Cause analysis of high temperature corrosion breach of boiler membrane water

Cause analysis of high temperature corrosion breach of boiler membrane water
Macroscopic and low-power analysis

Two segments of water-cooled wall pipe with rupture leakage were analyzed, and three representative regions A, B and C were selected from the two segments for physical and chemical analysis. A zone is located in the water wall tube this breach of the leak, crevasse crack shaped transverse cracking, near the break there are many parallel to breach the transverse crack, broken mouth wall has no obvious plastic deformation, but has obviously thinning, in the crevasse tube wall surface has palm red oxide coating adhesion, and has the loss, broken mouth scour mark visible tube steam leaks.

B area water wall tube this surface has obvious transverse crack, and in the outside of the tube at that point, internal surfaces of transverse cracks can be seen, there will be a crack in the water wall tube this face opened longitudinally, visible on the wall, there are a lot of crack parallel distribution they or long or short by the outer wall of tube inward extension, the longest of which the crack open artificially, produced a crack fracture.

Cause analysis of high temperature corrosion breach of boiler membrane water

High temperature corrosion control measures for boiler membrane water wall

(1) adjust the flow distribution between pipe screens and reduce the temperature difference between adjacent pipe walls.

(2) appropriately raise the temperature of soot-blower medium to reduce thermal shock.

(3) improve the component structure of the stress concentration area.

(4) change the operating parameters to reduce the variation range of pressure and temperature gradient.

(5) heat expansion and cold contraction caused by intermittent operation shall be considered in the design.

(6) prevent the tube wall from overheating.

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