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

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 in particular relates to a protection method suitable for super-long-term shutdown of a large thermal power generating set for more than one year. Background technique [0002] When the generator set of a thermal power plant is out of service for maintenance or in a standby state, if no protective measures are taken, the water vapor system will be corroded, resulting in prolonged start-up time of the equipment and increased 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 out-of-service protection methods mainly include wet protection and dry protection. Among them, wet protection includes ammonia water method, ammonia-hydrazine method, film-forming amine method, steam pressure method and water supply pressure method. Dry pr...

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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 corrosion occurred after more than three months for the second time, the protective effect of film-forming amine decreased gradually, and the protection of the furnace body The effect is not good. It can be seen that the single film-forming amine protection method is not suitable for the ultra-long-term outage protection of thermal power unit equipment. At present, there is still no ready-made outage protection method and experience for units that have been out of service for more than one year in China.