RU2406916C1 - Device for field pipelines flameless heating - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device for field pipeline flameless heating consists of cylinder case by means of branches connected to at least two collectors and arranged concentrically on pipeline forming circular space between case and pipeline. Heat carrier circulates in this space. Also the collectors have an inlet branch with an installed there burner and a fan. The case can axially travel relative to the pipeline.

EFFECT: inexpensive device for pipeline heating, raised process indices of device, intensification of heat exchange, reduced wear of pipeline and reduced expenditures for repair and check of condition; raised fire safety; simple fabrication without special equipment.

2 cl, 3 dwg

Description

The invention relates to the oil and petrochemical industry and can be used as pipe heaters for the transportation of highly viscous products, in particular for the transportation of oil and oil products.

The prior art devices for heating pipelines for transporting oil.

So, from the USSR patent No. 343483 (IPC Н05В 3/10, published 06/22/1972) there is known a device designed for heating pipelines for transporting oil and oil products, which contains a heating element made in the form of a pipe made of ferromagnetic material located on the outside of the pipeline parallel to its axis and connected at the ends with conductors with a current source.

From the description of the patent for utility model of the Russian Federation No. 38214 (IPC 7 F16L 53/00, published May 27, 2003), a heater is known for heating a pipeline for transporting oil, which contains heating blocks, each of which is located around a heated pipeline and includes a heat-insulating layer with an electric heating element mounted in it.

In addition, US publication No. H2139 (IPC F28D 7/10, published January 3, 2006) discloses a system that is a pipeline, in particular for transporting oil, with an elongated tubular element placed inside it, through which the coolant is supplied. The tubular element can also be made in the form of a spiral.

At present, in the construction of oilfield pipelines, pipes with an internal coating are used, which wear out rather quickly. In connection with this problem, an analysis of the wear of such pipelines showed that the main cause is damage to the layer of internal insulation during construction, namely, corrosion protection insulation in winter during the heating of pipes. Construction companies use open uncontrolled flame installations to heat pipes. In this case, heating is carried out by one nozzle, the location of which is at one point, and in order to heat the pipe to the desired temperature from above, it is necessary to overheat it from below.

The disadvantages of all known heaters are premature wear of the pipelines, which entails the cost of funds for constant monitoring of the condition of the pipelines and their repair, insufficient efficiency of the known heaters.

The technical result of the patented invention is the creation of a cheap device for heating pipelines, improving the technological parameters of the device, in particular the intensification of heat transfer, reducing the wear of the pipeline and the cost of its repair and monitoring, as well as reducing the fire safety of the device. The device is easy to manufacture and can be manufactured by a construction company without the use of special equipment.

The claimed technical result is achieved through the use of a device for flameless heating of the pipeline, which is a cylindrical body, connected by means of pipes with at least two collectors and made with the possibility of its placement concentrically on the pipeline with the formation of an annular space between the body and the pipeline for circulation of coolant, the collectors contain an inlet pipe with a burner placed in it and a fan, and the housing is made with POSSIBILITY its axial movement relative to the pipeline.

Moreover, to increase the velocity of the coolant due to the creation of a vortex flow motion in the annular space, and therefore, the intensification of heat transfer, the pipes of one of the collectors should preferably be made at an angle of 10 ° -12 °, and the pipes of another collector should be made at an angle of 170 ° -168 ° relative to the horizontal axis of symmetry of the cross section of the housing.

The uniformity of the heating of the pipeline around the perimeter allows you to intensify heat transfer and reduce wear on the pipelines. This is achieved due to the implementation of the device in the form of a housing connected by means of nozzles with at least two collectors, as well as by the location at the inlet of each collector of the fan and burner device. So, the hot air from the burner is distributed by the fan along each collector and through the nozzles it enters the annular space between the pipeline and the casing, which will evenly heat the pipeline section along the entire perimeter.

In addition, the location of the fans at the inlet of the manifold contributes to the complete combustion of gas and the supply of hot air through the nozzles into the annular space.

The invention is further explained with reference to the figures.

Figure 1 shows a General view of a device for heating pipelines (side view).

Figure 2 - device (front view).

Figure 3 - device (top view).

A prototype installation was tested in the field at the LUKOIL oil field in Western Siberia.

The device is a casing made of a pipe with a diameter of 630 × 8 mm and a length of 4000 mm, which is put on the pipeline 7 under construction and moves with the help of the pipe layer along the pipeline on rollers 4. Two collectors 2 with a diameter of 219 × 6 mm are located on both sides of the casing which from below brings a torch from a gas burner. The flow of hot air enters through the nozzles into the annular space formed by the housing of the heating device and the oil and gas pipeline. Due to the circular motion, hot air swirls and evenly heats the pipeline along the entire length of the heating device.

The nozzles of 3 collectors on the device under test were located at an angle of 10 degrees relative to the horizontal axis.

As a burner, both a gas burner and a liquid fuel burner can be used.

As the tests showed, the cost of work when using the installation is reduced by 10-15% due to economical fuel consumption. But the main advantage of the installation is the quality of construction, pipeline repair and work safety.

Claims (2)

1. A device for flameless heating of the pipeline, which is a cylindrical body, connected by means of pipes with at least two collectors and made with the possibility of its placement concentrically on the pipe with the formation between the body and the pipe of the annular space for circulation of the coolant, while the collectors contain input a nozzle with a burner placed in it and a fan for distributing hot air over the manifold, and the housing is made with the possibility of evogo movement relative to the pipeline. 2. The device according to claim 1, characterized in that the pipes of one of the collectors are made at an angle of 10-12 °, and the pipes of another collector are made at an angle of 168-170 ° to the horizontal axis of symmetry of the cross section of the installation.

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