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Cleaning agent

A cleaning agent and surfactant technology, applied in the field of chemical cleaning agents that are difficult to dissolve scale, can solve problems such as corrosion, expensive raw materials, and damage to the enamel anti-corrosion layer, and achieve the effect of strong cleaning ability

Inactive Publication Date: 2010-05-12
COUNTRY JIANGSU CATALYST REGENERATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the alkaline boiling conversion method for cleaning, it will cause corrosion to the GGH, which is mainly enamel heat exchange elements, and the phenomenon of porcelain explosion will destroy the enamel anti-corrosion layer; when using organic polymer complexing agents for cleaning, due to expensive raw materials and high cleaning costs. Not widely applicable to SMEs
At the same time, these two methods are inseparable from heating and take a long time, which greatly limits the actual field application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Preparation of potassium lactate

[0016] a. Slowly add quantitative solid potassium hydroxide to deionized water, and simultaneously take cooling measures to cool and continuously stir until completely dissolved to obtain the required potassium hydroxide solution;

[0017] b. Add a certain amount of lactic acid to the prepared potassium hydroxide solution, and simultaneously take cooling measures to cool and keep stirring; when the amount of lactic acid added reaches 80% of the total amount of lactic acid, suspend stirring and allow it to fully react; after 20 minutes , add lactic acid in the form of dropwise and continue to stir, stop stirring after 30 minutes, measure the pH value as 9, and obtain the desired potassium lactate.

[0018] 2. Clean sulfate insoluble dirt

[0019] Take 250ml of potassium lactate with 35% pH of 9, 0.01% surfactant OP-10, 0.2% penetration enhancer JFC, and water to form a cleaning agent; prepare 30g of calcium sulfate For gypsum lath,...

Embodiment 2

[0021] 1. Preparation of ammonium polymaleate and ammonium polyacrylate

[0022] a, take quantitative liquid ammonia, slowly feed the liquid ammonia in the stainless steel absorption tower, and dissolve the liquid ammonia into the deionized water by spraying the deionized water to obtain the required ammonia solution;

[0023] B, join quantitative polymaleic acid in the prepared ammonia solution, take cooling measures to cool and constantly stir simultaneously; After 20 minutes, add polymaleic acid dropwise and continue stirring, stop stirring after 30 minutes, and measure the pH value to be 9 to obtain the desired ammonium polymaleic acid salt.

[0024] c. Add quantitative polyacrylic acid to the prepared ammonia solution, and take cooling measures to cool and keep stirring; when the amount of polyacrylic acid added reaches 80% of the total polyacrylic acid, stop stirring and let it fully react; 20 minutes Finally, polyacrylic acid was added dropwise and the stirring was con...

Embodiment 3

[0030] From October 1st to October 9th, 2009, the cleaning of a #2 unit GGH with a generating capacity of 600MW in Huaneng Tongchuan Power Plant:

[0031] Sampling and testing the dirt on the enamel heat exchange plate of the device to be cleaned, which contains 56.8% calcium sulfate, 6.1% magnesium sulfate, 7.3% calcium silicate and other ingredients;

[0032] 1. Preparation of sodium glycolate

[0033] a. Slowly add quantitative solid sodium hydroxide to deionized water, and simultaneously take cooling measures to cool and keep stirring until completely dissolved to obtain the required sodium hydroxide solution;

[0034] b. Add quantitative glycolic acid to the prepared sodium hydroxide solution, and simultaneously take cooling measures to cool and keep stirring; when the amount of glycolic acid added reaches 80% of the total glycolic acid amount, stop adding, continue stirring, and let it Fully react; after 20 minutes, add glycolic acid in the form of dropwise and continue...

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PUM

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Abstract

The invention discloses a chemical cleaning agent for cleaning hardly solvable dirt containing sulfate, comprising the following components by weight percent: 5-50wt% of organic carboxylate, 0-2wt% of surfactant OP-10, 0-2wt% of penetration enhancer JFC, and the balance water. The invention has the beneficial effects that the cleaning agent can rapidly clean hardly solvable dirt containing sulfate at normal temperature, is easily decomposed in environment as the clean agent is neutral-alkali and nontoxic, thereby having no danger to environment, no progressive danger, and no special treatment on cleaning waste liquor, therefore, the chemical cleaning agent is environment-friendly cleaning agent.

Description

technical field [0001] The invention relates to a chemical cleaning agent, in particular to a chemical cleaning agent used for cleaning refractory scale containing sulfate. Background technique [0002] Sulfate substances such as calcium sulfate and magnesium sulfate are insoluble substances, and dirt containing sulfate is widely found in industrial fields. For example, circulating cooling water systems containing more sulfate ions in water sources, boiler water, and circulating cooling water systems that excessively use sulfate ion water treatment agents, etc., will produce insoluble dirt containing calcium sulfate and magnesium sulfate. For another example, a thermal power plant that adopts wet gypsum method (FGD device) for desulfurization and has flue gas heat exchanger (GGH) and demister at the same time often accumulates a large amount of sulfuric acid on the heat exchange surface of GGH and demister Calcium fouling, the existence of these foulings will greatly reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D1/72C11D3/37
Inventor 吴凡
Owner COUNTRY JIANGSU CATALYST REGENERATION TECH
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