EP0370144B1 - Kohlefeuchtigkeitsregelverfahren - Google Patents

Kohlefeuchtigkeitsregelverfahren Download PDF

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Publication number
EP0370144B1
EP0370144B1 EP19880311041 EP88311041A EP0370144B1 EP 0370144 B1 EP0370144 B1 EP 0370144B1 EP 19880311041 EP19880311041 EP 19880311041 EP 88311041 A EP88311041 A EP 88311041A EP 0370144 B1 EP0370144 B1 EP 0370144B1
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EP
European Patent Office
Prior art keywords
coal
tube
tubes
control process
moisture control
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
Application number
EP19880311041
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English (en)
French (fr)
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EP0370144A1 (de
Inventor
Akira Nakamura
Keiichi Komai
Takeshi Wakabayashi
Huminobu Ono
Yoshiaki Hukunaga
Katsuhisa Matsuyama
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Mitsui Mining Co Ltd
Kawasaki Motors Ltd
Original Assignee
Mitsui Mining Co Ltd
Kawasaki Jukogyo KK
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Application filed by Mitsui Mining Co Ltd, Kawasaki Jukogyo KK filed Critical Mitsui Mining Co Ltd
Priority to DE19883879948 priority Critical patent/DE3879948T2/de
Publication of EP0370144A1 publication Critical patent/EP0370144A1/de
Application granted granted Critical
Publication of EP0370144B1 publication Critical patent/EP0370144B1/de
Anticipated expiration legal-status Critical
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    • 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
    • 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
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0404—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried
    • F26B11/0418—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried the subdivision consisting of a plurality of parallel tubes, e.g. through which the material to be dried is conveyed in single or multi-pass fashion
    • 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
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0404—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried
    • F26B11/0418—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried the subdivision consisting of a plurality of parallel tubes, e.g. through which the material to be dried is conveyed in single or multi-pass fashion
    • F26B11/0422—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried the subdivision consisting of a plurality of parallel tubes, e.g. through which the material to be dried is conveyed in single or multi-pass fashion the tubes having internal members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration

Definitions

  • This invention provides an efficient and economical coal-moisture control method by applying a tube dryer to high rank coal.
  • Tube dryers are constituted in such a manner that a plurality of tubes are axially disposed in an inclined rotary cylinder.
  • a heating medium such as steam is passed along the outer surface of the tube so that the coal to be dried is indirectly heated.
  • a heating medium such as steam is passed through a tube, while coal to be dried is passed along the outer surface of the tube so that it is indirectly heated.
  • coal-in-tube type of tube dryer has been used only for drying high water content brown coal (water content: 60 to 70 wt%) to a level of 20 to 30 wt%.
  • One such conventional tube dryer is known, in which a stirring means formed by a flat bar (width 20 to 30 mm) and designed in a spiral form is inserted into each tube.
  • the stirring means increase the probability that the coal is brought into contact with the inner surface (heat transfer surface) of the tube.
  • DE-C-611988 discloses a Schultz dryer, which is a coal-in-tube type tube dryer, for use in the drying of material, for example, of coal for briquetting.
  • Coal-in-tube type of tube dryers have been developed for drying brown coal and have not been used for high rank coal such as coking coal.
  • High rank coal such as coking coal contains only 10 to 20 wt% water even if the same is stocked in outdoor pile, and is thus lower in moisture than low rank coal such as brown coal. Since this high rank coal, when dried, becomes dustier as the moisture level is reduced, the water content of the coal is preferably dried to 4 to 7 wt% at the outlet portion of the dryer.
  • coking coal generally has lower flowability than brown coal.
  • the quantity of water to be evaporated can be limited to only 1/2 to 1/3 of that in the brown coal case, if the same amount of coal is used. Therefore, a necessity arises that the quantity to be treated should be increased by up to two to three times.
  • the conventional type of tube dryer can not treat a sufficient quantity of coal due to the flow resistance caused by the too small diameter of the tube thereof and the too complicated shape of the stirring means mounted in the space within the tubes.
  • a coal dryer disclosed in Japanese Patent Unexamined Publication No. 63-3089 is known, wherein austenitic acid-resisting stainless steel is used in the inlet portion thereof, an austenitic-ferric stainless steel is used in the intermediate portion thereof, and carbon steel is used in the outlet portion thereof.
  • the tube Since the structure of the steam-in-tube type tube tends to retain condensed water on the heat transferring surface, the tube needs to be made of a high grade material or the steam pressure needs to be raised, so as to keep the temperature of the shell high, both of these being uneconomical.
  • the invention provides a coal-moisture control process or a method for effectively controlling the moisture in coal of the type having a relatively high coal rank, such as coking coal, in which method a tube dryer is used, such tube dryer being so constituted that the coal or the like to be dried is passed through the tube inside, while any heating medium is passed outside this tube.
  • the inventors have found through experiments that the kiln action can be stably generated by arranging the average charge ratio in the tube to be 15% or more, preferably, to be 30 to 50%. As a result, a sufficient retention time in the tube can be secured and the heat transfer quantity can be improved.
  • the inventors have also achieved the present invention based on the finding that corrosion at the time of treatment of coking coal can be prevented and sufficient corrosion resistance can be obtained in the case of a low grade material such as carbon steel SGP by arranging the steam temperature in the tube dryer to be 130°C or higher, and the tube wall temperature (inner surface temperature) to be 120°C or higher, preferably 130°C or higher.
  • An object of the present invention is to provide a coal-moisture control process whereby a treatment quantity can be increased, with a necessary drying capability being maintained, by using a tube dryer of a coal-in-tube type, which type has been used previously only for drying coal having a high water content, such as brown coal, the tubes preferably being constituted in such a manner that they have a diameter twice to three times of that of the conventional tubes, and, preferably, the stirring means in this tube being omitted or the configuration thereof being simplified.
  • Another object of the present invention is to provide a coal-moisture control process in which the generation of corrosion can be prevented even in the case of general carbon steel by means of controlling (increasing) the number of revolutions of a tube dryer, maintaining the steam temperature at a high temperature exceeding 130°C with the coal drying capability maintained, and securing the tube wall temperature above 120°C, preferably 130°C or higher, that is, above the corrosion temperature region.
  • the present invention provides a coal-moisture control process comprising introducing a mono species or a mixture of several species of coal containing 45 wt% or less on a dry ash free basis of volatile matter, having 75 wt% or more of particles of a size of 3 mm or less, and having a water content of 20 wt% or less on a wet ash free basis into a plurality of tubes disposed in and along an axial direction of an inclined rotational cylinder of a tube dryer, the tubes each having an inner diameter of 150 mm or more, so controlling the ratio of a coal layer with respect to a cross-sectional area of said tubes that it is from 15 to 40% on average, and passing a heating medium, for example, steam along the outer surfaces of said tubes for the purpose of indirectly heating said coal so as to dry it so that the water content on the wet ash free basis is made 4 to 7 wt%.
  • a heating medium for example, steam along the outer surfaces of said tubes for the purpose of indirectly heating said coal so as to dry it
  • the invention further provides a coal-moisture control process comprising introducing a mono species or a mixture of several species of coal containing 45 wt% or less on a dry ash free basis of volatile matter, having 75 wt% or more of particles of a size of 3 mm or less, and having a water content of 20 wt% or less on a wet ash free basis into a plurality of tubes disposed in and along an axial direction of an inclined rotational cylinder of a tube dryer, the tubes each having an inner diameter of 150 mm or more, passing a heating medium, for example, steam along the outer surfaces of said tubes for the purpose of indirectly heating said coal so as to dry it, the conditions being such that the temperature of a tube shell is 120°C or higher, and so controlling the rotational speed of said tube dryer that the coal is dried to a water content of 4 to 7 wt%.
  • a heating medium for example, steam along the outer surfaces of said tubes for the purpose of indirectly heating said coal so as to dry it
  • the invention provides a coal-moisture control process comprising introducing a mono species or a mixture of several species of coal containing 45 wt% or less on a dry ash free basis of volatile matter, having 75 wt% or more of particles of a size of 3 mm or less, and having a water content of 20 wt% or less on a wet ash free basis into a plurality of tubes disposed in and along an axial direction of an inclined rotational cylinder of a tube dryer, the tubes each having an inner diameter of 150 mm or more, so controlling the ratio of a coal layer with respect to a cross-sectional area of said tubes that said ratio is 50% or more at an inlet portion of said tubes, and passing a heating medium, for example, steam along the outer surfaces of said tubes for the purpose of indirectly heating said coal so as to dry it so that the water content on the wet ash free basis is made 4 to 7 wt%.
  • a heating medium for example, steam along the outer surfaces of said tubes for the purpose of indirectly heating said coal
  • the ratio of the coal layer with respect to the cross-sectional area of the tube is below 15%, the kiln action cannot be generated. Therefore, the area contacting with the inner surface (heat transfer surface) of the tube is too small and the coal layer cannot be stirred sufficiently, causing the heat transfer efficiency to be limited to low, while the flow velocity in the tube becomes too large with respect to that in the case where the kiln action is generated. That is disadvantageous because the length of tube needed for the coal to be dried sufficiently may become excessive.
  • the charge ratio or proportion of the coal layer at the inlet portion of the tube should be 50% or more in the case of coals having the water contents specified above, although depending upon the water content in the coal.
  • the charge ratio exceeds 50%, in average the flow velocity of coal is reduced, causing the flow to become unstable. As a result of this, the tube may be clogged or a non-uniform distribution of the charge ratio occurs. Therefore, the charge ratio is preferably limited so that it does not exceed 50% even locally, except at the inlet portion, and the average charge ratio is preferably limited to 40% or less.
  • the ratio of the quantity of the coal with respect to the cross-sectional area of the tube is controlled, by reducing the rotational speed of the tube dryer near its lowermost level, by monitoring the level of fine particles of said coal in an inlet hood of the tube dryer so as to prevent a rise in the fine particles level as well as by monitoring the quantity of said coal discharged from the tube dryer so as to prevent reduction in said quantity of the coal discharged from said tube dryer, and that the quantity of supply of the coal to be dried to the tube dryer is controlled at a substantially constant level.
  • a mono species or a mixture of several species of coal, to be dried, containing 45 wt% or less on a dry ash free basis of volatile matter, 75% or more of particles of a size of 3 mm or less, and having a water content of 20 wt% or less on a wet ash free basis is introduced into a plurality of tubes disposed along the axial direction of an inclined rotational cylinder of a tube dryer having stirring means inserted into the tubes, a heating medium such as steam is passed along the outer surface of the tubes for the purpose of indirectly heating the coal so as to dry it so that the water content on the wet ash free basis is made 4 to 7 wt%.
  • the stirring means may preferably be formed by a spiral wire material (shown in Figs. 1 to 3), by a structure (shown in Figs. 4 and 5) in which a plurality of annular dams in the transverse direction of the tube are disposed at regular intervals, or by a structure (shown in Figs. 6 and 7) in which a plurality of flat-bars are disposed in axial direction of the tube in such a manner that they can be in contact with the inner surface of the tube.
  • the rotation speed of the tube dryer is preferably controlled so as to make the temperature of the heating medium such as steam in the tube dryer exceed 130°C.
  • the tube shell temperature may be made 120°C or higher instead of making the temperature of the heating medium such as steam in the tube dryer 130°C or higher.
  • the temperature of the tube shell (the temperature of the inner surface) may be raised to 120°C or higher.
  • the temperature of the tube wall there is no industrially convenient method to measure the temperature of the tube wall in the rotating dryer, and if any, it has a poor reliability. Since the pressure of steam is uniform through the inside of the dryer of a coal-in-tube type tube dryer and the temperature drop inside the tube shell is limited to a very small level, the temperature of steam at the inlet portion of the dryer at which measurement can be performed rather easily may be measured for the control as an alternative to measuring the tube shell temperature. Since the generated condensed water is immediately separated from the tube shell and is discharged from the dryer, the temperature of the same is substantially the same as that of the steam in the dryer. Therefore the temperature of the condensate at the outlet portion of the dryer may be measured so as to use it to perform control.
  • the revolution speed of the dryer may be controlled so as to bring the water content in the coal at the outlet portion to a predetermined level.
  • the content of the volatile matter of the coking coal on a dry ash free basis may be 45 wt% or less but is preferably to be 30 wt% or less.
  • the water content of the same on a wet ash free basis may be 20 wt% or less but is preferred to be 8 to 12 wt% in average.
  • the inclination of the inclined rotational cylinder is preferred to be 5 to 15°. If it is below 5°, the coal flow velocity in the tube is too small, causing the quantity treated to become also too small, while the retention time becomes longer. As a result of this, the coal at the outlet portion becomes over-dry. If an inclined rotational cylinder of an inclination of 5° or less is used for processing the coal of the above described water content range, the dryer needs to be a cylinder having a large diameter but having a short overall length. Such dryer causes manufacturing and transportation problems. Raising the rotational speed for the purpose of increasing the quantity of the coal to be treated will cause a problem to be described later. On the other hand, if it exceeds 15°, the size of the supporting device such as a stopper for supporting a thruster or a shaft bearing portion in the axial direction of the dryer becomes too large, causing manufacturing and economical problems.
  • the rotational speed of the inclined rotational cylinder is 5 to 25 rpm, the diameter to be 600 to 6000 mm, and the number of the tubes to be six or more. If the rotational speed is less than 5 rpm, similarly to the case where the inclination is 5° or less, the quantity treated by a tube becomes too small, causing the problem that the shape of the dryer becomes a cylinder of large diameter and short length. On the other hand, if it exceeds 25 rpm, the life of the rotational portions such as the bearing or the like can be shortened and the power needed becomes too large. In addition, the tube disposed away from the rotation shaft is much affected by centrifugal force, which has the result that generation of the kiln action is prevented.
  • the inner diameter of the tube is less than 150 mm, the quantity treated by one tube may be excessively low, and the retention time becomes long, causing the drying capability to become excessively high. Therefore, such dryer causes much more serious manufacturing and transportation problems relative to the case where the inclination is 5° or less.
  • the diameter of the cylinder is less than 600 mm, it is difficult to dispose in it a plurality of tubes having an inner diameter of 150 mm. If it exceeds 6000 mm manufacturing and transportation problems occur, and the excessive number of the tubes to be disposed therein makes it difficult for coal to be uniformly supplied into the tubes.
  • the number of the tubes is less than five, a proportion or ratio of the total cross-sectional areas of the tubes with respect to the cross-sectional area of the dryer, that is, the ratio of the coal passage with respect to the diameter of the dryer, is lowered, causing an economical problem.
  • Fig. 1 shows an example of a dryer in which the method according to an embodiment of the present invention is carried out.
  • Reference numeral 10 represents an inclined rotational cylinder which is designed to be able to be rotated around the axis thereof by a driving means (omitted from the illustration).
  • This inclined rotational cylinder 10 is disposed in such a manner that it is downward inclined by approximately 10° when viewed from the coal supplying side.
  • the material to be dried such as coal is supplied to an inlet hood 11, and is dried by a heating medium flowing outside a plurality of tubes 1, at which the same is heat-exchanged through the walls of the tubes 1 while the coal passes through the tubes 1. Lastly, dried coal is discharged from the outlet end of the tubes 1.
  • the tubes 1 are disposed between tube plates 3 at both ends of the inclined rotational cylinder 10.
  • the heating medium such as steam under pressure of several atmospheres, is supplied into the cylinder 10 via a rotational coupling 12, and flows to the bottom and downstream portion of the cylinder 10 after it has heated the outside of the tube 1 and has been condensed. Then, it passes through a drain pipe 13 in accordance with rotation of the cylinder 10, and is discharged through a rotational coupling 14.
  • the drying efficiency can be improved by employing the following means.
  • the diameter of the tube 1 is preferably designed to be 150 to 300 mm for the purpose of increasing the quantity treated although the diameter is substantially 100 mm in the case of the tube for brown coal.
  • the rotational speed of the tube dryer is adjusted and the coal charge ratio in the tube may be arranged to be 15 to 40% for the purpose of stabilizing generation of kiln action. If the quantity treated is relatively small, the heat transfer area becomes relatively large. Therefore, the water content in the coal at the outlet portion is controlled by lowering the quantity (pressure) of the heating medium to be supplied.
  • a stirring means 16 constituted by spiral steel bars 15 having circular cross section into the tube, the kiln action can be generated at the layer of the coal to be dried, causing the heat conducting efficiency to be improved. Furthermore, the flow velocity of coal along the axial direction of the tube 1 is restricted so as to secure the retention time for the purpose of further improving treatment capability.
  • This stirring means 16 is so constituted that it is prevented from separation from the tube by means of a stopper 17 disposed at the outlet end portion of the tube 1, but it can be freely rotated within tube 1.
  • Reference numeral 18 represents a passage through which the heating medium passes
  • reference numeral 20 represents a hopper for separating the dried coal from the exhaust gas (composed or consisting of evaporated water and air) and for taking out the same.
  • the stirring means 16 As the coal to be dried moves forward through the tube 1, water content thereof is reduced, causing generally the flow velocity to be raised. Therefore, the charge ratio of the coal to be dried in the tube becomes lower and this leads to the fact that the kiln action becomes less likely to be generated.
  • the stirring means 16 By using the stirring means 16 according to the present invention, however, the kiln action can be maintained even in the case where the coal has low water content and the charge ratio is low. Therefore, a sufficient coal-moisture controlling capability and drying capacity can be maintained. It is sufficient that the length of the stirring means 16 along the tube 1 is, depending upon the physical properties of the coal to be dried, inserted in the downstream half portion of the tube in the case of a coking coal.
  • the diameter of the spiral needs to be half or more of the inner diameter of the tube 1.
  • the pitch for the spiral is preferred to be 1/4 times to twice of the diameter of the tube 1.
  • the stirring means 16 may not be rotated within the tube, and the same may be fixed to the stopper 17 or the
  • annular or ring-like plates 21 spaced from each other at a several hundred milli-meters pitch by spacers 22 made of steel bars may be inserted in the tube 1.
  • the size of the annular plate 21 is preferably smaller that the diameter of the tube 1 and it is able to rotate for the purpose of preventing adhesion and accumulation of the coal to be dried. It is insufficient to have only one sheet of annular plate 21 at the downstream end for the stable generation of the kiln action. Therefore, two or more plates 21 are desired.
  • the remaining structure and the operation are the same as the case shown in Figs. 1 to 3.
  • stirring means 16 shown in Figs. 1 to 3 In another example, as an alternative to the stirring means 16 shown in Figs. 1 to 3, several flat bars 23 are laid in the axial direction, with the same positioned in close contact with the inner surface of the tube 1, and are secured by a steel bar 24 having a circular cross section to form a stirring means, as shown in Figs. 6 and 7, the thus-secured stirring means being inserted into the tube 1.
  • the stirring means in Figs. 6 and 7 is so constituted that, in contrast to the conventional example shown in Figs. 9 and 10 in which the material to be dried is picked up by itself, the base portion of the fine particle layer is supported for the purpose of assisting generation of the kiln action.
  • the width of the flat bar 23 can be limited small and the number of the same may be, for example, two or three. Furthermore, only a few of the steel bars 24 may be provided. Therefore, the flow rate is scarcely reduced. The remaining structure and the operation are the same as those shown in Figs. 1 to 3.
  • the pressure of the steam to be supplied is, in proportion to the water content in the coal at the outlet portion, controlled by a control valve 25 or the like.
  • the control valve 25 is controlled to keep the steam at the predetermined temperature, and simultaneously the rotational speed of the dryer is controlled by using an inverter 27 for a driving motor 26 for the purpose of bringing the water content in the coal at the outlet portion to a predetermined level.
  • Reference numeral 28 represents a water content detector
  • reference numeral 29 represents a temperature detector
  • reference numeral 30 represents a rotational-speed adjuster
  • reference numeral 31 represents a rotation drive shaft
  • reference numeral 32 represents a bearing.
  • a coal-in-tube type of tube dryer which has been hitherto used only for brown coal, is used for the purpose of performing coal-moisture control of coal having a relatively high coal rank such as coking coal.
  • the coal-moisture control can be more efficiently and economically performed than in the case of the other type of tube dryers and other types of drying method.
  • tube corrosion can be prevented and tubes can be made from low-cost materials, so that the coal-moisture control process can be performed efficiently and economically, by way of controlling the temperature of the heating medium such as steam in the tube dryer above or no less than 130°C, or making the temperature at the inner surface of the tube above or no less than 120°C.
  • the heating medium such as steam in the tube dryer above or no less than 130°C, or making the temperature at the inner surface of the tube above or no less than 120°C.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Drying Of Solid Materials (AREA)

Claims (11)

  1. Kohlefeuchtigkeit-Einstellprozeß, der folgendes aufweist: Einleiten einer einzigen Sorte oder einer Mischung mehrerer Sorten von Kohle mit 45 Gew.% oder weniger auf trockener, aschefreier Basis an flüchtigen Substanzen, mit 75 Gew.% oder mehr an Teilchen einer Größe von 3 mm oder weniger und einem Wassergehalt von 20 Gew.% oder weniger auf nasser, aschefreier Basis in mehrere Rohre, die in und entlang der axialen Richtung eines geneigten Drehzylinders eines Rohrtrockners angeordnet sind, wobei jedes der Rohre einen Innendurchmesser von 150 mm oder mehr aufweist, Einstellen des Verhältnisses einer Kohleschicht in bezug auf die Querschnittsfläche der Rohre in solcher Weise, daß es im Mittel zwischen 15 und 40 % liegt, und Durchleiten eines Heizmediums, z.B. Dampf, entlang den Außenflächen der Rohre zum Zweck des indirekten Beheizens der Kohle, um diese so zu trocknen, daß der Wassergehalt auf nasser, aschefreier Basis 4 bis 7 Gew.% beträgt.
  2. Einleiten einer einzigen Sorte oder einer Mischung mehrerer Sorten von Kohle mit 45 Gew.% oder weniger auf trockener, aschefreier Basis an flüchtigen Substanzen, mit 75 Gew.% oder mehr an Teilchen einer Größe von 3 mm oder weniger und einem Wassergehalt von 20 Gew.% oder weniger auf nasser, aschefreier Basis in mehrere Rohre, die in und entlang der axialen Richtung eines geneigten Drehzylinders eines Rohrtrockners angeordnet sind, wobei jedes der Rohre einen Innendurchmesser von 150 mm oder mehr aufweist, Durchleiten eines Heizmediums, z.B. Dampf entlang den Außenflächen der Rohre zum Zweck des indirekten Beheizens der Kohle, um diese zu trocknen, wobei die Bedingungen derartige sind, daß die Temperatur eines Rohrmantels 120° C oder höher ist und die Drehzahl des Rohrtrockners so eingestellt wird, daß die Kohle bis auf einen Wassergehalt von 4 bis 7 Gew.% getrocknet wird.
  3. Kohlefeuchtigkeit-Einstellprozeß nach Anspruch 1 oder Anspruch 2, bei dem die Kohle durch in den Rohren enthaltene Rühreinrichtungen gerührt wird.
  4. Kohlefeuchtigkeit-Einstellprozeß nach Anspruch 3, bei dem die Rühreinrichtung durch spiralförmige Drähte gebildet wird.
  5. Kohlefeuchtigkeit-Einstellprozeß nach Anspruch 3, bei dem die Rühreinrichtung mehrere querverlaufende, ringförmige Überläufe aufweist, die voneinander entlang der Längsrichtung des Rohrs beabstandet sind.
  6. Kohlefeuchtigkeit-Einstellprozeß gemäß Anspruch 3, bei dem die Rühreinrichtung mehrere flache Stangen aufweist, die entlang der axialen Richtung der Rohre in Berührung mit der Innenfläche des Rohrs angeordnet sind.
  7. Kohlefeuchtigkeit-Einstellprozeß nach einem der Ansprüche 1 bis 6, bei dem die zu trocknende Kohle Backkohle enthält.
  8. Kohlefeuchtigkeit-Einstellprozeß, der folgendes aufweist: Einleiten einer einzigen Sorte oder einer Mischung mehrerer Sorten von Kohle mit 45 Gew.% oder weniger auf trockener, aschefreier Basis an flüchtigen Substanzen, mit 75 Gew.% oder mehr an Teilchen einer Größe von 3 mm oder weniger und einem Wassergehalt von 20 Gew.% oder weniger auf nasser, aschefreier Basis in mehrere Rohre, die in und entlang der axialen Richtung eines geneigten Drehzylinders eines Rohrtrockners angeordnet sind, wobei jedes der Rohre einen Innendurchmesser von 150 mm oder mehr aufweist, Einstellen des Verhältnisses einer Kohleschicht in bezug auf die Querschnittsfläche der Rohre in solcher Weise, daß es am Einlaßabschnitt der Rohre 50 % oder mehr beträgt, und Durchleiten eines Heizmediums, z.B. Dampf, entlang den Außenflächen der Rohre zum Zweck des indirekten Beheizens der Kohle, um diese so zu trocknen, daß der Wassergehalt auf nasser, aschefreier Basis 4 bis 7 Gew.% beträgt.
  9. Kohlefeuchtigkeit-Einstellprozeß nach Anspruch 1 oder Anspruch 8, bei dem das Verhältnis der Kohlemenge in bezug auf die Querschnittsfläche des Rohrs dadurch eingestellt wird, daß die Drehzahl des Rohrtrockners nahe ihrem untersten Wert dadurch erniedrigt wird, daß die Menge feiner Teilchen der Kohle in einer Einlaßhaube des Rohrtrockners überwacht wird, um einen Anstieg der Menge feiner Teilchen zu verhindern, wie auch dadurch, daß die Menge der aus dem Rohrtrockner entladenen Kohle überwacht wird, um ein Verringern dieser aus dem Rohrtrockner entladenen Kohlemenge zu verhindern, und daß die Menge zu trocknender Kohle, die dem Trockner zugeführt wird, auf einen im wesentlichen konstanten Wert eingestellt wird.
  10. Kohlefeuchtigkeit-Einstellprozeß nach einem der Ansprüche 2 bis 7, bei dem die Temperatur des Heizmediums, wie Dampf, im Rohrtrockner 130° C oder mehr beträgt.
  11. Kohlefeuchtigkeit-Einstellprozeß nach Anspruch 2 oder Anspruch 8, bei dem das Verhältnis einer Kohleschicht in bezug auf die Querschnittsfläche der Rohre so eingestellt wird, daß es im Mittel 15 bis 40 Prozent beträgt.
EP19880311041 1987-09-03 1988-11-22 Kohlefeuchtigkeitsregelverfahren Expired - Lifetime EP0370144B1 (de)

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IL97699A0 (en) * 1990-09-24 1992-06-21 Gaehler Franz Method and apparatus for reprocessing loose materials
DE4121873A1 (de) * 1991-07-02 1993-01-14 Braunschweigische Masch Bau Verdampfungstrockner fuer faseriges, insbesondere abgepresstes gut, insbesondere zuckerruebenschnitzel
JPH0620446U (ja) * 1992-03-31 1994-03-18 川崎重工業株式会社 コール・イン・チューブドライヤ
JP2515070Y2 (ja) * 1993-01-18 1996-10-23 川崎重工業株式会社 コール・イン・チューブ・ドライヤ
JP4653545B2 (ja) * 2005-04-08 2011-03-16 新日鉄エンジニアリング株式会社 流動層乾燥機及び流動層乾燥機による湿潤原料の乾燥方法
JP4858322B2 (ja) * 2007-06-14 2012-01-18 Ｊｆｅエンジニアリング株式会社 乾燥装置
RU2379329C2 (ru) * 2007-10-17 2010-01-20 Научно-техническая горная ассоциация (НТГА) Способ сушки продуктов обогащения углей
JP5081288B2 (ja) * 2010-10-25 2012-11-28 新日鉄エンジニアリング株式会社 流動層乾燥機及び流動層乾燥機による湿潤原料の乾燥方法
JP5535112B2 (ja) * 2011-03-25 2014-07-02 月島機械株式会社 石炭火力発電設備及び石炭火力発電方法
JP2015055375A (ja) * 2013-09-10 2015-03-23 周南バルクターミナル株式会社 発電方法
CN103591779B (zh) * 2013-11-20 2015-10-07 韩旭新 褐煤管式干燥机
JP6245743B2 (ja) 2013-12-06 2017-12-20 三菱重工業株式会社 石炭不活性化処理装置
CN105157371A (zh) * 2015-07-13 2015-12-16 华北电力大学 一种烟气-蒸汽一体化的转筒式原煤干燥设备
DE102016213956B4 (de) * 2016-07-28 2024-09-26 Floradry Gmbh Kontakttrockner
CN107314644A (zh) * 2017-08-10 2017-11-03 阜阳华润电力有限公司 一种煤泥干燥机
CN109654527B (zh) * 2018-12-10 2020-05-05 安徽金禾实业股份有限公司 一种三废混燃炉均匀给煤装置
CN115388625B (zh) * 2022-08-30 2023-06-13 湖南越洋药业有限公司 一种应用于甲泼尼龙生产的反冲旋转式烘干设备

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DE3879948T2 (de) 1993-07-01
EP0370144A1 (de) 1990-05-30
JPH0759709B2 (ja) 1995-06-28
JPH01230916A (ja) 1989-09-14
DE3879948D1 (de) 1993-05-06

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