Residual acid recovery device used for pipeline pickling

Abstract

The invention relates to the pipeline pickling field and provides a residual acid recovery device used for pipeline pickling. The residual acid recovery device comprises a recovery tank, a recovery pipe, an exhaust pipe and an acid waste pipe, wherein the recovery tank is a sealed cavity and is communicated with the outside through the recovery pipe, the exhaust pipe and the acid waste pipe, the bottom of the cavity of the recovery tank is provided with an adsorption layer, the adsorption layer is composed of plastic particles or plastic blocks; the outlet end of the recovery pipe points to the adsorption layer in the axial direction; the inlet end of the exhaust pipe is above the top surface of the adsorption layer; and the inlet end of the acid waste pipe is below the top surface of the adsorption layer. In the back stage of the recovery, acid mist enters through the recovery pipe and tends to rise, the plastic particles or plastic blocks tend to fall under the action of gravity and the two materials move along the opposite directions, thus the acid droplets in the acid mist are captured and collected, finally fall in the bottom of the recovery tank and are recovered through the acid waste pipe. Therefore, the aim of recovering and processing acid mist can be achieved; and the recovery device has the advantages of simple structure, low cost and high recovery efficiency. The recovery device in the invention is suitable for recovering acid liquor and acid mist after the pickling.

Description

technical field [0001] The invention relates to the field of pipeline pickling, in particular to a residual acid recovery device for pipeline pickling. Background technique [0002] Industrial pipelines need to be cleaned before use, and the current commonly used process is the online cycle pickling process. During the cleaning process, the acid solution is continuously sent into the pipeline to be cleaned through the acid storage and delivery device 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 storage and delivery device for recycling. [0003] After pickling, use air or nitrogen to blow out the residual acid liquid in the pipeline and recover it through the acid tank. However, at the end of recovery, the residual acid liquid in the pipeline and the purge gas mix to form acid mist. Since the acid mist is discharged with the help of gas ≥ 0.6MPa, it will be sprayed like ...

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

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