Corrosion and scale inhibition control method of circulating cooling water system and corrosion and scale inhibitor

Abstract

The invention discloses a corrosion and scale inhibition control method of a circulating cooling water system and a corrosion and scale inhibitor, and the method comprises the following steps: addinga pH value stabilizing agent, performing adding and monitoring by adopting an automatic pH value adjusting device, and controlling the pH value of the system to be 7.8-9.0; adopting an automatic dosing system for adding the corrosion and scale inhibitor, and controlling corrosion and scaling of the system. The corrosion and scale inhibitor comprises the following components in percentage by weight: 10%-15% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5%-20% of a fluorescent polymer, 0.5%-5% of sodium molybdate, 0.5%-1% of benzotriazole and the balance of water. According to the technology,the pH value of the circulating cooling water can be well stabilized, organic active matter components in the corrosion and scale inhibitor cooperate with molybdate to form a low-molybdenum efficientlow-salt water corrosion and scale inhibitor formula, a polymer containing a fluorescent monomer is used, an online fluorescence detector is used for achieving automatic dosing, stable operation of asystem is guaranteed, and the requirement for the corrosion speed of system pipelines and equipment is met.

Description

Technical field [0001] The invention belongs to the technical field of industrial circulating water quality management, and relates to a method and a corrosion and scale inhibitor for controlling scaling and corrosion in a circulating cooling water system using low salt water as supplementary water. Background technique [0002] The circulating cooling water system provides refrigeration or cooling services for the production process system through the circulating evaporation of water. The circulating water evaporates through the water in the cooling tower, and the dissolved salts in it are continuously concentrated. In order to maintain the stable operation of the system to a certain extent, appropriate Drain sewage and add new water, otherwise scaling, corrosion and other problems will occur, causing losses to the company's production. [0003] In an environment where water resources are increasingly scarce, water-using enterprises have adopted a variety of water-saving me...

AI Technical Summary

Problems solved by technology

The reason why this kind of water quality is highly corrosive is that the alkalinity is low and the buffering property is small, so it is easy to dissolve into CO 2 However, it is weakly acidic. Once corrosion occurs, the rust layer will have a strong accelerated corrosion effect on the corrosion process of metals, especially carbon steel materials; the commonly used phosphonate-zinc salt corrosion inhibitor formula is a deposited film type corrosion inhibitor. Zinc salts, calcium ions, and phosphonates are reacted and deposited on the cathode area of ​​the metal surface in water to form a film. The content of calcium ions in low-salt water is less, and the deposited film formed is uneven or extremely difficult to form, and the corrosion effect is difficult to control.

[0005] At present, the commonly used treatment method is to control the scaling and corrosion of the circulating water system by using regulators and phosphorus compound formula, to adjust the water quality, to adjust the alkalinity and pH value by adding alkali, and to adjust the calcium ion content in water by adding calcium chloride. , or fresh water and low salt water are adjusted according to a certain ratio. This treatment method is very important for the regulation and control of water quality, the operation is cumbersome, and the impact resistance of the system is poor.

[0006] Patent No. ZL 200510132300.6 discloses a molybdenum-phosphorus composite corrosion and scale inhibitor and its preparation method. The content of molybdate is 1-20wt%, and the cost of use is too high. The organic phosphine raw materials HEDP and ATMP used are in the Easy to hydrolyze under high concentration ratio, which increases the difficulty of sterilization control

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