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 increasing the amount of water treatment chemicals and aggravating system fouling, and achieves a small amount of use , excellent effect

Active Publication Date: 2012-01-04
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

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
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] 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 Hebei South Power Network. The water quality of the test raw water is shown in Table 2.

[0027] Table 2 Analysis of raw water quality

[0028]

[0029] Add a composite corrosion and scale inhibitor to the test water to make the concentration of each component: hydroxyethylene diphosphonic acid (HEDPA) 2mg / L, amino trimethylene 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, add NaOH to adjust the pH to 9.0, refer to HG / T 2159-91 "Determination of Corrosion Inhibition Performance of Water Treatment Agents: Rotating Coupon Method" to carry out the corrosion test of the rotating coupon. The test piece is made of carbon steel. The corrosion rate of the rotating coupon is 0.036mm / a. Adjust the ...

Example Embodiment

[0030] Example 2

[0031] The water quality and other experimental conditions in this example are the same as those in Example 1. The difference is that the pH value is adjusted to 11.0 after adding the corrosion and scale inhibitor, and the content of calcium and magnesium ions before and after the pH value is measured. The calcium ions are changed from 39.3mg / L It is reduced to 25.4mg / L, and magnesium ion is reduced from 36.5mg / L to 29.5mg / L, indicating that scaling has occurred.

Example Embodiment

[0032] Example 3

[0033] The test raw water quality of this example is shown in Table 3.

[0034] Table 3 Raw water quality analysis

[0035]

[0036] Add a compound corrosion and scale inhibitor to the test water first, in 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 then NaOH is added to adjust the pH to 8.3, the corrosion rate of the carbon steel rotary coupon is 0.031mm / a, the pH is adjusted but no chemicals are added to the rotary coupon The corrosion rate is 2.62mm / a, and the corrosion rate of the rotary coupon without adjusting the 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 there was no scaling phenomenon.

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Abstract

The invention relates to a method for inhibiting ammonia nitrogen corrosion of water circular cooling system in cities, which comprises: adding corrosion and scale inhibiting agent into urban recycled water at a concentration of 8 to 48mg/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 recycledwater, 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 invention, by adding the composite 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 circular cooling system are reduced to the maximum degree, which isgood for the long-term stable operation of the system. In the invention, the consumption of the composite corrosion and scale inhibiting agent is small, and in the pH value range of the invention, 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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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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