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
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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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