WO1999055451A1 - Mixed phase buff body flow diffuser - Google Patents

Mixed phase buff body flow diffuser Download PDF

Info

Publication number
WO1999055451A1
WO1999055451A1 PCT/US1999/009552 US9909552W WO9955451A1 WO 1999055451 A1 WO1999055451 A1 WO 1999055451A1 US 9909552 W US9909552 W US 9909552W WO 9955451 A1 WO9955451 A1 WO 9955451A1
Authority
WO
WIPO (PCT)
Prior art keywords
diffuser
restricted
conduit
axis
interior wall
Prior art date
Application number
PCT/US1999/009552
Other languages
French (fr)
Inventor
Marvin R. Mentzer
Original Assignee
Advanced Burner Technologies Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Advanced Burner Technologies Corporation filed Critical Advanced Burner Technologies Corporation
Priority to AU37795/99A priority Critical patent/AU3779599A/en
Publication of WO1999055451A1 publication Critical patent/WO1999055451A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4319—Tubular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431971—Mounted on the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices

Definitions

  • the present invention relates generally to process stream flow diffusers, and more particularly to a mixed phase flow diffuser. Description of the Related Art
  • Mixed phase steams include pneumatic-conveyed solids and liquids fed into a reactor, burner, boiler or other coating or abrasive blasting process.
  • Such multi-phase conveying processes are commonly non-homogeneous due to stream conduits that change direction through elbows, scrolls, pipe reducers, valves, etc. that cause centrifugal separation or impact separation of the respective phases of material in the stream. Roping and gravitational spinning can also occur.
  • devices such as anti-roping bars, riffle stream separation and re-entrainment, volutes, agitators, etc. are used that require energy inputs that are unrecoverable.
  • This present invention provides a mechanical device that dynamically, through the change in velocity-caused sheer planes, effectively produces a more homogenized mixed phase flow stream downstream from a non-homogenized phase concentrated stream.
  • the device is unique in that it does not rely on physical contact with mechanical surfaces of each phase in the stream to re-direct the phases into a re-distributed mixture. This effect is generated dynamically with the pressure differentials caused by sheer planes and dynamic recirculation zones at different velocities.
  • This differential pressure gradient is developed by inserting a pre-designed non-aerodynamic symmetrical device in a mixed phase flow path to produce a re-circulating flow disrupting the laminar flow characteristics.
  • the diffuser design is based on a proprietary calculation methodology based on the physical arrangement of the stream containment. This arrangement may be rectangular, conical, round, oval, multi-sided or annular in configuration.
  • the invention may be in a fixed position or made to travel in a determined path depending on the process requirements. Consecutive unique units may be used in series for some processes.
  • the invention may be molded, cast, spun or fabricated from any rigid or semi-rigid material suitable for the process environment. It may be added to or an integrally formed part of the process stream conduit in the shape necessary to generate the required velocity gradients.
  • the primary objective of the invention is to provide a downstream well- homogenized process flow stream.
  • An additional objective is to provide a mixed phase flow diffuser where the pressure recovery rate achieved by the conversion of velocity head back to pressure head after the re-entrainment diffusing process is completed downstream of the diffuser, wherein the net energy consumption of the process flow stream alteration is greatly reduced compared to other commonly known and used devices.
  • FIG. 1 is a perspective view of one embodiment of the mixed phase buff body flow diffuser of the present invention
  • FIG. 2 is a sectional perspective view illustrating the diffuser of FIG. 1 installed in a flow stream conduit;
  • FIG. 3 is a schematic view illustrating the fluid dynamics of a buff body in a flow stream
  • FIG. 4 is a sectional perspective view similar to FIG. 2, but illustrating an alternative embodiment of a diffuser not having co-axial symmetry.
  • FIGS. 1 and 2 show a mixed phase buff body flow diffuser 10 suitable for use in a flow stream conduit 30 having a circular cross-section.
  • the dimensions D, 1 , t, , t 2 , and w, and the angle ⁇ are a function of the application velocities, specific gravities of the mixed phase materials, velocity direction vectors, and cross-sectional shape of the flow stream conduit.
  • the diffuser 10 includes three restricted surfaces 12, 14, and 16 which are positioned at different distances from the geometric center 32 of the conduit 30.
  • the diffuser 10 is positioned within the conduit 30 downstream of the last impact separation point, such as an elbow, so that a homogenous stream is discharged, for example, into a burner.
  • the composition of the mixed phase stream will include a gaseous carrier in combination with a liquid and/or solid.
  • FIG. 2 illustrates segregated flow upstream of the diffuser 10, turbulent flow immediately downstream of the diffuser 10, and laminar homogenous flow further downstream. Materials of different phases that have separated in the conduit are thus mixed or homogenized by flowing through the diffuser 10.
  • FIG. 3 illustrates that the three restricted surfaces 12, 14 and 16 of the diffuser 10 causes the mixed phase stream to flow through the diffuser 10 at three distinct velocities thus creating three distinct pressures.
  • This illustrated model generates circumferential and radial internal dynamic recirculation zones. Sheer planes are developed between the velocity over surface 14 and surface 16 to produce a circumferential recirculation and between the velocities over surface 12 and 16 to produce radial recirculation. Material passing proximate the surface 12 closest to the geometric center 32 travels at the highest velocity and results in the lowest pressure since it is the most restricted. Material passing proximate the surface 14 travels at a lesser velocity, and material passing over surface 16 travels at the lowest velocity. The lowest pressure zone created at the center of the conduit 30 causes the materials in the stream to flow to the lowest pressure zone from the zones of higher pressure and effectively mix the materials into a laminar homogenous flow.
  • FIG. 4 illustrates a diffuser 110 having a departure from co-axial symmetry resulting in the generation of circumferential recirculation that will impart a net swirl to the mixed stream to suit downstream process requirements.
  • Angles ⁇ and Y produce net swirling recirculation.

Abstract

A mechanical device (10) has surfaces (12, 14, 16) which dynamically produces changes in velocity-caused sheer planes thereby effectively produces a more homogenized mixed phase flow stream downstream. The device is unique in that it does not rely on physical contact with mechanical surfaces of each phase in the stream to re-direct the phases into a re-distributed mixture. This effect is generated dynamically with the pressure differentials caused by sheer planes and dynamic recirculation zones at different velocities. This differential pressure gradient is developed by inserting a pre-designed non-aerodynamic symmetrical device (10) in a mixed phase flow path to produce a re-circulating flow disrupting the laminar flow characteristics. This arrangement may be rectangular, conical, round, oval, multi-sided or annular in configuration. The invention may be in a fixed position or made to travel in a predetermined path depending on the process requirements. Consecutive unique units may be used in series for some processes.

Description

MIXED PHASE BUFF BODY FLOW DIFFUSER BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates generally to process stream flow diffusers, and more particularly to a mixed phase flow diffuser. Description of the Related Art
Mixed phase steams include pneumatic-conveyed solids and liquids fed into a reactor, burner, boiler or other coating or abrasive blasting process. Such multi-phase conveying processes are commonly non-homogeneous due to stream conduits that change direction through elbows, scrolls, pipe reducers, valves, etc. that cause centrifugal separation or impact separation of the respective phases of material in the stream. Roping and gravitational spinning can also occur. To achieve re-homogenization of the stream, devices such as anti-roping bars, riffle stream separation and re-entrainment, volutes, agitators, etc. are used that require energy inputs that are unrecoverable.
Those concerned with these and other problems recognize the need for an improved mixed phase buff body flow diffuser. BRIEF SUMMARY OF THE INVENTION
This present invention provides a mechanical device that dynamically, through the change in velocity-caused sheer planes, effectively produces a more homogenized mixed phase flow stream downstream from a non-homogenized phase concentrated stream. The device is unique in that it does not rely on physical contact with mechanical surfaces of each phase in the stream to re-direct the phases into a re-distributed mixture. This effect is generated dynamically with the pressure differentials caused by sheer planes and dynamic recirculation zones at different velocities. This differential pressure gradient is developed by inserting a pre-designed non-aerodynamic symmetrical device in a mixed phase flow path to produce a re-circulating flow disrupting the laminar flow characteristics. The diffuser design is based on a proprietary calculation methodology based on the physical arrangement of the stream containment. This arrangement may be rectangular, conical, round, oval, multi-sided or annular in configuration. The invention may be in a fixed position or made to travel in a determined path depending on the process requirements. Consecutive unique units may be used in series for some processes.
The invention may be molded, cast, spun or fabricated from any rigid or semi-rigid material suitable for the process environment. It may be added to or an integrally formed part of the process stream conduit in the shape necessary to generate the required velocity gradients.
The primary objective of the invention is to provide a downstream well- homogenized process flow stream.
An additional objective is to provide a mixed phase flow diffuser where the pressure recovery rate achieved by the conversion of velocity head back to pressure head after the re-entrainment diffusing process is completed downstream of the diffuser, wherein the net energy consumption of the process flow stream alteration is greatly reduced compared to other commonly known and used devices. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
Other objects, advantages, and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings, wherein:
FIG. 1 is a perspective view of one embodiment of the mixed phase buff body flow diffuser of the present invention;
FIG. 2 is a sectional perspective view illustrating the diffuser of FIG. 1 installed in a flow stream conduit;
FIG. 3 is a schematic view illustrating the fluid dynamics of a buff body in a flow stream; and FIG. 4 is a sectional perspective view similar to FIG. 2, but illustrating an alternative embodiment of a diffuser not having co-axial symmetry. DETAILED DESCRIPTION OF THE INVENTON
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, FIGS. 1 and 2 show a mixed phase buff body flow diffuser 10 suitable for use in a flow stream conduit 30 having a circular cross-section. The dimensions D, 1 , t, , t2, and w, and the angle α are a function of the application velocities, specific gravities of the mixed phase materials, velocity direction vectors, and cross-sectional shape of the flow stream conduit.
The diffuser 10 includes three restricted surfaces 12, 14, and 16 which are positioned at different distances from the geometric center 32 of the conduit 30. The diffuser 10 is positioned within the conduit 30 downstream of the last impact separation point, such as an elbow, so that a homogenous stream is discharged, for example, into a burner. The composition of the mixed phase stream will include a gaseous carrier in combination with a liquid and/or solid.
FIG. 2 illustrates segregated flow upstream of the diffuser 10, turbulent flow immediately downstream of the diffuser 10, and laminar homogenous flow further downstream. Materials of different phases that have separated in the conduit are thus mixed or homogenized by flowing through the diffuser 10.
FIG. 3 illustrates that the three restricted surfaces 12, 14 and 16 of the diffuser 10 causes the mixed phase stream to flow through the diffuser 10 at three distinct velocities thus creating three distinct pressures. This illustrated model generates circumferential and radial internal dynamic recirculation zones. Sheer planes are developed between the velocity over surface 14 and surface 16 to produce a circumferential recirculation and between the velocities over surface 12 and 16 to produce radial recirculation. Material passing proximate the surface 12 closest to the geometric center 32 travels at the highest velocity and results in the lowest pressure since it is the most restricted. Material passing proximate the surface 14 travels at a lesser velocity, and material passing over surface 16 travels at the lowest velocity. The lowest pressure zone created at the center of the conduit 30 causes the materials in the stream to flow to the lowest pressure zone from the zones of higher pressure and effectively mix the materials into a laminar homogenous flow.
FIG. 4 illustrates a diffuser 110 having a departure from co-axial symmetry resulting in the generation of circumferential recirculation that will impart a net swirl to the mixed stream to suit downstream process requirements. Angles β and Y produce net swirling recirculation.
Although only an exemplary embodiment of the invention has been described in detail above, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the following claims.

Claims

CLAIMS:
1. A mixed phase flow diffuser for a flow stream conduit having an interior wall, and an axis disposed at the cross-sectional geometric center of the conduit, the diffuser comprising: a body having a central open area and including: a peripheral edge disposed coincident with the interior wall; a leading edge disposed perpendicular to the axis and extending inwardly from the interior wall; a following edge disposed perpendicular to the axis and extending inwardly from the interior wall and being spaced from the leading edge to define a body width; a first restricted surface disposed inward from the interior wall and parallel to the axis at a first distance from the geometric center, the first restricted surface extending across the width of the body; a second restricted surface disposed inward from the first restricted surface and parallel to the axis at a second distance from the geometric center, the second restricted surface extending across the width of the body; and a third restricted surface disposed parallel to the axis at a third average distance from the geometric center, the third restricted surface extending between the first and second restricted surfaces and across the width of the body.
2. The diffuser of claim 1, wherein the first, second and third restricted surfaces are disposed co-axially with the axis of the conduit.
3. The diffuser of claim 1, wherein the first, second and third restricted surfaces are angularly disposed with respect to the axis of the conduit.
4. The diffuser of claim 1, wherein a plurality of first, second and third restricted surfaces are symmetrically disposed around the interior wall of the conduit.
5. The diffuser of claim 2, wherein a plurality of first, second and third restricted surfaces are symmetrically disposed around the interior wall of the conduit.
6. The diffuser of claim 3, a plurality of first, second and third restricted surfaces are symmetrically disposed around the interior wall of the conduit.
PCT/US1999/009552 1998-04-29 1999-04-29 Mixed phase buff body flow diffuser WO1999055451A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37795/99A AU3779599A (en) 1998-04-29 1999-04-29 Mixed phase buff body flow diffuser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/069,254 1998-04-29
US09/069,254 US6042263A (en) 1998-04-29 1998-04-29 Mixed phase ruff body flow diffuser

Publications (1)

Publication Number Publication Date
WO1999055451A1 true WO1999055451A1 (en) 1999-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/009552 WO1999055451A1 (en) 1998-04-29 1999-04-29 Mixed phase buff body flow diffuser

Country Status (3)

Country Link
US (1) US6042263A (en)
AU (1) AU3779599A (en)
WO (1) WO1999055451A1 (en)

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GB2541050A (en) * 2015-04-02 2017-02-08 Hanovia Ltd Conditioning and treating a fluid flow
JP2018202364A (en) * 2017-06-09 2018-12-27 三菱航空機株式会社 Mixture promotion member and air conditioning system having the same

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US6394644B1 (en) * 1999-06-21 2002-05-28 Koch-Glitsch, Inc. Stacked static mixing elements
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CN115479275A (en) 2017-06-19 2022-12-16 塞拉斯热能技术有限责任公司 Baffle assembly for varying transitional flow effects between different chambers
US10883646B2 (en) * 2018-03-02 2021-01-05 Tracey Kennedy Pipe for pipeline infrastructures
US11845047B2 (en) * 2018-05-15 2023-12-19 Chevron Phillips Chemical Company Lp Systems and methods for improved mixing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JP2018202364A (en) * 2017-06-09 2018-12-27 三菱航空機株式会社 Mixture promotion member and air conditioning system having the same

Also Published As

Publication number Publication date
AU3779599A (en) 1999-11-16
US6042263A (en) 2000-03-28

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