Apparatus for gas or liquid admixture

• US 4,416,548 A
• Filed: 02/17/1981
• Issued: 11/22/1983
• Est. Priority Date: 03/13/1980
• Status: Expired due to Term

• Current Assignee: Sunds Defibrator AB (Valmet Oyj)
• Original Assignee: Sunds Defibrator AB (Valmet Oyj)
• Inventors: Nasman, Lars E., Carre, Olof G., Zetterqvist, Stig B. H., Josefsson, Paul W.
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US06/234,786
• Time in Patent Office: 1,008 Days
• Field of Search: 366/303, 366/305, 366/307, 366/168, 366/176, 366/178, 366/262, 366/264, 366/315, 366/317, 241/46.06, 241/46.11, 241/162, 241/163
• US Class Current: 366/171.1
• CPC Class Codes: B01F 2025/911 Axial flow
• CPC Class Codes: B01F 27/272 with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
• CPC Class Codes: D21B 1/342 Mixing apparatus
• CPC Class Codes: D21C 9/10 Bleaching ; Apparatus therefor

Abstract

Methods and apparatus for continuously mixing fluid processing media with pulp suspensions are disclosed. The method includes supplying pulp suspensions to the central portion of the substantially planar radial face of a cylindrical rotor, feeding a fluid processing medium to the pulp suspension as it approaches the rotor face, forming an annular gap at the axial outer surface of the rotor, so that the rapid rotation of the rotor causes the pulp suspension and fluid processing medium to flow radially outward along the planar face and to pass axially through the annular gap, and effecting turbulence between the pulp suspension and the fluid processing medium at the entrance to that gap. The apparatus disclosed includes a cylindrical rotor having a substantially planar radial face and an axial outer surface, a housing surrounding the rotor including a pulp suspension inlet facing the center of the radial face of the rotor, and an outlet proximate to its axial outer surface, an annular gap between the axial outer surface and the housing along a predetermined portion of the axial outer surface of the rotor, a processing medium inlet for feeding the fluid processing medium to the pulp suspension inlet, and turbulence creating fingers located at the periphery of the substantially planar radial face of the rotor to create turbulence in the pulp suspension at the entrance to the annular gap.

Claims

1. Apparatus for continuously mixing a fluid processing medium with a pulp suspension comprising a cylindrical rotor including a planar radial face and a cylidrical axial outer surface, a housing surrounding said rotor, said housing including a pulp suspension inlet facing the center of said substantially planar radial face of said rotor and an outlet proximate to said cylindrical axial outer surface of said rotor, gap means for forming an annular gap between said cylindrical axial outer surface of said rotor and said housing along a predetermined portion of said cylindrical axial outer surface of said rotor, said planar radial face being free of mixing protrusions and allowing a substantially unimpeded flow of said pulp suspension to permit mixing of said pulp suspension at said gap means, processing medium inlet means for feeding said fluid processing medium to said pulp suspension inlet, and turbulence creating means located at the periphery of said planar radial face of said rotor so as to create turbulence in said pulp suspension at the entrance to said annular gap.

2. The apparatus of claim 1 wherein said gap means comprises an annular stator affixed to said housing.

3. The apparatus of claim 1 wherein said fluid processing medium inlet means feeds said fluid processing medium to the center of said planar radial face of said rotor.

4. The apparatus of claim 1 wherein said outlet of said housing is located tangentially with respect to said rotor and adjacent to the exit from said gap.

5. The apparatus of claim 1 wherein said housing includes a collecting space located axially on the side of said housing facing said planar radial face of said rotor, whereby material which is unable to pass through said gap may collect in said collecting space.

6. The apparatus of claim 1 including turbulence forming means located within said gap.

7. The apparatus of claim 6 wherein said turbulence forming means located within said gap is affixed to said cylindrical axial outer surface of said rotor.

8. The apparatus of claim 6 wherein said turbulence forming means located within said gap is affixed to said gap forming means.

9. The apparatus of claim 6 wherein said turbulence forming means located within said gap is affixed to both said cylindrical axial outer surface of said rotor and said gap forming means.

10. The apparatus of claim 1 wherein said rotor includes a plurality of said cylindrical axial outer surfaces and said gap forming means includes a plurality of gap forming members alternating with said plurality of cylindrical axial outer surfaces of said rotor so as to form a plurality of said gaps therein.

11. Apparatus for continuously mixing fluid processing medium with a pulp suspension comprising a cylindrical rotor including a planar radial face and a cylindrical axial outer surface, a housing surrounding said rotor, said housing including a pulp suspension inlet facing the center of said substantially planar radial face of said rotor and an outlet proximate to said cylindrical axial outer surface of said rotor, gap means for forming an annular gap between said cylindrical axial outer surface of said rotor and said housing along a predetermined portion of said cylindrical axial outer surface of said rotor, said annular gap having a height of between about 1 and 30 millimeters, and a length corresponding to said predetermined portion of said cylindrical axial outer surface of said rotor, said length being substantially less than the length of the cylindrical outer surface of said rotor, said planar radial face being free of mixing protrusions and allowing a substantially unimpeded flow of said pulp suspension to permit mixing of said pulp suspension at said gap means, processing medium inlet means for feeding said fluid processing medium to said pulp suspension inlet, and turbulance creating means located at the periphery of said planar radial face of said rotor so as to create turbulence in said pulp suspension at the entrance to said annular gap.

12. The apparatus of claim 11 wherein said height of said gap is between about 2 and 10 millimeters.

13. The apparatus of claim 11 wherein the height of said gap is between about 3 and 5 millimeters.

14. The apparatus of claim 11 wherein the length of said gap is between about 3 and 25 times the height of said gap.

15. The apparatus of claim 11 wherein the length of said gap is between about 5 and 20 times the height of said gap.

16. The apparatus of claim 11 wherein the length of said gap is between about 10 and 15 times the height of said gap.