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Bolier water wall anti corrosion and wear resistant coating
Power plant boiler heating surface of metal wear/corrosion mechanism
1) Due to the circulating fluidized bed (CFB) boiler furnace characteristics, operation system, process requirements, operation process and burning coal, etc a series of prominent characteristics, caused CFB boiler frequent appear wear/corrosion and detonation tube problems by be heated. If do not take any measures, some parts will be deadly wear/corrosion. Pulverized coal furnace soot blower and around burner port water wall, superheater and economizer and other related parts, also can appear a similar wear process.
2) Due to the combustion chamber parts gas-solid two phase concentration, particle size, speed and direction of the different factors, the heating surface wear/corrosion different type, generally can be divided into two categories:
a. Erosion wear: air flow in a certain concentration of solid particles, and wear/corrosion by at a certain speed to impact to the surface. This kind of wear/corrosion should be limited to particle impact is bigger angle, tube surface was impact repeatedly by particle, caused plastic deformation, fatigue and deformation off.
b. Chip wear: during erosion wear, with smaller particle to impact to the heating surface, chamfer and plane the surface material, which in essence is a kind of abrasive wear/corrosion.
In fact, most of the water wall is chip wear, at engender the eddy current of the four corners and weld interface, pouring materials platform, etc parts, wear/corrosion pattern more complicated, including erosion, chip and fatigue wear integrated process.
Erosion wear can describe and the relationship between the related factors by following formula
E=MpKF(α)Vpn
E: Erosion wear weight
Mp: Erosion medium weight
Vp: Particle impact speed
K and n: It is related to material physical properties, “n “ value is related to the particle diameter, usually
between 3 and 4.
F(α): It is related to impact Angle related function correlation coefficient
From the above, it is known that wear/corrosion and particle velocity relation is the largest, the second is particle concentration.
Practice shows that the combustion chamber corners and refractory interface have raised parts, if do not take wear/corrosion measures, it will wear/corrosion too bad, the measured data is 5 μ m/h, and in china usually running 1000 hours will occur water wall detonation tube. Pulverized coal furnace chamber have sootblower to purge ash, in water wall and superheater purging area, because the air entrainment/flow have solid particle erosion, also will appear the similar wear/corrosion with CFB heating metal surface.
3) The coating wear/corrosion pattern
In fact, different wear/corrosion mechanism on the coating requirements are different. The wear/corrosion-resisting performance of the coating related to coating structure, hardness, toughness, composition, density, hard phase density and distribution etc factors.
Wear/corrosion resistant methods choice
About the power plant boiler heating surface metal wear/corrosion problem, people have adopted a series of measures, including furnace type design, operation system and all kinds of surface strengthening and protection. At the furnace type and operation system fixed premise, metal surface wear/corrosion-resisting reinforcement and protection, is the dominant direction of to prolong the working life.
So far, a various reinforcement and protection countermeasures include deposition layer, protective sleeve, guide plate, wear/corrosion-resistant tiles, wear/corrosion-resistant coating, spray welding and surfacing welding, etc method
Undoubtedly, in many method, thermal spraying technology is to provide wear/corrosion-resisting coating the most effective one, it has achieved good results and continue to rapid development over the world. In china, it has many years history, and gradually be accepted in power plant.
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