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Descaling device and method of circulation cooling water system

A technology of circulating cooling water and descaling agent, applied in descaling and water softening, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as secondary pollution and zinc ion secondary pollution, and achieve descaling rate Improve, reduce secondary pollution, reduce the effect of dosage

Inactive Publication Date: 2018-05-11
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The effect of chemical descaling method is obvious, but it is easy to cause secondary pollution. The scale inhibition rate is high at 100 mg / L, but it brings secondary pollution such as zinc ions, so it should be used in a small amount

Method used

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  • Descaling device and method of circulation cooling water system
  • Descaling device and method of circulation cooling water system
  • Descaling device and method of circulation cooling water system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] When M is 300T m, the length of the adjustable permanent magnet 7 is L=10m, then the magnetic field strength is selected to be B=30T, the flow rate of the circulating cooling water is v=2m / s, and the cross-sectional area of ​​the pipeline is S=4m 2 , tank volume V=40m 3 , the magnetic field needs to run t=5h in advance before adding the prepared antiscalant scale agent m=2kg, and then run for 24h and then take a sample to measure the hardness of the circulating water to obtain a scale inhibition rate of 91.5%, and the cooling part 4 There is no scale deposition in the pipes and pipes, and the scale at the bottom of the tank is collected and scanned with an electron microscope to find that the scale structure is relatively loose, such as figure 2 As shown, it shows that the scale proportion of calcite structure is greatly reduced, and the expected scale inhibition effect is achieved.

Embodiment 2

[0022] When M is 350T m, the length of the adjustable permanent magnet 7 is L=7m, then the magnetic field strength is selected to be B=50T, the flow rate of the circulating cooling water is v=5m / s, and the cross-sectional area of ​​the pipeline is S=2m 2 , tank volume V=50m 3 , the magnetic field needs to run t=5h in advance before adding the prepared antiscalant and scale agent m=2.5kg. Then after running for 24 hours, samples were taken to measure the hardness of the circulating water, and the scale inhibition rate was 93%, and there was no scale deposition in the cooling part 4 and the pipeline. The scale at the bottom of the tank was collected and scanned with an electron microscope to find that the scale structure was relatively loose. image 3 As shown, it shows that the scale proportion of calcite structure is greatly reduced, and the expected scale inhibition effect is achieved.

Embodiment 3

[0024] When M is 400T m, the length of the adjustable permanent magnet 7 is L=8m, then the magnetic field strength is selected to be B=50T, the flow rate of the circulating cooling water is v=3m / s, and the cross-sectional area of ​​the pipeline is S=5m 2 , tank volume V=60m 3 , the magnetic field needs to run t=4h in advance before adding the prepared antiscalant scale agent m=3kg; then run for 24h and then take a sample to measure the hardness of the circulating water to obtain a scale inhibition rate of 95%, and the cooling part 4 There is no scale deposition in the pipes and pipes, and the scale at the bottom of the tank is collected and scanned with an electron microscope to find that the scale structure is relatively loose, such as Figure 4 As shown, it shows that the scale proportion of calcite structure is greatly reduced, and the expected scale inhibition effect is achieved.

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Abstract

The invention relates to a descaling device and method, in particular to a descaling device and method of a circulation cooling water system. According to the descaling device of the circulation cooling water system, a water tank, a pump, a valve, a cooling part and a flow meter are connected into a closed loop through a pipe, a scale inhibitor storage tank is connected onto the water tank, and anadjustable permanent magnet is arranged on the pipe. According to the descaling method, in order to improve the descaling efficiency, a scale inhibitor is added after the magnetic field runs for a certain period, remaining scaling ions are removed by the scale inhibitor, the number of hydrogen bonds and activation energy of a water system can be increased through positive ions in the scale inhibitor, and accordingly the descaling rate is greatly increased; the proportion of aragonite to vaterite can be conveniently increased, the proportion of calcite is reduced, the descaling efficiency of the scale inhibitor can also be improved through the magnetic field, the use quantity of the composite non-phosphorus corrosion and scale inhibitor is greatly lowered at the same time, the production cost is lowered, and secondary pollution is reduced.

Description

technical field [0001] The invention relates to a descaling device and a descaling method, in particular to a descaling device and a descaling method for a circulating cooling water system. Background technique [0002] Water is an essential resource for modern industrial production. With the rapid development of industry, the water consumption in the industrial field has increased significantly. In order to save water resources, the water supply mode of circulating cooling water + wastewater treatment as cooling water replenishment water has been widely adopted in the industry. But this brings a series of problems such as scaling and corrosion of the circulating water cooling system. Only the national iron and steel plants spend tens of billions of dollars on scale cleaning and heat loss caused by scaling each year. Therefore, using a quick and convenient method to remove scale and prevent scale is one of the key issues of energy conservation and environmental protection....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F1/48
CPCC02F1/481C02F5/125
Inventor 姚夏妍鲁兴武程亮张恩玉崔海瑞
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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