Apparatus and Method for Introducing a First Fluid into the Flow Path of a Second Fluid and Use of Such an Apparatus

• US 20140326323A1
• Filed: 09/09/2011
• Published: 11/06/2014
• Est. Priority Date: 09/10/2010
• Status: Active Grant

• Current Assignee: Andritz Aktiebolag Co.
• Original Assignee: Ovivo Luxembourg S r l
• Inventors: Jansson, Ulf, Bjrkstrm, Janos
• Granted Patent: US 9,427,716 B2
• Time in Patent Office: Days
• US Class Current: 137/8
• CPC Class Codes: B01F 2215/04 Technical information in relation with mixing
• CPC Class Codes: B01F 25/314 wherein additional components are introduced at the circumference of the conduit
• CPC Class Codes: B01F 25/4311 the baffles being adjustable
• CPC Class Codes: B01F 35/2211 Amount of delivered fluid during a period
• CPC Class Codes: B01F 35/833 Flow control by valves, e.g. opening intermittently
• CPC Class Codes: D21C 9/00 After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere polysaccharides, derivatives thereof C08B; paper-making D21B - D21H
• CPC Class Codes: D21C 9/001 Modification of pulp properties purification D21C9/08
• CPC Class Codes: Y10T 137/0357 For producing uniform flow
• CPC Class Codes: Y10T 137/7898 Pivoted valves
• CPC Class Codes: Y10T 137/87619 With selectively operated flow control means in inlet
• CPC Class Codes: Y10T 137/87643 With condition responsive valve
• CPC Class Codes: Y10T 137/87652 With means to promote mixing or combining of plural fluids

Abstract

An apparatus for mixing a first fluid into a flow path (44) of a second fluid, said apparatus having a chamber (12), which encloses the flow path and exhibits a first inlet (13) for receiving the second fluid, a second inlet (15) arranged downstream of the first inlet for receiving the first fluid, as well as an outlet arranged downstream of the second inlet for discharging a mixture of the first fluid and the second fluid, said flow path extending from the first inlet to the outlet and said second inlet opening into the flow path, a throttle body (29), which is pivotally arranged inside the chamber for controlling the flow area of the flow path, and pivoting means (50, 51) for pivoting the throttle body for said controlling of the flow area. According to the invention, the pivoting means is adapted to pivot the throttle body so that the flow area decreases with a decreasing flow rate of the second fluid and increases with an increasing flow rate of the second fluid, in order to maintain the flow velocity of the second fluid at the second inlet within a predetermined range.

Claims

1. An apparatus for mixing a first fluid into a flow path of a second fluid, said apparatus comprising:

a chamber, which encloses the flow path and exhibits a first inlet for receiving the second fluid, a second inlet arranged downstream of the first inlet for receiving the first fluid, as well as an outlet arranged downstream of the second inlet for discharging a mixture of the first fluid and the second fluid, said flow path extending from the first inlet to the outlet and said second inlet opening into the flow path,

a throttle body, which is pivotally arranged inside the chamber for controlling the flow area of the flow path; and

pivoting means, for pivoting the throttle body for said controlling of the flow area, the pivoting means is being adapted to pivot the throttle body so that the flow area decreases with a decreasing flow rate of the second fluid and increases with an increasing flow rate of the second fluid, in order to maintain the flow velocity of the second fluid at the second inlet within a predetermined range.

2. The apparatus according to claim 1, the pivoting means being adapted to continuously exert a first torque on the throttle body, which balances a second torque exerted by the second fluid on the throttle body at every flow rate of the second fluid, wherein the throttle body is adapted to adjust itself around an equilibrium position, which is a function of the flow rate of the second fluid.

3. The apparatus according to claim 2, the throttle body exhibiting a surface for diverting the direction of flow of the flow path, with which surface the flowing second fluid is adapted to interact to produce said first torque.

4. The apparatus according to claim 1 wherein the throttle body is disposed at, or immediately upstream of, the second inlet.

5. The apparatus according to claim 1 wherein the throttle body comprises a flap, which has a first end that is pivotally arranged at the chamber and a second end that is free.

6. The apparatus according to claim 5, the first end being pivotally arranged, via an axle, at a base portion of the chamber.

7. The apparatus according to claim 6, the second end being arranged substantially aligned with the second inlet.

8. The apparatus according to claim 6, wherein the apparatus comprises at least one compressively loaded lever arm arranged on the axle.

9. The apparatus according to claim 8, the pivoting means comprising a pneumatic cylinder, which is adapted to produce the compressive load on the lever arm.

10. The apparatus according to claim 1, wherein the apparatus comprises a second conduit, which connects to the outlet on the downstream side of the outlet, wherein the cross-sectional area of the second conduit is at least 50% larger than the cross-sectional area of the outlet.

11. The apparatus according to claim 1, wherein the throttle body exhibits turbulence-generating means, which are adapted to promote the formation of turbulence in the second fluid when it leaves the throttle body.

12. The apparatus according to claim 11, wherein the throttle body comprises a flap, which has a first end that is pivotally arranged at the chamber and a second end that is free, said turbulence-generating means having the shape of elongated, parallel grooves or recesses, which are disposed at the second end of the flap and extend in the longitudinal direction of the flap.

13. The apparatus according to claim 1, wherein the apparatus is adapted for mixing steam into a pulp suspension.

14. The apparatus according to claim 1, wherein the apparatus is adapted for mixing a process chemical into a pulp suspension.

15. A method for mixing a first fluid into a flow path of a second fluid, comprising the steps of:

causing the second fluid to flow in a chamber from a first inlet to an outlet, said chamber enclosing said flow path;

supplying the first fluid to the flow path of the second fluid via a second inlet of the chamber, said second inlet being arranged downstream of the first inlet and upstream of the outlet; and

causing pivoting means to pivot a throttle body, arranged in the flow path, to control the flow area of the flow path,

the pivoting means being caused to pivot the throttle body so that the flow area decreases with a decreasing flow rate of the second fluid and increases with an increasing flow rate of the second fluid, in order to maintain the flow velocity of the second fluid at the second inlet within a predetermined range.

16. The method according to claim 15, the pivoting means being caused to continuously exert a first torque on the throttle body, which balances a second torque exerted by the second fluid on the throttle body at every flow rate of the second fluid, wherein the throttle body is caused to adjust itself around an equilibrium position, which is a function of the flow rate of the second fluid.