Slurry conveying pipeline system with pipeline protection function and slurry conveying method

Abstract

The invention proposes a slurry conveying pipeline system and a slurry conveying method with pipeline protection function, the pipeline system includes a thickening tank, an underflow pump, a pulp storage tank, a feeding pump and a lime milk adding unit, and the lime milk adding The unit includes a milk of lime mixing tank, a milk of lime metering pump, a first pipeline branch and a second pipeline branch, the milk of lime mixing tank is connected to the milk of lime metering pump through a pipeline, and the outlet of the milk of lime metering pump is connected to the The first pipeline branch and the second pipeline branch, the outlet of the first pipeline branch is connected to the connecting pipeline of the underflow pump, and the outlet of the second pipeline branch is connected to the feeding pump on the connecting pipe. The present invention adds milk of lime to the main pipeline of slurry transport by alternately switching two pipeline branches, avoiding the accumulation of a thicker fouling layer on the inner wall of the pipeline, realizing continuous production while ensuring the amount of milk of lime added, and improving production efficiency .

Description

technical field [0001] The invention relates to the technical field of pipeline transportation, and more particularly relates to a slurry transportation pipeline system and a slurry transportation method with a pipeline protection function. Background technique [0002] Pipeline transportation technology is a new mode of transportation, which is different from traditional transportation methods such as roads, railways, water transportation, and aviation. Less, low cost and other unique advantages, and can realize automatic control. Today's global pipeline transportation undertakes a large proportion of energy and material transportation, including crude oil, refined oil, natural gas, oilfield associated gas, coal slurry, concentrate, etc. It plays a very important role in national economic and social development. However, the slurry pipeline used to transport the slurry is usually made of low carbon steel, and the internal metal loss of the pipeline caused by corrosion and ...

AI Technical Summary

Problems solved by technology

However, the slurry pipeline used to transport the slurry is usually made of low carbon steel, and the internal metal loss of the pipeline caused by corrosion and wear plays a major role in the pipeline design, and the internal corrosion loss of the slurry pipeline is obviously different from that of For pipelines that simply transport fluid, the presence of solid particles in the slurry will accelerate the corrosion rate and also wear the pipe wall, so the corrosion allowance of the service life must be considered when selecting the pipe wall

Generally, the PH value of the iron concentrate slurry produced by the dressing plant is below 7, which is acidic. In order to reduce the corrosion rate of the slurry pipeline, the slurry transported by the pipeline is required to be alkaline. Usually, lime milk is added to the pipeline to improve the transportation. The pH value of the slurry, increasing the pH value to 10.5 can effectively reduce the corrosion rate, but adding lime milk to the slurry pipeline will form a scaling layer (calcium carbonate) on the inner wall of the pipeline, which will cause corrosion during long-term use. The thickness of the fouling layer will accumulate thicker and thicker, and eventually the effective inner diameter of the slurry delivery pipeline will become smaller, which will seriously affect the delivery capacity of the slurry to the pipeline, especially in the slurry supply unit with thinner pipelines. A commonly used method in existing technologies is to regularly disassemble the pipeline in the slurry supply unit to clean the scale layer. This cleaning method is not only complicated in process, but sometimes it is found that the scale layer on the inner wall of the pipeline does not affect the production capacity after disassembly. The thickness of the pipe makes this blind pipe disassembly and cleaning method seriously affect the production efficiency

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