Washing liquid applied to station boiler and washing method

A technology for power station boilers and cleaning liquids, which is applied to boiler cleaning devices, boiler cleaning control devices, metal material coating processes, etc. time, the effect of simplifying the cleaning steps

Inactive Publication Date: 2009-11-11
湖南省湘电试验研究院有限公司 +1
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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 ri

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present invention is used for the cleaning liquid of utility boiler, mainly is made up of the component of following mass percentage:

[0026] Ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetetraacetic acid disodium salt 4%, appropriate amount of sodium hydroxide, urotropine 0.2%, thiourea or di-o-toluenethiourea 0.1%, mercaptobenzothiazole 0.08%, Alkylphenol polyoxyethylene ether (OP-10) 0.03%, octylphenol polyoxyethylene ether (TX-10) 0.06%, and the balance is water;

[0027] The mass ratio of the ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetetraacetic acid disodium salt is 1:4.

Embodiment 2

[0029] The present invention is used for the cleaning fluid of utility boiler, adopts the formula of following mass percentage:

[0030] Ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetetraacetic acid disodium salt 12%, appropriate amount of sodium hydroxide, urotropine 0.3%, thiourea or di-o-toluenethiourea 0.2%, mercaptobenzothiazole 0.05%, Alkylphenol polyoxyethylene ether (OP-10) 0.01%, octylphenol polyoxyethylene ether (TX-10) 0.03%, and the balance is water;

[0031] The mass ratio of the ethylenediaminetetraacetic acid (EDTA) and disodium salt of ethylenediaminetetraacetic acid is 1:6.

Embodiment 3

[0033] The present invention is used for the cleaning fluid of utility boiler, adopts the formula of following mass percentage:

[0034] Ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetetraacetic acid disodium salt 8%, appropriate amount of sodium hydroxide, urotropine 0.25%, thiourea or di-o-toluenethiourea 0.15%, mercaptobenzothiazole 0.06%, Alkylphenol polyoxyethylene ether (OP-10) 0.02%, octylphenol polyoxyethylene ether (TX-10) 0.05%, and the balance is water;

[0035] The mass ratio of the ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetetraacetic acid disodium salt is 1:5.

[0036] The content of sodium hydroxide in the above examples is based on adjusting the initial pH value of the cleaning solution to 4.5-5.5.

[0037] The present invention adopts above-mentioned cleaning liquid to be used for the cleaning method of utility boiler, comprises the following steps:

[0038] (1) Adjust the water pressure of the boiler to meet the requirements, iso...

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PUM

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Abstract

The invention discloses a washing liquid applied to a station boiler and a washing method; wherein the washing liquid comprises the following components according to mass percent: 4-12% of ethylene diamine tetraacetic acid(EDTA) and ethylene diamine tetraacetic acid disodium salt, moderate amount of sodium hydroxide, 0.2-0.3% of methenamine, 0.1-0.2% of thiourea or di-o-tolyl-thiourea, 0.05-0.08% of mercaptobenzothiazole, 0.01-.0.3% of alkylphenol polyethenoxy ether(OP-10), 0.03-0.06% of octyl phenol polyethenoxy ether (TX-10), and the excess of water. In the method of the invention, processes such as acid cleaning, passivation and inhibition are organically combined, thus simplifying the cleaning sequences; as alkaline matter is generated by the washing liquid in the process of decomposition and incrustation dissolving, pH value of the washing liquid can be increased along with the washing process and the pH value is more than 8.5, thus realizing one-step completion of washing and passivation.

Description

technical field [0001] The invention belongs to a chemical preparation and a method for cleaning boilers, 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 a...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23C22/60F22B37/48F22B37/56
Inventor 陈绍艺张玉福
Owner 湖南省湘电试验研究院有限公司
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