Composite phosphorus-free corrosion and scale inhibitor applied to dry quenching waste heat boiler and preparation method

Abstract

The invention discloses a composite phosphorus-free corrosion and scale inhibitor applied to a dry quenching waste heat boiler and a preparation method of the composite phosphorus-free corrosion and scale inhibitor. The composite phosphorus-free corrosion and scale inhibitor comprises the following componens in parts by weight: 10-40 parts of hydroxypropyl trimethyl ammonium chloride chitosan, 20-50 parts of sodium gluconate, 10-25 parts of N-isopropylhydroxylamine, 10-30 parts of polyaspartic acid, 5-20 parts of glucoside, 5-20 parts of sodium hydroxide and 20-40 parts of ultrapure water. Thecomposite phosphorus-free corrosion and scale inhibitor is green and environment-friendly, effectively reduces the increase of boiler salt, avoids the influence of excessive use of the composite phosphorus-free corrosion and scale inhibitor on the boiler, enables conductivity rise in water after use to be less than 20 microseconds / cm, obviously reduces boiling frequency and decreases chemical cleaning frequency; and the composite phosphorus-free corrosion and scale inhibitor does not contain phosphorus, is green and environment-friendly, is easy to biodegrade after being discharged, does notgenerate secondary pollution, has efficient corrosion inhibition, scale inhibition, deoxygenation and degradability performances, and is suitable for the dry quenching waste heat boiler.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite non-phosphorous corrosion and scale inhibitor applied to dry quenching coke waste heat boilers and a preparation method thereof. Background technique [0002] CDQ waste heat boilers are generally sub-high pressure boilers or high pressure boilers, which are mainly equipment for recovering waste heat from coke CDQ to generate steam, and the water quality requirements of boilers are relatively high, and ultrapure water is required as supplementary water. To suppress the corrosion and scaling in the boiler operation, the compound corrosion and scale inhibitors based on phosphate are usually used. However, with the continuous operation of the equipment, there will inevitably be phosphate scale, which will accumulate over time. Corrosion can easily cause the boiler tube to burst, which will cause the combustible components in the circulating water to rise sharply, ...

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Problems solved by technology

[0002] CDQ waste heat boilers are generally sub-high pressure boilers or high pressure boilers, which are mainly equipment for recovering waste heat from coke CDQ to generate steam, and the water quality requirements of boilers are relatively high, and ultrapure water is required as supplementary water. To suppress the corrosion and scaling in the boiler operation, the compound corrosion and scale inhibitors based on phosphate are usually used. However, with the continuous operation of the equipment, there will inevitably be phosphate scale, which will accumulate over time. Corrosion can easily cause the boiler tube to burst, which will cause the combustible components in the circulating water to rise sharply, resulting in the explosion of the entire closed cycle gas, and serious safety accidents. In order to avoid accidents, the current method usually used is regular boiling Furnace chemical cleaning to protect the safe production of the boiler

[0003] Although the use of phosphate-based composite corrosion and scale inhibitors is economical and affordable, the disadvantages cannot be ignored. First, the use of a large amount of phosphate is prone to the phenomenon of phosphate hiding. The main reason is that part of the phosphate is precipitated and scaled. , burying hidden dangers for the boiler, secondly, regular boiler cooking will also cause loss of equipment and waste of chemicals, indirectly resulting in an increase in production costs, thirdly, the phosphorus-based corrosion and scale inhibitors currently used in the wastewater discharged have a high phosphorus content , easy to cause environmental pollution

Based on the above problems, it is not suitable to use phosphate-based composite corrosion and scale inhibitors for a long time.

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