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Method and device for improving chemical cleaning passivation effect

A technology for chemical cleaning and pump cleaning, applied in the field of chemical cleaning, can solve problems such as unfavorable environmental protection, toxicity, unsatisfactory secondary rust effect, etc., and achieve the effects of saving water, reducing environmental pollution, and improving passivation effect.

Active Publication Date: 2021-11-30
NORTH CHINA ELECTRICAL POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonia water is also toxic and not conducive to environmental protection, and the effect of increasing the pH on reducing secondary rust is not ideal, which has been reflected in many practical applications

Method used

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  • Method and device for improving chemical cleaning passivation effect
  • Method and device for improving chemical cleaning passivation effect
  • Method and device for improving chemical cleaning passivation effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] This embodiment provides a device for improving the passivation effect of chemical cleaning

[0104] Such as Figure 1-Figure 3 As shown, the device for improving the passivation effect of chemical cleaning includes:

[0105] Boiler cleaning system; wherein, the boiler cleaning system includes a desalinated water delivery pipeline 1, a chemical cleaning tank 2, a cleaning pump 3 and a liquid delivery pipeline 4 connected in sequence, and a rinsing liquid delivery pipeline connected to the pump inlet of the cleaning pump 3 5; wherein, the inlet end of the desalinated water delivery pipeline 1 is connected to the desalinated water supply source, the outlet end of the liquid delivery pipeline 4 is connected to the liquid inlet of the boiler equipment, and the inlet end of the rinsing liquid delivery pipeline 5 is connected to the boiler equipment The outlet of the desalted water delivery pipeline 1 is connected to the liquid inlet of the chemical cleaning tank 2, and the ...

Embodiment 2

[0118] This embodiment provides a device for improving the passivation effect of chemical cleaning

[0119] Such as Figure 4-Figure 6 As shown, the device for improving the passivation effect of chemical cleaning includes:

[0120] Boiler cleaning system; wherein, the boiler cleaning system includes a desalted water delivery pipeline 21, a chemical cleaning tank 22, a cleaning pump 23, a liquid delivery pipeline 24 connected in sequence, and a rinsing liquid delivery pipeline connected to the pump inlet of the cleaning pump 23 25; wherein, the inlet end of the desalinated water delivery pipeline 21 is connected to the desalinated water supply source, the outlet end of the liquid delivery pipeline 24 is connected to the liquid inlet of the boiler equipment, and the inlet end of the rinsing liquid delivery pipeline 25 is connected to the boiler equipment The outlet of the desalted water delivery pipeline 21 is connected to the liquid inlet of the chemical cleaning tank 22, and...

Embodiment 3

[0133] This embodiment provides a method for improving the passivation effect of chemical cleaning

[0134] The method is carried out using the device for improving the chemical cleaning passivation effect provided by embodiment 1, wherein the method includes:

[0135] 1. Washing with water after pickling in the process of chemical cleaning and passivation, the process is as follows Figure 8 Shown:

[0136] 1.1. Use the first nitrogen gas adding device 6 to fill the desalted water under pressure in the desalted water delivery pipeline 1 with the first nitrogen under pressure to form a mixture of the first desalted water and nitrogen; wherein, the desalted water delivery pipeline 1 has The mass flow rate of pressurized desalinated water is 270 tons / hour, and the amount of the first pressurized nitrogen gas is controlled to add 250 kg of liquid nitrogen for every 100 tons of pressurized desalinated water; the pressure of pressurized desalted water is 0.2-0.6MPa;

[0137] 1.2....

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Abstract

The invention provides a method and device for improving a chemical cleaning passivation effect. The device comprises a boiler cleaning system, first nitrogen adding equipment and a first water distributor; the first nitrogen adding equipment is arranged in a demineralized water conveying pipeline connected with a liquid inlet of a chemical cleaning box of the boiler cleaning system and is connected with a nitrogen supply source; and the first water distributor is arranged in the chemical cleaning box of the boiler cleaning system, the first water distributor is connected with the liquid inlet of the chemical cleaning box, and the first water distributor is a trumpet-shaped water distributor with a large outlet cross section and a small inlet cross section. The method comprises the following steps: in a chemical cleaning passivation process, when a water washing step is carried out, filling first nitrogen under pressure into demineralized water under pressure in the demineralized water conveying pipeline to form a mixture of first demineralized water and nitrogen; the mixture of first demineralized water and nitrogen enters the chemical cleaning box after being expanded by the first water distributor, so that gas-liquid separation and deoxidization of the demineralized water are realized; and conveying the demineralized water in the chemical cleaning box to boiler equipment through a cleaning pump for water washing.

Description

technical field [0001] The invention relates to a method and a device for improving the passivation effect of chemical cleaning, belonging to the technical field of chemical cleaning. Background technique [0002] Chemical cleaning of power plant boilers is a necessary measure to clean the inner surface of the heating surface of the boiler and prevent accidents caused by corrosion and scaling on the heating surface. It is also one of the effective measures to improve the thermal efficiency of the boiler and improve the water vapor quality of the unit. The chemical cleaning of the boiler is to use the aqueous solution of certain chemicals to remove the corrosion products and scale in the system, and to form a good anti-corrosion protective film on the metal surface. The chemical cleaning process generally includes four processes: alkali cleaning, pickling, water washing and rinsing, and passivation. [0003] Water flushing is required after boiler pickling. Water flushing u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/52F22B37/50
CPCF22B37/52F22B37/50
Inventor 王锐李永立吴华成刘玉鹏张洪江胡远翔
Owner NORTH CHINA ELECTRICAL POWER RES INST