A surface-active amine preservative for thermal power plant boiler shutdown protection

A technology of active amines and preservatives, applied in the field of surfactants, can solve the problems of being easily broken, difficult to recover and analyze, affecting the stable operation of polishing treatment, etc., and achieve the effect of effective protection.

A technology of active amines and preservatives, applied in the field of surfactants, can solve the problems of being easily broken, difficult to recover and analyze, affecting the stable operation of polishing treatment, etc., and achieve the effect of effective protection.

CN102296296AActive Publication Date: 2011-12-28XIAN THERMAL POWER RES INST CO LTD
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: every liter of surfactant amine preservative contains 1 mg of hydrazine, 200 μg of ethanolamine, 30 μg of hexamethylenetetramine, 3 mg of N-(2-aminoethyl) morpholine, 50 μg of pyrazine and 60 μg piperazine, ammonia water to adjust the pH value to 9.3, and the solvent of the surface active amine preservative is desalted water or deionized water. Low temperature test at 50°C. Put the test piece processed by the boiler water wall tube into the liquid phase and vapor phase of the deionized water containing the protective agent under the condition of 50°C for 2 hours to form a film at the same time. Take out the test piece and place it in a humid heat box together with the untreated test piece for 60 days. The corrosion rates of the test pieces are: 0.0023g / (m 2 h); Vapor-phase film-forming test piece 0.0031g / (m 2 h); untreated test piece 0.3608g / (m 2 h).

Embodiment 2

[0009] Embodiment 2: every liter of surface-active amine preservatives contains 4 mg of hydrazine, 380 μg of ethanolamine, 80 μg of hexamethylenetetramine, 9 mg of N-(2-aminoethyl) morpholine, 30 μg of pyrazine and 50 μg piperazine, ammonia water to adjust the pH value to 9.6, and the solvent of the surface active amine preservative is desalted water or deionized water. Medium temperature test at 150°C. Put the test piece processed by the boiler water wall tube into the autoclave, and under the condition of 150°C, film is formed simultaneously in the liquid phase and vapor phase of the deionized water containing the protective agent for 2 hours. Take out the test piece and place it in a humid heat box together with the untreated test piece for 60 days. The corrosion rates of the test pieces are: 0.0016g / (m 2 h); Vapor-phase film-forming test piece 0.0026g / (m 2 h); untreated test piece 0.3251g / (m 2 h).

Embodiment 3

[0010] Embodiment 3: every liter of surfactant amine preservative contains 2 mg of hydrazine, 260 μg of ethanolamine, 20 μg of hexamethylenetetramine, 7 mg of N-(2-aminoethyl) morpholine, 160 μg of pyrazine and 100 μg piperazine, ammonia water to adjust the pH value to 9.4, and the solvent of the surface active amine preservative is desalted water or deionized water. Medium temperature test at 250°C. The test piece processed by the boiler water wall tube is placed in an autoclave, and at 250°C, the film is formed simultaneously in the liquid phase and vapor phase of deionized water containing the protective agent for 2 hours. Take out the test piece and place it in a humid heat box together with the untreated test piece for 60 days. The corrosion rates of the test pieces are: 0.0011g / (m 2 h); Vapor-phase film-forming test piece 0.0015g / (m 2 h); untreated test piece 0.3417g / (m 2 h).

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Abstract

The invention relates to a surface active amine corrosion inhibitor for boiler shutdown protection in a heat-engine plant. Each litre of the surface active amine corrosion inhibitor contains 1-5mg of hydrazine, 100-500mu g of ethanolamine, 10-100mu g of hexamethylene tetramine, 1-10mg of N-(2-amino ethyl) morpholine, 20-200mu g of pyrazine and 50-500mu g of piperazine; ammonia water is used to regulate the pH value to 9.3-9.7; and the solvent of the surface active amine corrosion inhibitor is desalted water or deionized water. Compared with the prior art, the surface active amine corrosion inhibitor prepared according to the invention has good protection effect on a boiler and steam turbine high / low-temperature equipment during the shutdown period, and the negative effects that a samplingtube is blocked, resin precision processing performance can not be influenced, starting and flushing time is long, the corrosion inhibitor deposits on the surface of the low-temperature equipment fora long term and is slowly released and the like are not generated.

Description

technical field [0001] The invention relates to a surface active agent, in particular to a surface active amine preservative used for the outage protection of boilers in thermal power plants. It is mainly used for surface active amine anticorrosion treatment for supercritical and air-cooled unit boilers in power plants and steam turbine high / low temperature equipment shutdown protection for water vapor side. Background technique [0002] If the boilers in thermal power plants are not protected during shutdown, the boilers and steam turbine equipment will be corroded. When the boiler is started, it will affect the quality of the water-steam system, cause the deposition of corrosion products on the heating surface and affect the heat exchange efficiency of the unit, and even deposit on the blade surface of the steam turbine to reduce the output of the steam turbine, which greatly affects the safe and stable operation of thermal power plant equipment . Therefore, thermal powe...

Claims

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Application Information

Patent Timeline
28 Dec 2011
Publication
CN102296296A
IPC
C23F11/14
Inventors
邓宇强; 曹杰玉