JP6133044B2 - Drying equipment - Google Patents

Description

  The present invention relates to a drying apparatus that introduces a material to be dried from a stirrer to a heat exchanger by airflow conveyance.

  As a drying device for drying wet materials such as sludge, from a stirrer to which the material to be dried is supplied from a feeder, an air flow type dryer for drying the material to be dried conveyed from the stirrer, and an air flow type dryer A solid-gas separation means for separating the discharged dry matter from the air stream, and a part of the dry matter separated by the solid-gas separation means is circulated to the feeder as a dry matter for moisture adjustment, while the rest is It is known to discharge out of the system as a processed dried product (for example, Patent Document 1).

JP 2010-210162 A

  There are various types of objects to be dried by such a drying apparatus. However, it has been found that an inherent problem occurs in the case of a material having a strong adhesive force. That is, the to-be-dried material splashed upward by the stirrer adheres to the inner surface of the stirrer. And even if it adheres once, it falls with time in most cases, but there are some that completely dry while attached. Such a dried material to be dried peels off in a relatively large lump state and is transported as it is, which causes problems such as clogging in a downstream heat exchanger.

  This invention is made | formed in view of such a point, The place made into the objective is to prevent drying of the to-be-dried object in a stirrer by a simple method in a drying apparatus.

  In order to achieve the above object, in the present invention, the agitation conveyance path and the air current conveyance path are not crossed in the agitator.

Specifically, the first aspect of the present invention is an air current conveying path for air conveying an object to be dried,
A heat exchanger,
A stirrer provided with a stirring transport path for stirring and transporting the material to be dried supplied from the supply port by means of a stirring shaft while adjusting moisture;
The present invention is directed to a drying apparatus including an airflow dryer that transports the material to be dried stirred and transported by the stirrer by airflow through the airflow transport path and dries it by the heat exchanger.

And the said drying apparatus is
The stirring shaft extends horizontally,
It is connected to an inflow space formed on the downstream side of the agitation transport path, and includes an air current transport duct that feeds the material to be dried flowing into the inflow space from the discharge port of the agitator to the air current transport path.

  According to said structure, the to-be-dried material which flowed into inflow space is sent into an airflow conveyance path by the conveyance airflow sent by the duct for airflow conveyance. At this time, since the airflow for conveyance flows from the inflow space to the airflow conveyance path, the airflow for conveyance does not contact the object to be dried while stirring, and the object to be dried dries more than necessary and adheres to the inner surface of the agitator. Is prevented.

In the first invention, further,
Provided with a dam plate that dams the material to be dried downstream of the agitation transport path ,
The inflow space is formed further downstream of the dam plate, and the material to be dried that has flowed into the inflow space beyond the dam plate is fed into the airflow conveyance path.

  According to the above configuration, since the stirring conveyance path in the stirrer and the inflow space communicating with the airflow conveyance duct are separated by the weir plate, the conveyance airflow does not contact the object to be dried without being dried. An object is reliably prevented from drying more than necessary and adhering to the inner surface of the agitator.

The second invention, in addition to the first invention,
The airflow conveying duct is connected to a side surface of the agitator on the side of the inflow space,
The discharge port is formed above the inflow space,
The to-be-dried object is configured to be transported to the discharge port by a transport airflow that flows into the inflow space from the airflow transport duct.

  According to said structure, since the conveyance airflow which flowed into inflow space flows into a discharge port, without exceeding a dam plate, it pushes up to-be-dried material and sends it to a discharge port.

In addition to the first invention, the third invention is
The discharge port is formed below the inflow space in the stirrer,
The airflow conveyance duct is connected to the discharge port and configured to carry the air to be dried which has fallen from the discharge port.

  According to said structure, the to-be-dried object which exceeded the dam plate falls in an inflow space, flows into the duct for airflow conveyance through the discharge port, and is airflow conveyed. For this reason, the airflow for conveyance does not enter the stirring and conveying path from the airflow conveying duct.

The fourth invention is directed to a drying apparatus similar to the first invention,
The drying device
The stirring shaft extends horizontally,
It is connected to an inflow space formed on the downstream side of the discharge port of the stirrer, and includes an airflow conveyance duct for feeding the material to be dried flowing into the inflow space into the airflow conveyance path.

According to said structure, the to-be-dried material which flowed into inflow space is sent into an airflow conveyance path by the conveyance airflow sent by the duct for airflow conveyance. At this time, since the airflow for conveyance flows from the inflow space to the airflow conveyance path, the airflow for conveyance does not contact the object to be dried while stirring, and the object to be dried dries more than necessary and adheres to the inner surface of the agitator. Is prevented.

According to the present invention, in the drying apparatus, the inflow space is formed on the downstream side of the agitating and conveying path inside the agitator having the horizontally extending agitating shaft, and the airflow conveying duct is connected to the inflow space, thereby simplifying By this method, drying of the material to be dried in the stirrer can be prevented, and the material to be dried can be prevented from adhering in the stirrer.

It is sectional drawing which expands and shows a stirrer. It is a schematic block diagram which shows the drying apparatus in this embodiment. It is the FIG. 1 equivalent view which shows the drying apparatus in other embodiment. FIG. 2 is a view corresponding to FIG. 1 and showing a drying apparatus according to another embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  FIG. 2 is a schematic configuration diagram showing the drying device 1 in the present embodiment. FIG. 1 is an enlarged cross-sectional view of the stirrer 12 in the drying apparatus 1.

  The drying device 1 is a device for drying an object to be dried A that is a wet material such as sludge. As shown in FIG. 2, the supply device 11, the stirrer 12, and the first and second air flow conveying paths 13. , 14, an air flow dryer 15, a circulation cyclone 17 and a discharge cyclone 18 which are solid-gas separation means, and a circulation fan 19.

  The supply device 11 is configured to supply the supplied material A to the stirrer 12 by screw conveyance.

  The stirrer 12 is disposed below the supply unit 11 and has a stirring shaft 21 for stirring the material A to be dried supplied from the supply unit 11. A supply port 12a and a discharge port 12b are formed on the upper surfaces of both ends of the stirrer 12, respectively. The supply port 12a is connected to a material supply duct 11a extending from the supply machine 11 and a dry matter transporting duct 23 for supplying the moisture adjusting dry matter B1 from the circulation cyclone 17. Then, the stirrer 12 agitates and mixes the material to be dried A supplied to the supply port 12a with the stirring blade 21a together with the dried product B1 for moisture adjustment supplied to the supply port 12a, and adjusts the moisture. It is designed to transport while. Although not shown in detail, the stirrer 12 includes a bearing for supporting the stirring shaft 21 and a motor for rotating the stirring shaft 21.

  A dam plate 40 that supports one end of the agitation shaft 21 and dams the material A to be dried is provided on the downstream side of the agitator 12. The downstream side partitioned by the weir plate 40 (in other words, the vicinity immediately below the discharge port 12b) is a hollow inflow space 41 into which the airflow C for conveyance flows. The agitation shaft 21 may extend on the inflow space 41 side, and the agitation blade 21a may also exist in the inflow space 41.

  The airflow conveying duct 22 is connected to the inflow space 41 from the side surface of the stirrer 12 (specifically, the back surface of FIG. 2). Moreover, the lower end of the 1st airflow conveyance path 13 comprised by the duct extended in an up-down direction is connected to the downstream of the conveyance direction in the stirrer 12. As shown in FIG.

  When the material to be dried A reaches the weir plate 40, it has already been adjusted to an appropriate amount of water. Finally, it is scraped up by the stirring blade 21a and passes through the weir plate 40 to reach the inflow space 41. The to-be-dried object A, which has been raised by the transport airflow C flowing in from the airflow transport duct 22 and discharged from the discharge port 12b and whose moisture has been adjusted by the stirrer 12, together with the transport airflow C, is supplied to the first airflow transport path 13. To be supplied. In the first airflow conveyance path 13, the material A to be dried is airflow-conveyed together with the airflow C for conveyance.

  The upper end, which is the downstream side of the first airflow conveyance path 13, is connected to the lower end of the airflow dryer 15 that extends in the vertical direction. The airflow dryer 15 has a heat exchanger 16 in which a plurality of heat radiating plates are formed at predetermined intervals. The heat exchanger 16 in this embodiment is a plate-type heat exchanger 16 in which the heat radiating plate has a plate shape. And the to-be-dried material A is dried with the heat exchanger 16 by distribute | circulating the to-be-dried material A to rise among several plates. As a result, the dried material A to be dried becomes dried materials B1 and B2.

  One end of a second airflow conveyance path 14 made of a duct is connected to the upper end of the airflow dryer 15. The other end side of the second airflow conveyance path 14 is branched and connected to the circulation cyclone 17 and the discharge cyclone 18. Then, the moisture-adjusted dried product B1 that is a part of the dried products B1 and B2 dried by the airflow dryer 15 is introduced into the circulation cyclone 17 together with the conveying airflow C, while the dried products B1 and B2 are used. Among them, the processed dry matter B2 which is a part other than the moisture adjusting dry matter B1 is introduced into the discharge cyclone 18 together with the conveying airflow C.

  The discharge cyclone 18 is configured to separate the processed dry matter B2 from the transport airflow C. The separated dried product B2 that has been separated is carried out as a product, while the separated conveying airflow C is sucked into the circulation fan 19.

  The circulation cyclone 17 is disposed above the stirrer 12 and is configured to separate the moisture adjusting dried material B1 and the conveying airflow C. The separated dried product B1 for moisture adjustment is supplied to the lower agitator 12 via the dried product transporting duct 23 while the separated transporting airflow C is sucked into the circulation fan 19.

  The circulation fan 19 sucks the conveyance airflow C discharged from the circulation cyclone 17 and the discharge cyclone 18 and supplies a part thereof to the bag filter 25, while the remaining conveyance airflow C flows into the inflow space of the stirrer 12. 41 is configured to be supplied via the airflow conveyance duct 22.

  The conveying airflow C supplied to the bag filter 25 is supplied to the deodorizing furnace 28 through the condenser 26 and the fan 27. The gas deodorized in the deodorizing furnace 28 is supplied to the airflow dryer 15. A part of the airflow C for conveyance in the airflow dryer 15 is exhausted.

-Effect of the embodiment-
Conventionally, the airflow conveying duct 22 is connected to the vicinity of the supply port 12a, and the airflow is configured to be sent from the stirrer 12 discharge port 12b through the space above the stirrer 12. However, according to the present embodiment, the airflow for conveyance once flows into the inflow space 41 in the stirrer 12 and then flows out together with the material A to be dried beyond the weir plate 40 toward the discharge port 12b. The air current hardly touches the object A to be dried, and the object A is not dried unexpectedly.

  Furthermore, since the airflow conveying duct 22 has only to be connected to the back surface on the side of the inflow space, the length in the longitudinal direction is not increased compared to the case where it is provided in the longitudinal direction of the stirring shaft 21, and piping is easy and space is reduced. Can be reduced.

  Therefore, in this embodiment, since the stirring conveyance path in the stirrer 12 and the inflow space 41 communicating with the first airflow conveyance path 13 are separated by the weir plate 40, the airflow for conveyance is to be dried. It is prevented that the material to be dried A is dried more than necessary and adheres to the inner surface of the stirrer 12 without coming into contact with A.

(Other embodiments)
In the above embodiment, the airflow conveyance duct 22 is connected to the back surface of the stirrer 12, but is not limited thereto, and may be connected to the inflow space 41. For example, the upper surface near the discharge port 12b or the longitudinal end of the stirrer 12 may be used. In this case, since there is a possibility that the air current flows backward through the stirrer 12, the air current may be guided to the discharge port 12b with a baffle plate or the like.

  In addition, as shown in FIG. 3, a discharge port 112b may be provided below the inflow space 141, and the dried material A after stirring may be dropped into the discharge port 112b. In this case, the airflow conveyance duct 22 may be disposed at the lower part of the stirrer 12 and may join the discharge port 112b to convey the material A to be dried to the first airflow conveyance path 13. Since the transport airflow does not enter the inflow space 141, it is possible to prevent the transport airflow from entering the stirring transport path from the airflow transport duct 22 more than in the above embodiment.

  In the above embodiment, the weir plate 40 is disposed inside the stirrer 12. However, as shown in FIG. 4, the stirrer 212 in another embodiment, instead of the weir plate 40, a downstream stirrer casing. It is also possible to provide a discharge port 212b for the material to be dried and an inflow space 241 communicating with the discharge port 212b outside the stirrer 212. In the drawing, the inflow space 241 is formed in the airflow conveyance duct 22, but the inflow space 241 may be provided between the discharge port 212 b and the airflow conveyance duct 22.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use. The technical features described in each embodiment can be combined with each other, and a new technical feature can be formed by combining them.

  As described above, the present invention is useful for a drying apparatus that introduces a material from a stirrer to a heat exchanger by airflow conveyance.

A to be dried
B1 Dry matter for moisture adjustment
B2 Treated dry matter
C Hot gas
1 Drying equipment
11 Feeder
12 Stirrer
12a Supply port
12b outlet
13 First air flow path
14 Second air flow path
15 Airflow dryer
16 Heat exchanger
17 Circulating cyclone
18 Exhaust cyclone
19 Circulation fan
21 Stirring shaft
21a stirring blade
22 Duct for air current conveyance
23 Duct for transporting dry matter
25 Bug filter
26 Condenser
27 fans
28 Deodorizing furnace
40 dam plate
41 Inflow space 112b Outlet 141 Inflow space 212 Stirrer 212b Outlet 241 Inflow space

Claims (4)

An air current conveying path for air conveying an object to be dried;
A heat exchanger,
A stirrer provided with a stirring transport path for stirring and transporting the material to be dried supplied from the supply port by means of a stirring shaft while adjusting moisture;
A drying apparatus comprising an airflow dryer that transports the air to be dried stirred and transported by the stirrer through the airflow transport path and that is dried by the heat exchanger,
The stirring shaft extends horizontally,
Connected to an inflow space formed on the downstream side of the agitation transport path, and provided with an air current transport duct for feeding the material to be dried flowing into the inflow space from the discharge port of the agitator to the air current transport path ,
Provided with a dam plate that dams the material to be dried downstream of the agitation transport path,
The inflow space is formed further on the downstream side of the dam plate, and the to-be-dried material that has flowed into the inflow space beyond the dam plate is sent to the airflow conveyance path. apparatus. The drying apparatus according to claim 1 ,
The airflow conveying duct is connected to a side surface of the agitator on the side of the inflow space,
The discharge port is formed above the inflow space,
The drying apparatus, wherein the object to be dried is configured to be transported to the discharge port by a transport airflow that has flowed into the inflow space from the airflow transport duct. The drying apparatus according to claim 1 ,
The discharge port is formed below the inflow space in the stirrer,
The drying apparatus characterized in that the airflow conveying duct is connected to the discharge port and configured to carry the air to be dried which has fallen from the discharge port. An air current conveying path for air conveying an object to be dried;
A heat exchanger,
A stirrer provided with a stirring transport path for stirring and transporting the material to be dried supplied from the supply port by means of a stirring shaft while adjusting moisture;
A drying apparatus comprising an airflow dryer that transports the air to be dried stirred and transported by the stirrer through the airflow transport path and that is dried by the heat exchanger,
The stirring shaft extends horizontally,
Drying characterized by comprising an airflow conveying duct that is connected to an inflow space formed on the downstream side of the discharge port of the agitator and that feeds the material to be dried that has flowed into the inflow space into the airflow conveyance path. apparatus.

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