Method and apparatus for removing dust particulates from preheated particulate material

摘要

A method for removing sulfur containing dust particles from particulate material exiting a material preheater in which the particulate material is heated by kiln off gases may include a number of steps. Off gases from the kiln are directed through a gas conduit to the preheater to preheat particulate material traveling through the preheater in a direction countercurrent to the direction of off gas flow through the preheater. Material exiting the preheater is directed to a material bypass conduit that is separated from the gas conduit and is flow connected to a material inlet to the kiln. A stripping gas is directed through the conduit to entrain dust particles in the preheated material and to carry said dust particles away from the preheated material.

主权项

1. A method for removing sulfur containing dust particles from particulate material exiting a material preheater in which the particulate material is heated by kiln off gases comprising:
directing off gases from a kiln through a gas conduit and into said preheater to preheat particulate material traveling through said preheater, the off gases from the kiln flow in a direction countercurrent to a direction of material flow through a material bypass conduit from said preheater; directing said preheated material exiting said preheater to the material bypass conduit separated from said gas conduit such that preheated material passing through the material bypass conduit does not come into contact with the off gases from the kiln passing through the gas conduit, the material bypass conduit connected to a material inlet to the kiln such that preheated material passed through the material bypass conduit is feedable to the kiln; directing a stripping gas through said material bypass conduit such that the stripping gas passes in a direction that is opposite a direction to which the preheated material particles that are larger than the dust particles pass through the material bypass conduit, said stripping gas being directed through the material bypass conduit such that the stripping gas travels at a velocity within the material bypass conduit that entrains the dust particles of the preheated material without preventing the material particles that are larger than dust particles from falling through the material bypass conduit toward the inlet of the kiln via gravitational force; and removing the stripping gas with the entrained dust particles from the material bypass conduit via at least one outlet so that neither are fed to the inlet of the kiln nor reenter the preheater.