EP1344011A1 - Dispositif pour insuffler des particules solides a grains fins dans un flux gazeux - Google Patents

Dispositif pour insuffler des particules solides a grains fins dans un flux gazeux

Info

Publication number
EP1344011A1
EP1344011A1 EP01271524A EP01271524A EP1344011A1 EP 1344011 A1 EP1344011 A1 EP 1344011A1 EP 01271524 A EP01271524 A EP 01271524A EP 01271524 A EP01271524 A EP 01271524A EP 1344011 A1 EP1344011 A1 EP 1344011A1
Authority
EP
European Patent Office
Prior art keywords
flow
annular gap
pneumatic
gas
solid particles
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01271524A
Other languages
German (de)
English (en)
Inventor
Yvon Kroemmer
Jean Lambert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP1344011A1 publication Critical patent/EP1344011A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B15/08—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B01J8/004—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor by means of a nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/16—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with particles being subjected to vibrations or pulsations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier

Definitions

  • the present invention relates to a device for blowing fine-grained solid particles into a gas stream.
  • fine-grained brown coal coke is blown into the exhaust gas stream extracted from the melting furnace in electrical steelworks.
  • the porous lignite coke particles adsorb pollutants contained in the exhaust gas stream. They are then separated from the exhaust gas flow in a filter system and can be disposed of relatively easily.
  • the lignite coke is blown into a gas extraction pipeline that can have a diameter of several meters. A laminar gas flow is present in this pipeline, with gas speeds of up to 100 km / h being achieved.
  • the quantities of brown coal coke that are blown in should of course be relatively small (in the order of magnitude, for example, 0.1-1 kg of brown coal coke per 1000 Nm 3 of exhaust gas), so that the filter system is not overloaded.
  • this requires the fine-grained lignite coke particles to be distributed as uniformly as possible over the entire pipe cross section.
  • Injection lances are known so far which blow the brown coal coke suspended in a carrier gas into the pipeline at several points, this being possible both in direct current and in cross current. It should first be noted here that a relatively complex distributor device is required to split an abrasive pneumatic delivery flow over several lances. It should also be emphasized that streaking of the injected brown coal coke in the laminar gas flow in the pipeline cannot be prevented. This means, among other things, that part of the gas does not come into contact with the blown brown coal coke at all. Object of the invention
  • the object of the present invention is therefore to propose a simple device for blowing fine-grained solid particles into a gas stream, which ensures a better distribution of the solid particles in the gas stream.
  • the device according to the invention comprises an annular gap through which the pneumatic delivery flow is blown in transversely to the gas flow.
  • This annular gap is arranged in the gas flow in such a way that the velocity vectors of the solid particles in the pneumatic flow at the outlet from the annular gap are essentially perpendicular to the velocity vectors in the gas stream and an overlaying of these velocity vectors results in an injection jet that widens in the direction of the gas stream. Due to this umbrella-shaped widening of the injection jet around the annular gap, this simple device enables a far better distribution of the solid particles in the gas stream than the known injection lances.
  • the annular gap has rotational symmetry, so that the distribution of the solid particles is also essentially rotationally symmetrical.
  • the annular gap in an angular sector can be interrupted or reduced in order to prevent or reduce the exit of the pneumatic flow in this angular sector, e.g. because internals in the gas flow must be protected in this angular sector.
  • the flow tube defined by the gas flow does not cut surface, it is usually possible to make do with a single annular gap, which is centered on the central flow line of the flow tube defined by the gas flow and generates an umbrella-shaped injection jet which covers the entire cross section of the flow tube at a certain distance from the annular gap.
  • the annular gap has a rotational symmetry, the axis of symmetry of which is identical to the central flow line.
  • a preferred embodiment comprises a central injection chamber which opens radially into the annular gap surrounding it, introduction means for axially introducing the pneumatic delivery flow into the injection chamber and redirection means for redirecting the axial pneumatic delivery flow into the radial annular gap.
  • the diverting means for diverting the axial pneumatic flow into the radial annular gap can e.g. be designed as a baffle.
  • the introduction means for the axial introduction of the pneumatic delivery flow into the central blowing chamber can have two axially opposite inlet openings for the pneumatic delivery flow.
  • the pneumatic flow is divided into two approximately equally strong partial flows, which flow axially from one another from the two opposite inlet openings, collide axially in the blowing chamber and thereby divert each other radially into the annular gap.
  • the distribution of the solid particles in the gas flow can be changed in a simple manner by means of a throttled secondary gas supply in the pneumatic feed flow or in the two pneumatic partial flows.
  • the scattering of the material particles can be pulsed by a device
  • the device comprises a first diversion body with a first outer edge and a second diversion body with a second outer edge; wherein the first and second diversion body axially opposite each other such that they form the blowing chamber and their outer edges form the annular gap.
  • the two diversion bodies are advantageously fastened in such a way that they have an adjustable axial distance, so that the width of the annular gap can be adjusted.
  • the two diversion bodies are preferably of shell-shaped design. However, they can also have the shape of hemispheres, for example.
  • the device comprises a distributor block for dividing the pneumatic flow into two partial flows.
  • a first pipe is connected to the distributor block and forms a delivery line for the first partial flow of the pneumatic delivery flow. It extends transversely to the gas flow and is extended by a first pipe socket which extends parallel to the gas flow and carries the first diversion body.
  • a second pipe is also connected to the distributor block and forms a delivery line for the second partial flow of the pneumatic delivery flow. It also extends transversely to the gas flow and is extended by a second pipe socket that extends parallel to the gas flow and carries the second diversion body.
  • Both tubes are advantageously arranged parallel to one another and connected to one another by an adjustable spacer. The latter makes it possible to adjust the axial distance between the two diversion bodies and thus to change the width of the annular gap.
  • An angle profile can be attached to the first and / or second pipe as protection against abrasion.
  • FIG. 1 a longitudinal section through a pipeline for a gas stream, with a device according to the invention for blowing fine-grained solid particles into the gas stream.
  • the in FIG. 1 is a circular cylindrical pipe of larger diameter. It is e.g. around the gas extraction pipeline of an electric furnace from a steel mill, which can have a diameter of several meters. A predominantly laminar gas flow is present in this pipeline, with gas speeds of up to 100 km / h being achieved. The direction of flow of the gas stream is indicated by arrow 12.
  • This reference numeral 12 is also used generally to designate the gas flow.
  • Reference numeral 11 designates the central axis of the pipeline 10, which is also the central flow line of the gas flow 12.
  • the gas stream 12 enclosed by the pipeline 10 is also referred to as a flow tube.
  • the reference numeral 14 designates a device according to the invention for blowing fine-grained solid particles into the gas stream 12.
  • the device shown is, in particular, finely ground brown coal coke (grain size less than 1 mm).
  • the injection quantities are relatively small (for example, 0.1-1 kg of lignite coke per 1000 Nm 3 of exhaust gas), so that an excellent distribution of the powdery lignite coke must be achieved over the entire pipe cross section.
  • the device 14 according to the invention is via a lateral tube extension
  • the fine-grained solid particles (in this case the ground lignite coke) are fed to it via a main connection line 18 in the form of a pneumatic conveying stream.
  • This main connection line 18 opens into a massive, abrasion-resistant distributor block 20, which divides the pneumatic delivery flow into two partial flows.
  • the first partial flow is introduced in the distribution block 20 into a first pipe 22, which extends radially to the central axis 11 of the pipe 10.
  • the second partial flow is introduced in the distributor block 20 into a second tube 24, which is parallel to the first Pipe 22 extends to the central axis 11 of the pipeline 10.
  • the first pipe 22 has a first pipe socket 26 which extends in the flow direction 12 coaxially to the central axis 11.
  • the second pipe 24 has a second pipe socket 28 which extends in the flow direction 12 coaxially to the central axis 11.
  • the first pipe socket 26 carries a first shell-shaped diverter body 30, and the second pipe socket 28 carries a second shell-shaped diverter body 32.
  • Both diverter bodies 30, 32 lie axially opposite one another in such a way that they form an injection chamber 34, their outer edges 36, 38 being one Form annular gap 40.
  • the latter has a rotational symmetry, the axis of symmetry of which is the central axis 11 of the circular cylindrical tube 10.
  • the two pipe sockets 26, 28 form two inlet openings 42, 44 in the blowing chamber 34, which are axially opposite one another on the central axis 11 and have essentially the same opening width.
  • the two pneumatic partial flows flow radially towards one another from the two inlet openings 42, 44 of the blowing chamber 34 and in the process divert each other radially in the direction of the annular gap 40.
  • the radial diversion due to an axial collision of the two partial flows naturally protects the two diversion bodies 30, 32, since they are exposed to much less abrasion wear.
  • the velocity vectors 46 of the solid particles at the exit from the annular gap 40 are essentially perpendicular to the velocity vectors 48 in the gas stream 12. The superimposition of these speed vectors 46, 48 then results in an injection jet 50 which widens in the form of a screen in the direction of the gas stream 12 and surrounds the annular gap 40.
  • the radial component of the velocity vector 49 of a solid particle progressively decreases due to the friction and pressure resistance in the transverse direction of the gas stream 12; while solid particles are progressively accelerated in the axial direction by the gas stream 12.
  • the dashed lines 52 show different flow paths of solid particles after they have left the annular gap 40. These current paths 52 are essentially perpendicular to the flow direction 12 at the exit of the annular gap 40 progressively in the direction of the flow direction 12 to finally become parallel to the flow direction 12.
  • the differences in the flow paths 52 are caused, for example, by the fact that the solid particles at the outlet of the annular gap 40 have different outlet speeds, for example due to different accelerations or speed losses in the blowing chamber 34.
  • the solid particles usually also have different shapes and sizes, which is also noticeable in the shape of the flow path 52 due to the friction and pressure resistance. It should also be noted that when flow flows around the diversion bodies 30, 32, turbulences also occur which are also reflected in different current paths 52. In conclusion, it should be noted that these different flow paths 52 are of course desirable because they contribute to better scattering of the solid particles in the laminar gas flow 12.
  • the distribution of solid particles in the laminar gas stream 12 can also be influenced by the width of the annular gap 40.
  • This width can be set in a very simple manner by means of an adjustable spacer 60 between the first tube 22 and the second tube 24.
  • This adjustable spacer 60 also makes it possible to adjust the annular gap 40 when the two outer edges 36, 38 wear. If the two tubes 22, 24 are not flexible enough to be able to adjust the width of the annular gap 40 via the adjustable spacer 60, e.g. the pipe socket 26, 28 can be made telescopically extendable.
  • the distribution of solid particles in the laminar gas stream 12 can also be carried out by diluting the pneumatic delivery stream with a gas.
  • the distributor block for example, has two throttled secondary gas feeds 70, 72, via which a diluent gas can be specifically fed into the first tube 22 or the second tube 24. If there is a negative pressure in the pipeline 10, there is usually no need to provide a pressurized gas supply.
  • the two throttled secondary gas supplies 70, 72 can then be designed as throttled, atmospheric suction lines.
  • the throughput can also be pulsed through the restrictable secondary gas supplies 70, 72, which can be done in a simple manner
  • a pulsating exit velocity can be achieved in the annular gap 40, which further improves the scattering of the solid particles in the laminar gas stream 12.
  • a device for pulsed throttling of the secondary gas supply can comprise, for example, an electromagnetically or pneumatically operated throttle valve with relatively short switching times.
  • the two throttled secondary gas supplies 70, 72 can be throttled synchronously or asynchronously.
  • Asynchronous throttling can result in a further improvement in the scattering of the solid particles in the laminar gas stream 12 in various cases.
  • the tubes 22, 24 it should be noted that these are advantageously by means of
  • Angle irons 80, 82 are protected against abrasion in the direction of flow.
  • the transition from the pipe 22 or 24 into the pipe socket 26 or 28 is protected by a pipe bag 84, 86.
  • This pipe sack 84, 86 fills up with solids, so that friction occurs from solids to solids in this transition region.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Nozzles (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un dispositif (14) pour insuffler des particules solides à grains fins dans un flux gazeux (12), ces particules solides à grains fins étant acheminées dans ledit dispositif (14) sous forme d'un flux de transport pneumatique. Ce dispositif (14) comprend un interstice annulaire (40) à travers lequel sort le flux de transport pneumatique dans le flux gazeux (12). Cet interstice annulaire (40) est disposé dans le flux gazeux (12) de telle sorte que les vecteurs de vitesse (46) des particules solides, à la sortie de l'interstice annulaire (40) sont sensiblement perpendiculaires aux vecteurs de vitesse (48) dans le flux gazeux (12). La superposition de ces vecteurs de vitesse (46, 48) permet de créer un jet d'insufflation (50) s'élargissant en forme d'éventail en direction du flux gazeux (12).
EP01271524A 2000-12-18 2001-11-13 Dispositif pour insuffler des particules solides a grains fins dans un flux gazeux Withdrawn EP1344011A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU90703A LU90703B1 (de) 2000-12-18 2000-12-18 Vorrichtung zum Einblasen von feinkoernigen Feststoffpartikeln in einen Gasstrom
LU90703 2000-12-18
PCT/EP2001/013102 WO2002050485A1 (fr) 2000-12-18 2001-11-13 Dispositif pour insuffler des particules solides a grains fins dans un flux gazeux

Publications (1)

Publication Number Publication Date
EP1344011A1 true EP1344011A1 (fr) 2003-09-17

Family

ID=19731956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01271524A Withdrawn EP1344011A1 (fr) 2000-12-18 2001-11-13 Dispositif pour insuffler des particules solides a grains fins dans un flux gazeux

Country Status (7)

Country Link
EP (1) EP1344011A1 (fr)
JP (1) JP2004516135A (fr)
KR (1) KR20030067706A (fr)
AU (1) AU2002221845A1 (fr)
LU (1) LU90703B1 (fr)
TW (1) TW507009B (fr)
WO (1) WO2002050485A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3165271A1 (fr) * 2015-11-04 2017-05-10 Danieli Corus BV Procédé et dispositif de traitement de gaz de four

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1197074A (fr) * 1981-12-04 1985-11-26 Isaias Loukos Methode et installation de depollution des gaz venus la production de l'aluminium
WO1990005000A1 (fr) * 1988-10-31 1990-05-17 Dale Gordon Jones Procede et dispositifs pour nettoyer des gaz
ATE223748T1 (de) * 2000-02-21 2002-09-15 Rwe Rheinbraun Ag Verfahren sowie sorbens zur trockenen reinigung von abgasen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0250485A1 *

Also Published As

Publication number Publication date
LU90703B1 (de) 2002-07-16
KR20030067706A (ko) 2003-08-14
JP2004516135A (ja) 2004-06-03
WO2002050485A1 (fr) 2002-06-27
TW507009B (en) 2002-10-21
AU2002221845A1 (en) 2002-07-01

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