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Low-phosphorus environment-friendly corrosion and scale inhibitor applied to low-temperature circulating water system and preparation method thereof

A technology of circulating water system and corrosion and scale inhibitor, which is applied in chemical instruments and methods, natural water treatment, scale removal and water softening, etc., can solve problems such as affecting the normal operation of equipment, being unsatisfactory, and failing to meet production needs. To achieve the effect of long effective use period, stable agent and low phosphorus content

Active Publication Date: 2021-06-04
鞍钢栗田(鞍山)水处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Phosphorus-based water treatment chemicals are commonly used in industrial circulating water. There are relatively few water treatment chemicals suitable for low-temperature circulating cooling water systems. At present, most of them are still using phosphorus-based water treatment chemicals. It is relatively high, and the heat exchange equipment and refrigeration equipment are in good condition in the initial stage of operation, but with the increase of the concentration ratio in the water, the salt content in the water is close to saturation, and a large amount of phosphate begins to precipitate, and due to the co-precipitation, the carbonate is also precipitated, and finally forms The scale mainly composed of calcium phosphate and calcium carbonate seriously affects the normal operation of the equipment, so the use of phosphorus-based water treatment agents with too high total phosphorus is not ideal in inhibiting scaling and cannot meet production needs

Method used

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  • Low-phosphorus environment-friendly corrosion and scale inhibitor applied to low-temperature circulating water system and preparation method thereof
  • Low-phosphorus environment-friendly corrosion and scale inhibitor applied to low-temperature circulating water system and preparation method thereof
  • Low-phosphorus environment-friendly corrosion and scale inhibitor applied to low-temperature circulating water system and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The composite agent of the present invention configured according to the above method was subjected to scale inhibition performance experiment, referring to the static scale inhibition evaluation test method in Sinopec's "Cooling Water Analysis and Test Method", and the temperature in the refrigeration constant temperature water bath was controlled at 10 ± 1 °C for carbonic acid Calcium deposition experiment, calcium phosphate deposition experiment, zinc salt deposition experiment, the experiment time is 10 hours. Ca before and after detection after the experiment 2+ 、PO 4 3- , Zn 2+ Mass concentration, calculate the corresponding scale inhibition rate, the experimental results are shown in Table 1.

[0065] Table 1: Static scale inhibition test results

[0066]

[0067]

[0068] It can be seen from Table 1 that all the compound formulations of each group have good scale inhibition effects, among which formula 1 has the best scale inhibition rate of 98.85% for...

Embodiment 2

[0070] The circulating water volume of the low temperature circulating cooling water system in an oxygen plant is 15000m 3 / h, the total water retention is 9000m 3 , The material of the equipment is mainly carbon steel, the water supply temperature of the refrigerating unit is 8-10 ℃, and the quality of the low-temperature circulating cooling water is shown in Table 2.

[0071] Table 2:

[0072]

[0073] Dosing each group of formulas at 30mg / L, when the total phosphorus in the circulating water is maintained at 1.0mg / L-1.5mg / L for 3 consecutive days, reduce the dosing concentration to 20mg / L, and carry out on-site industrial treatment for 1 month respectively The results of the simulation experiment, the temperature at the inlet and outlet of the refrigeration unit and the corrosion rate of the carbon steel coupon are shown in Table 3.

[0074] table 3:

[0075]

[0076] Note: The refrigeration efficiency is calculated according to the following formula:

[0077] ρ...

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Abstract

The invention provides a low-phosphorus environment-friendly corrosion and scale inhibitor applied to a low-temperature circulating water system. : 13-31 parts, sodium tetraborate decahydrate: 5-20 parts, polymethacrylic acid: 7-25 parts, zinc chloride: 1-18 parts, deionized water: 29-60 parts. Compared with the prior art, the invention has the beneficial effects of being a corrosion and scale inhibitor suitable for low-temperature circulating cooling water systems and excellent in inhibiting low-temperature scale. The composite agent of the present invention has a better inhibitory effect on the deposition of calcium carbonate, calcium phosphonate and zinc salts as the dosage increases under low temperature conditions. The composite agent of the invention has low phosphorus content and meets national environmental protection requirements. Each component of the compound agent of the invention has a synergistic effect, and at the same time, the medicament prepared by the method of the invention is more stable and has a longer effective use period.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a low-phosphorus, environment-friendly corrosion and scale inhibitor applied to a low-temperature circulating water system and a preparation method. Background technique [0002] The water supply temperature of cooling equipment in industrial low-temperature circulating cooling water system is generally ≤10°C, which is mainly used for cooling equipment such as special heat exchangers, condensers, and air cooling towers. For this kind of low-temperature circulating cooling water system, phosphorus-based composite corrosion and scale inhibitors are mainly used at present. [0003] Phosphorus-based water treatment chemicals are commonly used in industrial circulating water. There are relatively few water treatment chemicals suitable for low-temperature circulating cooling water systems. At present, most of them are still using phosphorus-based water treatment chemicals. It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14C02F103/02
CPCC02F5/145C02F2103/023C02F2303/08C02F2303/22
Inventor 张柏鸿李华北胡文军王坤鹏李俊峰王志成陈奇李红褚运伟陈丽鹏
Owner 鞍钢栗田(鞍山)水处理有限公司
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