CN210770955U

CN210770955U - Heat tracing pipeline

Info

Publication number: CN210770955U
Application number: CN201921314398.0U
Authority: CN
Inventors: 王志超
Original assignee: Shenhua Shendong Power Co Ltd; Dianta Power Generating Co of Shenhua Shendong Power Co Ltd
Current assignee: Shenhua Shendong Power Co Ltd; Dianta Power Generating Co of Shenhua Shendong Power Co Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-16
Anticipated expiration: 2029-08-13

Abstract

The application discloses a heat tracing pipeline. The heat tracing pipeline comprises a pipeline body and a heat tracing layer wrapped on the outer surface of the pipeline body, wherein the heat tracing layer comprises a plurality of sub-layers which are arranged in a stacking mode in the radial outward direction. According to the utility model discloses a heat tracing pipe stage property has the heat tracing layer, and the pipeline body can be heated and guaranteed at the predetermined temperature like this.

Description

Heat tracing pipeline

Technical Field

The application relates to the field of industrial equipment, in particular to a heat tracing pipeline.

Background

In chemical plants, thermal power plants and the like, it is often necessary to sample the fluid in the pipeline on-line for real-time monitoring, which needs to be done by means of a sampling tube. In the north, the weather is cold in winter, and the condensation in the sampling pipe is easily caused, so that the sampling is inaccurate, and the analysis and test data are influenced. For this reason, improvements are required.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a heat tracing pipeline. According to the utility model discloses a heat tracing pipe stage property has the heat tracing layer, and the pipeline body can be heated and guaranteed at the predetermined temperature like this.

According to the utility model discloses a heat tracing pipeline, establish including the pipeline body to and the package companion's layer on the pipeline body surface, wherein, companion's layer includes a plurality of sublayers, a plurality of sublayers are along the range upon range of setting of radial outside direction.

In one embodiment, the plurality of sub-layers comprises an inner sub-layer adjacent to the pipe body and an outer sub-layer radially outside the inner sub-layer, the inner sub-layer comprises heat tracing sections intermittently distributed along the axial direction of the pipe body, and the outer sub-layer covers at least gaps between adjacent heat tracing sections of the inner sub-layer.

In one embodiment, the inner sub-layer is heating wire heat tracing or jacket heat tracing.

In one embodiment, the outer sublayer is configured to extend entirely in an axial direction of the pipe body.

In one embodiment, the outer sub-layer is a heating wire heat tracing.

In one embodiment, the outer sublayer comprises a first section corresponding to the gap and a second section corresponding to the heat tracing section, the first section having a density of turns of heating wire being greater than the density of turns of heating wire of the second section.

In one embodiment, the heating wires of the outer sub-layer comprise at least two parallel wires.

In one embodiment, a first heat-insulating layer is arranged between adjacent sub-layers of the heat tracing layer, a second heat-insulating layer is arranged on the radial outer surface of the heat tracing layer, and the thickness of the first heat-insulating layer is smaller than that of the second heat-insulating layer.

In one embodiment, the first insulating layer has a thickness of less than 2 centimeters; the thickness of the second heat-insulating layer is more than or equal to 2 cm.

In one embodiment, the second layer of insulation is wrapped around the pipe body.

Compared with the prior art, the beneficial effects of the utility model are as follows: according to the utility model discloses a heat tracing pipe stage property has the heat tracing layer, and the pipeline body can be heated and guaranteed at the predetermined temperature like this, avoids appearing the accident. Furthermore, the heat trace layer comprises a plurality of radially arranged sub-layers. The heating action of the sub-layers can be mutually compensated, so that the temperature in the pipeline body can be ensured to be the preset temperature, and the using effect of the heat tracing pipeline is further ensured. When the pipeline body is used as a sampling pipe, the heating of the heat tracing layer can prevent condensation in the sampling pipe, so that the sampling accuracy and the accuracy of analyzing test data are ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 schematically shows the overall structure of a heat-traced pipe according to an embodiment of the present invention.

Fig. 2 schematically shows a heat trace form of a heat trace pipe according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 schematically shows the overall structure of a heat-traced pipe 1 according to an embodiment of the present invention. As shown in fig. 1, the heat trace pipeline 1 includes a pipeline body 100 and a heat trace layer 300 wrapped on an outer surface of the pipeline body 100. The heat tracing layer 300 includes a plurality of sub-layers 301, and the plurality of sub-layers 301 are stacked in a radially outward direction.

In the heat tracing pipe 1 of the present application, the heat tracing layer 300 may heat the pipe body 100, so that even if the ambient temperature is low, the heat tracing layer 300 may ensure that the internal temperature of the pipe body 100 is at a predetermined value, thereby avoiding an accident. When the pipe body 100 is used as a sampling pipe, the heating of the heat tracing layer 300 can prevent dew condensation in the sampling pipe, thereby ensuring the accuracy of sampling and the accuracy of analyzing test data.

In addition, the heat trace layer 300 includes a plurality of sub-layers 301, and the heating effects of the sub-layers 301 can compensate each other, for example, when the inner heat trace layer is damaged, the outer heat trace layer can compensate the heating. Thus, the temperature in the pipeline body 100 can be ensured to be the preset temperature, and the using effect of the heat tracing pipeline 1 is further ensured.

The pipe body 100 may be a circular pipe, a square pipe or an oval pipe, and the heat trace layer 300 is shaped to conform to the shape of the pipe body 100.

As shown in fig. 1, the plurality of sub-layers 301 includes an inner sub-layer 302 proximate the pipe body 100 and an outer sub-layer 303 radially outward of the inner sub-layer 302. The inner sub-layer 302 comprises heat tracing segments 304 intermittently distributed along the axial direction of the pipe body 100, and the outer sub-layer 303 covers at least the gaps 305 between adjacent heat tracing segments 304 of the inner sub-layer 302. The inventors have found that when one or some of the heat trace sections 304 of the inner sub-layer 302 are not heated, the section of the outer sub-layer 303 corresponding to the gap 305 may be heated normally, such that the non-heated heat trace sections 304 of the inner sub-layer 302 are compensated for by the section of the outer sub-layer 303. Thus, the pipe body 100 as a whole is still heated by the heat trace layer 300 (i.e., the pipe body 100 as a whole is heated by the outer sub-layer 303 together with the normally operating heat trace section 304 of the inner sub-layer 302), so that the temperature inside the pipe body 100 can still be guaranteed to be a predetermined temperature, and thus the normal operation is not affected during the overhaul. In particular, when the pipe body 100 is used as a sampling pipe, the above-mentioned cooperation of the outer sublayer 303 and the inner sublayer 302 still prevents condensation in the sampling pipe, thereby ensuring the accuracy of sampling and the accuracy of analyzing test data.

In one embodiment, the inner sublayer 302 is heating wire heat tracing or jacket heat tracing. As shown in fig. 1, resistance wires 306 are wound around a plurality of tube sections of the pipe body 100 to form heating wire heat tracing. As shown in fig. 2, a jacket 500 is constructed on a plurality of pipe segments of the pipe body 100. The jacket 500 may be filled with flowing hot water, hot steam or hot oil, thereby forming jacket tracing.

In one embodiment, the outer sublayer 303 is configured to extend entirely in the axial direction of the pipe body 100. In this way it is ensured that the outer sublayer 303 covers not only the gap 305 but also the entire inner sublayer 302. Thus, when any one of the heat tracing sections 304 of the inner sub-layer 302 can not be heated, the outer sub-layer 303 can compensate for the heating in time, thereby ensuring the working stability of the heat tracing pipeline 1.

In one embodiment, the outer sublayer 303 accompanies heat for the heating wire. This outer sub-layer 303 is formed in a similar manner as the inner sub-layer 302 with heating wires for heat tracing, and will not be described here.

In one embodiment, the outer sub-layer 303 includes a first section 310 corresponding to the gap 305 and a second section 311 corresponding to the heat trace section 304. The density of the turns of the heating wire of the first section 310 is greater than the density of the turns of the heating wire of the second section 311. In the present application, the density of turns refers to the number of turns per unit length. In a specific embodiment, the density of the turns of the heating wire of the first section 310 is twice the density of the turns of the heating wire of the second section 311. With this structure, the heating intensity of the first section 310 of the outer sublayer 303 is greater than that of the second section 311. Thus, the pipe section corresponding to the gap 305 and the pipe section corresponding to the heat trace section 304 are heated to the same degree in the pipe body 100, and the overall heating degree of the pipe body 100 is relatively uniform, thereby contributing to further improving the working stability of the heat trace pipe 1.

In one embodiment, the heating wires of the outer sublayer 303 comprise at least two wires in parallel. The heating wires can work independently, so that when one heating wire cannot work, the other heating wires are not influenced and compensation heating is realized. In addition, some heating wires can be set to work according to the environmental temperature condition, and some heating wires are set to be standby, so that the electric energy can be saved while the heating effect of the pipeline body 100 is ensured.

In one embodiment, a first insulation layer 320 is disposed between adjacent sub-layers 301 of the heat trace layer 300, and a second insulation layer 330 is disposed on a radially outer surface of the heat trace layer 300, wherein the thickness of the first insulation layer 320 is less than that of the second insulation layer 330. The thicker second insulation layer 330 helps to minimize the outward dissipation of heat from the heat trace layer 300 and the intrusion of external low temperature into the heat trace layer 300 and the pipe body 100; the thinner first insulating layer 320 facilitates heat transfer from the outer sublayer 303 of the heat tracing 300 radially inward to the pipe body 100. Thus, the thickness of the first insulation layer 320 being smaller than the thickness of the second insulation layer 330 helps to ensure that the temperature of the pipe body 100 is at a predetermined temperature.

In a specific embodiment, the thickness of the first insulating layer 320 is less than 2 cm; the thickness of the second insulating layer 330 is greater than or equal to 2 cm. For example, the first insulating layer 320 has a thickness of 1 to 2 cm, and the second insulating layer 330 has a thickness of 3 to 5 cm. The inventors have found that when the thickness of the first thermal insulation layer 320 is greater than or equal to 2 cm, the heat transfer of the outer sub-layer 303 is slow radially inward, which is not favorable for ensuring the temperature of the pipe body 100 to be at the predetermined temperature. When the thickness of the second insulating layer 330 is less than 2 cm, the heat of the outer sub-layer 303 is emitted to the external environment more seriously, and the electric energy loss is also more serious, which is not beneficial to energy conservation and environmental protection.

In one embodiment, first insulating layer 320 and second insulating layer 330 are made of asbestos.

In one embodiment, second insulation 330 is wrapped around and secured to duct body 100. Thus, the second insulation layer 330 can be closely attached to the heat trace section 304, thereby ensuring the insulation effect of the second insulation layer 330. In another embodiment, a plastic protective film layer is further disposed on the outer surface of the second insulation layer 330. In this case, the plastic protective film layer is also wrapped and fastened around the pipe body 100. In one particular embodiment, second insulation layer 330 may be wrapped using a material such as wire, plastic wire, or the like.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. The heat tracing pipeline is characterized by comprising a pipeline body and a heat tracing layer wrapped on the outer surface of the pipeline body,

wherein the heat tracing layer comprises a plurality of sub-layers, the plurality of sub-layers being stacked in a radially outward direction,

the plurality of sub-layers includes an inner sub-layer adjacent the pipe body and an outer sub-layer radially outward of the inner sub-layer,

the inner sub-layer comprises heat tracing sections which are intermittently distributed along the axial direction of the pipeline body, and the outer sub-layer at least covers gaps between the adjacent heat tracing sections of the inner sub-layer.

2. The heat trace pipeline according to claim 1, wherein the inner sub-layer is heating wire heat tracing or jacket heat tracing.

3. The heat trace pipeline according to claim 1, wherein the outer sub-layer is configured to extend entirely in an axial direction of the pipeline body.

4. The heat trace pipeline according to claim 2, wherein the outer sub-layer is heating wire heat trace.

5. The heat tracing conduit of claim 4, wherein the outer sublayer comprises a first section corresponding to the gap and a second section corresponding to the heat tracing section,

the number density of turns of the heating wire of the first section is greater than the number density of turns of the heating wire of the second section.

6. The heat tracing conduit of claim 4 or 5, wherein the heating wire of the outer sublayer comprises at least two wires connected in parallel.

7. The heat trace pipe according to claim 1, wherein a first insulation layer is disposed between adjacent sub-layers of the heat trace layer, a second insulation layer is disposed on a radially outer surface of the heat trace layer,

the thickness of the first heat-insulating layer is smaller than that of the second heat-insulating layer.

8. The heat tracing conduit of claim 7, wherein the thickness of the first thermal insulation layer is less than 2 centimeters; the thickness of the second heat-insulating layer is more than or equal to 2 cm.

9. The heat tracing pipe according to claim 7 or 8, wherein the second insulating layer is wrapped and fastened around the pipe body.