Method for eliminating W and U type pipeline air jam

Abstract

The invention discloses a method for eliminating W and U type pipeline air jam. The method comprises the steps that 1, the two ends of a system inlet and outlet pipe connected with a W and U type pipeline are connected with temporary pipelines respectively, and the two ends of the W and U type pipeline are isolated and sealed through temporary valves; 2, an air exhaust hole and an air inflation hole are formed in the temporary pipelines at the two ends of the isolation sealing segment of the W and U type pipeline, and are connected with a vacuum pump and an inflation source respectively; 3, the vacuum pump is adopted to carry out vacuumizing on the isolation sealing segment of the W and U type pipeline, air exhausting is continuously kept, soluble gas X is inflated, repeated operation is carried out, and the air source is closed until the interior of the isolation sealing segment of the W and U type pipeline is completely replaced by the inflated soluble gas X; and 4, the temporary valve at one end of the W and U type pipeline is opened, aqueous solutions slowly enter the pipeline, the inflated soluble gas can be completely dissolved in the solutions, and no new gas is generated. The problem that the air jam is generated in the earlier stage that the W and U type pipeline is chemically cleaned is solved, and the guarantee is provided for smooth operation of subsequent chemical cleaning, the cleaning effect and normal starting and running of a power station.

Description

technical field

[0001] The invention relates to the technical field of cleaning W-shaped and U-shaped pipelines, in particular to a method for eliminating air plugs in W-shaped and U-shaped pipelines. Background technique

[0002] After the W-shaped and U-shaped heat exchange pipes (such as superheaters, reheaters, etc.) have been running for a certain period of time, chemical cleaning is required to remove the scale (mainly iron oxides) generated on the heat exchange surface during operation to improve the performance of the boiler. Thermal efficiency and reduced risk of scaling. In the early stage of chemical cleaning of W-shaped and U-shaped pipelines, water is usually used for direct flushing. These methods have the following disadvantages:

[0003] 1) In the process of chemical cleaning of W-shaped and U-shaped pipes and direct water supply, air locks are easily formed in W-shaped and U-shaped pipes;

[0004] 2) If air locks are generated in the early stage of chemica...