CN215763720U

CN215763720U - Heat preservation structure of power plant heat supply pipeline

Info

Publication number: CN215763720U
Application number: CN202121601073.8U
Authority: CN
Inventors: 刘凯伦
Original assignee: Deshengyuan Group Co ltd
Current assignee: Deshengyuan Group Co ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2022-02-08
Anticipated expiration: 2031-07-14

Abstract

The utility model discloses a heat insulation structure of a heat supply pipeline of a power plant, which comprises a working steel pipe, a polyurethane heat insulation layer and a polyethylene outer protection layer, wherein the working steel pipe is arranged at the innermost layer of the heat supply pipeline, the polyethylene outer protection layer is arranged at the outermost layer of the heat supply pipeline, the polyurethane heat insulation layer is wrapped outside the working steel pipe, and the polyethylene outer protection layer is wrapped outside the polyurethane heat insulation layer. Has the advantages that: the polyurethane spraying and winding prefabricated direct-buried heat insulation pipe is rough in surface of a heat insulation layer formed by spraying polyurethane, so that a molten polyethylene outer protective layer can be extruded and embedded into tiny depressions on the surface of the heat insulation layer, and the binding force between the heat insulation layer and the outer protective layer is increased; the thickness of the polyurethane heat-insulating layer and the thickness of the polyethylene outer protective layer of the prefabricated direct-buried heat-insulating pipe produced by the spraying winding process can be adjusted randomly according to the needs of users, the production process does not need to increase the investment of corresponding die tools, and the prefabricated direct-buried heat-insulating pipe is flexible, flexible and simple and easy to operate.

Description

Heat preservation structure of power plant heat supply pipeline

Technical Field

The utility model relates to the technical field of pipeline heat insulation, in particular to a heat insulation structure of a heat supply pipeline of a power plant.

Background

At present, the heat insulation construction of heat supply engineering all adopts an iron wire binding type heat insulation structure, namely, heat insulation materials are bound and fixed on a heat supply pipeline by iron wires and are externally coated with a protective layer. After the pipeline is put into operation for years, the pipeline shell is easy to drop due to the influences of long-term high temperature, iron wire corrosion and fracture, self gravity and the like, the lower side of the pipeline is not compact, a large open air gap is formed, the heat insulation performance of the pipeline is seriously influenced, and the heat dissipation loss of the pipeline is increased. The heat-insulating material is loose due to loose binding, and the service life is shortened.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heat insulation structure of a heat supply pipeline of a power plant, which aims to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a heat insulation construction of power plant's heat supply pipeline, includes work steel pipe, polyurethane heat preservation and polyethylene outer jacket, the work steel pipe sets up the inlayer at heat supply pipeline, the polyethylene outer jacket sets up the outmost at heat supply pipeline.

Furthermore, the polyurethane heat-insulating layer is wrapped outside the working steel pipe.

Furthermore, the polyurethane heat-insulating layer is wrapped by the polyethylene outer protective layer.

Further, the working steel pipe DN200 and above adopts spiral welding steel pipes, and the material is Q235B.

Compared with the prior art, the utility model has the following beneficial effects:

(1) the polyurethane spraying and winding prefabricated direct-buried heat-insulating pipe is characterized in that the surface of a heat-insulating layer formed by spraying polyurethane is rough, so that a molten polyethylene outer protective layer can be extruded and embedded into tiny depressions on the surface of the heat-insulating layer, the bonding force between the heat-insulating layer and the outer protective layer is increased, and three main materials of the pipe, namely a steel pipe, polyurethane and polyethylene, are ensured to form a firm and compact three-in-one structure;

(2) the thickness of the polyurethane thermal insulation layer and the thickness of the polyethylene outer protective layer of the prefabricated direct-buried thermal insulation pipe produced by the spraying winding process can be adjusted at will according to the needs of users, corresponding mold tooling investment is not required to be increased in the production process, the prefabricated direct-buried thermal insulation pipe is flexible and feasible, and the spraying winding process is simple and feasible, and the thickness of the polyethylene outer protective layer can be made relatively thin due to the fact that expansion stress is generated on the polyethylene outer protective layer when foaming does not exist in the spraying winding process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a heat insulation structure of a heat supply pipeline of a power plant according to an embodiment of the utility model.

Reference numerals:

1. working steel pipes; 2. a polyurethane heat-insulating layer; 3. a polyethylene outer jacket.

Detailed Description

The following, with reference to the drawings and the detailed description, further description of the present invention is made:

referring to fig. 1, the heat insulation structure of the heat supply pipeline in the power plant according to the embodiment of the present invention includes a working steel pipe 1, a polyurethane heat insulation layer 2, and an outer polyethylene protective layer 3, where the working steel pipe 1 is disposed at an innermost layer of the heat supply pipeline, and the outer polyethylene protective layer 3 is disposed at an outermost layer of the heat supply pipeline.

According to the scheme, the polyurethane heat-insulating layer 2 wraps the working steel pipe 1, the polyethylene outer protective layer 3 wraps the polyurethane heat-insulating layer 2, and spiral welding steel pipes are adopted at DN200 of the working steel pipe 1 and above, and are made of Q235B.

In specific applications, polyurethane spray: the working steel pipe 1 moves on a rotary tug with a certain angle at a constant speed, the polyurethane raw material is uniformly sprayed on the spirally advancing steel pipe in an umbrella shape, mist shape and uniform mixing state by a spray gun, the polyurethane raw material is initiated within a certain time to reach a certain compressive strength and thickness, and the thermal insulation layer is sprayed; winding polyethylene: the pipe that the spraying has polyurethane heat preservation 2 moves on the transmission line spiral, and the extruder extrudes the fused polyethylene sheet winding of certain thickness at the heat preservation extexine, along with the pipe last rotation with move ahead, the fused polyethylene sheet is extruded in succession to the extruder, twines on polyurethane layer surface according to the pitch stack of control, drenches the cooling back through the water, and polyethylene outer jacket 3 tightly wraps up polyurethane heat preservation 2 on work steel pipe 1, accomplishes the preparation of polyethylene outer jacket 3.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the utility model as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a heat preservation structure of power plant's heat supply pipeline, its characterized in that, includes work steel pipe (1), polyurethane heat preservation (2) and polyethylene outer jacket (3), work steel pipe (1) sets up the inlayer at heat supply pipeline, polyethylene outer jacket (3) set up the outmost at heat supply pipeline.

2. The insulation structure of the power plant heat supply pipeline according to claim 1, wherein the polyurethane insulation layer (2) is wrapped outside the working steel pipe (1).

3. A heat insulation structure of a power plant heat supply pipeline according to claim 1, characterized in that the polyurethane heat insulation layer (2) is wrapped with the polyethylene outer protective layer (3).

4. The heat preservation structure of the power plant heat supply pipeline according to claim 1, wherein spiral welded steel pipes are adopted in the number of DN200 and above of the working steel pipes (1), and the material is Q235B.