JP2018008251A - Method for preventing adhesion of article to be dried in band-type drier and band-type drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable preventing a viscous article such as dewatered sludge from adhering a conveyor belt by using burned ash or dried sludge during drying treatment of the viscous article such as the dewatered sludge.SOLUTION: In a band-type drier 2 for supplying a viscous article molded by a molding machine 15 onto an endless conveyor belt 21 with air permeability and circulatingly movement, and spraying warm wind from a warm wind supply means 16 to the viscous article on the conveyor belt 21 from an upper part or a lower part to another direction to dry the viscous article on the conveyor belt 21, burned ash 28 or dried sludge 1'' having a larger particle diameter than an opening dimension of the conveyer belt 21 is scattered on the conveyer belt 21 in advance and the molded viscous article is supplied onto the scattered burned ash 28 or dried sludge 1''.SELECTED DRAWING: Figure 2

Description

  The present invention has a moisture content and a highly dehydrated sludge formed in a desired shape by a molding machine (water content is about 80% (humidity standard)), air permeability that orbits viscous materials such as livestock dung and food residues. It is supplied onto an endless transport belt with a slag, and hot air of about 200 ° C. is blown from the hot air supply means to the viscous material such as dehydrated sludge on the transport belt from above or below to dehydrated sludge on the transport belt. In a band-type dryer that dries viscous materials such as dehydrated sludge to about 70% of the self-flammability limit (dehydrated sludge), etc., using incinerated ash or dried sludge during the drying treatment of viscous materials such as dehydrated sludge The present invention relates to a method for preventing adhesion of an object to be dried for a band-type dryer and a band-type dryer that can prevent the viscous material from adhering to a conveyor belt.

  In general, when effective use or commercialization of viscous materials such as sewage sludge (dehydrated sludge), livestock dung, food residues, etc., the moisture content of the viscous material is high, and thus the viscous material is dried.

  For example, when the viscous material is sewage sludge (dehydrated sludge), as shown in Patent Documents 1 to 5, sewage sludge (dehydrated sludge) is dried using a dryer such as a band-type dryer, and dried sludge. Is used as a solid fuel or as a raw material for aggregates.

  In Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-243124), a part of fly ash containing a desulfurizing agent and a surplus desulfurizing agent that has been circulated is mixed in a dehydrated cake, and these are dried by a dryer and then circulated. It is designed to be supplied to the fluidized bed furnace as fuel, reducing the amount of desulfurizing agent input, reducing the amount of ash generated, and improving the drying performance and reducing the amount of odor generated by circulating fly ash. It is something that can be done.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-066792) discloses that a kneaded body obtained by mixing and kneading incineration ash of sewage sludge and hydrous sludge before incineration is granulated by compression molding or extrusion molding, and the molded product. Is dried in a drying furnace and then fired in a firing furnace to obtain a granular aggregate, and the water-containing sludge is dehydrated sludge having a moisture content of 75 to 85% obtained by dehydrating sewage sludge. Alternatively, it is surplus sludge with a moisture content of 95%, and aggregates can be provided at low cost.

  Further, Patent Document 3 (Japanese Patent Publication No. 2011-511703) discloses a step 1 for drying dehydrated sludge to be a sludge drying carrier, and transferring the sludge drying carrier and drying dewatered sludge to a stirring and mixing device. , Step 2 for producing mixed sludge by stirring and mixing, step 3 for transferring the mixed sludge to a drying apparatus and drying, and step 4 for repeating the steps 2 and 3 in step 4. Part of the mixed sludge discharged from the equipment is taken out in an amount determined by the amount of sludge drying carrier required for drying, transferred to the drying equipment for drying, where it is dried and sludge dried. The remaining mixed sludge is the final finished product, and the efficiency of sludge drying is high, energy consumption is low, and drying can be shortened. It is intended.

  Furthermore, the said patent document 4 (Unexamined-Japanese-Patent No. 2013-217553) reduces the auxiliary fuel by drying a part of dewatered sludge burned with an incinerator with a dryer, and mixing the dried sludge into the dehydrated sludge. Alternatively, it is converted to mixed sludge that does not require auxiliary fuel and put into the incinerator. The dry sludge is maintained in a granular state (average particle size of 2 to 50 mm) and dispersed and mixed in dehydrated sludge. In addition to producing mixed sludge, the produced mixed sludge is pressure-fed to an incinerator in a sealed state to prevent odor leakage and save energy.

  Further, in Patent Document 5 (Japanese Patent Laid-Open No. 2015-145001), dehydrated sludge having a water content of 80 to 85% (wet basis) is put into the sludge dryer and dried with hot air to have a water content of 20 to 20%. 30% (humidity standard) dry sludge is mixed with dewatered sludge before the sludge dryer is added to this dry sludge, and moisture adjustment sludge with a desired moisture content (40-60% (humidity standard)) is inexpensive. It can be easily obtained.

The techniques disclosed in Patent Documents 1 to 5 described above are all incinerated ash or dried sludge mixed with dehydrated sludge and dried by a dryer, and then subjected to incineration or the like. In order to mix incinerated ash or dried sludge with dehydrated sludge having a moisture content, and to mix to a low moisture content that does not adhere, there is a problem that a large amount of incinerated ash or dried sludge must be mixed with dehydrated sludge.
In addition, when a large amount of incinerated ash is mixed, there is also a problem that the calorific value is lowered and combustion becomes difficult.

  By the way, a band-type dryer has been conventionally used as a dryer for drying mixed sludge and dewatered sludge (see, for example, Patent Document 6 and Patent Document 7).

  That is, although not shown in the drawing, the band-type dryer supplies dehydrated sludge formed in a rod shape by a molding nozzle (molding machine) onto an endless band (conveyor belt) having air permeability that moves around. The dehydrated sludge on the band is dried by blowing hot air from the warm air supply means on the dehydrated sludge.

  However, in the band dryer, there is a problem that the dried sludge transferred to the downstream end on the band has high adhesion, and thus is difficult to peel off from the band and causes the band to be blocked.

  In the band dryer, a scraper is provided at the downstream end of the band so as to wipe off the dry sludge adhering to the band, or before the sludge formed by the molding nozzle is placed on the band. The surface of the sludge is dried by blowing hot air from the nozzle, and the adhesion of the sludge to the band is reduced so that it can be easily detached from the band.

  However, the band-type dryer that is wiped off by the scraper may clog the dried sludge with the scraper and the band mesh may be clogged with the dried sludge, and the band blows warm air from the blowing nozzle. The type dryer has a problem that if the surface of the sludge is dried too much, the moisture inside the sludge is difficult to escape and the drying efficiency is lowered.

JP 2002-243124 A JP 2004-067492 A Special table 2011-511703 gazette JP 2013-217553 A JP2015-145001A Japanese Patent No. 5768690 Japanese Patent No. 5443205

  The present invention has been made in view of such problems, and its purpose is to use incinerated ash or dried sludge during the drying treatment of viscous materials such as dehydrated sludge, thereby allowing viscous materials such as dehydrated sludge. An object of the present invention is to provide a method for preventing adhesion of an object to be dried of a band type dryer and a band type dryer which can prevent the toner from adhering to a conveyor belt.

  In order to achieve the above object, the method for preventing adhesion of an object to be dried of a band-type dryer according to the present invention supplies a viscous material molded by a molding machine onto an airless endless conveying belt that moves around. In a band-type dryer in which hot air is blown from above or below to the viscous material on the conveyor belt in the other direction to dry the viscous material on the conveyor belt, the conveyor belt is previously placed on the conveyor belt. It is characterized in that incinerated ash or dried sludge having a particle size larger than the opening size of the above is scattered, and a viscous material formed on the incinerated ash or dried sludge that has been scattered is supplied.

  It is preferable that the incinerated ash or dried sludge supplied on the conveyor belt is flattened and uniformly dispersed on the conveyor belt, and the viscous material is supplied onto the uniformly incinerated ash or dried sludge.

  The band-type dryer according to the present invention supplies the viscous material formed by the molding machine onto an air-permeable endless conveying belt that moves around, and warm air is supplied from the hot air supply means to the viscous material on the conveying belt. In a band-type dryer in which the viscous material on the conveyor belt is sprayed in the other direction from above or below, incineration ash or dried sludge having a particle size larger than the opening size of the conveyor belt is applied on the conveyor belt. It is characterized in that it is provided with a granular material supply means to be supplied and a leveling means for leveling the incinerated ash or dried sludge supplied on the conveyor belt evenly and evenly.

  The method for preventing adhesion of an object to be dried of a band-type dryer according to the present invention is a method in which incinerated ash or dried sludge having a particle size larger than the opening size of the conveying belt is pre-spread on the conveying belt, Since the viscous material molded in is supplied, it is possible to prevent the highly adherent viscous material from directly adhering to the conveyor belt during the drying process of the viscous material, and the viscous material dried by warm air. Can be easily and easily peeled off from the conveyor belt by incineration ash or dry sludge, and a predetermined dry viscosity can be obtained.

  In addition, the method for preventing adhesion of an object to be dried of the band-type dryer according to the present invention is the incineration in which the incineration ash or the dried sludge supplied on the conveyor belt is evenly dispersed on the conveyor belt and uniformly dispersed on the conveyor belt. Since the viscous material is supplied onto the ash or the dried sludge, it is possible to more reliably prevent the highly viscous material from adhering to the conveyor belt during the drying process of the viscous material, It becomes easy to pass through the conveyor belt uniformly, and the drying efficiency is improved.

  Furthermore, the band type dryer according to the present invention includes a granular material supply means for supplying incineration ash or dried sludge having a particle size larger than the opening size of the transport belt onto the transport belt, and incineration ash supplied on the transport belt. Or it is equipped with a leveling means that evenly and uniformly spreads the dried sludge, so that the incinerated ash or dried sludge can be evenly scattered on the conveyor belt, and highly adherent viscous substances are conveyed to the conveyor belt. Can be reliably and well prevented.

It is a block diagram which shows an example of the sludge incineration processing equipment provided with the band type dryer which enforces the method of this invention. It is a schematic explanatory drawing of the band type dryer which concerns on this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of a sludge incineration treatment facility equipped with a band-type dryer for carrying out the method of the present invention. The sludge incineration treatment facility dries dehydrated sludge 1 into a solid fuel (dried sludge 1 ″). The solid fuel is incinerated, and the band-type dryer 2 that dries the dewatered sludge 1 to form solid fuel (dried sludge 1 ″) and the dried sludge 1 ″ that is solid fuel incinerated. Is provided in the sludge incinerator 3 and the gas discharge path 5, and the combustion exhaust gas 4 heats the combustion air 7 to the sludge incinerator 3 and also heats the drying air 7 ′ supplied to the band-type dryer 2. Heat exchanger 8 for warm air, drying air circulation path 9 for circulating drying air 7 ′ between band dryer 2 and heat exchanger 8, and heat exchange with band dryer 2 A circulation fan 10 interposed in a drying air circulation path 9 between the container 8 and A condenser 11 for dehumidifying moisture contained in the drying air 7 ′ and an exhaust gas treatment of the combustion exhaust gas 4. The condenser 11 is provided in a drying air circulation path 9 between the air dryer 2 and the circulation fan 10. And an exhaust gas treatment device 12 for producing clean gas.

  FIG. 2 shows a band-type dryer 2 according to an embodiment of the present invention. The band-type dryer 2 encloses a conveyor 13 that transports the dewatered sludge 1 in the horizontal direction and a part or all of the conveyor 13 for drying. The casing 14 forming the chamber, the dewatered sludge 1 is molded into a desired shape to form a molded sludge 1 ′, and this molded sludge 1 ′ is supplied onto the conveyor 13, and supplied to the drying chamber of the casing 14. The drying air 7 ′ is heated to about 200 ° C. to produce hot air, and the hot air is supplied to the formed sludge 1 ′ on the conveyor 13 and the granular incineration ash 28 is supplied onto the conveyor 13. And a leveling means 18 for leveling and uniformly dispersing the granular incinerated ash 28 supplied onto the conveyor 13.

The conveyor 13 includes a driving sprocket 19 and a driven sprocket 20 disposed in a horizontal position at a certain distance, an endless conveying belt 21 having air permeability wound around the sprockets 19 and 20, and a drive. A drive motor (not shown) for rotating the sprocket 19 is provided, and hot air is made to flow around the formed sludge 1 ′ on the conveyor belt 21 through the mesh and through holes of the conveyor belt 21. .
In addition, the conventionally well-known wire conveyor belt which has heat resistance and a softness | flexibility is used for the conveyance belt 21 of the conveyor 13. FIG.

  The casing 14 is disposed so as to surround a portion (an intermediate portion and a downstream portion of the conveyor 13) excluding an upstream portion (left portion in FIG. 2) of the conveyor 13 to form a drying chamber. An air outlet 14a for extracting the drying air 7 'is discharged at the upper part of 14 and the dried formed sludge 1' (hereinafter referred to as dry sludge 1 ") and incineration ash 28 are discharged at the lower part of the casing 14. A discharge port 14b is formed.

  The molding machine 15 is disposed above the upstream portion of the conveyor 13 and close to the casing 14 so that the molding sludge 1 ′ can be supplied to a portion of the conveyor belt 21 located in the casing 14. It has become.

  That is, the molding machine 15 includes a high-pressure vessel 22 having a molding chamber, a charging hopper 23 provided on the upper surface of the high-pressure vessel 22, a screw shaft 24 having screw blades 24a rotatably disposed in the high-pressure vessel 22, The screw extrusion type molding machine 15 includes a motor 25 that rotationally drives the screw shaft 24 and a die 26 that has a molding hole disposed at the tip of the high-pressure vessel 22.

  According to this molding machine 15, the dewatered sludge 1 introduced into the molding chamber from the input hopper 23 is conveyed to the die 26 side by the rotationally driven screw shaft 24 and is pressed into the molding hole of the die 26 while being compressed. It is extruded from the 26 forming holes and formed into a rod shape.

  In this embodiment, the molding machine 15 is configured such that the dewatered sludge 1 can be formed into a rectangular bar shape having a cross-sectional shape of about 1 cm on a side, and a plurality of rod-shaped sludges 1 'can be formed simultaneously.

  The hot air supply means 16 is heated by the heat exchanger 8 that heats the drying air 7 ′ by using heat such as sludge incineration exhaust heat (combustion exhaust gas 4) and the like, and heat heat 8. The drying air circulation path 9 for circulating the drying air 7 ′ between the casing 14 and the heat exchanger 8 of the band dryer 2, and the drying air circulation path between the casing 14 and the heat exchanger 8 9 and a condenser 11 that is interposed in a drying air circulation path 9 between the casing 14 and the circulation fan 10 and dehumidifies moisture contained in the drying air 7 ′. The drying air 7 is provided in the lower position of the conveyor belt 21 on the upper side of the conveyor 13 along the longitudinal direction and the width direction of the conveyor belt 21 and becomes warm air in the formed sludge 1 ′ on the conveyor belt 21. It is equipped with hot air outlet 27 that blows ′, reducing the amount of heat And so as to circulate the drying air 7 'for.

  In this embodiment, the hot air supply means 16 can heat the drying air 7 ′ to about 200 ° C. to generate hot air, and supply this hot air into the casing 14 (drying chamber) of the band-type dryer 2. I have to.

  The reason why the drying air 7 'is heated to about 200 ° C is that if the drying air 7' is heated to, for example, 300 ° C or more, it is easily gasified and ignited when the moisture content of the sewage sludge is low. is there. Here, hot air refers to drying air 7 ′ heated to 300 ° C. or higher, and hot air refers to drying air 7 ′ heated to approximately 200 ° C.

  The granular material supply means 17 supplies incinerated ash 28 having a particle size larger than the opening size (mesh or through-hole size) of the conveyor belt 21 to the upper surface on the upstream side of the conveyor belt 21 of the conveyor 13. , A crusher 29 for crushing the incinerated ash 28 obtained by incinerating the dried sludge 1 ″, and a particle size selector having a sieve for screening the incinerated ash 28 crushed by the crusher 29 according to the particle size 30 and an ash supply hopper 31 for storing the screened incineration ash 28 and supplying it to the upper surface on the upstream side of the conveyor belt 21 of the conveyor 13.

  In this embodiment, the granular material supply means 17 is configured to select and supply the incineration ash 28 having a particle diameter of 1 mm to 10 mm onto the conveyor belt 21.

  The leveling means 18 equalizes the incinerated ash 28 supplied onto the conveyor belt 21 by the granular material supply means 17 and distributes it uniformly on the conveyor belt 21, and is provided downstream of the ash supply hopper 31. A plate-like leveling member 18 a is provided at the side position so that the height can be adjusted, and has substantially the same dimensions as the width of the conveyor belt 21.

  According to the leveling means 18, the ash supply hopper 31 is adjusted by adjusting the distance between the lower end of the leveling member 18 a and the upper surface of the conveyor belt 21 so that the incinerated ash 28 having a particle diameter of 1 mm to 10 mm can pass through. Thus, the incineration ash 28 supplied onto the conveyor belt 21 is leveled to the leveling member 18 a and is uniformly scattered on the conveyor belt 21.

  In the above embodiment, the intermediate portion and the downstream portion of the conveyor 13 are surrounded by the casing 14. However, in another embodiment, the entire conveyor 13 may be surrounded by the casing 14.

  Further, in the above embodiment, warm air (drying air 7 ′ of about 200 ° C.) is blown upward from the bottom to the formed sludge 1 ′ on the conveyor belt 21 of the conveyor 13. In the embodiment, warm air may be blown from the upper side to the lower side of the formed sludge 1 ′ on the conveyor belt 21.

  Further, in the above embodiment, the leveling means 18 is formed by the plate-shaped leveling member 18a. However, in other embodiments, the leveling means 18 is rotatable along the width direction of the conveyor belt 21. You may form with the arrange | positioned leveling roll (illustration omitted).

  Next, the case where the dewatered sludge 1 is dried using the band dryer 2 having the above-described configuration will be described.

  The incinerated ash 28 discharged from the sludge incinerator 3 that incinerates the dried sludge 1 ″ converted into solid fuel is crushed by a crusher 29, and then incinerated ash having a particle size of 1 mm to 10 mm by a particle size sorter 30. 28 and incinerated ash 28 having a particle diameter of 10 mm or more At this time, the incinerated ash 28 having a particle diameter of 1 mm to 10 mm is supplied to an ash supply hopper 31 and incinerated with a particle diameter of 10 mm or more. The ash 28 is discharged out of the system.

  The incinerated ash 28 having a particle size of 1 mm to 10 mm supplied into the ash supply hopper 31 is sequentially transferred from the ash supply hopper 31 to the upper surface on the upstream side of the transfer belt 21 before the formed sludge 1 ′ is supplied onto the transfer belt 21. Supplied. At this time, the incinerated ash 28 is formed to have a particle size larger than the opening size of the conveyor belt 21, and therefore does not fall from the mesh of the conveyor belt 21.

  The incinerated ash 28 supplied to the upper surface on the upstream side of the transport belt 21 is leveled by the leveling member 18 a located on the downstream side of the ash supply hopper 31 and is uniformly scattered on the transport belt 21. At this time, the incineration ash 28 is scattered so that warm air (drying air 7 ′ at about 200 ° C.) can pass through the transport belt 21 satisfactorily.

  On the other hand, the dewatered sludge 1 obtained by dewatering the sewage sludge has a water content of about 80% (humidity standard), and is put into a molding machine 15 to be formed into a plurality of rods and conveyed in advance. It is supplied onto the incineration ash 28 that is uniformly scattered on the upper surface of the belt 21. Therefore, it is possible to prevent the formed sludge 1 ′ having high adhesion and high water content from directly adhering to the conveyor belt 21. At this time, the supply speed of the formed sludge 1 ′ and the transfer speed of the conveyor belt 21 are set to the same speed, so that the formed sludge 1 ′ can be prevented from stagnation and overlapping or torn. .

  The formed sludge 1 ′ supplied to the conveyor belt 21 is warm air (drying air of about 200 ° C.) blown upward from the warm air outlet 27 while being conveyed in the casing 14 (drying chamber) by the conveyor belt 21. 7 ′) is dried to become dry sludge 1 ″. At this time, since the formed sludge 1 ′ is formed in a bar shape having a rectangular cross section, a surface area in contact with the hot air is secured. Further, the surface of the formed sludge 1 'is dried and solidified so that the shape can be maintained, and dust generation and odor are suppressed.

  Molded sludge 1 'dried with warm air (drying air 7' at about 200 ° C) becomes dry sludge 1 "having a moisture content of about 70% (wet basis). Because of its strong nature, if it is in direct contact with the conveyor belt 21, it will not adhere to the surface of the conveyor belt 21 and will not peel off even if the conveyor belt 21 passes the turning point.

  However, in the band type dryer 2, the incineration ash 28 having a particle size larger than the opening size of the conveyance belt 21 is uniformly dispersed in advance on the conveyance belt 21, and the formed sludge 1 ′ is deposited on the incineration ash 28 that has been dispersed. Therefore, it is possible to prevent the formed sludge 1 ′ having high adhesion from directly adhering to the conveyor belt 21, and the dried sludge 1 ″ obtained by hot air drying is incinerated ash 28. Thus, it is easily and easily peeled off from the conveyor belt 21, and is dropped and discharged from the discharge port 14b.

  The drying air 7 ′ containing moisture evaporated by drying the dewatered sludge 1 is extracted from the air outlet 14 a, dehumidified by the condenser 11, and then reheated by the heat exchanger 8 to be within the casing 14. And recycled as a heat source for drying.

  In the above embodiment, the incineration ash 28 is scattered on the transport belt 21. In other embodiments, the dried sludge 1 ″ is scattered on the transport belt 21 instead of the incineration ash 28. When dry sludge 1 ″ is used, the moisture content is about 40%, which reduces the thickness of the formed sludge 1 ′ placed on the upper surface of the conveyor belt 21 and slows the transfer speed of the conveyor belt 21 to eliminate adhesion. (Moisture standard) Drying is performed to the following to produce dried sludge 1 ″. This dried sludge 1 ″ is used in place of the incinerated ash 28. When making dry sludge 1 ″, it is not possible to produce dry sludge 1 ″ with a moisture content of about 70% (wet basis), which is not very efficient. Can be used.

  Thus, in the band dryer 2 described above, the incinerated ash 28 or the dry sludge 1 ″ having a moisture content of about 40% (wet basis) or less under the dewatered sludge 1 supplied to the upper surface of the conveyor belt 21. Therefore, even dry dry sludge 1 ″ having a high moisture content of about 70% (wet basis) can be reliably and easily peeled off from the conveyor belt 21 and dried at a predetermined moisture content. Sludge 1 ″ can be obtained.

  Moreover, in said embodiment, although the dehydrated sludge 1 was dried using the band-type dryer 2, in addition to the dehydrated sludge 1, livestock excrement, food residue, fertilizer, etc. with high moisture content and adhesion May be dried.

  Furthermore, in the above-described embodiment, the drying air 7 'is heated to 200 ° C, but the temperature of the drying air 7' is not limited to the above temperature. When drying an object to be dried such as a residue or fertilizer, it may be 200 ° C. or higher or 200 ° C. or lower.

  1 is dewatered sludge, 1 ′ is molded sludge, 1 ″ is dried sludge, 2 is a band dryer, 3 is a sludge incinerator, 4 is combustion exhaust gas, 5 is a gas discharge route, 7 is combustion air, and 7 ′ is Drying air, 8 is a heat exchanger, 9 is a drying air circulation path, 10 is a circulation fan, 11 is a condenser, 12 is an exhaust gas treatment device, 13 is a conveyor, 14 is a casing, 14a is an air outlet, 14b Is a discharge port, 15 is a molding machine, 16 is hot air supply means, 17 is particulate supply means, 18 is leveling means, 18a is a leveling member, 19 is a drive sprocket, 20 is a driven sprocket, 21 is a conveyor belt, 22 is a high pressure vessel, 23 is a charging hopper, 24 is a screw shaft, 24a is a screw blade, 25 is a motor, 26 is a die, 27 is a hot air outlet, 28 is incineration ash, 29 is a crusher, 30 is a particle size sorter Machine 31 is an ash supply hopper.

Claims (3)

  Viscous material formed by a molding machine is supplied onto a breathable endless conveyor belt, and hot air is blown from above or below to the viscous material on the conveyor belt in the other direction. In a band dryer that dries the viscous material on the belt, incineration ash or dry sludge having a particle size larger than the opening size of the transport belt is previously scattered on the transport belt, and the incinerated ash or dry sludge that is sprinkled A method for preventing adherence of an object to be dried in a band-type dryer, characterized in that a viscous material molded above is supplied.   The incinerated ash or dried sludge supplied on the conveyor belt is leveled and uniformly dispersed on the conveyor belt, and the viscous material is supplied onto the uniformly incinerated ash or dried sludge. The method for preventing adhesion of an object to be dried of a band drier according to claim 1.   Viscous material formed by a molding machine is supplied onto a breathable endless conveyor belt, and hot air is blown from above or below to the viscous material on the conveyor belt in the other direction. In the band dryer for drying the viscous material on the belt, a granular material supply means for supplying incinerated ash or dried sludge having a particle size larger than the opening size of the conveyor belt onto the conveyor belt, and a conveyor belt A band-type dryer characterized by being equipped with leveling means for leveling the incinerated ash or dried sludge supplied above into a flat shape and dispersing it uniformly.

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