A corrosion inhibitor film applicator for gathering and transportation pipelines

Abstract

The invention discloses a pipeline corrosion inhibitor coating device, and especially relates to a corrosion inhibitor coating device for gathering and transportation pipelines for high sulphur content wet gas. The device is composed of two parts, namely a front rotating shaft and a rear rotating shaft, the front rotating shaft and the rear rotating shaft are connected through a shaft coupling; wherein the front rotating shaft is provided with a guiding disc, a sealing leather cup, a supporting disc, a turbine-worm mechanism, and a coating mechanism, and the rear rotating shaft is provided with a supporting wheel mechanism and a coating mechanism. During the pipeline operation process, under the friction action between the driving wheel and the pipe wall, the turbine-worm mechanism rotates and drives the front rotating shaft and the rear rotating shaft to rotate so as to drive the coating mechanism arranged in the rotating shafts to transport the corrosion inhibitor in the lower part of the pipeline to the top part of the pipeline, and thus the inner wall of the pipeline is evenly coated with a protective film layer of corrosion inhibitor. In an actual coating operation, the worm rotation speed can be adjusted according to the gas flow speed through adjusting the relative gear number of the worm and the turbine; the whole coating process does not need any other external force, thus automatic coating is achieved; and even under the layering condition of the corrosion inhibitor, coating quality can also be guaranteed.

Description

technical field [0001] The invention discloses a corrosion inhibitor film applicator for a gathering and transportation pipeline, in particular to a corrosion inhibitor film applicator for a gathering and transportation pipeline of high-sulfur moisture. Background technique [0002] In the natural gas industry, the function of the wet gas gathering and transportation pipeline is to transport the unseparated and purified natural gas in the gas gathering station to the gas treatment plant for further processing. Heat exchange occurs between the pipe and the external environment during the moisture transport process. When the heat conduction makes the temperature of the pipe wall lower than the water vapor dew point, a part of the heavy components will condense out, resulting in effusion. For sour gas pipelines containing hydrogen sulfide and carbon dioxide, under the condition of effusion, it will cause severe electrochemical corrosion of the pipeline, resulting in thinning or...

AI Technical Summary

Problems solved by technology

However, the device has the following problems during its use: First, because the gas behind the pig continuously enters the closed space formed by the two pigs, the distance between the two pigs before and after is getting larger and larger, and the height of the liquid enclosed between them is getting higher and higher. The lower and lower, the more difficult it is for the liquid to enter the nozzle, and it may even fail completely; the second is that the pig may rotate during operation, which will cause the spraying position of the nozzle to deviate from the top of the pipeline, resulting in poor reception at the top of the pipe wall. The third is that the amount of liquid injected is affected by various factors such as the gas flow rate behind the pipeline, the pipeline structure, etc., and cannot be kept constant, and the quality of the pre-film cannot be guaranteed.

This method uses a battery to drive the motor to rotate, and its running time is limited by the capacity of the battery, so it is difficult to apply to long-distance gathering and transportation pipelines

At the same time, due to the existence of electrical connections in the device, there are high requirements for explosion-proof performance, and there are potential safety hazards in the use of flammable and explosive gathering and transportation pipelines

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