CN-117847332-B - Antifreezing method for field conveying pipeline

Abstract

The invention discloses an antifreezing method for a field conveying pipeline, which is characterized in that a phase-change material is arranged on the conveying pipeline, solar energy which cannot be absorbed by the thin-film solar cell is converted into phase-change energy for storage by means of the phase-change material, and the phase-change energy is converted into heat energy at night to realize heat preservation and antifreezing. The invention can more efficiently utilize solar energy, improves the heat preservation effect of the conveying pipeline and better ensures the safety of pipeline conveying. Is particularly suitable for being transported and used in the field with larger day and night temperature difference.

Inventors

• GAO YAFENG
• DU SHIQI
• DONG SHIJIAN
• HU GANG

Assignees

• 重庆大学

Dates

Publication Date

20260505

Application Date

20240229

Claims (9)

1. 1. The outdoor conveying pipeline antifreezing method is characterized in that a phase-change material is arranged on the conveying pipeline, solar energy which cannot be absorbed by the thin-film solar cell is converted into phase-change energy for storage by means of the phase-change material, and the phase-change energy is converted into heat energy at night to realize heat preservation and antifreezing; the solar energy which cannot be absorbed by the outer thin film solar cell is absorbed and conducted to the phase change material inside by adopting the heat conduction liquid in daytime, and the heat conduction liquid outside is pumped out to form a cavity at night, so that heat preservation and freezing prevention are realized.
2. 2. The outdoor conveying pipeline antifreezing method according to claim 1, wherein the method is realized by means of a solar antifreezing conveying pipeline, the solar antifreezing conveying pipeline comprises a pipeline body, an electric heat tracing layer, a phase-change heat storage layer, a heat conduction liquid layer and a thin film solar cell are sequentially coated outside the pipeline body from inside to outside, an electric heat tracing band is arranged in the electric heat tracing layer, a solid-liquid phase-change material is arranged in the phase-change heat storage layer, heat conduction liquid is filled in the heat conduction liquid layer, the thin film solar cell is connected with a storage battery, and the storage battery is connected with a controller and the electric heat tracing band.
3. 3. The method for preventing freezing of a field transportation pipeline according to claim 2, wherein a temperature probe is arranged in the electric tracing layer, and the temperature probe is connected with a controller.
4. 4. The outdoor conveying pipeline antifreezing method according to claim 2, wherein a plurality of raised phase-change heat storage modules are arranged in the phase-change heat storage layer at intervals, and the solid-liquid phase-change material is packaged in each phase-change heat storage module; And in the phase-change heat storage layer, the interval cavity between each phase-change heat storage module is communicated with the heat conduction liquid layer.
5. 5. The outdoor transportation pipeline freezing prevention method according to claim 4, wherein a transparent housing is further arranged outside the thin film solar cell.
6. 6. The method for preventing freezing of outdoor transportation pipeline according to claim 5, further comprising a reflector plate with arc cross section layer below, wherein the reflector plate and the pipeline body are coaxially arranged, and the shell is suspended and supported above the reflector plate.
7. 7. The outdoor transportation pipeline freezing prevention method according to claim 6, wherein the inner side surface of the reflecting plate is provided with a self-cleaning nano reflecting material coating; The two sides of the reflecting plate can be connected with the extending plate in a pulling way, the connecting rod along the diameter direction is arranged at the outer end of the extending plate to realize the supporting connection of the shell, and a bolt hole for fixing the extending plate after the extending plate is pulled is arranged between the extending plate and the reflecting plate.
8. 8. The outdoor pipeline freezing prevention method according to claim 4, wherein a heat insulation layer is arranged between the outside of the phase change heat storage layer and the heat conduction liquid layer, openings which are communicated with the cavity in the phase change heat storage layer and the heat conduction liquid layer are respectively arranged at the upper end and the lower end of the heat insulation layer, micropumps are respectively arranged in the openings at the upper end and the lower end, and the micropumps are connected with the storage battery and the controller.
9. 9. The outdoor transportation pipeline freezing prevention method according to claim 8, wherein an air bag is further arranged at the inner top position of the phase change heat storage layer, the air bag is filled with protection gas, the air bag is communicated with the heat conducting liquid layer through an upward through hole, and a ventilation liquid-proof film is arranged in the through hole.

Description

Antifreezing method for field conveying pipeline Technical Field The invention relates to the technical field of conveying pipelines, in particular to an antifreezing method for a field conveying pipeline. Background In the exploitation and use process of energy media such as natural gas, petroleum and the like, a conveying pipeline is required to be adopted for medium transmission. In part of alpine regions, the solar direct irradiation can reach twenty-three DEG in the daytime and the cooling at night can reach below zero DEG in the daytime due to the characteristic of large temperature difference in the morning and evening. Thus, in the energy medium conveying process, how to realize heat preservation of the pipeline is needed to be considered so as to prevent the problem of freezing. The conventional pipeline heat preservation technology is a high-efficiency heat preservation structure of a conveying pipeline disclosed by CN202210704824.1, for example, the conveying pipeline is sequentially provided with an outer heat preservation pipe, a pipeline main body and an inner heat preservation pipe from outside to inside, the outer heat preservation pipe comprises a sheath layer and a heat insulation layer, the inner heat preservation pipe comprises a plurality of inner heat preservation units and pull rods, each inner heat preservation unit comprises a matrix, a guide pipe and an aerogel layer, the matrix comprises a connecting ring and a guide block, the inner peripheral wall of the guide pipe, the surface of the matrix and the outer peripheral wall of the guide pipe outside the matrix are respectively provided with an aerogel layer, and the plurality of inner heat preservation units are sequentially connected into a tube shape through the pull rods. The invention can enhance the heat insulation capacity of the pipeline and reduce the heat loss of materials. However, the heat preservation mode of the pipeline can only slow down the reduction of the temperature of the pipeline, and has limited heat preservation effect. CN201710299010.3 discloses an energy-saving heat preservation device of a chemical conveying pipeline, which comprises a conveying pipeline, wherein the outer surface of the conveying pipeline is wrapped with a hollow water jacket, a thin film solar cell is laid on the surface of the water jacket, a water inlet penetrating through the thin film solar cell and communicated with the inside of the water jacket is arranged at the top of the water jacket, a heating element is arranged in the water jacket, and the thin film solar cell is electrically connected with the heating element. The device of the invention does not consume fossil energy, is maintenance-free, and has safe and reliable work, energy conservation and environmental protection. However, the device only relies on the solar cell to convert and absorb solar energy, the solar energy conversion efficiency is low, and for some conveying pipelines with larger diameters (more than one meter), the heat preservation requirement of the pipelines is difficult to ensure only by the solar cell. Therefore, for those skilled in the art, a technology capable of better utilizing solar energy and improving the heat preservation effect of the pipeline is required to be designed, and the safety of pipeline transportation is better ensured. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide an outdoor pipeline anti-freezing method capable of more efficiently utilizing solar energy and improving the pipeline heat preservation effect and the pipeline transportation safety. In order to solve the technical problems, the invention adopts the following technical scheme: A method for preventing freezing of field conveying pipeline features that a thin-film solar cell is arranged on the external surface of conveying pipeline to convert the solar energy radiated to conveying pipeline in daytime into electric energy and the solar energy is converted into heat energy at night for heat-insulating and freezing prevention. Therefore, the method realizes heat preservation and freeze prevention by means of solar energy absorption and conversion by the solar cell and the phase change material and release at night, so that the solar energy can be more effectively utilized, and the freeze prevention effect on a conveying pipeline is improved. Further, solar energy which cannot be absorbed by the outer thin film solar cell is absorbed and conducted to the phase change material inside by adopting the heat conduction liquid in daytime, and the heat conduction liquid at night is pumped out to form a cavity, so that heat preservation and freezing prevention are realized. Therefore, solar energy which cannot be absorbed by the solar thin film battery can be better absorbed by the heat conduction liquid during daytime, and an interval space is formed after the heat conduction liquid is pumped away at night, so that heat preservation and