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Prevention device and method for frost heaving of pipe foundation soil of buried cold transportation natural gas pipeline in discontinuous permafrost region

A technology for natural gas pipelines and permafrost regions, applied in pipeline protection, pipeline systems, pipeline laying and maintenance, etc., can solve problems such as elliptical deformation, frost heaving of pipeline foundation soil, pipeline stress, etc., achieve stable heat generation, control pipe Frost heaving of foundation soil and the effect of reducing energy consumption

Active Publication Date: 2022-01-28
NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, in discontinuous permafrost areas, tundra and non-frozen zones are distributed intermittently or frequently transition, and soils with different frost heave sensitivities are also distributed unevenly. The surrounding rock and soil in the area will freeze, and as time goes by, a thicker and thicker frozen circle will be formed around the pipeline, forming a strong frost heave, which will easily cause frost heave disease of the pipeline foundation soil, and the result may cause the pipeline to be stressed, bent or elliptical transformation

Method used

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  • Prevention device and method for frost heaving of pipe foundation soil of buried cold transportation natural gas pipeline in discontinuous permafrost region

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Experimental program
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Effect test

Embodiment 1

[0032] A non-continuous permafrost region buried cold transport natural gas pipeline foundation soil frost heave prevention device, such as figure 1 As shown, the device includes an insulation board 2 laid along the length direction of the pipeline 3 and a nano-heat rod 1 (full name is molecular vibration dark infrared nano-heat rod), and an electric device for supplying power to the nano-heat rod 1. Rod 1 actively inputs heat to the pipe foundation soil to increase the temperature of the soil, reduce the heat loss of the soil around the pipe caused by the operation of the cold natural gas pipeline, and prevent the formation of a frozen circle around the pipeline. Ensure that the pipe base soil is always in a positive temperature state to avoid the occurrence of frost heave. The insulation board 2 is arranged directly below the pipeline 3, and the distance from the bottom end of the pipeline 3 is 200 mm. The width of the insulation board 2 is greater than that of the pipeline 3...

Embodiment 2

[0037] In order to control the nano thermal rod 1 and reduce the damage of the pipeline 3, on the basis of Example 1, the frost heave prevention device for the foundation soil of the buried cold transport natural gas pipeline in the non-continuous permafrost region also includes a pipeline monitoring system, the The pipeline monitoring system includes an integrated control device 6 and N pipeline detection modules, and each pipeline detection module is in communication connection with the integrated control device 6 .

[0038] Preferably, N=3, and each of the pipelines 3 is provided with three pipeline detection modules, wherein a pipeline detection module is respectively provided at the starting point, the end point, and the middle of the pipeline 3 . Each of the pipeline detection modules includes one or more thermistor sensors 4 and one or more vibrating wire strain gauges 5 . In order to make up for the single temperature monitoring method and prevent pipeline deformation ...

Embodiment 3

[0040] In order to reduce energy consumption and further control the nano thermal rod 1, thereby protecting the pipeline 3, on the basis of embodiments 1 and 2, the electric device includes a storage battery 7 and a solar power generation panel 8, and the solar power generation board 8 and the storage battery 7, the battery 7 supplies power to the nano-heat rod 1, and the voltage generated by the solar panel can match the voltage required by the nano-heat rod 1, which solves the problem of long-term energy supply. Energy is scarce in cold regions, but solar clean energy is sufficient, which can further save energy.

[0041] The integrated control device 6 is connected to the storage battery 7 . When the temperature measured by the three thermistor sensors 4 of the 100mm soil layer below the bottom of the pipe exceeds the maximum threshold value simultaneously, the integrated control device 6 controls the storage battery 7 to cut off the power supply; when the temperature of th...

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Abstract

The invention discloses a prevention device and method for frost heaving of pipe foundation soil of a buried cold transportation natural gas pipeline in a discontinuous permafrost region.The device comprises a heat preservation plate, a nanometer hot rod and an electric power device, wherein the heat preservation plate and the nanometer hot rod are laid in the length direction of a pipeline, the electric power device supplies power to the nanometer hot rod, and the electric power device is electrically connected with the nanometer hot rod. The heat preservation plate is arranged under the pipeline, and the nanometer hot rod is laid under the heat preservation plate in a tightly attached mode. An active control thought is adopted, passive is changed into active, heat is input actively to be balanced with the cooling capacity of a cold transportation pipeline, and a heat source is artificially added to adjust the temperature. The composite measure mode of the heat preservation plate and the nanometer hot rod makes full use of the advantages of the respective measures and integrates the advantages together, and the effects are maximized through the synergistic effect of the insulation board and the nanometer hot rod, so that the frost heaving of the pipe foundation soil of the cold transportation natural gas pipeline can be slowed down, and most importantly, the frost heaving of the pipe foundation soil of the cold transportation natural gas pipeline can be controlled.

Description

technical field [0001] The invention relates to the technical field of prevention and control of frost heaving disasters of foundation soil of natural gas pipelines, in particular to a device and method for preventing frost heaving of foundation soil of buried cold transport natural gas pipelines in discontinuous permafrost regions. Background technique [0002] Permafrost zones, such as the Arctic continental shelf, northern North America, Siberia and other regions, are rich in natural gas resources, and the exploration and development of resources and the construction of export pipelines have received increasing attention. Frozen soil is extremely sensitive to temperature. If the pipeline transportation temperature is high, it will cause the pipe foundation soil to thaw; if the pipeline transportation temperature is low, it will cause the pipe foundation soil to frost heave. Lead to excessive deformation of the pipeline, bending damage. [0003] The occurrence of soil fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/06F16L1/11F16L53/38F16L59/02F17D5/00
CPCF16L1/06F16L1/11F16L53/38F16L59/028F16L59/029F17D5/005
Inventor 李欣泽吴青柏金会军李艳曹亚鹏施瑞何瑞霞吴刚
Owner NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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