EP0927862A1 - Dispositif de séchage de matériaux solides, granuleux, fibreux, et/ou pâteux, avec vitesse réglable de mouvement et de remuage - Google Patents

Dispositif de séchage de matériaux solides, granuleux, fibreux, et/ou pâteux, avec vitesse réglable de mouvement et de remuage Download PDF

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Publication number
EP0927862A1
EP0927862A1 EP97122970A EP97122970A EP0927862A1 EP 0927862 A1 EP0927862 A1 EP 0927862A1 EP 97122970 A EP97122970 A EP 97122970A EP 97122970 A EP97122970 A EP 97122970A EP 0927862 A1 EP0927862 A1 EP 0927862A1
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EP
European Patent Office
Prior art keywords
drying
gases
jacket
drying chamber
installation according
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.)
Withdrawn
Application number
EP97122970A
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German (de)
English (en)
Inventor
Borghi Mauro
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.)
Vam Aerotecnica di Borghi Mauro
Original Assignee
Vam Aerotecnica di Borghi Mauro
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 Vam Aerotecnica di Borghi Mauro filed Critical Vam Aerotecnica di Borghi Mauro
Priority to EP97122970A priority Critical patent/EP0927862A1/fr
Publication of EP0927862A1 publication Critical patent/EP0927862A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined

Definitions

  • the present invention relates to a modular dynamic Drying system for granular, fibrous and / or dough Materials used in the course of the drying process do not degenerate from direct contact with the smoke; the system preferably extends horizontally; in addition, smoke is used for drying, which is the one to be dried Materials touched directly or air heated by smoke, which serves the same function.
  • a drying plant consists of one Apparatus in which the drying of the to be dried Materials taking place through heating; the materials are fed into the system where the heating takes place and where they are dried; then the unloaded dried materials, and because of the Heating evolved steam is carried over from the plant a fireplace away.
  • a known drying system consists of a chamber, the bottom of which is equipped with a gate which carries the granular material to be dried. This is held by a funnel and fed by a loading device which is located above the gate; the gases heated by a burner enter the chamber above the gate; the speed of this gas flow created by an aerator is so high that the particles of the material can remain suspended; the suspension consists of the fact that the flow force caused by the gases on the particles is in equilibrium with gravity.
  • the gases discharged from the drying system are sent to air / material separators (pellet centrifuges, electrostatic precipitators, filters, etc.), but the dried material is extracted from the system by pans and / or star extractors so that it can be partially returned.
  • the conveying system of the material together with the high transfer speeds of the layer of the material to be dried on the gates limit the application and use of these systems. Namely, the heated gases cross the material at high speed, take a lot of floating dust with them, and enter the dedusting devices directly, without an effective heat exchange due to the short time interval of the contact, therefore a low thermal efficiency is achieved; the system also facilitates the crumbling of the material and thus the formation of important amounts of dust which are carried away by the process gases, since in this case expensive and bulky separating devices, apart from high operating and maintenance costs, are essential.
  • this plant technology is chosen so that predetermined production activities can be achieved with materials that have specific physico-chemical initial characteristics.
  • the flow of the heated gases that carry out the drying process is very high in order to have all the heat available to achieve the process; on this feature there is an important consumption of thermal energy for the generation of the gases and a substantial loss of electrical energy for the creation of the flow.
  • the present invention achieves the object of providing a drying system which is suitable, regardless of the initial hygrometric conditions, of drying the granular, fibrous and / or pasty materials which are in direct contact with the Do not degenerate smoke (system with direct smoke); in addition, the invention solves the problem of creating a drying system for drying, regardless of the initial hygrometric conditions, the granular, fibrous and / or pasty materials that degenerate due to direct contact with the smoke (system with indirect smoke).
  • a second problem solved by the plant essential to the invention is that variable amounts of material can be dried, regardless of the initial hygrometric states; In this way, special planning for each system is avoided, since a certain, preferably horizontally lying rehab is achieved by independent and interdependent standardized drying units.
  • a third task consists of avoiding the installation of dust separating and / or separating systems for the separating chimneys, since the process gases do not work together with the heat exchange, as is done in the known systems.
  • the heat exchange takes place within the drying unit which is essential to the invention, for this purpose suitable speed-controlled aerators are used in order to return the warm gases which are created within the drying unit by modular burners intended for this purpose. Namely, the continuous control of the heat output and the speed of the air flow allows the heat exchange to be optimized on the material which is continuously continued and mixed without interacting with the amount of gas which is necessary for discharging the water vapor developed during drying.
  • the installation essential to the invention solves the installation problems, since the structure of the drying unit does not include any basic measures on site; namely, the drying units lie only on the floor and are connected to one another in a preferably longitudinal row.
  • This drying plant reduces manufacturing costs and energy loss because it does not use any important plants for separating the air from the material on the discharge side of the exhaust gases because of the low flow rate that characterizes the drying process.
  • the system allows adaptability in production.
  • the advantages achieved by the invention are in essential to see that the speed of the Funding, the thermal output of the feeding devices for the warm gases, the flow of the Reflux aerator and that through the Unloading devices of air saturated with water vapor caused flow depending on the physico-chemical Controlled the initial characteristics of the material to be dried the drying process with regard to the To optimize final features of the material that each Drying chamber of the system is unloaded.
  • the drying plant according to the invention comprises at least a drying chamber delimited by a jacket; There are several funds within the drying chamber contain, which the material to be dried from a Feed opening to an exit opening of the Take drying chamber with you; moreover, the facility is with following devices: hot gas generator, which are the warm gases to be sent into the drying chamber generate discharge means for discharging the water vapor saturated gases that are inside the drying chamber and ventilation means, which the warm gases on straighten the material to be dried and swirl the Create gases within the drying chamber; finally, sensors are provided in the system, which the thermodynamic values of the gases within the Measure drying chambers, as well as control devices, which relate to the subsidies, the hot gas generators, the Aerating means, and the projection means depending of the values measured by the sensors act to Optimize drying processes.
  • the funding is in the lower side of the drying chambers.
  • the funding is preferably mechanical Devices equipped for stirring and crushing of the material during its displacement from the Serve up to the exit opening to the Heat exchange between the warm gases and the material too increase.
  • the flow of the discharge means has the value that is necessary and sufficient to ensure that during the taking place in the various drying chambers of the Plant process to remove developed steam, thus the energy consumption for heating the drying gases and the formation of floating dust can be restricted.
  • the ventilation means create swirls of warm gases inside the drying chambers, in which Deflection elements are provided to prevent the eddies according to the material to be dried by the funding taken away, be judged.
  • the longitudinal axis of the jacket is up a few degrees so inclined that the feeding end is at a height is smaller than the exit end.
  • the feed opening of the jacket is one Loading entrance for the introduction of the to be dried Material connected to the drying chamber.
  • the feed opening is located of the jacket below the exit opening of a jacket, which occurs in a jacket rotation, whereby the Exit opening above the feed opening of a jacket is located, which comes after in the jacket rotation.
  • the hot gas generators consist of a majority of burners, which the in the limited by the coat Generate drying chamber to send combustion gases.
  • combustion air comes from the burners from the outside part of the plant; only additional Combustion air comes from the drying chambers.
  • the Hot gas generator one or more burners, which the for the drying taking place inside the drying chamber generate necessary heat; gets a majority of fans the warm gases from one or more heat exchangers, where the heat exchanges between the Combustion gases from the burner and to the jacket too sending air.
  • the expansions consist of a chimney with forced Ventilation of the inside of the drying chamber sucks contained gases; the flow through the Discharge means sucked gases has a value that to remove what is created by the drying process Water vapor is necessary and sufficient.
  • the loading entrance preferably has a square one Cut on; an airtight device is for handicapping an unwanted air entrance above the loading entrance used so a proper counterflow of saturated Exhaust gas is reached.
  • the sensors measure the thermodynamic features within the surrounding space of the different drying chambers (Temperature, moisture content and the like); the feelers work together with devices that the Controlling drying process generating devices: i.e. the subsidies, the hot gas generators, the discharge means and the aeration means (reflux aerator).
  • the drying unit of the drying system of Fig. 1 essentially consists of a jacket 1; a pair of aerators 2 and a pair of burners 3 are supported by the jacket 1; a deposition chimney 4 supported by the jacket 1 is located above a wall 5 which is arranged on the side of the feed of the jacket 1, the deposition chimney 4 with a degasser 7 for forced suction of the gases saturated with water vapor which are contained within the jacket 1 are equipped.
  • a loading entrance 8 is located in the lower side of the deposition chimney 4; this loading entrance 8 is connected to the inner part of the jacket 1.
  • the wall 5 supports the bearings 9 of a majority of conveyor shafts rotated by reduction gears 10 and supported by a wall 6 located on the exit side of Fig.2.
  • the reduction gears 10 are fed by speed converters which are controlled by devices known and not shown in the rest of the current state of the art.
  • Figures 3 and 4 represent a section of the drying unit of Figure 1; the walls of the jacket 1 are thermally insulated to minimize heat loss; a drying chamber 11 is delimited by the jacket 1; the burners 3 generate the combustion gases to be sent into the drying chamber 11, whereas the aerators 2 mix the air inside the drying chamber 11 with the warm gases, the aerators 2 mixing up towards the bottom of the drying chamber 11 , in which the conveyor shafts 12 are arranged.
  • a screen 13 is provided, which is attached to the jacket 1; this screen 13 deflects the flow of the aerators 2 to the drying chamber 11 underneath, so that the mixing efficiency of the air with the warm gases coming from the burners 3 is increased; In this way, a close contact between the air-warm gas mixture and the material that is located in the drying chamber 11 underneath is achieved.
  • the aerators 2 create vortices of warm gases within the drying chamber 11, while the screen 13 serves to direct the vortices towards the material to be dried, which is carried along by the conveyor shaft 12.
  • the vortices have a stationary movement within the drying chamber 11, therefore the change in material and energy is so limited that it is necessary and sufficient for producing the drying process; in addition, the axes of rotation of the vortices are perpendicular to the direction of movement of the material.
  • the material to be dried which falls from the loading entrance 8 into the lower side of the drying chamber 11 above a feed opening 14, is carried by the shafts 12 to an exit opening 15, which comes out due to the weight.
  • Appropriate sensors are provided for this purpose, which measure the thermodynamic values of the vertebra; further devices are used to change the operating states of the aerator 2, the shafts 12, the burner 3, and the degasser 7 of the chimney 4.
  • a drying process is thus carried out, by means of which the values mentioned are checked and controlled at all times, so that the process with regard to the requirements of effectiveness, economy, duration and such can be optimized.
  • Fig.5 shows a cross section of the structures of the previous figures.
  • the funding level 12 shown in Fig.6 has a majority on helical blades 16, which together with the bottom 17 of the drying chamber 11 (Fig.5) act to Material as it moves from feed opening 14 broken after the exit opening 15 and stirred hold; in this way the material experiences a tight Touch with the heat created by the burner 3 Gases stirred by the aerator 2 and on the Conveyor shafts 12 are directed so that the drying effect is increased. Therefore, the conveyor shafts 12 are on the Floor 17 of the drying chamber 11 to achieve a convenient Movement of the material to be dried from the Feed opening 14 to the outlet opening 15, the Movement is the stirring of the same material at the same time.
  • FIGs 7 and 8 is a drying plant shown, which consist of two rows Drying units exist; the coat 1a and 1b of the two Drying units are connected so that the partially dried material in the first drying unit falls into the second drying unit because of the heaviness which is the last drying process.
  • the Drying process with both drying units works with the same course of the drying process at one only drying unit before, except that the material first method in the first drying unit in this Experienced the case.
  • To control the two Drying processes are in each drying chamber 11a, 11b own control sensors and devices provided that like each of the drying chamber 11 of only one Drying unit are existing drying system.
  • FIGs 9 and 10 is a drying plant shown, which consist of four rows Drying units exist; the coat 1a, 1b, 1c, 1d the Drying units are connected so that the partially dried material in the first drying unit falls into the second drying unit because of the weight, and so on until the drying unit of the jacket 1d, at which is the last drying process.
  • the Drying process in the drying units mentioned go along with the same course of the drying process a single drying unit, except that Material a first procedure in the successive Has experienced drying units in this case.
  • each Drying chamber 11a, 11b, 11c, 11d are separate control sensors -and devices are provided that work like any of the Drying chamber 11 of only one drying unit existing drying plant.
  • the material moves as shown in Figures 7, 8, 9, 10 from the feed opening 14a to the exit opening 15a of the drying chamber 11a of the first drying unit from the outlet opening 15a into the drying chamber 11b the feed opening 14b of the second drying unit, and so on until it is the exit opening 15d of the fourth Drying unit reached, from which the dried Material comes out that is suitable for ensuing Processing or storage to be sent.
  • the path of the gases in one of two drying units trained drying plant is shown in Fig.12.
  • the outside air in the drying chamber 11b of the second Drying unit in which they deal with the gases of the burners 3b mixed occurs in the created by the aerator 2 Whirl a; a first fraction of the gases in the mixture cross the drying chamber 11a of the first drying unit the feed opening 14b of the second drying unit and the outlet opening 15a of the first drying unit; in the drying chamber 11a, the gases pass through the Aerator 2 created vortex one; a second fraction the gases are sucked in through the chimney 4, from which this fraction comes out.
  • Another fraction of the gases exits the drying chamber 11b through one with the chimney 4 connected discharge line 161 out.
  • This circle of Air and the gases allow constant heat exchange between the warm gases and the material to be dried steady thermodynamic values of the gases, so that the Drying process in the drying chamber 11b of that that takes place in the drying chamber 11a, independently is going on.
  • the heat output of the burner 3, the flow of the Backflow aerator 2 and by the discharge means 4, 161 caused flow are dependent on the initial physico-chemical characteristics of the material to be dried Materiales controlled to the drying process in Dependence on predetermined details of the dried Optimize the material that comes out of the system.
  • the reduction gear 10 Conveyor shafts 12, the reflux aerator 2 Drying unit and the degasser 7 of the chimney 4 by one or more devices based on predetermined ones Operating requirements controlled independently.
  • a drying unit is shown in Figures 13 and 14 indirect smoke for materials because of a direct Degenerate contact with the smoke, shown; in this Drying unit generates a burner 20 for drying necessary heat inside the drying unit takes place, but have the combustion gases of the burner 20 no contact with the material to be dried.
  • Two Backflow aerators 18 push the gases after one Heat exchanger 21, in which the heat exchange between the combustion gases of the burner 20 and the to the drying chamber 11 below sending air is going on.
  • the reflux aerators 18 are through the jacket 1 supported the drying unit.
  • Fig.14 The path of the gases within the drying unit of Fig.13 is explained by Fig.14.
  • the outside air is through the Suction force of the chimney 4 into the drying unit above the Exit port 15 allowed to enter; the reflux aerators 18 take the air that is inside the drying unit is up to the heat exchanger 21 with, so that a circle is created by heated air which is the one to be dried Flushed material, the material of the Feed opening 14 to the exit opening 15 through the underlying conveyor shafts 7 is taken along; a A fraction of the air is drawn in through the chimney 17 in order to Moisture content within the drying chamber 11 to keep constant, however, the remaining air is through the Backflow aerator 18 for drying the material continuously touched.
  • sensors are provided which measure the thermodynamic Characteristics of the surrounding space of the different Drying chambers (temperature, moisture content and such) measure; the sensors are inside the Drying chambers, and are connected to devices, which are the facilities producing the drying process control: i.e.: the reflux aerators, the subsidies, the Warm gas generator, the expanse of the fireplace.
  • a Drying process is thus carried out, by which the mentioned values are controlled every moment so that the Procedures regarding the requirements of effectiveness, economy, duration and such, can be optimized.
  • drying system consists of several drying units the drying process is gradual, from the first drying unit; experiences the material the successive drying processes, which in the superimposed drying units take place; in Every drying process takes a significant part Amount of moisture that is a fraction of that too representing decreasing total moisture.
  • thermodynamic values within the different Drying chambers by themselves in each drying chamber various sensors and devices be sequential drying processes be achieved so that successive Drying processes can be achieved depending on the initial moisture characteristics and the chosen Details of the dried material (Final moisture content, grain structure, weights and such) being controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP97122970A 1997-12-30 1997-12-30 Dispositif de séchage de matériaux solides, granuleux, fibreux, et/ou pâteux, avec vitesse réglable de mouvement et de remuage Withdrawn EP0927862A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97122970A EP0927862A1 (fr) 1997-12-30 1997-12-30 Dispositif de séchage de matériaux solides, granuleux, fibreux, et/ou pâteux, avec vitesse réglable de mouvement et de remuage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97122970A EP0927862A1 (fr) 1997-12-30 1997-12-30 Dispositif de séchage de matériaux solides, granuleux, fibreux, et/ou pâteux, avec vitesse réglable de mouvement et de remuage

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EP0927862A1 true EP0927862A1 (fr) 1999-07-07

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EP97122970A Withdrawn EP0927862A1 (fr) 1997-12-30 1997-12-30 Dispositif de séchage de matériaux solides, granuleux, fibreux, et/ou pâteux, avec vitesse réglable de mouvement et de remuage

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1912063A1 (fr) * 2006-10-10 2008-04-16 Tibi S.p.A. Système d'analyse et de conditionnement pour matériau plastique granulaire
US20100024244A1 (en) * 1999-05-20 2010-02-04 Potter Gary J Heater and controls for extraction of moisture and biological organisms from structures
US20110047814A1 (en) * 2009-09-02 2011-03-03 General Electronic Company Drying drawer and method of drying
CN101762142B (zh) * 2010-01-29 2011-05-25 新星化工冶金材料(深圳)有限公司 烘干炉
US8863404B1 (en) * 2010-12-06 2014-10-21 Astec, Inc. Apparatus and method for dryer performance optimization system
US9382672B2 (en) 2010-12-06 2016-07-05 Astec, Inc. Apparatus and method for dryer performance optimization system
CN106959000A (zh) * 2017-05-24 2017-07-18 尹国祥 一种颗粒物料表面干燥装置
CN107218792A (zh) * 2017-07-18 2017-09-29 尹国祥 一种颗粒物料冷热气流烘干设备
US10480115B2 (en) 2014-03-06 2019-11-19 Cnh Industrial Canada, Ltd. Dehumidification system and method used for drying fibers
CN111964418A (zh) * 2020-08-19 2020-11-20 滁州明诺机械有限公司 粮食烘干设备
CN111964356A (zh) * 2020-09-01 2020-11-20 山东佳天下肥业有限公司 一种颗粒肥料干燥装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB150368A (en) * 1919-02-25 1920-09-09 Lucien Linden Method of and means for drying sewage sludge or other wet or moisture laden material
DE353714C (de) * 1922-05-26 Philipp Schneider Muldentrockner
GB192165A (en) * 1921-10-27 1923-01-29 Alfred Dangerfield Improvements in and connected with apparatus for the treatment of materials with fluids such as air or gases for the drying, cooling or like conditioning of such material
US2259210A (en) * 1937-09-25 1941-10-14 Modave Andre Apparatus for drying materials
US2636284A (en) * 1948-07-12 1953-04-28 Miami Boiler & Machine Company Handling of materials and apparatus therefor
FR2315313A1 (fr) * 1975-06-27 1977-01-21 Carad Procede et appareil pour recuperer les fines d'une boue ou d'une suspension
FR2337861A1 (fr) * 1976-01-12 1977-08-05 Texas Rendering Co Inc Installation et procede dynamique de degraissage et de deshydratation
US4643108A (en) * 1986-01-03 1987-02-17 Singelyn Daniel D Apparatus for dehydrating metal hydroxide sludge
US5143626A (en) * 1990-07-10 1992-09-01 Sludge Drying Systems, Inc. Sludge dehydrater having specially designed augers and infrared heater elements
US5186840A (en) * 1991-08-26 1993-02-16 Rdp Company Process for treating sewage sludge
EP0542578A1 (fr) * 1991-11-14 1993-05-19 Radiant Plate Drying Systems Inc. Dispositif modulaire de séchage à plaque de radiation
US5245762A (en) * 1992-08-24 1993-09-21 Hartis Dennis R Sludge drying apparatus and method

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE353714C (de) * 1922-05-26 Philipp Schneider Muldentrockner
GB150368A (en) * 1919-02-25 1920-09-09 Lucien Linden Method of and means for drying sewage sludge or other wet or moisture laden material
GB192165A (en) * 1921-10-27 1923-01-29 Alfred Dangerfield Improvements in and connected with apparatus for the treatment of materials with fluids such as air or gases for the drying, cooling or like conditioning of such material
US2259210A (en) * 1937-09-25 1941-10-14 Modave Andre Apparatus for drying materials
US2636284A (en) * 1948-07-12 1953-04-28 Miami Boiler & Machine Company Handling of materials and apparatus therefor
FR2315313A1 (fr) * 1975-06-27 1977-01-21 Carad Procede et appareil pour recuperer les fines d'une boue ou d'une suspension
FR2337861A1 (fr) * 1976-01-12 1977-08-05 Texas Rendering Co Inc Installation et procede dynamique de degraissage et de deshydratation
US4643108A (en) * 1986-01-03 1987-02-17 Singelyn Daniel D Apparatus for dehydrating metal hydroxide sludge
US5143626A (en) * 1990-07-10 1992-09-01 Sludge Drying Systems, Inc. Sludge dehydrater having specially designed augers and infrared heater elements
US5186840A (en) * 1991-08-26 1993-02-16 Rdp Company Process for treating sewage sludge
EP0542578A1 (fr) * 1991-11-14 1993-05-19 Radiant Plate Drying Systems Inc. Dispositif modulaire de séchage à plaque de radiation
US5245762A (en) * 1992-08-24 1993-09-21 Hartis Dennis R Sludge drying apparatus and method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100024244A1 (en) * 1999-05-20 2010-02-04 Potter Gary J Heater and controls for extraction of moisture and biological organisms from structures
EP1912063A1 (fr) * 2006-10-10 2008-04-16 Tibi S.p.A. Système d'analyse et de conditionnement pour matériau plastique granulaire
US20110047814A1 (en) * 2009-09-02 2011-03-03 General Electronic Company Drying drawer and method of drying
US8245414B2 (en) * 2009-09-02 2012-08-21 General Electric Company Drying drawer and method of drying
CN101762142B (zh) * 2010-01-29 2011-05-25 新星化工冶金材料(深圳)有限公司 烘干炉
US8863404B1 (en) * 2010-12-06 2014-10-21 Astec, Inc. Apparatus and method for dryer performance optimization system
US9382672B2 (en) 2010-12-06 2016-07-05 Astec, Inc. Apparatus and method for dryer performance optimization system
US10480115B2 (en) 2014-03-06 2019-11-19 Cnh Industrial Canada, Ltd. Dehumidification system and method used for drying fibers
CN106959000A (zh) * 2017-05-24 2017-07-18 尹国祥 一种颗粒物料表面干燥装置
CN107218792A (zh) * 2017-07-18 2017-09-29 尹国祥 一种颗粒物料冷热气流烘干设备
CN111964418A (zh) * 2020-08-19 2020-11-20 滁州明诺机械有限公司 粮食烘干设备
CN111964356A (zh) * 2020-09-01 2020-11-20 山东佳天下肥业有限公司 一种颗粒肥料干燥装置

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