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Octadecylamine corrosion inhibition formula for furnace shutdown protection of thermal power plant

A technology of shutdown protection and octadecylamine, which is applied in the field of octadecylamine corrosion inhibition formula, can solve the problems of difficult maintenance and short maintenance time, and achieve the effects of saving time, preventing corrosion and improving efficiency

Inactive Publication Date: 2010-08-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The octadecylamine corrosion inhibition formula for thermal power plant shutdown protection using the above technical scheme not only solves the problem of short maintenance time of traditional dry protection, but also solves the problem that wet protection is not easy to overhaul; the present invention is not only suitable for high parameter Once-through boilers are also suitable for high-parameter drum boilers, and the boilers will not pollute the boilers after restarting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] High temperature static experiment at 300°C. After the boiler water wall tube test piece was tested in the autoclave at 300°C for 8 hours, the result of the acidic copper sulfate acid drop test was: the color of the test piece on the steam side did not change from blue to red for two hours (generally, Acidic copper sulfate is dropped on the test piece, and the color change from blue to red does not occur in 7 seconds, indicating that the film of the test piece is very corrosion-resistant), and the test piece of the liquid side test turns red in 20 minutes; the result of the water drop test is: After dripping water on the test piece of the side test, the water drop formed into a ball, and the effect was very good; the test piece of the liquid side test formed a ball well and was easy to roll. The results of the acid drop test show that the film-forming effect of the test piece is good, and it is very corrosion-resistant; the results of the water drop test show that the f...

Embodiment 2

[0016] High temperature dynamic experiment at 320°C. Under the conditions of temperature of 320°C and pressure of 11MPa, the flow rate of the water vapor mixture in the dynamic simulation pipe section is controlled to be 13L / h, and the constant temperature time is six hours. Finally, the piece taken out is relatively uniform gray-black, with some blue bright surface in the middle, the water drop test is very good, the acid drop test is better, but slightly inferior to the static test at 300 ° C; in the hot and humid box, it takes 75 days to start Corrosion spots appear. These results show that: under such conditions, the effect of forming an octadecylamine adsorption film on the test piece is good; at the same time, there is another outstanding point of this scheme: the effect of the test piece is much better than that of the static state, and the corrosion will start after 75 days.

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Abstract

The invention discloses an octadecylamine corrosion inhibition formula for furnace shutdown protection of a thermal power plant. The formula mainly comprises octadecane amine, acetone oxime and ascorbic acid; the concentration ranges thereof are respectively controlled to be 20-250mu g / L, 60-150mu g / L and 15-100mu g / L; and the glacial acetic acid is taken as cosolvent of octadecylamine and the ammonia is taken as the pH value regulator. The preparation method of the formula comprises the following steps of: firstly adding the octadecane amine; diluting with the ionized water; adding the acetone oxime and the ascorbic acid; completely dissolving the corrosion inhibitor by means of heating, stirring and adding the glacial acetic acid; adding corrosion inhibitor solution into water vapour systems when the furnace is shutdown and lifted down in a sliding way, so that the solution is evenly distributed and fully filled into all the water vapour systems of the furnace; and generating an octadecylamine protection film with a monomolecular layer through the afterheat of the furnace before a heat furnace of the furnace discharges water, wherein the generated protection film can play a part in good protection at the water side of the heating surface of the furnace for 5 months. The method not only is suitable for a high-parameter DC furnace, but also is suitable for a high-parameter steam pocket furnace, can effectively protect the shutdown furnace, can be convenient for workers to overhaul the furnace, solves the disadvantage that the conventional method is short in protection time and is not suitable for overhaul, and can not pollute the furnace after being turned on again. The invention has obvious economic benefit, environmental benefit and social benefit, can not generate harmful substance, and has no secondary pollution.

Description

technical field [0001] The invention relates to an octadecylamine corrosion inhibitor formula for boiler shutdown protection in thermal power plants, in particular to a compounding scheme of n-octadecylamine corrosion inhibitors for high-parameter thermal power plant boiler shutdown protection. Background technique [0002] At present, the oxygen corrosion during the shutdown period of the boiler is the shutdown corrosion. It not only directly causes damage to the thermal equipment and reduces the service life of the equipment, but also the products of the shutdown oxygen corrosion enter the boiler with the feed water and will deposit on the heating surface, causing boiler Corrosion damage to other parts of the body, resulting in more serious consequences. The decisive conditions for boiler shutdown corrosion are oxygen and water vapor, and their existence will lead to corrosion on the surface of the tube wall. Since this kind of corrosion is at normal temperature or non-hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
Inventor 不公告发明人
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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