Optimization method of heat exchanger pickling process

Abstract

The invention belongs to the technical field of heat exchanger cleaning, and particularly relates to an optimization method of a heat exchanger pickling process. Firstly, according to scale layer components of a heat exchanger, comprehensive screening is conducted through a superposition graph of data statistical analysis software, and proper cleaning acid is found; under the effective concentration of the corrosion inhibitor, the screened standard test pieces with the cleaning acid and the heat exchanger shell made of the same material are used for carrying out a corrosion experiment, two sets of comparison data are obtained, the corrosion weight loss of the standard test pieces in acid with different concentrations is measured without adding the corrosion inhibitor in one set, and the weight loss of the standard test pieces is measured after the corrosion inhibitor is added in the other set; establishing a predicted value-actual value model of the corrosion weight reduction of the test piece, and finding out the optimal cleaning acid concentration by using a prediction descriptor of data software, and in the pickling process, the corrosion amount of the heat exchanger shell is minimum, and optimization of the heat exchanger pickling process is achieved. By the method, the problem of serious corrosion of the shell during pickling of the heat exchanger can be solved, and heat exchange efficiency of the heat exchanger is improved after pickling.

Description

technical field [0001] The invention belongs to the technical field of heat exchanger cleaning, and in particular relates to an optimization method for a heat exchanger pickling process. Background technique [0002] The tube-and-tube heat exchanger used in the three-waste treatment device of a chemical company has a carbon steel shell, 316 stainless steel tubes and tube sheets, the cooled medium goes through the tube side, and the cooling medium uses circulating water to go through the shell side. With the increase of the use time, scaling occurs on the outer wall of the heat exchange tube in the shell side, resulting in poor cooling effect of the heat exchanger and an increase in the amount of cooling circulating water, but the cooling effect is not good. After analysis, the dirt layer is rust, silt, carbonate, oil dirt, etc. It is difficult to remove these dirt with ordinary cleaning methods, and it is necessary to use pickling to remove dirt better. Although a suitable ...

AI Technical Summary

Problems solved by technology

Although the appropriate corrosion inhibitor can be selected in the pickling process to reduce the corrosion of the carbon steel shell during the pickling process, the improper proportion of the corrosion inhibitor and cleaning acid will still cause corrosion of the carbon steel shell in the actual process.

The heat exchanger is a key equipment in production. Once it is damaged, it will cause production delays. Due to the large volume and weight of the equipment, it will take a long time to repair or update it.

If the repair cost of damage is as high as hundreds of thousands of yuan, it will also cause the entire equipment to be scrapped.

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