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Anti-depositing citric acid chemical cleaning fluid

A technology of chemical cleaning and citric acid, which is applied in the field of citric acid chemical cleaning solution to prevent precipitation, can solve problems such as precipitation and chemical cleaning accidents, and achieve the effect of increasing stability and increasing the concentration of use

Inactive Publication Date: 2013-08-14
XIAN THERMAL POWER RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical cleaning with citric acid is prone to precipitation, especially when high-concentration citric acid is used to clean thermal equipment with high scale and low system water volume, chemical cleaning accidents caused by precipitation are prone to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The content of each component in a 500mL citric acid chemical cleaning solution to prevent precipitation in this embodiment is: containing 6.0%wt citric acid, 0.3%wt corrosion inhibitor, 0.1%wt reducing agent, 1.0%wtPPA, and the balance is salt water , the above %wt is the total mass percentage of the citric acid chemical cleaning solution to prevent precipitation; adjust the pH to 3.6 with ammonia water, raise the temperature to 90°C, and clean the superheater tube in actual operation. The total iron concentration is as high as 15600mg / L, and no precipitation occurs Phenomenon.

Embodiment 2

[0018] The content of each component in a kind of citric acid chemical cleaning solution 500mL that prevents precipitation in this embodiment is: containing 8.0%wt citric acid, 0.3%wt corrosion inhibitor, 0.1%wt reducing agent, 1.2%wtPPA, and the balance is For salt water, the %wt above is the total mass percentage of the citric acid chemical cleaning solution to prevent precipitation; ammonia water adjusts the pH=3.6, raises the temperature to 90°C, and cleans the superheater tube in actual operation. The total iron concentration is as large as 20400mg / L, and no occurrence precipitation phenomenon.

Embodiment 3

[0020] The content of each component in a 500mL citric acid chemical cleaning solution to prevent precipitation in this embodiment is: containing 12.0%wt citric acid, 0.5%wt corrosion inhibitor, 0.2%wt reducing agent, 1.5%wtPPA, and the balance is salt water , the above %wt is the total mass percentage of the citric acid chemical cleaning solution to prevent precipitation; adjust the pH to 3.8 with ammonia water, raise the temperature to 90°C, and clean the superheater tube in actual operation. The total iron concentration is as high as 32000mg / L, and no precipitation occurs Phenomenon.

[0021] The invention is suitable for chemically cleaning high-concentration citric acid for thermal equipment with high scale and low system water volume (such as superheaters).

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PUM

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Abstract

The invention discloses an anti-depositing citric acid chemical cleaning fluid. An anti-depositing agent PPA is added into a citric acid chemical cleaning fluid formula and accounts for 0.3-2% of the total mass of the anti-depositing citric acid chemical cleaning fluid; the anti-depositing agent PPA is an organic mixture and consists of 10%-30% of a complexing agent, 5%-10% of a surfactant and the balance of water; the complexing agent is one or more then one of gluconic acid, tartaric acid, polyacrylic acid, (2-hydroxyethyl)ethylenediamine-N, N', N'-triacetic acid, iminodiacetic acid and ethylene diamine tetra (methylene phosphonic acid) sodium, and if the complexing agent is a mixture, the ingredients in the mixture are in an arbitrary ratio; and the surfactant is one or more than one of primary alcobol ethoxylate, sodium diethylhexyl sulfosuccinate and sodium diethylhexyl sulfosuccinate, an if the surfactant is a mixture, the ingredients in the mixture an arbitrary ratio. The cleaning fluid is capable of preventing deposition phenomenon but does not generate more serious corrosion to cleaning materials; and moreover, the use concentration of citric acid can be greatly improved, and the citric acid chemical cleaning of high-scale and low-volume thermal equipment such as superheaters can be smoothly carried out.

Description

technical field [0001] The invention relates to the technical field of chemical cleaning of electric power, petrochemical and nuclear power equipment with high scale amount and low system water volume, in particular to a citric acid chemical cleaning solution for preventing precipitation. Background technique [0002] Large-capacity thermal power unit boiler superheater and reheater oxide skin peeling off, blockage caused by bursting problems have become increasingly prominent, seriously affecting the safe and stable operation of thermal power plants, citric acid is a commonly used complexing chemical cleaning agent with scale dissolution efficiency High, no chloride ion, low corrosion, no intergranular corrosion and stress corrosion to austenitic steel materials, low price, harmless to human body, easy to handle waste liquid, etc., suitable for superheater and reheater chemical cleaning. However, chemical cleaning with citric acid is prone to precipitation, especially when...

Claims

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Application Information

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IPC IPC(8): C23G1/02
Inventor 邓宇强张祥金刘峰林卫丽倪瑞涛祁东东宋飞
Owner XIAN THERMAL POWER RES INST CO LTD
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