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Boiler cleaning agent

A cleaning agent and boiler technology, applied in the field of chemical preparations for boiler cleaning, can solve the problems of long cleaning time, difficult environmental protection requirements, complicated cleaning process, etc., and achieve the effect of short cleaning time and low corrosion

Inactive Publication Date: 2014-01-15
杨桂望
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used cleaning methods include the use of hydrochloric acid, citric acid, EDTA ammonia salt, hydrofluoric acid, sulfamic acid and sulfuric acid, etc., which require two major steps of cleaning, descaling and passivation including pickling, water rinsing and rinsing. The cleaning time is long, the cleaning process is complex and consumes a large amount of desalinated water, and the amount of waste liquid treatment is large, which makes it difficult to fully meet environmental protection requirements

Method used

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Examples

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Effect test

Embodiment 1

[0031] Weigh 0.11 mol of o-phenylenediamine and 0.05 mol of sebacic acid, grind them thoroughly in a mortar to mix them uniformly, and transfer them to a three-necked flask. Add 20 mL of commercially available hydrochloric acid, 5 mL of commercially available phosphoric acid, and 75 mL of deionized water to form a mixed acid, pass nitrogen, and heat to reflux under mechanical stirring for reaction. TLC tracking and monitoring until the end of the reaction, about 10h, pour it into a 250mL beaker, let it stand for cooling, and adjust the pH=7 with concentrated ammonia water. Stand overnight at 4°C, filter and dry with suction, and recrystallize the obtained crude product with methanol / water to obtain a pure product.

Embodiment 2

[0033] Dissolve 4 g of disodium salt of EDTA in 100 g of water, add 1 g of octylphenol polyoxyethylene ether with a degree of polymerization of 10, 2 g of polyacrylic acid, 1 g of cetyl dimethyl benzyl ammonium chloride, 8 g of citric acid, and , 2.5 g of ω'-bis(benzimidazol-2-yl)alkane, 2.5 g of hydrazine hydrate, 1 g of hydrogen peroxide and 6 g of ethanol were stirred for 40 minutes to obtain a cleaning agent.

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Abstract

The invention provides a boiler cleaning agent which comprises octyl phenol polyoxyethylene ether with the degree of polymerization being 9-11, disodium salt of EDTA (Ethylene Diamine Tetraacetic Acid), polyacrylic acid, cetyl dimethyl benzyl ammonium chloride, citric acid, an inhibiter, hydrogen peroxide, ethyl alcohol and water. The boiler cleaning agent provided by the invention is short in cleaning time and small in corrosion, and the cleaning fluid and a cleaning method for completing the steps of cleaning, descaling and passivating on a power station boiler at one time are provided.

Description

technical field [0001] The invention relates to a chemical preparation and a method for cleaning a boiler, in particular to a cleaning liquid and a cleaning method for power plant boilers. Background technique [0002] Large-scale thermal power plant boilers must be chemically cleaned no matter during the infrastructure construction period or when the unit is running for a period of time when the scale of the furnace tube reaches the corresponding standard requirements, so as to obtain a clean heating surface, thereby achieving energy saving and consumption reduction and preventing the corrosion of the furnace tube. Purpose. Commonly used cleaning methods include the use of hydrochloric acid, citric acid, EDTA ammonia salt, hydrofluoric acid, sulfamic acid and sulfuric acid, etc., which require two major steps of cleaning, descaling and passivation including pickling, water rinsing and rinsing. The cleaning time is long, the cleaning process is complex and consumes a large ...

Claims

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Application Information

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IPC IPC(8): C23G5/036
Inventor 杨桂望
Owner 杨桂望
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