Apparatus for purifying dust loaded waste gases

Claim 1

A coaxially arranged two-stage separator apparatus for purifying waste gases of furnaces, which includes: pre-separator means with the lower portion thereof forming a funnel-shaped dust collecting chamber, feeding pipe means extending into said pre-separator means for feeding waste gas into said pre-separator means, twist producing guiding means arranged in said feeding pipe means at that end portion thereof which extends into said pre-separator means to impart a circulatory movement upon the waste gases leaving said feeding pipe means, housing means substantially coaxially arranged with and in radially outwardly spaced relationship to said preseparator means so as to surround said pre-separator means and define an annular chamber therewith, the lower portion of said housing means forming a fine dust collecting chamber and the upper portion of said housing means forming a purified gas collecting chamber, said purified gas collecting chamber comprising means adapted to be connected to a suction blower for withdrawing purified gas from said purified gas collecting chamber, a plurality of cyclones each having a cylindrical portion in substantially abutting relationship to an adjoining cylindrical portion above a conical lower portion thereof and arranged closely in parallel with regard to each other and distributed in said annular chamber around said pre-separator means and having axial inlet means for communication with said pre-separator means and also having first outlet means leading into said fine dust collecting chamber, said cyclones furthermore having second outlet means communicating with said purified gas collecting chamber means, first radially extending wall means between said pre-separator means and said housing means and supporting particularly the conical lower portions respectively of said cyclones, said radially extending wall means having passages therethrough communicating with said first outlet means of said cyclones and said fine dust collecting chamber, said purified gas collecting chamber means including second wall means extending radially outwardly of said feeding pipe means in vertically spaced relationship to said first radially extending wall means and interconnecting said feeding pipe means and said housing means, and immersing pipe means forming the second outlet means of said cyclones and connected to said second radially extending wall means and opening into said purified gas collecting chamber means.