Descaling method for long-distance high-concentration iron ore slurry conveying pipeline

Abstract

The invention provides a descaling method for a long-distance high-concentration iron ore slurry conveying pipeline, and belongs to the field of metallurgical pipeline dredging. The descaling method comprises the steps that (1) the scaling status inside the pipeline is checked, and sampling is conducted for chemical laboratory analysis; (2) opening cutting inspection is conducted on the pipe section, 11.5 km away from a main pump station, of the pipeline, according to the scaling layer status, the total scaling amount is estimated, and the equivalent diameter of the pipeline is calculated; the main compositions of scale are analyzed, and the one-time descaling amount is determined; (3) a first pipe cleaner is selected for cleaning up the pipeline according to parameters obtained in the (1) step and the (2) step; a pipe cleaner sending device matched with the first pipe cleaner is used for sending the pipe cleaner into the pipeline, the pipe cleaner is sent from a pipeline inlet to a pipeline outlet and is received by a pipe cleaner receiving device, and meanwhile it is guaranteed that the pipe cleaner is not plugged in the pipeline inlet or the pipeline outlet; (4) more pipe cleaners are sequentially used for cleaning up the pipeline. The descaling method has the advantages that that production is not affected by the pipeline cleaning process, the pipeline is not damaged, the technology is safe and environmentally friendly, and operation is easy.

Description

technical field [0001] The invention belongs to the field of long-distance slurry pipeline cleaning, and the long-distance means that the pipeline length is 102km. Background technique [0002] The long-distance iron ore concentrate transportation pipeline of Taiyuan Iron and Steel Jianshan Iron Mine is the first application of long-distance pipeline transportation technology for solid materials in domestic metal mines. 11.5mm segmented gradient. During production and operation, the scale on the inner wall of the pipeline caused the absolute roughness of the inner wall of the pipeline and the pressure at the outlet of the main pump to increase. It has been unable to meet the normal production demand, and there is a danger of high-pressure leakage of the squib. [0003] At present, pickling descaling requires the system to be shut down for a long time, which takes a long time and affects production, and the scale layer is not cleaned thoroughly. Multiple picklings will caus...

AI Technical Summary

Problems solved by technology

During production and operation, the scale on the inner wall of the pipeline caused the absolute roughness of the inner wall of the pipeline and the pressure at the outlet of the main pump to increase. It has been unable to meet the normal production demand, and there is a danger of high-pressure leakage of the burst tube

[0003] At present, pickling descaling requires the system to be shut down for a long time, which takes a long time and affects production, and the scale layer is not cleaned thoroughly. Multiple picklings will cause great damage to the acid corrosion of the pipeline body, and it is difficult to discharge waste liquid and waste acid leakage. risk, does not meet environmental protection requirements, and cannot ensure that the outlet pressure of the main pump is stable and safe to operate in a lower range