Process and device for recycling liquid phase ethane pipeline emptying liquid

Abstract

The present invention provides a process and device for recycling liquid phase ethane pipeline emptying liquid, and the device is composed of a valve, a heater, a compressor, a pump, a condenser, a gas holder, a pressure gauge, a thermometer, a flow meter, and a tanker; the heater can vaporize liquid phase ethane emptying liquid to safely and stably recycle the ethane emptying liquid; the condenser can liquefy ethane vaporized in the gas holder, and the pump can provide power for liquefied ethane emptying liquid to safely recycle the liquid phase ethane emptying liquid in an over-reach way; the compressor can provide power for vaporized ethane, to recycle the ethane emptying liquid from the tanker; the thermometer, the pressure gauge, and the flow meter can monitor temperature, pressure,and flow in a recycling process to further control the recycling progress. The present invention overcomes the problem that the conventional pipeline recycling process and device cannot recycle the liquid phase ethane pipeline emptying liquid which is prone to gas-liquid phase change and has high economic efficiency. Thus, the present invention has the following advantages of safe operation and high recycling economy.

Description

technical field [0001] The invention relates to a process and a device for recovering liquid-phase ethane pipeline vent liquid, and relates to the fields of liquid-phase ethane storage, transportation and pipeline transportation. Background technique [0002] Ethane exists in petroleum gas, natural gas, coke oven gas and petroleum cracking gas, and is obtained by separation. It is mainly used in industry to produce ethylene, ethylene oxide, vinyl chloride, ethyl chloride and nitroethane, etc. As an important chemical product, when the crude oil price rises to US$50 / barrel, the profit from ethane to ethylene will be very considerable. At present, pipelines play a very important role in the processing and transportation of liquid phase ethane at home and abroad. When pipelines are used to transport various liquids including liquid phase ethane, safety accidents such as pipeline leakage may occur due to factors such as pipeline itself and third-party damage. Once a safety acc...

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Problems solved by technology

[0005] Invention patent 201910634206.2 proposes a recovery process and device for venting air from gas-phase ethane pipelines. This patent mainly proposes a venting process and device for pipelines with gas-phase ethane as the transport medium, but recycling with a compressor alone cannot solve the problem of liquid-phase Related problems caused by gas-liquid phase transition in the recovery process of ethane;

[0006] Invention patent 201610033595.X proposes a measuring device and measurement method suitable for carbon dioxide pipeline venting and leak testing, but this patent mainly proposes a venting device for pipelines whose transport medium is gaseous carbon dioxide, and the physical properties of carbon dioxide and ethane are different Larger, so the venting device is obviously not suitable for liquid phase ethane pipeline recovery;

[0007] Invention patent 201910541890.X proposes a CNG natural gas compression recovery system, but this patent is mainly aimed at recovering the residual vaporized air after unloading tank trucks, except that it cannot solve the problems caused by the gas-liquid phase change of liquid phase ethane during the recovery process. In addition to the related problems, it cannot be used for the recovery of the vented liquid in the pipeline

[0008] To sum up, there are currently no processes and devices that can be used for reference for the recovery of liquid-phase ethane pipelines

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