KR20120018278A - Drying and classifying apparatus and drying and classifying method for material to be treated - Google Patents

Abstract

PURPOSE: Materials drying/classifying apparatus and method are provided to enhance the precision of classification since if gas rises, fine articles rise by the gas. CONSTITUTION: A materials drying/classifying apparatus comprises a rotating tank(10), a heating unit(11), a classifying hood(55), and a raising unit. A hole(41) to supply targets(W) and carrier gas(A) is formed on one end of the rotating tank. A hole to discharge the target and the carrier gas is formed on the other end of the rotating tank. In the processes of supplying the targets through the supplying hole and discharging them through the discharging hole, the heating unit heats and dries the targets by heating the rotating tank. The classifying hood comprises a fixed discharging hole(57) to discharge the targets.

Description

DRYING AND CLASSIFYING APPARATUS AND DRYING AND CLASSIFYING METHOD FOR MATERIAL TO BE TREATED}

The present invention relates to a dry classifier and a dry classification method for performing dry classification of a workpiece. In particular, the effect of the present invention is remarkable when the object to be treated is coal.

In the manufacture of coke, production using coal with low coking property is frequently performed because of lack of high quality coking coal (strong coking coal and weak coking coal) and a price increase. Coal with low cohesiveness is used after drying. When moisture is 6.5% or less, coal particles of about 100 μm or less are oscillated, causing problems such as deterioration of the working environment. In addition, when coal fine particles of about 300 μm or less are supplied to the coke oven, a problem arises that carbon is attached to the coke oven. Therefore, in order to solve such a problem, classification and removal of microparticles | fine-particles from coal are performed by the classification apparatus before drying or after drying.

On the other hand, conventionally, a horizontal rotary dryer or a fluidized bed dryer is used for drying coal, but it is considered that a horizontal rotary dryer is advantageous in terms of equipment cost because it consumes less power than a fluidized bed dryer.

As a representative example of the conventional horizontal rotary dryer, what is called a steam tube dryer (STD) is known. In drying using a steam tube dryer, spraying a carrier gas is generally performed for the purpose of improvement of drying efficiency, etc. (for example, refer patent document 1). As shown in FIG. 7, the steam tube dryer is provided with the rotating cylinder 110 which can be rotated about an axial center, and rotated the rotating cylinder 110, and was supplied (loaded) from the one end side of the said rotating cylinder 110. The dry matter is conveyed to the other end and discharged. In this conveyance process, a to-be-dried material is dried by the heating steam as external heat for drying.

More specifically, the rotating tube 110 has a length of, for example, 10 to 30 m, and a heating tube that is heated by supplying steam heated as a heat medium therebetween between the plates at both ends of the rotating tube 110. A plurality of 111 extends along the axial direction. When the dry matter such as wet powder or granular powder is supplied to the inside of the rotary tube 110, it is heated and dried by contacting the heating tube 111, and sequentially with the rotation of the rotary tube 110 toward the outlet 112. Is moved.

In addition, an injection port 113 of a carrier gas is provided at one end of the rotary cylinder 110, and is provided with a gas exhaust port provided in communication with the discharge port 112 at the other end with the evaporation gas generated inside the rotary cylinder 110. 122, the carrier gas is discharged.

However, since such a conventional horizontal rotary dryer does not have a classification function, when classifying and removing fine particles after drying the coal, it is necessary to install a classification device in addition to the dryer, thereby increasing the equipment cost. do. In addition, since these devices are designed in consideration of only drying or classification, respectively, when drying and classification are performed using these devices, only drying and classification are performed in order, and handling property is reduced.

Patent Document 1: Japanese Patent Laid-Open No. 2004-44876

The main problem to be solved by the present invention is to provide a dry classifier and a dry classification method capable of efficiently drying and classifying a workpiece.

This invention which solved this subject is as follows.

[Invention of Claim 1]

A rotary tube rotatable around an axis having an supply port for the object and the carrier gas on one end and an outlet port for the object and the carrier gas on the other end;

Heating means for heating and drying the object to be processed by heating the inside of the rotating cylinder in the process of supplying the object through the supply port and discharging it through the discharge port;

A classification hood having a fixed discharge port for discharging the object to be processed in the lower part and a fixed exhaust port for exhausting the carrier gas in the upper part and covering the other end side of the rotary cylinder;

And a blow-up means for dispersing gas provided in a path from which the object to be treated in the classification hood reaches the fixed outlet.

(Main effect)

When the carrier gas is discharged together with the workpiece through the discharge port of the workpiece, the relatively large particles in the workpiece accompanied with the carrier gas reach the limit due to gravity as early ascending energy. At that point, the descent begins and is discharged to the outside through the fixed outlet of the bottom of the classification hood together with the workpiece which is not accompanied by the carrier gas. On the other hand, relatively small-diameter particles in the workpiece to be accompanied by the carrier gas are discharged to the outside through the fixed exhaust port above the classification hood while being accompanied by the carrier gas. Therefore, relatively small particles (particulates) are classified and removed from the object to be treated.

Further, when blowing up the dispersion gas, the fine particles dropped down together with the workpiece which is not accompanied by the carrier gas, or the fine particles dropped down due to insufficient rising energy are blown up by the dispersion gas, thereby improving the accuracy of classification. do. In addition, if the blowing of the dispersion gas is carried out in the path of the workpiece to reach the fixed outlet in the classification hood, the blowing effect is surely exerted on the fine particles, and the workpiece that is not blown up is fixed to the bottom of the classification hood as it is. Since it is discharged to the outside through the outlet, it is not necessary to consider to guide the non-blowing target to the fixed outlet.

[Invention of Claim 2]

According to claim 1, wherein the blowing means of the dispersion gas is made of a pipe member for blowing up the dispersion gas through a hole formed in the peripheral wall,

And the pipe member is provided to cross the path of the workpiece to the fixed outlet.

(Main effect)

If the blowing means for dispersing gas is a pipe member that crosses the path of the workpiece to reach the fixed discharge port, for example, by attaching the pipe member at appropriate intervals, the discharge of the workpiece that does not blow up is not inhibited. Moreover, when a dispersion gas is blown up through the hole formed in the circumferential wall of a pipe member, a blow up effect is reliably obtained.

[Invention of Claim 3]

The to-be-processed object classification machine according to claim 1, wherein the classifying hood is provided with a settling region of the dispersed object to be positioned above the height of the rotating cylinder.

(Main effect)

When a classification hood is provided so that a settling area | region may be formed above a rotating cylinder, classification and removal of the said microparticles | fine-particles are performed reliably in the said settling area | region, and classification accuracy improves.

[Invention of Claim 4]

The dry classification method of the to-be-processed object characterized by using coal as a to-be-processed object in the dry classifier of Claim 1.

(Main effect)

When carrier gas is discharged | emitted with coal from the other end side of a rotating cylinder, in the classification space after this discharge, since the comparatively large diameter particle | grains in the coal accompanying a carrier gas reach an upper limit by rising force by gravity, At that point, the descent begins and is led downward in the classification space with coal not entrained in the carrier gas. On the other hand, relatively small particles in coal accompanying the carrier gas are led upward in the classification space while being accompanied by the carrier gas. Therefore, it is possible to classify and remove relatively small particles (particulates) from the coal after drying.

[Invention of Claim 5]

The flow rate of the said dispersion gas in the dry classifier of Claim 1 is less than the flow volume of the carrier gas which blows in from the one end of the said rotating cylinder, The dry classification method of the to-be-processed object characterized by the above-mentioned.

(Main effect)

If the flow rate of the dispersion gas is set to a flow rate less than the flow rate of the carrier gas blown from one end of the rotary cylinder, the flow of the carrier gas in the rotary cylinder is not affected, and as a result, the drying of the object to be processed is not affected. Not crazy

According to the present invention, it is possible to efficiently dry and classify a workpiece.

1 is a front view of a horizontal rotary dryer of one embodiment of the present invention.
It is an enlarged view of the other end side of a rotating cylinder, and is a figure which removed classification hood.
3 is a cross-sectional view taken along the line X-X of FIG.
4 is an enlarged view of the classification hood.
5 is an enlarged view of the blowing means for dispersing gas.
6 (a) and 6 (b) are explanatory diagrams of blowing means for dispersing gas.
7 is a perspective view of a conventional steam tube dryer.
8 is a flowchart of a dry classification process of the first aspect.
9 is a flowchart of the dry classification process of the second embodiment.

Next, embodiment of this invention is described.

The horizontal rotary dryer used for the dry classification of this form was shown in FIG. The horizontal rotary dryer has a cylindrical rotary cylinder 10, and is installed so that the shaft center of the rotary cylinder 10 is slightly inclined with respect to the horizontal plane, and one end of the rotary cylinder 10 is positioned higher than the other end. In the lower part of the rotating cylinder 10, the two support units 20 and the motor unit 30 are installed so that the rotating cylinder 10 may be supported, and the rotating cylinder 10 is mounted by the motor unit 30 by itself. It is possible to rotate around the shaft center. As shown in Fig. 3, the rotary cylinder 10 is rotated in one direction in a counterclockwise direction (arrow R direction) in the illustrated example, and the rotational speed is, for example, less than 1 m / s in the circumferential speed.

Inside the rotary cylinder 10, a large number of steam tubes 11 are formed to extend along the axial direction of the rotary cylinder 10 such that a metal pipe can flow steam or the like inside thereof. have. The steam tube 11 is arranged in plurality in the circumferential direction and the radial direction so as to form a concentric circle with respect to the axis of the rotary cylinder 10, for example.

As shown in FIG. 2, the some discharge port 50 penetrates the circumferential wall in the other end side of the rotating cylinder 10. As shown in FIG. The plurality of outlets 50 are formed in two rows along the circumferential direction of the rotary cylinder 10 and are spaced apart from each other. In addition, although the some discharge port 50 has the same shape all, it can also be set as another shape.

As shown in FIG. 3, the inside of the rotating cylinder 10 is provided with the some scraping-up plate 61 extended from the inner wall of the rotating cylinder 10 toward the axial center of the rotating cylinder 10. As shown in FIG. As shown in FIG. 1, the plurality of scraping-up plates 61 are spaced apart in the axial direction, and are arranged to form a plurality of rows and three rows in the illustrated example. As shown in FIG. 3, each scraping-up plate row 60 is comprised from the several scraping-up plate 61 in the example of several sheets spaced apart at equal intervals from each other.

Each scraping plate 61 is formed of a thick metal, and the tip portion has a hook shape bent toward the front of the rotation direction (R) of the rotary cylinder (10). The extension length of the scraping-up plate 61 becomes 1/10-3/10 of the inner diameter D of the rotating cylinder 10, for example.

In addition, each scraping plate 61 passes through the front end of the discharge port 50 located in the rear side of the rotation direction R of the rotary cylinder 10, and is also parallel to the axial direction of the rotary cylinder 10. It is arrange | positioned so that it may extend from the vicinity of the straight line which comprises this. Therefore, the outlet port 50 does not exist in the nearest front side of the scraping plate 61, and the inner wall of the rotating cylinder 10 exists.

As shown in FIG. 1, the scraping-up plate row 60 is arrange | positioned between the discharge port 50 and the supply port 41 mentioned later in the inside of the rotating cylinder 10, and is compared with the rotating cylinder ( 10) It does not exist in the other end side in an inside. In addition, the scraping-up plate row 60 is arrange | positioned in the discharge port 50 side part between the discharge port 50 and the supply port 41. As shown in FIG.

As shown in FIG. 1, the to-be-processed object W supplied (loaded) to the inside of the rotating cylinder 10 rather than the scraping plate row 60 in the inside of the rotating cylinder 10 inside. Stirring means 65 for stirring) is provided. This stirring means 65 is also spaced apart from the scraping plate row 60 disposed at the one end side in the inside of the rotary cylinder 10. As this stirring means 65, a well-known stud type, a reverse blade, etc. can be used, for example. Especially, it is preferable to select an inverse blade for the reason of the effect of microparticle separation (dispersion) and the structure limitation of STD.

As shown to FIG. 1 and FIG. 4, the rotating cylinder 10 has the classification hood 55 which can discharge | process the to-be-processed object W and carrier gas A so that the other end side which has some discharge port 50 may be covered. Is provided. The classification hood 55 is formed of a thick metal, and as shown in FIG. 3, the treated object W, that is, the treated object E, dried and classified on the bottom surface of the lower portion 55d is fixed. The discharge port 57 has the fixed exhaust port 56 of the carrier gas A on the ceiling surface of the upper part 55u, respectively. Moreover, the classification hood 55 becomes narrower as the upper part 55u faces the fixed exhaust port 56 with respect to the width direction orthogonal to the axial direction, and similarly, the lower part 55d also has a fixed discharge port with respect to the width direction. The width becomes narrower toward (57). The fixed exhaust port 56 and the fixed exhaust port 57 are located at approximately the center of the classification hood 55 in plan view.

The inside of the classification hood 55 is a classification space filled with air, and the inside of the classification hood 55 above the rotating cylinder 10 (indicated by the reference L) is a settling area 90. That is, the classification hood 55 is provided so that the settling area | region 90 may be formed above the rotating cylinder 10. As shown in FIG. In addition, the classification hood 55 is fixed to the ground by means not shown, and does not rotate with the rotation of the rotary cylinder 10.

The fixed exhaust port 56 is opened in the vertical direction, and is connected to the dust collecting means 201 as shown in FIGS. 8 and 9. Through the fixed exhaust port 56, the carrier gas A is exhausted with the evaporation gas and the fine particles C are discharged. In addition, the fixed discharge port 57 is also opened in the vertical direction and is connected to a conveying means 204 such as a belt conveyor. Through the fixed discharge port 57, the fine particles C are classified and removed, and the processed material E is discharged.

The distance L between the upper edge of the rotary cylinder 10 and the fixed exhaust port 56 is preferably L> 0.3D with respect to the inner diameter D of the rotary cylinder 10, and 0.8D <L < It is more preferable that it is 4.0D, and it is especially preferable that it is 1.0D <L <2.5D. When the separation distance L is 0.3 D or less, the classification function is not sufficiently exhibited, and relatively large-diameter particles F are also discharged through the fixed exhaust port 56 together with the carrier gas A to reduce the classification accuracy or dust collection. There is a risk of causing an increase in the load of the means 201. On the other hand, if the separation distance (L) is 4.0D or more, it is not economical to provide a space more than the separation distance required for classification.

Moreover, in the settling area | region 90, as shown in FIG. 4, the classification hood 55 spreads in the axial direction. If the classification hood 55 is spread in the axial direction in the settling area 90, the particles F and the like are different from each other, or the classification hood 55 (in particular, the wall members at both ends of the classification hood 55 in the axial direction). Since the probability of colliding with (55A, 55B) is reduced, classification accuracy is improved. On the other hand, spreading in the axial direction means spreading compared to the connecting portion with the rotary cylinder (10).

The settling area | region 90 does not need to spread axially over the full length with respect to an up-down direction. In the vicinity of the rotary cylinder 10, since the fine particles (C) and the like are immediately discharged from the rotary cylinder 10 through the discharge port 50, and do not spread in the plane, it is possible to prevent them from spreading in the axial direction as in the illustrated example. It may be. Moreover, in the upper part 55u of the classification hood 55, as shown in the illustration, it is preferable that the width | variety becomes narrow toward the fixed exhaust port 56 with respect to an axial direction.

The spreading degree of the classification hood 55 is preferably set to 1.5 Z1 <Z 2 <6 Z1 when the axial length of the connecting portion with the rotary cylinder 10 is Z1 and the axial length of the spreading portion is Z2. It is more preferable to set 2Z1 <Z2 <4Z1.

In the settling area 90, as shown in FIGS. 3 and 4, a plurality of support members are provided between the wall member 55A on one side in the axial direction of the classification hood 55 and the wall member 55B on the other side in the axial direction. 62 and 63 are provided. If the classification hood 55 is spread in the axial direction, the strength may decrease, but a plurality of support members 62 and 63 are disposed between the wall member 55A on one side in the axial direction and the wall member 55B on the other side in the axial direction. The strength of the classification hood 55 is maintained by being provided. On the other hand, the support members 62 and 63 are also provided between the one wall member 55A and the other wall member 55B of the part which is not spread in the axial direction of the classification hood 55 like the example of illustration. Can be.

The support member for maintaining the strength of the classification hood 55 may be composed of only a straight rod, a pipe member, or the like, but in this embodiment, the pipe member 62 and the umbrella member disposed on the pipe member 62 ( 63). The umbrella member 63 has an umbrella shape in which the center in the width direction protrudes upward, and is disposed to extend along the extending direction of the pipe member 62. The presence of the umbrella member 63 prevents the processing of the W to be deposited on the pipe member 62. The umbrella member 63 itself may or may not have a function for maintaining the strength of the classification hood 55.

As described above, the upper portion 55u of the classification hood 55 becomes narrower toward the fixed exhaust port 56 in the width direction, but in this case, the lower portion of the classification hood 55 is shown in FIG. 3 below. As shown, it is preferable that the support members 62 and 63 are not positioned. When the upper portion 55u of the classification hood 55 is narrowed toward the fixed exhaust port 56 in the width direction, as shown in FIG. 3, the flow flowing along the wall member in which the width is narrowed (S1). ) Is generated and microparticles (C) are piggybacked in this flow (S1). Therefore, ascending fine particles C do not collide with the ceiling surface of the classification hood 55 and fall, and the classification accuracy is improved. Moreover, in the inside of the classification hood 55, the flow S1 which flows along the said wall member generate | occur | produces, and the flow S2 which rises vertically mainly arises, and this flow S2 also has a fine particle ( C) piggybacks. Therefore, when the plurality of support members 62 and 63 are not located below the fixed exhaust port 56, the fine particles C that have piggybacked on the flow S2 rising vertically in the center collide with the support members 62 and 63. It does not fall, and classification accuracy improves more.

As shown in FIG. 3, inside the classification hood 55, in the path | route of the to-be-processed object W which reaches the fixed discharge port 57 by free fall etc. via the discharge port 50 of the rotating cylinder 10, ie, A blowing means 58 for dispersing gas N is provided below the rotary cylinder 10. When the dispersion gas N is blown up inside the classification hood 55 in this manner, the fine particles C dropped down together with the workpiece W not accompanied by the carrier gas A, Since the fine particles C which have fallen because the rising energy is insufficient are blown up by the dispersion gas N, the accuracy of classification is improved. In addition, when blowing of the dispersion gas N is performed in the path | route of the to-be-processed object W which reaches the fixed discharge port 57, in the state contained in the to-be-processed object W which does not accompany the carrier gas A, By being discharged from the inside of the rotating cylinder 10, the blowing effect is surely exerted on the free-falling fine particles C, and the to-be-processed object W which is not blown up is fixed as the fixed discharge port of the bottom surface of the classification hood 55 ( Since it is discharged to the outside as the treatment (E) through 57, it is not necessary to consider to guide the workpiece (W) that does not blow up to the fixed discharge port (57).

As described above, in this embodiment, the fine particles C in the workpiece W are combined with the carrier gas A by using not only the sedimentation region 90 but also the entire classification space (inside the classification hood 55). It is guided upwards and the workpiece W except fine particles C is guided downwards.

The specific form of the blowing means 58 of the dispersion gas N is not particularly limited, and for example, a dispersion plate made of a screen member or the like and a means for blowing the dispersion gas N through the mesh of the screen member may be configured. It may be. On the other hand, when the blowing means 58 is not provided in the path of the workpiece W leading to the fixed discharge port 57, it is considered to incline the dispersion plate toward the fixed discharge port 57 as the above consideration. Since the processing object W, which does not blow up even when the distribution plate is inclined, is deposited on the distribution plate, it is necessary to separately consider to guide the processing object W to the fixed outlet 57.

On the other hand, in this embodiment, as the blowing means 58 of the dispersion gas N, as shown in FIG. 5 and FIG. 6, it traverses the path | route of the to-be-processed object W which reaches the fixed discharge port 57, Moreover, the pipe member 58A in which the hole 58Ac was formed in the peripheral wall is provided, and is comprised so that a dispersion gas N may be blown up through the hole 58Ac formed in this pipe member 58A. Thus, when the blowing means 58 of the dispersion gas N is comprised in the pipe member 58A which crosses the path | route of the to-be-processed object W which reaches the fixed discharge port 57, the to-be-processed object ( No consideration is needed to guide W) to the fixed outlet 57. In addition, when the dispersion gas N is blown up through the hole 58Ac formed in the circumferential wall of the pipe member 58A, the blowing effect is surely extended to the fine particles C.

In this embodiment, the holes 58Ac formed in the circumferential wall of the pipe member 58A are circular, and a plurality of holes 58Ac are formed at appropriate intervals in the extending direction of the pipe member 58A. In addition, as shown in FIG. 6A, the hole 58Ac is formed so that the dispersion gas N blows upward at an angle.

It is preferable that the pipe member 58A be arranged in parallel in the axial direction in the vicinity of the fixed discharge port 57 as shown in the example. In this aspect, the dispersion gas N is injected into the workpiece W to be lowered through the pipe members 58A adjacent to each other, so that the fine particles C are blown up by the dispersion gas N. On the other hand, the workpiece W which does not blow up is lowered as it is through the pipe members 58A, and discharged to the outside through the fixed discharge port 57 as the treatment E. On the other hand, the fine particles (C) blown up by the dispersion gas (N) is raised upward through the interior of the classification hood 55, and then further upwards by the carrier gas (A) to the outside through the fixed exhaust port (56). Discharged.

The pipe member group which consists of several pipe member 58A can also be provided in multiple stages spaced apart in the up-down direction. In addition, the amount of dispersion gas N blown up through each hole 58Ac may be changed in accordance with the amount of the workpiece W to fall. In addition, as in this embodiment, the umbrella member 58B may be disposed on each pipe member 58A. The umbrella member 58B has an umbrella shape in which the center in the width direction protrudes upward, and extends along the extending direction of the pipe member 58A. The presence of the umbrella member 58B prevents the deposition of the workpiece W on the pipe member 58A more reliably.

As the dispersion gas N, for example, in addition to air, an inert gas such as nitrogen gas or argon gas may be used, and the dispersion gas N may be selected in accordance with the characteristics of the target object W. However, it is preferable to use an inert gas in the case where the to-be-processed object W has a ignition property, such as coal, or a thing which produces a dust explosion.

In this embodiment, as shown in FIG. 8, inert gas N2, such as nitrogen, is mixed with air N1, and this mixed gas is heat-exchanged by heat exchanger 205 using heat medium S, such as steam. It is heated to make a dispersion gas (N).

The mixing ratio of the inert gas (N2) to the air (N1) is not particularly limited, but is fixed in the case where the workpiece W has ignition properties such as coal, or is likely to cause dust explosion. It is preferable to mix so that the oxygen concentration of the gas exhausted through the exhaust port 56 is 13% or less, preferably 12% or less. The suppression of the oxygen concentration in this way is to avoid the explosion of fine particles (C) such as coal. On the other hand, since the carrier gas A contains water vapor evaporated along with the drying of the processing target object W, the oxygen concentration is lowered, so that the fine particles C are unlikely to explode. That is, this explosion is a problem that becomes remarkable by blowing in the dispersion gas (N).

Above all, increasing the mixing ratio of the inert gas (N2) increases the cost. The dispersion gas (N) is exhausted through the fixed exhaust port (56) together with the carrier gas (A), and then conveying means (202) such as a belt conveyor. Particulates C are removed from the connected dust collecting means 201 and exhausted through the chimney 203.

Therefore, as shown in FIG. 9, it is preferable that the gas exhausted through the fixed exhaust port 56 is reused as the dispersion gas N after removing the fine particles C from the dust collecting means 201. Since the carrier gas A (including the dispersing gas N) discharged from the inside (classification space) of the classification hood 55 is low oxygen and warmed, the carrier gas A after removing the fine particles C ) Can be suitably used as a dispersion gas (N). Of course, the carrier gas A may be properly heated using the heat exchanger 205.

Although the carrier gas A exhausted through the fixed exhaust port 56 may use all of it as the dispersion gas N, only part of it may be used as shown in the example, and the rest may be exhausted to the atmosphere through the chimney 203. have. Above all, the flow rate of the dispersion gas N is preferably smaller than the flow rate of the carrier gas A blown from one end of the rotary cylinder 10, and is 1/5 to 1 / of the flow rate of the carrier gas A. It is more preferable to set it to 2. In this way, when the flow rate of the dispersion gas N is set to a flow rate smaller than the flow rate of the carrier gas A blown from one end of the rotary cylinder 10, the flow of the carrier gas A in the rotary cylinder 10 is reduced. There is no influence, and as a result, there is no influence on the drying of the to-be-processed object W.

Here, in the case where the object W is ignitable, such as coal, or is likely to cause dust explosion, the oxygen concentration of the gas exhausted through the fixed exhaust port 56 is 13% or less (preferably Is 12% or less). Thus, although not shown, the oxygen concentration of the gas exhausted through the fixed exhaust port 56 is measured (monitored) by an oxygen concentration meter, and when the measured value exceeds a prescribed value, the measured value is less than or equal to a predetermined value. What is necessary is just to mix an inert gas with dispersion gas N.

On the other hand, as shown in FIG. 1, the supply pipe 70 and the drain pipe 71 which supply steam in the steam tube 11 are provided in the other end side of the rotating cylinder 10. As shown in FIG. In addition, at one end of the rotary cylinder 10, a screw feeder 42 having a cylindrical shape and having a cylindrical shape is fitted to be fitted into the rotary cylinder 10. One end of this screw feeder 42 is provided with drive means 43 such as a motor for rotating the screw provided in the screw feeder 42. Moreover, the supply port 41 is opened in the upper part of the screw feeder 42, and this supply port 41 and the inside of the screw feeder 42 are in communication.

The workpiece W to be dried by the horizontal rotary dryer according to this embodiment is supplied into the screw feeder 42 through the supply port 41, and drives the screw installed in the screw feeder 42 to drive means 43. By rotating by), it is supplied to the inside of the rotating cylinder 10. In the vicinity of the screw feeder 42, a gas injection means (not shown) for blowing air, an inert gas, or the like as the carrier gas A into the inside of the rotary cylinder 10 through a supply port 41 which is also a gas injection port is provided. The carrier gas A blown by this gas injection means is distributed inside the rotating cylinder 10 toward the other end side of the rotating cylinder 10.

Next, the operation of the horizontal rotary dryer will be described.

When drying the to-be-processed object W by this horizontal rotary dryer, as shown in FIG. 1, the to-be-processed object W is supplied to the supply port 41. FIG. The to-be-processed object W supplied through the supply port 41 is supplied to the inside of the rotating cylinder 10 by the screw feeder 42, and is dried in contact with the steam tube 11 heated by steam, It moves to the other end side of the tradition (10) (drying process).

When the to-be-processed object W reaches the position where the stirring means 65 exists, it is stirred by the stirring means 65, and, as shown in FIG. 3, accompanying the rotation of the rotating cylinder 10 is carried out. It is scraped up by the rotating scraping plate 61. The object to be scraped up (W) falls naturally when the scraping plate (61) is located above the rotary cylinder (10), and at this time, the fine particles (C) contained in the object (W) are rotated It is distributed within 10 (so-called flight action).

On the other hand, the carrier gas A blown in through the supply port 41 by the injection means provided in the one end side of the rotating cylinder 10 passes through the inside of the rotating cylinder 10, and discharges the to-be-processed object W. FIG. It is exhausted out of the rotating cylinder 10 through the outlet 50 which is also. At this time, the carrier gas A is exhausted through the discharge port 50 with the fine particles C dispersed in the rotary cylinder 10 by the scraping plate 61. The carrier gas A exhausted through the discharge port 50 is exhausted from the inside (classification space) of the classification hood 55 through the fixed exhaust port 56 together with the fine particles C. As shown in FIG. In addition, the dispersing gas N is supplied to the upper part of the classification hood 55 by the injection means 58 of the dispersing gas N to blow up. The flow rate of the dispersion gas N is usually smaller than the flow rate of the carrier gas A. FIG. On the other hand, when the carrier gas A is exhausted through the discharge port 50, the flow velocity is, for example, 5 to 10 m / s. This flow rate is suitably adjusted according to the area of the discharge port 50 and the injection amount of the carrier gas A.

Particles having a large particle diameter and heavy weight in the object W fall in the rotary cylinder 10 and naturally fall through the outlet 50 located below without being accompanied by the carrier gas A. FIG. This naturally-falling particle (process W) does not blow again by the dispersion gas N, but passes between the pipe members 58A to the outside through the fixed discharge port 57 as the process E. Discharged. In addition, although the particles F having a relatively large diameter in the workpiece W are accompanied by the carrier gas A and discharged through the discharge port 50, the particles F are heavy and fixed with the carrier gas A. It falls down without reaching), and is discharged as the processed object E through the fixed discharge port 57 with the processed object W with a large particle diameter.

Next, the effect of a horizontal rotary dryer is demonstrated.

If the scraping plate 61 is provided in the rotating cylinder 10 like the horizontal rotary dryer of this form, the microparticles | fine-particles C contained in the to-be-processed object W will be in the space inside the rotating cylinder 10. Since it disperse | distributes, this microparticles | fine-particles C can piggyback on the carrier gas A, and can be discharged | emitted with the carrier gas A through the fixed exhaust port 56 to the outside. As a result, the fine particles C contained in the object W can be classified and removed.

Moreover, each scraping plate 61 passes through the front end part of the discharge port 50 located in the back side with respect to the rotation direction R of the rotary cylinder 10, and also the shaft center of the rotary cylinder 10 is carried out. If it is arrange | positioned so that it may extend from the vicinity of the straight line parallel to a direction, the to-be-processed object W mounted on the scraping-up plate 61 will be located in the back side of the discharge port 50. FIG. Therefore, the workpiece W on the scraping plate 61 is prevented from directly entering the discharge port 50, so that the workpiece W in which the fine particles C are mixed is discharged through the discharge port 50. The probability of being discharged is reduced.

If the plurality of scraping plate rows 60 are intermittently positioned in the axial direction of the rotary cylinder 10, the workpiece W moving inside the rotary cylinder 10 is a portion where the scraping plate 61 exists. And alternate parts that do not exist. Therefore, the processed object W is scraped up several times, and the scraping up efficiency is improved.

In addition, if the scraping-up plate 61 is intermittently located so that it may be spaced at equal intervals from each other in the circumferential direction of the rotating cylinder 10, the to-be-processed object W can be scraped up efficiently. Specifically, the scraping plate row 60 which extends from the inner wall of the rotating cylinder 10 toward the shaft center and is a row of the scraping plate 61 which scrapes up the object W with the rotation of the rotating cylinder 10. ) Provided with a plurality of spaced apart in the circumferential direction, the carrier gas (A) is passed through the workpiece (W) falling from the scraping plate 61, so that many fine particles (C) It can be accompanied by A), and classification accuracy improves. Furthermore, there is a secondary advantage that the scraping plate row 60 increases the contact efficiency between the workpiece W and the steam tube 11, thereby increasing the drying efficiency.

In this embodiment, the scraping plate 61 of the scraping plate row 60 of at least the other end side (downstream side) of the scraping plate row 60 is based on the rotation direction R of the rotating cylinder 10, It has a proximal end of the scraping plate 61 at a position close to the front edge of the discharge port 50, and is in a positional relationship extending from the inner wall of the rotating cylinder 10 toward the shaft center. Therefore, many to-be-processed objects W can be collected and scraped up with the next discharge port 50 of the front of the rotating direction of the rotating cylinder 10 in front. As a result, compared with the kiln action, the to-be-processed object W is stirred more finely, and the classification effect of the to-be-processed object W can be improved.

Furthermore, in this embodiment, the scraping plate 61 extends from the base end toward the axis of the rotary cylinder 10, and the extended tip portion is configured to be bent forward on the basis of the rotational direction R of the rotary cylinder 10. It is. Therefore, more to-be-processed object W can be gathered and scraped up between the next discharge port 50 of the rotating cylinder 10 ahead of the rotation direction. As a result, the classification effect of the to-be-processed object W can be heightened more.

If the stirring means 65 which stirs the to-be-processed object W supplied in the rotating cylinder 10 is provided in the one end side of the rotating cylinder 10 rather than the scraping plate row 60, the scraping plate ( Since the to-be-processed object W is stirred before scraping off the to-be-processed object W by 61), the microparticles | fine-particles C which the to-be-processed object W contain are sorted out. As a result, the dispersion efficiency of the microparticles | fine-particles C by the scraping-up plate 61 improves. On the other hand, although the above stirring means 65 and the scraping plate 61 may not be provided, classification efficiency etc. improve when it is provided, and it becomes a more preferable apparatus.

The discharge port 50 moving in the circumferential direction accompanying the rotation of the rotary cylinder 10 provided on the circumferential wall of the rotary cylinder 10 and the lower portion of the classification hood 55 provided to cover the discharge port 50 are provided. When the fixed discharge port 57 which is fixed and does not move and the fixed exhaust port 56 provided in the upper part of the classification hood 55 are combined, the carrier gas (in the whole classification space including the settling area | region 90) Classification by A) and dispersion gas N is performed. That is, the fine particles (C) are guided upward with the carrier gas (A) and then discharged through the fixed exhaust port (56), and other particles are guided downward and discharged through the fixed discharge port (57). Classification is realized by this.

When the inside of the classification hood 55 above the rotating cylinder 10 becomes the settling area | region 90 which is a space filled with air, the comparatively large diameter particle | grains F entrained with the carrier gas A will settle the settling area | region 90 ) By the inertia and discharged through the fixed outlet (57).

If the blowing means 58 of the dispersion gas N is provided in the path | route of the to-be-processed object W above the fixed discharge port 57, it will fall with other to-be-processed object W toward the fixed discharge port 57. The fine particles C can be raised toward the fixed exhaust port 56. As a result, the classification and removal efficiency of the fine particles C is improved.

In this embodiment, the number of scraping plates 61 for each scraping plate row 60 may not be four, and it is not particularly limited, but the number of scraping plates 61 is 4 to 6 in order to secure the scraping capacity. desirable. The number per row of the outlets 50 is not particularly limited, but is preferably 10 to 17 in consideration of reduction in pressure loss, dispersion of fine particles (C), mechanical strength of the rotary cylinder 10 and the like.

INDUSTRIAL APPLICABILITY The present invention can be applied as a machine and a method for drying and classifying a target object such as coal. As the horizontal rotary dryer, a steam tube dryer (STD) is suitable, but a paddle mixer or the like may be used.

10: rotating cylinder 11: steam tube (heating means)
41: supply port 50: discharge port
55: classification hood 56: fixed exhaust port
57: fixed outlet 58: blowing means
61: scraping-up plate 65: stirring means
A: carrier gas E: processed material
N: dispersion gas N1: air
N2: inert gas W: workpiece

Claims (5)

A rotating cylinder rotatable about an axis having an supply port for the object and the carrier gas on one end and an outlet port for the object and the carrier gas on the other end;
Heating means for heating and drying the workpiece by heating the rotary tube in the process of supplying the workpiece through the supply port and discharging it through the discharge port;
A classification hood having a fixed discharge port for discharging the object to be processed in the lower portion and a fixed exhaust port for discharging the carrier gas in the upper portion and covering the other end side of the rotary cylinder; and
And a blow-up means for dispersing gas provided in a path from which the object to be treated in the classification hood reaches the fixed outlet.
The method of claim 1,
The blowing means of the dispersion gas is made of a pipe member for blowing up the dispersion gas through a hole formed in the peripheral wall,
And the pipe member is provided to cross the path of the workpiece to the fixed outlet.
The method of claim 1,
And said settling hood is provided with a settling region of the dispersed target object at a position above the height of said rotating cylinder.
The dry classification method of the to-be-processed object characterized by using coal as a to-be-processed object in the dry classifier of Claim 1.
The flow rate of the said dispersion gas in the dry classifier of Claim 1 is less than the flow volume of the carrier gas which blows in from the one end of the said rotating cylinder, The dry classification method of the to-be-processed object characterized by the above-mentioned.

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