BRPI1104139A2 - drying and sorting apparatus and drying and grading method of the material to be treated - Google Patents

Abstract

DRYING AND CLASSIFICATION APPARATUS AND DRYING AND CLASSIFICATION METHOD OF MATERIAL TO BE TREATED. A drying and grading apparatus is provided capable of efficiently drying and grading a material to be treated and a method of drying and grading it; the drying and sorting apparatus for the material to be treated includes: a rotating capsule having at one end one inlet for the material to be treated and the carrier gas at the other end having discharge openings for material and carrier gas which can rotate around the rod; a heating unit by heating and drying the material by heating an internal part of the rotary capsule during the course where the material to be treated feeds from the inlet and the material is discharged from the discharge openings; a sorting cap having a fixed outlet on one end of the material discharging the material and a fixed gas exhaust opening on the top expelling the carrier gas, which is provided to cover the tip on the other side of the rotating capsule; and a dispersion gas blasting unit provided on a route where material takes up in the classification hood when moving to the fixed outlet.

Description

"DRYING AND CLASSIFICATION APPARATUS AND DRYING AND CLASSIFICATION METHOD OF MATERIAL TO BE TREATED"

FIELD OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a

drying and grading apparatus performing the drying and grading of a material to be treated and the method of drying and grading thereof. In particular, the effect of the present invention is conspicuously exhibited when the material to be treated is coal. RELATED ARTICLE DESCRIPTION

Conventionally, when producing coke, since high quality coke coal (strong coke coal and weak coke coal) is expensive and not sufficiently supplied, coke production using a low coke property coal has been frequently conducted. Although the low coke property coal charge is used in a dry form, when the water content of the coke is 6.5% or less, the dispersion of fine coal particles of around 100 μιτι or less leads to a problem. deterioration of work and related environments. In addition, fine coal particles of around 300 μιη are placed in a coke oven as a material to be dried, which was the major cause of carbon adhesion to the coke oven. Therefore, in order to prevent the dispersion of dust in a coal transport equipment and the like and the adhesion of carbon to the coke oven, the fine particles which may cause such problems should be classified and removed using a grading apparatus installed before or after drying of the coal load.

Incidentally, for coal drying, a horizontal rotary dryer or a fluidized bed dryer was conventionally used. The horizontal rotary dryer requires less energy consumption than the fluidized bed dryer and thus it is considered advantageous in terms of equipment cost.

As a typical example of a conventional horizontal rotary dryer, the so-called steam pipe dryer (STD) was known. In drying using a steam tube dryer, the carrier gas is generally blown inward for the purpose of increasing drying and related effectiveness (e.g., as viewed in Japanese Patent Publication No. 2004- 44876). As shown in Fig. 7, the steam tube drier includes a rotatable capsule 110 which rotates about the center of the rod and by rotating the rotary capsule 110, the material to be dried feeds (carries) the side of one end of the rod. rotatable capsule 110 and is transported to the other end for unloading. During the course of this transport, the material is dried by steam heating as external drying heat.

More specifically, the rotatable capsule 110 has a length of 10 m to 30 m, for example, and between both end plates of the rotatable capsule 110, a large number of heating tubes 111 extend along the central direction of the rod to be heated when a heat vapor with a medium heat is provided. When the material to be dried, such as wet dust or granular dust, feeds the rotating capsule 110, the heated material to be dried, when brought into contact with the heating tubes 111, is sequentially moved toward an outlet 112. as the rotating capsule 110 rotates.

In addition, at one end of the rotary capsule 110 is a gas blow opening 113 for blowing carrier gas into the rotary capsule and the carrier gas is discharged, along with a vaporized gas generated in the rotary capsule 110, through a gas discharge port 122 for communicating with outlet 112 at the other end.

However, since this conventional horizontal rotary dryer does not have a sorting function, a sorting device next to the dryer needs to be installed to dry the coal and still sort and remove fine particles, resulting in increased equipment cost. Moreover, in the design of these appliances, only drying and grading are taken into account respectively and so when these appliances are used for drying and grading, they simply perform drying and grading sequentially, resulting in deterioration in handling. SUMMARY OF THE INVENTION

The main problem to be solved by the present invention is the provision of a drying and grading apparatus capable of efficiently drying and grading a material to be treated and the drying and grading method thereof.

The present invention solved the above problem

as follows:

Of the Invention according to Claim 1:

A drying and sorting apparatus for a material to be treated, comprising: a rotating capsule which has, on one side, an inlet for the material to be treated and the carrier gas has, on the other side, openings for discharge to the material and the carrier gas, which rotates around a central rod; a heating unit by heating and drying the material by heating an internal part of the rotating capsule during the stroke where the material to be treated feeds the inlet and the material is discharged from the discharge openings; a classification hood having a fixed outlet at one end discharging the treated material and a fixed gas exhaust opening at the top, releasing the carrier gas and which serves to cover the other side of the capsule roundabout; and a dispersion gas blasting unit in a route that the material takes on the classification hood when moving the fixed outlet. Operation and principal and effect are defined as follows: When carrier gas is discharged along with material from the discharge ports into the material, the relatively large diameter particle has the energy to ascend to where it rapidly reaches the limit due to gravity, so that such a particle begins to fall once the energy reaches the limit to be discharged out of the outlet fixed at the bottom portion of the grading hood along with the material not entrained in the carrier gas. On the other hand, a relatively small diameter particle enclosed in the carrier gas-entrained material is discharged outside the gas exhaust port fixed at the top of the rating hood while left in the carrier gas. Therefore, particles with relatively small diameter (fine particles) are classified and removed from the material.

In addition, when the dispersing gas is blasted, a fine particle which has fallen along with the non-entrained material in the carrier gas and a fine particle which has fallen due to its insufficient upward energy is blasted upwards in the dispersing gas. , which improves classification accuracy. In addition, when the dispersing gas is blasted in the route that the material takes on the classification layer when moving to the fixed outlet, the blasting effect certainly acts on the fine particles and, furthermore, since the unblasted material If it is discharged as if it were outside the fixed outlet at the bottom of the classification cover, it is not necessary to take into account the manner in which unblasted material should be guided to the fixed outlet. Of the Invention according to Claim 2:

The drying and sorting apparatus for the material to be treated according to claim 1, wherein: the dispersion gas blasting unit of a pipe blasts the dispersion gas over a hole formed in the peripheral wall of the pipe; and the pipe serves to cross the route the material takes when moving the fixed outlet.

The main operation and effect is as follows: When the dispersing gas blasting unit is made of the pipe crossing the route that the material takes as it moves from the fixed outlet, the discharge of the unblasted material is not obstructed if, for example, the pipes are installed at appropriate intervals. In addition, blasting the dispersion gas from the hole formed in the peripheral wall of the tube ensures the blasting effect. From the Invention according to Claim 3: The drying and sorting apparatus for the

The material to be treated according to claim 1, wherein, in the classification layer, an establishment area for the dispersed material is formed at a higher position than the height of the rotatable capsule.

The main operation and effect is as follows: Forming the settling area on the sorting hood at the position above the rotating capsule ensures the above mentioned sorting and the removal of fine particles in the settling area, leading to improved grading accuracy.

From the Invention according to Claim 4: A method of drying and grading for the

material to be treated, wherein the coal is used as the material to be treated in the drying and sorting apparatus according to claim 1.

The main operation and effect is as follows: When the carrier gas is discharged with the coal from the other end of the rotary capsule, a relatively large diameter particle enclosed in the carrier gas enters the energy to rapidly ascend and reach the limit. due to gravity in the sorting space after discharge, so that the particle begins to fall once the energy reaches the limit to be directed downward into the sorting space with coal not entrained in the carrier gas. On the other hand, a particle with a relatively small diameter in the entrained carrier gas is directed upwards into the classification space while left in the carrier gas. Thus, it is possible to classify and remove the relatively small diameter particle (fine particles) from the dry coal. Of the Invention according to Claim 5:

A drying and grading method for the material to be treated, wherein in the drying and grading apparatus according to claim 1, a dispersion gas flow rate is less than a blown carrier gas flow rate from one end of the rotating capsule. .

The main operation and effect is as follows: Establishing the dispersion gas flow rate below the blown carrier gas flow rate at one end of the rotary capsule prevents the dispersion gas from affecting the distribution of the carrier gas in the rotary capsule and as a result , prevents the dispersing gas from affecting the drying of the material.

The main effect of the invention according to the present invention is a material to be treated which is dried and classified efficiently.

BRIEF DESCRIPTION OF DRAWINGS

Fig. 1 is a front view of a horizontal rotary dryer according to a representation of the present invention;

Fig. 2 is an enlarged view on the other side of a rotating capsule, with a classification cap being omitted;

Fig. 3 is a view along the line X-X Fig. 1;

Fig. 4 is an enlarged view of the cover of

classification;

Fig. 5 is an enlarged view of a dispersion gas blasting unit; Fig. 6 (a) and Fig. 6 (b) are explanatory views of the dispersion gas blasting unit view;

Fig. 7 is a perspective view of a conventional steam tube dryer; Fig. 8 is a flow chart of a drying step and

classification of a first representation; and

Fig. 9 is a flow chart of a drying and classification step of a second representation. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The following is a representation of the present invention.

will be described.

Fig. 1 shows a horizontal rotary dryer used for drying and grading according to this representation. The horizontal rotary dryer has a cylindrical rotary capsule 10 which is installed so that the center of the rod of the same inclines slightly in a horizontal plane with one end of it being higher than the other end. From the underside of the rotary capsule 10, the two support units 20 and the motor unit 30 are installed to support the rotary capsule 10, and the motor unit 30 allows the rotary capsule 10 to freely rotate around the center of the rod. . The rotating capsule 10 is designed to rotate counterclockwise (in an arrow direction R) in the illustrated example and its rotational speed is set to less than 1 m / s in terms of circumferential speed, for example.

Within the rotatable capsule 10, a large number of vapor tubes 11, each being a metal tube allowing steam or something relative as a medium heat to pass through, are attached to extend along the central direction of the capsule rod. rotary 10. A plurality of steam pipes 11 are arranged in each of the circumferential directions and one radial direction to form concentric circles around the center of the rotary capsule rod 10, for example.

As shown in Fig. 2, a plurality of discharge openings 50 are formed to pass through a peripheral wall of the rotatable capsule 10 of the other end. The multiple discharge openings 50 are formed in two lines extending along the circumferential direction of the rotating capsule 10, and are formed separately from each other. Furthermore, the multiple discharge openings 50 are all formed in the same format, but may have different formats. io As shown in Fig. 3, inside the rotating capsule

10, a plurality of elevators 61 are installed to extend from an inner wall of the rotary capsule 10 toward the center of the rotary capsule rod 10. The multiple elevators 61 are arranged in a plurality of rows, in three rows in the illustrated example, which are separated from each other in the direction of the rod as shown in Fig. 1. The rows 60 of the elevators are composed of a plurality of four, in the illustrated example, elevators 61 which are arranged at equal intervals as shown in Fig. 3.

The elevators 61 are made of thick material and are in a hook shape with its tip being bent toward the front side in terms of the rotational direction R of the rotary capsule 10. The elevator extension length 61 is set to 1/10 3/10 of the inner diameter D of the rotary capsule 10, for example.

Moreover, the elevators 61 are arranged to extend from the vicinity of a straight line passing through a tip on the front side of the discharge opening 50 located at the rear in terms of the rotational direction R of the rotating capsule 10 and being parallel to the direction of the center of the rotary capsule rod 10. Thus, in the immediate vicinity of the front side of each of the elevators 61, the discharge opening 50 does not exist, but the inner wall of the rotary capsule 10 exists.

As shown in Fig. 1, the rows 60 of the lifts are arranged in the rotating capsule 10 between the discharge openings 50 and the inlet 41 described hereinafter, and do not exist in positions closer to the other end than the discharge openings 50. In addition, the rows 60 of the lifts are arranged in parts closest to the discharge openings 50, between the discharge openings 50 and the inlet 41.

io As shown in Fig. 1, in the rotating capsule 10, in the

closer position on one side of the tip of the rotating capsule 10 than the rows 60 of the elevators there is installed a stirring unit 65 which agitates the material W which fed (loaded) the rotating capsule 10. The stirring unit 65 is also distant from the rows 60 of the elevators arranged closest to one end in the rotary capsule 10. As a stirring unit 65, a well-known nail type, reverse shovel or the like may be used, for example. Among all, it is especially preferable to choose the reverse blade, in view of a fine particle separation (dispersion) effect and a structural limitation of the STD. As shown in Fig. 1 and Fig. 4, a cover of

55 capable of discharging material W and carrier A serves to cover the other side of the tip having multiple discharge openings 50. The classification hood 55 is made of a thick material as shown in Fig. 3, it has , at the bottom surface of its lower portion 55d, a fixed outlet 57 for dry and classified material W, i.e. for a treated substance E, and has a gas exhaust vent on the top surface of top 55u 56 is fixed for carrier gas A. In addition, in classification hood 55, the upper 55u becomes narrower in terms of width direction perpendicular to the direction of the rod as it moves toward the gas exhaust port. 56, and similarly, the lower portion 55d also becomes narrower in width direction as it goes toward the fixed outlet 57. The fixed gas exhaust port 56 and the fixed outlet 57 are located substantially in the central portion of the rating hood 55 in a plan view.

An inner portion of the sorting cover 55 is an air-filled sorting space, and in particular a portion in the sorting cover 55 above the rotatable capsule 10 (variation shown by reference L) is an establishment area 90. This that is, the grading cover io 55 is for the establishment area 90 to be formed above the rotating capsule 10. In addition, the grading cover 55 is secured to the ground by a unit not shown so that it does not rotate according to rotation. of the rotating capsule 10.

The fixed gas exhaust opening 56 is opened upwards as shown in Fig. 8 and Fig. 9 and is connected to the dust abatement unit 201. From the fixed gas exhaust opening 56 , the carrier gas A escapes along with the vaporized gas and the fine particles C are discharged as well. In addition, the fixed outlet 57 is also opened in the up and down directions and is connected to the conveyor unit 204 as well as a conveyor belt. From fixed outlet 57, treated substance E is discharged after fine particles C are classified and removed.

A separation distance L between an upper edge of the rotary capsule 10 and the fixed gas exhaust port 56 relative to the inside diameter D of the rotatable capsule 10 is preferable L> 0.3D, and more preferably 0.8D <L <4, 0D, and especially preferable 1.0D <L <2.5D. When the separation distance L is 0.3'D or less, the sorting function cannot be fully displayed and relatively large diameter F particles are also discharged with carrier gas A through the fixed gas exhaust vent 56 possibly causing a decrease in classification accuracy and an increase in the load of the dust abatement unit 201. On the other hand, the separation distance L being 4, OD or greater means the presence of a space whose length is equal to or greater than than the separation distance for classification, which is not economical.

Furthermore, in the establishment area 90, as shown in Fig. 4, the classification cap 55 becomes wide in the direction of the rod. Making the grading cap 55 wide in the direction of the rod in settlement area 90 decreases the likelihood that fine particles C will collide with other F particles and also the grading cap 55 (in particular, walls 55A, 55B rating cap 55 at both ends in the direction of the rod), which improves classification accuracy. It should be noted that "becomes broad in the direction of the rod" means "becomes broader compared to a portion of the rating cap connection with the rotating capsule 10".

Settlement area 90 need not become wide in the direction of the rod above its full length in terms of up and down direction. In the vicinity of the rotating capsule 10, since fine particles C, among others, are those being simply discharged from the rotating capsule 10 through the discharge openings 50 and do not spread in a flat direction, the settlement area 90 is not wide. towards the rod, as in the illustrated example, is also adopted. Further, at the upper 55u of the rating cap 55, the rating cap 55 preferably becomes narrower in direction of the rod as it moves toward the fixed gas exhaust port 56, as in the example. illustrated.

A degree in which the sorting cap 55 becomes wide is preferable 1.5Z1 <Z2 <6Z1, preferably 2Z1 <Z2 <4Z1, where Zl is the rod length of the connecting portion of the sorting cap with the rotating capsule. 10 and Z2 is the length in the rod direction of the broad portion of the rating cover.

As shown in Fig. 3 and Fig. 4, in shop area 90, a plurality of brackets (62, 63) are between wall 55A on one side of rod direction and wall 55B on other side in rod direction 55. When the rating cap 55 becomes wide in the direction of the rod, its strength may decrease, but by providing several brackets (62, 63) between the wall 55A on one side of the rod direction and the wall 55B on the other. side toward the rod maintains the strength of the io 55 rating cover. Incidentally, the brackets (62, 63) may also lie between wall 55A and the other wall 55B in the rating cover portion 55, not becoming wide in the direction stem as in the illustrated example.

The brackets for maintaining the strength of the rating cap 55 may be made only of linear bars, tubes or the like, but in this embodiment they are composed of tubes 62 and umbrellas 63 disposed on tubes 62. Umbrella 63 has a umbrella shape with its center in the upwardly projecting width direction and is arranged to extend along one direction of the pipe extension 62. The presence of the umbrellas 63 prevents the deposition of material W on the 62. Umbrellas 63 may or may have the function of maintaining the strength of the rating cover 55.

As previously described, the upper 55u of the rating hood 55 becomes narrower in width direction as it goes towards the fixed gas exhaust opening 56, in which case it is preferable that the brackets (62, 63) do not are located under the fixed gas exhaust port 56, as shown in Fig. 3. As the upper 55u of the rating cap 55 becomes narrower in direction of the rod as it moves toward the Fixed gas exhaust 56 flows along the walls becoming narrower, occurring as shown in Fig. 3, and the fine particles C go into flow SI. Thus, rising C particles do not collide with the ceiling surface of the grading hood 55 and thus do not fall, which increases the accuracy of the grading. Furthermore, within the classification layer 55, not only the above-mentioned S1 flows occur along the walls, but also a vertically upward flow S2 in the center occurs mainly, and the same particles C also go in the S2 flow. Thus, when the multiple supports (62, 63) are not located under the fixed gas exhaust vent 56, the fine particles C going in the upwardly rising center flow S2 do not collide with the supports (62, 63) and thus io fall, which improves classification accuracy.

As shown in Fig. 3, within rating hood 55, a blasting unit 58 for dispersing gas N is provided on a route where material W passes to reach fixed outlet 57 due to its free fall from the discharge openings 50. rotating capsule 10, that is, under the rotating capsule 10. When the dispersing gas N is thus blasted into the inner part (classification space) of the classification layer 55, the fine particles C having fallen with the material not entangled in the carrier gas A and fine particles C that have fallen due to their insufficient upward energy are blasted by the dispersing gas Ν, which improves classification accuracy. Furthermore, when the dispersing gas N is blasted in the route material W takes on moving from the fixed outlet 57, the blasting effect surely acts on the fine particles C discharged from the inside of the rotating capsule 10 while enveloped with the material. W is not entangled in carrier gas A and free-falls, and furthermore unblasted material W is discharged out as if it were treated substance E from the fixed outlet 57 on the bottom surface of the classification hood 55 and then , it is not necessary to consider how unblasted W material should be directed to the fixed outlet 57. As described above, in this representation, using not only settlement area 90, but also the entire sorting space (inner part of the sorting cover 55), the fine particles C in material W are directed upwards with the carrier gas A, and the exclusive fine particle material W is directed downwards.

A particular form of the N-dispersing gas blasting unit 58 is not particularly limited and may be composed of, for example, a distribution plate made of a mesh or the like and a N-dispersing gas blasting unit up through the network openings. 10 Incidentally, a possible structure such as that considered above when the blasting unit 58 is not supplied in the route material W takes as it moves to the fixed outlet 57 may be to tilt the distribution plate towards the fixed outlet 57. but even if the distribution plate is tilted, unblasted material W is deposited on the distribution plate, which needs further consideration for directing material W to the fixed outlet 57.

On the other hand, in this embodiment, as shown in Fig. 5, Fig. 6 (a) and Fig. 6 (b), the blasting unit 58 for dispersing gas N includes tubes 58A crossing the route material W takes. moving to fixed outlet 57 and having holes 58Ac in its peripheral walls so that dispersing gas N is blasted upwards from holes 58Ac formed in tubes 58A. Since the blasting unit 58 for dispersion gas N is composed of tubes 58A crossing the route material W takes when moving to fixed outlet 57, there is no need to consider how material W is not blasted upwards to In addition, since the dispersing gas N is blasted from the holes 58Ac formed in the peripheral walls of the tubes 58A, the blasting effect acts on the fine particles C. In this embodiment, the holes 58Ac formed in the wall The peripheral portions of each of the tubes 58A are circular in shape, and several of them at appropriate intervals are provided to an extent of the direction of the tube 58A. Further, the holes 58Ac are formed so that the dispersing gas N is blasted up indirectly as shown in Fig. 6 (a).

The multiple tubes 58A are preferably arranged parallel to the fixed outlet 57, each extending towards the rod as in the illustrated example. In such an arrangement, the dispersion gas N is sprayed on material W trying to fall between adjacent pipes 58A so that fine particles C are blasted by the dispersion gas N and on the other hand so that material W unblasted drop between tubes 58A to be discharged as treated substance E to the other side of fixed outlet 57. Fine particles C blasted by dispersing gas N fly into classification hood 55 and then blown by carrier gas A to discharged out of the fixed gas exhaust port 56.

Tube groups, each consisting of multiple tubes 58A, may be supplied in multiple alignments, being split upwards. In addition, according to a quantity of the falling material W, the amount of blasting dispersion gas N from each of the holes 58Ac may vary. Furthermore, as in this embodiment, the umbrellas 58B may be arranged in the respective tubes 58A as in this embodiment. The umbrella 58B is in an umbrella shape with its center toward the upwardly projecting width, and it extends along the direction extension of the tube 58A. The presence of the 58B umbrellas more safely prevents material W from being deposited on the tubes 58A.

Like the dispersion of gas N, for example, an inert gas such as nitrogen or argon, or the like is usable over air, and it can be chosen depending on the properties of the material W to be treated. However, when the material W to be treated is flammable like coal or is one that causes dust explosion, the inert gas is preferably used.

In this representation, as shown in Fig. 8, inert gas N2 as nitrogen is mixed into air N1 and this mixed gas is heated using an average heat S such as steam in a heat converter 205 so that it can be used as gas. N dispersion

A proportion of the inert gas mixture N2 in air N1 is not particularly limited, but when the material W to be treated is flammable like coal or is one that causes dust explosion, the inert gas N2 is preferably mixed so that the concentration of oxygen from the gas released from the gas exhaust port 56 becomes 13% or less, more preferably 12% or less. The oxygen concentration is thus reduced so that the explosion of fine coal particles C or the like can be prevented. Incidentally, carrier gas A contains evaporated water vapor when material W is dried and thus oxygen concentration is low. Therefore, there is a great possibility that carrier gas A will cause fine particles C to explode. That is: problems caused by the explosion become significant when the dispersion gas N is blasted. Increasing the Inert Gas Mixing Ratio

N2 requires a high cost, but the dispersing gas N is merely expelled from a chimney 203 after the dispersing gas N is expelled with the carrier gas A and so on from the fixed gas exhaust opening 56 and the fine particles C are removed by dust abatement unit 201 to which conveyor unit 202, such as a conveyor belt, is connected. *

Thus, as shown in Fig. 9, the gas expelled from the fixed gas exhaust port 56 is preferably reused as dispersing gas N after fine particles C are removed by dust abatement unit 201. Carrier gas A ( including the dispersing gas N) discharged from the inside (sorting space) of the sorting hood 55 has a low oxygen concentration and has also been heated and thus carrier gas A after the fine particles C are removed can be removed. suitably used as dispersion gas N. Of course, carrier gas A can be properly heated using a heat converter 205.

The carrier gas A expelled from the fixed gas exhaust port 56 may be used entirely as dispersion gas N, but it is also possible to use only part of it and expel the rest in the atmosphere through the chimney 203 as in the illustrated example. However, a dispersion gas flow rate N is preferably smaller than a carrier gas flow rate A blown from one end of the rotary cap 10, and it is preferable to be 1/5 to 1/2 of the flow gas flow rate. A. Since the dispersion gas flow rate N is thus smaller than the flow of the flow gas A blown from one end of the rotary cap 10, the dispersion gas N does not affect the distribution of the flow gas A at rotary capsule 10, and as a result, does not affect the drying of material W.

Here, when the material W to be treated is flammable like coal or is one that causes dust to explode, it is desirable that the oxygen concentration of the gas released from the gas exhaust vent 56 is 13% or less (preferably 12%). or smaller). An appropriate method, although not shown, measures (monitors) the oxygen concentration of the exhaust gas from the fixed gas exhaust port 56 by an oxygen concentration meter and, when the measured value exceeds a prescribed value, to mix inert gas. to the dispersion gas N so that the measured value becomes the prescribed value or less.

On the other side of the rotatable capsule 10, as shown in Fig. 1, there is provided a feed tube 70 feeding the steam tubes 11 and a steam drain tube 71. In addition, on the other side of the rotary capsule 10, a helical feeder 42 including a screw therein and in a cylindrical shape is installed to be fitted to the rotary capsule 10. At one end of the helical feeder 42, a steering unit is provided. 43 like a motor by turning the screw provided on the helical feeder 42. In addition, an upper part of the helical feeder 42, an inlet 41 is open, and the inlet 41 and the inside of the helical feeder 42 communicate with each other. other.

Material W to be dried by the horizontal rotary dryer according to this representation feeds the helical feeder 42 from the inlet 41 and feeds the rotary capsule 10 by turning the screw installed on the helical feeder 42 with the steering unit 43. In addition, near to the helical feeder 42, a gas supply unit not shown is provided to blow air, inert gas, or the like, such as carrier gas A in the rotary cap 10 of inlet 41, which also serves as a blowout opening. gas. The carrier gas A blown with the gas blower unit is conveyed to the tip on the other side of the rotary capsule to be dispensed within the rotary capsule 10.

Following is a horizontal dryer operation

rotary will be described.

To dry the material W in the horizontal rotary dryer, the material W to be treated is fed into the inlet 41 as shown in Fig. 1. The material W which feeds the opening 41 is loaded into the rotating capsule 10 by the helical feeder 42 and conveyed to the other end of the rotatable capsule 10 as it is dried being brought into contact with steam-heated steam pipes 11 (drying step).

When material W reaches agitation unit 65, it is agitated by agitation unit 65 and subsequently raised by elevators 61 rotated according to the rotation of the rotary capsule 10, as shown in Fig. 3. When material is lifted by elevator 61 positioned on the top side of the rotating capsule 10, the lifted material W falls free-fall and at that moment the fine particles included in the material W are dispersed in the rotating capsule 10 (called the "flying" action).

On the other hand, carrier gas A blown from inlet 41 by the supplied blow unit on one side of the rotary capsule 10 passes into the rotary capsule 10 and is expelled outside the rotary capsule 10 from the discharge openings. 50 which are also exited to material W. At that time, carrier gas A is expelled from the discharge openings 50, along with the fine particles C, which were dispersed in the rotatable capsule 10 by the elevators 61. The carrier gas A , which has been expelled from the openings 50, is expelled along with the fine particles C from the inner part (classification space) of the classification hood 55 by means of the fixed gas exhaust opening 56. In addition, the exhaust gas Dispersion N is inserted to be blasted towards the upper side of the classification hood 55 by the blasting unit 58 for the dispersing gas Ν. The dispersion gas flow rate N is normally lower than the carrier gas flow rate A. It should be noted that a carrier gas velocity A is, for example, 5 to 10 m / s when expelled from the openings. The velocity is appropriately adjusted based on the area of each of the discharge openings 50 and the amount of carrier gas A.

In material W, heavy particles having a large particle size fall into the rotatable capsule 10 and free fall from the discharge openings 50 located on a lower side without being entangled in the carrier gas A. The particles (material W) that fall into free fall are no longer blasted by dispersing gas N, but pass between tubes 58A to be discharged as treated substance E out of fixed outlet 57. In addition, in material W, particles F with a relatively large diameter, although entrained in the carrier gas A to be discharged from the discharge ports 50, are relatively heavy and do not reach the fixed gas exhaust port 56 along with the carrier gas A and fall to be discharged together. with treated material W with a large particle size from fixed outlet 57 as treated substance E.

Next, the effects of the horizontal dryer function

rotary will be described.

When the elevators 61 are provided in the rotary capsule 10 as in the horizontal rotary dryer, according to this representation, the fine particles C included in material W are dispersed in the space in the rotary capsule 10 so that the fine particles C can be loaded into the carrier gas A and being discharged on the other side of the fixed gas exhaust port 56 together with carrier gas A. As a result, fine particles C included in material W can be classified and removed.

In addition, when the elevators 61 are each

arranged in the vicinity of the straight line passing through the front side of the discharge opening portion 50 located on its rear side in terms of the rotational direction R of the rotary capsule 10 and being parallel to the center direction of the rotary capsule rod 10 , material W placed in elevator 61 is located on the rear side of discharge opening 50. Thus, material W in elevators 61 can be prevented from directly entering discharge openings 50, which decreases the likelihood that material W in a state of inclusion of fine particles C is discharged from the

discharge openings 50. When the multiple rows 60 of the elevators are

intermittently located along the central direction of the rotary capsule rod 10, material W moves in rotary capsule 10 to pass alternately in the presence of elevators 61 and in the absence of elevators 61. In this case, elevation of material W is driven by several sometimes, which improves the lifting efficiency.

Further, when the elevators 61 are intermittently located along the circumferential direction of the rotating capsule 10 at equal intervals, the material W can be raised efficiently. Specifically, when the multiple rows 60 of the elevators, which are formed by providing a plurality of elevators 61, each extending from the inner wall of the rotating capsule 10 toward the center of the rod to elevate material W as The rotating capsule 10 rotates, at intervals in the circumferential direction, the carrier gas A passes through the material W falling from the elevators 61. This allows a batch of fine particles C to be entrained in the carrier gas A, which increases the classification accuracy. In addition, there is also a secondary advantage that rows 60 increase the contact efficiency between material W and steam pipes 11, resulting in a great drying efficiency.

In this embodiment, in a positional relationship between the elevator row 60 and the elevator 61 of row 60 at least at the other end (underside) of the elevator rows 60, the base tips of such elevators 61 are positioned near the edges of the elevator. front side of the discharge openings 50 in terms of the rotational direction R of the rotary capsule 10 and extend from the inner wall of the rotatable capsule 10 towards the center of the rod. Thus a large amount of material W can be stored and raised between the plate and the subsequent discharge opening 50 in terms of the rotational direction of the rotary capsule 10. As a result, compared to the furnace action, this case allows material W shake more smoothly with high efficiency in its rating.

Further, in this embodiment, the elevator 61 extends from the base tip towards the center of the rotary capsule rod 10, and the extended tip portion thereof is formed to bend forward in terms of the rotational direction R of the capsule Therefore, a large amount of material W can be stored and raised between the plate and the subsequent discharge opening 50 in terms of the rotational direction of the rotary capsule 10. As a result, the classification effect for material W can be improved. .

When the stirring unit 65 is supplied farther to the end on the other side of the rotating capsule 10 than the elevator rows 60, the fine particles included in material W cannot be separated, because material W feeding the rotating capsule 10 can be agitated before the elevators 61 lift him up. Accordingly, the fine particles may be dispersed with high efficiency by the elevators 61. Incidentally, it is also possible not to provide the aforementioned stirring unit 65 and the elevators 61, but providing them improves the classification efficiency, resulting in an improved apparatus. By the combination of the discharge openings 50 which

are provided on the peripheral wall of the rotatable capsule 10 and move in the circumferential direction according to the rotation of the rotatable capsule 10, the fixed outlet 57 which is provided at the bottom part of the rating cap 55 installed to cover the discharge openings 50 and which never moves because it is stationary, and the fixed gas exhaust port 56 provided at the top of the classification hood 55, the carrier gas A and dispersion gas N classification occurs throughout the classification space, including the area Specifically, after the fine particles C are directed upwards as the entrained particles in the carrier gas A, the particles C are discharged from the gas exhaust port 56 and the other particles are directed downwards from fixed output 57, which assumes classification.

When the inner portion of upper 55u corresponds to settlement area 90 as the air-filled space, relatively large diameter F particles fall inertially into settlement chamber 90 to be discharged from outlet 57 as the gas-entrained particles drag A.

When the blasting unit 58 for the dispersing gas N is provided in the material route W above the fixed outlet 57, the fine particles C falling to the fixed outlet 57 along with the other material W may rise toward the exhaust vent of fixed gas 56, resulting in improved efficiency in the classification and removal of fine C particles.

In this embodiment, the number of lifts 61 for each row of lifts 60 need not be four and is not particularly limited, but it is preferable to be from 4 to 6 to ensure a lift volume. In addition, the number of gas exhaust ports 50 per line is not particularly limited, but is preferably between 10 to 17, in consideration of pressure reduction, fine particle dispersion, mechanical strength of the rotary capsule 10 and the like.

The present invention is applicable as a drying and grading apparatus and a drying and grading method for a material to be treated such as coal. Like the horizontal rotary dryer, a steam tube dryer (STD) is suitable, but may be a paddle mixer.

Explanation of Numbers and Symbols

rotary capsule 11 steam tube (heating unit) 41 inlet 50 discharge opening 55 rating hood 56 fixed gas exhaust opening 57 fixed outlet 58 blasting unit 61 elevator 65 stirring unit Carrier gas

And treated substance

N dispersing gas

Nl ar

N2 Inert Gas

W material

Claims (5)

1. "DRYING AND CLASSIFICATION APPARATUS AND DRYING AND CLASSIFICATION METHOD OF THE MATERIAL TO BE TREATED" means a dryer and a sorting apparatus for a material to be treated, comprising: a rotating capsule having, on one side, a inlet for the material to be treated and for the carrier gas and has, at the other end, discharge openings for the material and for the carrier gas; the unit heating and drying the material by heating an internal part of the rotating capsule during the course where the material to be treated is fed from the inlet and the material is discharged from the discharge openings; a classification hood having a fixed outlet at one end discharging the treated material and at a top portion having a fixed gas exhaust vent expelling the carrier gas and which is provided to cover the tip on the other side of the rotating capsule; and a dispersion gas blasting unit provided in a route that the material takes on the classification hood when moving to the fixed outlet. "Drying and grading apparatus for the material to be treated" according to Claim 1, characterized in that the dispersing gas blasting unit is made of a tube blasting the dispersing gas from a hole formed in a peripheral wall. of the tube; and the tube is provided to cross the route the material takes as it moves to the fixed outlet. 3. "DRYING AND CLASSIFICATION APPARATUS FOR MATERIALS TO BE TREATED" according to classification 1, characterized in that the classification layer, an area of establishment for the dispersed material, is formed at a position higher than height of the rotating capsule. 4. "Drying and grading apparatus for the material to be treated", characterized in that coal is used as the material to be treated in the drying and grading apparatus according to claim 1. 5. "DRYING AND CLASSIFICATION METHOD OF THE MATERIAL TO BE TREATED", characterized in that in the drying and grading apparatus according to claim 1, a dispersion gas flow rate is less than a blown carrier gas flow rate. one end of the rotating capsule.