How to renovate the kiln tail chute of rotary kiln? -Henan Red Star


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How to renovate the kiln tail chute of rotary kiln?

The kiln tail chute of rotary kiln directly introduces the material ball on the grate bed of grate Rotary kiln The key part of the system is composed of chute seat and chute. The kiln tail chute is easy to break during the operation of the kiln. In order to reduce this kind of occurrence, it is necessary to renovate it.

 Rotary kiln

Before the renovation of the kiln tail chute, it is necessary to understand the reasons for its fracture

1) There are casting defects at the fracture of the original chute, and the bending resistance and oxidation resistance of the material are poor;

2) The strength of the chute bend is poor and the stress concentration is obvious;

3) The pouring material on the chute is too thick and the heat dissipation is not good;

4) The size is too large and too long, and the deformation is large at high temperature;

5) The temperature of kiln tail is high, and the lower part of chute is exposed in high temperature environment.

Renovation of kiln tail chute

1) In order to improve the anti-oxidation ability, the material of kiln tail chute should be changed properly.

2) Changing the relative relationship between the chute and the chute seat, changing the chute seat into a structure with a slope (the width of the chute is unchanged, the length of the chute is increased, and the cantilever length of the chute is reduced as far as possible), and the bending of the chute (changing the chute into a straight one) can improve the stress of the chute.

3) In order to improve the bending capacity of the chute, the chute should be changed to be shorter and smaller to improve its bending resistance (the chute is changed from 2 to 3 chutes, and the middle one is slightly larger, even if there is a gap between the chutes, the leakage can be reduced).

4) By changing the chute into a ventilation structure (using the original kiln tail cooling fan for ventilation cooling), reducing its own temperature can relatively improve its oxidation resistance and deformation resistance. In addition, it can also improve the bending capacity of the retort with ventilation. There are dry stop cracks in the tail of each chute, which can effectively prevent the cracks.

5) Reduce the thickness of the castable on the chute (just cover the upper rib plate of the chute) to reduce its operation heat load.

6) On the premise of meeting the process requirements, the kiln tail temperature can be appropriately reduced (this point has been achieved by ball mill closure).

Many measures have been taken into account to prevent the cracking, bending and deformation of the retort. The service life of the reformed chute is better than that of the original chute, and the site installation conditions are available. Therefore, it is feasible to update the chute at the kiln tail.

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