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A kind of air preheater chemical cleaning agent

A technology of air preheater and cleaning agent, which is applied in the direction of detergent compounding agent, detergent composition, chemical equipment and methods, etc., and can solve the problem of ash plugging, affecting the normal operation of the heat exchange boiler of the preheater, corrosion of the preheater, etc. problems, achieve the effect of reducing adhesion, reducing the clogging rate of air preheater, and prolonging the running time

Active Publication Date: 2021-03-02
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For coal-fired boilers, the content of fly ash in the flue gas is relatively high, and ammonium hydrogen sulfate is liquid in the temperature range of 146°C-207°C; the liquid ammonia hydrogen sulfate has a strong ability to capture fly ash, and it will interact with fly ash particles in the flue gas Combined, it adheres to the heat transfer element of the preheater to form molten salt-like ash, causing corrosion and ash blocking of the preheater, which in turn affects the heat exchange of the preheater and the normal operation of the boiler
[0003] When the air preheater is gradually blocked, under the same load, the differential pressure of the air preheater increases, the current of the induced draft fan increases, and the flow rate of the flue gas decreases. The fan current and flue gas flow are at normal levels, and ordinary detergents have no effect on cleaning the air preheater

Method used

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  • A kind of air preheater chemical cleaning agent
  • A kind of air preheater chemical cleaning agent
  • A kind of air preheater chemical cleaning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A chemical cleaning agent for an air preheater, comprising an alkali agent, an emulsifier and an additive, the emulsifier being sodium dodecylbenzene sulfonate, sodium alkyl succinate sulfonate, polyoxyethylene alkyl ether, and the additive being alkane Base benzene sulfonate, polyamide, organosilicon, trisodium phosphate, alkali agent is sodium hydroxide, the content of each component is: sodium dodecylbenzene sulfonate content of 20% by mass, alkyl sulfosuccinate The mass percentage content of sodium bicarbonate is 25%, the mass percentage content of polyoxyethylene alkyl ether is 15%, the mass percentage content of alkylbenzene sulfonate is 15%, the polyamide mass percentage content is 6%, and the organic silicon mass percentage content is 5%, the mass percentage content of trisodium phosphate is 10%, and the mass percentage content of sodium hydroxide is 4%. Stir and mix the components evenly to prepare the air preheater chemical cleaning agent.

[0025] A newly in...

Embodiment 2

[0031] In this embodiment, the cleaned 700MW coal-fired unit #1 boiler A and B side air preheaters in the embodiment 1 are cleaned again after running under the same conditions for the same time. The proportioning and consumption of the air preheater chemical cleaning agent used are exactly the same as in Example 1. The cleaning method is also completely consistent with the cleaning process.

[0032] After the air preheater is cleaned, the differential pressure is significantly reduced, and the current of the induced draft fan is significantly reduced, achieving the expected effect. The operating parameters before and after cleaning under the same load are compared in the table below.

[0033]

[0034] Compared with Example 1, after running for a week under the same conditions, the adhesion of dirt has decreased, indicating that the passivation film formed by the cleaning agent on the metal surface of the air preheater can effectively reduce the adhesion rate of dirt and p...

Embodiment 3

[0036] In this embodiment, the cleaned 700MW coal-fired unit #1 boiler A, B side air preheater in embodiment 2 is cleaned again after running under the same conditions for the same time. The proportion of the cleaning agent has been slightly adjusted. The chemical cleaning agent used for the air preheater contains alkali agent, emulsifier and additives. The emulsifier is sodium dodecylbenzene sulfonate, sodium alkyl succinate sulfonate, polyoxyethylene Alkyl ether, additives are alkylbenzene sulfonate, polyamide, organosilicon, trisodium phosphate, alkali agent is sodium hydroxide, the content of each component is: sodium dodecylbenzene sulfonate, the mass percentage content is 19% , the mass percentage content of sodium alkyl ester sulfosuccinate is 24%, the mass percentage content of polyoxyethylene alkyl ether is 14%, the mass percentage content of alkylbenzene sulfonate is 15.5%, and the mass percentage content of polyamide is 6.5% %, the mass percentage content of organic...

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Abstract

The invention provides a chemical cleaning agent for an air preheater, which comprises sodium dodecylbenzenesulfonate, sodium alkylsulfonate succinate, polyoxyethylene alkyl ether, alkylbenzenesulfonate, polyamide, Organic silicon, trisodium phosphate, and sodium hydroxide are special cleaning agents for cleaning the air preheater. They can clean the air preheater online without affecting the operation of the air preheater. The cleaning effect is good and the scale removal rate is high. practical.

Description

technical field [0001] The invention belongs to the cleaning field of an air preheater of a coal-fired power plant, and in particular relates to a chemical cleaning agent for an air preheater. Background technique [0002] Ammonia escape exists objectively in the SCR denitrification process. The process of ammonia escape and SO in flue gas 3 The reaction produces ammonium bisulfate, which is gaseous, liquid, and granular at different temperatures. Gaseous or granular liquid ammonium bisulfate will flow through the preheater with the flue gas and will not affect the preheater. For coal-fired boilers, the content of fly ash in the flue gas is relatively high, and ammonium bisulfate is liquid in the temperature range of 146°C-207°C; liquid ammonium bisulfate has a strong ability to capture fly ash and will interact with fly ash particles in the flue gas Combined, it adheres to the heat transfer element of the preheater to form molten salt-like ash deposits, causing corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D1/83C11D3/60C11D3/37C11D3/06C11D3/16C11D3/04B08B3/08
CPCB08B3/08C11D1/22C11D1/28C11D1/72C11D1/83C11D3/044C11D3/06C11D3/16C11D3/3719C11D11/0041
Inventor 徐锐邓永强夏永俊钟用禄李海山
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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