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Chemical for cleaning boiler, using method and cleaning device thereof

A boiler cleaning and medicament technology, which is applied in the coating process of metal materials, etc., can solve the problems of boiler safety operation, easy to cause acid corrosion, and unstable performance, etc., and achieve the effects of excellent passivation effect, low toxicity, and easy source

Inactive Publication Date: 2012-04-18
CHANGSHA BLUECLEAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic Shaanxi Chemical Design Institute uses pyrazolone drug by-product FAA colloid to make SH-405 citric acid pickling corrosion inhibitor, the performance is not stable enough, and the shelf life is short
Hydrochloric acid has a strong ability to dissolve iron oxides, but the corrosion inhibitors used for hydrochloric acid pickling require different corrosion inhibitors under different circumstances, which brings inconvenience to field application
[0005] The chemical cleaning and passivation process recommended by the widely used power industry standard "Guidelines for Chemical Cleaning of Boilers in Thermal Power Plants" (DL / T794-2001) generally has high passivation temperature, high energy consumption, long time, and even some passivation agents It is a carcinogen itself, and the environmental protection problem is prominent; especially the phosphate residue caused by the passivation of phosphate and polyphosphate is easy to cause acid corrosion, which will undoubtedly bring hidden dangers to the safe operation of the boiler in the future

Method used

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  • Chemical for cleaning boiler, using method and cleaning device thereof
  • Chemical for cleaning boiler, using method and cleaning device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The medicament used for boiler cleaning in this embodiment includes corrosion-inhibiting pickling agent, rinsing agent and passivating agent; the corrosion-inhibiting pickling agent is composed of the following mass percentage components: 1,3,5, 7 Tetraazaadamantane 0.25%, ethylenediaminetetraacetic acid 0.2%, hydrochloric acid 5.0%, phosphoric acid 2.0%, fluosilicic acid 2.5%, hydrazine hydrate 0.1%, sodium silicate 0.08%, hexadecyldimethylbenzyl ammonium chloride 0.1%, ammonium thiocyanate 0.08%, sodium dodecylbenzene sulfonate 0.1%, and the balance is water; the rinse agent is a citric acid solution with a mass percentage of 0.1% to 0.2%. Or analytically pure ammonia water to adjust the pH value to 4; the passivating agent is composed of the following components in mass percentage: ethylenediamine 0.045%, formaldehyde 0.04%, diammonium hydrogen phosphate 0.05%, hydrogen peroxide 0.6%, nitrous acid Sodium 0.04%, the balance is water; adjust the pH value of the solutio...

Embodiment 2

[0077] The medicament used for boiler cleaning in this embodiment includes corrosion-inhibiting pickling agent, rinsing agent and passivating agent; the corrosion-inhibiting pickling agent is composed of the following mass percentage components: 1,3,5, 7 Tetraazaadamantane 0.3%, ethylenediaminetetraacetic acid 0.1%, hydrochloric acid 3.0%, phosphoric acid 3.0%, fluosilicic acid 2.0%, hydrazine hydrate 0.15%, sodium silicate 0.1%, hexadecyldimethylbenzyl 0.2% ammonium chloride, 0.06% ammonium thiocyanate, 0.12% sodium dodecylbenzenesulfonate, and the balance is water; Or analytically pure ammonia to adjust the pH value to 4; the passivator consists of the following components in mass percentage: 0.05% ethylenediamine, 0.05% formaldehyde, 0.06% diammonium hydrogen phosphate, 0.7% hydrogen peroxide, nitrous acid Sodium 0.02%, the balance is water; adjust the pH value of the solution to 8.5-9.0 with an appropriate amount of ammonia water.

[0078] The supporting cleaning device o...

Embodiment 3

[0081] The medicament used for boiler cleaning in this embodiment includes corrosion-inhibiting pickling agent, rinsing agent and passivating agent; the corrosion-inhibiting pickling agent is composed of the following mass percentage components: 1,3,5, 7 Tetraazaadamantane 0.35%, ethylenediaminetetraacetic acid 0.15%, hydrochloric acid 8.0%, phosphoric acid 5.0%, fluorosilicic acid 2.0%, hydrazine hydrate 0.12%, sodium silicate 0.05%, hexadecyldimethylbenzyl 0.15% ammonium chloride, 0.08% ammonium thiocyanate, 0.15% sodium dodecylbenzenesulfonate, and the balance is water; the rinse agent is a citric acid solution with a mass percentage of 0.1% to 0.2%. Or analytically pure ammonia water to adjust the pH value to 4; the passivator consists of the following components in mass percentage: ethylenediamine 0.04%, formaldehyde 0.06%, diammonium hydrogen phosphate 0.03%, hydrogen peroxide 0.65%, nitrous acid Sodium 0.03%, the balance is water; adjust the pH value of the solution to ...

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Abstract

The invention relates to a chemical for cleaning a boiler, a using method and a cleaning device thereof, and belongs to the technical field of the chemical cleaning of equipment. A corrosion-inhibiting acid-washing agent comprises acid liquor, 1,3,5,7-tetraaza-adamantane, hydrazine hydrate, silicic acid, cetyl dimethyl benzyl ammonium chloride, ammonium thiocyanate and the like; a bleaching agent is citric acid solution; and a passivant consists of hydrogen peroxide and other additives. The cleaning device consists of a cleaning circulating pump, a cleaning fluid processing tank, a water injection pump and a water replenishing tank; and a plurality of ultrasonic energy converters are arranged on the outer surface of the cleaning fluid processing tank uniformly. The using method comprises the following steps of: establishing a cleaning pump station, testing under the pressure, cleaning scale deposits, bleaching the boiler and a system, passivating and performing water washing. The chemical has a simple process, is low in cost, energy-saving and environment-friendly, and avoids sour corrosion to the boiler.

Description

technical field [0001] The invention relates to chemical cleaning of equipment, in particular to a chemical agent for cleaning a boiler, a use method thereof and a cleaning device. Background technique [0002] In daily industrial production, boiler water is continuously circulated and concentrated during use, and the mineral content in the water will continue to increase, which will cause scaling and oxygen corrosion on the furnace wall and fire tube. Once scale is formed on the fire tube of the furnace wall, the heat exchange efficiency will be greatly reduced, and the boiler will accelerate oxygen corrosion. 3+ , Fe 2+ state, while Fe 3+ , Fe 2+ , Fe, OH - The electrochemical corrosion between ions is more serious. If things go on like this, the service life of the boiler will be shortened and the safe production will be endangered. Therefore, the furnace wall fire tube of the boiler must be treated regularly. Common types of scale include carbonate scale, sulfate s...

Claims

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Application Information

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IPC IPC(8): C23G1/04C23G3/00
CPCC23C22/60C23C22/62C23G1/088
Inventor 刘金山
Owner CHANGSHA BLUECLEAN TECH
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