EP0573885B1 - Séchoir circulaire à bobine pour le séchage des boues d'égout avec un arrangement de filtrage - Google Patents

Séchoir circulaire à bobine pour le séchage des boues d'égout avec un arrangement de filtrage Download PDF

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Publication number
EP0573885B1
EP0573885B1 EP93108835A EP93108835A EP0573885B1 EP 0573885 B1 EP0573885 B1 EP 0573885B1 EP 93108835 A EP93108835 A EP 93108835A EP 93108835 A EP93108835 A EP 93108835A EP 0573885 B1 EP0573885 B1 EP 0573885B1
Authority
EP
European Patent Office
Prior art keywords
air
drying
sludge
filter belt
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93108835A
Other languages
German (de)
English (en)
Other versions
EP0573885A1 (fr
Inventor
Gerhard Dipl.-Ing. Trötscher
Anton Hecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0573885A1 publication Critical patent/EP0573885A1/fr
Application granted granted Critical
Publication of EP0573885B1 publication Critical patent/EP0573885B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure

Definitions

  • the invention relates to a through-flow dryer for drying sludge according to the preamble of patent claim 1.
  • Flow-through dryers of this type are used for drying sludges of all kinds, and it is a continuous process.
  • the sludge to be dried is placed on a conveyor belt and is moved into the housing of the drying system, the inlet area and the outlet area of the housing being sealed.
  • pressure spaces are distributed in a manner known per se, spaced apart from one another in the transport direction, into which heated air is blown, which air passes through the sludge stored on the belt and enters an underlying suction space. The air is sucked out of this suction space again and led again in the circuit into the pressure space.
  • the invention has for its object to develop a through-flow dryer with a filter arrangement of the type mentioned in such a way that a higher efficiency of dust separation is achieved with relatively low manufacturing and maintenance costs.
  • the invention is characterized by the technical teaching of claim 1.
  • An essential feature of the invention is that below the conveyor belt on which the sludge to be dried is guided in the housing in the longitudinal direction, at least one filter belt is arranged in the suction space, which is traversed by the dust-laden air that flows through the conveyor belt for the sludge to be dried becomes.
  • the filter belt is driven at a continuous speed, the speed being approximately equal to the speed of the conveyor belt for the sludge.
  • the Filter belt is driven counter to the running direction of the overhead sludge conveyor belt and in a third embodiment it is provided that the drive of the filter belt - in one direction or the other - is not continuous, but intermittent.
  • the present invention therefore provides for the first time a through-flow dryer, in the suction space of which an air stream contaminated with dust passes through a movably driven filter belt.
  • the various cleaning options of the filter belt are described, it being preferred that the filter belt is penetrated by a cleaning air stream, whereby a blow box is arranged below the filter belt at mutual intervals in the running direction of the filter belt, one approximately perpendicular to the Level of the filter belt directed air flow directed against a suction box arranged above the filter belt. This removes the dust on the filter belt, removes it from the pores and meshes of the filter belt and takes it into the suction box.
  • the underside of the suction box is not formed in a plane parallel to the plane of the filter belt, but if the underside of the suction box is chamfered, ie the filter dust initially runs into a conically narrowing space on the underside of the suction box.
  • the dust can accumulate on the filter belt at a certain height; the upper layers are then only taken up by the flared, first area on the underside of the suction box. The dust is thus gradually removed so that the thinner layers of dust then reach the conically narrowed area on the underside of the suction box and can be extracted with high efficiency.
  • the filter belt can be designed as a plastic sieve belt with a certain sieve opening; however, it can also be designed as a filter fleece, which consists either of paper, plastic, textile material or the like. It is also possible to design the filter band as a metal band.
  • a separate blow box is therefore arranged below the filter belt, through which a separate, unheated air flow is directed against the filter belt.
  • suction cleaning As a cleaning device in addition to the mentioned suction cleaning other devices are also considered, such. B. compressed air cleaning, or brush cleaning.
  • the cleaning methods described can also be combined with one another.
  • the through-flow dryer essentially consists of a hermetically sealed housing 1, which is correspondingly thermally insulated in order to avoid heat losses.
  • the housing 1 has a front inlet area 2 and a rear outlet area 3.
  • the housing 1 is divided into different dryer zones, each dryer zone being designed identically, after which it is sufficient to use only one to describe only dryer zone. It goes without saying that only a small number of dryer zones are shown in the drawing shown; any number of dryer zones can be arranged in a row in the housing 1.
  • Each dryer zone consists of a fan 4 (see FIG. 2) attached to the side, which is flanged to the side of the housing 1 in a separate housing part 5. According to FIG. 2, this housing part 5 can be moved away from the housing 1 in order to make the fan more accessible.
  • the fan generates compressed air, which it blows into a pressure chamber 35 of the housing 1 via an inflow funnel 6.
  • the air then flows in the direction of arrow 9 from the inflow funnel 6 into the pressure chamber 35 and exits via recesses 25 on the underside of the pressure chamber 35 and thus flows directly through the sludge 22 to be dried and guided along a conveyor belt 18 below the recess 25.
  • the pressure chamber 35 is formed by the blow box 24.
  • the conveyor belt 18 is guided over an inlet-side tension roller 26 and an outlet-side drive roller 27. In the area of the housing 1, the conveyor belt 18 runs over a series of support rollers 23.
  • lateral partition walls 33 are provided on the support rollers 23.
  • the air then flows through the filter band 28 to be described later, where the dust discharged from the sludge to be dried is deposited as filter dust 37.
  • a heat source 8 which heats the air, is arranged in the return flow channel 7.
  • the sludge to be dried is fed in the direction of arrow 20 into a feed device 19 which is designed as a twin-screw discharge device. In this way, the sludge to be dried is applied to the conveyor belt 18 at a uniform height. Air must be able to flow through the sludge to be dried, therefore it is provided that the sludge is pelletized in order to create flow-through spaces.
  • a cellular wheel sluice 21 is arranged there, which engages sealingly with its cellular wheel in the sludge to be dried.
  • a turning wheel 10 is arranged between the individual dryer zones of the through-flow dryer, which receives and turns the sludge.
  • the turning wheel has shovel-like arms which are rotated counter to the transport direction of the sludge 22 so that each shovel arm picks up a portion of the sludge, turns it over and places it back on the conveyor belt in the transport direction.
  • a blowing duct 11 is arranged on the underside of the turning wheel 10, through which the air is blown in the direction of the arrow 12 against the underside of the conveyor belt 18.
  • the space enclosed by the turning wheel 10 is in this case hermetically sealed by a suction duct 13 through which the air generated in the blowing duct 11 is extracted.
  • the cleaning of the filter belt 28 is described in more detail below.
  • the filter band extends through the entire housing; However, it can also be provided that the filter band 28 does not extend through the entire length of the housing 1, but is only arranged at the points where dust is to be expected.
  • the cleaning of the filter dust 37 on the filter belt 28 is carried out by a cleaning unit 14, which is essentially formed from a blow box 15 arranged below the filter belt 28 (which is arranged in the suction chamber 36), the air box in the blow box 15 generating a separate air flow from the main air flow Flows through the filter belt in the direction of the arrow 12 from below and, after the filter belt has passed through, is received by a suction box 16 arranged above the filter belt but still in the suction chamber 36.
  • the underside of the suction box 16 has a conical bevel 17, this bevel having a large flow cross-section in the transport direction of the filter belt. This means that the filter dust 27 transported in the transport direction 38 into the lower region of the suction box 16 first reaches a suction chamber of larger cross-section, where the filter dust is removed in its upper regions.
  • the length of the suction path ie the length of the blow and suction box 15, 16 in the transport direction 38 must be adapted to the respective conditions, ie the type and amount of the filter dust and the transport speed in the transport direction 38.
  • the filter belt is circulated via a tensioning roller 29 arranged on the entry side, via intermediate support rollers 31 and via a drive roller 30 arranged on the discharge side.
  • a tensioning roller 29 arranged on the entry side
  • intermediate support rollers 31 and via a drive roller 30 arranged on the discharge side.
  • exhaust air pipes 32 on the side walls of the housing according to FIG. 1, via which the moist air is led from the suction chamber 36 to a central exhaust air fan.
  • sludge 22 is not to be understood as restrictive in the sense of the present invention. "Sludge” means all media to be dried, ie pasty, powdery and piece-like goods that pass through the throughflow dryer mentioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Claims (7)

  1. Séchoir à circulation d'air pour le séchage de boues, de matières pâteuses et d'autres débris perméables à l'air, constitué d'un corps (1) fermé comportant au moins une zone (1a) de séchage qui comporte un ventilateur (4), une source de chaleur (8) faisant circuler l'air de séchage, un espace (36) d'aspiration qui est relié à un espace sous pression (35) pour l'introduction d'air sec soufflé, un conduit de retour (7) pour le retour de l'air sec de l'espace d'aspiration (36) à l'espace sous pression (35), par l'intermédiaire d'un ventilateur (4) et une bande transporteuse (18) sans fin pour transporter la boue (22) et qui se déplace dans le corps (1), séchoir caractérisé en ce que dans l'espace d'aspiration (36), sous la bande transporteuse (18) est disposée au moins une bande filtrante (28) entraînée en circulation, qui s'étend sur toute la longueur de l'au moins une zone de séchage (1a), et qui est parcourue par l'air de séchage après que celui-ci a traversé la boue (22) à sécher et en ce que des ensembles ou unités à rôle de nettoyage (14) sont associés à la bande filtrante (28) pour la nettoyer, lesquels ensembles à rôle de nettoyage sont constitués d'au moins un caisson aspirant (16), doté d'un canal d'aspiration, et disposé au-dessus de la bande filtrante (28) et d'un caisson soufflant (15) disposé sensiblement à l'opposé du caisson aspirant (16) et sous la bande filtrante (28).
  2. Séchoir à circulation d'air selon la revendication 1, caractérisé en ce que la bande filtrante (28) est plus courte que la longueur du corps (1).
  3. Séchoir à circulation d'air selon la revendication 1, caractérisé en ce que la bande filtrante (28) est entraînée en continu ou par intermittence dans le sens du transport (38) réalisé par la bande transporteuse (18) ou dans le sens opposé à celui-ci.
  4. Séchoir à circulation d'air selon la revendication 1, caractérisé en ce que le caisson soufflant (15) présente une surface de soufflage sensiblement parallèle au plan de la bande filtrante (28) et en ce que le caisson aspirant (16) est doté d'une surface d'aspiration ayant une conformation de plan incliné (17) en formant un angle par rapport au sens du transport (38) réalisé par la bande filtrante (28).
  5. Séchoir à circulation d'air selon la revendication 1, caractérisé en ce que le conduit d'arrivée d'air menant au caisson soufflant (15) et le conduit d'évacuation de l'air sortant du caisson aspirant (16) de l'ensemble (14) à rôle de nettoyage sont séparés du conduit de l'air traversant la bande transporteuse (18) pour sécher la boue (22).
  6. Séchoir à circulation d'air selon la revendication 1, caractérisé en ce que la boue (22) à sécher est retournée sur la bande transporteuse (18) par un dispositif de retournement (10, 11, 12, 13).
  7. Séchoir à circulation d'air selon la revendication 6, caractérisé en ce que le dispositif de retournement (10, 11, 12, 13) est disposé entre des zones de séchage (1a, 1b) qui sont respectivement adjacentes l'une à l'autre.
EP93108835A 1992-06-09 1993-06-02 Séchoir circulaire à bobine pour le séchage des boues d'égout avec un arrangement de filtrage Expired - Lifetime EP0573885B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4218699A DE4218699C2 (de) 1992-06-09 1992-06-09 Durchström-Trockner zur Trocknung von Schlämmen mit Filteranordnung
DE4218699 1992-06-09

Publications (2)

Publication Number Publication Date
EP0573885A1 EP0573885A1 (fr) 1993-12-15
EP0573885B1 true EP0573885B1 (fr) 1997-03-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108835A Expired - Lifetime EP0573885B1 (fr) 1992-06-09 1993-06-02 Séchoir circulaire à bobine pour le séchage des boues d'égout avec un arrangement de filtrage

Country Status (6)

Country Link
US (1) US5384969A (fr)
EP (1) EP0573885B1 (fr)
JP (1) JP2716647B2 (fr)
AT (1) ATE149973T1 (fr)
DE (1) DE4218699C2 (fr)
DK (1) DK0573885T3 (fr)

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CN104266468A (zh) * 2014-10-27 2015-01-07 浙江吉达生物科技有限公司 一种网带干燥设备
CN105575859B (zh) * 2016-03-04 2018-07-17 京东方科技集团股份有限公司 一种空气帘装置
CN105716403B (zh) * 2016-03-21 2018-08-03 许恩明 一种设有自动放置物料治具机构的化工物料处理设备
CN105712030B (zh) * 2016-03-21 2018-01-05 惠州华创新材有限公司 一种设有摆动筛选装置的化工物料干燥设备
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CN105712029B (zh) * 2016-03-21 2017-12-29 徐昌虎 一种干燥兼过滤化工物料的设备
CN105716379B (zh) * 2016-03-21 2018-11-27 浙江解氏新材料股份有限公司 一种设有摆动筛选装置和回程机构的化工物料干燥设备
CN105716377B (zh) * 2016-03-21 2018-05-15 东莞市联洲知识产权运营管理有限公司 一种设有收纳机构的化工物料干燥设备
CN107089473A (zh) * 2017-06-16 2017-08-25 湖南金能自动化设备有限公司 一种棒状药卷高速夹持输送装置
CN107576178A (zh) * 2017-08-31 2018-01-12 北京环清环境科技有限公司 一种物料干燥系统及运行方法
CN109018827A (zh) * 2018-07-06 2018-12-18 安徽香妃茶业有限公司 一种茶叶过滤输送装置
CN108955198A (zh) * 2018-07-26 2018-12-07 黄山全晟密封科技有限公司 一种橡胶原材料的烘干处理设备
US11788790B2 (en) * 2019-02-21 2023-10-17 North Carolina State University Low energy drying of swine lagoon sludge or digestate
CN111232689B (zh) * 2019-11-18 2021-07-13 九江市粮油机械厂(有限公司) 一种密闭式抑尘气垫机输送装置
CN112254488A (zh) * 2020-08-31 2021-01-22 长沙跃奇节能电气设备有限公司 一种隧道式烘干装置
CN112985036B (zh) * 2021-02-07 2022-07-05 江西胜美合成材料有限公司 一种化工网带干燥机
CN113623989B (zh) * 2021-07-08 2022-07-15 河北彩客新材料科技股份有限公司 一种丁二酰丁二酸二甲酯的干燥装置
CN113686136B (zh) * 2021-08-23 2022-09-16 南昌航空大学 一种膨化饲料带式干燥机及气流路径布置方法
CN115283217B (zh) * 2022-08-12 2023-12-15 江苏万特达矿业科技有限公司 一种硬质合金盘件涂墨晾干平台
CN115950238A (zh) * 2022-12-01 2023-04-11 国家能源集团宁夏煤业有限责任公司金凤煤矿 一种煤泥收集干燥装置及工艺
CN116379746B (zh) * 2023-06-05 2023-08-22 常州市优博干燥工程有限公司 一种热风循环的带式干燥机

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Also Published As

Publication number Publication date
JP2716647B2 (ja) 1998-02-18
DE4218699A1 (de) 1993-12-16
JPH06129766A (ja) 1994-05-13
DK0573885T3 (da) 1997-08-25
EP0573885A1 (fr) 1993-12-15
US5384969A (en) 1995-01-31
ATE149973T1 (de) 1997-03-15
DE4218699C2 (de) 2000-01-20

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