Pipeline cleaner ball receiving device with high gradient magnetic separator and powder separation method

Abstract

The invention provides a pipeline cleaner ball receiving device with a high gradient magnetic separator and a powder separation method; the ball receiving device is provided with a pipeline cleaner ball receiving barrel and the high gradient magnetic separator arranged on a gas pipeline in sequence, wherein the ball receiving barrel is connected with a main gas pipeline at the front end of a production valve; one end of a drainage pipe is connected with the ball receiving barrel, and the other end of the drainage pipe is connected with the rear end of the production valve; and at least one high gradient magnetic separator is arranged in the drainage pipe. In the invention, the sewage and large-particle diameter particles in the main gas pipeline can be cleaned through the ball receiving barrel, and simultaneously a high gradient magnetic field region is generated outside the high gradient magnetic separator; therefore, the paramagnetic particles with extremely weak magnetism even can be attracted by magnetic force and separated from carrying fluid, and the cleaning effect of the main gas pipeline is improved. The invention has high separation efficiency, convenience for maintenance and reliability for operation; moreover, the pipeline cleaner ball receiving device is suitable for powder separation while cleaning a natural gas pipeline with high flow speed and high pressure, and is capable of improving the natural gas quality and the purification effect.

Description

technical field [0001] The invention relates to the field of natural gas pipelines, in particular to a pig collecting device and a powder separation method with a high-gradient magnetic separator for separating black powder in natural gas pipelines. Background technique [0002] There are corrosive dust (powder), welding nodules, and iron filings and dirt caused by construction in the natural gas pipeline. Pigging the pipeline can sweep the corrosive particles such as iron sulfide into the ball collection tube to be removed. "Foreign Oilfield Engineering" No. 2, 2002, Liu Dan translated Richard Baldwin's paper "Characteristics and Treatment Methods of Black Powder in Natural Gas Pipelines" and proposed the concept of black powder (powder) (Black Powder). Powder is mainly particles produced by pipeline corrosion and elbow erosion, including iron sulfides and oxides, as well as broken iron wires and iron filings from steel brush pigs. [0003] Black powder is the collective n...

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Problems solved by technology

[0012] 1) The cyclone separator is used in natural gas pipelines with fast flow velocity and high pressure, and the separation effect on small particle size powder is poor. Because the separation mechanism of the cyclone separator is to use the centrifugal force of the particles under high-speed rotation, it is limited by it. The separation efficiency of 5μm dust particles is not high;

[0013] 2) The existing separation equipment for long-distance natural gas pipelines has a low separation efficiency for powder during pigging operations, which will cause damage to instruments and secondary pollution of natural gas;

[0014] 3) Due to the large fluctuation range of gas volume and high pressure in the gas pipeline, there is currently no complete and reliable performance calculation method and evaluation standard for high-pressure cyclone separators and filters in natural gas pipelines, which leads to a certain blindness in the selection of separation and filtration equipment. It will also affect the safety of valves, instruments, and compressor station accessories

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