Cyclic acid pickling device and method of trough type pickling tank

Abstract

The purpose of the invention is to provide a cyclic acid pickling device of a trough type pickling tank and a cyclic acid pickling method of a trough type pickling tank. Rusts and other impurities adhering to the inner and outer surfaces of a pipeline can be efficiently removed through the device and the method provided by the invention; the production cost is reduced and the discharge of waste acids is reduced because the acid pickling solution is cyclically filtered and used repeatedly; and therefore, actual use effects of energy conservation and emission reduction are achieved. According to the invention, the processes of soaking acid pickling, side spray forced cyclic acid pickling, cyclic acid pickling by injecting an acid into a pipeline and acid pickling by spraying outside the pipeline are adopted to performing multi-directional acid pickling on the pipeline, and the acid pickling effect on the pipelines which are deep in rusting degree, large in pollutant adsorption quantity, and multiply bent are especially obvious; simultaneously, a method of cyclically filtering and recycling the acid pickling solution and complete covering with soft plastics is adopted, so that the purposes of energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of pipe pickling, and in particular relates to a pickling device and method capable of combining immersion pickling and internal and external circulation pickling for partially prefabricated pipes and special-shaped materials. Background technique [0002] The steel pipes used in pipeline systems for conveying media such as lubrication, hydraulic pressure, and oxygen need to be pickled before construction or after prefabrication before they can be put into the next stage of on-site installation. Because of the small investment and simple pickling process, the current pipeline pickling Tank pickling tanks are commonly used for pickling, but due to the poor fluidity of the tank pickling solution and the different shapes of the pipes to be cleaned, the pickling quality is poor, and the residual rust and dirt directly affect the quality of the medium. Cleanliness, serious and even cause system paralysis. Be...

AI Technical Summary

Problems solved by technology

[0002] The steel pipes used in pipeline systems for conveying media such as lubrication, hydraulic pressure, and oxygen need to be pickled before construction or after prefabrication before they can be put into the next stage of on-site installation. Because of the small investment and simple pickling process, the current pipeline pickling Tank pickling tanks are commonly used for pickling, but due to the poor fluidity of the tank pickling solution and the different shapes of the pipes to be cleaned, the pickling quality is poor, and the residual rust and dirt directly affect the quality of the medium. Cleanliness, serious and even cause system paralysis

Because the pickling of the finished pipes before construction is straight pipes, the difficulty of construction mainly lies in the poor fluidity of the acid solution and the difficulty of fully pickling inside the pipes; the impurities in the pickling pool enter the depth of the pipes, especially the bottom of the pickling pool. Dirt accumulation is difficult to deal with

The pipes prefabricated on site are welded with elbows, and the pipes are often bent. After being put into the pickling pool, some pipes are not immersed in the acid solution and cannot be pickled. Internal rust is more serious

Therefore, on-line pipeline pickling can only be used, and on-line pickling needs to make temporary pipelines, and the construction cost is high. At the same time, once the pipeline leaks, it will pollute the site environment, so it is generally not adopted by the construction unit.

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