Method for inhibiting ammonia nitrogen corrosion of urban recycled water circular cooling system

A technology of water circulation cooling and urban reclaimed water, which is applied in chemical instruments and methods, descaling and water softening, water treatment parameter control, etc. It can solve the problems of aggravating system scaling and increasing the dosage of water treatment chemicals, so as to achieve less consumption , excellent effect

Active Publication Date: 2013-07-31
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of adding lye, the control requirements for the pH value of circulating water are often not clear. It is generally believed that the pH value of the circulating water should be greater than 7.0. For urban reclaimed water with high ammonia nitrogen content, this dosage method often leads to an increase in the amount of water treatment chemicals And aggravate the fouling phenomenon of the system

Method used

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  • Method for inhibiting ammonia nitrogen corrosion of urban recycled water circular cooling system
  • Method for inhibiting ammonia nitrogen corrosion of urban recycled water circular cooling system
  • Method for inhibiting ammonia nitrogen corrosion of urban recycled water circular cooling system

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The test raw water in this embodiment is the ammonia-nitrogen-containing reclaimed water discharged from a sewage treatment plant used by a power plant in the South Power Grid of Hebei. The quality of the test raw water is shown in Table 2.

[0026] Table 2 Raw water quality analysis

[0027]

[0028] Add composite corrosion and scale inhibitors to the test water first, so that the concentrations of each component are: hydroxyethylene diphosphonic acid (HEDPA) 2mg / L, aminotrimethylene phosphonic acid (ATMP) 10mg / L, Sodium molybdate 10mg / L, zinc sulfate 2mg / L, sodium tripolyphosphate 2mg / L, sodium gluconate 5mg / L, polymaleic anhydride 3mg / L, then add NaOH to adjust the pH value to 9.0, refer to HG / T 2159-91 "Determination of Corrosion Inhibition Performance of Water Treatment Agents by Rotating Coupon Method" conducts the corrosion test of the rotating coupon. The material of the test piece is carbon steel, and the corrosion rate of the rotating coupon is 0.036mm / a. ...

Embodiment 2

[0030] The water quality and other experimental conditions of this embodiment are the same as those of Example 1, except that the pH value is adjusted to 11.0 after adding the corrosion and scale inhibitor, and the calcium and magnesium ion content before and after the pH value is measured, and the calcium ion is 39.3mg / L Down to 25.4mg / L, magnesium ions dropped from 36.5mg / L to 29.5mg / L, indicating scaling.

Embodiment 3

[0032] The test raw water quality of the present embodiment is shown in Table 3.

[0033] Table 3 Raw water quality analysis

[0034]

[0035] Add composite corrosion and scale inhibitors to the test water first, among which HEDPA is 7mg / L, ATMP is 6mg / L, sodium molybdate is 2mg / L, zinc sulfate is 0.5mg / L, sodium tripolyphosphate is 5mg / L, gluconic acid Sodium is 0.5mg / L, polymaleic anhydride is 1mg / L, and NaOH is added to adjust the pH value to 8.3. The corrosion rate of the carbon steel rotary coupon is 0.031mm / a. The pH value is adjusted but the rotary coupon is not added. The corrosion rate is 2.62mm / a, and the corrosion rate of the rotary coupon with no adjustment of pH value but adding chemicals is 1.79mm / a. Before and after adjusting the pH value, the content of calcium and magnesium ions in the measured water did not change significantly, indicating that no scaling occurred.

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Abstract

Provided is a method for inhibiting ammonia nitrogen corrosion of urban recycled water circulating cooling system, which comprises: adding corrosion and scale inhibiting agent into urban recycled water to form a concentration of 8 to 48 mg / L; and regulating the pH value of the urban recycled water by using an inorganic alkaline matter according to the ammonia nitrogen content in the urban recycled water, namely regulating the pH value to 7.5 to 8.0 when the ammonia nitrogen content is less than 60mg / L, regulating the pH value to 8.0 to 8.5 when the ammonia nitrogen content is between 60 and 95mg / L and regulating the pH value to 8.5 to 9.5 when the ammonia nitrogen content is between 95 and 150mg / L. In the method, by adding the corrosion and scale inhibiting agent into urban recycled water and keeping the pH value in a proper range, the corrosion and scale of the high-ammonia-nitrogen-content recycled water circulating cooling system are minimized, which is favorable for the long-term stable operation of the system. In the method, the consumption of the corrosion and scale inhibiting agent is small, and in the proper pH value range, the corrosion and scale inhibiting effect is excellent.

Description

technical field [0001] The invention relates to a method for suppressing ammonia nitrogen corrosion of a water circulation cooling system in a city. technical background [0002] Urban reclaimed water is also called regenerated water. Its water quality is between sewage and tap water. It is non-drinking water that can be used within a certain range after urban sewage and wastewater have been purified to meet national standards. It can be used for circulation in circulating cooling systems. Cooling water replenishment is of great significance for effectively solving the problem of water shortage. [0003] The temperature of the circulating water is in the range of 10-40℃ all year round, and it is sunny and rich in nutrients, which is a favorable environment for the growth and reproduction of bacteria. Urban water generally contains ammonia nitrogen, which is also called ammonia nitrogen, which includes free ammonia nitrogen NH 3 -N and ammonium nitrogen NH 4 + -N. When t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/08C02F5/14C02F5/10
CPCC02F2303/08C02F5/14C02F2209/06
Inventor 刘克成桑俊珍龙潇马东伟任汉涛
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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