What is the purpose of flushing the boiler pipe?

The purpose of boiler pipe flushing is to use the self-generated steam of boiler to flush away the rust, welding slag, iron filings, ash scale and oil scale and other impurities in the superheater, reheater heating surface pipe and steam pipeline, otherwise the following hazards will occur when supplying steam to the steam turbine:

(1) The high-speed steam flow carries sundries and impacts the turbine blades, forming a large number of pits, which will cause the blades to break in severe cases and cause major accidents.

(2) sundries remain in the superheater, which will reduce the flow area of the serpentine tube and even block it, resulting in overheating and explosion of the tube.

(3) Silicate impurities in the residue will seriously affect the steam quality.

Before pipe flushing, the boiler should have the conditions for formal start-up. Therefore, the boiler tube flushing is also the first complete start-up process of the boiler itself, which plays the role of testing the equipment, checking the equipment, and preliminarily mastering the operation characteristics of the equipment, laying the foundation for the smooth trial operation of the equipment.

The flushing process of the main steam system is to install a temporary gate valve at the outlet of the boiler steam header, which is discharged through the temporary exhaust pipe in front of the electric isolation door of the main steam system. The flushing pipe of the reheat steam system uses the first-stage bypass to charge steam to the reheat steam system, and its process is: main steam pipe → first-stage bypass → low-temperature reheater → high-temperature reheater → reheated steam outlet header → temporary exhaust pipe connected in front of the intermediate-pressure combined steam valve is discharged.

The above is the answer to what is the purpose of flushing the boiler pipe. ZOZEN is a professional manufacturer specializing in industrial boilers. We mainly produce steam boiler, hot water boiler and thermal oil heaters with various kinds of fuels. Welcome to get more details on the boilers via online customer service.