Protection method of super-long-period shut-down thermal generator set

A technology for thermal power generating units and boilers, which is applied in the directions of drying solid materials, drying solid materials without heating, lighting and heating equipment, etc. The protection effect of the furnace body is not good, etc., to achieve the effect of wide film-forming protection range, shortening the qualified time, and good film-forming effect

Active Publication Date: 2012-07-04
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above methods are suitable for ultra-long-term outage maintenance of generator sets for more than one year. For example, the 2×600MW subcritical unit project of Qiandong Thermal Power Plant in Guizhou, China, was out of service for more than 2 years from October 6, 2008 after trial operation. , using the film-forming amine corrosion inhibitor method for maintenance for many times, the internal corrosion was found to be serious after half a year for the first time, and corrosi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] 1. Take 10kg of octadecylamine into the pulverizer and pulverize into octadecylamine particles with a particle size of ￠5mm; then put the obtained octadecylamine particles into the mixer, add 90kg of demineralized water, and stir evenly into 100kg with an octadecylamine concentration of 10% Octadecylamine emulsion is reserved;

[0020] 2. When the thermal power generating unit enters the coasting state, the steam temperature in the boiler is 280-450℃, and the pH value of the water in the boiler is 9.5-10.0, slowly add the stearylamine emulsion prepared in step 1 to the boiler The liquid is added within 0.5-2 hours. At the same time, the boiler feed water flow is controlled between 450-550t / h, and the concentration of octadecylamine in the boiler is maintained between 5-50mg / L using conventional methods. The above octadecylamine emulsion circulates with the water vapor in the boiler to form a protective film on the inner surface of the boiler and its pipes...

Example Embodiment

[0024] Example 2

[0025] 1. Take 20kg of octadecylamine into the pulverizer and pulverize into octadecylamine particles with a particle size of ￠15mm; then put the obtained octadecylamine particles into the mixer, add 180kg of demineralized water, and stir evenly into 200kg with a concentration of octadecylamine of 10% Octadecylamine emulsion is reserved;

[0026] Step two is the same as embodiment 1;

[0027] 3. Add 1000kg of demineralized water into the condensate make-up tank of the above boiler, then add 0.8kg of 25% ammonia water and 0.9kg of 40% hydrazine. Then, using a conventional method, adjust the hydrazine content in the condensate water make-up tank to 300 mg / L, adjust the pH value of the demineralized water in the condensate water make-up tank to 10.5, and stir uniformly to obtain 1001.7 kg of ammonia-hydrazine protective liquid ;

[0028] Step four is the same as embodiment 1;

[0029] 5. Use conventional methods to clean the accumulated water, sediment and rust in the...

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Abstract

The invention discloses a protection method of a super-long-period shut-down thermal generator set, which comprises the following steps: 1. preparing an octadecylamine emulsion; 2. adding the octadecylamine emulsion; 3. preparing an ammonia-diammonium protection solution; 4. adding the ammonia-diammonium protection solution; and 5. putting silica gel, inspecting and treating the color change and replacing the colloid every 7-10 days, and determining the change of the inspection period. The method has the advantages of favorable film-forming effect and wide film-forming protection range; the thermal generator set is maintained sectionally, so the effect is better; the method is suitable for the maintenance of the thermal generator set which has been continuously shut down for more than half a year to one year; the invention greatly shortens the vapor quality qualification time when starting the thermal generator set, saves abundant water and coal, and has obvious economic benefit; and the invention does not need to greatly reconstruct the original pipeline, and therefore, has the advantages of simple technique, easy operation and high safety.

Description

Technical field [0001] The invention belongs to the technical field of metal anticorrosion, and specifically relates to a protection method suitable for super long-term shutdown of a large thermal generator set for more than one year. Background technique [0002] When the generator set of a thermal power plant is out of service or in a standby state, if protective measures are not taken, the water vapor system will be corroded, which will lead to a prolonged start-up time of the equipment and an increase in sewage discharge, thereby reducing the efficiency of the unit, or even causing the furnace tube to burst , Endangering the safe operation of the unit and causing huge economic losses. [0003] The existing deactivation protection methods mainly include wet protection and dry protection. Among them, the wet protection method includes ammonia water method, ammonia-hydrazine method, film forming amine method, steam pressure method and feed water pressure method. Dry protection m...

Claims

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Application Information

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IPC IPC(8): C23F11/02C23F11/00F26B5/16
Inventor 郭新茹张玉福冯斌何铁祥俆松
Owner STATE GRID HUNAN ELECTRIC POWER
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