Pipeline heat tracing device

Abstract

The utility model discloses a pipeline heat tracing device which comprises a planar heating body, a shielding layer, a heat preservation layer and an anti-explosion shell which wrap the periphery of a pipeline and are sequentially arranged from inside to outside in the radial direction of the pipeline. The planar heating body comprises an upper packaging layer, a heating layer, a heating substrate layer and a lower packaging layer which are sequentially arranged from inside to outside in the radial direction of the pipeline. The utility model provides a pipeline heat tracing device. The pipeline heat tracing device comprises a planar heating body, a shielding layer, a heat preservation layer and an anti-explosion shell which wrap the periphery of a pipeline and are sequentially arranged from inside to outside in the radial direction of the pipeline. The planar heating body comprises an upper packaging layer, a heating layer, a heating substrate layer and a lower packaging layer which are sequentially arranged from inside to outside in the radial direction of the pipeline. Compared with the prior art, the contact area of the planar electrothermal film and the pipeline is large, the generated heat is directly conducted into the pipeline, and compared with a heating cable, the heating cable has more advantages. The pipeline heat tracing device has certain anti-explosion requirements in environments such as oil wells, so that the anti-explosion shell is arranged on the outermost layer of the pipeline heat tracing device, and the anti-explosion effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating devices, and more specifically, to a pipeline heating device. Background Art

[0002] Liquids with high viscosity, such as crude oil and heavy oil, are easy to solidify at low temperatures, causing blockage in the transmission pipeline, so heating is required. Common heating methods include hot water, steam, heat carrier and electric heating. The heating methods using the above three heating media include internal heating pipe heating, external heating pipe heating and jacket heating. The internal heating pipe is to install the heating pipe inside the process pipeline. The heating medium of this method is mainly steam, and the advantage is high thermal efficiency. However, this heating method cannot be used for pipelines that transport corrosive and heat-sensitive media, and the engineering volume is large. After the deformation of the heating pipe, it is easy to cause accidents such as expansion and cracking of the heating pipe. Jacket heating is to install a casing outside the heating pipe to be heated, and steam medium is used in the casing. Jacket heating consumes a lot of steel and the construction project is large, so it is mainly used in pipelines that transport low solidification point and high melting point media. The external heating pipe uses steam and hot water as the heating medium, and the heating pipe is attached to the outside of the pipeline to supplement the heat loss of the pipeline. External heating pipes, external heating methods are more widely applicable due to the convenience of construction, production management and maintenance. However, the total energy consumption of the steam heating system is usually 20 times the actual energy required to keep the pipe at the required temperature. The steam heating system is difficult to control the temperature, and improper temperature adjustment will cause local overheating of materials. In addition to the original installation, hot water and steam heating pipelines are prone to "running, bubbling, dripping, and leaking" when running at low temperatures in winter. Pipeline maintenance and steam trap inspection or replacement require high costs.

[0003] Electric heating is easy to install and maintain because of its external heating method. At present, the products used for electric heating are linear heating cables. The problem with the linear heating method is that the heating cable is thin and the contact surface with the transmission pipeline is small, resulting in low heating efficiency, uneven heat transfer and high energy consumption. In a low temperature environment, the heat generated by the heating cable cannot reach the heat required for heating, resulting in wax deposition.

[0004] Therefore, how to provide a pipe heating device that can generate heat to meet the heat required for heating in a low-temperature environment has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The utility model aims to provide a pipeline heating device which can generate heat to meet the heat required for heating.

[0006] The utility model provides a pipeline heating device, comprising: a planar heating element, a shielding layer, a heat-insulating layer and an explosion-proof outer shell, which are wrapped around the outer circumference of the pipeline and arranged in sequence from the inside to the outside along the radial direction of the pipeline; the planar heating element comprises an upper packaging layer, a heating layer, a heating base layer and a lower packaging layer, which are arranged in sequence from the inside to the outside along the radial direction of the pipeline.

[0007] Optionally, the material used to make the heating layer includes one of a conductive metal film, a conductive boride, a conductive carbide, a conductive nitride, a conductive sulfide, and a conductive oxide.

[0008] Optionally, the material of the heating base layer includes silicon oxide or silicon nitride;

[0009] And / or, the material of the upper encapsulation layer and the lower encapsulation layer includes one of PET, BOPET, PI, and PC.

[0010] Optionally, the shielding layer comprises a mesh shielding layer.

[0011] Optionally, the mesh shielding layer includes a fence-shaped grid, a square grid, a regular triangle grid and a regular hexagonal grid.

[0012] Optionally, the pipeline heating device further includes a temperature sensor, and the temperature sensor is arranged on a side of the planar heating element close to the pipeline.

[0013] Optionally, the pipeline heating device also includes a temperature control system, and the temperature control system is electrically connected to the temperature sensor and the planar heating element respectively.

[0014] Optionally, the pipeline heating device also includes an explosion-proof terminal, and after the shielding layer is connected to the neutral wire of the heating film, the explosion-proof terminal is installed at the connecting wire port; the explosion-proof terminal is wrapped inside the explosion-proof casing and is used to connect two adjacent pipeline heating devices.

[0015] Optionally, the material used to make the thermal insulation layer includes one of polyurethane, aerogel and rubber-plastic cotton.

[0016] Optionally, the explosion-proof housing includes a socket extending in the length direction, and the explosion-proof housing has connecting vertical plates extending along the radial direction and away from the axis on opposite sides of the socket, and the two oppositely arranged connecting vertical plates can be fastened and connected by fasteners;

[0017] Alternatively, the explosion-proof casing includes a socket extending through the length direction, and a U-shaped slot portion and a clamping portion are respectively extended and connected on opposite sides of the socket and on the outer periphery of the explosion-proof casing. The slot portion and the clamping portion are clamped together and matched in the circumferential upper limit position of the explosion-proof casing, and the notch of the slot portion faces the explosion-proof casing.

[0018] According to the technical content disclosed in the utility model, the following beneficial effects are achieved:

[0019] The pipe heating device provided by the utility model includes: a planar heating element, a shielding layer, a heat-insulating layer and an explosion-proof shell wrapped around the outer circumference of the pipe and arranged in sequence from the inside to the outside along the radial direction of the pipe; the planar heating element includes an upper packaging layer, a heating layer, a heating base layer and a lower packaging layer arranged in sequence from the inside to the outside along the radial direction of the pipe. In contrast, the planar electric heating film has a large contact area with the pipe, and the heat generated is directly conducted to the inside of the pipe, which is more advantageous than the heating cable. There is a certain demand for explosion-proof in environments such as oil wells, so the outermost layer of the pipe heating device is provided with an explosion-proof shell to achieve an explosion-proof effect.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 This is a cross-sectional view of the first state of the pipeline heating device of Example 1 of the utility model.

[0023] Figure 2 This is a cross-sectional view of the second state of the pipeline heating device of the first embodiment of the utility model.

[0024] Figure 3 This is a schematic diagram of the structure of a pipeline heating device according to Embodiment 1 of the present utility model.

[0025] Figure 4 This is a schematic diagram of the first structure of the mesh shielding layer of the first embodiment of the utility model.

[0026] Figure 5 This is a schematic diagram of the second structure of the mesh shielding layer of the first embodiment of the utility model.

[0027] Figure 6 This is a schematic diagram of the third structure of the mesh shielding layer of the first embodiment of the utility model.

[0028] Figure 7 This is a schematic diagram of the fourth structure of the mesh shielding layer of the first embodiment of the utility model.

[0029] Figure 8 It is a cross-sectional schematic diagram of a pipeline heating device according to Embodiment 2 of the present utility model.

[0030] Fig. 9 This is a schematic diagram of the structure of a pipeline heating device according to Embodiment 2 of the present utility model.

[0031] Explanation of the reference numerals: 1. explosion-proof housing; 101. connecting vertical plate; 102. through hole; 2. shielding layer; 3. temperature sensor; 4. explosion-proof terminal; 5. pipeline; 6. insulation layer; 7. heating element; 8. slot portion; 9. snap-on portion. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] Embodiment 1:

[0038] See also Figures 1 to 3 The utility model discloses a pipeline heating device, comprising: a planar heating element 7 wrapped around the outer periphery of a pipeline 5 and arranged in sequence from the inside to the outside along the radial direction of the pipeline 5, a shielding layer 2, a heat-insulating layer 6, an explosion-proof housing 1, an explosion-proof terminal 4, a temperature sensor 3, and a temperature control system. The temperature sensor 3 is arranged on a side of the planar heating element 7 close to the pipeline 5, and the temperature control system is electrically connected to the temperature sensor 3 and the planar heating element 7, respectively.

[0039] The planar heating element 7 is made of a low-resistance planar new type of heating material. Specifically, the planar heating element 7 includes an upper packaging layer, a heating layer, a heating base layer, and a lower packaging layer arranged in sequence from the inside to the outside along the radial direction of the pipeline 5. The heating layer is a conductive metal film, a conductive boride, a conductive carbide, a conductive nitride, a conductive sulfide, and a conductive oxide, which constitutes a low-resistance heating element 7.

[0040] The heating base layer is composed of silicon oxide or silicon nitride. The upper encapsulation layer and the lower encapsulation layer are made of one of PET (polyethylene terephthalate), BOPET (biaxially oriented polyester film), PI (polyimide), and PC (polycarbonate). The shielding layer 2 is a mesh shielding layer, which includes Figure 4 The fence-shaped grid shown, Figure 5 The square grid shown, Figure 6 The regular triangle mesh and Figure 7 The regular hexagonal grid shown. The material of the thermal insulation layer 6 includes one of polyurethane, aerogel and rubber-plastic cotton.

[0041] The low-resistance planar heating element 7 can heat up quickly under a specific voltage, and the heat can be quickly transferred to the metal pipe 5 for heating and insulation. After the prepared heating layer is encapsulated by the upper and lower modified PET, a mesh shielding layer is installed on one side. The mesh shielding layer has a greater resistance than the planar shielding layer to prevent phenomena such as breakdown and failure of the heating element 7. The planar shielding layer has a low resistance, and after piercing, the current will break through the heating element 7, and the heating element 7 will fail (for example, if the shielding layer 2 uses traditional aluminum foil, which is not a mesh but a planar surface, the planar shielding layer has a low resistance, and after piercing, the current will break through the heating film, and the heating film will fail).

[0042] The temperature probe is fixed at a suitable position on the side where the heat-generating material contacts the pipe 5 , and the heat-insulating material of required thickness is attached to the outside of the shielding layer 2 .

[0043] The explosion-proof housing 1 includes a socket that runs through the length direction. The explosion-proof housing 1 has connecting vertical plates 101 extending along its radial direction and in the direction away from its axis on opposite sides of the socket. The two oppositely arranged connecting vertical plates 101 can be fastened and connected by fasteners. After the required thickness of the thermal insulation material is attached to the outside of the shielding layer 2, the explosion-proof housing 1 is sleeved on the outer periphery of the pipe 5 from the socket of the explosion-proof housing 1, and bolts are passed through the oppositely arranged through holes 102 on the two connecting vertical plates 101. The explosion-proof housing 1 and the heating device are fixed on the pipe 5 by tightening the bolts (metal buckles are installed on the housing to facilitate the heating device, which is installed and fixed on the pipe 5 to be heated). In the power connection part, after the shielding layer 2 is connected to the neutral line of the heating film, an explosion-proof terminal 4 is installed at the connecting line port. The explosion-proof terminal 4 is wrapped inside the explosion-proof housing 1 and can be used to connect two adjacent pipe heating devices, which is convenient for connection with the control end. The pipeline heating device of the utility model is mainly used in petroleum or petrochemical sites, because there is combustion-supporting gas on the site and if there is no protective shell, there will be explosion danger if electric sparks are generated.

[0044] Embodiment 2:

[0045] In this embodiment, the overall structure is the same as that of the first embodiment, and the main difference is that: the explosion-proof shell 1 includes a socket running through the length direction, and the explosion-proof shell 1 is respectively connected with a U-shaped slot portion 8 and a clamping portion 9 extending on opposite sides of the socket and on the outer periphery of the explosion-proof shell, the slot portion 8 and the clamping portion 9 are clamped with each other and matched in the circumferential upper limit of the explosion-proof shell 1, and the notch of the slot portion 8 faces the explosion-proof shell 1; the slot portion 8 and the clamping portion 9 of the buckle structure are provided to realize the rapid installation of the explosion-proof shell 1, and the slot portion 8 is a U-shaped structure, and the notch of the slot portion 8 faces the explosion-proof shell 1, and the clamping portion 9 is inserted in the U-shaped structure without being exposed, and because the slot portion 8 and the clamping portion 9 generate opposite directions of force in the circumferential direction of the explosion-proof shell 1, a side wall of the clamping portion 9 is tightly attached to the inner wall of the slot portion 8, and the sealing of the socket of the explosion-proof shell 1 is structurally realized, which can prevent rainwater from seeping into the socket of the explosion-proof shell 1.

[0046] Embodiment three:

[0047] In this embodiment, the overall structure is the same as that of the first embodiment, and the main difference is that the explosion-proof housing 1 includes a first shell and a second shell having curved surfaces that can relatively form a cylindrical shell. After the insulation material of the required thickness is attached to the outside of the shielding layer, the first shell and the second shell with two curved surfaces are fixed and shaped, and the breakpoint of the shell is extended outward by 2-3 cm to form a connecting vertical plate, and holes are punched to facilitate the use of screws to fix the heating device on the pipeline (metal buckles are installed on the shell to facilitate the heating device to be installed and fixed on the pipeline to be heated).

[0048] The shell of the utility model meets the explosion-proof requirements, and the terminal connection also meets the explosion-proof requirements. Therefore, the heating device is also used in petroleum, petrochemical and other environments with explosion-proof requirements. The temperature probe of the temperature sensor 3 collects the external temperature of the pipeline 5. The collected data is finally presented in the temperature control system as the temperature inside the pipeline 5 after the correction program in the temperature control system. And according to the required temperature of the heating liquid, after the corresponding temperature is set in the temperature control system, the heating element 7 will work according to the power of the temperature rise. In seasons such as spring and summer, if the weather is hot and the temperature rise of the liquid in the pipe is low, the heating element 7 does not need to work at full power to reduce energy consumption. The width and length of the pipeline heating device are determined by the required diameter and length of the heating pipeline 5. The two heating devices can be connected to each other through the explosion-proof terminal 4.

[0049] In summary, the heating material used in the pipe heating device provided by the utility model is a planar heating material, which generates heat more evenly. After being attached to the metal pipe 5, the heating area is increased by about 120 times compared with the electric heating tape (for example, a DN70 pipe), and the heat can be better transferred to the inside of the pipe 5, and the heating efficiency is higher. The heating material used in the utility model has a low surface resistance, so the heating speed is faster and the equilibrium temperature is higher. The heating tape product has a complete explosion-proof product system, and the planar heating film does not have corresponding explosion-proof measures and cannot be used in explosion-proof heating scenarios. Therefore, the utility model adopts an explosion-proof casing to play a role of explosion-proof. And the connection method does not use a connecting wire but uses an explosion-proof terminal 4, which meets the explosion-proof requirements. The connection between the explosion-proof terminal 4 and the electrode is also inside the explosion-proof casing 1, which is safer.

[0050] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A pipeline heating device, characterized in that: include: A planar heating element, a shielding layer, a heat-insulating layer and an explosion-proof housing are wrapped around the outer circumference of the pipeline and arranged in sequence from the inside to the outside along the radial direction of the pipeline; The planar heating element comprises an upper packaging layer, a heating layer, a heating base layer, and a lower packaging layer which are sequentially arranged from the inside to the outside along the radial direction of the pipeline.

2. The pipeline heating device according to claim 1, characterized in that: The material used to make the heating layer includes one of a conductive metal film, a conductive boride, a conductive carbide, a conductive nitride, a conductive sulfide, and a conductive oxide.

3. The pipeline heating device according to claim 2, characterized in that: The material of the heating base layer includes silicon oxide or silicon nitride; And / or, the upper encapsulation layer and the lower encapsulation layer are made of a material selected from the group consisting of PET, BOPET, PI, and PC.

4. The pipeline heating device according to any one of claims 1 to 3, characterized in that: The shielding layer comprises a mesh shielding layer.

5. The pipeline heating device according to claim 4, characterized in that: The mesh shielding layer includes a fence-shaped grid, a square grid, a regular triangle grid and a regular hexagonal grid.

6. The pipeline heating device according to any one of claims 1 to 3, characterized in that: The pipeline heating device also includes a temperature sensor, which is arranged on a side of the planar heating element close to the pipeline.

7. The pipeline heating device according to claim 6, characterized in that: The pipeline heating device also includes a temperature control system, and the temperature control system is electrically connected to the temperature sensor and the planar heating element respectively.

8. The pipeline heating device according to any one of claims 1 to 3, characterized in that: The pipeline heating device also includes an explosion-proof terminal, which is installed at the connecting line port after the shielding layer is connected to the neutral wire of the heating film; the explosion-proof terminal is wrapped inside the explosion-proof shell and is used to connect two adjacent pipeline heating devices.

9. The pipeline heating device according to any one of claims 1 to 3, characterized in that: The thermal insulation layer is made of a material selected from the group consisting of polyurethane, aerogel and rubber-plastic cotton.

10. The pipeline heating device according to any one of claims 1 to 3, characterized in that: The explosion-proof housing comprises a socket extending in the length direction, and the explosion-proof housing has connecting vertical plates extending along the radial direction and away from the axis on opposite sides of the socket, and the two connecting vertical plates arranged opposite to each other can be fastened and connected by fasteners; Alternatively, the explosion-proof shell includes a socket extending through the length direction, and a U-shaped slot portion and a clamping portion are respectively extended and connected on opposite sides of the socket and on the outer periphery of the explosion-proof shell, the slot portion and the clamping portion are clamped with each other and cooperate in the circumferential upper limit position of the explosion-proof shell, and the notch of the slot portion faces the explosion-proof shell.

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