A joint deactivation protection method for air-cooled island and unit

Abstract

The invention discloses a protection method for joint stop of an air cooling island and a unit. The method comprises the following steps of: 1) adjusting parameters before the air cooling unit is stopped; 2) injecting maintenance solution; 3) stopping the unit; and 4) draining. The method has the advantages that: octadecylamine is vaporized at the temperature of more than 450 DEG C, the gaseous octadecylamine enters a unit thermodynamic system and an air cooling system along with steam together to form a layer of hydrophobic protective film on the metal surface, and air is isolated from the metal after the unit is stopped, so that air is prevented from oxidizing and corroding the metal surface in relatively damp environment, a great amount of water is not required to be used for rinsing asystem in the process of restarting the unit, the qualification time of iron content in circulating water during starting is effectively shortened, and the using amount of fuel oil or fuel coal is saved during starting.

Description

technical field [0001] The invention relates to an air-cooling island and a unit deactivation method, in particular to a combined deactivation protection method of the air-cooling island and the unit. Background technique [0002] There are two main ways to cool the steam discharged from the steam turbine in the thermal power plant and recover its condensed water, namely water cooling (water cooling) and air cooling (air cooling). Most of the existing thermal power plants use water-cooling technology. Due to the evaporation loss of water vapor, a large amount of water needs to be consumed. With the development of the economy, water resources are increasingly scarce, and the price of water is rising year by year, which directly leads to an increase in the cost of thermal power plants. At the same time, water vapor The environmental problems caused by pollution are becoming more and more prominent. Therefore, the traditional water-cooling technology has become less and less s...

AI Technical Summary

Problems solved by technology

At present, there is no mature technology and research on the outage maintenance of direct air-cooled units and air-cooled islands in China, which cannot solve the corrosion during the outage of air-cooled islands; the iron content of the units cannot be qualified for a long time when the units are started, and a large amount of washing water is wasted; Unit start-up time, wasting a lot of fuel

There are technical problems such as poor solubility of chemicals, uneven distribution of vapor and liquid phases, and poor maintenance effect in traditional unit outage maintenance methods.

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