Anti-wear structure of inner wall of circulating fluid bed reactor

Abstract

The anti-wear structure of the wall surface of the fluidized bed reactor disclosed by the present invention includes a laid refractory and wear-resistant layer and a metal wall surface. tower. When the anti-wear structure on the wall surface of the fluidized bed reactor is started to operate, the finer solid particles flowing downward along the metal wall surface will first fill up the concave platform, forming a thicker ash layer. When the ash layer is stable, when the particles flowing downward along the metal wall collide with the ash layer, the ash layer can better absorb the kinetic momentum of the particles and reduce the momentum after the particles change the flow direction, thereby effectively reducing the impact of the particles on the metal wall. scour wear. The structure is simple and easy to implement, and it can be used for anti-wear at the junction of the lower metal wall of the circulating fluidized bed reactor and the refractory and wear-resistant layer, and can also be used for anti-wear of metal parts that are washed on both sides in the reactor.

Description

technical field [0001] The invention relates to a circulating fluidized bed reactor, in particular to an anti-wear structure for the wall of the fluidized bed reactor. Background technique [0002] Circulating fluidized bed reactors have been widely used in energy, chemical and other fields, such as circulating fluidized bed boilers and circulating fluidized bed gasifiers that use solid fuel as raw material. Due to the special ring-nuclear gas-solid flow structure inside the circulating fluidized bed reactor, that is, solid particles flow upward in the center of the reactor, while in the wall area of ​​the reactor they flow downward along the wall, and the circular fluidization of the metal wall is provided. Bed reactors are prone to severe wear problems. In a typical circulating fluidized bed boiler furnace, severe wear usually occurs at the interface between the refractory and wear-resistant layer laying area in the lower part of the furnace and the metal water-cooled wal...

AI Technical Summary

Problems solved by technology

[0003] The "kick-out tube" structure proposed by the American Foster Wheeler company, such as figure 1 As shown, the junction point between the refractory and wear-resistant layer 1 and the metal water-cooled wall tube 2 is recessed outwards, and this structure prevents the particles flowing down along the metal water-cooled tube wall from washing to the junction of the refractory and wear-resistant layer and the metal water-cooled wall , and directly wash to the refractory and wear-resistant layer, so as to avoid the wear of the water wall, but this structure can only be applied to the anti-wear of metal parts that are washed by particles on one side, but not in reactors that are washed by particles on both sides Wear protection of suspended metal parts

[0004] At present, the interface between the metal wall surface and the refractory and wear-resistant layer at the lower part of the airfoil heating surface of the circulating fluidized bed boiler generally adopts the metal surfacing method to make the interface between the metal wall surface and the refractory and wear-resistant layer form a slope to prevent wear, but the anti-wear measures not very good

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