JP6635464B2 - Method for preventing adhesion of material to be dried in band type dryer and band type dryer - Google Patents

Method for preventing adhesion of material to be dried in band type dryer and band type dryer Download PDF

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JP6635464B2
JP6635464B2 JP2016140671A JP2016140671A JP6635464B2 JP 6635464 B2 JP6635464 B2 JP 6635464B2 JP 2016140671 A JP2016140671 A JP 2016140671A JP 2016140671 A JP2016140671 A JP 2016140671A JP 6635464 B2 JP6635464 B2 JP 6635464B2
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吉井 隆裕
隆裕 吉井
大祐 鮎川
大祐 鮎川
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Takuma KK
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Description

本発明は、成形機により所望の形状に形成した含水率及び付着性が高い脱水汚泥(含水率が約80%(湿量基準))や畜糞、食品残渣等の粘性物を周回移動する通気性のある無端状の搬送ベルト上に供給し、搬送ベルト上の脱水汚泥等の粘性物に温風供給手段から約200℃の温風を上方又は下方から他方向へ吹き付け、搬送ベルト上の脱水汚泥等の粘性物を自燃限界の約70%(湿量基準)まで乾燥させるようにしたバンド式乾燥機において、脱水汚泥等の粘性物の乾燥処理時に焼却灰又は乾燥汚泥を利用して脱水汚泥等の粘性物が搬送ベルトに付着するのを防止できるようにしたバンド式乾燥機の被乾燥物付着防止方法及びバンド式乾燥機に関するものである。   The present invention relates to an air-permeable material that moves around a viscous substance such as dehydrated sludge (having a moisture content of about 80% (based on wet weight)), animal dung, and food residue, which is formed into a desired shape by a molding machine and has high moisture content and high adhesion. On the endless conveyor belt with air, and blow hot air of about 200 ° C. from above or below from the hot air supply means to the viscous material such as dehydrated sludge on the conveyor belt from above or below, and dehydrated sludge on the conveyor belt And other viscous materials are dried to about 70% of the self-combustion limit (wet weight basis). The present invention relates to a band-type dryer and a method for preventing the adherence of a viscous material to a conveyor belt.

一般に、下水汚泥(脱水汚泥)、畜糞、食品残渣等の粘性物の有効利用や製品化等を図る場合、粘性物の含水率が高いので、粘性物を乾燥処理することが行われている。   In general, when the viscous substance such as sewage sludge (dewatered sludge), livestock dung, food residue, etc. is to be effectively used or commercialized, the viscous substance is dried because the viscous substance has a high moisture content.

例えば、粘性物が下水汚泥(脱水汚泥)の場合には、特許文献1〜5に示す如く、バンド式乾燥機等の乾燥機を用いて下水汚泥(脱水汚泥)を乾燥処理し、乾燥した汚泥を固形燃料として使用したり、骨材の原料として使用したりしている。   For example, when the viscous material is sewage sludge (dewatered sludge), as shown in Patent Literatures 1 to 5, sewage sludge (dewatered sludge) is dried using a dryer such as a band type drier, and dried sludge. Is used as a solid fuel or as a raw material for aggregate.

前記特許文献1(特開2002−243124号公報)は、脱水ケーキに脱硫剤と循環させた脱硫剤余剰分を含む一部の飛灰を混合し、これらを乾燥機により乾燥させた後、循環流動層炉に燃料として供給するようにしたものであり、脱硫剤投入量を低減できると共に、灰発生量も低減でき、しかも、循環させた飛灰により乾燥性能の向上や臭気の発生量を低減できるようにしたものである。   JP-A-2002-243124 discloses that a dewatered cake is mixed with a desulfurizing agent and a part of fly ash containing a surplus desulfurizing agent circulated, dried by a dryer, and then circulated. It is designed to be supplied as fuel to the fluidized bed furnace, which can reduce the amount of desulfurizing agent used, reduce the amount of ash generated, and improve the drying performance and reduce the amount of odor generated by circulating fly ash It is made possible.

また、前記特許文献2(特開2004−067492号公報)は、下水汚泥の焼却灰と焼却前の含水汚泥とを混合混練した混練体を圧縮成型又は押出し成型により造粒成型し、当該成型物を乾燥炉で乾燥した後、焼成炉で焼成して粒状骨材を得るようにしたものであり、前記含水汚泥が、下水汚泥を脱水処理して得られた水分が75〜85%の脱水汚泥又は含水率が95%の余剰汚泥であり、骨材を安価に提供できるようにしたものである。   Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-067492) discloses that a kneaded body obtained by mixing and kneading incinerated ash of sewage sludge and hydrous sludge before incineration is granulated and formed by compression molding or extrusion molding, and the molded product is formed. Is dried in a drying furnace and then fired in a firing furnace to obtain granular aggregates, wherein the hydrous sludge has a water content of 75 to 85% obtained by dewatering sewage sludge. Alternatively, it is surplus sludge having a water content of 95%, and the aggregate can be provided at low cost.

更に、前記特許文献3(特表2011−511703号公報)は、脱水した汚泥を乾燥して汚泥乾燥用担体とするステップ1と、汚泥乾燥用担体と乾燥する脱水汚泥を攪拌混合装置に移送し、攪拌混合を行って混合汚泥を作るステップ2と、混合汚泥を乾燥装置に移送して乾燥するステップ3と、前記ステップ2及びステップ3を繰り返すステップ4とを含み、前記ステップ4において、攪拌混合装置から排出した混合汚泥の一部は、乾燥のために必要とする汚泥乾燥用担体の量によって決められる量が取り出され、乾燥のために乾燥装置に移送されてここで乾燥を行って汚泥乾燥用担体とし、残余部分の混合汚泥は、最終の完成品とするようにしたものであり、汚泥乾燥の効率が高くてエネルギーの消費が低く、乾燥を短くできるようにしたものである。   Further, Patent Document 3 (Japanese Unexamined Patent Publication No. 2011-511703) discloses a step 1 in which dehydrated sludge is dried to be a sludge drying carrier, and the sludge drying carrier and the dehydrated sludge to be dried are transferred to a stirring and mixing device. Step 2 of making mixed sludge by performing stirring and mixing, Step 3 of transferring the mixed sludge to a drying device and drying, and Step 4 of repeating Steps 2 and 3 above. Part of the mixed sludge discharged from the device is taken out in an amount determined by the amount of the sludge drying carrier required for drying, transferred to a drying device for drying, and dried there to perform sludge drying. The remaining mixed sludge is used as the final finished product.The sludge drying efficiency is high, energy consumption is low, and drying can be shortened. It is intended.

更に、前記特許文献4(特開2013−217553号公報)は、焼却炉で燃焼させる脱水汚泥の一部を乾燥機により乾燥させ、乾燥させた乾燥汚泥を脱水汚泥に混合させて補助燃料を低減若しくは補助燃料を必要としない混合汚泥に変換して焼却炉に投入するようにしたものであり、乾燥汚泥の粒状状態(平均粒径が2〜50mm)を維持させて脱水汚泥に分散混合して混合汚泥を生成すると共に、生成された混合汚泥を密閉状態で焼却炉に圧送するようにしたものであり、臭気漏洩防止と省エネルギー化を図るようにしたものである。   Further, Patent Document 4 (Japanese Patent Application Laid-Open No. 2013-217553) discloses that a part of dewatered sludge to be burned in an incinerator is dried by a dryer, and the dried dry sludge is mixed with the dewatered sludge to reduce auxiliary fuel. Alternatively, the sludge is converted into a mixed sludge that does not require an auxiliary fuel and is then introduced into an incinerator. The granular state of the dried sludge (average particle size is 2 to 50 mm) is maintained and dispersed and mixed with the dewatered sludge. The mixed sludge is generated, and the generated mixed sludge is pressure-fed to an incinerator in a sealed state to prevent odor leakage and save energy.

更に、前記特許文献5(特開2015−145001号公報)は、汚泥乾燥機内に投入された含水率が80〜85%(湿量基準)の脱水汚泥を熱風により乾燥して含水率が20〜30%(湿量基準)の乾燥汚泥とし、この乾燥汚泥に汚泥乾燥機投入前の脱水汚泥を混合して所望の含水率(40〜60%(湿量基準))の水分調整汚泥が安価に且つ容易に得られるようにしたものである。   Further, Patent Document 5 (Japanese Patent Application Laid-Open No. 2015-145001) discloses that a dewatered sludge having a water content of 80 to 85% (wet amount basis) charged into a sludge dryer is dried with hot air to have a water content of 20 to 85%. 30% (wet amount basis) dry sludge is mixed with dewatered sludge before the sludge dryer is introduced into the dried sludge to obtain a moisture-controlled sludge having a desired moisture content (40 to 60% (wet amount basis)) at a low cost. And it is intended to be easily obtained.

上述した特許文献1〜5に開示された技術は、何れも焼却灰又は乾燥汚泥を脱水汚泥と混合して乾燥機により乾燥処理した後、焼却処理等を行うようにしたものであるが、高含水率の脱水汚泥に焼却灰又は乾燥汚泥を混合し、付着しない低含水率まで混合するためには、多量の焼却灰や乾燥汚泥を脱水汚泥に混合しなければならないと言う問題がある。
また、多量の焼却灰を混合すると、発熱量が低下し、燃焼し難くなると言う問題もある。
The techniques disclosed in Patent Documents 1 to 5 described above are all designed to mix incinerated ash or dry sludge with dehydrated sludge, dry the mixture with a dryer, and then perform incineration treatment or the like. In order to mix incinerated ash or dry sludge with dehydrated sludge having a water content and 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.
Further, when a large amount of incinerated ash is mixed, there is a problem that the calorific value is reduced and it becomes difficult to burn.

ところで、従来から混合汚泥や脱水汚泥を乾燥処理する乾燥機には、バンド式乾燥機が使用されている(例えば、特許文献6及び特許文献7参照)。   By the way, a band type dryer is conventionally used as a dryer for drying mixed sludge and dewatered sludge (see, for example, Patent Documents 6 and 7).

即ち、前記バンド式乾燥機は、図示していないが、成形ノズル(成形機)により棒状に形成した脱水汚泥を周回移動する通気性を有する無端状のバンド(搬送ベルト)上に供給し、バンド上の脱水汚泥に温風供給手段から温風を吹き付け、バンド上の脱水汚泥を乾燥処理するようにしたものである。   That is, although not shown, the band-type dryer supplies a dehydrated sludge formed in a rod shape by a molding nozzle (molding machine) onto a permeable endless band (conveying belt) that moves around the band. Warm air is blown from the hot air supply means to the upper dewatered sludge to dry the dewatered sludge on the band.

しかし、前記バンド式乾燥機においては、バンド上の下流側端部に移送された乾燥汚泥は、付着性が高いため、バンドから剥離し難く、バンドの閉塞を引き起こすと言う問題があった。   However, in the above-mentioned band type dryer, there is a problem that the dried sludge transferred to the downstream end portion on the band has a high adhesiveness, so that it is difficult to peel off from the band and causes the band to be blocked.

尚、前記バンド式乾燥機においては、バンドの下流側端部にスクレーパを設けてバンドに付着している乾燥汚泥を払い落とすようにしたり、或いは、成形ノズルにより形成された汚泥がバンドに載る前に吹き付けノズルから温風を吹き付けて汚泥の表面を乾燥させ、汚泥のバンドへの付着力を小さくしてバンドから離脱し易いように工夫されている。   In the band type dryer, a scraper is provided at the downstream end of the band to remove dry sludge adhering to the band, or before the sludge formed by the forming nozzle is put on the band. The surface of the sludge is dried by blowing warm air from a spray nozzle to reduce the adhesive force of the sludge to the band so that the sludge can be easily separated from the band.

しかしながら、スクレーパで払い落とすバンド式乾燥機は、乾燥汚泥がスクレーパで押し潰されてバンドの網目が乾燥汚泥で埋まって目詰まりを起こしたりすることがあり、また、吹き付けノズルから温風を吹き付けるバンド式乾燥機は、汚泥の表面が乾燥し過ぎると、汚泥内部の水分が抜け難くなり、乾燥効率が落ちると言う問題があった。   However, a band type dryer that wipes off with a scraper may cause clogging due to the dry sludge being crushed by the scraper and the mesh of the band being buried with the dry sludge, and a band blowing hot air from a blowing nozzle. The type dryer has a problem that if the surface of the sludge is excessively dried, the water inside the sludge is difficult to escape, and the drying efficiency is reduced.

特開2002−243124号公報JP-A-2002-243124 特開2004−067492号公報JP-A-2004-067492 特表2011−511703号公報JP 2011-511703 A 特開2013−217553号公報JP 2013-217553 A 特開2015−145001号公報JP, 2015-145001, A 特許第5768690号公報Japanese Patent No. 5768690 特許第5443205号公報Japanese Patent No. 5443205

本発明は、このような問題点に鑑みて為されたものであり、その目的は、脱水汚泥等の粘性物の乾燥処理時に焼却灰又は乾燥汚泥を利用することによって、脱水汚泥等の粘性物が搬送ベルトに付着するのを防止できるようにしたバンド式乾燥機の被乾燥物付着防止方法及びバンド式乾燥機を提供することにある。   The present invention has been made in view of such a problem, and an object of the present invention is to utilize incinerated ash or dried sludge during drying treatment of a viscous substance such as dehydrated sludge, thereby making it possible to use a viscous substance such as dehydrated sludge. It is an object of the present invention to provide a method for preventing a substance to be dried from adhering to a band-type drier and a band-type drier, which can prevent the adhering to a conveyor belt.

上記目的を達成するために、本発明に係るバンド式乾燥機の被乾燥物付着防止方法は、成形機により断面形状が矩形の棒状に成形した粘性物を周回移動する通気性のある無端状の搬送ベルト上に供給し、搬送ベルト上の粘性物に温風供給手段から温風を上方又は下方から他方向へ吹き付けて搬送ベルト上の粘性物を乾燥させるようにしたバンド式乾燥機において、前記粘性物の供給速度と搬送ベルトの搬送速度を同じ速度に設定し、前記搬送ベルト上に予め搬送ベルトの目開き寸法よりも大きい粒径の焼却灰又は乾燥汚泥を供給し、前記搬送ベルト上に供給した焼却灰又は乾燥汚泥を高さ調整自在な板状の均し部材により平面状に均して搬送ベルト上に均一に散りばめ、均一に散りばめた焼却灰又は乾燥汚泥上に断面形状が矩形の棒状に成形した粘性物を供給するようにしたことに特徴がある。 In order to achieve the above object, a method for preventing adhesion of an object to be dried of a band-type dryer according to the present invention includes an endless, air-permeable material that moves around a viscous material having a rectangular cross section formed by a molding machine. A band-type dryer that supplies the mixture onto the conveyor belt and blows the viscous material on the conveyor belt from above or below in a different direction with hot air from a hot air supply unit to the viscous object on the conveyor belt to dry the viscous object on the conveyor belt; The supply speed of the viscous material and the conveyance speed of the conveyance belt are set to the same speed, and incineration ash or dry sludge having a particle size larger than the opening size of the conveyance belt is supplied onto the conveyance belt in advance, and the conveyance belt is fed onto the conveyance belt. The supplied incinerated ash or dried sludge is leveled by a plate-shaped leveling member with an adjustable height and spread evenly on the conveyor belt.The cross-sectional shape of the uniformly spread incinerated ash or dried sludge is rectangular. Molded into a rod Viscous product is characterized in that so as to supply.

本発明に係るバンド式乾燥機は、成形機により断面形状が矩形の棒状に成形した粘性物を周回移動する通気性のある無端状の搬送ベルト上に供給し、搬送ベルト上の粘性物に温風供給手段から温風を上方又は下方から他方向へ吹き付けて搬送ベルト上の粘性物を乾燥させるようにしたバンド式乾燥機において、前記搬送ベルト上に搬送ベルトの目開き寸法よりも大きい粒径の焼却灰又は乾燥汚泥を供給する粒状物供給手段と、搬送ベルト上に供給した焼却灰又は乾燥汚泥を平面状に均して均一に散りばめる均し手段とを備え、前記均し手段は、搬送ベルトの上方位置に高さ調整自在に配設されて搬送ベルト上面との間隔を調整できると共に、搬送ベルトの幅と略同じ寸法の板状の均し部材を備えていることに特徴がある。The band-type dryer according to the present invention supplies a viscous material formed into a rod shape having a rectangular cross section by a molding machine onto an air-permeable endless conveying belt that moves around the belt, and heats the viscous material on the conveying belt. In a band-type dryer configured to blow viscous material on a conveyor belt by blowing warm air from above or below from another direction from a wind supply unit, a particle size larger than an opening dimension of the conveyor belt on the conveyor belt. Granular material supply means for supplying incinerated ash or dried sludge, and leveling means for leveling and uniformly spreading the incinerated ash or dried sludge supplied on the conveyor belt, wherein the leveling means comprises: It is characterized in that it is disposed above the conveyor belt so as to be freely adjustable in height and can adjust the distance from the upper surface of the conveyor belt, and has a plate-like leveling member having substantially the same size as the width of the conveyor belt. .

本発明に係るバンド式乾燥機の被乾燥物付着防止方法は、搬送ベルト上に予め搬送ベルトの目開き寸法よりも大きい粒径の焼却灰又は乾燥汚泥を散りばめ、散りばめた焼却灰又は乾燥汚泥上に成形した粘性物を供給するようにしているため、粘性物の乾燥処理時に付着性の高い粘性物が搬送ベルトに直接付着するのを防止することができ、また、温風により乾燥した粘性物は焼却灰又は乾燥汚泥により搬送ベルトから簡単且つ容易に剥離し、所定の乾燥粘性物を得ることができる。   The method for preventing adhesion of a material to be dried of a band-type dryer according to the present invention is as follows: incineration ash or dry sludge having a particle diameter larger than the opening dimension of the conveyor belt is preliminarily scattered on the conveyor belt; Since the viscous material molded into the viscous material is supplied, it is possible to prevent the viscous material having a high adhesiveness from directly adhering to the conveyor belt during the drying process of the viscous material. Can be easily and easily peeled off from the conveyor belt by incineration ash or dry sludge to obtain a predetermined dry viscous substance.

また、本発明に係るバンド式乾燥機の被乾燥物付着防止方法は、搬送ベルト上に供給した焼却灰又は乾燥汚泥を平面状に均して搬送ベルト上に均一に散りばめ、均一に散りばめた焼却灰又は乾燥汚泥上に粘性物を供給するようにしているため、粘性物の乾燥処理時に付着性の高い粘性物が搬送ベルトに付着するのをより確実に防止することができると共に、温風が搬送ベルトを均一に通過し易くなり、乾燥効率が高められることになる。   In addition, the method for preventing the adhered material to be dried of the band-type dryer according to the present invention is characterized in that the incinerated ash or the dried sludge supplied on the conveyor belt is evenly spread on the conveyor belt, and uniformly spread 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 viscous material having high adhesiveness from adhering to the conveyor belt during the drying process of the viscous material, and to reduce the warm air. This facilitates uniform passage through the conveyor belt, and improves drying efficiency.

更に、本発明に係るバンド式乾燥機は、搬送ベルト上に搬送ベルトの目開き寸法よりも大きい粒径の焼却灰又は乾燥汚泥を供給する粒状物供給手段と、搬送ベルト上に供給した焼却灰又は乾燥汚泥を平面状に均して均一に散りばめる均し手段と備えているため、搬送ベルト上に焼却灰又は乾燥汚泥を均一に散りばめることができ、付着性の高い粘性物が搬送ベルトに付着するのを確実且つ良好に防止することができる。   Further, the band-type dryer according to the present invention includes: a particulate matter supply means for supplying incineration ash or dry sludge having a particle size larger than a mesh size of the conveyor belt to the conveyor belt; and an incineration ash supplied to the conveyor belt. Or, since it is equipped with a leveling means for leveling dry sludge evenly and evenly, the incineration ash or dry sludge can be evenly spread on the conveyor belt, and highly adherent viscous materials are conveyed to the conveyor belt. Can be reliably and satisfactorily prevented from adhering to the surface.

本発明の方法を実施するバンド式乾燥機を備えた汚泥焼却処理設備の一例を示すブロック図である。It is a block diagram showing an example of sludge incineration equipment provided with a band type dryer which performs the method of the present invention. 本発明に係るバンド式乾燥機の概略説明図である。It is a schematic explanatory view of a band type dryer concerning the present invention.

以下、本発明の実施形態を図面に基づいて詳細に説明する。
図1は本発明の方法を実施するバンド式乾燥機を備えた汚泥焼却処理設備の一例を示し、当該汚泥焼却処理設備は、脱水汚泥1を乾燥処理して固形燃料(乾燥汚泥1″)とし、この固形燃料を焼却処理するようにしたものであり、脱水汚泥1を乾燥処理して固形燃料(乾燥汚泥1″)とするバンド式乾燥機2と、固形燃料とした乾燥汚泥1″を焼却する汚泥焼却炉3と、ガス排出経路5に設けられ、燃焼排ガス4により汚泥焼却炉3への燃焼用空気7を加熱すると共に、バンド式乾燥機2へ供給される乾燥用空気7′を加熱して温風とする熱交換器8と、乾燥用空気7′をバンド式乾燥機2と熱交換器8との間で循環させる乾燥用空気循環路9と、バンド式乾燥機2と熱交換器8との間の乾燥用空気循環路9に介設した循環用ファン10と、バンド式乾燥機2と循環用ファン10との間の乾燥用空気循環路9に介設され、乾燥用空気7′に含まれている水分を除湿する凝縮器11と、燃焼排ガス4を排ガス処理してクリーンガスにする排ガス処理装置12とを備えている。
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 plant equipped with a band-type dryer for carrying out the method of the present invention. The sludge incineration plant dries dehydrated sludge 1 to obtain a solid fuel (dry sludge 1 ″). The solid fuel is incinerated, and a band type dryer 2 for drying the dewatered sludge 1 to obtain a solid fuel (dry sludge 1 ″) and an incineration of the dry sludge 1 ″ as the solid fuel are used. Is provided in the sludge incinerator 3 and the gas discharge path 5 to heat the combustion air 7 to the sludge incinerator 3 by the combustion exhaust gas 4 and to heat the drying air 7 ′ supplied to the band type dryer 2. A heat exchanger 8 for producing hot air, a drying air circulation path 9 for circulating drying air 7 ′ between the band dryer 2 and the heat exchanger 8, and a heat exchange with the band dryer 2. A circulation fan 10 provided in a drying air circulation path 9 between the vessel 8 and A condenser 11 is provided in the drying air circulation path 9 between the sand dryer 2 and the circulation fan 10 to dehumidify the moisture contained in the drying air 7 ', and treats the combustion exhaust gas 4 as exhaust gas. And an exhaust gas treatment device 12 for producing a clean gas.

図2は本発明の実施形態に係るバンド式乾燥機2を示し、当該バンド式乾燥機2は、脱水汚泥1を水平方向へ搬送するコンベヤ13と、コンベヤ13の一部又は全部を囲って乾燥室を形成するケーシング14と、脱水汚泥1を所望の形状に成形して成形汚泥1′とし、この成形汚泥1′をコンベヤ13上に供給する成形機15と、ケーシング14の乾燥室内に供給される乾燥用空気7′を約200℃に加熱して温風とし、この温風をコンベヤ13上の成形汚泥1′に吹き付ける温風供給手段16と、コンベヤ13上に粒状の焼却灰28を供給する粒状物供給手段17と、コンベヤ13上に供給した粒状の焼却灰28を均して均一に散りばめる均し手段18とを備えている。   FIG. 2 shows a band-type dryer 2 according to an embodiment of the present invention. The band-type dryer 2 includes a conveyor 13 that conveys the dewatered sludge 1 in a horizontal direction, and a dryer that surrounds part or all of the conveyor 13. A casing 14 that forms a chamber, a dewatered sludge 1 is formed into a desired shape to form a formed sludge 1 ′, a forming machine 15 that supplies the formed sludge 1 ′ onto a conveyor 13, and a forming machine 15 that is supplied into a 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 blown 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 scattering the granular incinerated ash 28 supplied onto the conveyor 13.

前記コンベヤ13は、一定の距離を空けて水平姿勢で配設された駆動スプロケット19及び従動スプロケット20と、両スプロケット19,20に巻き回された通気性のある無端状の搬送ベルト21と、駆動スプロケット19を回転駆動する駆動用モータ(図示省略)とを備えており、搬送ベルト21の網目や通孔を通して搬送ベルト21上の成形汚泥1′の周囲に温風を流すようにしたものである。
尚、コンベヤ13の搬送ベルト21には、耐熱性及び柔軟性を有する従来公知のワイヤコンベヤベルトが使用されている。
The conveyor 13 includes a driving sprocket 19 and a driven sprocket 20, which are disposed at a predetermined distance in a horizontal posture, an air-permeable endless transport belt 21 wound around the sprockets 19, 20, and a driving sprocket. A drive motor (not shown) for rotating the sprocket 19 is provided, and warm air is caused to flow around the formed sludge 1 ′ on the conveyor belt 21 through meshes and through holes of the conveyor belt 21. .
As the transport belt 21 of the conveyor 13, a conventionally known wire conveyor belt having heat resistance and flexibility is used.

前記ケーシング14は、コンベヤ13の上流側部分(図2の左側部分)を除く部分(コンベヤ13の中間部分及び下流側部分)を囲うように配設されて乾燥室を形成するものであり、ケーシング14の上部には、乾燥用空気7′を抜き出す空気抜き出し口14aが、また、ケーシング14の下部には、乾燥した成形汚泥1′(以下、乾燥汚泥1″と言う)及び焼却灰28を排出する排出口14bがそれぞれ形成されている。   The casing 14 is arranged so as to surround a portion (an intermediate portion and a downstream portion of the conveyor 13) excluding an upstream portion (a left portion in FIG. 2) of the conveyor 13, and forms a drying chamber. An air outlet 14a for extracting drying air 7 'is provided at an upper portion of the casing 14, and a dried molded sludge 1' (hereinafter, referred to as dry sludge 1 ") and an incineration ash 28 are provided at a lower portion of the casing 14. Outlets 14b are formed.

前記成形機15は、コンベヤ13の上流側部分の上方位置で且つケーシング14に近接して配設されており、搬送ベルト21のケーシング14内に位置する箇所に成形汚泥1′を供給できるようになっている。   The molding machine 15 is disposed at a position 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. Has become.

即ち、成形機15は、成形室を有する高圧容器22と、高圧容器22の上面に設けた投入ホッパ23と、高圧容器22内に回転自在に配設したスクリュー羽根24aを有するスクリュー軸24と、スクリュー軸24を回転駆動するモータ25と、高圧容器22の先端に配設した成形孔を有するダイス26とを備えたスクリュー押し出し式の成形機15に構成されている。   That is, the molding machine 15 includes a high-pressure container 22 having a molding chamber, a charging hopper 23 provided on the upper surface of the high-pressure container 22, a screw shaft 24 having a screw blade 24a rotatably disposed in the high-pressure container 22, The screw extrusion type molding machine 15 includes a motor 25 that rotationally drives the screw shaft 24 and a die 26 having a molding hole disposed at the tip of the high-pressure container 22.

この成形機15によれば、投入ホッパ23から成形室内に投入された脱水汚泥1は、回転駆動するスクリュー軸24によりダイス26側へ運ばれてダイス26の成形孔へ圧縮されつつ押し込まれ、ダイス26の成形孔から押し出されて棒状に成形されるようになっている。   According to the molding machine 15, the dewatered sludge 1 introduced into the molding chamber from the introduction hopper 23 is conveyed to the die 26 side by the screw shaft 24 which is driven to rotate, and is pressed while being pressed into the molding hole of the die 26, and the die It is extruded from a molding hole 26 and molded into a rod shape.

この実施形態では、成形機15は、脱水汚泥1を断面形状が一辺約1cmの矩形の棒状に成形でき、且つ棒状の成形汚泥1′を複数本同時に形成できるように構成されている。   In this embodiment, the molding machine 15 is configured so that the dewatered sludge 1 can be formed into a rectangular rod having a cross-sectional shape of about 1 cm on a side, and a plurality of rod-shaped molded sludges 1 'can be simultaneously formed.

前記温風供給手段16は、汚泥焼却排熱(燃焼排ガス4)等の熱を利用して乾燥用空気7′を加熱して温風とする熱交換器8と、熱交換器8で加熱された乾燥用空気7′をバンド式乾燥機2のケーシング14と熱交換器8との間で循環させる乾燥用空気循環路9と、ケーシング14と熱交換器8との間の乾燥用空気循環路9に介設した循環用ファン10と、ケーシング14と循環用ファン10との間の乾燥用空気循環路9に介設され、乾燥用空気7′に含まれている水分を除湿する凝縮器11と、コンベヤ13の上側の搬送ベルト21の下方位置に搬送ベルト21の長手方向及び幅方向に沿って複数配設され、搬送ベルト21上の成形汚泥1′に温風となった乾燥用空気7′を吹き付ける温風吹き出し口27とを備えており、加熱熱量の削減のために乾燥用空気7′を循環させるようにしている。   The hot air supply means 16 heats the drying air 7 ′ by using heat such as sludge incineration waste heat (combustion exhaust gas 4) to generate hot air, and is heated by the heat exchanger 8. Drying air circulation path 9 for circulating the drying air 7 ′ between the casing 14 of the band type dryer 2 and the heat exchanger 8, and a drying air circulation path between the casing 14 and the heat exchanger 8. 9 and a condenser 11 interposed in the drying air circulation path 9 between the casing 14 and the circulation fan 10 to dehumidify the moisture contained in the drying air 7 '. A plurality of drying airs 7 are provided at a position below the conveyor belt 21 above the conveyor 13 along the longitudinal direction and the width direction of the conveyor belt 21, and the formed sludge 1 ′ on the conveyor belt 21 becomes hot air. ′ Is blown out, and the amount of heating heat is reduced. And so as to circulate the drying air 7 'for.

この実施形態では、温風供給手段16は、乾燥用空気7′を約200℃に加熱して温風とし、この温風をバンド式乾燥機2のケーシング14内(乾燥室内)へ供給できるようにしている。   In this embodiment, the hot air supply means 16 heats the drying air 7 ′ to about 200 ° C. to generate hot air, so that the hot air can be supplied into the casing 14 (drying chamber) of the band type dryer 2. I have to.

尚、乾燥用空気7′を約200℃に加熱したのは、乾燥用空気7′を例えば300℃以上の熱風にすると、下水汚泥の含水率が低い場合にガス化して発火し易くなるからである。ここで熱風とは、300℃以上に加熱された乾燥用空気7′のことを言い、温風とは、約200℃に加熱された乾燥用空気7′のことを言う。   The reason why the drying air 7 'is heated to about 200 ° C. is that when the drying air 7 ′ is heated to, for example, 300 ° C. or more, it becomes gasified and easily ignites when the water content of the sewage sludge is low. is there. Here, the hot air refers to the drying air 7 ′ heated to 300 ° C. or higher, and the warm air refers to the drying air 7 ′ heated to about 200 ° C.

前記粒状物供給手段17は、コンベヤ13の搬送ベルト21の上流側上面に搬送ベルト21の目開き寸法(網目や通孔の大きさ)よりも大きい粒径の焼却灰28を供給するものであり、乾燥汚泥1″を焼却することにより得られた焼却灰28を破砕する破砕機29と、破砕機29により破砕された焼却灰28を粒径に応じて篩い分けする篩を有する粒径選別機30と、篩い分けされた焼却灰28を貯留してコンベヤ13の搬送ベルト21の上流側上面に供給する灰供給ホッパ31とを備えている。   The granular material supply means 17 supplies incineration ash 28 having a particle size larger than the opening size (mesh size or through hole) of the conveyor belt 21 to the upper surface of the conveyor 13 on the upstream side of the conveyor belt 21. , A crusher 29 for crushing incinerated ash 28 obtained by incinerating dry sludge 1 ″, and a sieve for sieving the incinerated ash 28 crushed by the crusher 29 according to the particle size. 30 and an ash supply hopper 31 that stores the incinerated ash 28 that has been sieved and supplies it to the upper surface of the conveyor 13 on the upstream side of the conveyor belt 21.

この実施形態では、粒状物供給手段17は、粒径が1mm〜10mmの焼却灰28を選別して搬送ベルト21上へ供給できるように構成されている。   In this embodiment, the granular material supply means 17 is configured to be able to select and supply the incinerated ash 28 having a particle size of 1 mm to 10 mm onto the conveyor belt 21.

前記均し手段18は、粒状物供給手段17により搬送ベルト21上に供給された焼却灰28を平面状に均して搬送ベルト21上に均一に散りばめるものであり、灰供給ホッパ31の下流側位置に高さ調整自在に配設され、搬送ベルト21の幅と略同じ寸法の板状の均し部材18aを備えている。   The leveling means 18 is for leveling the incinerated ash 28 supplied onto the transport belt 21 by the granular material supply means 17 and spreading it uniformly on the transport belt 21, and downstream of the ash supply hopper 31. A plate-like leveling member 18a is provided at a side position so as to be adjustable in height, and has substantially the same size as the width of the conveyor belt 21.

この均し手段18によれば、均し部材18aの下端と搬送ベルト21の上面との間隔を粒径が1mm〜10mmの焼却灰28が通過し得る間隔に調整することにより、灰供給ホッパ31から搬送ベルト21上に供給された焼却灰28が均し部材18aに均され、搬送ベルト21上に均一に散りばめられることになる。   According to the leveling means 18, the distance between the lower end of the leveling member 18 a and the upper surface of the conveyor belt 21 is adjusted to a distance through which the incinerated ash 28 having a particle size of 1 mm to 10 mm can pass. The incineration ash 28 supplied from above to the transport belt 21 is leveled by the leveling member 18a, and is uniformly scattered on the transport belt 21.

尚、上記の実施形態では、コンベヤ13の中間部分及び下流側部分をケーシング14で囲うようにしたが、他の実施形態においては、コンベヤ13全体をケーシング14で囲うようにしても良い。   In the above-described embodiment, the intermediate portion and the downstream portion of the conveyor 13 are surrounded by the casing 14. However, in other embodiments, the entire conveyor 13 may be surrounded by the casing 14.

また、上記の実施形態においては、コンベヤ13の搬送ベルト21上の成形汚泥1′に温風(約200℃の乾燥用空気7′)を下方から上方へ向って吹き付けるようにしたが、他の実施形態においては、搬送ベルト21上の成形汚泥1′に温風を上方から下方へ向って吹き付けるようにしても良い。   In the above embodiment, warm air (drying air 7 'at about 200 ° C.) is blown upward from the lower side onto the formed sludge 1' on the conveyor belt 21 of the conveyor 13; In the embodiment, warm air may be blown from above to below on the formed sludge 1 ′ on the conveyor belt 21.

更に、上記の実施形態においては、均し手段18を板状の均し部材18aにより形成したが、他の実施形態においては、均し手段18を搬送ベルト21の幅方向に沿って回転自在に配設した均しロール(図示省略)により形成しても良い。   Further, in the above embodiment, the leveling means 18 is formed by the plate-shaped leveling member 18a, but in other embodiments, the leveling means 18 is rotatable along the width direction of the transport belt 21. It may be formed by an arranged leveling roll (not shown).

次に、上述した構成のバンド式乾燥機2を用いて脱水汚泥1を乾燥処理する場合について説明する。   Next, a case where the dewatered sludge 1 is dried using the band-type dryer 2 having the above-described configuration will be described.

固形燃料化した乾燥汚泥1″を焼却処理する汚泥焼却炉3から排出された焼却灰28は、破砕機29により破砕処理された後、粒径選別機30により粒径が1mm〜10mmの焼却灰28と粒径が10mm以上の焼却灰28とに選別処理される。このとき、粒径が1mm〜10mmの焼却灰28は、灰供給ホッパ31に供給され、また、粒径が10mm以上の焼却灰28は、系外へ排出される。   The incinerated ash 28 discharged from the sludge incinerator 3 for incinerating the dry 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 incineration ash 28 having a particle size of 10 mm or more, at this time, the incineration ash 28 having a particle size of 1 mm to 10 mm is supplied to an ash supply hopper 31, and incineration having a particle size of 10 mm or more is performed. The ash 28 is discharged out of the system.

灰供給ホッパ31内に供給された粒径が1mm〜10mmの焼却灰28は、成形汚泥1′が搬送ベルト21上に供給される前に灰供給ホッパ31から搬送ベルト21の上流側上面に順次供給される。このとき、焼却灰28は、搬送ベルト21の目開き寸法よりも大きい粒径に形成されているため、搬送ベルト21の網目から落下することがない。   The incinerated ash 28 having a particle diameter 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 conveyor belt 21 before the formed sludge 1 ′ is supplied onto the conveyor belt 21. Supplied. At this time, since the incinerated ash 28 is formed to have a particle size larger than the opening size of the conveyor belt 21, it does not fall from the mesh of the conveyor belt 21.

搬送ベルト21の上流側上面に供給された焼却灰28は、灰供給ホッパ31の下流側に位置する均し部材18aにより均され、搬送ベルト21上に均一に散りばめられる。このとき、焼却灰28は、温風(約200℃の乾燥用空気7′)が搬送ベルト21を良好に通過できるように散りばめられている。   The incineration ash 28 supplied to the upper surface on the upstream side of the conveyor belt 21 is leveled by the leveling member 18 a located on the downstream side of the ash supply hopper 31, and is evenly spread on the conveyor 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 conveyor belt 21 satisfactorily.

一方、下水汚泥を脱水処理して得られた脱水汚泥1は、含水率が約80%(湿量基準)になっており、成形機15に投入されて複数本の棒状に成形され、予め搬送ベルト21の上面に均一に散りばめられた焼却灰28の上に供給される。そのため、付着性の高い高含水率の成形汚泥1′が搬送ベルト21に直接付着するのを防止することができる。このとき、成形汚泥1′の供給速度と搬送ベルト21の搬送速度は、同じ速度に設定されており、成形汚泥1′が滞って重なり合ったり、千切れたりするのを防止できるようになっている。   On the other hand, the dewatered sludge 1 obtained by dewatering the sewage sludge has a water content of about 80% (wet amount basis), is put into the forming machine 15, formed into a plurality of rods, and transported in advance. It is supplied onto the incinerated ash 28 uniformly spread over the upper surface of the belt 21. Therefore, it is possible to prevent the molded sludge 1 ′ having high adhesiveness and high moisture 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 transfer belt 21 are set to the same speed, so that the formed sludge 1 ′ can be prevented from being stagnant, overlapping, or broken. .

搬送ベルト21に供給された成形汚泥1′は、搬送ベルト21によりケーシング14内(乾燥室内)を搬送されながら温風吹き出し口27から上方へ向って吹き付けられる温風(約200℃の乾燥用空気7′)と接触することにより乾燥されて乾燥汚泥1″となる。このとき、成形汚泥1′が断面形状矩形の棒状に成形されているため、温風と接触する表面積が確保される。また、成形汚泥1′の表面が乾燥固化されて形状保持が可能になると共に、粉塵発生や臭気が抑制される。   The formed sludge 1 ′ supplied to the conveyor belt 21 is warm air (drying air of about 200 ° C.) blown upward from the hot air outlet 27 while being conveyed in the casing 14 (drying chamber) by the conveyor belt 21. 7 ') and is dried to form dried sludge 1 ". At this time, since the formed sludge 1' is formed in a rod shape having a rectangular cross section, a surface area in contact with warm air is secured. In addition, the surface of the formed sludge 1 'is dried and solidified to maintain its shape, and the generation of dust and odor are suppressed.

温風(約200℃の乾燥用空気7′)により乾燥された成形汚泥1′は、含水率が約70%(湿量基準)の乾燥汚泥1″となる。この乾燥汚泥1″は、付着性が強いため、直接搬送ベルト21に接触していると、搬送ベルト21が折り返し点を過ぎても搬送ベルト21の表面に付着して剥がれない。   Molded sludge 1 ′ dried by hot air (drying air 7 ′ at about 200 ° C.) becomes dry sludge 1 ″ having a water content of about 70% (wet weight basis). Due to its strong property, if it is in direct contact with the conveyor belt 21, the conveyor belt 21 adheres to the surface of the conveyor belt 21 and does not come off even after passing the turning point.

しかし、前記バンド式乾燥機2においては、搬送ベルト21上に予め搬送ベルト21の目開き寸法よりも大きい粒径の焼却灰28を均一に散りばめ、散りばめた焼却灰28の上に成形汚泥1′を供給するようにしているため、付着性の高い成形汚泥1′が搬送ベルト21に直接付着するのを防止することができ、また、温風乾燥により得られた乾燥汚泥1″は焼却灰28により搬送ベルト21から簡単且つ容易に剥がれ、排出口14bから落下排出される。   However, in the band dryer 2, incineration ash 28 having a particle size larger than the opening size of the conveyor belt 21 is evenly spread on the conveyor belt 21 in advance, and the formed sludge 1 ′ is placed on the incinerated ash 28. Is supplied, the highly adherent molded sludge 1 ′ can be prevented from directly adhering to the conveyor belt 21, and the dried sludge 1 ″ obtained by hot-air drying is treated with incinerated ash 28. As a result, the sheet is easily and easily peeled off from the conveyor belt 21, and is dropped and discharged from the discharge port 14b.

脱水汚泥1を乾燥して蒸発した水分を含んだ乾燥用空気7′は、空気抜き出し口14aから抜き出され、凝縮器11で除湿された後、熱交換器8により再加熱されてケーシング14内に供給され、乾燥熱源として循環利用される。   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, reheated by the heat exchanger 8, and re-heated in the casing 14. And is circulated and used as a drying heat source.

尚、上記の実施形態においては、搬送ベルト21上に焼却灰28を散りばめるようにしたが、他の実施形態においては、焼却灰28に替えて乾燥汚泥1″を搬送ベルト21上に散りばめようにしても良い。乾燥汚泥1″を用いる場合には、搬送ベルト21上面に載せる成形汚泥1′の厚みを薄くし、搬送ベルト21の移送速度を遅くして付着性がなくなる含水率約40%(湿量基準)以下まで乾燥を行い、乾燥汚泥1″を作る。この乾燥汚泥1″を焼却灰28の替わりに使用する。乾燥汚泥1″を作っているときには、含水率が約70%(湿量基準)の乾燥汚泥1″を製造することができず、あまり効率的でないが、乾燥汚泥1″を焼却灰28の替わりに用いることができる。   In the above embodiment, the incineration ash 28 is scattered on the conveyor belt 21, but in other embodiments, the dry sludge 1 ″ may be scattered on the conveyor belt 21 instead of the incineration ash 28. When using the dried sludge 1 ″, the thickness of the formed sludge 1 ′ placed on the upper surface of the conveyor belt 21 is reduced, the transfer speed of the conveyor belt 21 is reduced, and the water content at which adhesion is lost is about 40%. (Wet amount basis) Drying is performed to the following to produce dried sludge 1 ". This dried sludge 1" is used in place of the incineration ash 28. When producing dry sludge 1 ", it is not possible to produce dry sludge 1" having a water content of about 70% (on a wet basis), which is not very efficient. Can be used.

このように、上述したバンド式乾燥機2においては、搬送ベルト21の上面に供給される脱水汚泥1の下に焼却灰28又は含水率が約40%(湿量基準)以下の乾燥汚泥1″を敷くようにしているため、付着性が高い含水率が約70%(湿量基準)の乾燥汚泥1″であっても、搬送ベルト21から確実且つ容易に剥離し、所定の含水率の乾燥汚泥1″を得ることができる。   As described above, in the above-described band type dryer 2, the incinerated ash 28 or the dried sludge 1 ″ having a water content of about 40% or less (wet amount basis) is provided below the dehydrated sludge 1 supplied to the upper surface of the conveyor belt 21. Even if it is dry sludge 1 ″ having a high adhesiveness and a moisture content of about 70% (wet amount basis), it can be reliably and easily peeled off from the conveyor belt 21 and dried to a predetermined moisture content. Sludge 1 ″ can be obtained.

また、上記の実施形態においては、バンド式乾燥機2を用いて脱水汚泥1を乾燥処理するようにしたが、脱水汚泥1の他に、含水率及び付着性が高い畜糞、食品残渣、肥料等を乾燥処理するようにしても良い。   In the above-described embodiment, the dewatered sludge 1 is dried using the band dryer 2. However, in addition to the dewatered sludge 1, animal dung, food residue, fertilizer, and the like having a high moisture content and high adhesiveness are used. May be dried.

更に、上記の実施形態においては、乾燥用空気7′を200℃に加熱したが、乾燥用空気7′の温度は、前記温度に限定されるものではなく、例えば、上記のような畜糞、食品残渣、肥料等の被乾燥物を乾燥する場合には、200℃以上でも200℃以下でも良い。   Further, in the above embodiment, the drying air 7 'is heated to 200 ° C., but the temperature of the drying air 7' is not limited to the above-mentioned temperature. In the case of drying an object to be dried such as a residue and a fertilizer, the temperature may be 200 ° C. or higher or 200 ° C. or lower.

1は脱水汚泥、1′は成形汚泥、1″は乾燥汚泥、2はバンド式乾燥機、3は汚泥焼却炉、4は燃焼排ガス、5はガス排出経路、7は燃焼用空気、7′は乾燥用空気、8は熱交換器、9は乾燥用空気循環路、10は循環用ファン、11は凝縮器、12は排ガス処理装置、13はコンベヤ、14はケーシング、14aは空気抜き出し口、14bは排出口、15は成形機、16は温風供給手段、17は粒状物供給手段、18は均し手段、18aは均し部材、19は駆動スプロケット、20は従動スプロケット、21は搬送ベルト、22は高圧容器、23は投入ホッパ、24はスクリュー軸、24aはスクリュー羽根、25はモータ、26はダイス、27は温風吹き出し口、28は焼却灰、29は破砕機、30は粒径選別機、31は灰供給ホッパ。   1 is dewatered sludge, 1 'is formed sludge, 1 "is dry sludge, 2 is a band type dryer, 3 is a sludge incinerator, 4 is a combustion exhaust gas, 5 is a gas discharge path, 7 is combustion air, and 7' is a combustion air. Drying air, 8 a heat exchanger, 9 a drying air circulation path, 10 a circulation fan, 11 a condenser, 12 an exhaust gas treatment device, 13 a conveyor, 14 a casing, 14 a an air outlet, 14 b Is a discharge port, 15 is a molding machine, 16 is hot air supply means, 17 is granular material supply means, 18 is leveling means, 18a is a leveling member, 19 is a driving 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, and 30 is particle size sorting. Machine, 31 is an ash supply hopper.

Claims (2)

成形機により断面形状が矩形の棒状に成形した粘性物を周回移動する通気性のある無端状の搬送ベルト上に供給し、搬送ベルト上の粘性物に温風供給手段から温風を上方又は下方から他方向へ吹き付けて搬送ベルト上の粘性物を乾燥させるようにしたバンド式乾燥機において、前記粘性物の供給速度と搬送ベルトの搬送速度を同じ速度に設定し、前記搬送ベルト上に予め搬送ベルトの目開き寸法よりも大きい粒径の焼却灰又は乾燥汚泥を供給し、前記搬送ベルト上に供給した焼却灰又は乾燥汚泥を高さ調整自在な板状の均し部材により平面状に均して搬送ベルト上に均一に散りばめ、均一に散りばめた焼却灰又は乾燥汚泥上に断面形状が矩形の棒状に成形した粘性物を供給するようにしたことを特徴とするバンド式乾燥機の被乾燥物付着防止方法。 A viscous material formed into a rectangular rod shape in cross section by a molding machine is supplied onto a permeable endless conveyor belt that moves around, and warm air is supplied upward or downward from the hot air supply unit to the viscous material on the conveyor belt. In the band type dryer in which the viscous material on the conveyor belt is dried by spraying from the other direction, the feeding speed of the viscous material and the conveyor speed of the conveyor belt are set to the same speed, and the conveyor belt is previously conveyed onto the conveyor belt. The incineration ash or the dried sludge having a particle size larger than the opening size of the belt is supplied, and the incineration ash or the dried sludge supplied on the conveyor belt is leveled by a plate-shaped leveling member having an adjustable height. A dried material of a band-type drier, wherein a viscous material having a rectangular cross-sectional shape is supplied onto incinerated ash or dried sludge uniformly spread over a conveyor belt and uniformly spread over the incinerated ash or dried sludge . Anti-adhesion Law. 成形機により断面形状が矩形の棒状に成形した粘性物を周回移動する通気性のある無端状の搬送ベルト上に供給し、搬送ベルト上の粘性物に温風供給手段から温風を上方又は下方から他方向へ吹き付けて搬送ベルト上の粘性物を乾燥させるようにしたバンド式乾燥機において、前記搬送ベルト上に搬送ベルトの目開き寸法よりも大きい粒径の焼却灰又は乾燥汚泥を供給する粒状物供給手段と、搬送ベルト上に供給した焼却灰又は乾燥汚泥を平面状に均して均一に散りばめる均し手段とを備え、前記均し手段は、搬送ベルトの上方位置に高さ調整自在に配設されて搬送ベルト上面との間隔を調整できると共に、搬送ベルトの幅と略同じ寸法の板状の均し部材を備えていることを特徴とするバンド式乾燥機。A viscous material formed into a rectangular rod shape in cross section by a molding machine is supplied onto a permeable endless conveyor belt that moves around, and warm air is supplied upward or downward from the hot air supply unit to the viscous material on the conveyor belt. In the band type dryer in which the viscous material on the conveying belt is dried by spraying from the other direction, the granular material for supplying incinerated ash or dried sludge having a particle size larger than the opening size of the conveying belt onto the conveying belt. A material supply means, and leveling means for leveling and uniformly spreading the incinerated ash or dry sludge supplied on the transport belt, wherein the leveling means is adjustable in height above the transport belt. A band-type dryer provided with a plate-shaped leveling member having a dimension substantially the same as the width of the conveyor belt, while being able to adjust the distance between the conveyor belt and the upper surface of the conveyor belt.
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