Scale and corrosion inhibitor using recycled water as circulating cooling water in fired power plant, method and application thereof

Abstract

The invention relates to a scale and corrosion inhibitor using recycled water as circulating cooling water in a fired power plant, a method and an application thereof. The recycled water is civic recycled water which is used as the circulating cooling water in the fired power plant in the manner of moisturizing, wherein the scale and corrosion inhibitor contains two sets of components: the first set of component contains organic phosphonate, polycarboxylic polybasic copolymer, zinc salt and water which is used as the solvent, and the second set of component contains copper corrosion inhibitor. The two sets of components are separately packaged. The scale and corrosion inhibitor can efficiently prevent calcium carbonate, scatter calcium carbonate crystallite, change the state of the calcium carbonate crystallite and prevent the generation of ferric oxide and calcium phosphate scale. The invention has the function of preventing the scale and corrosion of the civic water which is rich in salt, ammonia nitrogen and COD, is high in basicity and hardness and has strong anti-corrosion property. The scale and corrosion inhibitor of the invention can meet the demand of inhibiting scale and corrosion by only using 10 to 50 mg / l, so the industrial water usage and cost are saved and the benefit is high.

Description

technical field [0001] The invention relates to the technical field of industrial water treatment, in particular to a scale and corrosion inhibition technology applied to urban reclaimed water as supplementary water of a circulating cooling water system, to prevent scaling and corrosion of pipelines and equipment, especially a reclaimed water It is used as a scale and corrosion inhibitor for circulating cooling water in a thermal power plant, as well as its method and application. The reclaimed water is urban reclaimed water, and the reclaimed water in the city becomes circulating cooling water of a thermal power plant in the form of replenishment, and the scale and corrosion inhibitor is an energy-saving and environment-friendly water treatment agent. The invention is beneficial to rational and effective use of urban reclaimed water. Background technique [0002] The scarcity of fresh water resources and water pollution pose a threat to social progress and economic develop...

AI Technical Summary

Problems solved by technology

Reusing reclaimed water obtained after normal treatment as supplementary water for circulating cooling water, in addition to considering the problems of scaling, corrosion and sterilization of conventional circulating cooling water treatment, there are still the following technical difficulties: First, reclaimed water Contains more organic matter, so the growth of bacteria and algae is more serious than fresh water as supplementary water; secondly, reclaimed water often contains higher inorganic soluble salts, suspended solids, ammonia nitrogen, oil, phosphorus, etc. When the circulating cooling water system is used, the reclaimed water is continuously evaporated and concentrated in the cooling tower. When a certain concentration ratio is reached, the harmful ions in the water will cause strong corrosion and scaling; After the neutral ions are concentrated and run in the circulating cooling water system, it is very easy to cause serious corrosion to the copper heat exchanger and carbon steel pipeline of the system. Conventional scale and corrosion inhibitors also have the characteristics of poor resistance to ammonia nitrogen and organic matter, and are not suitable for medium Water used as circulating cooling water replenishment water requires the residence time of the agent, which can easily lead to the decomposition of the agent and reduce the performance of scale and corrosion inhibition. Therefore, it is necessary to develop special scale and corrosion inhibitor products for specific reclaimed water quality.

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