Washing method of power station boiler temperature reducing water system and washing pipeline connection structure

Abstract

The invention discloses a washing method of a power station boiler temperature reducing water system and a washing pipeline connection structure. The washing method and the structure comprise a power station boiler temperature reducing water system. The method includes first increasing a temporary communication pipe on the power station boiler temperature reducing water system. The temporary communication pipe is located between two motor-driven doors connecting a temperature reducing water connection tank and a temperature reducing water pipeline of a temperature reducer. After the temporary communication pipe is connected, the washing steps comprise first way water washing, second way water washing and third way steam back washing. The washing method and the structure ensure that all temperature reducing water systems can be washed by a simple temporary system and the operation mode and ensure washing flow quantity and washing effect due to the fact that the inner diameter of a temporary pipe is larger than the inner diameter of the temperature reducing water pipeline.

Description

technical field [0001] The invention discloses a flushing method and a flushing pipeline connection structure of a boiler desuperheating water system in a power station, and belongs to the technical field of water flushing and steam flushing of a power station boiler. Background technique [0002] Because there will be a lot of sundries and rust in the pipelines of power plant boilers during the manufacturing, transportation and installation process, the sundries and rust must be removed by chemical cleaning, desalinated water flushing or steam flushing according to the pipeline type before the unit is assembled and started. remove. The desuperheating water system of the utility boiler cannot be chemically cleaned after installation due to system layout problems, and the desalted water or steam flushing the desuperheating water system cannot be discharged into the desuperheater (6), otherwise a large amount of debris will enter The superheater system affects the safety of t...

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Problems solved by technology

[0004] The two commonly used flushing methods mentioned above have been found to have great disadvantages in previous applications. The first method cannot flush the desuperheater 6. The structure of the desuperheater is relatively complicated, and the desuperheating water nozzle is porous. Therefore, the desuperheater There are many residues left over from the manufacturing and processing of the boiler. If the desuperheating water system is not properly washed, these debris will enter the high-temperature heating surface of the boiler one after another, which will bring hidden dangers to the safe operation of the unit.

Although Method 2 solves the problem of Method 1 and flushes all desuperheating water systems, it has the problems of poor flushing effect and high flushing cost; the reasons are: 1. The desalinated water or steam discharged by flushing are both It is discharged to the ditch through the drain pipe of the desuperheating water header, and the inner diameter of the drain pipe of the desuperheating water header is only 16-24mm, which is much smaller than the inner diameter of the desuperheating water pipe (generally 45-80mm), so that the flushing flow is severely restricted, resulting in the failure of flushing Insufficient momentum, many deposits cannot be washed out from the desuperheating water system

2. The steam flows back from the desuperheater 6 to the desuperheating water header 3, and finally the steam passes through the drainage pipe 8 of the desuperheating water header to the ditch. increase coal consumption

[0005] If the desuperheating water system cannot be rinsed clean, after the desuperheating water system is officially put into operation, debris will enter the high-temperature heating surface of the boiler or the steam turbine, resulting in deterioration of steam quality, and in severe cases, it will cause the overheating of the high-temperature heating surface of the boiler to burst the tube or the blade of the steam turbine damage, resulting in millions of dollars in economic losses

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