Circulating pickling device for pipeline

Abstract

The invention relates to the field of pipeline pickling and provides a circulating pickling device for a pipeline, a gas pipe and an acid sending pipe are communicated with an inlet main pipe through an inlet switching valve, an acid return pipe and a recovery pipe are communicated with an outlet main pipe through an outlet switching valve, and the other end of the recovery pipe is communicated with a recovery tank; the recovery tank is communicated with outside through an exhaust pipe and communicated with an acid tank through an acid discharge pipe; and an adsorption layer constituted by plastic particles or a plastic block is arranged at the bottom part of the recovery tank, wherein a pipe orifice of the recovery pipe points to the adsorption layer axially, the pipe orifice of the exhaust pipe is positioned above the top surface of the adsorption layer, and the pipe orifice of the acid discharge pipe is positioned below the top surface of the adsorption layer. The adsorption layer is blown up by acid mist formed during the recovery process after pickling, and acid droplets in the acid mist are captured and gathered, finally fall down, are collected at the bottom part of the recovery tank and are further recovered through the recovery pipe, thereby realizing the purpose of carrying out recovery treatment on the acid mist, preventing pollution, being simple in structure and being low in using cost and manufacturing cost. The circulating pickling device is applicable to circulating cleaning of the pipelines.

Description

technical field [0001] The invention relates to the field of pipeline pickling, in particular to a pipeline circulation pickling device. Background technique [0002] Industrial pipelines need to be cleaned before use, and the current commonly used process is the online cycle pickling process. The pipeline circulation pickling device includes an acid tank and an acid pump. The acid tank is respectively connected to the inlet and outlet of the pipeline to be cleaned through the acid delivery pipe and the acid return pipe. The acid pump is arranged on the acid delivery pipe. During the cleaning process, the acid solution is continuously sent into the pipeline to be cleaned by the acid pump through the acid delivery pipe to remove impurities and stains such as rust on the inner wall of the pipeline. After cleaning the pipeline, the acid solution flows back to the acid tank through the acid return pipe for circulation. use. After the pickling is completed, air or nitrogen is s...

AI Technical Summary

Problems solved by technology

Since the acid mist is discharged with the help of gas ≥ 0.6MPa, it will be sprayed like spring water when it is discharged, and it is difficult to deal with it. At present, the acid mist is directly discharged, and the direct discharge has no direction. The consequences will be serious pollution of the atmosphere, surrounding soil, civil foundations and equipment; at the same time, the direct discharge of acid mist will seriously stimulate the respiratory tract of operators and those present, affecting health

[0006] 3. In the process of cyclic pickling, the flow rate of the acid solution is extremely large, and the impurity content is also large, so the ordinary filter cannot meet the filtration of the recovered acid solution. At present, the recovered acid solution is usually directly recycled to the acid tank

Therefore, usually a large amount of impurities and rust in the pipeline will be taken into the acid tank along with the acid solution after being washed out by the acid solution. With the operation of the acid pump, these impurities and rust will be sucked by the acid pump and sent to the pipeline. inside, causing secondary pollution in the tube, which in turn affects the next step of cleaning

[0007] Therefore, the current pipeline circulation pickling device is very polluting. In order to prevent pollution and avoid the impact on the health of operators, the cost of personnel, civil engineering, and equipment protection is extremely high; the secondary pollution caused by acid impurities increases the cost of pickling. Treatment procedures also increase the cost of cleaning, so the current pipeline pickling cycle is extremely costly

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