Scale removal method adapted for circulating and cooling water system

A circulating cooling water, amphoteric technology, used in descaling and water softening, chemical instruments and methods, oxidized water/sewage treatment, etc., to achieve the effect of low corrosion rate, easy removal of dirt, and improved descaling effect

Active Publication Date: 2005-06-29
BEIJING YANHUA PETRO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the corrosion inhibitor used is different from the general corrosion inhibitor used in the circulating cooling water system, and when octadecyl dimethyl benzyl ammonium chloride is used as the corrosion inhibitor, it will interact with anionic polyacrylate take effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Install the scaled test tube, add test water, and add a corrosion inhibitor to make sodium hexametaphosphate (in the form of PO 4 3- ), AA / AMPS / HPA terpolymer (weight ratio: AA / AMPS / HPA=68 / 17 / 15, limiting viscosity 0.085dl / g (30°C)), zinc sulfate (as Zn 2+ The effective concentration in circulating cooling water is 60mg / L, 80mg / L, 15mg / L. Start the dynamic simulation device, add glycolic acid to adjust the pH to 5-6, add 500 mg / L of hydrazine hydrate strong reducing agent (in the form of N 2 h 4 ) and 50mg / L dodecylaminoethylglycine, circulate for 1 hour, add 1500mg / L oxidant hydrogen peroxide, run for 24 hours, replace with tap water until the turbidity in the water is less than 10mg / L, after cleaning , remove the tube for drying, weighing, measuring volume, calculation and other post-processing.

[0025] The cleaning results are shown in Table 1:

[0026] Pipe dirt amount, g

Embodiment 2

[0028] Install the test tube that has made scale, add test water, add 50mg / L dodecylaminoethylglycine and 400mg / L hydrazine hydrate strong reducing agent (in the form of N 2 h 4 meter), start the dynamic simulation device, circulate for 1 hour, add corrosion inhibitor to make sodium hexametaphosphate (in PO 4 3- ), AA / HPA binary copolymer (weight ratio is AA / HPA=68 / 32, limiting viscosity 0.080dl / g (30°C)), zinc sulfate (as Zn 2+ The effective concentration in circulating cooling water is 80mg / L, 100mg / L, 20mg / L. Use sulfamic acid to adjust the pH to 4-5, add 1800mg / L peracetic acid oxidant, run for 24 hours, replace with tap water until the turbidity in the water is less than 10mg / L, after cleaning, remove the tube for drying, weighing and measuring Volume, calculation, etc. post-processing. The cleaning results are as follows:

[0029] Pipe dirt amount, g

Embodiment 3

[0031] Install the scaled test tube, add test water, and add the corrosion inhibitor sodium dihydrogen phosphate (in the form of PO 4 3-), AA / HPA binary copolymer (weight ratio is AA / HPA=68 / 32, limiting viscosity 0.080dl / g (30°C)), zinc sulfate (as Zn 2+ The effective concentration in circulating cooling water is 40mg / L, 80mg / L, 10mg / L. Start the dynamic simulation device, adjust pH 4-5 with sulfuric acid, add 60mg / L of dodecylaminoethylglycine and 400mg / L of hydrazine hydrate strong reducing agent (in the form of N 2 h 4 meter), circulate for 1 hour, add peracetic acid oxidant, the dosage is 2000mg / L, circulate for 30 hours, replace with tap water until the turbidity in the water is less than 10mg / L, after cleaning, remove the tube for drying, weighing, Post-processing such as volume measurement and calculation. The cleaning results are as follows:

[0032] Pipe dirt amount, g

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PUM

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Abstract

The invention relates to a descaling method suitable for cycling water cooling system, which includes: simultaneously or by steps add organic acid or sulphuric acid, corrosion inhibitor, surfactants and hydrazine hydrate of strong reductive agent into the cycling cooling water, then add 4 .The 5 reacts with 4, generating nitrogen, which can combine the chemical washing method and bobble method, increasing the descaling efficiency. Besides, the PH value is controlled by acid between 4-6, by which the quantity of acid can be reduced, so that decrease erosion to the equipment and pipeline of the system.

Description

technical field [0001] The invention relates to a descaling method suitable for a circulating cooling water system. Specifically, it relates to a method for removing microbial scale and soft scale (deposition scale generated by calcium salts in the presence of water treatment agents) on equipment and pipelines in a circulating water system. Background technique [0002] At present, most circulating water systems adopt alkaline water treatment process. When the system runs for a long period of time, due to scaling, corrosion and microbial accumulation, the cooling effect of the cooler will decrease, and cleaning is usually required. The conventional cleaning method has two steps. The first step is to add quaternary ammonium salt slime stripping agent to peel off. White sticky matter is often seen under the cooling tower. This is because the conventional polyacrylic acid scale inhibitor in the water treatment agent Dispersants react with quaternary ammonium slime strippers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F5/00C02F5/10
Inventor 闫岩郦和生王成杨校领常磊秦会敏任志峰
Owner BEIJING YANHUA PETRO CHEM
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