EP0164437B1 - Solution pour remonter la teneur en sels de bains de sels fondus - Google Patents

Solution pour remonter la teneur en sels de bains de sels fondus Download PDF

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Publication number
EP0164437B1
EP0164437B1 EP84106831A EP84106831A EP0164437B1 EP 0164437 B1 EP0164437 B1 EP 0164437B1 EP 84106831 A EP84106831 A EP 84106831A EP 84106831 A EP84106831 A EP 84106831A EP 0164437 B1 EP0164437 B1 EP 0164437B1
Authority
EP
European Patent Office
Prior art keywords
coal dust
supply
lines
transport
pressure
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
Application number
EP84106831A
Other languages
German (de)
English (en)
Other versions
EP0164437A1 (fr
Inventor
William G. Wood
John F. Pilznienski
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Priority to EP84106831A priority Critical patent/EP0164437B1/fr
Priority to AT84106831T priority patent/ATE29528T1/de
Priority to DE8484106831T priority patent/DE3466019D1/de
Publication of EP0164437A1 publication Critical patent/EP0164437A1/fr
Application granted granted Critical
Publication of EP0164437B1 publication Critical patent/EP0164437B1/fr
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts

Definitions

  • the invention relates to a device for the metered conveyance of dusty goods, in particular coal dust, for. B. in ovens, in particular for small and very small quantities, with a filling opening for the material to be conveyed, with a diffusion cone closing the conveyor on the output side, with at least one outlet opening for the material to be conveyed, with injector pipes penetrating the conveyor, which supply the compressed gas serve and are arranged opposite the outlet openings.
  • incinerators An area of application for the use of a device mentioned above is incinerators.
  • incinerators as well as in steelmaking furnaces, e.g. B. in cupola furnaces, oil or coke is usually used.
  • This coke or oil use could be reduced considerably by adding coal dust.
  • This coal dust is available in abundance as a waste product and has a higher calorific value in terms of weight unit than coke, it is cheaper and generally has a lower sulfur content than coke.
  • coal dust is added to the combustion of coke, reduced melting times can be achieved, and the storage and transportation of the coal dust are less problematic than that of coke.
  • a device for the pulverization of concrete consisting of a tubular conveying device and a transport device with an atomizing nozzle.
  • the material to be atomized is entered via a shaft and fed to the atomizing area by means of a screw, the special feature here being that this atomizing area initially widens in order to then narrow, so that a so-called blocking area is created in which the atomizing area Material is pressed through the screw and atomized by the atomizing nozzle and transported on.
  • the atomizer nozzle consists of a tube which is arranged inside the screw conveyor and which is supplied with compressed air.
  • a device for the simultaneous feeding of several burners with controllable amounts of a pulverized combustible substance.
  • the combustible pulverized substance is filled into a collector, after which a certain amount of air or gas is added to the burners in controllable quantities.
  • a collector for which a certain amount of air or gas is added to the burners in controllable quantities.
  • a fan tube extends in each of the lines leading to the burner, in which there is a higher air pressure than in the air flow in the pulverized fuel.
  • the nozzles are provided with regulating devices with which the additionally blown-in air can be regulated.
  • the pulverized fuel is entrained into the individual lines and led to the burner by the injected air, which has an injector effect.
  • an increased amount of pulverized fuel is automatically fed to the burner when the air output is increased, so that a regulation of the fuel-air mixture is obtained at the same time.
  • the invention has for its object to provide a device of the type mentioned for a metered supply of coal dust in furnaces, with which even the smallest quantities can be metered supplied to the furnace.
  • this object is achieved by a pressure application of the material to be conveyed into the conveying device, by one or more outlet openings, which continuously increase in the direction of the coal dust supply, and by the number of outlet openings corresponding injector pipes, which are adjustable relative to the respective outlet openings , solved.
  • the coal dust is fed continuously to the conveyor, the feed openings advantageously being connected to a storage container which is under pressure, so that the continuous feed is ensured. It has also been found to be advantageous to fluidize the coal dust in the outlet opening of the storage container, as a result of which disturbances in the continuous supply of the coal dust to the conveying device are avoided.
  • the coal dust is moved towards the exit opening, which is closed by a diffusion cone.
  • This diffusion cone has one or more openings to which the delivery lines are connected, which lead the coal dust to the furnace. These openings are flared towards the delivery opening, so that proper flow behavior of the coal dust in the delivery device and in the delivery lines is obtained.
  • Injector tubes which open into the diffusion cone are used to transport the coal dust, an injector tube being assigned to each outlet opening.
  • the distance of the front end of the injector tube relative to the outlet opening is adjustable, with all injector tubes being at the same distance from the outlet openings so that the delivery rate in the delivery lines is always the same.
  • the amount of coal dust conveyed in each case is set in a conveyor device according to the invention in two ways.
  • the amount can be regulated by the size of the pressure in the injector pipes, the smaller the delivery, the greater the selected injector pipe pressure.
  • Another possibility of adjusting the delivery rate is that the distance between the ends of the injector tubes from the outlet openings is changed. If the distance is increased, more coal dust is produced. With a corresponding reduction, the amount is reduced. With this mechanical fine adjustment, the amount of coal dust conveyed can be adjusted very precisely.
  • the amount conveyed is also dependent on how the feed pressure of the coal dust is selected in the conveyor. For constant control, this feed pressure should always be maintained evenly.
  • This is according to the invention, for. B. achieved in that the task of coal dust takes place via a pressure vessel, wherein a predetermined pressure is constantly maintained in this container.
  • the delivery lines are connected to a compressed air line via a bypass line. These bypass lines are used to then blow the delivery lines free, should there be any blockages in the delivery line due to the consistency of the coal dust.
  • the device for conveying coal dust is designated 1.
  • This device consists of a delivery pipe 2, which is provided with a laterally located filling opening 3 and is closed on its outlet side with a diffusion cone 4. Compressed air for transporting the coal dust is supplied to the device 1 via a supply line 5.
  • a valve 8 is flanged to the filling opening 3 of the device 1, on the other side of which a storage container 9 is fastened.
  • This storage container 9 receives the coal dust, which is fed through a filling opening 10, which can also be closed via a valve 11.
  • the reservoir 9 is further provided with a vent valve 12 and with two measuring probes 13 and 14, by means of which the fill level of the reservoir 9 can be determined with coal dust.
  • the reservoir 9 further has a connection 15 for a compressed air line 16, into which a control valve 17 is switched on to control the pressure. Furthermore, a check valve 18 is installed in the compressed air line 16. Via the compressed air line 16, the reservoir 9 is pressurized with compressed air, so that the coal dust is pressed out of the container 9 not only due to its own weight, but also due to the prevailing air pressure.
  • a compressed air supply line 20 is also inserted into the outlet opening 19 of the storage container 9, via which compressed air is introduced for fluidizing the coal dust, which improves the fluidity of the coal dust.
  • a check valve 21 is also installed in the compressed air line 20.
  • the compressed air lines 16 and 20 are connected to a pressure supply line 23 via a pressure control valve 22.
  • the supply line 5 for the device 1 is connected to the same pressure supply line 23 via a further pressure control valve 24.
  • a check valve 25 is installed between the pressure control valve 24 and the device 1.
  • a further compressed air line 26 which is provided with a shut-off valve 27, is connected to the supply line 23.
  • the compressed air line 26 branches into four bypass lines 28 which open into the delivery lines 6. The task of these bypass lines is to remove any blockages in the delivery lines 6 by briefly releasing a sufficiently high pressure.
  • the device according to the invention for metering the delivery rate for the coal dust is shown in FIGS. 3 and 4 on an enlarged scale.
  • the same parts are provided with the same reference numerals.
  • the conveyor device 1 consists of a conveyor tube 2, which is closed on its rear side except for a bore for receiving the supply line 5.
  • a stuffing box 29 is used for the pressure-tight sealing of supply line 5 and delivery pipe 2.
  • the supply pipe 5 is slidably arranged in the delivery pipe 2.
  • the supply pipe 5 extends through the entire delivery pipe 2 into the diffusion cone 4, which in this example is provided with four outlet openings 30. These outlet openings widen conically towards the feed side of the coal dust, so that the cross section towards the outlet openings 30 decreases continuously until the clear cross section of the delivery lines 6 is reached.
  • a distributor pipe 31 is connected to the supply line 5, which is provided with four injector pipes 32 which provide the outlet openings 30 open opposite.
  • the distance of the injector pipes 32 from the inlet openings 30 is also changed so that the delivery volume can be finely adjusted.
  • a measuring device 33 is attached to the delivery pipe 5, which is guided in a bushing 34 which is attached to the delivery pipe 2.
  • the filling opening 3 is arranged radially on the delivery pipe 2 and closed with a valve 8 which has a flange 35 for attachment to the storage container 9.
  • This valve 8 serves to shut off the influx of coal dust. This valve 8 is always closed when the reservoir 9 is loaded again. In the short period of time required for this, the supply is maintained by removing the coal dust from the device 1.
  • the device works as follows.
  • the coal dust is introduced into the storage container 9 from a bunker, wherein the ventilation of the storage container 9 occurs via the ventilation valve 12.
  • the valve 11 is closed and pressure in the reservoir 9 is built up via the line 16.
  • the valve 8 is then opened so that the coal dust from the storage container 9 can enter the feed pipe 2 of the device 1 via the fill opening 3.
  • the amount delivered depends on the one hand on the pressure in the storage container 9 and on the other hand on the pressure in the supply line or in the injector tubes 32 and also on the distance of the injector tubes from the outlet openings 30. The greater the pressure in the injector tubes is chosen, the more the amount subsidized is smaller.
  • the amount of coal dust conveyed increases, the greater the distance between the injector tubes 32 and the outlet openings 30.
  • the injector pressure is otherwise set so that a so-called flight promotion occurs in the delivery lines 6, d. H. that the extracted coal dust cannot be deposited in these lines.
  • the coal dust enters line sections 36 with a larger cross section, which act as so-called decompression units, so that the speed of the coal dust is thereby reduced and this is blown uniformly into the cupola furnace 7.
  • the delivery lines 6 are of the same length.
  • the maximum throughput of a conveying device is determined by the cross section of the conveying lines, the outlet openings and the pressure and the diameter of the injector pipes.
  • the dosage i.e. H. the minimal changes in quantity depend on the one hand on the choice of cross-sections. In any case, the quantity change is possible in grams.
  • the tests have shown that in the range from 0.1 kg / min to 20 kg / min there is a reliable change in quantity within the aforementioned range. This very precisely metered blowing of coal dust into furnaces ensures considerable energy savings, since here the usual heating agents such as gas, oil and coke can be substituted to a considerable extent.

Claims (14)

1. Dispositif de transport dosé de matières pulvérulentes, en particulier de poussière de charbon, par exemple dans des fours, en particulier par petites et très petites quantités, comprenant une ouverture d'entrée pour la matière à transporter, un cône de diffusion (4) fermant l'installation de transport du côté sortie, au moins une ouverture de sortie (30) pour la matière à transporter, et des tubes injecteurs (32), traversant l'installation de transport, qui servent à l'arrivée de gaz comprimé et qui sont disposés en regard des ouvertures de sortie (30), caractérisé par une alimentation sous pression de la matière à transporter dans l'installation de transport (2), par une ou plusieurs ouvertures de sortie (30) qui s'élargissent de façon continue dans la direction de l'alimentation en poussière de charbon, et par des tubes injecteurs (32) en nombre correspondant à celui des ouvertures de sortie (30), ces tubes étant déplaçables par rapport aux ouvertures de sortie (30) correspondantes.
2. Dispositif selon la revendication 1, caractérisé en ce que les tubes injecteurs (32) sont raccordés à un tube répartiteur commun (31), lequel est alimenté par un tube d'alimentation central (5) traversant l'installation de transport dans le sens de la longueur.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'ouverture d'entrée pour l'amenée de la poussière de charbon est établie, dans l'installation de transport (2), radialement par rapport au tube d'alimentation.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le tube d'alimentation (5) est maintenu avec possibilité de coulissement dans un guidage (27) du dispositif de transport (2).
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce qu'une conduite de transport (6) peut être raccordée à chaque ouverture de sortie (30), ces conduites étant reliées à des dérivations (bypass) (28) réglables.
6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que les conduites de transport (6) sont raccordées à des conduites d'amenée (36) ayant une plus grande section transversale que les premières (6).
7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que la pression dans la conduite d'alimentation (5) est réglable.
8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que l'ouverture de remplissage d'entrée pour la poussière de charbon peut être fermée par une vanne (8).
9. Dispositif selon l'une des revendications 1 à 8, caractérisé en ce que l'ouverture de remplissage d'entrée'est pourvue d'une bride (35) servant au raccordement d'un réservoir (9) contenant la poussière de charbon.
10. Dispositif selon la revendication 9, caractérisé en ce que le réservoir (9) est un récipient sous pression.
11. Dispositif selon l'une des revendications 9 ou 10, caractérisé en ce que le réservoir est relié à une conduite (16) réglable permettant l'arrivée de gaz comprimé.
12. Dispositif selon l'une des revendications 9 à 11, caractérisé en ce qu'une deuxième conduite réglable (20) de gaz comprimé débouche dans l'ouverture d'échappement (19) du réservoir (9).
13. Dispositif selon l'une des revendications 9 à 12, caractérisé en ce que le réservoir est pourvu d'une ouverture (10) obturable de remplissage.
14. Dispositif selon l'une des revendications 1 à 13, caractérisé en ce que des clapets antiretour (18, 21, 25) sont prévus dans les conduites amenant le gaz sous pression.
EP84106831A 1984-06-15 1984-06-15 Solution pour remonter la teneur en sels de bains de sels fondus Expired EP0164437B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP84106831A EP0164437B1 (fr) 1984-06-15 1984-06-15 Solution pour remonter la teneur en sels de bains de sels fondus
AT84106831T ATE29528T1 (de) 1984-06-15 1984-06-15 Loesung zum ergaenzen des salzgehaltes von geschmolzenen salzbaedern.
DE8484106831T DE3466019D1 (en) 1984-06-15 1984-06-15 Solution for replenishing the salt content of molten-salt baths

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84106831A EP0164437B1 (fr) 1984-06-15 1984-06-15 Solution pour remonter la teneur en sels de bains de sels fondus

Publications (2)

Publication Number Publication Date
EP0164437A1 EP0164437A1 (fr) 1985-12-18
EP0164437B1 true EP0164437B1 (fr) 1987-09-09

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EP84106831A Expired EP0164437B1 (fr) 1984-06-15 1984-06-15 Solution pour remonter la teneur en sels de bains de sels fondus

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EP (1) EP0164437B1 (fr)
AT (1) ATE29528T1 (fr)
DE (1) DE3466019D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69117927T2 (de) * 1991-04-02 1996-08-01 Unitika Ltd Verfahren zum Behandeln eines geschmolzenen Salzbades

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1477220A (fr) * 1966-04-25 1967-04-14 Kolene Corp Procédé et composition pour le nettoyage des métaux
US4109897A (en) * 1976-04-05 1978-08-29 Ajax Electric Company Salt reclamation system
DE2633772A1 (de) * 1976-07-28 1978-02-02 Degussa Verfahren zur beseitigung von haerterei- und galvanikabwaessern
US4113511A (en) * 1977-01-17 1978-09-12 Shoemaker Robert H Liquid additions to fused chemical baths
US4455251A (en) * 1982-09-20 1984-06-19 Kolene Corporation Aqueous solution of alkali metal compositions

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Publication number Publication date
ATE29528T1 (de) 1987-09-15
DE3466019D1 (en) 1987-10-15
EP0164437A1 (fr) 1985-12-18

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