RU169144U1 - Device for heating metal structures - Google Patents

Device for heating metal structures Download PDF

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Publication number
RU169144U1
RU169144U1 RU2016113794U RU2016113794U RU169144U1 RU 169144 U1 RU169144 U1 RU 169144U1 RU 2016113794 U RU2016113794 U RU 2016113794U RU 2016113794 U RU2016113794 U RU 2016113794U RU 169144 U1 RU169144 U1 RU 169144U1
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RU
Russia
Prior art keywords
metal
heating
shell
device
metal structures
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RU2016113794U
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Russian (ru)
Inventor
Владимир Ананиевич Кузнецов
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Общество с ограниченной ответственностью "Тюменская Электротехническая Компания"
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Priority to RU2016113794U priority Critical patent/RU169144U1/en
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Publication of RU169144U1 publication Critical patent/RU169144U1/en

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/40Heating elements having the shape of rods or tubes
    • H05B3/42Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material

Abstract

The technical solution allows to increase the heating efficiency of metal structures of various shapes, increasing the efficiency when heating metal structures: increasing the heat transfer coefficient K and the total surface area S of the heated metal structures, reducing heat loss when transferring it from a heat source to standard (commercially available ) and non-standard forms of metal construction, and also provides a reduction in the total cost of thermal energy and when heating the metal parts of technological and auxiliary equipment in the cold season, while the device for heating metal structures includes a metal shell, a heat source located inside the shell, in the longitudinal direction, a heat-conducting layer with a thermal conductivity coefficient higher than the thermal conductivity of air, placed inside a metal shell around a source of thermal energy with the possibility of transfer of thermal energy from a source of thermal energy surface of the heated metal structure, the metal shell is arranged to be located on the surface of the heated metal structure, the metal shell is arranged to be located inside the heated metal structure, in addition, the metal shell is a monolithic or prefabricated structure in the form of a metal tube with a rectangular cross section, metal tubes with a circular cross-section, a metal tube with a triangular cross-section,

Description

The utility model relates to electrical engineering, in particular to heating cable technology, and can be used for heating metal structures of various shapes used in various industries during construction, technical re-equipment or reconstruction of construction objects.

Known devices for heating metal structures, such as heating wires and cables containing a conductive core, insulation as indispensable elements, and inside the insulation are protective shells and screens that are used to heat technological equipment of the oil and gas industry, concrete building structures, industrial devices , individual parts of vehicles and household items.

The disadvantages of the above known technical solutions are:

the loss of part of the thermal energy when it is transferred from the source of thermal energy to metal structures through the air gap as a result of which heat is transferred only at the place of their mechanical contact and the area of contact (S) is significantly small compared with the surface area of both the source of thermal energy and metal constructions;

design restrictions when heating non-standard (not commercially available industry) or metal structures of complex shapes.

Known devices for heating metal structures, for example, special heating cable sections using electricity - in this case, the source of thermal energy is a heating cable section; heating thermal satellites in the form of pipes with a special heating cable laid inside - in this case, the heating thermal satellite is a source of thermal energy for heated metal structures; heating thermal companions in the form of pipes with a heating product flowing inside in the form of hot water vapor, hot water and other liquids - in this case, the heating thermal satellite is a source of thermal energy.

The disadvantages of these technical solutions are:

the loss of part of the thermal energy when it is transferred from the source of thermal energy to metal structures, as a result of which heat is transferred only at the place of their mechanical contact and the area of contact (S) is significantly small compared with the surface area of both the source of thermal energy and metal structures;

design restrictions when heating non-standard (not commercially available industry) or metal structures of complex shapes;

as well as the length of metal structures, for example, more than 100 meters in length, since replacing the heating part of an electric heating cable without removing thermal insulation on top of metal structures and a thermal energy source connected to it through the thermal interface is a time-consuming procedure and since removing thermal insulation and fasteners require caution and accuracy to perform reassembly.

The closest technical solution is a heating cable including a sheath, a heat source located inside the sheath in the longitudinal direction (RF patent No. 2334375, Н05В 3/56, published on September 20, 2008, prototype).

The disadvantage of the above technical solution is the loss of part of the thermal energy when transferring it from the source of thermal energy to metal structures, as a result of which heat is partially transmitted only at the place of their mechanical contact and the area of contact (S) is significantly small compared to the surface area as a source of thermal energy and metal structures.

In each of the known technical solutions, the source of thermal energy, the heating part of it, transfers thermal energy with direct mechanical contact between the surfaces of the sources of thermal energy and heated metal structures. To increase the thermal conductivity coefficient K (the unit of measure in the SI system is W / (m * K)) in places of mechanical connections between the metal structure and the heat energy source, a thermal interface is used in the form of a layer of heat-conducting composition, for example, paste, compound, granular mixture, having a thermal conductivity coefficient higher than the coefficient of thermal conductivity of air (0.022 W / (m * K) at a temperature of 300 K and a pressure of 100 kPa).

In this case, the thermal interface layer was placed between the metal structure and the heat source with the maximum amount to ensure a tight connection at the point of mechanical connection. And in most cases, the entire metal structure with a source of thermal energy connected to it through the thermal interface was isolated from the external influence of the air surrounding the metal structure by applying thermal insulation, which reduces the transfer of thermal energy from the structure to the surrounding air. An exception is structures for which thermal insulation is impossible or economically impractical, for example, in cases of heating gutters on the roofs of buildings and structures.

Our technical solution eliminates the above disadvantages and increases the heating efficiency of metal structures of various shapes, increasing the efficiency when heating metal structures: increasing the heat transfer coefficient K and the total surface area S of the heated metal structures, reducing heat loss during transmission from the heat source to standard (mass-produced by industry) and non-standard forms of metal construction, as well as reduces the total cost of thermal energy when heating the metal parts of the technological and auxiliary equipment in the cold season, while the device for heating metal structures includes a shell, a heat source located inside the shell in the longitudinal direction, the shell is a metal shell, heat-conducting layer with a coefficient of thermal conductivity higher than the coefficient of thermal conductivity of air, placed inside a metal shell around the source thermal energy with the possibility of transferring thermal energy from a source of thermal energy to the surface of the heated metal structure, the metal shell is arranged to be located on the surface of the heated metal structure, the metal shell is arranged to be located inside the heated metal structure, in addition, the metal shell is monolithic or prefabricated design in the form of a metal tube with a rectangular cross section, metal tubes with a circular cross-section, a metal tube with a triangular cross-section, a heat-conducting layer with a thermal conductivity coefficient above the thermal conductivity of air is a thermal interface in the form of a liquid-like material, a heat-conducting layer with a thermal conductivity coefficient above a thermal conductivity of an air is a thermal interface in the form of a paste-like material, a heat-conducting layer with a thermal conductivity is higher thermal conductivity of the air is a thermal interface in the form of bulk material, a heat-conducting layer with a coefficient of thermal conductivity higher than the thermal conductivity of air is a thermal interface in the form of a combination of liquid-like, paste-like and bulk materials, a heat-conducting layer with a coefficient of thermal conductivity higher than the thermal conductivity of air is a thermal interface in the form of a combination of liquid-like and bulk material, a heat-conducting layer with a thermal conductivity is higher than thermal conductivity thermal interface in the form of a combination of pasty and loose mater als.

In FIG. 1 shows a device for heating metal structures with a shell in the form of a monolithic metal tube with a circular cross section, FIG. 2 shows a device for heating metal structures with a shell in the form of a monolithic metal tube with a rectangular cross section, FIG. 3 shows a device for heating metal structures with a shell in the form of a monolithic metal tube with a triangular section, FIG. 4 shows a device for heating metal structures with a shell in the form of a monolithic metal tube with a circular cross section, located on the surface of the heated metal structure in the form of a pipeline with the product, FIG. 5 shows a device for heating metal structures with a shell in the form of a monolithic metal tube with a circular cross section, located inside the heated metal structure, which is a product pipeline, in FIG. 6 shows a device for heating metal structures with a shell in the form of a monolithic metal tube with a rectangular cross-section, located on the surface of the heated metal structure in the form of a flat surface located horizontally, in FIG. 7 shows a device for heating metal structures with a shell in the form of a prefabricated metal shell with stiffeners and with a rectangular section.

A device for heating metal structures includes a shell 1, a source of thermal energy 2 and a heat-conducting layer 3 with a coefficient of thermal conductivity K above the coefficient of thermal conductivity of air.

Shell 1 is a metal shell.

The metal shell 1 is made with the possibility of its location on the surface of a heated metal structure or with the possibility of its location inside a heated metal structure and having a design of a given geometric shape.

The metal shell 1 is a metal heat carrier for subsequent transfer of thermal energy from the heat carrier to another heated metal structure - standard (commercially available) and non-standard forms, for example, a tube - a heat trap for heating oil; gas; water pipeline, construction with a duct or corner pressed to a heated metal casing of the heating object.

The metal sheath 1 is a monolithic or prefabricated metal structure, for example a metal tube with a rectangular cross section; a metal tube with a circular cross section; a metal tube with a triangular section.

The metal shell 1 is additionally equipped with stiffeners 4 (Fig. 7).

The thermal energy source 2 is an electric heating element, for example, a heating electric cable, a thermal electric heater (TEN), and is located inside the metal shell 1, in the longitudinal direction, while a thermal energy source 2 with specified parameters is used as the electric heating element 2 molds for heating a specific metal structure, knowing its external and internal structural features.

For example, an electric heating cable 2, consisting of thermal insulation, for example, a flat or rounded structure, in which two conductive conductors are located parallel to each other and which are parallel to the thermal insulation, semiconductor matrices are located between the conductive conductors along the entire length of the section of the electric heating cable under the influence of the passage of electric current through them.

The figures depict options for heating a metal structure using an electric heating cable 2.

The heat-conducting layer 3 with a thermal conductivity coefficient K above the thermal conductivity coefficient of air (hereinafter referred to as the “Heat-conducting layer”) is placed inside the metal shell 1 around the heat source 2 with the possibility of transferring thermal energy from the heat source 2 to the surface of the heated metal structure and is a thermal interface in the form of a liquid-like, paste-like or granular materials, or a combination thereof, for example a combination of a liquid-like, paste-like and granular materials, to the combination of pasty and bulk materials, a combination of liquid and bulk materials, such as thermal grease, slag.

The heat-conducting layer 3 is placed inside the metal shell 1 around the source of thermal energy 2 with full or partial replacement of air.

An example of a specific implementation of the claimed device.

A device for heating metal structures consists of a metal shell 1 in the form of an aluminum tube with a diameter of 32 × 3.2 mm, inside of which is located in the longitudinal direction a source of thermal energy 2 of an electric heating cable 2, consisting of thermal insulation of a flat structure, in which they are parallel to each other two conductive conductors and which are located parallel to the thermal insulation, between conductive conductors throughout the length of the section of the electric heating cable ozheny semiconductor matrix that heat up under the influence of electric current passing through them.

Inside the metal shell 1, a heat-conducting layer 3 is placed in the form of thermal paste around the source of thermal energy 2. In this case, thermal grease 3 is placed in a metal shell 1 with complete replacement of air.

A device for heating metal structures is fixed directly to the wall of the water pipe 5 with the product 6 inside the thermal insulation of the water pipe 5, located above the ground and connected to an adjustable power source with specified parameters.

Thermal grease 3 is filled with the inner cavity of the aluminum tube 1 in a known manner and by known means, for example, a douching method, at temperature conditions at which thermal grease 3 retains its properties. Why use a device for douching, consisting of an air compressor of serial production; tanks with thermal grease 3; a transition sleeve (not shown in FIG.), and a container for the thermal interface material 3 and a transition sleeve are made of known industrial materials using known equipment based on the dimensions of the internal volume of the metal structure intended for heating and its external structural features.

All stages of manufacturing the proposed device can easily be automated using standard equipment and combined into a single technological chain.

The inventive device for heating metal structures can be used to heat metal structures of various shapes used in various industries for construction, technical re-equipment or reconstruction of construction objects, are used in heating devices for various purposes, and especially where maintenance of a positive temperature and high specific heat transfer are required , wherein:

- significantly increases the heat transfer of thermal energy from a source of thermal energy to heated metal structures;

- eliminates design restrictions for heating non-standard (not commercially available industry) or complex hollow metal structures in shape;

- provides the best, in comparison with analogues, heating of extended metal structures, for example, more than 100 meters in length, and also makes it possible to replace the heating part of the heating structure.

The proposed technical solution will increase the heating efficiency of metal structures of various shapes, increasing the efficiency when heating metal structures: increasing the heat transfer coefficient K and the total surface area S of heated metal structures, will reduce the loss of thermal energy when transferring it from a heat source to standard (manufactured by industry commercially) and non-standard forms of metal construction, as well as reduce the total cost of thermal energy ns for heating metal parts processing and auxiliary equipment during the cold days.

The term "cold time" refers to the range of ambient temperatures at the installation sites of metal structures intended for heating. The range of ambient temperatures for the concept of “cold time of day” in this technical solution is taken from the value of the formation of water ice at 0 degrees Celsius and below to the absolute value of the negative ambient temperature in the area of the construction site.

Heating of metal structures by the claimed technical solution will ensure the operability of technological equipment for various purposes in the cold, as well as prevent the formation of ice on metal structures.

Claims (15)

1. A device for heating metal structures, including a shell, a source of thermal energy located inside the shell, in the longitudinal direction,
characterized in that
the shell is a metal shell and it is additionally equipped with a heat-conducting layer with a thermal conductivity coefficient higher than the air thermal conductivity coefficient, located inside the metal shell around the heat energy source with the possibility of transferring thermal energy from the heat source to the surface of the heated metal structure, a heat-conducting layer with a thermal conductivity coefficient higher than the air thermal conductivity It is a thermal interface.
2. A device for heating metal structures according to claim 1, characterized in that the metal shell is made with the possibility of its location on the surface of the heated metal structure.
3. A device for heating metal structures according to claim 1, characterized in that the metal shell is arranged to be located inside a heated metal structure.
4. A device for heating metal structures according to claim 1, characterized in that the metal shell is a monolithic or prefabricated structure.
5. A device for heating metal structures according to claim 1, characterized in that the metal shell is a metal tube with a rectangular cross section.
6. A device for heating metal structures according to claim 1, characterized in that the metal shell is a metal tube with a circular cross section.
7. A device for heating metal structures according to claim 1, characterized in that the metal shell is a metal tube with a triangular section.
8. A device for heating metal structures according to claim 1, characterized in that the thermal interface is a liquid-like material.
9. A device for heating metal structures according to claim 1, characterized in that the thermal interface is a paste-like material.
10. A device for heating metal structures according to claim 1, characterized in that the thermal interface is a bulk material.
11. A device for heating metal structures according to claim 1, characterized in that the thermal interface is a combination of liquid-like, paste-like and granular materials.
12. A device for heating metal structures according to claim 1, characterized in that the thermal interface is a combination of liquid-like and granular materials.
13. A device for heating metal structures according to claim 1, characterized in that the thermal interface is a combination of pasty and bulk materials.
RU2016113794U 2016-04-11 2016-04-11 Device for heating metal structures RU169144U1 (en)

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RU2016113794U RU169144U1 (en) 2016-04-11 2016-04-11 Device for heating metal structures

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2663366C1 (en) * 2017-09-27 2018-08-03 Акционерное общество НАУЧНО-ТЕХНИЧЕСКИЙ ЦЕНТР "ЭНЕРГОСБЕРЕЖЕНИЕ" Method for heating metallic wall shell
RU2666843C1 (en) * 2017-09-13 2018-09-12 Акционерное общество НАУЧНО-ТЕХНИЧЕСКИЙ ЦЕНТР "ЭНЕРГОСБЕРЕЖЕНИЕ" Heating element of device for heating industrial objects

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7019269B2 (en) * 2001-08-13 2006-03-28 Sanyo Netsukogyo Kabushiki Kaisha Heater
RU2286653C1 (en) * 2005-04-12 2006-10-27 Государственное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" Tubular electric heater
RU2561620C1 (en) * 2014-06-10 2015-08-27 Евгений Сергеевич Ляховский Tubular electric heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7019269B2 (en) * 2001-08-13 2006-03-28 Sanyo Netsukogyo Kabushiki Kaisha Heater
RU2286653C1 (en) * 2005-04-12 2006-10-27 Государственное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" Tubular electric heater
RU2561620C1 (en) * 2014-06-10 2015-08-27 Евгений Сергеевич Ляховский Tubular electric heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2666843C1 (en) * 2017-09-13 2018-09-12 Акционерное общество НАУЧНО-ТЕХНИЧЕСКИЙ ЦЕНТР "ЭНЕРГОСБЕРЕЖЕНИЕ" Heating element of device for heating industrial objects
RU2663366C1 (en) * 2017-09-27 2018-08-03 Акционерное общество НАУЧНО-ТЕХНИЧЕСКИЙ ЦЕНТР "ЭНЕРГОСБЕРЕЖЕНИЕ" Method for heating metallic wall shell

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Effective date: 20180412