A kind of LPG gas phase buried pipeline condensate draining device and its draining method

Abstract

The invention discloses an LPG gas-phase buried pipeline condensed liquid draining device and method. The LPG gas-phase buried pipeline condensed liquid draining device comprises a gas-phase pipeline,a liquid inlet pipe, a liquid collecting pipe, a liquid draining pipe, a ball valve, a bent pipe, a stop valve, a short pipe and pressure gages. One end of the gas-phase pipeline is fixedly connectedwith the liquid inlet pipe; the liquid collecting pipe is arranged below the liquid inlet pipe; an inlet end of the liquid collecting pipe is fixedly connected with an outlet end of the liquid inletpipe; the liquid draining pipe is fixedly connected with an outlet end of the liquid collecting pipe vertically; and the ball valve is fixedly mounted at one end of the liquid draining pipe. The LPG gas-phase buried pipeline condensed liquid draining device and method, disclosed by the invention, have the following two advantages that the LPG gas-phase buried pipeline condensed liquid draining device adopted in the LPG gas-phase buried pipeline condensed liquid draining method is simple in structure and convenient to mount and operate, and energy consumption is avoided; after the LPG gas-phaseburied pipeline condensed liquid draining method is implemented, no ground pipeline layout station yards are used, so that the LPG gas-phase buried pipeline condensed liquid draining device is attractive in appearance; and compared with a low bracket layout way and a truss laying way, the bracket manufacturing cost is reduced, and vehicle passing is facilitated.

Description

technical field [0001] The invention belongs to the technical field of liquefied petroleum gas storage and filling, in particular to an LPG gas-phase buried pipeline condensate draining device and a draining method thereof. Background technique [0002] The main components of liquefied petroleum gas are propane, butane, propylene, and butene. The saturated vapor pressure in winter is about 0.2MPa, and the dew point temperature at this time is 3-5°C. When the ground temperature of the pipeline is lower than 3°C, there will be Condensate (butane butene liquefied into dew) is precipitated. [0003] The condensate in the gas phase pipeline not only increases the resistance of the pipeline, but also damages the gas compressor. The timely discharge of the condensate is very important to ensure the safe operation of the LPG station. [0004] There are three forms of process pipeline laying in conventional LPG storage and filling projects. The first is laying on low supports on the...

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Problems solved by technology

[0010] (1) The LPG gas phase pipeline is laid on a low support on the ground, and the drain valve is installed at the low point of the pipeline. This method is simple and practical to install and maintain, but it will cause inconvenience to the LPG tanker when the pipeline is connected to the loading and unloading arm.

[0011] (2) The LPG gas phase pipeline is laid by truss, and the low point of the pipeline is equipped with a drain valve. In this way, the minimum height of the truss at the vehicle passage reaches 4.5 meters, and the inspection and maintenance of the pipeline is extremely inconvenient.

[0012] (3) The LPG gas phase pipeline is buried and laid, and the electric heating cable is used to increase the temperature of the medium in the northern region to avoid the precipitation of condensate; this method will increase the power consumption, and it is difficult to replace the heating cable when it is easily damaged

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