transportation of cryogenic liquids, consisting of a heat-conducting casing, the inner pipe with holes set in collectors kalawy the th expansion of the material of the pipeline. C. the USSR N 752116, F 17 D 1/04, 1960, BI N 28) adopted for the prototype.

A disadvantage of the known device is that when cooling down the inner wall of the pipe to a temperature close to the temperature of the transported medium, is the release of cryogenic fluid in the annulus. During transportation of the liquid will be the heat transfer between the inner pipe and the casing. In addition, the presence of holes in the inner pipe causes stress concentration, lowers the strength of the inner pipe, complicates constructive design.

The technical problem solved by the invention, is to prevent heat transfer from the interior of the pipeline through the annulus and improving the reliability of operation of the pipeline.

The problem is solved due to the fact that the method of transportation of cryogenic liquids in two-pipe pipeline, including creation of a reserve length of the pipeline, pumping transportable product and controlled temperature regimes and pressure of the pipeline, according to the invention before filing the transported product zakolerovat inner pipe of the pipeline to tempera space.

In addition, the problem is solved also due to the fact that in the pipeline for the transportation of cryogenic liquids, consisting of two concentric installed pipe fixed support and technical means for regulating the temperature and pressure, according to the invention, the outer and inner tube mounted for movement relative to each other, the outer pipe is provided with two nozzles, and at least two supports each linear section of the pipeline is placed a sealed chamber of a length equal to the longitudinal displacement of this section at the temperature of operation while the camera is connected with the outer pipe of the pipeline by means of telescopic joints.

The invention is illustrated in the drawing, which schematically shows the pipeline.

A pipeline for the transportation of cryogenic liquids consists of two concentric set of tubes: an outer tube 1 with the insulating layer and the inner pipe 2. Outer tube 1 is equipped with outlet 3 and the inlet 4 nozzles. The inner tube 2 rests on the supporting device 5. Fixed support 6 of the pipeline is equipped with a stationary sealed chamber 7. Compensators 8 connection the provision of the inner pipe 2 pipe annulus metered (portions) served cooler (transported product) through the inlet pipe 4, and the heated mass is removed through the discharge pipe 3. Metered flow of liquefied gas avoids the sharp increase in pressure in the annular space. Additionally, the pressure in the annular space can be adjusted through a discharge pipe provided with a means of pumping the medium from the annulus (not shown). Annulus allows the internal cooling down of the pipeline, i.e., to provide "stock" length by shortening the pipeline. Telescopic joints provide the necessary "stock" length for external piping.

When cooling down, the outer pipe 1 pipe moves relative to the inner tube 2 by the control device 5, and acquires a negative temperature equal to the temperature of the transported product (liquefied natural gas). And moves relative to the sealed chamber 7, which is fixed on the fixed bearing 6 of the pipeline and connected to the outer end of the pipe 1 by means of telescopic joints 8. This allows cooling down the inner pipe of the pipe without giving inside liquefied natural gas. After reaching the inner pipe temperature switch shall lailanie internal pipeline avoids dynamic processes and growth pressures from the temperature difference of the inner surface of the inner pipe of the pipe and the pumped liquid product.

Once the annulus is pumped out of the environment and create a vacuum, which is a thermal insulation for the inner pipe.

Upon cooling the inner pipe outer pipe is shortened. Compensating for external piping using longitudinal telescopic joints, which connect the outer pipe sealed with a fixed camera, so, telescopic expansion joint seal annulus and the shortening of the outer pipe.

The sealed chamber is placed on at least two fixed support each linear section of the pipeline. Cameras provide "stock" length by shortening the inner pipe (line pipe), i.e. the linear portion of the pipe must have at least two sealed chambers, mounted on fixed supports. Fixed support without cameras on a linear plot may not be altogether if the plot of a short length (10 - 30 m), or several dozen, if the length of the plot more than 20,000 feet, for Example, if the pipe length of 100 km is shortened by 10 m, the length of the chamber should be at least 10 m Above constructive OS is and internal pipelines relative to each other.

For testing and implementation of the proposed method was constructed a prototype device. In a sealed chamber 1000 and 300 x 20 mm through holes in the side walls placed the pipe from steel Article.3 size 73 x 4 mm and a length of 1200 mm, Then after removing the cap from the pipe flooded the chamber with liquid nitrogen. As the evaporation of the nitrogen was cooled pipe to a temperature of T = -120oC. the temperature in the sealed cavity of the pipe was measured with a thermometer. The shortening of the pipe was measured by metric grids deposited on the outer surface of the pipe. Cooling down pipe was carried out for 4 hours and 25 minutes

When the temperature in the cavity of the pipe T = - 123oWith its shortening at a pressure of 764 mm RT. senior amounted to 1.6 mm In the subsequent temperature in the system was maintained at the expense of the steady-state conditions.

The proposed method for the transportation of cryogenic liquids in two-pipe pipeline allows pumping five times more natural gas in a liquefied state as compared with the traditional trunk pipeline with the same diameter pipe.

In addition, the design twin-tube pipeline allows CPA is effective to solve the problem by "shortening" or "lengthening" of the external and especially internal piping.

1. The method of transportation of cryogenic liquids in two-pipe pipeline, including creation of a reserve length of the pipeline, pumping transportable product and controlled temperature regimes and pressure of the pipeline, characterized in that before applying the transported product zakolerovat internal plumbing pipe to a temperature pumping of the product, and after ensuring operation mode of the internal pipe to create a vacuum in the annular space.

2. A pipeline for the transportation of cryogenic liquids, consisting of two concentric installed pipe fixed support and technical means for regulating the temperature and pressure, characterized in that the outer and inner tube mounted for movement relative to each other, the outer pipe is provided with two nozzles, and at least two supports each linear section of the pipeline is placed a sealed chamber of a length equal to the longitudinal displacement of this section at the temperature of operation while the camera is connected with the outer pipe of the pipeline by means of telescopic joints.

 

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