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Power plant boiler chemical cleaning and passivation film formation in one step to complete the composite acid solution

A technology for chemical cleaning and power plant boilers, which is applied in the coating process of metal materials, etc., can solve the problems of acid-base waste liquid discharge, storage and treatment, which are time-consuming and costly, large water consumption for chemical cleaning, and many cleaning process steps, etc., and achieve excellent results. The effect of total corrosion, labor reduction, and obvious social and economic benefits

Active Publication Date: 2016-08-17
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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  • Power plant boiler chemical cleaning and passivation film formation in one step to complete the composite acid solution
  • Power plant boiler chemical cleaning and passivation film formation in one step to complete the composite acid solution
  • Power plant boiler chemical cleaning and passivation film formation in one step to complete the composite acid solution

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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PUM

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Abstract

The invention relates to a composite acid solution for chemical cleaning and passivation film formation of a power plant boiler in one step, which comprises the following components by mass percentage: sulfuric acid: 12% to 30%; phosphoric acid: 36% to 50%; thiourea: 0% ~6.0%; Phenol: 3.0%~12.0%: Blue-826: 0.6%~1.6%: TSX-04: 0%~3.2%: Alkylphenol Polyvinyl Ether: 0%~0.8%; Carboxymethylcellulose Sodium: 0.6% to 1.2%; Sodium fluoride: 0% to 2.4%; Sodium nitrite: 1.0% to 2.0%; Demineralized water: the balance. The composite acid solution of the present invention has qualified descaling rate, excellent average metal corrosion rate and total corrosion amount, no pitting corrosion, no copper plating and good passivation protective film on the inner surface of equipment, reaching or exceeding DL / T794 "thermal power generation" The requirements for chemical cleaning quality indicators in the Guidelines for Chemical Cleaning of Plant Boilers.

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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Patent Type & Authority Patents(China)
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