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Method of solving frost heaving of buried pipeline through forced ventilation

A technology of buried pipelines and forced ventilation, which is applied in pipeline heating/cooling, general water supply saving, pipes/pipe joints/fittings, etc. It can solve the problems of limited function, limited upstream and downstream pressure adjustment, and difficulty in grasping the time and degree of frost heave and other problems to achieve the effect of increasing the temperature and reducing the possibility

Inactive Publication Date: 2016-12-07
荣海伦
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  • Application Information

AI Technical Summary

Problems solved by technology

Heating with gas heating furnace or electric heating furnace can completely eliminate frost heave, but the heating method has the following disadvantages: Heating needs to consume a lot of natural gas or electricity, resulting in a lot of energy waste, which is inconsistent with the national policy of energy conservation and environmental protection; It is difficult to grasp the time and degree of frost heaving, and it is difficult to optimize the operation of the heating furnace
However, due to the limited regulation of upstream and downstream pressure, the effect of this scheme is limited

Method used

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  • Method of solving frost heaving of buried pipeline through forced ventilation

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Embodiment Construction

[0019] exist figure 1 In the process, a waterproof pipe ditch is built around the natural gas pipeline, the pipe is elevated, and then a fan is used to send air into one end of the pipe ditch through the air inlet and exhaust it at the other end.

[0020] The pipe trench can be built with waterproof cement or waterproof membrane to prevent groundwater or rainwater from entering the pipe trench.

[0021] The air inlet and exhaust outlet should prevent rainwater from entering, and the outlet can be downward or horizontal or equipped with a rainproof cap.

[0022] In order to prevent the air from flowing through the trench, the temperature drops too fast and the temperature at the outlet is too low, the air flow in the trench is adjusted according to the outlet temperature.

[0023] In order to prevent water accumulation in the pipe ditch, a water accumulation ditch should be set under the pipe ditch, and the water in the accumulation water ditch will flow into the water accumul...

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Abstract

The invention aims at solving a problem of soil frost heaving in the operation process of a low-temperature pipeline, and particularly relates to a method of solving frost heaving of a buried pipeline after a natural gas pipeline is throttled. The method comprises the following steps of building a waterproof cement pipe ditch on the periphery of the pipeline to hang the pipeline in the air, so that air on the periphery of the pipeline is isolated from circumferential soil, meanwhile, feeding air into the pipe ditch by using a draught fan, enabling the air to flow along the pipeline and discharging the air at the other end. The method has the beneficial effects that the temperature of a natural gas rises by causing air with the temperature higher than the temperature of the pipeline to exchange heat with the pipeline, and meanwhile, air continuously flowing enables the pipeline to be isolated from the circumferential soil, thereby increasing the temperature of the circumferential soil and reducing the possibility of frost heaving. The method solves the problem of frost heaving of the pipeline and is energy-saving and environmental-friendly.

Description

technical field [0001] The patent of the present invention relates to the problem of frost heave during the operation of low-temperature pipelines, in particular to the problem of frost heave of buried pipelines after throttling natural gas pipelines. Background technique [0002] When there is a large difference between the inflow pressure and the distribution pressure of the natural gas distribution station, due to the Joule-Thomson effect, the temperature of the distributed natural gas drops below the freezing point, causing the soil around the pipeline to freeze, and the phenomenon of "frost heave" occurs, and the valve body is separated. The valve seat, the ground, and the wall are cracked, the pipeline is deformed, and the local elbow stress is concentrated, which affects the safe operation of the distribution station. [0003] There are many measures to solve the problem of pipeline frost heave, but there are some shortcomings, as follows: [0004] 1. Heating method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L53/00
CPCF16L53/32Y02A20/20
Inventor 荣海伦
Owner 荣海伦
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