GB2116872A - Drying apparatus with air filter - Google Patents

Drying apparatus with air filter Download PDF

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Publication number
GB2116872A
GB2116872A GB08307168A GB8307168A GB2116872A GB 2116872 A GB2116872 A GB 2116872A GB 08307168 A GB08307168 A GB 08307168A GB 8307168 A GB8307168 A GB 8307168A GB 2116872 A GB2116872 A GB 2116872A
Authority
GB
United Kingdom
Prior art keywords
filtering
bags
chamber
drying
dust
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.)
Granted
Application number
GB08307168A
Other versions
GB2116872B (en
GB8307168D0 (en
Inventor
Janetti Claudio Bianchi
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.)
ITALIANA ESSICCATOI
Original Assignee
ITALIANA ESSICCATOI
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 ITALIANA ESSICCATOI filed Critical ITALIANA ESSICCATOI
Publication of GB8307168D0 publication Critical patent/GB8307168D0/en
Publication of GB2116872A publication Critical patent/GB2116872A/en
Application granted granted Critical
Publication of GB2116872B publication Critical patent/GB2116872B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/04—Cleaning filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
    • B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
    • B01D46/0046—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding provoking a tangential stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4281—Venturi's or systems showing a venturi effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/005—Separating solid material from the gas/liquid stream
    • B01J8/006—Separating solid material from the gas/liquid stream by filtration
    • 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
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Wet granular solids are dried in a fluidised bed by a current of hot air in chamber 2, and the air passes upwards from the bed and inwards through filter bags 14, which are provided with Venturi nozzles 22 and compressed air jets 28 to blow the accumulated dust periodically from their outer surfaces and back into the chamber 2 or to the bottom of the filter chamber 2. <IMAGE>

Description

SPECIFICATION Dryer/filter system with filter cleaning device This invention relates to a drying apparatus equipped with a device for cleaning automatically and cyclially, the filters where removal of the deposited dust is performed mechanically and recirculated to the dryer.
In the usual drying systems for granular and similar materials, the air from the dryer which carries dust particles in suspension is filtered by causing it to pass through the interior of filtering bags while the clean air is aspirated on the outside of said bags and returned to the atmospheric or recirculated, if required.
The dust layer or cake which collects inside said bags rapidly forms an obstacle to the passage of air and reduces the performance of the system.
The filters are equipped with suitable mechanical rapping systems for the filter bags to remove the accumulated dust layer deposited on the bags themselves.
The bag filters are so arranged that the fouled air flows through the bags centrifugally so that detachment and removal of the deposited dust must take place frequently whilst disposal of the dust removed from the bags is quite difficult.
To obviate these and other drawbacks is the scope of the present invention in the sense that it ensures and facilitates removal of the deposited dust in the filtering bags, ensuring an average flow of the filtered air, increasing performance and hence operating economy of the system.
The system according to the invention, in which the granular material is distributed on the dryer grate, above which is fitted the chamber with the filter bags provided with means for removal of the dust deposited on them, is characterized in that the filtering chamber is connected directly to the underlying drying chamber, while the dirty (polluted air) is conveyed to the filter bags in a centripetal direction to collect the dust on the exterior of said bags, thereby facilitating flow of the dust into the underlying dryer.
According to this invention, the filter bags are combined with nozzles which cause detachment of the dust layer cake deposited on the exterior of said bags, consent to drop into the underlying and thence convey to a collecting bin.
The invention will now be described with reference to the annexed drawing, which illustrates, by way of example, one form of embodiment of the dryer/filter with pneumatic cleaning and dust removal device.
Specifically Figures 1 and 2 are side views and top views of the filter dryer assembly according to the invention, with parts in cross-section.
In the Figures of the drawing, the dryer of the assembly is identified with letter A and the filter with letter (B). The drying chamber 2 receives the dust laden moist material introduced by a screw conveyor K and which is subjected to a hot air current from an underlying chamber 4 into which air is admitted due to the negative pressure (draft) created by filter B and/or produced by a fan 6 combined with a pre-heating device 7.
The hot air originating from the discharge throat 8, crosses the material to be dried loaded on the grate of drying chamber 2 and is conveyed, through suitable apertures in a plate 10, which separated dryer A from filter B and delimits in the latter filtering chamber 12.
Said chamber houses a plurality of bag filters 14 (retained) secured at their top end by a filter bearing plate 16 which delimits in the top part of said chamber 12 a suction chamber 18 connected to an aspirator 20 which aspirates the hot air from device 7, which, as already stated, and if required can be associated with fan 6.
Each filter bug 14, held by plate 16, is provided, at its aperture with a nozzle 22 combined with a venturi and fed by a gas under pressure from a conduit 26.
The polluted air originating from dryer A through bag 14 in the centripetal sense and the dust deposit on the exterior of said bags and forms a stratified external layer, whilst the clean air is aspirated by fan 20. The clean air can thus be discharged or recirculated into dryer A either directly or through fan 6.
The blowing nozzles 22 are governed by one or more solenoid valves H, cyclically controlled to introduce compressed air jets, in groups of filter bags 14, with opening of the communication between a header 24 and conduits 26.
The action of the air pressure jets is increased by the presence of venturi devices 22 so that a greater pressure than that in filter chamber 12 is created, inside the bags considered, thereby to improve the detachment of the dust panel on said bags. The removal of the outer dust layer is greatly facilitated because the air pressure inside filter bag 14 considered, delates and blows up said bag thereby enhancing and causing detachment of the dust panel or layer which drops on the bottom of filtering chamber 12 (from where it can be removed in the known manner) or into the underlying drying chamber2.
The dried dust laden material is discharged, through mouth 9, provided on the side of dryer A and suitably collected.
From what above described it is evident that the objectives of the invention are achieved in particular, the automatic continuity and efficiency of the filtering action is ensured in that formation on bags 14 of dust layers of excessive thickness which would obstruct the flow of the air is inhibited.
Moreover, with the system according to this invention it is possible to treat materials with different particle sizes, up to a few microns, whilst maintaining average airflow 5 to 10 times higher with respect to that ocurring in the known plants where the dust layer or cake is caused to adhere to the surface of the filter bags in that the layer is located inside the bags themselves and during cleaning, the pressure applied from the outside of the bags, causes the latter to shrink and constipates the dust layer centripetally.

Claims (6)

1. Pneumatic drying - filtering assembly for granular and similar material, distributed in the form of a fluid bed on the grate of a dryer, above which is situated the chamber with the filter bags provided with means to remove the dust deposited on them, characterized in that filter chamber 12 is connected directly with underlying drying chamber (2) while the polluted air is conveyed into the bags in a centripetal direction to collect said dust on the exterior of said bags to facilitate passage of the dust into the underlying dryer.
2. Drying and filtering assembly according to claim 1, characterized by fluid pressure nozzles (28) associated with the openings of the filtering bags (14) located in filtering chamber (12) and provided with shut-off means (24) which may be cyclically actuated to introduce into said bags, in countercurrent to the air coming from the dryer, gas jets to remove and unclog from said bags the dust collected on their external surfaces.
3. Filtering-drying assembly according to claims 1 and 2 characterized in that nozzles (28) are set coaxially on the discharge openings of the filter bags and are associated with Venturi tubes (22) so that when the nozzles are operated inside bags (14) a pressure exceeding or at least equal to the pressure prevailing in chamber (12) which houses said filtering bags is established.
4. Filtering-drying assembly according to claims 1 and 3 characterized in that filtering chamber (12) communicates directly with underlying drying chamber (2).
5. Filtering-drying assembly according to claims 1-4, characterized in that filtering chamber (12) is connected, via filtering bags (14), with a suction chamber (18) separated from said filtering chamber by a baffle (16) which supports said filtering bags (14) and the venturi tubes (22).
6. Filtering-drying assembly according to claims 1-5, characterized by the form of embodiment shown on the annexed drawing and substantially as described for the purposes specified.
GB08307168A 1982-03-15 1983-03-15 Drying apparatus with air filter Expired GB2116872B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8221133U IT8221133V0 (en) 1982-03-15 1982-03-15 DRYER-FILTER UNIT WITH DEVICE FOR CLEANING FILTERS.

Publications (3)

Publication Number Publication Date
GB8307168D0 GB8307168D0 (en) 1983-04-20
GB2116872A true GB2116872A (en) 1983-10-05
GB2116872B GB2116872B (en) 1985-08-07

Family

ID=11177230

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08307168A Expired GB2116872B (en) 1982-03-15 1983-03-15 Drying apparatus with air filter

Country Status (7)

Country Link
CH (1) CH655170A5 (en)
DE (1) DE8306217U1 (en)
DK (1) DK62883A (en)
ES (1) ES270454Y (en)
FR (1) FR2522981A1 (en)
GB (1) GB2116872B (en)
IT (1) IT8221133V0 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159435A (en) * 1984-03-31 1985-12-04 Madaus & Co Dr Pneumatic mixing device for flowable material
EP0611937A1 (en) * 1993-02-15 1994-08-24 DRAISWERKE GmbH Mixer-dryer
EP0859658A1 (en) * 1993-09-23 1998-08-26 Scott A. Gubler Compact flexible filter assembly for a fluid bed granulator, coater or dryer
WO2001063191A1 (en) * 2000-02-25 2001-08-30 Glatt Gmbh Method for producing particulate goods
RU186511U1 (en) * 2018-09-03 2019-01-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) PLANT FOR PROCESSING BULK BODIES IN A PSEUDO-LIQUID LAYER
EP4257225A1 (en) * 2022-04-08 2023-10-11 Gausling Engineering GmbH & Co. KG Method for cleaning a filter system in a dryer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110530142A (en) * 2019-09-10 2019-12-03 连云港市沃鑫高新材料有限公司 The drying system of carborundum powder
CN110595186A (en) * 2019-09-20 2019-12-20 刘涛 Material drying device is used in grain oil processing
CN114165991A (en) * 2021-12-21 2022-03-11 江苏国朗机械制造有限公司 Quick boiling formula drying equipment of fodder granule
CN114251926B (en) * 2021-12-30 2023-03-14 宜春万申制药机械有限公司 Boiling dryer

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812244A (en) * 1956-07-09 1959-04-22 Metals Disintegrating Co A gas filtering apparatus
GB1151846A (en) * 1965-07-22 1969-05-14 Josef Pausch Cleaning of Gas Filtering Elements.
GB1225895A (en) * 1968-03-07 1971-03-24
GB1239058A (en) * 1967-08-03 1971-07-14
GB1381883A (en) * 1971-01-04 1975-01-29 Carborundum Co Filtering apparatus
GB1455281A (en) * 1973-06-23 1976-11-10 Intensiv Filter Gmbh Apparatus for the separation of dust from gases
GB1575837A (en) * 1976-03-02 1980-10-01 Kulling H Method and aparatus for removing a vaporised liquid from agas
GB2050199A (en) * 1979-05-21 1981-01-07 American Air Filter Co Filter bag-mounting arrangement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812244A (en) * 1956-07-09 1959-04-22 Metals Disintegrating Co A gas filtering apparatus
GB1151846A (en) * 1965-07-22 1969-05-14 Josef Pausch Cleaning of Gas Filtering Elements.
GB1239058A (en) * 1967-08-03 1971-07-14
GB1225895A (en) * 1968-03-07 1971-03-24
GB1381883A (en) * 1971-01-04 1975-01-29 Carborundum Co Filtering apparatus
GB1455281A (en) * 1973-06-23 1976-11-10 Intensiv Filter Gmbh Apparatus for the separation of dust from gases
GB1575837A (en) * 1976-03-02 1980-10-01 Kulling H Method and aparatus for removing a vaporised liquid from agas
GB2050199A (en) * 1979-05-21 1981-01-07 American Air Filter Co Filter bag-mounting arrangement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159435A (en) * 1984-03-31 1985-12-04 Madaus & Co Dr Pneumatic mixing device for flowable material
EP0611937A1 (en) * 1993-02-15 1994-08-24 DRAISWERKE GmbH Mixer-dryer
EP0859658A1 (en) * 1993-09-23 1998-08-26 Scott A. Gubler Compact flexible filter assembly for a fluid bed granulator, coater or dryer
EP0859658A4 (en) * 1993-09-23 1998-12-09 Scott A Gubler Compact flexible filter assembly for a fluid bed granulator, coater or dryer
WO2001063191A1 (en) * 2000-02-25 2001-08-30 Glatt Gmbh Method for producing particulate goods
RU186511U1 (en) * 2018-09-03 2019-01-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) PLANT FOR PROCESSING BULK BODIES IN A PSEUDO-LIQUID LAYER
EP4257225A1 (en) * 2022-04-08 2023-10-11 Gausling Engineering GmbH & Co. KG Method for cleaning a filter system in a dryer

Also Published As

Publication number Publication date
GB2116872B (en) 1985-08-07
DE8306217U1 (en) 1983-07-21
GB8307168D0 (en) 1983-04-20
ES270454U (en) 1983-11-01
DK62883D0 (en) 1983-02-14
CH655170A5 (en) 1986-03-27
IT8221133V0 (en) 1982-03-15
ES270454Y (en) 1984-05-01
FR2522981B3 (en) 1985-03-01
FR2522981A1 (en) 1983-09-16
DK62883A (en) 1983-09-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19990315