RU213808U1 - PIPE WITH ELECTRIC HEATING OF TRANSPORTING MEDIUM - Google Patents

Abstract

The utility model relates to the field of pipeline transport of liquid, gaseous and viscous fluids and can be used in pipelines for various purposes, in particular in field and main oil pipelines, in technological product pipelines, in production wells and other areas. The utility model is applicable at facilities in the oil and gas industry, chemical, food and other industries, where liquid, gaseous and viscous media are transported through pipelines. The technical result is an increase in the thermal efficiency of the device associated with an increase in the efficiency of heating the transported medium and a decrease in heat loss. An additional result is an increase in the compressive strength of the claimed pipe. This technical result is achieved by the fact that the pipe with the system of electric heating of the transporting medium includes an inner pipe, around which two rows of heating wire are wound in a spiral, on top of which a heat-insulating layer and an external protective-insulating coating are placed. 4 w.p. f-ly, 2 ill.

Description

The utility model relates to the field of pipeline transport of liquid, gaseous and viscous fluids and can be used in pipelines for various purposes, in particular in field and main oil pipelines, in technological product pipelines, in production wells and other areas. The utility model is applicable at facilities in the oil and gas industry, chemical, food and other industries, where liquid, gaseous and viscous fluids are transported through pipelines.

The problem of freezing of the transporting medium has existed for a long time and in the period of an unstable temperature climate, when large frosts are possible where they were not observed before, they appear more often.

In this regard, the purpose of the proposed utility model is to create a pipe for transporting and heating media that eliminates these known problems.

From RU 147579 U1, November 10, 2014, a pipeline with an electric heating system is known, containing an umbilical cable consisting of a working pipe, along the entire length of which a heating element is installed, enclosed in an outer sheath, while a high-resistance conductor wound around the working pipe is used as a heating element, and on top of the high-resistance conductor, two non-crossing insulated low-resistance conductors are laid around the working pipe, the first and second low-resistance conductors are alternately electrically connected to the high-resistance conductor in separate places of their crossing along the laying path, spaced from each other at different distances, the pipe has a heat-insulating layer placed between the heating element and outer sheath and between working tube and outer insulation.

The disadvantage of this device is that it does not provide heating of the transport medium, since it has an internal insulator in front of the heating system, has a complex design, is electrically unsafe, and is difficult to manufacture (using welding and soldering).

The closest to the proposed utility model in terms of technical essence is patent RU 2727717 C1, 01/27/2006, which discloses an electric heating system for a pipeline containing a pipe and thermal insulation around it, three heating resistive cables connected to three phases of a three-phase power system, each the aforementioned resistive cable is placed inside a separately located guide element, fixed directly on the outer side of the pipe under its thermal insulation, while the screens of each resistive cable have intermediate and end grounds, and are also interconnected at the ends of the pipeline.

The disadvantage of this device is the low efficiency of heating the conveying medium, large heat losses, uneven heating of the medium, low compressive strength of the pipe.

This utility model is based on the task of developing a pipe design with an electric heating system for the transport medium, which eliminates these disadvantages.

The technical result is an increase in the thermal efficiency of the device associated with an increase in the efficiency of heating the transported medium and a decrease in heat loss. An additional result is an increase in the compressive strength of the claimed pipe.

This technical result is achieved by the fact that the pipe with the system of electric heating of the transporting medium includes an inner pipe around which two rows of heating wire are wound in a spiral, on top of which a heat-insulating layer and an external protective-insulating coating are placed.

The heat insulating layer includes an inner foiled reflective layer and an outer insulating layer.

The device additionally includes heat-dissipating plates laid in parallel with the heating wire.

The heat-dissipating plates are recessed inside the inner tube.

The inner tube includes a metal wire within its thickness.

Further, the proposed utility model will be considered in detail, taking into account the illustration, where

in fig. 1 shows a general view of a pipe with an electric heating system for the transport medium without a heat-insulating layer and a protective-insulating coating,

in fig. 2 - view of a pipe with an electric heating system for a transport medium with a heat-insulating layer and a protective-insulating coating, in section, where

1 - inner pipe;

2 - heating wire;

3 - heat-insulating layer;

4 - protective and insulating coating.

A pipe with an electric heating system for a conveying medium (liquid, gaseous and viscous media) includes an inner pipe 1. The inner pipe 1 is usually made of PVC material, but it can also be made of other polymers, metals and alloys. It is preferable to introduce a metal wire inside the thickness (wall) of the inner tube 1, for example, made of aluminum, copper, etc., which provides additional reinforcement and improves heat transfer from the heating wire 2 to the transport medium, according to the principle of a heat conductor. The placement of this wire can be different, for example, straight, in a spiral, with an inclination, etc.

The pipe has different lengths, for example 4 m, and is joined to the next pipe to form a conduit with a common heating circuit. Preferably, the pipe is provided with quick-detachable connections to speed up their joining in the pipeline with each other. Heating wires 2 are also interconnected on each pipe to form a common circuit in the pipeline.

Two rows of heating wire 2 are wound in a spiral around the inner tube 1. The spiral winding provides a more uniform heat distribution throughout the tube, a larger area of the heating coating and a greater compressive strength of the pipe, since each spiral ring increases the strength of the pipe. The winding step is selected based on the tasks assigned to the pipe, the required degree of heating of the conveying medium, the required compressive strength of the pipe and other factors. Wire 2 consists, as a rule, of one or more heating wires, electrical insulation, a heat-dissipating layer and an outer sheath. The design of the heating wire 2 may be different and is not the subject of protection in this application, however, the heating wires must always be present in order for the wire 2 to perform its function of heating.

A heat-insulating layer 3 is placed on top of the heating wire 2. The heat-insulating layer can be made of various materials and have a different design. It is preferable to make the heat-insulating layer 3 from two layers - an inner foiled reflective layer and an outer insulating layer, for example, based on foamed polyethylene, fiberglass, foamed rubber, etc. The inner foiled reflective layer additionally shields and reflects heat inward, increasing the thermal efficiency of the device and reducing heat loss. On top of the heat-insulating layer 3, an external protective-insulating coating 4 is placed. This coating provides additional thermal insulation, and also protects the pipe from external damage and possible formation of cold bridges. The outer protective and insulating coating 4 can be made of various materials, such as PVC, rubber, tar, etc. It is preferable that this coating be applied by pouring, thereby reliably fixing the pipe structure, eliminating displacement and damage to the layers and passing through these places of cold inside and heat outlet to the outside of the pipe (exclusion of heat loss).

The device may additionally include heat-dissipating plates (not shown in the drawings) laid in parallel with the heating wire 2. These plates are placed in contact with the inner pipe 1. Alternatively, the heat-dissipating plates can be recessed inside the inner pipe 1, for example, by making recesses on the surface pipes 1 or by heating the plate and partially soldering the plates into the surface of the pipe 1. These plates provide a large area of heat distribution to the transported liquid, which increases the energy efficiency of the device, and the deepening of the plates shortens the path to heat transfer to the transporting liquid.

Example 1

The pipe with the system of electric heating of the conveying medium includes an inner pipe 1 made of PVC, around which two rows of heating wire 2 are wound in a spiral. The winding pitch is 30 cm.

Heat-insulating layer 3 is made of polyethylene foam.

The outer protective and insulating coating 4 is made of PVC and applied by pouring.

Example 2

The pipe with the system of electric heating of the conveying medium includes an inner pipe 1 made of PVC, around which two rows of heating wire 2 are wound in a spiral. The winding pitch is 10 cm.

The heat-insulating layer 3 is made of two layers - an inner foiled reflective layer and an outer insulating layer based on foamed rubber.

The outer protective-insulating coating 4 is made of tar and applied by pouring.

Example 3

The pipe with the system of electric heating of the conveying medium includes an inner pipe 1 made of aluminum, around which two rows of heating wire 2 are wound in a spiral. The winding pitch is 7.5 cm.

The heat-insulating layer 3 is made of a rubber tube.

The outer protective-insulating coating 4 is made of a PVC tube.

Example 4

The pipe with the system of electric heating of the transporting medium includes an inner pipe 1 made of PVC with a copper wire included in its wall. Two rows of heating wire 2 are wound in a spiral around the pipe. The winding pitch is 6 cm. The device additionally includes heat-dissipating plates laid in parallel with heating wire 2.

The heat-insulating layer 3 is made of two layers - an inner foiled reflective layer and an outer insulating layer based on foamed rubber.

The outer protective-insulating coating 4 is made of tar and applied by winding layers.

The proposed device provides an increase in the thermal efficiency of the device, associated with an increase in the efficiency of heating the transported medium and a decrease in heat loss. It also provides an increase in the compressive strength of the claimed pipe.

Claims (4)

1. A pipe with an electrically heated conveying medium, characterized in that it includes an inner pipe around which two rows of heating wire are wound in a spiral, on top of which a heat-insulating layer is placed, including an inner foil reflective layer, and an outer insulating layer, and an outer protective-insulating coating . 2. A pipe with an electric heating system for the transport medium according to claim 1, characterized in that it includes heat-dissipating plates laid in parallel with the heating wire. 3. A pipe with an electric heating system for the transporting medium according to claim 2, characterized in that the heat-dissipating plates are recessed inside the inner pipe. 4. A pipe with an electric heating system for the conveying medium according to claim 1, characterized in that the inner pipe includes a metal wire within its thickness.

Images