Mixing apparatus and arrangement for introducing a first liquid, a second liquid, and a third liquid into a process liquid flow which is flowing in a linear flow duct section

1. A mixing apparatus for introducing a first liquid, a second liquid, and a third liquid into a process liquid flow which is flowing in a linear flow duct section, wherein the mixing apparatus comprises:

a first liquid inlet conduit for feeding first liquid into the mixing apparatus,

a second liquid inlet conduit for feeding second liquid into the mixing apparatus,

a third liquid inlet conduit for feeding third liquid into the mixing apparatus, and

an outlet assembly configured to feed mixture of first liquid, second liquid, and third liquid from the mixing apparatus, wherein the outlet assembly of the mixing apparatus includes:

a pair of identical first outlet openings arranged symmetrically with respect to a center plane of the outlet assembly, wherein each first outlet opening is configured to feed mixture of first liquid, second liquid and third liquid from the mixing apparatus,

a second outlet opening arranged at said center plane, wherein said second outlet opening is configured to feed mixture of first liquid, second liquid and third liquid from the mixing apparatus,

a pair of identical third outlet openings arranged symmetrically with respect to said center plane and along said center plane of the outlet assembly between said pair of identical first outlet openings and said second outlet opening, wherein each third outlet opening is configured to feed mixture of first liquid, second liquid and third liquid from the mixing apparatus,

the third liquid inlet conduit being at a third downstream end of the third liquid inlet conduit in fluid connection with five outlet conduits of the outlet assembly, wherein each outlet conduit of the outlet assembly terminating in one of said first outlet openings, the second outlet opening, and said third outlet openings,

the first liquid inlet conduit has a first inlet opening at a first upstream end of the first liquid inlet conduit and a first downstream end,

the second liquid inlet conduit has a second inlet opening at a second upstream end of the second liquid inlet conduit and a second downstream end,

the third liquid inlet conduit has a third inlet opening at a third upstream end of the third liquid inlet conduit and a third downstream end,

the first liquid inlet conduit at the first downstream end of the first liquid inlet conduit open up inside the second liquid inlet conduit, and

the second liquid inlet conduit at the second downstream end of the second liquid inlet conduit open up inside the third liquid inlet conduit.

2. The mixing apparatus according to claim 1 , wherein the first outlet opening being a quadrilateral with rounded edges and arcuate sides in vertical section.

3. The mixing apparatus according to claim 1 , wherein the second outlet opening is kidney bean shaped in vertical section.

4. The mixing apparatus according to claim 1 , wherein the third outlet opening being a quadrilateral with rounded edges and arcuate sides in vertical section.

5. The mixing apparatus according to claim 1 , wherein the cross-section area of each third outlet opening of the pair of third outlet opening being larger than cross-section area of each first outlet opening of the pair of first outlet openings.

6. The mixing apparatus according to claim 1 , wherein the cross-section area of the second outlet opening being larger than the combined cross-section area of the third outlet openings of the pair of third outlet openings.

7. The mixing apparatus according to claim 1 , wherein the second liquid inlet conduit opening up inside the third liquid inlet conduit, and

the first liquid inlet conduit opening up inside the second liquid inlet conduit.

8. The mixing apparatus according to claim 7 , wherein the first cylindrical section between the first liquid inlet conduit opening and third liquid inlet conduit,

first apertures in the first cylindrical section between the first liquid inlet conduit and the second liquid inlet conduit,

a second cylindrical section between the third liquid inlet conduit and the second liquid inlet conduit, and

second apertures in the second cylindrical section between the second liquid inlet conduit and the third liquid inlet conduit.

9. The mixing apparatus according to claim 7 , wherein the first liquid inlet conduit comprises a third conduit section that is co-axial with a second conduit section of the second liquid inlet conduit, and

the second liquid inlet conduit comprises a first conduit section that is co-axial with a second conduit section of the third liquid inlet conduit.

10. The mixing apparatus according to claim 1 , wherein the outlet assembly comprises an arcuate end wall.

11. The mixing apparatus according to claim 1 , further comprising a first mounting flange.

12. The mixing apparatus according to claim 1 , wherein the second liquid inlet conduit being at least partly curved and having a circular cross-section.

13. The mixing apparatus according to claim 1 , wherein the third liquid inlet conduit being at least partly curved and having a circular cross-section.

14. The mixing apparatus according to claim 1 , wherein the first liquid inlet conduit being at least partly curved and having circular cross-section.

15. An arrangement for introducing a first liquid, a second liquid, and a third liquid into a process liquid flow which is flowing in a linear flow duct section having a circular section, wherein the arrangement comprising a mixing apparatus according to claim 1 that is in fluid communication with the linear flow duct section, wherein the outlet assembly of the mixing apparatus is configured to feed mixture of first liquid, second liquid, and third liquid from the mixing apparatus into the process liquid flow flowing in the linear flow duct section, wherein

first outlet opening in said pair of identical first outlet openings of the outlet assembly of the mixing apparatus is configured to feed mixture of first liquid, second liquid and third liquid from the mixing apparatus into the linear flow duct section substantially transversely to the process liquid flow,

the second outlet opening of the outlet assembly of the mixing apparatus is arranged upstream of the pair of said pair of identical first openings with respect to the process liquid flow in the linear flow duct section, wherein said second outlet opening is configured to feed mixture of first liquid, second liquid and third liquid from the mixing apparatus into the linear flow duct section substantially transversely to the process liquid flow, and

said pair of identical third outlet openings of the outlet assembly of the mixing apparatus are arranged between said pair of identical first outlet openings and said second outlet opening with respect to the process liquid flow in the linear flow duct section, wherein each third outlet opening of said pair of identical third outlet openings of the outlet assembly is configured to feed mixture of first liquid, second liquid and third liquid from the mixing apparatus into the linear flow duct section substantially transversely to the process liquid flow, and

the center plane of the outlet assembly of the mixing apparatus being coplanar with a flow duct center plane of the linear flow duct section.