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A method and an apparatus for mixing of two fluids. The fluid is caused to flow into a mixing chamber (1). The gas is preferably mixed with the fluid before flowing into the mixing chamber. The chamber is vertically oriented and has a mainly cylindrical shape with smooth interior walls. The fluid is

A method and an apparatus for mixing of two fluids. The fluid is caused to flow into a mixing chamber (1). The gas is preferably mixed with the fluid before flowing into the mixing chamber. The chamber is vertically oriented and has a mainly cylindrical shape with smooth interior walls. The fluid is led into the chamber via a nozzle (7) in such a way that the fluid flows into the chamber at high velocity. During operation a turbulent gas/liquid phase is formed in the upper part of the chamber and mainly a fluid phase is formed in the lower part of the chamber. The fluid phase with mixed-in gas is drawn off from an outlet (8) arranged at the bottom of the chamber. The mixer could be connected to a transport pipe for fluid.

대표청구항 ▼

The invention claimed is: 1. A method of mixing a fluid and a gas, the method comprising: injecting the gas into the fluid; feeding a flow of the fluid and gas into an upper part of a vertically oriented mixing chamber having mainly a cylindrical shape with smooth interior walls, wherein the fluid

The invention claimed is: 1. A method of mixing a fluid and a gas, the method comprising: injecting the gas into the fluid; feeding a flow of the fluid and gas into an upper part of a vertically oriented mixing chamber having mainly a cylindrical shape with smooth interior walls, wherein the fluid and gas are fed into the mixing chamber at a pressure of 1.5-10 bar by means of an inlet nozzle in such a way that the fluid and gas flow into the mixing chamber at high velocity and fill the mixing chamber, wherein the flow of the fluid and gas into the mixing chamber forms a turbulent gas/fluid phase with internal recirculation in the upper part of the mixing chamber and mainly a fluid phase in a lower part of the mixing chamber; maintaining the pressure in the mixing chamber at 1.35-9 bar to avoid essential pressure loss in the mixing chamber; and drawing off the fluid phase with dissolved gas from an outlet pipe arranged at a bottom of the mixing chamber, wherein the outlet pipe has an outlet nozzle and at least the outlet nozzle is submerged in fluid where the pressure is released. 2. The method according to claim 1, wherein the inlet nozzle is arranged in such a way that the fluid flows axially into the chamber. 3. The method according to claim 1, wherein the fluid is pumped from a pipeline or reservoir before being mixed with the gas, and the fluid phase with dissolved gas is supplied back into the pipeline or reservoir via the outlet nozzle. 4. The method according to claim 1, wherein the fluid and gas are supplied to the mixing chamber at a pressure of 2-4 bar. 5. The method according to claim 4, wherein the fluid and gas are supplied to the mixing chamber at a pressure of 3 bar. 6. The method according to claim 1, wherein the pressure in the mixing chamber is maintained at 1.8-3.6 bar. 7. The method according to claim 6, wherein the pressure in the mixing chamber is maintained at 2.7 bar. 8. The method according to claim 1, wherein the fluid is water and the gas is a dissolvable gas. 9. The method according to claim 8, wherein the water includes a salt, fibers or particles, and the gas is oxygen or carbon dioxide. 10. An apparatus for mixing and dissolving a gas into a fluid, the apparatus comprising: a pipeline or reservoir for containing a fluid; a pump connected to the pipeline or reservoir; a gas inlet for injecting gas into the fluid pumped by the pump from the pipeline or reservoir; a vertically-oriented mixing chamber having an inlet formed in an upper part of the mixing chamber, the inlet being connected to the pump for receiving fluid from the pipeline or reservoir, wherein the inlet comprises a nozzle for supplying the fluid containing gas to the mixing chamber at high velocity; and an outlet pipe arranged at a bottom of the mixing chamber for drawing off a fluid phase comprising dissolved gas from the mixing chamber, the outlet pipe being provided with an outlet nozzle disposed in the pipeline or reservoir for supplying the fluid with gas dissolved therein to fluid in the pipeline or reservoir. 11. An apparatus according to claim 10, further comprising a gas injector for supply gas to the fluid upstream of the mixing chamber. 12. An apparatus according to claim 10, wherein d1<d3<d2, where d1 is the diameter of the inlet, d2 is the diameter of the mixing chamber and d3 is the diameter of the outlet. 13. An apparatus according to claim 10, wherein the ratio L:d2 is within a range of 15:1 to 20:1, where L is the length of the mixing chamber and d2 is the diameter of the mixing chamber. 14. An apparatus for mixing and dissolving a gas into a fluid, the apparatus comprising: a mixing chamber that is vertically oriented and has a mainly cylindrical shape with smooth interior walls, the mixing chamber comprising an inlet for fluid and an inlet for gas, the inlet comprising a nozzle disposed in an upper part of the mixing chamber for supplying fluid containing gas to the mixing chamber at high velocity, wherein under operation a turbulent gas/liquid phase is formed in the upper part of the mixing chamber and mainly a fluid phase is formed in a lower part of the mixing chamber; and an outlet pipe arranged at an outlet formed in a bottom of the mixing chamber, wherein a fluid phase comprising mixed in gas can be drawn off from the mixing chamber through the outlet pipe, wherein d1<d3<d2, where d1 is the diameter of the inlet, d2 is the diameter of the mixing chamber and d3 is the diameter of the outlet. 15. An apparatus according to claim 14, wherein a ratio L:d2 is within a range of 15:1 to 20:1, where L is the length of the mixing chamber.