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Flexible pickling method for oxide of hollow copper conductor of generator

A technology for copper wires and generators is applied in the field of flexible pickling of oxides of hollow-core copper wires of generators. Simple and easy effect of biochemical treatment

Active Publication Date: 2022-07-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the existing chemical cleaning method can better dissolve the corrosion products on the inner surface of the hollow copper conductor, there are several problems as follows: ① Under the condition of normal operation of the inner cooling water system, the corrosion products that are close to the inner surface of the hollow copper conductor Cu 2 O can exist stably
In addition, the copper corrosion inhibitor BTA or MBT has certain biological toxicity
This limits the use of biodegradable methods to treat cleaning wastewater to a certain extent.
This makes the treatment of chemical cleaning waste liquid difficult and long-term

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, the concentration of sulfamic acid in the composite pickling agent for the cold water system in the generator is 0.10 g / L, the concentration of ascorbic acid is 0.65 g / L, the concentration of disodium EDTA is 0.35 g / L, the concentration of diphosphate The concentration of potassium hydrogen phosphate was 0.02 g / L, and the concentration of dipotassium hydrogen phosphate trihydrate was 0.03 g / L.

[0041] The pickling and pickling waste treatment steps of the cold water system in the generator are as follows:

[0042] (1) System pickling

[0043] Flush the corroded hollow copper wire with variable flow with demineralized water until the effluent is clear, transparent and free of debris;

[0044] Dilute the compound pickling agent with demineralized water at 50°C to a compound pickling solution with a pH value of 5.2;

[0045] The corroded hollow copper wire is pickled by means of cyclic pickling, and the pickling flow rate is controlled to be 0.5m / s-1...

Embodiment 2

[0055] In this example, the concentration of citric acid in the compound pickling agent for the cold water system in the generator is 0.18g / L, the concentration of ascorbic acid is 0.40g / L, the concentration of disodium EDTA is 0.58g / L, the concentration of dihydrogen phosphate The concentration of potassium was 0.02 g / L, and the concentration of dipotassium hydrogen phosphate trihydrate was 0.04 g / L.

[0056] The pickling and pickling waste treatment steps of the cold water system in the generator are as follows:

[0057] (1) System pickling

[0058] Flush the corroded hollow copper wire with variable flow with demineralized water until the effluent is clear, transparent and free of debris;

[0059] Dilute the compound pickling agent with demineralized water at 50°C to a compound pickling solution with a pH value of 5.2;

[0060] The corroded hollow copper wire is pickled by means of cyclic pickling, and the pickling flow rate is controlled to be 0.5m / s-1.0m / s;

[0061] Du...

Embodiment 3

[0070] In this embodiment, the concentration of glycolic acid in the composite pickling agent for the cold water system in the generator is 0.08g / L, the concentration of ascorbic acid is 0.50g / L, the concentration of disodium EDTA is 0.60g / L, the concentration of dihydrogen phosphate The concentration of potassium was 0.02 g / L, and the concentration of dipotassium hydrogen phosphate trihydrate was 0.04 g / L.

[0071] The pickling and pickling waste treatment steps of the cold water system in the generator are as follows:

[0072] (1) System pickling

[0073] Flush the corroded hollow copper wire with variable flow with demineralized water until the effluent is clear, transparent and free of debris;

[0074] Dilute the compound pickling agent with demineralized water at 50°C to a compound pickling solution with a pH value of 5.2;

[0075] The corroded hollow copper wire is pickled by means of cyclic pickling, and the pickling flow rate is controlled to be 0.5m / s-1.0m / s;

[00...

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PUM

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Abstract

The invention discloses a flexible pickling method for oxides of a hollow-core copper conductor of a generator. The flexible pickling agent is a low-concentration solution formed by diluting a solute composed of ascorbic acid, phosphate, disodium ethylene diamine tetraacetate and organic acid in water, and the flexible pickling agent selectively dissolves CuO which is not passivated on the inner surface of the hollow copper conductor of the generator and retains Cu2O with the passivating effect. According to the invention, the cleaning environment is in a reducing environment by changing the ratio of the components in the composite pickling agent and adjusting the concentration and combining the regulation and control of the pH value of the solution, so that the flexible chemical cleaning of the oxides of the hollow-core copper conductor of the generator is realized. The post-treatment of the cleaning waste liquid is simplified by regulating and controlling the ratio of C / N / P in the composite pickling agent in advance.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning engineering of power generation equipment, and particularly relates to a flexible pickling method for oxides of hollow-core copper conductors of generators. Background technique [0002] In order to take away the heat generated by the stator coil during the operation of the generator, the water cooling of the hollow copper wire is a common cooling method. Since the cold water in the generator directly contacts the inner surface of the hollow copper wire, in order to prevent the inner cold water from corroding the copper wire, the inner cold water needs to be treated accordingly (Ye Chunsong. Research on the control principle and application technology of trace copper corrosion in pure water [ D]. Shanghai: Tongji University, 2002; DL / T 1039-2016 Guidelines for the treatment of cold water in generators [S]. Beijing: China Electric Power Press, 2016; Corrosion and Control [J]. Corrosion a...

Claims

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Application Information

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IPC IPC(8): C23G1/10
CPCC23G1/103
Inventor 叶春松王天平贾旭翔王宇
Owner WUHAN UNIV