A Method for Eliminating Air Locks in W-Shape and U-Shape Pipelines

Abstract

The invention discloses a method for eliminating air plugs in W-shaped and U-shaped pipelines. Temporary valves are used to isolate and seal both ends of the pipeline; 2. Set up air extraction holes and inflation holes on the temporary pipelines at both ends of the isolation and sealing section of the W-shaped and U-shaped pipelines, and connect them to the vacuum pump and the inflation gas source; 3. Use the vacuum pump to control the W Vacuumize the isolation and sealing section of the type and U-type pipes, continue to pump air and flush the soluble gas X, and repeat the operation until the pipe section is completely replaced by the filled soluble gas X, and then turn off the gas source; 4. Turn on the W-type and U-type The temporary valve at one end of the W-shaped pipeline slowly enters the aqueous solution, and the filled soluble gas can be completely dissolved in the solution, and no new gas is generated; it eliminates the problem of gas blockage in the early stage of chemical cleaning of W-shaped and U-shaped pipelines, and provides a good solution for subsequent chemical cleaning. The smooth progress of cleaning, the cleaning effect and the normal start-up operation of the power station provide a guarantee.

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...

AI Technical Summary

Problems solved by technology

[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 chemical cleaning of W-shaped and U-shaped pipelines, it will be more complicated to take dredging measures in the later stage and it is not easy to dredge;

[0005] 3) Air locks are generated during the water supply process, which causes some pipes to be blocked during the chemical cleaning process, resulting in pipe bursts when starting the machine