Forced recirculation mixer

Patent metadata

Field	Value
Publication number	US-11293385-B2
Application number	US-202117195875-A
Country	US
Kind code	B2
Filing date	Mar 9, 2021
Priority date	Apr 29, 2020
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

The forced recirculation mixer (1) consists of a stirring enclosure (5) whose internal cavity forms a recirculation loop (6) in which circulates a homogeneous gas mixture (4) formed by a gas (3) to be mixed and a vaporizable liquid (2) respectively introduced into that loop (6) via a gas inlet duct (7) and a liquid injection nozzle (9), gas drawing-off means (12) being capable of withdrawing a homogeneous gas mixture (4) from the stirring enclosure (5) via a mixture draw-off duct (11) and a stirring turbine (13) driven by a turbine motor (28) forcing the homogeneous gas mixture (4) to circulate in the recirculation loop (6).

First claim

The invention claimed is:

1. A forced recirculation mixer ( 1 ) designed to mix at least one vaporizable liquid ( 2 ) with at least one gas ( 3 ) to be mixed so as to form a homogeneous gaseous mixture ( 4 ) characterized in that it comprises:
at least one stirring enclosure ( 5 ) whose internal cavity forms a recirculation loop ( 6 ) in which the homogeneous gaseous mixture ( 4 ) can circulate continuously, the beginning and the end of the recirculation loop ( 6 ) being combined;
at least one gas inlet duct ( 7 ) which emerges directly or indirectly into the stirring enclosure ( 5 ) and through which the gas ( 3 ) to be mixed is introduced into the recirculation loop ( 6 ) by means ( 8 ) for the introduction of gas in a known quantity;
at least one liquid injection nozzle ( 9 ) which emerges directly or indirectly into the stirring enclosure ( 5 ) to introduce the vaporizable liquid ( 2 ) into the recirculation loop ( 6 ), said nozzle ( 9 ) being fed by means ( 10 ) for introducing liquid in a controlled quantity, the vaporizable liquid ( 2 ) flow rate of which is controlled by a computer ( 45 ), said vaporizable liquid ( 2 ) forming, with the gas ( 3 ) to be mixed, the homogeneous gas mixture ( 4 );
at least one mixture draw-off duct ( 11 ) which emerges directly or indirectly into the stirring enclosure ( 5 ) and through which the homogeneous gas mixture ( 4 ) can be drawn-off from the recirculation loop ( 6 ) by gas drawing-off means ( 12 ); and
at least one stirring turbine ( 13 ) which is set in motion by a turbine motor ( 28 ) and which is positioned in the recirculation loop ( 6 ), said turbine ( 13 ) forcing the homogeneous gas mixture ( 4 ) to circulate in said loop ( 6 ).

2. The forced recirculation mixer of claim 1 , characterized in that the stirring enclosure ( 5 ) comprises of at least one external coaxial duct ( 14 ), each end of which is closed by a reversing terminating end ( 15 ), at least one internal coaxial duct ( 16 ) being accommodated in the external coaxial duct ( 14 ) and a gap being left for the homogeneous gas mixture ( 4 ) to circulate, on the one hand, between each reversing terminating end ( 15 ) and the internal coaxial duct ( 16 ) and, on the other hand, between the inner face of the external coaxial duct ( 14 ) and the outer face of the internal coaxial duct ( 16 ), the direction of circulation of the homogeneous gas mixture ( 4 ) in the external coaxial duct ( 14 ) being opposite to the direction of circulation of said mixture ( 4 ) in the internal coaxial duct ( 16 ).

3. The forced recirculation mixer of claim 2 , characterized in that the stirring turbine ( 13 ) is wholly or partly accommodated in one of the reversing terminating ends ( 15 ), the homogeneous gaseous mixture ( 4 ) being sucked through the center of said turbine ( 13 ) via the internal coaxial duct ( 16 ) before being discharged to the periphery of said turbine ( 13 ) via the gap left between the inner face of the external coaxial duct ( 14 ) and the outer face of the internal coaxial duct ( 16 ).

4. The forced recirculation mixer of claim 3 , characterized in that the reversing terminating end ( 15 ) which accommodates the stirring turbine ( 13 ) has a hollow hemi-toroidal shape, and blades ( 17 ) which comprises the stirring turbine ( 13 ) have a complementary protruding hemi-toroidal shape, a small play being left between said terminating end ( 15 ) and said blades ( 17 ).

5. The forced recirculation mixer of claim 2 , characterized in that the gas inlet duct ( 7 ) passes through one of the reversing terminating ends ( 15 ) to emerge into the internal coaxial duct ( 16 ).

6. The forced recirculation mixer of claim 5 , characterized in that the reversing terminating end ( 15 ) crossed by the gas inlet duct ( 7 ) has a hollow hemi-toroidal shape from which said duct ( 7 ) emerges.

7. The forced recirculation mixer in accordance with claim 5 , characterized in that the liquid injection nozzle ( 9 ) emerges into the interior of the gas inlet duct ( 7 ) or at the outlet thereof.

8. The forced recirculation mixer of claim 2 , characterized in that the internal coaxial duct ( 16 ) is held in position in the external coaxial duct ( 14 ) by at least one stirring vane ( 22 ) which radially connects said internal coaxial duct ( 16 ) to said external coaxial duct ( 14 ).

9. The forced recirculation mixer of claim 2 , characterized in that the external coaxial duct ( 14 ) or any of the reversing terminating ends ( 15 ) thereof is wholly or partly surrounded by a draw-off ring ( 23 ), the inside of the latter being connected to the inside of the external coaxial duct ( 14 ) by at least one radial draw-off orifice ( 24 ), the mixture draw-off duct ( 11 ) being connected to the stirring enclosure ( 5 ) by means of said ring ( 23 ) and said orifice ( 24 ).

10. The forced recirculation mixer of claim 1 , characterized in that the stirring enclosure ( 5 ) comprises heating or cooling means ( 25 ).

11. The forced recirculation mixer of claim 1 , characterized in that the turbine motor ( 28 ) is an electric motor ( 29 ) which comprises, on the one hand, a rotor ( 30 ) which rotationally connected to the stirring turbine ( 13 ) and which is enclosed in the stirring enclosure ( 5 ), and, on the other hand, a stator ( 31 ) which is placed outside said enclosure ( 5 ), magnetic fields produced by said stator ( 31 ) being capable to pass through the wall of the stirring enclosure ( 5 ) to cause the rotor ( 30 ) to rotate.

12. The forced recirculation mixer of claim 1 , characterized in that the means ( 10 ) for introducing liquid in a controlled quantity consist of a liquid piston pump ( 32 ) which comprises a pump casing ( 42 ), said pump ( 32 ) also comprising at least one single or double acting pump piston ( 33 ) which, by the action of a piston actuator ( 34 ) cooperating with displacement control means ( 44 ), is capable to move in translation in a pump cylinder ( 35 ) to form at least one pump chamber ( 36 ) of variable volume into which the vaporizable liquid can be introduced ( 2 ) via an inlet valve ( 37 ), and from which the liquid can be expelled ( 2 ) to the liquid injection nozzle ( 9 ) via a discharge valve ( 38 ).

13. The forced recirculation mixer of claim 12 , characterized in that the piston actuator ( 34 ) consists of a actuator rotary electric motor ( 39 ) secured to the pump casing ( 42 ), said motor ( 39 ) being capable to rotate in either direction to rotationally drive driving transmission means ( 40 ) which are integral in translation with the pump casing ( 42 ) and which cooperate with driven transmission means ( 41 ) which are integral in translation with the pump piston ( 33 ), said driving transmission means ( 40 ) reacting with said casing ( 42 ) to move longitudinally in translation said driven transmission means ( 41 ).

14. The forced recirculation mixer of claim 13 , characterized in that the driving transmission means ( 40 ) is formed by a worm ( 47 ) which rotates a worm wheel ( 43 ) which has a wheel thread ( 56 ), the driven transmission means ( 41 ) consisting of a piston thread ( 57 ) that cooperates with the wheel thread ( 56 ).

15. The forced recirculation mixer of claim 1 , characterized in that a gas mass flowmeter ( 46 ) directly or indirectly measures the mass flow rate of the gas ( 3 ) to be mixed circulating in the gas inlet duct ( 7 ) and/or the mass flow rate of the homogeneous gas mixture ( 4 ) circulating in the mixture draw-off duct ( 11 ).

16. The forced recirculation mixer of claim 1 , characterized in that the means ( 10 ) for introducing liquid in a controlled quantity consist of

Assignees

• Rabhi Vianney

Inventors

• Rabhi Vianney

Classifications

• F02M59/466

  Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means · CPC title

• F02M51/04

  Pumps peculiar thereto · CPC title

• F02M53/02

  with fuel-heating means, e.g. for vaporising · CPC title

• F02M59/366

  Valves being actuated electrically · CPC title

• F02M29/02 Primary

  having rotary parts {, e.g. fan wheels} · CPC title