Pipeline pressure-stabilizing system and method used after liquefied petroleum gas out-conveying pipeline stops conveying

Abstract

The invention discloses a pipeline pressure-stabilizing system and method used after a liquefied petroleum gas out-conveying pipeline stops conveying. The pipeline pressure-stabilizing system comprises a temperature sensor, a pressure sensor, a first-stage pressure-stabilizing device and a second-stage pressure-stabilizing device. The temperature sensor and the pressure sensor are arranged on a main pipeline short section, and the first-stage pressure-stabilizing device and the second-stage pressure-stabilizing device are connected with the main pipeline short section. The first-stage pressure-stabilizing device comprises a first block valve, a stop valve and a pressure buffering tank which are sequentially connected with the main pipeline short section. A second block valve is arranged between the first-stage pressure-stabilizing device and the second-stage pressure-stabilizing device. The second-stage pressure-stabilizing device comprises a third block valve, a pressure buffer, a pressure regulating device and a liquefied petroleum gas storage tank which are sequentially connected with the main pipeline short section. The temperature detection result obtained when conveying is stopped is compared with the ground temperature, the pressure change in the pipeline after a certain period is calculated, and the first-stage pressure-stabilizing device is used for carrying out pressure supplementation on the pipeline according to the analysis result, or the first-stage pressure-stabilizing device and the second-stage pressure-stabilizing device are used for releasing the pressure of the pipeline to achieve pressure stabilization of the pipeline after conveying is stopped, the system safety is guaranteed, and pigging and emptying of the whole line are avoided.

Description

Technical field [0001] The invention relates to a pipeline stabilization system and method after a liquefied petroleum gas external transmission pipeline is stopped. Background technique [0002] In recent years, with the rapid development of petroleum exploration and petrochemical industry, the production and utilization of liquefied petroleum gas have been improved day by day due to its high octane number, good anti-knock performance, and high calorific value. The pipeline transportation of liquefied petroleum gas has been vigorously developed after a lot of economic demonstration and scientific research. Since the density of liquefied petroleum gas is lighter in liquid than water, and heavier in air than air, and has extremely strong volatility, once pipeline leakage occurs, liquid phase vaporization and gas accumulation will inevitably occur, which is very easy to cause major accidents. [0003] In the traditional liquid phase pipeline transportation, the extreme pressure is t...

AI Technical Summary

Problems solved by technology

Although the above-mentioned problems can be alleviated by starting pigging or downstream tank truck suction after the shutdown, it brings difficulties in the source of pigging power, difficulty in establishing a back pressure system when restarting production, and phase change of the medium in the pipeline after pressure loss. Problems and hidden dangers will also consume a lot of manpower and material resources

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