JP5379757B2 - Sludge molding nozzle and band-type sludge dryer - Google Patents

Description

  The present invention relates to a sludge molding nozzle used for molding sludge (especially sewage sludge) and a band-type sludge drying apparatus provided with the sludge molding nozzle.

  When the sludge is used effectively, first, a process of drying the sludge is performed (for example, see Patent Document 1).

  Therefore, for such a sludge drying process, it is conceivable to use a multi-stage band type drying apparatus used for drying marine products and the like. The multi-stage band type drying apparatus is described in Patent Document 2 and Patent Document 3, and the like, and is provided with a plurality of mesh conveyor belts (bands) for transporting dried products such as seafood in the vertical direction. The object to be dried is dried by blowing hot air or warm air to the object to be dried conveyed by the band.

  And as a method of supplying sludge to such a multistage band type drying apparatus, as described in Patent Document 4, a method of supplying sludge by extruding from a cylindrical porous nozzle, Patent Document 5 As described in the above, a method is considered in which sludge is formed into a string by supplying with a roller.

JP 2008-050458 A Japanese Patent Laid-Open No. 02-069135 Japanese Utility Model Publication No. 06-031479 JP 2007-306879 A JP 2008-020172 A

  Normally, sewage sludge (dehydrated cake) contains foreign substances such as hair and has high adhesion.

  Therefore, as in Patent Document 4, when sewage sludge is extruded from a cylindrical perforated nozzle, the hair in the sewage sludge straddles the nozzle hole, causing clogging, and continuous and stable supply cannot be performed.

  Also, as in Patent Document 5, when sludge is compacted by a roller, highly adherent sewage sludge adheres to the roller and does not separate from the roller under its own weight. As a countermeasure, it is conceivable to attach a scraper that matches the groove of the roller. However, the scraper becomes a lump on the scraper.

  The present invention has been made in view of the above circumstances, and a sludge molding nozzle capable of smoothly molding sludge (especially sewage sludge) and a band-type sludge drying apparatus provided with the sludge molding nozzle. Is intended to provide.

  In order to solve the above problems, the present invention has the following features.

  [1] In a sludge-molding cylindrical nozzle having a rectangular cross section, a pin for partitioning the rectangular cross section into a plurality of long sides of the rectangle is arranged, and a pin insertion / extraction means for inserting / removing the pin into / from the nozzle A nozzle for sludge molding characterized by being provided.

  [2] The above [1], wherein the pins are divided into units each having a plurality of pins connected thereto, and the pin insertion / removal means is capable of inserting / removing pins for each unit. The nozzle for sludge molding as described.

  [3] A band-type sludge drying apparatus comprising the sludge molding nozzle according to [1] or [2].

  In the present invention, sludge (especially sewage sludge) can be formed smoothly.

It is a figure which shows the band-type sludge drying apparatus in one Embodiment of this invention. It is a figure which shows the basic composition of the sludge shaping | molding nozzle in one Embodiment of this invention. It is a figure which shows the basic composition of the sludge shaping | molding nozzle in one Embodiment of this invention. It is a figure which shows the specific structure of the sludge shaping | molding nozzle in one Embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a multi-stage band sludge drying apparatus according to an embodiment of the present invention. As shown in FIG. 1, the multi-stage band sludge drying apparatus 10 in this embodiment includes a plurality of bands (here, the first-stage band 12 and the second-stage band 13) inside the drying apparatus main body 11. In addition, a molding nozzle (sludge molding) that forms the dewatered sludge 1 that has been supplied from the sludge storage tank 7 in which the dewatered sludge 1 is stored by the sludge pump (sludge transport pump) 8 into a predetermined shape. Nozzle) 14 and a dry sludge discharge device 15 for discharging the sludge after drying. The warm air is heat exchanged with unused exhaust heat or the like in the warm air generating heat exchanger 19 to a predetermined temperature, blown to the drying apparatus main body 11, and conveyed by the first-stage band 12 and the second-stage band 13. The sludge (molded sludge) 2 is dried. In that case, in order to dry while suppressing the odor from the sludge 2 as much as possible, a shell is formed on the surface of the sludge 2 with warm air of 170 to 240 ° C. Most of the hot air is circulated in the hot air generating heat exchanger 19 and the drying device main body 11 by the circulation fan 18, a part is introduced from the atmosphere by the air introduction fan 17, and a part is an exhaust treatment device (not shown). Exhausted by.

  In this embodiment, when the sludge 1 is dried by the multi-stage band drying device 10, the sludge 1 is formed into a rod shape by the sludge forming nozzle 14 and then placed on the first-stage band 12.

  2 and 3 are views showing a basic configuration of the sludge molding nozzle 14 in this embodiment. Here, FIG. 2 is an elevation view, and FIG. 3 is an AA arrow view in FIG.

  In FIG. 2, the sludge molding nozzle 14 is directed perpendicular to the first-stage band 12, and the molded sludge (molded sludge) 2 is placed on the first-stage band 12. The angle of the sludge molding nozzle 14 with respect to the first stage band 12 does not have to be vertical, and may be horizontal.

  As shown in FIGS. 2 and 3, the sludge molding nozzle 14 in this embodiment is a pin that partitions the rectangular cross section into a plurality of rectangular long sides in the sludge molding cylindrical nozzle 20 having a rectangular cross section. 21 is arranged, and an actuator (hydraulic cylinder or the like) 23 for inserting and removing these pins with respect to the sludge forming cylindrical nozzle 20 via the connecting plate 22 is provided.

  Here, FIG. 3A shows a state in which the pin 21 is inserted into the sludge molding cylindrical nozzle 20, and FIG. 3B shows a state in which the pin 21 is extracted from the sludge molding cylindrical nozzle 20. ing.

  As a result, normally, as shown in FIG. 3A, the pin 21 is inserted into the opposing wall (near the wall) of the sludge molding cylindrical nozzle 20 so that the sludge molding cylindrical nozzle 20 The sludge 1 flowing in a plate shape inside is cut and formed into a rod shape by a pin 21.

  When foreign matter such as hair in the sludge 1 is entangled so as to straddle the pin 21, the actuator 23 is operated to remove the pin 21 from the sludge molding cylindrical nozzle 20 as shown in FIG. Extract. Thereby, foreign matters such as hair entangled with the pin 21 are detached from the pin 21 and pushed out together with the sludge from the inside of the sludge forming cylindrical nozzle 20.

  Thereafter, the actuator 23 is operated, and the pin 21 is inserted into the sludge forming cylindrical nozzle 20 to return to the state shown in FIG.

  In addition, while the pin 21 is extracted from the sludge forming cylindrical nozzle 20, the sludge 1 is not formed into a rod shape, but this is because the foreign matter such as hair entangled with the pin 21 is only the thickness of the pin 21. Since it is a short time until it is washed away, the influence on the drying characteristics of the sludge 2 after molding is small.

  Further, the timing of inserting and removing the pin 21 may be set by a timer. For example, the pin 21 is inserted for about 1 hour to form the sludge 1 into a rod shape, and the pin 21 is removed for about 5 seconds to remove foreign matters such as hair. By repeating the above, stable sludge rod-like molding and continuous operation are possible.

  And the concrete structure of the above nozzle 14 for sludge shaping | molding is shown in FIG. FIG. 4A shows a state in which the pin 21 is inserted into the sludge molding cylindrical nozzle 20, and FIG. 4B shows a state in which the pin 21 is extracted from the sludge molding cylindrical nozzle 20. .

  As shown in FIGS. 4A and 4B, in the sludge molding nozzle 14, a plurality of (here, four) pins 21 are attached to the connecting plate 22 connected to each actuator 23. The unit is divided into units including one actuator 23, one connecting plate 22, and a plurality (four in this case) of pins 21. Thereby, as shown in FIG.4 (b), the insertion / extraction of the pin 21 is attained for every unit.

  Here, the preferable dimension and shape of this sludge molding nozzle 14 are shown below.

・ Turn nozzle 20 for sludge molding
Full length (length in the longitudinal direction) L: 30 to 100 mm
Width (length in the long side direction) W: about the width of the first stage band 12 (up to about 1 m)
Thickness (gap in the short side direction) T: 5 to 15 mm
・ Pin 21
Thickness: φ1-5mm
Number: 10-100 Interval P: 5-15mm
・ Connecting plate 22
Number of mounting pins 21: 2 to 20

  Thus, in this embodiment, sludge (especially sewage sludge) can be formed smoothly.

1 Dewatered sludge 2 Molded sludge 7 Sludge storage tank 8 Sludge pump (sludge transport pump)
10 Multi-stage band sludge dryer 11 Dryer main body 12 First stage band 13 Second stage band 14 Sludge molding nozzle (sludge molding nozzle)
DESCRIPTION OF SYMBOLS 15 Dry sludge discharge device 17 Air introduction fan 18 Circulation fan 19 Hot air generating heat exchanger 20 Sludge molding cylindrical nozzle 21 Pin 22 Connecting plate 23 Actuator

Claims (3)

  In the cylindrical nozzle for sludge molding having a rectangular cross section, a pin for partitioning the rectangular cross section into a plurality of rectangular long sides is disposed, and a pin inserting / removing means for inserting and extracting the pin from the nozzle is provided. A sludge molding nozzle characterized by   2. The sludge molding according to claim 1, wherein the pins are divided into units each having a plurality of pins connected thereto, and the pin insertion / removal means is capable of inserting / removing pins for each unit. Nozzle.   A band-type sludge drying apparatus comprising the sludge molding nozzle according to claim 1.

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