Neutral chemical cleaning agent for eliminating hard scales of air pre-heater of desulfurization system and preparation method of neutral chemical cleaning agent

A desulfurization system and cleaning agent technology, applied in the field of chemical cleaning, can solve the problems of more hard scale formation, poor effect, blockage, etc., and achieve the effect of improving the desulfurization efficiency, removing the hard scale thoroughly, and improving the operation rate.

Inactive Publication Date: 2015-07-01
SHANGHAI WEILAI ENTERPRISE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional cleaning method is to use high-pressure water, which is not effective, and will cause more and more hard dirt, and finally cause blockage

Method used

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  • Neutral chemical cleaning agent for eliminating hard scales of air pre-heater of desulfurization system and preparation method of neutral chemical cleaning agent
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  • Neutral chemical cleaning agent for eliminating hard scales of air pre-heater of desulfurization system and preparation method of neutral chemical cleaning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present invention is a kind of neutral chemical cleaning agent for removing the hard scale of the air preheater of the desulfurization system, and the formula is as follows:

[0026]

[0027] The preparation method of the above-mentioned neutral chemical cleaning agent: according to the above ratio, first add water, then add the main cleaning agent, then slowly add liquid caustic soda, (the temperature is controlled below 50°C) and stir evenly, then add surfactant, infiltrate agent, stir evenly.

Embodiment 2

[0032] The present invention is a kind of neutral chemical cleaning agent for removing the hard scale of the air preheater of the desulfurization system, and the formula is as follows:

[0033]

[0034]

[0035] The preparation method of the above-mentioned neutral chemical cleaning agent: according to the above ratio, first add water, then add the main cleaning agent, then slowly add liquid caustic soda, (the temperature is controlled below 50°C) and stir evenly, then add surfactant, infiltrate agent, stir evenly.

[0036] Corrosion test of the above-mentioned neutral chemical cleaning agent:

[0037] Test method: Spray the above cleaning agent on the scaled 20# carbon steel and ceramic cutting discs respectively.

[0038] Test results: At room temperature, the static wet time is 8 hours, and the scale with a thickness of about 1.5cm will completely expand and melt. The average corrosion rate of 20# carbon steel is 0.00105g / m 2 h, the average corrosion rate of cerami...

Embodiment 3

[0040] The present invention is a kind of neutral chemical cleaning agent for removing the hard scale of the air preheater of the desulfurization system, and the formula is as follows:

[0041]

[0042] The preparation method of the above-mentioned neutral chemical cleaning agent: according to the above ratio, first add water, then add the main cleaning agent, then slowly add liquid caustic soda, (the temperature is controlled below 50°C) and stir evenly, then add surfactant, infiltrate agent, stir evenly.

[0043] Corrosion test of the above-mentioned neutral chemical cleaning agent:

[0044] Test method: Spray the above cleaning agent on the scaled 20# carbon steel and ceramic cutting discs respectively.

[0045] Test results: At room temperature, the static wet time is 4 hours, and the scale with a thickness of about 1.5cm will completely expand and melt. The average corrosion rate of 20# carbon steel is 0.00105g / m 2 h, the average corrosion rate of ceramic cutting disc...

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Abstract

The invention discloses a neutral chemical cleaning agent for eliminating hard scales of an air pre-heater of a desulfurization system and a preparation method of the neutral chemical cleaning agent. The neutral chemical cleaning agent is compounded of a main cleaning agent, a surfactant, a penetrant, caustic soda liquid and water. The cleaning agent has complexing action with aluminum metasilicate and silicate scales on the surface (in contact with the cleaning agent) of the air pre-heater to achieve the purpose of dissolving dirt; by virtue of permeation and swelling, cracks and gaps are generated in an inner structure of a scale layer. The cleaning agent adopts a safe and environmental-friendly neutral scheme and is free of toxicity. The main compound, namely the main cleaning agent, is easily biodegraded so that the environmental problems are avoided; the cleaning agent has the characteristics of quickly removing scales and not corrode a steel frame, not damaging an enameled heat exchange component, not damaging the flak anticorrosive material and the like. When used for cleaning the air pre-heater, the neutral chemical cleaning agent has the beneficial effects that the removal rate of hard scales is 98% or above, and the light transmittance of the air pre-heater reaches 95% or above, and moreover, the heat exchange efficiency of the heat exchange equipment is improved, a vent channel is dredged, and safe and economical operation of the unit is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning, and relates to a chemical neutral cleaning agent, in particular to a neutral chemical cleaning agent for removing hard scale of an air preheater of a desulfurization system and a preparation method thereof. Background technique [0002] The construction and operation of the limestone-gypsum desulfurization system in thermal power plants is for the completion of the national "Eleventh Five-Year" SO 2 Emission reduction targets play an important role. In the desulfurization system, the air preheater is arranged in the flue after the economizer, and uses the waste heat of the flue gas to heat the air required for boiler combustion to improve the economy of the entire unit. Since the flue gas contains water vapor, the dew point of the water vapor in the flue gas (i.e. water dew point) is generally at 30-60°C, which is relatively low. There will be no condensation on the heating surface. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D10/02
Inventor 刘建凤陆军姚永清
Owner SHANGHAI WEILAI ENTERPRISE
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