Scale and corrosion inhibitor formula for high concentration multiple operation of recirculated cooling water system and method of use thereof

Abstract

The invention relates to a scale and corrosion inhibiter formulation used for the high concentration multiple operation of a circulating cooling water system, which comprises the raw materials with the following weight percent contents: 14.0-16.0 percent of 2-phosphonate butane-1, 2, 4-tricarboxylic acid, 7.0-9.0 percent of hydroxyl ethylidene diphosphonic acid, 11.0-13.0 percent of ZnSO4.7H2O, 1.0-2.0 percent of benzotriazole, 2.0-4.0 percent of calgon (NaPO3) 6, 1.0-3.0 H2SO4, 29.0-31.0 percent of acrylic acid / 2- acrylamide-2-methyl propane sulfonic acid polymer and water as the rest. The inhibiter has the advantages of solving the problems of corrosion and scale formation of the pipeline and equipment in the operating process of the circulating cooling water system of the electric power plant, improving the cyclic utilization rate of the circulating cooling water system, reducing the external water discharge and supplementary water, and avoiding the hazards of low-hardness and low-alkalinity water on the system under the condition of high concentration multiple operation.

Description

【Technical field】 [0001] The invention belongs to the technical field of water treatment, and relates to a scale and corrosion inhibitor formula for high concentration multiple operation of a circulating cooling water system and a use method thereof. 【Background technique】 [0002] The following hazards are likely to occur during the daily operation of the circulating cooling water system of thermal power plants: [0003] One is the precipitation and adhesion of sediments (mainly scale): bicarbonate is dissolved in natural water, and this salt is the main component of scale adhesion in cooling water. In the circulating cooling water system, the concentration of bicarbonate increases with the evaporation and concentration of the circulating cooling water. When the concentration reaches saturation, or when the water temperature rises through the heat transfer surface of the heat exchanger, the following will occur: reaction: [0004] Ca(HCO 3 ) 2 =CaCO 3 ↓+CO 2 ↑+H 2 o ...

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Problems solved by technology

CaCO 3 Deposited on the heat transfer surface of the heat exchanger, forming dense calcium carbonate scale, its thermal conductivity is very poor

[0006] Different scales have different thermal conductivity, but generally not more than 1.16w / (m 2 k), while the thermal conductivity of steel is 45w / (m 2 k), it can be seen that scale formation will inevitably affect the heat transfer efficiency of the heat exchanger

[0007] The harm of scale adhesion, the light one is to reduce the heat transfer efficiency of the heat exchanger, affect the output, increase the energy consumption, and in severe cases, the heat exchanger and pipeline will be blocked

[0008] The second is equipment corrosion: a large number of equipment in the circulating cooling water system are made of metal. Long-term use of circulating cooling water will cause corrosion, reduce the service life of the equipment or even perforate, causing safety hazards

[0011] (3) Dezincification corrosion of copper tubes: brass is the most commonly used copper material in condensers, and dezincification corrosion of brass is the most common form of corrosion, which includes uniform layered dezincification and local plug-like dezincification. But it is mainly local plug-like dezincification corrosion, which is easy to cause local perforation, so it is more harmful

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