Low-abrasion slurry pipeline conveying system and method

Abstract

The invention provides a low-abrasion slurry pipeline conveying system and method. The low-abrasion slurry pipeline conveying system comprises a lime milk preparation subsystem, a lime milk pumping and adding subsystem and a slurry conveying subsystem. Lime milk of a certain proportion is added into a slurry conveying pipeline, the PH value of slurry in the conveying process is adjusted, the slurry is made to be alkaline so that the rheological property of pulp slurry can be changed, abrasion to the pipeline is reduced due to the specific lubrication effect of the lime milk, a layer of passive film is generated on the inner wall of the pipeline due to existence of the lime milk, namely a calcium carbonate layer is formed, the scaling speed of the passive film and the speed of abrasion to the inner wall of the pipeline are basically the same in the slurry conveying process by controlling the addition amount of the lime milk, and therefore slurry only abrades the calcium carbonate passive layer formed by the lime milk when the slurry is conveyed in the pipeline, corrosion to the inner wall of the pipeline by the conveyed slurry is largely reduced, the overall service life of the pipeline conveying system is prolonged, the overall working efficiency of the pipeline conveying system is improved, and safe use of the pipeline is guaranteed.

Description

technical field [0001] The invention relates to the technical field of pipeline transportation of slurry materials, in particular to a long-distance slurry pipeline transportation system and method capable of effectively reducing wear on the inner wall of the pipeline. Background technique [0002] Most of the slurry conveying pipelines in the prior art are made of low-carbon steel, and the slurry material transported in the pipeline will corrode the inner wall of the pipeline, and the corrosion of the inner wall of the pipeline by this slurry is different from that of pure fluid on the conveying Corrosion of the inner wall of the pipeline, because the slurry transportation is to mix the solid material in the liquid to form a slurry and then use its flow characteristics to transport through the pipeline, so the slurry transported in the pipeline contains a high concentration of solid particles. The overall conveying process of the slurry will further accelerate the corrosion...

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Problems solved by technology

[0002] Most of the slurry conveying pipelines in the prior art are made of low-carbon steel, and the slurry material transported in the pipeline will corrode the inner wall of the pipeline, and the corrosion of the inner wall of the pipeline by this slurry is different from that of pure fluid on the conveying Corrosion of the inner wall of the pipeline, because the slurry transportation is to mix the solid material in the liquid to form a slurry and then use its flow characteristics to transport through the pipeline, so the slurry transported in the pipeline contains a high concentration of solid particles. The overall conveying process of the slurry will further accelerate the corrosion rate of the inner wall of the pipeline, and larger solid particles will directly wear the pipe wall. In addition, the existing slurry pipelines generally have a relatively long transportation distance, so that the slurry can be transported over a long distance During the long-term transportation process, the transportation pipeline will be seriously corroded, which will greatly reduce the service life and safety of the transportation pipeline, and increase the transportation cost and failure maintenance rate of the slurry pipeline transportation system

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