EP0030376B1 - Procédé et dispositif de séchage et de réchauffage de charbon humide - Google Patents

Procédé et dispositif de séchage et de réchauffage de charbon humide Download PDF

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Publication number
EP0030376B1
EP0030376B1 EP19800107653 EP80107653A EP0030376B1 EP 0030376 B1 EP0030376 B1 EP 0030376B1 EP 19800107653 EP19800107653 EP 19800107653 EP 80107653 A EP80107653 A EP 80107653A EP 0030376 B1 EP0030376 B1 EP 0030376B1
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EP
European Patent Office
Prior art keywords
inert gas
coal
circulation
drying
gas circulation
Prior art date
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Expired
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EP19800107653
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German (de)
English (en)
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EP0030376A3 (en
EP0030376A2 (fr
Inventor
August Ing.Grad. Schaper
Heinrich Ing.Grad. Mohmeyer
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CESSIONE;AMMAN IMA GMBH
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Alfelder Eisenwerke Carl Heise KG
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Publication of EP0030376A2 publication Critical patent/EP0030376A2/fr
Publication of EP0030376A3 publication Critical patent/EP0030376A3/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/028—Arrangements for the supply or exhaust of gaseous drying medium for direct heat transfer, e.g. perforated tubes, annular passages, burner arrangements, dust separation, combined direct and indirect heating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • C10B57/10—Drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases

Definitions

  • the invention relates to a method for drying and heating moist coal, in particular fine and very fine coal, in which the coal to be dried is supplied with heat via an inert gas circuit, which can be heated with the aid of a heat exchanger, and the dried and heated coal with a Partial circuit of the inert gas is protected from the entry of oxygen.
  • the invention also shows an apparatus for performing this method.
  • DE-A 28 10 694 shows a method of the type described in the introduction, in which fine-grained hard coal is pre-dried and further processed to high-quality hard coal coke.
  • the fine-shaped hard coal is dried in a drying device by means of a low-oxygen cycle gas, which essentially consists of water vapor.
  • Water vapor is used as the inert gas for the cycle, which develops when the coal to be dried is heated from the moisture that is carried in by the moist coal.
  • the inert gas circuit is indirectly heated by a heat exchanger.
  • the inert gas circuit must also be cleaned with a dedusting system, whereby the entrained coal particles must be separated.
  • a cyclone is used as the dedusting system, the low weight of the coal and the high fines content result in insufficient cleaning. In addition, the fine parts of the coal are also deposited on the heat exchanger and considerably impair the heat transfer. If, on the other hand, a cloth filter is used, temperature problems arise, particularly when starting up and shutting down the system. If the temperature of the inert gas in the cloth filter is too high, there is a risk that the filter cloths will burn. If, on the other hand, the temperature is too low, condensate forms and the carbon particles are deposited with the condensate on the filter cloths, so that the filter resistance increases.
  • the known method works on the countercurrent principle. This is disadvantageous insofar as the inert gas heated in the heat exchanger hits the already dried coal at the outlet of the drying system with its hottest temperature. Symptoms of overheating can occur here. In addition, the hot fines from the coal are taken in countercurrent. These migrate back to the entrance of the drying facility and can be deposited there again on the wet coal particles. This results in an accumulation of the fine particles in the drying device, so that their resistance increases. This affects the inert gas cycle.
  • DE-A 16 29 117 shows a method and a device for the gentle and accelerated drying of oxidation-sensitive substances, in which a preheated inert gas, preferably nitrogen, is used. Even in the presence of the dry material, the air in the system is to be displaced by spraying water vapor and the water vapor is to be discharged via condensers. To an equivalent extent, the inert gas, preferably nitrogen, should be blown into the space of the dryer which has been freed by the condensation of the water vapor. In this known system, a heater is used, from which it is not possible to see how it should work.
  • a preheated inert gas preferably nitrogen
  • DE-A 26 59 335 shows a coal drying and heating system that works with an entrained-flow dryer and a downstream entrained-current heater for the coal and in which a directly fired gas circuit is initially operated by the entrained-current heater and gas circuit, first by the entrained-current heater and then by the entrained-air dryer because it is conducted in direct current. Air in the form of combustion air is also introduced into the gas-operated combustion chamber, so that the oxygen content in the circuit of the heat transfer medium is difficult to control. In spite of vapor recirculation, deflagration phenomena and explosions cannot be avoided with this known coal heating system. The system also works with an electrostatic precipitator, whereby the coal separated there is added to the dried coal.
  • two short-circuit lines are arranged, both of which bridge the entrained-flow dryer and serve to raise or regulate the temperature in a cyclone separator and in the electrostatic filter.
  • the fan provided in the circuit of the heat transfer medium conveys in addition to the vapor return immediately into the electrostatic filter and then into the chimney, so that there is an additional risk that air at leaky points in the system and thus oxygen will get into the circuit of the heat transfer medium.
  • a limit value of 14% is known for thermal drying systems from the “Preparation Technology”, Issue 12, 1978, pages 581 to 586 (584). H. the maximum permissible oxygen content in the hot gas is limited to 14%. In order to reach this limit, it is recommended to first fill the system with steam and then inject water, which is to be gradually replaced by coal sludge to be dried. This method of operation is problematic in that the water vapor condenses in the cold system and the water subsequently injected only increases the amount of water or condensate. A reduction in the oxygen content to less than 2% is hardly conceivable in this way and is not even attempted according to the limit value of 14% recommended there.
  • the invention has for its object to develop the method of the type described in such a way that a system can be started up and shut down without the risk of deflagration, burns and explosions, the coal and the system is not damaged by overheating and a lowering of the temperature with the risk of condensation of water vapor is also avoided. Furthermore, the problems associated with dedusting and maintaining the filter effect must be solved in such a coal drying plant.
  • the method according to the invention is characterized in that during the start-up process before the introduction of moist coal in the system, air present in the circuit is heated and thereby heated via a heat exchanger that the parts of the system coming into contact with the circuit by means of the heated air circuit to condensation of water vapor avoiding temperature are warmed up before water is sprayed into the heated air circuit or water vapor is introduced and the air circuit is enriched with water vapor, the oxygen content being reduced below 2% and the inert gas circuit being formed before moist coal is dried in cocurrent for drying Inert gas circuit is introduced.
  • the air in the system with its known oxygen content is thus initially heated indirectly and without coal coming into contact with it, so that all system parts that come into contact with the air circuit are heated to such an extent that condensation of water vapor is avoided that will.
  • Water is sprayed into this heated air circuit, i.e. introduced in a very fine distribution with a large surface area, so that this water actually has the possibility of evaporating and thus causing an enrichment with water vapor without a substantial reduction in the temperature of the air circuit, as a result of which the oxygen content of the Recycle gas is lowered. This reduction can be carried out safely for the plant until the oxygen content in the cycle gas has dropped below 2% and the vast majority of the cycle gas is formed from water vapor.
  • the start-up process only takes a few minutes, it can also be operated without further ado that the oxygen content in the inert gas circuit is reduced to below 1% by enriching with water vapor before moist coal is introduced for drying.
  • the inert gas circuit is initially maintained until the last coal has left the plant; water is sprayed in or water vapor is introduced to avoid local overheating on the system.
  • the burner is switched off and then the inert gas is gradually replaced by air until the system has cooled to 80 ° C.
  • the device for carrying out the method has a drying device, an inert gas circuit which can be heated indirectly via a heat exchanger and which is passed once through the drying device and in a partial circuit via a mixer for dried coal, such as a dedusting device, in the inert gas circuit and a heat source connected to the heat exchanger on.
  • the drying device is a driven drying drum connected in direct current to the inert gas circuit, which is followed by a pre-separator and cooler as well as a cloth filter dedusting device in the inert gas circuit, and that the inert gas circuit has a shut-off supply line for water or water vapor and another lockable supply line for air having.
  • the gas circuit is also passed through the plant in direct current during the start-up process, that is in the same direction in which the coal to be dried is also guided during the operating phase of the plant.
  • This then has the advantage during the operating phase that depletion of the fine fractions of coal in the drying device is avoided.
  • a drying drum in a direct current process as a drying device, the coal is gently dried, the highest temperature of the inert gas circuit acting on the wet coal, so that overheating at the outlet of the drying drum on the dried coal is avoided and the temperature profiles can be controlled more easily and better.
  • the lockable supply line for water or steam and a further lockable supply line for air make a significant contribution to this.
  • the first line is used for the start-up process, while the further lockable supply line for air is required when the system is switched off.
  • the better controllability of the temperatures also makes it possible to use a pre-separator and cooler in the inert gas circuit, as well as a cloth filter dedusting device, which, when working dry, can achieve the required cleaning of the inert gases.
  • the inert gas circuit has two short-circuit lines, each provided with controllable shut-off devices, one of which is connected between the heat exchanger and the drying drum and leads into the line between the drying drum and the pre-separator and cooler, while the other branches off after the cloth filter dedusting and after the downstream fan and in front of the heat exchanger and bridges the heat exchanger. While the first short-circuit line is used to increase the temperature in the cloth filter dedusting, the second short-circuit line serves to lower the temperature in the cloth filter dedusting. It is understood that in this way the cloth filter dedusting can be carried out in an optimal temperature range, so that the temperature falls below the dew point and thus the formation of sulphurous acid and the condensation of water are avoided.
  • the upstream pre-separator and cooler can also be used to reduce the temperature in the cloth filter dedusting will.
  • the cooling device on the pre-separator expediently consists of several fans which can be switched on or off accordingly.
  • the partial circuit of the inert gas circuit intended to protect the dried coal branches off after the fan and is returned to the inert gas circuit, bridging the drum between the drying drum and the pre-separator and cooler.
  • the dried coal is thus effectively protected against the entry of atmospheric oxygen even after it has left the drying drum until it has been subjected to a desired processing.
  • a desired processing e.g. B. inert the material silo, the weighing and mixing device and the conveyor line of the coal. This can be done by depositing in a silo. It is also possible to coat the dried coal with a binder, preferably a bituninous binder, this is particularly useful if the coal is then to be coked.
  • a controllable shut-off device is arranged in the inert gas circuit in front of the heat exchanger and in front of the branching of one short-circuit line, as well as in the branching circuit.
  • These two shut-off devices control the quantity distribution of the inert gas for the inert gas circuit on the one hand and for the partial circuit on the other. It goes without saying that this quantity control can also influence the temperatures at the respective parts of the system.
  • a mixer, a weighing device and an intermediate silo can be provided in the partial circuit of the inert gas.
  • other devices for the dried coal can also be provided here, which are then expediently also included in the partial circuit, provided that the temperature of the dried coal is still in a dangerous range in such plant parts.
  • the lockable supply line for water or water vapor is expediently provided at the entrance to the drying drum.
  • all you need is a water supply line and a shut-off device, while the drying drum itself can be used to evaporate the water, as will happen later for the main purpose of the system, namely the drying of the coal.
  • the shut-off supply line for air is expediently connected to the inert gas circuit between the dust filter and the fan, so that here air is sucked in and mixed with the inert gas in a simple manner.
  • the temperature in the dedusting system is initially not reduced, so that no condensation can occur.
  • the heat exchanger connected to the inert gas circuit is, on the other hand, connected to a heating circuit which has an exhaust gas recirculation system in which a controllable shut-off element is provided.
  • a heating circuit which has an exhaust gas recirculation system in which a controllable shut-off element is provided.
  • the system also has a pre-separator and cooler 5, and a cloth filter dedusting device 6 connected downstream of this.
  • a fan 7 is provided downstream for circulating the heat transfer medium or the inert gas circuit and the partial circuit.
  • a heat exchanger8 is used for indirect heating of the inert gas circuit.
  • the heat exchanger 8, on the other hand, is connected to a heating circuit 9, 11 from the line sections 9 and 11, which ultimately leads to the exhaust stack 10.
  • a mixed gas fan 12 and a controllable shut-off device 13 are arranged in this line section 11.
  • a burner 14 is heated with gas or another medium which is drawn off via a line or a storage tank 15. The combustion air for the burner 14 is brought in via the air fan 16.
  • a return of the exhaust gases after passing through the heat exchanger and mixing in a mixing chamber 17 with the combustion exhaust gases can take place via the line section 11.
  • the inert gas circuit leads with a line 18 from heat exchanger 8 to the entrance to the drying drum 4. After passing through the drying drum4, the inert gas circuit is completed by the line sections 19, 20, 21, 22 and 23. As can be seen, the line piece 19 is connected between the output of the drying drum 4 and the input of the pre-separator and cooler 5, which, moreover, can be blown with cooling air by a blower (not shown) according to the arrows 24 and thus the temperature of the inert gas can be reduced.
  • the line piece 20 connects the outlet of the pre-separator and cooler 5 with the cloth filter dedusting 6; the output of which is connected to the blower 7 via the line piece 21.
  • the inert gas circuit 18 to 23 is formed from the line 18 and the line sections 19, 20, 21, 22 and 23.
  • two short-circuit lines 26 and 27 are provided, in which controllable shut-off organs ne 28 and 29 are arranged.
  • a feed line 30 for water or steam and a control device 31 which is required for start-up purposes.
  • the feed line 32 is required when the system is switched off.
  • the dried coal passes from the exit of the drying drum 4 via an encapsulated conveyor device 34 into a bucket elevator 35 and from there into an intermediate silo 36, from which it can be transferred in batches to a weighing device 37, from which the coal in turn reaches the mixer 38.
  • the coal can then finally be deposited in a silo 39 or be used for the corresponding purpose.
  • the mixer 38 it is possible to coat the dried coal with a binder, preferably a bituminous binder. This is fed from the binder tank 40 into the mixer 38 via the injection device 41.
  • the binder tank 40 is kept at the desired processing temperature by a thermal oil heating unit 42.
  • the partial circuit 43 to 47 formed from the line sections 43 to 47 branches off from the line section 22. This subcircuit 43 to 47 of the inert gas protects the dried coal and the relevant parts of the plant over which it is guided.
  • the short-circuit line 27 branches off from the line piece 23, but also the inert gas outlet line 48, in which the adjustable pressure relief valve 49 is provided and which ultimately leads to the exhaust gas chimney 10.
  • An overpressure is always maintained in the inert gas circuit 18 to 23 and in the partial circuit 43 to 47 via this pressure relief valve 49.
  • gas is continuously released to the exhaust gas chimney 10 via the pressure relief valve 49 both during the start-up phase and during the operation of the installation, because water vapor is continuously enriched by the water introduced or by the water carried in by the coal.
  • the pre-separator and cooler 5 as well as the cloth filter dedusting 6 are connected to the bucket elevator 35 via screw conveyors 50, so that the dry coal separated in the pre-separator 5 and the cloth filter dedusting 6 is added again to the dried coal brought up via the conveying line 34.
  • the fan 7, the drying drum 4 and various other system parts are started.
  • the heating circuit 9, 11 is then released by igniting the burner 14 for the development of heat, the associated system parts such as air fan 16 and mixed gas fan 12 also having to be switched on.
  • Heat is transferred to the air-filled circuit via the heat exchanger.
  • water is sprayed into the drying drum 4 by the control device 31 for water via the feed line 30. The water evaporates through the hot inlet gases. The resulting steam increases the amount of vapors in circulation.
  • the controllable overpressure valve 49 is made ready for opening so that it can discharge a partial gas flow into the exhaust gas stack 10.
  • the amount of water supplied is measured so that the water vapor produced is sufficient to reduce the oxygen content in the circulating vapors below 2%, preferably below 1%. This start-up process will take about 5 minutes.
  • the drying of the coal can then be started by switching on the material conveyor 2 and removing moist coal from the material silo 1 and feeding it to the drying drum 4 via the cellular wheel sluice 3. It goes without saying that at this point in time no more water is inserted via the feed line 30.
  • the moist coal to be dried reaches the material silo 1 in some way, for example with the aid of a shovel loader.
  • the material conveyor 2 is equipped with a direct current control drive.
  • the quantity discharged can be measured volumetrically by hand or set manually from a control center.
  • the amount of coal to be dried should be kept constant during operation.
  • the interior of the drying drum 4 is largely airtight against the environment. Above all, no atmospheric oxygen can penetrate, since the inert gas circuit 18 to 23 is operated at the sealing points of the drying drum under a corresponding excess pressure.
  • the temperature of the dried coal present at the end of the drying drum 4 is specified as a setpoint and compared in a controller. When the value falls below the setpoint, the shut-off device 25 on the pressure side of the fan 7 is opened, so that the amount of vapors in the inert gas circuit 18 to 23 is increased. If the target value of the temperature of the coal at the outlet of the drying drum 4 is exceeded, the amount of vapors is reduced by the control devices described above.
  • the entry temperature of the hot vapors into the drying drum 4 should be about 450 ° C. If the value falls below this target value, the gas supply to the burner 14 is increased. By introducing more energy, the exhaust gas temperature of the heating circuit 9, 11 increases, so that the temperature of the inert gas circuit 18 to 23 is raised via the heat exchanger 8. When the setpoint of the temperature of the heating circuit 9, 11 is exceeded at the entrance to the heat exchanger, which is approximately 1 100 ° C., the shut-off element 13 in the heating circuit 9, 11 is opened. As a result, an increased recirculation of the exhaust gases at approximately 300 ° C. is initiated, whereby the exhaust gas temperature in the mixing chamber 17 is reduced to the setpoint.
  • the fan 7 can, for example, be designed in such a way that it produces a total pressure difference of 70 mbar at 20 ° C., so that this pressure cannot be exceeded at any point in the inert gas circuit.
  • the vapors and the inert gas circuit are cleaned with the cloth filter dedusting device 6 and the upstream indirect pre-separator and cooler 5.
  • Two control circuits are required to protect the filter cloths from over and under temperature. If the specified setpoint temperature of z. B. 128 ° C in the line section 20, the first half of the cooling fans is switched on according to the arrows 24. If the temperature continues to rise and reaches z. B. 132 ° C, all cooling fans are turned on. Nevertheless, the temperature continues to rise and reaches z. B. 135 ° C, the gas supply in the burner 14 is switched off and the shut-off device 29 in the short-circuit line 27 is opened.
  • the temperature in the inert gas circuit 18 to 23 is lowered with certainty.
  • the temperatures specified above depend on the permissible temperature for the filter cloth used in each case. If the specified setpoint temperature of 115 ° C. on the line section 20 is undershot, the shut-off device 28 in the short-circuit line 26 is opened, the material conveyor 2 being switched off at the same time. As a result, the temperature in the pre-separator and cooler 5 and in the cloth filter dedusting 6 is raised again to such a value that critical conditions with regard to falling below the dew point cannot occur.
  • the dried coal present at the end of the drying drum 4 is conveyed into the intermediate silo 36 via the conveying device 34 and via a bucket elevator 35.
  • the coal which is also dry and separated in the pre-separator 5 and in the cloth filter dedusting 6, is fed via the conveyor screws 50.
  • the coal is removed from the intermediate silo 36 by means of cellular wheel locks and fed to the weighing device 37.
  • the cellular wheel sluices are switched off and the coal is introduced into the mixer38.
  • the binder is injected into the mixer 38 by the injection device 41.
  • the mixer opens and the dried coated material, namely the coal, falls into a silo 39 or is used for further use.
  • the partial circuit 43-47 made of inert gas protects the other parts of the system after the drying drum4 and the heated, dry coal contained in them.
  • the ratio of the inert gas, which is introduced into the inert gas circuit 18 to 23 after the fan 7, in relation to the amount of inert gas of the partial circuit 43 to 47 is achieved by the settings of the shut-off devices 25 and 51.
  • the material conveyor 2 is first stopped. Since the drying drum 4 no longer consumes as much heat, the temperature of the dry coal rises at the outlet of the drying drum. Likewise, the temperature of the inert gas in line piece 19 also rises. Water is now input into drying drum 4 via control device 31 for water. Even now, atmospheric oxygen is prevented from entering the system. After the mixing of the coal in the mixer 38 has ended, the water supply to the drying drum 4 is switched off and the air supply via the second feed line 32 is made possible by opening the shut-off device 33. The amount of vapors circulating increases further by sucking in air. Exhaust gas is continuously released into the exhaust stack 10 via the open pressure relief valve 49. The proportion of water vapor is now constantly decreasing, while the proportion of air is increasing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
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  • Organic Chemistry (AREA)
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Claims (11)

1. Procédé pour le séchage et le chauffage de charbon humide, en particulier de morceaux de charbon fins et très fins, dans lequel le charbon à sécher reçoit de la chaleur par l'intermédiaire d'un circuit de gaz inerte, qui peut être chauffé à l'aide d'un échangeur de chaleur et dans lequel le charbon séché et chauffé est protégé de la pénétration d'oxygène par un circuit partiel de gaz inerte, caractérisé en ce que, dans l'opération de démarrage, avant l'introduction de charbon humide, de l'air existant dans l'installation est mis en circuit et chauffé en même temps par l'intermédiaire d'un échangeur de chaleur, que les pièces de l'installation qui entrent en contact avec le circuit sont chauffées, au moyen du circuit d'air chauffé, à une température évitant la condensation de la vapeur d'eau, avant que de l'eau soit injectée ou de la vapeur d'eau introduite dans le circuit d'air chauffé et que le circuit d'air soit enrichi de vapeur d'eau, cependant que la part d'oxygène est abaissée en dessous de 2 % en volume et que le circuit de gaz inerte est ainsi formé, avant que du charbon humide soit introduit, pour séchage, dans le circuit de gaz inerte, dans le sens de ce circuit.
2. Procédé suivant la revendication 1, caractérisé en ce que, dans le circuit de gaz inerte, la part d'oxygène est abaissée au-dessous de 1 % par enrichissement avec de la vapeur d'eau, avant que du charbon humide soit amené au séchage.
3. Procédé suivant une quelconque des revendications 1 et 2, caractérisé en ce que, lors de l'arrêt de l'installation, le circuit de gaz inerte est d'abord maintenu jusqu'à ce que le dernier charbon ait quitté l'installation, et en outre de l'eau est injectée ou de la vapeur d'eau introduite, le brûleur est arrêté et ensuite le gaz inerte est remplacé progressivement par de l'air, jusqu'à ce que l'installation soit refroidie à 80 °C.
4. Dispositif pour la mise en oeuvre du procédé suivant les revendications 1 à 3, comportant une installation de séchage, un circuit de gaz inerte pouvant être chauffé indirectement par l'intermédiaire d'un échangeur de chaleur, ce circuit passant par l'installation de séchage et dans un circuit partiel, par l'intermédiaire d'un mélangeur pour du charbon séché, ainsi qu'une installation de dépoussiérage dans le circuit de gaz inerte et une source de chaleur raccordée à l'échangeur de chaleur, caractérisé en ce que l'installation de séchage est un tambour de séchage (4) entraîné, raccordé au circuit de gaz inerte (18 à 23) dans le sens de ce circuit, ce tambour étant suivi, dans le circuit de gaz inerte, par un séparateur préliminaire et refroidisseur (5) ainsi que par un filtre dépoussiéreur en toile (6) et que le circuit de gaz inerte comporte une conduite d'alimentation en eau ou en vapeur d'eau (30), susceptible d'être coupée ainsi qu'une autre conduite d'alimentation en air (32), susceptible d'être coupée.
5. Dispositif suivant la revendication 4, caractérisé en ce que le circuit de gaz inerte (18 à 23) comporte deux conduites de court-circuit (26, 27), munies chacune d'un organe d'arrêt (28, 29), l'une (26) étant branchée entre l'échangeur de chaleur (8) et le tambour de séchage (4) et menant dans la conduite (19), qui est entre le tambour (4) d'une part et le séparateur préliminaire et refroidisseur (5) d'autre part, tandis que l'autre (27) est dérivée après le filtre dépoussiéreur en toile (6) ainsi qu'après le ventilateur (7) monté en aval et avant l'échangeur de chaleur (8), cette conduite (27) shuntant l'échangeur de chaleur.
6. Dispositif suivant les revendications 4 et 5, caractérisé en ce que le circuit partiel (43 à 47) du circuit de gaz inerte, circuit partiel destiné à protéger le charbon séché, est dérivé après le ventilateur (7) et qu'il retourne dans le circuit de gaz inerte entre le tambour de séchage (4) et le séparateur préliminaire et refroidisseur (5), en shuntant le tambour (4).
7. Dispositif suivant la revendication 6, caractérisé en ce qu'à partir du ventilateur (7), il est disposé un organe d'arrêt commandé (25, 51) aussi bien dans le circuit de gaz inerte (18 à 23), avant l'échangeur de chaleur (8) et avant la dérivation d'une des conduites de court-circuit (27), que dans le circuit partiel de dérivation (43 à 47).
8. Dispositif suivant les revendications 6 et 7, caractérisé en ce que, dans le circuit partiel (43 à 47) de gaz inerte, il est prévu un mélangeur (38), une installation de pesée (37) et un silo intermédiaire (36).
9. Dispositif suivant la revendication 4, caractérisé en ce que la conduite d'alimentation en eau ou en vapeur d'eau (30), qui est susceptible d'être coupée, est prévue à l'entrée du tambour de séchage (4).
10. Dispositif suivant la revendication 4, caractérisé en ce que la conduite d'alimentation en air (32), susceptible d'être coupée, est raccordée entre le filtre dépoussiéreur en toile (6) et le ventilateur (7) au circuit de gaz inerte.
11. Dispositif suivant les revendications 4 et 5, caractérisé en ce que l'échangeur de chaleur (8), raccordé au circuit de gaz inerte (18 à 23), est relié d'autre part à un circuit de chauffage (9, 11), comportant un retour de gaz usés, dans lequel est prévu un organe d'arrêt (13) susceptible d'être commandé.
EP19800107653 1979-12-11 1980-12-05 Procédé et dispositif de séchage et de réchauffage de charbon humide Expired EP0030376B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792949720 DE2949720C2 (de) 1979-12-11 1979-12-11 Verfahren und Vorrichtung zum Trocknen und Erhitzen von feuchter Kohle
DE2949720 1979-12-11

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EP0030376A2 EP0030376A2 (fr) 1981-06-17
EP0030376A3 EP0030376A3 (en) 1981-08-19
EP0030376B1 true EP0030376B1 (fr) 1983-10-05

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EP19800107653 Expired EP0030376B1 (fr) 1979-12-11 1980-12-05 Procédé et dispositif de séchage et de réchauffage de charbon humide

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DE (1) DE2949720C2 (fr)

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* Cited by examiner, † Cited by third party
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DE3033461C2 (de) * 1980-09-05 1982-11-04 Alfelder Eisenwerke Carl Heise, KG vorm. Otto Wesselmann & Cie., 3220 Alfeld Verfahren zur Trocknung und Vorerhitzung von feinfkörniger Steinkohle unter Verwendung nicht oder nur schwach backender Kohle und/oder Kohlenstoffträgern
CN100443840C (zh) * 2006-09-20 2008-12-17 山东天力干燥设备有限公司 高挥发性煤粉回转干燥工艺
DE102007010070A1 (de) 2007-02-28 2008-09-04 Alba Ag Vorrichtung zur Behandlung von Hausmüll oder hausmüllähnlichem Abfall
LU91451B1 (en) * 2008-06-02 2009-12-03 Wurth Paul Sa Method for producing pulverized coal
LU91450B1 (en) 2008-06-02 2009-12-03 Wurth Paul Sa Method for producing pulverized coal
CN102564067A (zh) * 2010-12-10 2012-07-11 天华化工机械及自动化研究设计院 回转圆筒干燥机催化剂干燥的方法及其设备
CN102042743A (zh) * 2010-12-31 2011-05-04 中国神华能源股份有限公司 一种煤炭低温干燥脱水的方法
DE102012012417B4 (de) * 2012-06-25 2019-06-13 Thyssenkrupp Industrial Solutions Ag Verfahren und Vorrichtung zur verbesserten Vorerhitzung von Kohle durch Wärmetausch mit dem Kühlgas einer Kokstrockenkühlanlage
CN106871631B (zh) * 2017-04-10 2023-12-12 内蒙古东日新能源材料有限公司 一种精煤烘干搅拌设备与方法
CN112728925B (zh) * 2020-12-09 2022-05-20 华电电力科学研究院有限公司 一种大容量循环加热干燥系统及其加热干燥方法

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DE1629117A1 (de) * 1966-06-01 1971-01-21 Weizenin Dresden Veb Verfahren und Einrichtung zur schonenden und beschleunigten Trocknung von insbesondere oxydationsempfindlichen und thermolabilen Substanzen
DE2434827A1 (de) * 1973-08-06 1975-02-27 Waagner Biro Ag Verfahren zur energierueckgewinnung bei gaserzeugungsprozessen
DE2415758A1 (de) * 1974-04-01 1976-02-26 Buettner Schilde Haas Ag Anlage zur kohletrocknung und vorerhitzung
DE2435500A1 (de) * 1974-07-24 1976-02-12 Hugo Dr Ing Schaefer Verfahren zur vorerhitzung von kokskohle unter benutzung von ueberhitztem abhitzedampf, der in einer trockenkokskuehlanlage in besonderer weise erzeugt wird
US4008042A (en) * 1974-08-16 1977-02-15 Coaltek Associates Coal heating temperature control
DE2626653C3 (de) * 1976-06-15 1982-01-07 Bergwerksverband Gmbh Verfahren und Vorrichtung zum Trocknen und Vorerhitzen von Kokskohle
DE2633789C3 (de) * 1976-07-28 1980-08-14 Wintershall Ag, 3100 Celle Verfahren und Vorrichtung zur Herstellung von Petrolkokskalzinat
DE2656046A1 (de) * 1976-12-10 1978-06-29 Babcock Bsh Ag Verfahren und einrichtung zur steuerung der trocknungstemperatur, insbesondere bei duesenrohrtrocknern
DE2659335C2 (de) * 1976-12-29 1985-10-24 Bergwerksverband Gmbh Betrieb einer Kohleerhitzungsanlage
DE2748423A1 (de) * 1977-10-28 1979-05-03 Bergwerksverband Gmbh Verfahren zur inertisierung von kohleerhitzungsanlagen
DE2810694C2 (de) * 1978-03-11 1985-06-27 Alfelder Eisenwerke Carl Heise, KG vorm. Otto Wesselmann & Cie., 3220 Alfeld "Verfahren zur Vortrocknung von feinkörniger Steinkohle und zur Weiterverarbeitung zu hochwertigem Steinkohlenkoks"

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Publication number Publication date
EP0030376A3 (en) 1981-08-19
DE2949720C2 (de) 1982-08-26
DE2949720A1 (de) 1981-06-19
EP0030376A2 (fr) 1981-06-17

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