WO2022237020A1

WO2022237020A1 - Linear fresnel photo-thermal power station molten salt pipe system and electric heat tracing installation method

Info

Publication number: WO2022237020A1
Application number: PCT/CN2021/117588
Authority: WO
Inventors: 贾元超; 陈卫东; 赵勇; 郑鹏; 逯军; 王现会
Original assignee: 中国电建集团山东电力建设第一工程有限公司
Priority date: 2021-05-08
Filing date: 2021-09-10
Publication date: 2022-11-17
Also published as: CN113431978B; CN113431978A

Abstract

A linear Fresnel photo-thermal power station molten salt pipe system and an electric heat tracing installation method. The linear Fresnel photo-thermal power station molten salt pipe system comprises molten salt pipes (2); adjacent molten salt pipes (2) are connected to each other by a valve body; a plurality of first electric heat tracing tapes (1) are fixed on the outsides of pipe bodies of the molten salt pipes (2); the extending direction of the first electric heat tracing tapes (1) is the same as the extending direction of the pipe bodies; the outside of the valve body is coated with a steel wire mesh (4); a second electric heat tracing tape (6) is bound on the outside of the steel wire mesh (4); the second electric heat tracing tape (6) is of a multi-section curved structure on the outside of the steel wire mesh (4).

Description

Linear Fresnel solar thermal power plant molten salt piping system and electric heat tracing installation method

technical field

The disclosure belongs to the technical field of solar power plant installation, and in particular relates to a linear Fresnel-type photothermal power plant molten salt pipeline system and an electric heat tracing installation method.

Background technique

Molten salt pipeline electric heating cable is a high temperature resistant stainless steel armored electric heating cable, which can heat the heated pipeline to about 280 degrees Celsius. When installing electric heat tracing for molten salt pipelines, heat-sensitive tapes, iron wires, etc. are usually used to stick and bind the pipelines and fix them.

technical problem

The inventor believes that the installation of electric heating cables for molten salt pipelines in the prior art mainly has the following disadvantages:

1) When installing electric heating cables for molten salt pipelines, heat-sensitive tapes are used to fix them, which are often not fixed firmly and are easy to loosen.

2) When fixing multiple electric heating cables for molten salt pipelines on a large pipeline, it is difficult to control the spacing between the heating cables, and the uneven spacing will cause local overheating.

3) After the electric heating cable is installed, without effective protective measures, the stainless steel electric heating cable is easy to be polluted and damaged.

4) The installation of the electric heating cable is affected by the support bracket, without reasonable construction measures, the construction is difficult and easy to be damaged.

Steel wire mesh is used to cover the outside of the valve body. The steel mesh is easy to fit the irregular surface shape of the valve body through deformation, and provides a basis for binding the steel wire mesh and the second electric heating cable with the binding rope. Compared with the direct use of iron wire, etc. Binding and using heat-sensitive tape, the binding of the second electric heating cable is more stable.

technical solution

The purpose of the present disclosure is to provide a linear Fresnel-type photothermal power plant molten salt piping system and an electric heat tracing installation method, which can at least solve one of the above technical problems.

In order to achieve the above purpose, the first aspect of the present disclosure provides a linear Fresnel-type solar thermal power plant molten salt pipeline system, including molten salt pipelines, adjacent molten salt pipelines are connected by valve bodies, and the pipe body of the molten salt pipeline A plurality of first electric heating cables are fixed on the outside. The extension direction of the first electric heating cables is the same as that of the pipe body. The outside of the valve body is covered with a steel wire mesh, and the outside of the steel mesh is bound with a second electric heating cable. The second electric heating cable has a multi-segment curved structure on the outside of the steel wire mesh.

As a further improvement, an annular fixing belt is bound on the outside of the pipe body at a set interval, the fixing belt includes a belt body, and a plurality of clamps are uniformly arranged on the outside of the belt body, and each clamp can be connected with the The electric heating cable is clamped, and the fixing of the electric heating cable and the fixing belt is realized.

Further, the clip includes a U-shaped snap ring and a snap tongue, the U-shaped snap ring and the snap tongue are respectively fixedly connected with the belt body, the U-shaped snap ring and the snap tongue form a horseshoe-shaped structure, and the U-shaped snap ring and the snap tongue can Bending deformation and stuck the first heating cable.

Further, the middle part of the molten salt pipeline is supported by a support bracket, the support bracket includes a support ring, the support ring can be set around the outside of the molten salt pipeline, the inner wall of the support ring is provided with a notch, and the notch can accommodate the first electric current. With heat.

Further, in the undeformed condition, both ends of the U-shaped clasp are fixed to the belt body, one end of the tongue is fixed to the belt body, and the other end extends into the U-shaped clasp to form a horseshoe-shaped structure.

The second aspect of the present disclosure provides a linear Fresnel-type photothermal power plant molten salt pipeline electric heat tracing installation method, including the following steps:

Install a fixing belt on the outer ring of the molten salt pipeline, and use the fixing belt to realize the fixing of the first electric heating cable outside the molten salt pipeline;

A steel wire mesh is set around the valve, and the second electric heating cable is bound by a binding rope outside the steel mesh, and the second electric heating cable is distributed in a curved multi-section outside the steel mesh.

A stainless steel foil is wrapped on the outside of the first electric heating cable and the second electric heating cable, and then thermal insulation cotton is wrapped on the outside of the stainless steel foil.

Beneficial effect

1) The fixed belt is used to cooperate with the fixture, which solves the problem that the installation and fixing of the electric heating cable in the molten salt pipeline is not firm and the spacing is not easy to control.

2) The electric heating cable of the molten salt pipeline is a kind of stainless steel armored electric heating cable, so the electric heating cable is easily polluted and damaged by the external environment after installation. This plan uses ultra-thin stainless steel foil for the installed electric heating cable Coating effectively reduces the pollution and damage of stainless steel electric heating cables.

3) The pipe support bracket often conflicts with the pipe electric heat tracing installation. This scheme adopts the method of reserving notches for the pipe support bracket to ensure that the electric heat tracing can be continuously constructed after the pipe installation is completed.

The fixed belt is used to bind the outside of the pipe body, and the fixed belt is used as the basis for fixing the first electric heating cable. The clamp on the fixed belt can be used to realize the position fixation between the first heating cable and the fixed belt. Compared with the use of steel wire rope In terms of the binding method, the binding method is simpler and more convenient, and can be directly connected with the clamp. Effectively prevent the loosening of the electric heating cable

The U-shaped snap ring and the tab of the horseshoe structure are used as the fixture, and the fixture can clamp the electric heating cable through bending deformation; the bending of the U-shaped snap ring can preliminarily clamp the first electric heating cable, and the use of the tab The way of passing through and bending the U-shaped snap ring makes the bending state of the U-shaped snap ring more stable, and forms a closed-loop bending space between the U-shaped snap ring and the tab, which can Effectively tighten the first electric heating cable.

Description of drawings

Fig. 1 is a schematic diagram of a plurality of electric heating cables attached to the outer surface of a molten salt pipeline in Example 1 of the present disclosure;

Fig. 2 is a schematic diagram of the cooperation between the electric heating cable at the valve and the steel wire mesh in Embodiment 1 of the present disclosure;

Fig. 3 is a schematic structural diagram of the support bracket in Embodiment 1 of the present disclosure. In the figure, 1. The first electric heating cable; 2. The molten salt pipeline; 3. The fixing belt; 4. The steel wire mesh; 5. The support bracket; 6. The second electric heating cable; 101. The first end; 102. 31, belt body; 32, tab; 33, U-shaped snap ring; 501, notch; 502, base.

Embodiments of the present invention

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

实施例Example 11

As shown in Figures 1-3, this embodiment provides a linear Fresnel-type solar thermal power plant molten salt pipeline system, including molten salt pipelines 2, adjacent molten salt pipelines 2 are connected by valve bodies, molten salt pipelines 2. A plurality of first electric heating cables 1 are fixed outside the pipe body. The extension direction of the first electric heating cables 1 is the same as that of the pipe body. The outside of the valve body is covered with a steel wire mesh 4. The second electric heating cable 6 is bound, and the second electric heating cable 6 has a multi-segment curved structure on the outside of the steel wire mesh 4 .

Specifically, an annular fixing band 3 is tied at intervals of set intervals on the outside of the pipe body, and the fixing band 3 includes a belt body 31, and a plurality of clamps are uniformly arranged on the outside of the belt body 31, and each clamp is It can be clamped with the electric heating cable, and realize the fixing of the electric heating cable and the fixing belt 3 .

Specifically, the clip includes a U-shaped snap ring 33 and a snap tongue 32, the U-shaped snap ring 33 and the snap tongue 32 are respectively fixedly connected with the belt body 31, and the U-shaped snap ring 33 and the snap tongue 32 form a horseshoe-shaped structure. The U-shaped snap ring 33 and the tongue 32 can be bent and deformed to hold the electric heating cable.

Specifically, the middle part of the molten salt pipeline 2 is supported by a support bracket 5, the support bracket 5 includes a support ring and a base 502, the support ring can be set around the outside of the molten salt pipeline 2, and the inner wall of the support ring is provided with a notch 501 , the notch 501 can accommodate the first electric heating cable 1 .

Specifically, the notches 501 run through both ends of the support ring along the extending direction of the molten salt pipe, and the number and position of the notches 501 are adapted to the number and position of the first electric heating cables 1 outside the molten salt pipeline 2 .

Specifically, the molten salt pipeline 2 and the valve body are covered with stainless steel foil, and the first electric heating cable 1 and the second electric heating cable 6 are covered inside the stainless steel foil. Specifically, the exterior of the stainless steel foil is covered with thermal insulation cotton. Specifically, under the condition of no deformation, both ends of the U-shaped snap ring 33 are fixed to the belt body 31, one end of the tab 32 is fixed to the belt body 31, and the other end extends into the U-shaped snap ring 33 to form a Horseshoe structure.

The beneficial effects of this embodiment are:

1. Horseshoe-shaped clamps with uniform spacing can be used to effectively fix each first electric heating cable, ensuring the installation distance of the first electric heating cable and preventing local overheating caused by the displacement of the first electric heating cable.

2. In view of the problem that the electric heat tracing on the valve body is not easy to fix, stainless steel wire mesh is used to cover the valve, and the electric heating cable is fixed on the steel wire mesh 4, which effectively ensures the firmness of the electric heating cable. It is not easy to shift, which ensures the heat tracing effect of the valve.

3. After the electric heating cable is installed, stainless steel foil is used to wrap the pipe as a whole, which effectively prevents the pollution and damage of the electric heating cable, and prevents the intergranular corrosion of the stainless steel electric heating cable and other metals.

4. The pipe support bracket adopts a special perforated insulation bracket for molten salt pipelines, which effectively avoids the problem of difficult installation of ordinary bracket electric heat tracing, eliminates the influence of pipe brackets on electric heat tracing construction, and can ensure that the electric heating after the pipeline installation is completed Heat tracing can be used continuously.

实施例Example 22

This embodiment provides a linear Fresnel-type photothermal power plant molten salt pipeline electric heat tracing installation method, including the following steps:

Install a fixing belt 3 on the outer ring of the molten salt pipeline 2, and use the fixing belt 3 to realize the fixing of the first electric heating cable 1 on the outside of the molten salt pipeline 2;

A steel wire mesh 4 is placed around the valve, and the second electric heating cable 6 is bound outside the steel mesh 4 by a binding rope.

The outer surface of the first electric heating cable 1 and the second electric heating cable 6 is wrapped with stainless steel foil, and then the outer surface of the stainless steel foil is covered with thermal insulation cotton.

Although the specific implementation of the present disclosure has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present disclosure. Those skilled in the art should understand that on the basis of the technical solutions of the present disclosure, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present disclosure.

Claims

A linear Fresnel-type molten salt pipeline system for photothermal power plants, characterized in that it includes molten salt pipelines, adjacent molten salt pipelines are connected by valve bodies, and a plurality of first electric tubes are fixed outside the molten salt pipelines. The extension direction of the first electric heating cable is the same as that of the pipe body. The outside of the valve body is covered with a steel mesh, and the outside of the steel mesh is bound with a second electric heating cable. The second electric heating cable is attached to the steel mesh. The exterior is a multi-segment curved structure.
The linear Fresnel-type solar-thermal power plant molten salt pipeline system according to claim 1, characterized in that, an annular fixing belt is bound on the outside of the pipe body at every set interval, and the fixing belt includes a belt body, A plurality of clamps are evenly distributed outside the belt body, and each clamp can be clamped with the electric heating cable, and realizes the fixing of the electric heating cable and the fixing belt.
The linear Fresnel-type solar-thermal power plant molten salt pipeline system according to claim 2, characterized in that, the fixture includes a U-shaped snap ring and a snap tongue, and the U-shaped snap ring and the snap tongue are respectively fixedly connected to the belt body , The U-shaped snap ring and the tab form a horseshoe-shaped structure, and the U-shaped snap ring and the tab can be bent and deformed to hold the electric heating cable.
The linear Fresnel-type solar-thermal power plant molten salt pipeline system according to claim 1, wherein the middle part of the molten salt pipeline is supported by a support bracket, the support bracket includes a support ring, and the support ring can be arranged in a ring Outside the molten salt pipeline, the inner wall of the support ring is provided with notches, which can accommodate the first electric heating cable.
According to claim 1, the linear Fresnel-type solar-thermal power plant molten salt pipeline system is characterized in that the notch runs through the two ends of the support ring along the extension direction of the molten salt tube, and the number and position of the notch are adapted to the molten salt. Number and location of the first electrical heating cables outside the salt pipeline.
According to claim 1, the linear Fresnel-type solar-thermal power plant molten salt pipeline system is characterized in that, the outer coating of the molten salt pipeline and the valve body is provided with stainless steel foil, and the first electric heating cable and the second electric heating cable The heating cable wrap is set on the inside of the stainless steel foil.
According to claim 6, the molten salt pipeline system of linear Fresnel-type photothermal power station is characterized in that, the outer covering of the stainless steel foil is provided with thermal insulation cotton.
According to claim 3, the linear Fresnel-type solar-thermal power plant molten salt pipeline system is characterized in that, under the condition of no deformation, both ends of the U-shaped snap ring are fixed to the belt body, and one end of the tab is connected to the belt body. The belt body is fixed, and the other end extends into the U-shaped snap ring to form a horseshoe-shaped structure.
A linear Fresnel-type photothermal power plant molten salt pipeline electric heat tracing installation method, characterized in that it includes the following steps:

Install a fixing belt on the outer ring of the molten salt pipeline, and use the fixing belt to realize the fixing of the first electric heating cable outside the molten salt pipeline;

A steel wire mesh is set around the valve, and the second electric heating cable is bound by a binding rope outside the steel mesh, and the second electric heating cable is distributed in a curved multi-section outside the steel mesh.
According to claim 9, the linear Fresnel-type photothermal power plant molten salt pipeline electric heating installation method is characterized in that a stainless steel foil is provided on the outside of the first electric heating cable and the second electric heating cable, and then The outer cladding of stainless steel foil provides insulation wool.