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Complex organic acid descaling and cleaning agent and application thereof

A cleaning agent and organic acid technology, applied in the field of composite organic acid descaling cleaning agents, to achieve the effect of promoting peeling and dissolving, good ability to peel off scale layer and dissolving scale layer, and prevent pipeline blockage

Inactive Publication Date: 2019-09-17
湖南省湘电试验研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, to provide a cleaning agent with strong cleaning ability, good ability to peel off and dissolve the scale layer, and can peel off the scale layer with firm adsorption and dense structure from the metal surface. , During the cleaning process, there will be no problems such as insoluble iron slag or iron precipitation, which can eliminate the risk of pipeline blockage during cleaning, and will not cause intergranular corrosion. Compound organic acid descaling cleaning agent

Method used

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  • Complex organic acid descaling and cleaning agent and application thereof
  • Complex organic acid descaling and cleaning agent and application thereof
  • Complex organic acid descaling and cleaning agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 5kg of technical grade glycolic acid solution (70% by mass), and 1.875kg of technical grade formic acid solution (80% by mass), and pour them into a container with a volume of 150L. Use a glass cup to slowly inject 91.7L of desalinated water, and continuously stir the solution while injecting desalinated water to promote the miscibility of acid and water. Weigh food-grade citric acid solids (in C 6 h 8 o 7 Total) 1kg and 0.5kg of acetylacetone are dissolved in the glycolic acid+formic acid solution, and the solid is fully dissolved by stirring continuously. The acid solution after uniform mixing is the ternary compound organic acid cleaning agent of the present invention.

Embodiment 2

[0025] Clean the scaled tube samples of the supercritical boiler with compound organic acid descaling cleaning agent and common cleaning agent respectively. The cleaning temperature is 85°C and the cleaning time is 6 hours. The concentration of each cleaning agent is as follows:

[0026] 1. No. cleaning agent: for the compound organic acid descaling cleaning agent of embodiment 1 preparation: 3.5% glycolic acid+1.5% formic acid+1% citric acid (with C 6 h 8 o 7 Total) + 0.5% acetylacetone co-solvent.

[0027] No. ② cleaning agent: citric acid: concentration 6%, add ammonia water to adjust pH to 3.7±0.2; specific preparation method is: weigh 6kg (in C 6 h 8 o 7 Meter) solid food-grade citric acid, dissolved in 94L of demineralized water, and slowly stirred with a glass rod to promote the dissolution of citric acid. Stop adding ammonia water at 0.2, and the cleaning agent No. ② is prepared.

[0028] ③No. cleaning agent: glycolic acid+formic acid: 3.5% glycolic acid+1.5% for...

Embodiment 3

[0037] Add the iron scale scraped off from the boiler tube wall to the cleaning solution after cleaning in Example 2, until the cleaning solution appears iron slag insoluble or precipitated out, measure the concentration of iron ions in the cleaning solution at this time, this concentration is each cleaning solution The limit concentration of the agent to dissolve iron scale, the results are shown in Table 2. It can be seen from the results that the scale dissolution limit of the compound organic acid descaling cleaning agent exceeds 14000mg / L, and the scale dissolution ability is obviously stronger than the other six other cleaning agents.

[0038] Table 2 Comparison of scale dissolution limit concentration of various cleaning agents

[0039]

[0040]

[0041] Carry out metallographic detection to the boiler pipeline after cleaning with composite organic acid descaling cleaning agent in embodiment 2, metallographic photo is as follows figure 1 shown. It can be seen fr...

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Abstract

The invention discloses a complex organic acid descaling and cleaning agent. The complex organic acid descaling and cleaning agent comprises glycolic acid, formic acid, citric acid and organic cosolvent acetylacetone. The complex organic acid descaling and cleaning agent has the advantages of high cleaning capability and high scale layer stripping and dissolving capability and can be applied to cleaning boiler scale, a scale layer which is firmly adsorbed and is of a compact structure can be stripped from a metal surface, the problems of insolubilization of iron slag or iron precipitation and the like cannot occur in a cleaning process, the risk of pipeline blockage during cleaning can be avoided, and intergranular corrosion cannot be caused.

Description

technical field [0001] The invention belongs to the field of chemical cleaning of boilers in thermal power plants, and in particular relates to a composite organic acid descaling cleaning agent and its application. Background technique [0002] After long-term operation of boilers in thermal power plants, serious corrosion and scaling will occur on the inner walls of equipment and pipelines. The accumulation of scale will lead to a decrease in the heat transfer efficiency of the pipeline, an increase in the resistance of water vapor along the way, an increase in the coal consumption of the boiler, and a reduction in energy utilization, which is not conducive to the energy saving and emission reduction of the unit. At the same time, boiler fouling can also lead to pipe overheating or even pipe burst, causing unit safety accidents. For this reason, thermal power generating units need to take chemical cleaning for boiler descaling every certain number of years or when the scal...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23F15/00
CPCC23F15/005C23G1/088
Inventor 查方林刘凯冯兵陶莉袁新民王凌
Owner 湖南省湘电试验研究院有限公司
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