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Compound acid liquor of chemically cleaning power station boiler and passivating and forming film by one step

A technology for chemical cleaning and power plant boilers, applied in the direction of metal material coating process, etc., can solve the problems of acid and alkali waste liquid discharge, storage and treatment time-consuming and expensive, large water consumption for chemical cleaning, and many cleaning process steps, etc. The total amount of corrosion, the reduction of labor, and the obvious social and economic benefits

Active Publication Date: 2014-09-03
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current problems in the cleaning work are as follows: 1. There are many types of chemicals used in different forms, and the workload of adding them to the system is large; 2. There are many cleaning process steps, frequent system operations and long time consumption; 3. Chemical cleaning water Large volume, time-consuming and expensive discharge, storage and treatment of acid-base waste liquid

Method used

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  • Compound acid liquor of chemically cleaning power station boiler and passivating and forming film by one step
  • Compound acid liquor of chemically cleaning power station boiler and passivating and forming film by one step
  • Compound acid liquor of chemically cleaning power station boiler and passivating and forming film by one step

Examples

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Effect test

example 1

[0023] If there is no copper scale in the deposit, thiourea can not be added, and the composite acid solution includes the following components mixed in mass percentage:

[0024]

example 2

[0026] When cleaning the operating boiler with low oil content, TSX-04 and alkylphenol polyvinyl ether can be added less or not, and the compound acid liquid includes the following components mixed by mass percentage:

[0027]

example 3

[0029] Sodium fluoride is not added when cleaning materials such as austenitic steel or chromium-containing steel, and the composite acid solution includes the following components mixed by mass percentage:

[0030]

[0031] The technical process of the compound acid solution in the above examples is three steps of water washing, pickling and standing. The time of the whole process can be shortened from about 72 hours to about 24 hours, and the cleaning effect can reach or exceed DL / T794 "firepower The chemical cleaning quality index requirements in the Power Plant Boiler Chemical Cleaning Guidelines.

[0032] The method of using compound acid solution for chemical cleaning and passivation film formation of power plant boilers in one step:

[0033] 1. Determine the scale amount, scale type and water volume of the chemically cleaned boiler through a small test, select a reasonable type of drug and the amount of drug added, and configure a certain amount of "power plant boile...

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Abstract

The invention relates to compound acid liquor of chemically cleaning a power station boiler and passivating and forming a film by one step. The acid liquor comprises the following components in percentage by weight: 12-30% of sulfuric acid, 36-50% of phosphoric acid, 0-6.0% of thiourea, 3.0-12.0% of phenol, 0.6-1.6% of indigo plant-826, 0-3.2% of TSX-04, 0-0.8% of alkylphenol polyvinyl ether, 0.6-1.2% of sodium carboxymethylcellulose, 0-2.4% of sodium fluoride, 1.0-2.0% of sodium nitrite and the balance of demineralized water. The compound acid liquor provided by the invention has qualified descaling rate, excellent metal average corrosion rate and total corrosion and is free from pitting corrosion and copper plating, and a good passivating protective film on the inner surface is formed in the equipment, so that the compound acid liquor reaches or exceeds the quality index request of chemical cleaning in DL / T794 Boiler Chemical Cleaning Guide Rue of Thermal Power Plant.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning of power plant boilers, in particular to a composite acid solution for chemical cleaning and passivation film formation of a power plant boiler in one step. Background technique [0002] Boiler chemical cleaning is the behavior of removing various non-body impurities on the inner surface of the water vapor system and forming a good passivation film on the metal surface through chemical methods. The general process sequence of the chemical cleaning process steps is: water washing, alkali washing, water washing after alkali washing, Pickling, water rinse after pickling, rinsing and passivation. At present, when the amount of scale on the fire side of the power plant boiler exceeds a certain amount, chemical cleaning is required. Through a certain process, chemical agents are used to clean the heated inner surface and form a passivation protective film. The current problems in the cleaning...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23C22/36C23C22/07
Inventor 郭军科苏展于金山卢立秋林琳路菲赵鹏郝春燕卢修春
Owner STATE GRID CORP OF CHINA
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