EP0651058B1 - Process for introducing a second flow of powdered materials into a pneumatic transport system conveying powdered materials with adjustable flow rate - Google Patents
Process for introducing a second flow of powdered materials into a pneumatic transport system conveying powdered materials with adjustable flow rate Download PDFInfo
- Publication number
- EP0651058B1 EP0651058B1 EP94114430A EP94114430A EP0651058B1 EP 0651058 B1 EP0651058 B1 EP 0651058B1 EP 94114430 A EP94114430 A EP 94114430A EP 94114430 A EP94114430 A EP 94114430A EP 0651058 B1 EP0651058 B1 EP 0651058B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- stream
- pressure
- injection
- pulverulent materials
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000012254 powdered material Substances 0.000 title 2
- 239000000463 material Substances 0.000 claims description 34
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 description 27
- 239000003245 coal Substances 0.000 description 23
- 239000007787 solid Substances 0.000 description 22
- 239000000428 dust Substances 0.000 description 15
- 230000001105 regulatory effect Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 230000006837 decompression Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000005243 fluidization Methods 0.000 description 6
- 238000010926 purge Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/60—Mixing solids with solids
- B01F23/69—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
-
- 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
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
- B01F33/404—Mixers using gas or liquid agitation, e.g. with air supply tubes for mixing material moving continuously therethrough, e.g. using impinging jets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2113—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/2201—Control or regulation characterised by the type of control technique used
- B01F35/2203—Controlling the mixing process by feed-forward, i.e. a parameter of the components to be mixed is measured and the feed values are calculated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
- Y10S75/961—Treating flue dust to obtain metal other than by consolidation
Definitions
- the present invention relates to a method for introduce a second flow of powdery materials into a transport line carrying a first flow adjustable of powdery materials.
- the present invention concerns the introduction of dust extracted from blast furnace in a powdery coal flow.
- dry separators such as for example dust bags, cyclones, bag filters and electrostatic precipitators. These solid residues are collected in hoppers installed directly below the dry separators.
- Another potential solution is to inject the dust, near the blast furnace, in the pipe main pneumatic conveyor transporting coal powdery. This solution avoids unnecessary transport of dust and minimizes wear and tear on the pipes to abrasion by dust.
- coal injection is a parameter important in the operation of a blast furnace. It is therefore essential to be able to control exactly the flow of carbon injected at all times and avoid not disrupt the coal injection regime by the introduction of a second product flow in the debit powdery coal.
- the object of the present invention is to provide a process which makes it possible to introduce, in a controlled manner, a second flow of powdery materials in a pipe carrying a first regulated flow of materials pulverulent without disturbing this first flow.
- the present invention offers a method for introducing powdery materials in a pneumatic conveying line carrying a first adjustable flow rate of powdery materials, this process comprising the features of claim 1.
- the method according to the present invention presents the advantage that we can inject a second flow of powdery materials in a pneumatic system without disturb the regulation of the first flow.
- the first flow depends among other things on the conditions such as the pressure in the line at the point of dump. If you set the flow - either directly or indirectly - no longer at the point of discharge but in one point upstream of the injection point of the second flow, we sets the first flow as if a fictitious discharge point was at the regulatory point located upstream of the second injection site. Just take into account, in the parameters used to adjust the flow at this point, from the influence of the pipe end lying between the point and the actual discharge point.
- the first flow is adjusted by measuring and adjusting the first flow of powdery materials at a value predetermined upstream of the second injection point flux.
- the first flow is set by measuring the pressure and adjusting it to inside the pipe to a predetermined value in upstream of the injection point of the second flow.
- the second material flow powder is injected at the injection site in the middle of the first flow of powdery materials. This allows protect the walls of the pipes against abrasion due to particles injected.
- the second flow of materials powder is injected vertically in the direction of the flow of the first stream. This maintains the particles injected in the middle of the first material flow powdery and minimize abrasion.
- the second flow of pulverulent materials is maintained at a constant value.
- the advantage of controlling the second flow is that the disturbances caused in the system by this injection are less important and the regulation of the first flow becomes, therefore, less difficult.
- Figure 1 shows two silos 10, respectively 14 injection for powdered coal. These two silos alternately supply a discharge pipe 18 and are each equipped with a weighing system 22 making it possible to check the weight of the silo at all times and thus deduct the quantity of powdered coal evacuated per unit of time.
- the discharge line 18 is equipped a direct flow measurement device 23 and a direct flow adjustment device 24 or alternatively a pressure measuring device 26 and a pressure adjustment device 28 located upstream a device 30 for injecting a second flow of powdery products.
- the control device 23 and flow adjustment device 24 respectively the pressure control 26 and adjustment 28 allow regulate, efficiently and simply, the coal flow in pressure function in the injection silos powdered coal.
- the injection device 30 is preferably located in a vertical section of line 18 to facilitate the introduction of the second product.
- the device 30 consists of an enlarged section of the line 18 into which the second product is injected by means of an injection nozzle 34 preferably located at the middle of the enlarged section of said pipe 18. From this way, the second product, more abrasive than the coal, is kept in the middle of the coal flow which protects pipes against abrasion by particles injected.
- Line 18 leads to a distribution device 38 of powdery products as described, for example in the US Patent 5,123,632.
- this device the flow of products is divided and led to the different wind carriers and is finally injected into the blast furnace.
- the powdery material supply system injected through the nozzle 34 into the pneumatic line consists of a hopper 110 installed below a solid particle separator (not shown) of a blast furnace gas purification system.
- This hopper 110 receives the solid residues separated by the blast furnace gas separator.
- these gases blast furnaces include toxic gases like CO and more or less significant amounts of water vapor.
- Solid residues mainly consist of coke, coal and iron ore dust.
- a discharge line 112 fitted upstream of a closure member 114 for solid residues and downstream a gas-tight isolation valve 116, connects the hopper 110 to a closed cup 118.
- the closed cup 118 constitutes a thermally insulated pressure vessel, in which the discharge line 112 leads to its part superior.
- the vase 118 is equipped a fluidization device allowing to inject a gas from below, through the solid residue discharged in the closed vessel 118.
- the fluidization device is, for example, consisting of a permeable peripheral surface with gases and delimiting on the lower part of the vase 118 the solid residue storage space.
- a purge and decompression line 124 is advantageously connected to a separator 128.
- a hopper below the separator filter 128 discharges at through a discharge line 130, fitted with a valve gas tight isolation (not shown) in the vessel 118.
- the purge and decompression gases filtered by the separator 128 are discharged through a pipe drain 134 fitted with an isolation valve (not shown) gas tight.
- the gas supply to the fluidization device 120 is via a line 136 connected to a supply of gas (not shown).
- the lower end of the vase 118 opens out through an isolation valve 140 in a transport pipe pneumatic 144.
- the discharge line 112 allows, by opening the valve isolation 116 then the shutter member 114, gravity discharge of said solid residue from the hopper 110 in the closed cup 118.
- the shutter member 114 is closed at first, interrupting the discharge flow before close the gas-tight isolation valve 116.
- the purge valves and the valve are opened to allow evacuation of the gaseous content of the vessel 118.
- the fluidization device 120 is supplied with a constant flow of inert gas. This gas flow is blown from below through the solid residue to create a static bed or fluidized bed of particles solid.
- Inert gas causing the gases and vapors contained in the vessel 118 and trapped in the solid residues, is discharged through line 124, and the filter 128 in the purge line 134. In the separator 128 the mixture gas is separated from entrained solid particles.
- the closed vessel 118 is connected to a buffer silo 210 by the line 144.
- Said silo 210 is also equipped at its upper part of a decompression 214.
- This decompression 214 is advantageously connected to a separator 218.
- a hopper in the lower part of the separator 218 discharges the solid particles retained by the filter through a discharge line 222, provided a gas tight shut-off valve (not shown), in silo 210.
- the decompression gases filtered by the separator 218, are discharged through a pipe discharge 226 fitted with a sealed isolation valve 230 gas.
- This valve 230 is connected to a device for regulation 234 of the pressure controlled by a device 238 pressure measuring device permanently monitoring the pressure inside silo 210.
- a source gas supply (not shown) supplies the silo 210 into a gas by means of a pipe 242.
- a second branch 254 feeds the upper part of the silo 210 in gas. This supply is regulated by a valve 258 fitted with a regulating device 262, controlled by the pressure measuring device 238.
- This equipment makes it possible to control and adjust the pressure inside silo 210 at all times. Indeed when filling silo 210, the overpressure is released via decompression 214.
- the regulating device 234 controlled by the pressure measuring device 238 does let out only the amount of gas needed to maintain the pressure inside the silo 210 at a predetermined value.
- gas is injected into the fluidizing member and if necessary via line 254 with the valve open if the pressure falls below a set value.
- This silo 210 thanks to this pressure regulation, can be loaded and unloaded simultaneously without variation of discharge rate.
- Silo 210 is also equipped with a 266 weighing system so that you can determine the weight of the silo 210 and deduct the flow during unloading.
- the powdery materials, fluidized inside the silo 210 are evacuated through the lower part of silo 210 equipped with a shutter 270 which is controlled by a device for determining the flow rate 274 connected to the weighing system 266.
- the material flow is fluidized in a fluidization 278 located at the exit of silo 210 before the flow is not injected into the discharge line 18 via the injection device 30. This way of proceeding allows continuous injection of a controlled flow of powdery materials in the pipe 18.
- Figure 2 schematically shows a circuit tire comprising an injection device for a second flow of powdery materials and pressures reigning in this circuit.
- Curve A shows a pressure diagram of a duct not including an injection device for a second flow of pulverulent materials.
- Curve B shows a pressure diagram of a circuit comprising a device for injecting a second flow of powdery materials without adjusting device.
- the vertical arrows indicate the variations of the pressure over time in this circuit.
- pressures and consequently flow rates vary greatly and the first flow of materials, that powdered carbon, in this case, varies very strongly in function of pressure variations induced by the injection of the second stream. Under these conditions, it becomes very difficult to control the conduct of the blast furnace because we no longer know how to effectively regulate the quantity of carbon injected over time.
- curve C represents the variations of the pressure in the set circuit as described above.
- the regulatory body 24 plays an important role in adjust the pressure and therefore the flow of coal injected.
- the regulating member 24 makes it possible to work with higher supply pressure to the same powdery coal flow and this pressure is independent of variations in pressure in the remaining of the circuit.
- By opening or closing the organ of advantage regulation more or less pressure drop is created smaller, so as to adjust the pressure before said organ to pressure variations created by the device injection of the second flow of pulverulent materials. Yes the pressure increased downstream of the regulator, this one would be opened further so as to create a loss less load. If, on the contrary, the pressure decreased downstream of the regulatory body, that would be closed a little more so as to create a more pressure drop important. It is important to emphasize that this loss artificial and adjustable load does not influence the flow of injected carbon because the pressure in the tank is not not influenced by the regulatory body.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Air Transport Of Granular Materials (AREA)
- Blast Furnaces (AREA)
Description
La présente invention concerne un procédé pour introduire un deuxième flux de matériaux pulvérulents dans une conduite de transport véhiculant un premier débit réglable de matériaux pulvérulents.The present invention relates to a method for introduce a second flow of powdery materials into a transport line carrying a first flow adjustable of powdery materials.
Quoique n'y étant pas limitée, la présente invention concerne l'introduction de poussières extraites de gaz de haut-fourneau dans un débit de charbon pulvérulent.Although not limited thereto, the present invention concerns the introduction of dust extracted from blast furnace in a powdery coal flow.
Dans les installations d'épuration de gaz de haut-fourneau, les polluants solides sont séparés de la phase gazeuse à l'aide de séparateurs secs comme par exemple des sacs à poussière, des cyclones, des filtres à manches et des électrofiltres. Ces résidus solides sont collectés dans des trémies installées directement en-dessous des séparateurs secs.In blast furnace gas cleaning plants, solid pollutants are separated from the phase gaseous using dry separators such as for example dust bags, cyclones, bag filters and electrostatic precipitators. These solid residues are collected in hoppers installed directly below the dry separators.
Ces trémies, qui doivent être vidangées régulièrement, déchargent, par l'intermédiaire d'équipements d'extraction, librement les résidus solides, soit directement dans des wagons ou bacs de camions, soit simplement sur un tas en-dessous des trémies. Les résidus solides sont chargés ensuite par des pelles mécaniques sur des wagons ou camions puis évacués vers une décharge. On notera que les résidus solides séparés des gaz de haut-fourneau sont principalement constitués de poussières de fer et de coke.These hoppers, which must be emptied regularly, unload, via extraction equipment, freely the solid residues, either directly in wagons or bins of trucks, either simply on a pile below hoppers. Solid residues are loaded then by mechanical shovels on wagons or trucks then evacuated to a landfill. Note that the residues solids separated from blast furnace gases are mainly consisting of iron dust and coke.
L'opération d'évacuation des résidus solides des trémies de séparateurs est une opération très poussiéreuse, ce qui entraíne incontestablement des problèmes du point-de-vue salubrité du lieu de travail et protection de l'environnement. Ensuite le déversement à l'air libre des résidus solides libère aussi de façon incontrôlée des gaz et des vapeurs nocives ou toxiques qui sont entraínés par les résidus solides en-dehors de l'installation d'épuration de gaz lors de la décharge de la trémie. Ces gaz et vapeurs libérés de façon incontrôlée représentent incontestablement un problème de sécurité non-négligeable. Il est évident que cette manutention discontinue des résidus solides est une pratique peu salubre, polluante et coûteuse. Afin d'éviter de devoir mettre en décharge ces résidus solides, on a pensé à les réintroduire dans le haut-fourneau. Un moyen d'introduction qui s'impose est évidement l'installation d'injection de charbon pulvérulent dans le haut-fourneau via les tuyères du porte-vent. En effet, ici on dispose d'une installation d'injection de grande quantités de matériaux pulvérulents dans le haut-fourneau. Si on savait utiliser cette installation pour réinjecter les poussières dans le haut-fourneau, on disposerait d'un moyen élégant pour revaloriser les matières contenues dans les poussières et on éviterait les frais de mise en décharge de ces poussières.The operation for removing solid residues from separator hoppers is a very dusty operation, which undoubtedly leads to problems from the point of view workplace health and safety the environment. Then the open air discharge of solid residue also releases gases uncontrollably and noxious or toxic vapors that are entrained by solid residues outside the treatment plant gas when unloading the hopper. These gases and vapors uncontrollably released unquestionably represent a significant security problem. It's obvious that this discontinuous handling of solid residues is a unsanitary, polluting and expensive. To avoid to have to landfill these solid residues, we have thought of reintroducing them into the blast furnace. A way The obvious introduction is obviously the installation powdery coal injection into the blast furnace via the nozzles of the wind carrier. Indeed, here we have a facility for injecting large quantities of powdery materials in the blast furnace. If we knew use this installation to reinject dust in the blast furnace, we would have an elegant way to revalue the materials contained in the dust and we would avoid the landfill costs of these dust.
Le moyen le plus simple serait évidemment de mélanger les poussières au charbon dans les silos de stockage et d'injecter un mélange de charbon et de poussières dans le haut-fourneau. Cette solution présente cependant plusieurs désavantages. En effet, les silos de stockage du charbon sont normalement assez éloignés du haut-fourneau et des installations d'épuration des gaz. Il faudrait donc transporter les poussières de l'installation d'épuration vers les silos de stockage et puis les ramener vers le haut-fourneau. Comme les poussières sont beaucoup plus abrasives que les particules de charbon, cette méthode risquerait d'user rapidement les conduites de transport du charbon. De plus, on ne saurait contrôler avec précision la quantité de charbon injectée car la concentration en charbon n'est pas connue et n'est pas constante.The simplest way would obviously be to mix coal dust in storage silos and inject a mixture of coal and dust into the blast furnace. However, this solution presents several disadvantages. Indeed, the coal storage silos are normally quite far from the blast furnace and gas cleaning plants. It would therefore be necessary transport the dust from the purification plant to the storage silos and then bring them back to the blast furnace. As the dust is much more abrasive than carbon particles, this method could quickly wear out the transport lines of the coal. Furthermore, one cannot precisely control the quantity of coal injected because the concentration of coal is not known and is not constant.
Une autre solution potentielle consiste à injecter les poussières, à proximité du haut-fourneau, dans la conduite de transport pneumatique principale véhiculant le charbon pulvérulent. Cette solution évite le transport inutile des poussières et permet de minimiser l'usure des conduites due à l'abrasion par les poussières.Another potential solution is to inject the dust, near the blast furnace, in the pipe main pneumatic conveyor transporting coal powdery. This solution avoids unnecessary transport of dust and minimizes wear and tear on the pipes to abrasion by dust.
Cependant, l'injection de charbon est un paramètre important dans l'exploitation d'un haut-fourneau. Il est donc primordial de pouvoir contrôler exactement le débit de charbon injecté à tout moment et il faut éviter de ne pas perturber le régime d'injection du charbon par l'introduction d'un deuxième flux de produits dans le débit de charbon pulvérulent.However, coal injection is a parameter important in the operation of a blast furnace. It is therefore essential to be able to control exactly the flow of carbon injected at all times and avoid not disrupt the coal injection regime by the introduction of a second product flow in the debit powdery coal.
Le but de la présente invention est de prévoir un procédé qui permette d'introduire, d'une manière contrôlée, un deuxième flux de matériaux pulvérulents dans une conduite véhiculant un premier débit réglé de matériaux pulvérulents sans perturber ce premier débit.The object of the present invention is to provide a process which makes it possible to introduce, in a controlled manner, a second flow of powdery materials in a pipe carrying a first regulated flow of materials pulverulent without disturbing this first flow.
Pour atteindre cet objectif, la présente invention propose un procédé d'introduction de matériaux pulvérulents dans une conduite de transport pneumatique véhiculant un premier débit réglable de matériaux pulvérulents, ce procédé comportant les caractéristiques de la revendication 1.To achieve this objective, the present invention offers a method for introducing powdery materials in a pneumatic conveying line carrying a first adjustable flow rate of powdery materials, this process comprising the features of claim 1.
Le procédé selon la présente invention présente l'avantage que l'on peut injecter un deuxième flux de matériaux pulvérulents dans un système pneumatique sans perturber la régulation du premier débit. En effet, le premier débit est fonction entre autres des conditions comme p.ex. la pression dans la conduite au point de décharge. Si on règle le débit - soit directement soit indirectement - non plus au point de décharge mais en un point en amont du point d'injection du deuxième flux, on règle le premier débit comme si un point de décharge fictif se trouvait au point de régulation situé en amont du deuxième point d'injection. Il suffit de tenir compte, dans les paramètres utilisés pour régler le débit à ce point, de l'influence du bout de conduite se situant entre le point de régulation et le point de décharge réel.The method according to the present invention presents the advantage that we can inject a second flow of powdery materials in a pneumatic system without disturb the regulation of the first flow. Indeed, the first flow depends among other things on the conditions such as the pressure in the line at the point of dump. If you set the flow - either directly or indirectly - no longer at the point of discharge but in one point upstream of the injection point of the second flow, we sets the first flow as if a fictitious discharge point was at the regulatory point located upstream of the second injection site. Just take into account, in the parameters used to adjust the flow at this point, from the influence of the pipe end lying between the point and the actual discharge point.
Selon un premier mode de réalisation avantageux, le premier débit est réglé en mesurant et en ajustant le premier débit de matériaux pulvérulents à une valeur prédéterminée en amont du point d'injection du deuxième flux.According to a first advantageous embodiment, the first flow is adjusted by measuring and adjusting the first flow of powdery materials at a value predetermined upstream of the second injection point flux.
Selon un mode de réalisation préféré, le premier débit est réglé en mesurant la pression et en l'ajustant à l'intérieur de la conduite à une valeur prédéterminée en amont du point d'injection du deuxième flux.According to a preferred embodiment, the first flow is set by measuring the pressure and adjusting it to inside the pipe to a predetermined value in upstream of the injection point of the second flow.
Préférablement, le deuxième flux de matériaux pulvérulents est injecté au point d'injection au milieu du premier flux de matériaux pulvérulents. Ceci permet de protéger les parois des conduites contre l'abrasion due aux particules injectées.Preferably, the second material flow powder is injected at the injection site in the middle of the first flow of powdery materials. This allows protect the walls of the pipes against abrasion due to particles injected.
Avantageusement, le deuxième flux de matériaux pulvérulents est injecté verticalement dans le sens de l'écoulement du premier flux. Ceci permet de maintenir les particules injectées au milieu du premier flux de matériaux pulvérulents et de minimiser l'abrasion.Advantageously, the second flow of materials powder is injected vertically in the direction of the flow of the first stream. This maintains the particles injected in the middle of the first material flow powdery and minimize abrasion.
Selon encore un autre mode de réalisation avantageux, le deuxième flux de matériaux pulvérulents est maintenu à une valeur constante. L'avantage de contrôler le deuxième débit, est que les perturbations causées dans le système par cette injection sont moins importantes et la régulation du premier débit devient, dès lors, moins difficile.According to yet another advantageous embodiment, the second flow of pulverulent materials is maintained at a constant value. The advantage of controlling the second flow, is that the disturbances caused in the system by this injection are less important and the regulation of the first flow becomes, therefore, less difficult.
Il est important de noter que le présent procédé permet d'introduire les deux matériaux différents à un rapport prédéterminé. Il est donc possible de connaítre à chaque instant la quantité de charbon injectée.It is important to note that the present process allows to introduce two different materials to a report predetermined. It is therefore possible to know each instant the amount of coal injected.
D'autres particularités et caractéristiques ressortiront de la description d'un mode de réalisation avantageux, présenté ci-dessous, à titre d'illustration en référence aux figures annexées, dans lesquelles :
- la Figure 1 représente un schéma général d'une installation d'injection de charbon pulvérulent et de poussières et
- la Figure 2 représente un schéma des pressions en fonction des différents points d'un circuit comprenant un point d'injection pour un deuxième flux de matériaux pulvérulents.
- FIG. 1 represents a general diagram of an installation for injecting powdered coal and dust and
- FIG. 2 represents a diagram of the pressures as a function of the different points of a circuit comprising an injection point for a second flow of pulverulent materials.
La Figure 1 montre deux silos 10, respectivement 14
d'injection pour le charbon pulvérulent. Ces deux silos
alimentent alternativement une conduite d'évacuation 18 et
sont équipés chacun d'un système de pesage 22 permettant de
contrôler, à chaque instant, le poids du silo et d'en
déduire ainsi la quantité de charbon pulvérulent évacuée
par unité de temps. La conduite d'évacuation 18 est équipée
d'un dispositif de mesure directe du débit 23 et d'un
dispositif d'ajustage direct du débit 24 ou alternativement
d'un dispositif de mesure de la pression 26 et d'un
dispositif d'ajustage de la pression 28 situés en amont
d'un dispositif d'injection 30 d'un deuxième flux de
produits pulvérulents. Le dispositif de contrôle 23 et
d'ajustage de débit 24 respectivement le dispositif de
contrôle 26 et d'ajustage 28 de la pression permettent de
régler, efficacement et simplement, le débit de charbon en
fonction de la pression régnant dans les silos d'injection
du charbon pulvérulent. Au point de régulation, on
maintient la pression, à l'intérieur de la conduite 18, à
un niveau plus élevé que la pression d'injection du
deuxième produit au niveau du dispositif d'injection 30. De
cette manière, l'injection du deuxième produit ne
perturbera pas le débit du charbon pulvérulent. Le débit de
charbon devient ainsi indépendant de la pression au point
de décharge. Figure 1 shows two
Le dispositif d'injection 30 se trouve, de préférence,
dans une section verticale de la conduite 18 pour faciliter
l'introduction du deuxième produit.The
Le dispositif 30 se compose d'une section élargie de la
conduite 18 dans laquelle on injecte le deuxième produit
moyennant une buse d'injection 34 située, de préférence, au
milieu de la section élargie de ladite conduite 18. De
cette manière, le deuxième produit, plus abrasif que le
charbon, est maintenu au milieu du débit de charbon ce qui
protège les conduites contre l'abrasion par les particules
injectées.The
La conduite 18 aboutit à un dispositif de distribution
38 de produits pulvérulents tel que décrit p.ex. dans le
brevet US 5,123,632. Dans ce dispositif, le débit de
produits est divisé et conduit vers les différents porte-vents
et est injecté finalement dans le haut-fourneau.
Le système d'alimentation en matériaux pulvérulents
injectés par la buse 34 dans la conduite pneumatique, se
compose d'une trémie 110 installée en-dessous d'un
séparateur de particules solides (non montré) d'une
installation d'épuration de gaz de haut-fourneau. Cette
trémie 110 reçoit les résidus solides séparés par le
séparateur du gaz de haut-fourneau. On notera que ces gaz
de haut-fourneau comprennent des gaz toxiques comme le CO
et des quantités plus ou moins importantes de vapeur d'eau.
Les résidus solides sont principalement constitués de
poussières de coke, de charbon et de minerais de fer.The powdery material supply system
injected through the
Une conduite de décharge 112, équipée en amont d'un
organe d'obturation 114 pour les résidus solides et en aval
d'une vanne d'isolement 116 étanche aux gaz, relie la
trémie 110 à un vase clos 118. Le vase clos 118 constitue
un récipient de pression isolé thermiquement, dans lequel
la conduite de décharge 112 débouche à sa partie
supérieure. A sa partie inférieure, le vase 118 est équipé
d'un dispositif de fluidisation permettant d'insuffler un
gaz par en-dessous, à travers les résidus solides déchargés
dans le vase clos 118. Le dispositif de fluidisation est,
par exemple, constitué d'une surface périphérique perméable
aux gaz et délimitant sur la partie inférieure du vase 118
l'espace de stockage des résidus solides.A
A partir de la partie supérieure du vase clos part
aussi une conduite de purge et de décompression 124. Cette
conduite de purge et de décompression 124 est
avantageusement connectée à un séparateur 128. Une trémie
en-dessous du filtre du séparateur 128 se décharge à
travers une conduite de décharge 130, munie d'une vanne
d'isolement (non-représentée) étanche au gaz, dans le vase
118. Les gaz de purge et de décompression filtrés par le
séparateur 128 sont évacués à travers une conduite
d'évacuation 134 munie d'une vanne d'isolement (non-représentée)
étanche au gaz.From the top of the closed cup leaves
also a purge and
L'alimentation en gaz du dispositif de fluidisation 120
se fait par une conduite 136 reliée à une alimentation en
gaz (non montrée).The gas supply to the fluidization device 120
is via a
L'extrémité inférieure du vase 118 débouche à travers
une vanne d'isolement 140 dans une conduite de transport
pneumatique 144.The lower end of the
Le fonctionnement du dispositif décrit dans ce qui précède peut être résumé comme suit:The operation of the device described in what can be summarized as follows:
La conduite de décharge 112 permet, en ouvrant la vanne
d'isolement 116 puis l'organe d'obturation 114, de
décharger par gravité lesdits résidus solides de la trémie
110 dans le vase clos 118. Lorsque le vase clos est rempli
jusqu'à une certaine hauteur, ce qui est détecté par un
détecteur de niveau, l'organe d'obturation 114 est fermé en
premier lieu, interrompant le flux de décharge avant de
fermer la vanne d'isolement étanche au gaz 116. Lors du
chargement du vase 118, les vannes de purge et la vanne
d'isolement sont ouvertes afin de permettre une évacuation
du contenu gazeux du vase 118.The
Ensuite le dispositif de fluidisation 120 est alimenté avec un débit constant de gaz inerte. Ce débit de gaz est insufflé par en-dessous à travers les résidus solides pour créer un lit statique ou lit fluidisé de particules solides.Then the fluidization device 120 is supplied with a constant flow of inert gas. This gas flow is blown from below through the solid residue to create a static bed or fluidized bed of particles solid.
Le gaz inerte, entraínant les gaz et vapeurs contenus
dans le vase 118 et emprisonnés dans les résidus solides,
est évacué à travers la conduite 124, et le filtre 128 dans
la conduite de purge 134. Dans le séparateur 128 le mélange
de gaz est séparé des particules solides entraínées.Inert gas, causing the gases and vapors contained
in the
Le vase clos 118 est relié à un silo tampon 210 par la
conduite 144. Ledit silo 210 est, lui aussi, équipé à sa
partie supérieure d'une décompression 214. Cette
décompression 214 est avantageusement connectée à un
séparateur 218. Une trémie dans la partie inférieure du
séparateur 218 décharge les particules solides retenues par
le filtre à travers une conduite de décharge 222, munie
d'une vanne d'obturation (non-représentée) étanche au gaz,
dans le silo 210. Les gaz de décompression filtrés par le
séparateur 218, sont évacués à travers une conduite
d'évacuation 226 munie d'une vanne d'isolement 230 étanche
au gaz. Cette vanne 230 est reliée à un dispositif de
régulation 234 de la pression commandée par un dispositif
de mesure 238 de la pression contrôlant en permanence la
pression régnant à l'intérieur du silo 210. Une source
d'alimentation en gaz (non-représentée) alimente le silo
210 en un gaz moyennant une conduite 242. Une première
branche 246, comprenant une vanne 250 étanche au gaz,
alimente un dispositif de fluidisation tel que décrit plus
haut, situé dans la partie inférieure du silo 210. Une
deuxième branche 254 alimente la partie supérieure du silo
210 en gaz. Cette alimentation est réglée par une vanne 258
munie d'un dispositif de régulation 262, commandée par le
dispositif de mesure 238 de la pression.The
Cet équipement permet de contrôler et régler la
pression à l'intérieur du silo 210 à tout instant. En effet
lors du remplissage du silo 210, la surpression est évacuée
via la décompression 214. Le dispositif de régulation 234
commandé par le dispositif de mesure de la pression 238 ne
laisse échapper que la quantité de gaz nécessaire pour
maintenir la pression à l'intérieur du silo 210 à une
valeur prédéterminée. Lors du déchargement du silo, du gaz
est injecté dans l'organe de fluidisation et si nécessaire
par la conduite 254 dont la vanne est ouverte si la
pression tombe en- dessous d'une valeur de consigne. Ce
silo 210, grâce à cette régulation de la pression, peut
être chargé et déchargé simultanément sans variation du
débit de déchargement.This equipment makes it possible to control and adjust the
pressure inside
Le silo 210 est aussi équipé d'un système de pesage 266
de façon à pouvoir déterminer à tout instant le poids du
silo 210 et d'en déduire le débit lors du déchargement.
Les matériaux pulvérulents, fluidisés à l'intérieur du
silo 210 sont évacués par la partie inférieure du silo 210
équipée d'un organe d'obturation 270 qui est commandé par
un dispositif de détermination du débit 274 relié au
système de pesage 266.The powdery materials, fluidized inside the
Le flux de matériaux est fluidisé dans une chambre de
fluidisation 278 située à la sortie du silo 210 avant que
le flux ne soit injecté dans la conduite d'évacuation 18
via le dispositif d'injection 30. Cette façon de procéder
permet d'injecter en continue un débit contrôlé de
matériaux pulvérulents dans la conduite 18.The material flow is fluidized in a
Un des grands avantages de ce système est que les poussières sont injectées de nouveau dans le haut-fourneau sans contact avec l'air libre. Une pollution de l'environnement et des lieux de travail par les poussières est par conséquent éliminée.One of the great advantages of this system is that the dust is injected back into the blast furnace without contact with the open air. Pollution of environment and workplaces by dust is therefore eliminated.
La figure 2 montre schématiquement un circuit pneumatique comprenant un dispositif d'injection pour un deuxième flux de matériaux pulvérulents et les pressions régnant dans ce circuit.Figure 2 schematically shows a circuit tire comprising an injection device for a second flow of powdery materials and pressures reigning in this circuit.
La courbe A montre un diagramme de pression d'un conduit ne comprenant pas de dispositif d'injection pour un deuxième flux de matériaux pulvérulents. Curve A shows a pressure diagram of a duct not including an injection device for a second flow of pulverulent materials.
La courbe B montre un diagramme de pression d'un circuit comprenant un dispositif d'injection d'un deuxième flux de matériaux pulvérulents sans dispositif de réglage. Les flèches verticales indiquent les variations de la pression au cours du temps dans ce circuit. Sans régulation, les pressions et par conséquent les débits varient fortement et le premier débit de matériaux, celui du charbon pulvérulent, en l'occurrence, varie très fort en fonction des variations de pression induites par l'injection du deuxième flux. Dans ces conditions, il devient très difficile de contrôler la conduite du haut-fourneau car on ne sait plus régler efficacement la quantité de charbon injectée au cours du temps.Curve B shows a pressure diagram of a circuit comprising a device for injecting a second flow of powdery materials without adjusting device. The vertical arrows indicate the variations of the pressure over time in this circuit. Without regulation, pressures and consequently flow rates vary greatly and the first flow of materials, that powdered carbon, in this case, varies very strongly in function of pressure variations induced by the injection of the second stream. Under these conditions, it becomes very difficult to control the conduct of the blast furnace because we no longer know how to effectively regulate the quantity of carbon injected over time.
Enfin la courbe C représente les variations de la
pression dans le circuit réglé tel que décrit ci-dessus.
L'organe de régulation 24 joue une rôle important pour
ajuster la pression et par conséquent le débit de charbon
injecté. En effet, l'organe de régulation 24 permet de
travailler avec une pression d'alimentation supérieure pour
le même débit de charbon pulvérulent et cette pression est
indépendante des variations de la pression régnant dans le
restant du circuit. En ouvrant ou en fermant l'organe de
régulation d'avantage, on crée une perte de charge plus ou
moins grande, de sorte à ajuster la pression avant ledit
organe aux variations de pressions créées par le dispositif
d'injection du deuxième flux de matériaux pulvérulents. Si
la pression augmentait en aval de l'organe de régulation,
celui-ci serait ouvert davantage de sorte à créer une perte
de charge moins grande. Si, au contraire la pression
diminuait en aval de l'organe de régulation, celui serait
fermé un peu plus de sorte à créer une perte de charge plus
importante. Il est important de souligner que cette perte
charge artificielle et réglable n'influence pas le débit de
charbon injecté, car la pression dans le réservoir n'est
pas influencée par l'organe de régulation.Finally curve C represents the variations of the
pressure in the set circuit as described above.
The
Claims (6)
- Process for feeding a second stream of pulverulent materials into a pneumatic conveying pipe carrying a first controllable flow of pulverulent materials, characterized in that the second stream of pulverulent materials is fed at a controlled rate and that the first pneumatically conveyed flow is controlled, directly or indirectly, at a control point located upstream of the injection point of the second stream ; the pressure inside the line being maintained, by virtue of the control point, at a higher pressure than the injection pressure of the second stream, in order to render the flow of the first stream insensitive to the disturbances caused by the feeding of the second stream.
- Process according to claim 1, characterized in that the first flow is controlled by measuring the first flow of pulverulent materials and adjusting it to a predetermined value upstream of the injection point of the second stream.
- Process according to claim 1, characterized in that the first flow is controlled by measuring the pressure and adjusting it inside the pneumatic conveying line to a predetermined value upstream of the injection point of the second stream.
- Process according to any one of claims 1 to 3, characterized in that the second stream of pulverulent materials is injected at an injection point located in the heart of the first stream of pulverulent materials.
- Process according to claim 4, characterized in that the second stream of pulverulent materials is injected vertically into the pneumatic conveying line in the direction of flow.
- Process according to any one of claims 1 to 5, characterized in that the second flow of pulverulent materials is maintained at a constant rate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU88422 | 1993-11-03 | ||
LU88422A LU88422A1 (en) | 1993-11-03 | 1993-11-03 | Method for introducing a second flow rate of pulverulent material into a pneumatic conveying line carrying a first adjustable flow rate of pulverulent material |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0651058A1 EP0651058A1 (en) | 1995-05-03 |
EP0651058B1 true EP0651058B1 (en) | 2000-08-23 |
Family
ID=19731450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94114430A Expired - Lifetime EP0651058B1 (en) | 1993-11-03 | 1994-09-14 | Process for introducing a second flow of powdered materials into a pneumatic transport system conveying powdered materials with adjustable flow rate |
Country Status (7)
Country | Link |
---|---|
US (1) | US5516356A (en) |
EP (1) | EP0651058B1 (en) |
BR (1) | BR9404543A (en) |
CA (1) | CA2118262C (en) |
DE (1) | DE69425627T2 (en) |
LU (1) | LU88422A1 (en) |
RU (1) | RU2150422C1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8906336B2 (en) * | 2000-09-15 | 2014-12-09 | Siddhartha Gaur | Blast furnace metallurgical coal substitute products and method |
US6719956B1 (en) | 2000-09-15 | 2004-04-13 | Siddhartha Gaur | Carbonaceous material products and a process for their production |
AUPR817201A0 (en) * | 2001-10-09 | 2001-11-01 | Technological Resources Pty Limited | Supplying solid feed materials for a direct smelting process |
GB0409318D0 (en) * | 2004-04-27 | 2004-06-02 | Its Drilling Services Ltd | Material transportation apparatus and method |
LU92037B1 (en) * | 2012-07-06 | 2014-01-07 | Wurth Paul Sa | Device for depressurizing a pressurized reservoir for storing granular or pulverulent material, and installation for distributing pulverulent material by pneumatic transport comprising such a device |
LU92534B1 (en) * | 2014-09-03 | 2016-03-04 | Wurth Paul Sa | Enhanced pressurising of bulk material in lock hoppers |
JP6742746B2 (en) * | 2016-02-08 | 2020-08-19 | 三菱日立パワーシステムズ株式会社 | Pressurization system for powder supply hopper, gasification equipment, gasification combined cycle power generation equipment, and pressurization method for powder supply hopper |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0211295A1 (en) * | 1985-08-05 | 1987-02-25 | Paul Wurth S.A. | Method and apparatus for pneumatically injecting dosed pulverized solid material into a changing-pressure reactor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR687234A (en) * | 1929-12-26 | 1930-08-06 | Device for dosing and mixing liquids | |
US3337195A (en) * | 1966-03-15 | 1967-08-22 | Grace W R & Co | Foam generating apparatus |
FR2319410A1 (en) * | 1975-07-31 | 1977-02-25 | Aquitaine Petrole | OPTIMIZED PLANT FOR DISPERSION OF WASTE GASES |
JP2827451B2 (en) * | 1990-05-15 | 1998-11-25 | 住友金属工業株式会社 | Blast furnace tuyere powder injection operation method |
JPH05239511A (en) * | 1991-02-28 | 1993-09-17 | Nippon Steel Corp | Method for injecting powder into blast furnace tuyere |
US5447550A (en) * | 1994-09-21 | 1995-09-05 | Hylsa S.A. De C.V. | Method and apparatus for the pneumatic transport of iron-bearing particles |
-
1993
- 1993-11-03 LU LU88422A patent/LU88422A1/en unknown
-
1994
- 1994-09-14 EP EP94114430A patent/EP0651058B1/en not_active Expired - Lifetime
- 1994-09-14 DE DE69425627T patent/DE69425627T2/en not_active Expired - Lifetime
- 1994-10-17 CA CA002118262A patent/CA2118262C/en not_active Expired - Lifetime
- 1994-10-25 US US08/328,677 patent/US5516356A/en not_active Expired - Lifetime
- 1994-11-01 BR BR9404543A patent/BR9404543A/en not_active IP Right Cessation
- 1994-11-03 RU RU94040172/28A patent/RU2150422C1/en active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0211295A1 (en) * | 1985-08-05 | 1987-02-25 | Paul Wurth S.A. | Method and apparatus for pneumatically injecting dosed pulverized solid material into a changing-pressure reactor |
Also Published As
Publication number | Publication date |
---|---|
RU2150422C1 (en) | 2000-06-10 |
RU94040172A (en) | 1996-09-20 |
DE69425627T2 (en) | 2001-04-19 |
DE69425627D1 (en) | 2000-09-28 |
US5516356A (en) | 1996-05-14 |
CA2118262A1 (en) | 1995-05-04 |
EP0651058A1 (en) | 1995-05-03 |
BR9404543A (en) | 1995-07-04 |
LU88422A1 (en) | 1995-07-10 |
CA2118262C (en) | 2005-11-22 |
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