Are you looking for ways to improve the life of your cement rotary kiln?
The destruction of a cement rotary kiln is usually due to the damage of the refractory material used in the cement rotary kiln, which in turn leads to the destruction of the cement rotary kiln.Fireramo summarizes common ways to improve the refractory material of a cement rotary kiln for you.
Rotary kiln kiln mouth shield to protect the kiln mouth cylinder from burning, abrasion, deformation, the effectiveness of the kiln mouth shield will cause damage to the kiln mouth cylinder, but also affect the service life of the kiln mouth refractory bricks or refractory castables. No matter what measures are taken, the service life of the kiln mouth part cannot be synchronized with other parts. Therefore, it is necessary to adopt the appropriate structure to reduce maintenance costs and improve the operation rate.
Many rotary kilns, generally after 2-3 years of operation to appear flared. Some cement rotary kilns become severely flared after one year of operation and must be replaced.
When replacing, we first need to cut down the old kiln mouth cylinder.
How to ensure that the verticality of the cut end face is very difficult, how to ensure concentricity and straightness in the re-welding is also not easy.
Therefore, many countries put the kiln mouth cylinder system into a separate section, with a flange and the kiln cantilever short cylinder bolted together. This is not only easy to replace, easy to find the right, but also will make the kiln mouth deformation is reduced, to improve the life of favorable.
The end of the kiln mouth cylinder extending into the kiln hood should be adapted to the shape of different forms of kiln mouth guards, but in order to avoid premature deformation, special strengthening measures should be taken.
If the end of the heat-resistant use of heat-resistant steel welding, although to improve the service life is favorable, but it is too much trouble. In short, the use of flange coupling of the kiln mouth cylinder is a structure worth advocating, should be vigorously promoted in the future design.
Rotary kiln kiln mouth guard must be expensive casting of high-quality heat-resistant steel. Therefore, the use of a reasonable shape of the kiln mouth guard to play the protective role of refractory castables, it is very significant.
Kiln mouth guard plate connection on the service life of the kiln mouth also has a great impact at home and abroad are now more heat-resistant steel bolts, often loosened and sheared accidents, replacement is very inconvenient.
With exempted pins and fixed is a simple and easy structure, heat-resistant steel pins and fixed forks can be used many times at will. Using the surface, the service life of the kiln mouth guard fixed with this structure is almost doubled. In addition, installation and dismantling are both easy and swift.
The Refractory castables can fully protect the kiln mouth shields, and the kiln mouth shields do not fail. The kiln mouth cylinder is well protected. Rotary kiln cylinder is not deformed, the kiln mouth shield has a solid fixed base, and thus is not easy to deform, in turn, will extend the life of refractory castables.
Kiln mouth guard plate from the kiln head end face, is composed of a circular shape by a number of fan-shaped. After being heated, it is bound to expand, and the temperature of the inner mouth is much higher than the outer flange. For this reason, in the design, manufacture and installation must leave enough radial expansion gap between two adjacent pieces. Otherwise, it is easy to shear off the coupling fixing bolts when working, so that the kiln mouth cylinder will soon become flared. Kiln mouth guard plate are castings, the size is difficult to control the preparation, so after the installation of the gap is often too large, no gap, gap inside the big outside small and inside the small outside big, local contact top dead and so on.
In the past, due to the harm of this phenomenon is not enough, in the event of such a situation is not dealt with, the result is that the kiln mouth life is very short. This situation should be dealt with in a timely manner, must be polished to ensure that the radial gap formed between the two adjacent kiln mouth guard plate is small enough to meet the design requirements of the gap. Excessive gaps can be filled with asbestos, rock wool and other things to ensure that there is no leakage of slurry when playing pouring material.
The reasonable control of the radial gap of the kiln mouth guard plate is very important, but in the past in the installation and maintenance often ignored this point. This is a very important reason for the premature failure of the kiln mouth guard, the kiln mouth cylinder quickly into a flared shape.
Specializing in refractory materials for over 20 years, we provide professional refractory solutions for the global high temperature industry.