Long-period shutdown protection method for generator sets

Abstract

The invention discloses a long-period shutdown protection method for generator sets and belongs to the field of power generation facility protection. The method comprises the following steps: when the pressure of a boiler is reduced to 1.6 MPa, adding hydrazine (5-10 mg/L) into the boiler, and adding hydrazine (5-10 mg/L) into a once-through boiler; when the pressure of the boiler is reduced to 0.5 MPa, closing all drain valves, water discharge valves and air valves on the heating surface of the boiler, opening a nitrogen filling valve on the heating surface of the boiler and filling nitrogen into the boiler, and maintaining the pressure of the nitrogen within a range of 0.03-0.05 Mpa; when detecting that the purity of discharged nitrogen is greater than 98%, closing all the water discharge valves, and maintaining the pressure of the nitrogen within a range of 0.01-0.03 Mpa; and when the temperature of a cylinder wall is reduced to below 100 DEG C, continuously filling nitrogen into a gas turbine engine. According to the invention, various corrosions caused in the long-period shutdown process of a generator set can be effectively eliminated, the integral protection time of the generator set is prolonged, and the protection period can be more than one year.

Description

technical field [0001] The invention belongs to the field of protection of power generation facilities, and in particular relates to a long-period shutdown protection method for generating sets. Background technique [0002] After the boiler is out of service, a large amount of outside air will enter the boiler water system. At this time, although the boiler has discharged water, there is always a layer of water film attached to the metal surface of the boiler, and the oxygen in the air is dissolved in this water film, so that It is saturated, so it is easy to cause corrosion of dissolved oxygen, and its corrosion rate is generally much faster than that during operation. If there is salt scale that can dissolve in the water film on the metal surface of the boiler, it will be more corrosive. Practice has proved that most of the boilers with severe corrosion are formed during the shutdown period and developed during operation. Therefore, it is of great significance to adopt ...

AI Technical Summary

Problems solved by technology

At present, the ammonia-hydrazine protection method, ammonia method, residual heat drying method, and furnace drying method commonly used for boiler shutdown protection are all complicated in operation, long in preparation time, short in anti-corrosion time, and the anti-corrosion effect can only be achieved by starting the furnace. Defects such as inability to carry out process monitoring and other inspections