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Formic acid composite cleaning agent for condensers in thermal power plants

A compound cleaning agent and thermal power plant technology, applied in the field of chemical cleaning, can solve the problems of stainless steel intergranular corrosion, severe corrosion, equipment corrosion, etc., and achieve the effect of safe dosing, small corrosion, and rapid descaling

Active Publication Date: 2018-11-06
XIAN XIELI POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of intergranular corrosion of stainless steel and serious corrosion of equipment during condenser cleaning, and provide a method that can achieve the purpose of descaling without intergranular corrosion of stainless steel. Moreover, it is a formic acid composite cleaning agent for thermal power plant condensers that has little corrosion to stainless steel and 20G carbon steel.

Method used

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  • Formic acid composite cleaning agent for condensers in thermal power plants
  • Formic acid composite cleaning agent for condensers in thermal power plants
  • Formic acid composite cleaning agent for condensers in thermal power plants

Examples

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Effect test

Embodiment 1

[0026] Taking the preparation of formic acid composite cleaning agent 1000kg as an example, the raw materials used and their quality proportions are as follows:

[0027]

[0028]

[0029] Its preparation method is as follows: first add 1.5kg of ethylene glycol and 0.2kg of surfactant OP-10 to 700kg of deionized water, heat to 60°C, then add 0.6kg of 2-mercaptobenzothiazole and stir to make 2-mercaptobenzene Parathiazole was completely dissolved, then 0.3kg of 2-aminoethyl heptadecenyl imidazoline was added, and after stirring evenly, 249.4kg of deionized water, 40kg of formic acid, and 8kg of sulfamic acid were added in sequence, and stirred evenly, to prepare a formic acid composite cleaning agent.

Embodiment 2

[0031] Taking the preparation of formic acid composite cleaning agent 1000kg as an example, the raw materials used and their quality proportions are as follows:

[0032]

[0033] Its preparation method is identical with embodiment 1.

Embodiment 3

[0035] Taking the preparation of formic acid composite cleaning agent 1000kg as an example, the raw materials used and their quality proportions are as follows:

[0036]

[0037] Its preparation method is identical with embodiment 1.

[0038] In order to determine the best raw material proportioning of the present invention, inventor has carried out a large amount of laboratory research experiments, and various test conditions are as follows:

[0039] The main medium in the cleaning agent of the present invention is formic acid, and its component size only needs to be able to dissolve the scale, which is economical and can reduce the corrosion of equipment; a small amount of aminosulfonic acid is to promote the dissolution of a small amount of insoluble matter in the scale, The remaining components are additives, which can slow down corrosion. First, determine the content of formic acid and sulfamic acid through the analysis of scale composition and scale amount, and then ...

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Abstract

The invention discloses a formic-acid-containing compound cleaner for a condenser of a thermal power plant. The cleaner is prepared from the following raw materials in percentage by mass: 3.00-5.00% of formic acid, 0.50-1.00% of sulfamic acid, 0.02-0.10% of 2-mercaptobenzothiazole, 0.05-0.20% of ethylene glycol, 0.01-0.05% of 2-aminoethyl heptadecenyl imidazoline, 0.00-0.05% of a surfactant OP-10 and the balance of deionized water. The cleaner is adopted for cleaning the condenser of which the main material is a stainless steel tube, a copper tube or a titanium tube; when the above three materials are cleaned by adopting the cleaner, the corrosion rates are all lower than 0.1 g / m<2>.h, and the stainless steel tube can be protected from intergranular corrosion; meanwhile, the corrosion rate of carbon steel for a water chamber and a temporary system can be lower than 0.5 g / m<2>.h; all the above corrosion rates are far below the relevant standards and the descaling effect is obvious; and therefore, the cleaner can be widely applied to chemical cleaning of condensers of which heat exchange tubes adopt stainless steel tubes and titanium tubes as main materials.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning of electric power or chemical industry equipment, and in particular relates to a chemical cleaning agent for tubular heat exchangers such as condensers in power stations. Background technique [0002] With the development of the economy, human beings have an increasing demand for water resources. In order to meet the water demand, deep water wells, polluted rivers, and river water are all used in the circulating cooling water system of the power plant. During the operation of the condenser heat exchange system , the circulating cooling water is continuously volatilized and concentrated, microorganisms, calcium and magnesium salts, etc. in the cooling water will be precipitated and attached to the surface of the heat exchange tube of the condenser, causing fouling of the heat exchange tube of the condenser, and finally leading to a sharp drop in heat exchange efficiency. And increase the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06
CPCC23G1/06C23G1/063C23G1/065
Inventor 张全根姚进伟李卫锋胡宗波宫舒扬
Owner XIAN XIELI POWER TECH
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