Innovation of radial graphite block sealing design of rotary kiln

The sealing principle of radial graphite block at the end of the kiln is to install a circle of graphite block on the end surface of the return hopper. The graphite block is close to the outer circle of the fixed sleeve and rotates around the fixed sleeve with the return hopper, so as to achieve the purpose of sealing the end of the kiln,see picture. Radial graphite block seal, good sealing effect, simple structure, the same working condition energy consumption is lower than the end surface sealing, maintenance is also convenient. However, if the installation is not in place, the process operation is not careful, and a large amount of ash leakage when opening and stopping the kiln, which will seriously affect the service life of the radial graphite block seal.

Picture：Radial graphite block sealing device

Radial graphite block sealing at the end of the kiln is also a use method, but due to design problems and installation problems, many kiln end of radial graphite block sealing rotary kilns are not successful, most of them use the end surface sealing. Through field investigation and research, we found the error of the radial graphite block seal design, redesigned the radial graphite block seal device, found the correct method of the installation of the fixed socket connected with the decomposition furnace, designed and manufactured the installation tire; and then found the outer circle and end of the dump Solution to the adverse effects of surface beating on radial graphite block sealing.

In 2019, it was used in the Φ4m×56m rotary kiln built by HX Cement Company, and first used in the rotary kiln of LSJ Cement Company in March 2022, which achieved satisfactory results. HS kiln has improved the fixed sleeve, the end of the sleeve is peeled and clean, reducing the friction coefficient with the graphite block. Install with special tires, and finally check that the beating volume of the outer sleeve to the center of the kiln is within the range of 13mm. The installation of the guide bracket eliminates the influence of the radial sealing of the kiln tail on the radial graphite block. When the graphite block rotates around the fixed sleeve, the maximum expansion capacity of the spring will not exceed 15mm, which meets the design requirements. If the process operator operates normally, does not leak ash or a small amount of ash when opening and stopping the kiln, and the temperature of the return hopper does not rise sharply, the practice of HX cement companies has proved that the service life of radial graphite block sealing is guaranteed.