Cleaning method of nickel heat exchanger scale

Abstract

The invention belongs to the field of cleaning of industrial equipment, particularly relates to a water scale cleaning method for a nickel heat exchanger, and aims to provide an easy-to-operate method for cleaning the water scale of the nickel heat exchanger without disassembling. According to the technical scheme, the method comprises the following steps of sequentially performing alkaline cleaning and acid cleaning on the heat exchanger, and then performing rinsing and passivation treatment, wherein an acid cleaning solution is an aqueous solution containing the following components in percentage by mass: 5 to 10 percent of phosphoric acid, 5 to 10 percent of sulfamic acid, 0.1 to 0.3 percent of surfactant and 0.25 to 0.3 percent of acid cleaning corrosion inhibitor. According to the technical scheme, the circulating water scale of the nickel heat exchanger can be effectively cleaned, and meanwhile, inconvenience and manpower and material resource consumption caused by production stopping and disassembling are avoided; meanwhile, the technical scheme is simple, low in cost and suitable for popularization.

Description

technical field [0001] The invention belongs to the field of industrial equipment cleaning, and in particular relates to a cleaning method for nickel heat exchanger scale. technical background [0002] In the ionic membrane soda production process, the high-temperature lye cooling equipment usually uses industrial nickel plate heat exchangers. Due to the influence of the circulating water quality and the long-term operation of the process under high temperature conditions, the nickel heat exchangers are used for a period of time. Scale builds up on the water side. Due to the small thermal conductivity of dirt, which is generally only 1% of carbon steel, according to relevant statistics, when the dirt layer reaches 1mm, the heat transfer efficiency will be reduced by 8%, which will reduce the heat transfer efficiency and fail to meet the production process control parameters. , will be forced to stop production in severe cases. [0003] At present, the scale cleaning method...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of frequent manual cleaning, those skilled in the art need a method for chemically cleaning nickel heat exchangers

Because nickel is easily corroded by strong oxidizing inorganic acids, there are few chemical cleaning methods at present, and no related patents and reports have been seen so far.