The failure reasons of ramps area refractory materials
Persisting chamber design is too big, unreasonable structure, gravity destruction is bigger. Big volume chamber deposit though to stable control production, but increasing the weight of the refractory material. Persisting chamber volume up to 420 ms, now nearly 400 t, the total weight increased the ramps area support bracket bearing pressure. Make bracket force is too large, the longitudinal and lateral brick layer fracture.
Ramps area by cyclic gas wash and wear serious, mortar strength weakened, stripping. High velocity of gas in the surrounding, low center, there is an obvious phenomenon of stay. And the more serious, the closer the ramps speed the segregation of the cooling chamber to surrounding air currents to rise is the process of the gas collection from ramps discharge process, due to the structure of the ills, accelerated erosion. Ramps area is air duct, import and export coke, high circulation gas and refractory lining temperature along the chute to the continuous activity, especially the lower refractory masonry temperature fluctuations between 300 ~ 700 oc. The larger temperature difference can cause fire brick cracking and peeling. Ramps upper annular flue and export. Long cycle under repeated violent wash and wear on the gas and coke powder. Brick joints of refractory mortar are washed to the empty, seriously damaged the parts.
Chute bracket structure and brick type design is not reasonable. Ramps area partition wall on both sides of the no level of support, in the production of partition wall brick is prone to horizontal displacement, and carrying cutting width is only 200 mm, obviously too small. Bracket tilt Angle is too large, load support significantly weaker. "Groove" type is used by the brick. Although the partial occlusion effect, but accelerate the site cracks. From the current bracket damage. Brick juncture craze is "groove".
Chute bracket bearing stress point is not reasonable. 36 ramps nearly 400 t support bracket and the surrounding unbearable weight, concentric load brick layers caused by fracture. Masonry, the bearing stress point location is not reasonable, make bracket can't even force. Stress point forward will cause the cow leg 1 ~ 4 layer stress increase forward fracture; Stress ward will cause lower bracket 8-13th floor brick fracture, peeling off.
The strength of the refractory mortar bonding performance is poorer, the intensity is low. Now the oven temperature up to 800 ~ C, far below the refractory clay refractoriness under load 1 5 o0 ℃. Refractory clay hardening strength can not meet the requirements, cannot cohere. Intensity is reduced.
Repeatedly cooling for intensifying refractory heat and cold shrinkage. Accelerate damage. Refractory under cold contraction movement to center around. : for furnace cracking phenomenon is more prominent. Under the hot thermal expansion of the traction exacerbated the furnace refractory irregular displacement. Mud brick forming rupture, peeling off.