WO2016163044A1 - 横型回転式乾燥機による乾燥方法及び乾燥システム - Google Patents

横型回転式乾燥機による乾燥方法及び乾燥システム Download PDF

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Publication number
WO2016163044A1
WO2016163044A1 PCT/JP2015/076768 JP2015076768W WO2016163044A1 WO 2016163044 A1 WO2016163044 A1 WO 2016163044A1 JP 2015076768 W JP2015076768 W JP 2015076768W WO 2016163044 A1 WO2016163044 A1 WO 2016163044A1
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WO
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Prior art keywords
end side
heating
rotating cylinder
processed
carrier gas
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Application number
PCT/JP2015/076768
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English (en)
French (fr)
Japanese (ja)
Inventor
正康 伊藤
善二 加藤
渡辺　健司
諏訪　聡
Original Assignee
月島機械株式会社
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Priority to KR1020177006957A priority Critical patent/KR102384141B1/ko
Publication of WO2016163044A1 publication Critical patent/WO2016163044A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/30—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotary or oscillating containers; with movement performed by rotary floors
    • F26B17/32—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotary or oscillating containers; with movement performed by rotary floors the movement being in a horizontal or slightly inclined plane

Definitions

  • the present invention relates to a drying method and a drying system using a horizontal rotary dryer.
  • STD Steam dryers
  • Patent Document 1 Call-in tubes
  • rotary kilns rotary kilns, and the like are frequently used as dryers for drying workpieces such as coal and ore.
  • Coal and ore are used as raw materials for steelmaking and refining, fuel for power generation, etc., and since these are required to be processed stably and in large quantities, each of the above dryers is adopted as a dryer that meets this requirement. Has been.
  • STD indirectly heats the object to be treated, it has high thermal efficiency and a large amount of treatment per unit volume. Moreover, since the size can be increased, it is suitable for the demand for mass processing.
  • the call-in tube also indirectly heats the object to be processed, so that the heat efficiency is high and the processing amount per unit volume is large as in the case of the STD.
  • the processing amount per unit volume is large as in the case of the STD.
  • Rotary kilns have the disadvantage of poor thermal efficiency compared to indirect heating because they are dried directly by applying hot air to the workpiece.
  • the exhaust treatment facility becomes very large. For this reason, STD has an advantage as a dryer for processing a large amount of objects to be processed.
  • the transport system of the object to be processed and the dried object, such as STD is made of N 2 gas or the like. Measures are taken to prevent oxygen contamination by filling with an inert carrier gas. Also, water or volatiles vapor splashed with heating operation, N 2 inert gas such as gas, use circulating so as not to dew point, the water or volatiles in the circulation system to the outside of the system by condensed The inert gas such as N 2 gas itself is circulated and used.
  • the necessary circulation amount of the inert gas depends on the scale of the facility, but in a large facility, the fan and duct of the circulation line are also enlarged, resulting in an increase in power consumption and facility cost.
  • the gas temperature is often used at 20 to 50 ° C. In order to reduce the capacity of the wet gas in the circulation system, it is necessary to reduce the capacity of the circulating inert gas.
  • the problem can be solved theoretically by raising the exhaust gas temperature from the dryer flowing into the condenser and increasing the dew point.
  • dew condensation due to heat dissipation or the like becomes a problem due to the limitation of the product temperature (to prevent dew condensation on the surface of the workpiece) and the saturated gas.
  • the filling rate of the object to be processed is large, the filling part is overheated, and if the cooling on the gas side and the movement of the evaporated vapor are small, the dew point increases and condensation occurs on the discharge side.
  • Such a dew condensation state often needs to be extremely avoided depending on the type of dry matter, and examples thereof include coal and certain resin raw materials.
  • a main object of the present invention is to provide a drying method using a horizontal rotary dryer capable of reducing the amount of carrier gas while preventing condensation.
  • a supply port for the object to be processed is provided on one end side, and a discharge port for the object to be processed is provided on the other end side.
  • a rotating cylinder rotatable around the axis and a number of heating tubes through which a heating medium passes are provided in the rotating cylinder.
  • the drying method according to the present invention further satisfies the conditions that the temperature of the discharged dried product is 95 ° C. or higher and the temperature on the discharge side of the carrier gas is 95 ° C. or higher.
  • the system of the present invention is as follows.
  • a supply port for the object to be processed is provided on one end side, and a discharge port for the object to be processed is provided on the other end side.
  • a rotating cylinder rotatable around the axis and a number of heating tubes through which a heating medium passes are provided in the rotating cylinder.
  • the horizontal rotary dryer for heating and drying the object to be processed by the heating tube in the process of supplying the object to be processed to one end side of the rotating cylinder and discharging from the other end side, Satisfy all of the following conditions: (1) Means for circulating an inert carrier gas in the rotating cylinder from the one end side to the other end side in a cocurrent manner, (2) A heating means for heating the carrier gas provided on the other end side, A drying system using a horizontal rotary dryer.
  • a heating trace provided on the other end of the rotating cylinder can be used.
  • the heating means a jacket structure in which a heating medium provided on the other end side of the rotating cylinder is circulated can be used.
  • the heating means can be a fin provided on the other end side of the heating tube.
  • Condensation is a problem mainly on the discharge side (the other end side of the rotating cylinder).
  • the parallel flow system which distribute
  • the carrier gas temperature is about 20 to 40 ° C., so that the exhaust temperature becomes low, and the evaporation at the inlet of the object to be processed is condensed and adheres to the object to be dried.
  • the exhaust gas temperature and the product temperature can be increased even with a small amount of carrier gas.
  • the product temperature of the discharged dried product is 95 ° C. or higher, preferably 97 ° C. or higher, more desirably 99 ° C. or higher
  • the temperature on the discharge side of the carrier gas is 95 ° C. or higher, preferably 97 ° C.
  • the temperature is more preferably 99 ° C. or more, so that condensation is unlikely to occur.
  • the carrier gas amount can be reduced by setting the dew point of the carrier gas to 95 ° C. or higher under these conditions, but on the other hand, the dew point is about 97 ° C. It becomes. Therefore, condensation can be prevented by providing a heating means for heating the carrier gas on the other end side to increase the exhaust gas temperature.
  • Table 1 shows a part of the absolute humidity table.
  • the amount of water vapor xs contained in 1 kg of dry air in this table increases with an increase in temperature t.
  • the amount of water vapor xs is 1000 g / kg at 87 ° C., but about 3 at 95 ° C. .1 times, about 5.5 times at 97 ° C. and about 17 times at 99 ° C. This means that when the temperature is increased, more steam can be included in a certain air volume, and the included amount becomes significantly higher at 95 ° C. or higher.
  • the air flow rate of carrier gas and the product temperature of the discharged dry matter are determined based on the water vapor amount xs (g / kg) in the range of 85 ° C to 87 ° C. It was.
  • the air volume of the carrier gas for exhausting the necessary amount of moisture can be reduced.
  • condensation can be prevented by providing a heating means for heating the carrier gas on the other end side of the rotating cylinder.
  • the product temperature of the discharged dried product in the present invention refers to the temperature of the dried product immediately after being discharged from the discharge port of the rotating cylinder.
  • the temperature on the discharge side of the carrier gas refers to the temperature of the carrier gas immediately after being discharged from the gas discharge port of the rotating cylinder.
  • the “other end side” of the present invention means less than 50% of the entire length from the other end of the rotating cylinder.
  • the length is in the range of (0.5 to 2.0) D. If the arrangement length of the heating means is short, the heating is not sufficient, and if the arrangement length of the heating means is excessively long, the heating energy loss increases and the equipment cost increases.
  • the amount of carrier gas can be reduced while preventing condensation.
  • FIG. 1 is a perspective view of an example of a horizontal rotary dryer according to the present invention. It is a side view of the example of a horizontal type rotary dryer concerning the present invention. It is the side view which showed the screw feeder and its periphery. It is an enlarged view (side view) of the other end side of a rotating cylinder. It is a side view of the horizontal rotary dryer (modification) concerning the present invention.
  • FIG. 6 is a sectional view taken along line XX in FIG. 5. It is a side view in case a supply system is a chute type. It is a side view in case a supply system is a vibration trough type. It is a side view which shows the example of a structure by the side of discharge of a rotation cylinder.
  • workpiece W As an object to be dried, and specific examples thereof include ores such as coal, copper ore, iron powder, and zinc powder, metallic substances, gypsum, alumina, soda ash, and other inorganic substances. And dehydrated sludge.
  • ores such as coal, copper ore, iron powder, and zinc powder
  • metallic substances such as coal, copper ore, iron powder, and zinc powder
  • metallic substances such as coal, copper ore, iron powder, and zinc powder
  • metallic substances metallic substances, gypsum, alumina, soda ash, and other inorganic substances.
  • dehydrated sludge As dehydrated coal.
  • the present invention is particularly effective in the case of drying coal.
  • the structure of the horizontal rotary dryer has a cylindrical rotating cylinder 10 and is installed so that the axis of the rotating cylinder 10 is slightly inclined with respect to a horizontal plane.
  • One end of the rotary cylinder 10 is positioned higher than the other end.
  • two support units 20 and a motor unit 30 are installed so as to support the rotating cylinder 10, and the rotating cylinder 10 is rotated around its own axis by the motor unit 30. It is supposed to be free.
  • the rotating cylinder 10 is configured to rotate in one direction. The direction can be arbitrarily determined. For example, when viewed from one end side (supply port side of the workpiece W) to the other end side (discharge port side of the workpiece W), counterclockwise (arrow R direction) Can be rotated.
  • a plurality of heating tubes 11 are arranged in the circumferential direction and the radial direction so as to form a concentric circle with respect to the axis of the rotating cylinder 10.
  • the heating tube 11 is warmed by steam or the like as a heating medium flowing through the inside of the heating tube 11.
  • gas blowing means for blowing carrier gas A (inert gas) from the supply port 41 into the rotary cylinder 10 is provided, and is blown by the gas blowing means.
  • carrier gas A in the vicinity of the screw feeder 42.
  • a plurality of discharge ports 50 are formed through the peripheral wall on the other end side of the rotating cylinder 10.
  • a plurality of discharge ports 50 are formed along the circumferential direction of the rotating cylinder 10, and in the example of FIGS. 2 and 4, they are formed so as to be separated from each other so as to form two rows.
  • the several discharge port 50 is all made the same shape, it can also be made into a different shape. Further, as clearly shown in FIG. 1, it is desirable that the processed product E is discharged downward through a hood 35 having a discharge port under the discharge port 50 group.
  • a steam supply pipe 70 and a drain pipe 71 for supplying steam into the heating pipe 11 are provided on the other end side of the rotary cylinder 10.
  • the rotary cylinder 10 is provided with a classification hood 55 that can discharge the workpiece W and the carrier gas A so as to cover the other end side having the plurality of discharge ports 50.
  • the classification hood 55 is formed of, for example, a thick metal, and a fixed discharge port 57 for discharging the dried and classified processed material W, that is, the processed material E, is provided on the bottom surface, and a carrier on the top surface. Each has a fixed exhaust port 56 for exhausting the gas A.
  • the workpiece W is supplied into the screw feeder 42 from the supply port 41, and is supplied into the rotary cylinder 10 by rotating a screw installed in the screw feeder 42 by a driving means (not shown).
  • the workpiece W supplied from the supply port 41 moves to the other end side of the rotary cylinder 10 while being in contact with the heating tubes 11, 11... Heated by the steam, and is moved to the hood via the discharge port 50. 35 is discharged as a processed product E.
  • the carrier gas A blown from the supply port 34 (example in FIG. 1) or the supply port 41 (example in FIG. 2) by the blowing means provided on one end side of the rotary tube 10 passes through the rotary tube 10. It passes through and is exhausted out of the rotary cylinder 10 from the discharge port 50 which is also the discharge port of the workpiece W.
  • the steam supplied from the steam supply pipe 70 into the heating pipe 11 is cooled in the process of flowing through the heating pipe 11 and becomes drain D by the workpiece W and the heating pipe 11 contacting and exchanging heat. , And is discharged from the drain pipe 71.
  • the carrier gas A blown from the supply port 41 by the blowing means provided on one end side of the rotating cylinder 10 passes through the rotating cylinder 10 and is a discharge port 50 that is also a discharge port for the workpiece W.
  • the carrier gas A is exhausted from the discharge port 50 together with the fine particles C dispersed in the rotary cylinder 10 by the scraping plate 60.
  • the carrier gas A exhausted from the exhaust port 50 is exhausted from the classification hood 55 through the fixed exhaust port 56.
  • particles having a large particle size and a heavy weight fall in the rotary cylinder 10 and naturally fall from the discharge port 50 located on the lower side without accompanying the carrier gas A.
  • the particles that have fallen naturally are discharged to the outside as a processed object E from the fixed discharge port 57.
  • a chute method (FIG. 7), a vibration trough method (FIG. 8), and the like can be used as a method for supplying a workpiece to the horizontal rotary dryer.
  • the supply chute 46 is coupled to the intake box 45, and the workpiece W supplied from the supply port 41 falls in the supply chute 46 and moves into the rotary cylinder 10.
  • An intake box 45 is connected to the rotary cylinder 10 via a seal packing 47, and the rotary cylinder 10 rotates while maintaining a seal between the rotary cylinder 10 and the intake box 45.
  • the intake box 45 is a trough (the cross-sectional shape is concave), and a vibration motor 48 and a spring 49 are coupled to the lower end of the intake box 45.
  • the workpiece W supplied from the supply port 41 falls on the trough.
  • the workpiece W is moved into the rotary cylinder 10 by the vibration of the intake box 45 by the vibration motor 48.
  • the intake box 45 it is preferable to have an inclination downward toward the rotating cylinder so that the workpiece W can easily move.
  • the cross-sectional shape of the rotary cylinder 10 may be a rectangle (such as a hexagon) if necessary, in addition to a circle described later.
  • the rectangular rotating cylinder 10 is rotated, the workpiece W is lifted by the corner portion of the rotating cylinder 10, so that there is an advantage that the mixing property of the workpiece W is improved.
  • there is a demerit that the number of heating tubes to be arranged is reduced because the cross-sectional area of the rotating cylinder 10 is narrower than in the case of a circular shape.
  • FIG. 9 a form as shown in FIG. 9 can also be adopted.
  • the carrier gas A passes through the casing 80 from the inside of the rotating cylinder 10 through the inside of the partition wall 23 and is discharged from the carrier gas discharge port 33 on the upper part thereof.
  • the carrier gas A is a reuse gas
  • dust or the like is contained in the carrier gas A.
  • the ribbon screw Z is disposed inside the partition wall 23, that is, the gas passage U2
  • the gas Dust or the like mixed in is captured by the ribbon screw Z.
  • the captured dust or the like is sent toward the openings 21 and 22 by the feeding action of the ribbon screw Z, and is discharged into the casing 80.
  • the discharged dust or the like is discharged from the discharge port 32 below the discharge casing by free fall.
  • the screw blades 24 also rotate. Therefore, the dried processed product E from which the workpiece W has been dried is sent through the feed passage U1 toward the openings 21 and 22 by the feeding action of the screw blades 24 and is discharged from the openings 21 and 22.
  • the discharged dry matter E is discharged from the discharge port 32 below the discharge casing by its own weight.
  • a steam path (an internal steam supply pipe 61 and an internal drain discharge pipe 62) that penetrates the casing 80 and extends into the partition wall 23 is provided integrally with the rotary cylinder 10.
  • the internal steam supply pipe 61 communicates with the inlet header part of the heating pipe 11 in the end plate part 17, and the internal drain discharge pipe 62 communicates with the outlet header part of the heating pipe 11 in the end plate part 17.
  • the steam supply pipe 70 and the drain discharge pipe 71 are connected to the internal steam supply pipe 61 and the internal drain discharge pipe 62 via the rotary joint 63, respectively.
  • the support structure of the rotary cylinder 10 includes a screw casing 42 provided on one end side and a gas pipe 72 provided on the other end side in addition to the support structure in which the two tire members 20, 20 are attached to the outer periphery of the rotary cylinder 10.
  • a bearing (not shown) may be attached to the outer periphery of the tire to support the bearing, or a support structure in which the tire member 20 and the bearing are combined.
  • the arrangement of the heating tubes 11 can be selected as appropriate together with the number of the heating tubes 11. For example, in addition to the arrangement along the radial radial line as shown in FIG. 10, a curved line as shown in FIG.
  • condition (1) is satisfied in the form described above.
  • condition (2) the condition that the product temperature is 95 ° C. or higher
  • (3) the condition that the temperature on the discharge side of the carrier gas is 95 ° C. or higher the temperature of the heating medium to be circulated in the heating pipe is determined Select the speed and arrangement of the heating tube.
  • the important factors for satisfying the conditions (2) and (3) are the temperature of the carrier gas and the air volume of the carrier gas passing through the rotating cylinder.
  • heating means for the carrier gas is provided.
  • a jacket 12 surrounding the rotating cylinder 10 is provided on the other end side of the rotating cylinder 10, and the heating medium S is caused to flow between the outer wall surface of the rotating cylinder 10 and the inner wall of the jacket 12. It is desirable to heat from the outside.
  • the drying speed of the workpiece W can be increased, and the temperature of the carrier gas A on the other end side (discharge side) is increased, which is suitable for preventing condensation.
  • the heating medium S include steam at 95 ° C. or higher (preferably 99 ° C. or higher) to 200 ° C., off-gas at factories (particularly steelworks), and the like.
  • a form in which a plurality of trace pipes 12A are provided so as to surround the rotating cylinder 10 is also suitable.
  • the product temperature of the discharged dry matter can be defined as a temperature passing through the discharge port, but normally, the outlet temperature of the hood 35 may be used as an index.
  • the “temperature on the discharge side of the carrier gas” is realistic in that the outlet temperature at the discharge port is used as an index.
  • fins 12B are provided on the discharge side of the heating tube 11 to increase the contact rate between the carrier gas and the object to be processed, and to increase the product temperature of the discharged dry matter and the temperature on the discharge side of the carrier gas. It becomes an effective heating means.
  • a retainer 13 in order to adjust the hold-up on the discharge side and reduce the filling rate, a retainer 13 can be provided as shown in FIG. What is necessary is just to select the height of the retainer 13 suitably. By providing the retainer 13, there is less stagnation on the downstream side, and the discharge is performed. Therefore, the filling rate of “discharged dry matter” is reduced, and the product temperature of the discharged dry matter and the temperature on the discharge side of the carrier gas are reduced. Can be increased.
  • FIG. 12 is a graph of drying change in the case of a certain coal type
  • the gas dew point differs depending on whether the amount of carrier gas is large or small.
  • condensation occurs in the “condensation region” shown in the figure. Therefore, as shown in the figure, it can be understood that dew condensation is prevented when the carrier gas temperature and the product temperature are increased.
  • the carrier gas amount is about 20% of the comparative example under the conditions of the present invention.
  • the dried product is hot-molded in consideration of the risk of dust explosion and ignition. In this case, it is necessary to raise the product temperature to about 100 ° C. to 150 ° C.
  • the product temperature of the dried product is increased, there is an advantage that it is suitable for hot forming. It was found.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
PCT/JP2015/076768 2015-04-10 2015-09-18 横型回転式乾燥機による乾燥方法及び乾燥システム WO2016163044A1 (ja)

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JP2015080687A JP5946076B1 (ja) 2015-04-10 2015-04-10 横型回転式乾燥機による乾燥方法及び乾燥システム
JP2015-080687 2015-04-10

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Publication number Priority date Publication date Assignee Title
JP6856832B2 (ja) * 2016-12-02 2021-04-14 株式会社大川原製作所 乾燥機
JP6732288B2 (ja) * 2017-05-10 2020-07-29 株式会社西村鐵工所 乾燥装置及び乾燥方法
KR102347901B1 (ko) 2017-10-17 2022-01-06 주식회사 엘지에너지솔루션 균열 방지 구조를 포함하는 파우치형 전지케이스 및 이의 제조방법

Citations (11)

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Publication number Priority date Publication date Assignee Title
JPS5765570A (en) * 1980-10-06 1982-04-21 Kubota Ltd Rotary type dryer
JPS58129183A (ja) * 1982-01-29 1983-08-02 木村　和則 間接加熱管付回転乾燥機の滞留量調節装置
JPS6127483A (ja) * 1984-07-16 1986-02-06 月島機械株式会社 加熱媒体が通る伝熱板を使用した回転乾燥機
JPH05209180A (ja) * 1991-12-11 1993-08-20 Kawasaki Heavy Ind Ltd 乾燥機
JPH0659792U (ja) * 1993-01-18 1994-08-19 川崎重工業株式会社 コール・イン・チューブ・ドライヤ
JP2001335632A (ja) * 2000-05-26 2001-12-04 Mitsubishi Gas Chem Co Inc ポリフェニレンエーテルの製造方法
JP2004044876A (ja) * 2002-07-10 2004-02-12 Tsukishima Kikai Co Ltd 乾燥装置および乾燥方法
JP2004197989A (ja) * 2002-12-17 2004-07-15 Tamagawa Machinery Co Ltd 濃縮装置
JP2009097783A (ja) * 2007-10-16 2009-05-07 Kobe Steel Ltd 間接加熱乾燥装置、被乾燥物の間接加熱乾燥方法、ならびに固形燃料の製造方法および製造装置
JP2012117746A (ja) * 2010-11-30 2012-06-21 Tsukishima Kikai Co Ltd 間接加熱型回転乾燥機
JP2012167851A (ja) * 2011-02-14 2012-09-06 Tsukishima Kikai Co Ltd 石炭の横型回転式乾燥機、石炭ボイラ設備及び石炭ボイラ設備の運転方法

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Publication number Priority date Publication date Assignee Title
US5069801A (en) * 1990-02-26 1991-12-03 Bio Gro Systems, Incorporated Indirect heat drying and simultaneous pelletization of sludge

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5765570A (en) * 1980-10-06 1982-04-21 Kubota Ltd Rotary type dryer
JPS58129183A (ja) * 1982-01-29 1983-08-02 木村　和則 間接加熱管付回転乾燥機の滞留量調節装置
JPS6127483A (ja) * 1984-07-16 1986-02-06 月島機械株式会社 加熱媒体が通る伝熱板を使用した回転乾燥機
JPH05209180A (ja) * 1991-12-11 1993-08-20 Kawasaki Heavy Ind Ltd 乾燥機
JPH0659792U (ja) * 1993-01-18 1994-08-19 川崎重工業株式会社 コール・イン・チューブ・ドライヤ
JP2001335632A (ja) * 2000-05-26 2001-12-04 Mitsubishi Gas Chem Co Inc ポリフェニレンエーテルの製造方法
JP2004044876A (ja) * 2002-07-10 2004-02-12 Tsukishima Kikai Co Ltd 乾燥装置および乾燥方法
JP2004197989A (ja) * 2002-12-17 2004-07-15 Tamagawa Machinery Co Ltd 濃縮装置
JP2009097783A (ja) * 2007-10-16 2009-05-07 Kobe Steel Ltd 間接加熱乾燥装置、被乾燥物の間接加熱乾燥方法、ならびに固形燃料の製造方法および製造装置
JP2012117746A (ja) * 2010-11-30 2012-06-21 Tsukishima Kikai Co Ltd 間接加熱型回転乾燥機
JP2012167851A (ja) * 2011-02-14 2012-09-06 Tsukishima Kikai Co Ltd 石炭の横型回転式乾燥機、石炭ボイラ設備及び石炭ボイラ設備の運転方法

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KR102384141B1 (ko) 2022-04-07
JP2016200329A (ja) 2016-12-01
TW201636556A (zh) 2016-10-16
TWI660148B (zh) 2019-05-21
KR20170134306A (ko) 2017-12-06
JP5946076B1 (ja) 2016-07-05

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