CN109210870B - Drying equipment and drying method for annular inert particle fluidized bed - Google Patents
Drying equipment and drying method for annular inert particle fluidized bed Download PDFInfo
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- CN109210870B CN109210870B CN201811037913.5A CN201811037913A CN109210870B CN 109210870 B CN109210870 B CN 109210870B CN 201811037913 A CN201811037913 A CN 201811037913A CN 109210870 B CN109210870 B CN 109210870B
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- 238000001035 drying Methods 0.000 title claims abstract description 222
- 239000002245 particle Substances 0.000 title claims abstract description 120
- 239000000463 material Substances 0.000 claims abstract description 70
- 238000005192 partition Methods 0.000 claims abstract description 58
- 238000009826 distribution Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 4
- 239000006185 dispersion Substances 0.000 claims 1
- 235000011837 pasties Nutrition 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract 3
- 238000010981 drying operation Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229930195482 Validamycin Natural products 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- JARYYMUOCXVXNK-IMTORBKUSA-N validamycin Chemical compound N([C@H]1C[C@@H]([C@H]([C@H](O)[C@H]1O)O[C@H]1[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O1)O)CO)[C@H]1C=C(CO)[C@H](O)[C@H](O)[C@H]1O JARYYMUOCXVXNK-IMTORBKUSA-N 0.000 description 1
Classifications
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- 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
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- 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
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- 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
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides a drying device and a drying method of a loop-shaped inert particle fluidized bed, wherein the drying device comprises a drying box, a feeding device, a heater, a blower, an inert particle conveying device, a gas-solid separation device and a gas distribution plate, wherein a partition plate is arranged on the gas distribution plate to divide the drying box into a plurality of drying chambers; the wet material drying method is that one or more groups of heaters and blowers are used for respectively introducing gases with the same or different temperatures into a drying box, a feeding device is used for introducing wet materials into a first drying chamber, inert particles adhered with the wet materials flow into a next drying chamber in sequence under the driving force of a material level difference, the drying and product falling processes are completed, and an inert particle conveying device is used for conveying the inert particles in a final drying chamber into the first drying chamber so as to form the circulation of the inert particles in the drying box. The equipment provided by the invention can optimize the drying operation of pasty and pasty materials and improve the running reliability of the whole drying process.
Description
Technical Field
The invention belongs to the technical field of drying equipment, and particularly relates to a drying equipment and a drying method for a circular inert particle fluidized bed.
Background
The fluidized drying of inert particles is to add a certain amount of inert particles into a dryer, convey the material into a bed layer and uniformly adhere to the surface of the inert particles, fluidize the material along with the particles, and perform partial heat mass transfer by being contacted with hot air flow, and simultaneously transfer the heat stored in the particles to the material to complete partial heat mass transfer process, thereby achieving the aim of dehumidifying the material. When the material is dried in the bed, the material film is changed from elastoplasticity to elastoplasticity, and falls off from the surface of the particles in a flake or powder form under the collision of the particles, and leaves the fluidized bed along with the airflow.
In the existing inert particle fluidized bed, three stages of material adhesion, drying and shedding are carried out at the same position, wet materials are adhered again after the dry materials on the surface of inert particles shed or wet materials are adhered when the dry materials are not completely shed, and when the feeding amount of the wet materials is large or the viscosity of the wet materials is large, the inert particles and the wet materials are easy to aggregate to form a cluster, so that the dead bed phenomenon occurs.
Chinese patent CN2849609Y proposes an inert particle fluidized bed dryer, which comprises an air filter, a blower, a radiator, a heater, a screw pump, a feeder, a fluidization device, a cyclone separator, a storage barrel, a bag-type dust collector and a draught fan, wherein the device is suitable for drying pasty, liquid and other materials, but has the problems that three stages of adhesion, drying and removal of materials in a drying box can be mutually influenced, when the feeding amount of wet materials is large or the viscosity of the materials is large, a dead bed phenomenon can occur, and the heat transfer effect between inert particles and the wet materials is poor.
Disclosure of Invention
The invention aims to provide the drying equipment and the drying method for the loop-shaped inert particle fluidized bed, which aim to solve the technical problems in the prior art, and the three stages of adhesion, drying and removal of materials are respectively carried out at different positions of a drying chamber in the drying process, so that the mutual interference of the three stages is effectively avoided, and the drying efficiency of wet materials is improved.
The drying equipment of the loop-shaped inert particle fluidized bed is characterized by comprising a drying box, an inert particle conveying device and a feeding device, wherein the top of the drying box is connected with a gas-solid separation device and a draught fan through an exhaust port in sequence, the bottom of the drying box is connected with a blower through a heater pipeline, a gas distribution plate is arranged in the drying box, a plurality of partition plates are vertically arranged on the gas distribution plate, the drying box is divided into a plurality of drying chambers by the partition plates, and inert particles are filled in each drying chamber; the side feeding port of the first drying chamber is connected with a feeding device through a pipeline, and inert particles in each drying chamber flow to the next adjacent drying chamber in sequence under the action of a material level difference; and the final drying chamber is provided with an inert particle conveying device which is used for conveying the inert particles in the final drying chamber into the first drying chamber so as to form circulation of the inert particles in the drying chamber.
The drying equipment for the annular inert particle fluidized bed is characterized by further comprising a dehumidifier, wherein an air outlet pipe of the induced draft fan is connected with an air inlet pipe pipeline of the air blower through the dehumidifier, so that air led out by the induced draft fan enters the air blower after being dehumidified through the dehumidifier, and heat in tail gas is secondarily utilized.
The drying equipment for the loop-shaped inert particle fluidized bed is characterized in that a longitudinal partition plate and a plurality of transverse partition plates are arranged on a gas distribution plate, the longitudinal partition plate divides a drying box into two drying areas, and the feeding device and the inert particle conveying device are respectively arranged on the two drying areas; the transverse partition boards are perpendicularly and crosswise connected with the longitudinal partition boards, and divide the two drying areas into a plurality of drying chambers respectively.
The drying equipment for the loop-shaped inert particle fluidized bed is characterized in that the heater comprises a first heater and a second heater, and the blower comprises a first blower and a second blower; the bottom of the two drying areas is respectively provided with an air inlet chamber, the air inlet chamber at the bottom of the drying area provided with a feeding device is connected with a first blower through a first heater pipeline, and the air inlet chamber at the bottom of the drying area provided with an inert particle conveying device is connected with a second blower through a second heater pipeline.
The drying equipment of the loop-shaped inert particle fluidized bed is characterized in that the temperature of gas which is introduced into a drying area provided with a feeding device by a first air blower is 90-200 ℃, preferably 120-130 ℃; the temperature of the gas introduced into the drying area provided with the inert particle conveying device by the second blower is lower than or equal to that of the gas introduced by the first blower.
The drying equipment for the square inert particle fluidized bed is characterized in that a gap is formed between one end of the longitudinal partition plate and the inner wall of the drying box, a channel for the circulation of inert particles is formed between two drying areas, and the other end of the longitudinal partition plate is fixedly connected with the inner wall of the drying box.
The drying equipment for the annular inert particle fluidized bed is characterized in that the height of the top of the longitudinal partition plate is larger than that of the top of the transverse partition plate, so that inert particles on two sides of the longitudinal partition plate are prevented from being mixed with each other without flowing through; the two ends of the transverse partition board are connected with the inner wall of the drying box, and a gap is arranged between the bottom end and the gas distribution plate.
The drying equipment for the loop-shaped inert particle fluidized bed is characterized in that a feeding device is a spiral feeder or a liquid dispersing device, and the liquid dispersing device comprises a pump and a distributor; the gas-solid separation device is a cyclone separator or a cloth bag dust remover; the inert particle conveying device is a screw feeder.
The drying method of wet materials of the loop-shaped inert particle fluidized bed drying equipment is characterized in that after gas input by a first air blower is preheated to 90-200 ℃ by a first heater, the gas is introduced into an air inlet chamber at the bottom of a drying zone provided with a feeding device; preheating gas input by a second blower to 20-200 ℃ by a second heater, and then introducing the gas into a gas inlet chamber at the bottom of a drying zone provided with an inert particle conveying device; after the inert particles in each drying chamber are in a fluidized state, wet materials are introduced into the first drying chamber by the feeding device, the inert particles adhered with the wet materials flow into the next adjacent drying chamber in sequence under the driving force of a material level difference and finally flow into the final drying chamber, and the inert particles in the final drying chamber are conveyed into the first drying chamber by the inert particle conveying device so as to form circulation of the inert particles in the drying chamber; wet materials are sequentially subjected to the processes of adhesion, drying and falling, the fallen materials are entrained by the gas introduced, and the materials flow into a gas-solid separation device through an exhaust port to be recovered, namely, the continuous drying recovery of the wet materials is completed; the whole drying system is an open system or a closed system, the open system is that wind led out by a draught fan is directly discharged into the environment, and the air blower blows in the air in the environment; the closed system is that the air led out by the induced draft fan enters the air blower after being dehumidified by the dehumidifier, so that the heat in the tail gas can be reused, the air outlet pipe of the dehumidifier of the closed system is divided into two paths, and the two paths of air outlet pipes are respectively connected with the first air blower and the second air blower through pipelines.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention designs the interior of the inert particle dryer into a loop-shaped inert particle channel, thereby overcoming the defect that materials are easy to be bonded together and a dead bed phenomenon occurs in the existing inert particle fluidized bed drying process; in the drying process, inert particles circulate circularly in the drying chamber, and the three stages of adhesion, drying and removal of materials are respectively carried out at different positions of the drying chamber, so that the mutual interference of the three stages is effectively avoided, and the drying efficiency of wet materials is improved; the method can optimize the drying process of wet materials and reduce the production cost;
(2) The device has simple structure and small occupied area, and is suitable for industrial scale-up production.
Drawings
FIG. 1 is a schematic cross-sectional view of an open system of the present invention;
FIG. 2 is a cutaway top view of an embodiment of the present invention;
FIG. 3 is a left side view of the apparatus of the present invention;
FIG. 4 is a schematic cross-sectional view of a closed system according to the present invention;
in the figure, 1-drying box, 100-channel, 2-longitudinal partition, 3-transverse partition, 4-gas distribution plate, 5-air inlet chamber, 6-heater, 601-first heater, 602-second heater, 7-blower, 701-first blower, 702-second blower, 8-inert particle conveyor, 9-feeding device, 10-exhaust port, 11-gas-solid separation device, 12-induced draft fan, 13-dehumidifier, A-first drying chamber, C-second drying chamber, B-final drying chamber.
Detailed Description
The invention will be further illustrated with reference to specific examples, but the scope of the invention is not limited thereto.
Examples:
the utility model provides a loop-shaped inert particle fluidized bed drying equipment, includes drying cabinet 1, its top through the gas vent 10 that is equipped with in proper order with gas-solid separation device 11 and draught fan 12 pipe connection, the inside gas distribution board 4 that is equipped with of drying cabinet 1, the air-blower 7 is connected through heater 6 pipe connection to drying cabinet 1 bottom, sets up a plurality of baffles on gas distribution board 4 perpendicularly and cuts apart drying cabinet 1 into a plurality of drying chambers, all fills inert particle in every drying chamber. The side feed inlet of the first drying chamber A is connected with a feed device 9 through a pipeline, and the last drying chamber B is provided with an inert particle conveying device 8 for conveying inert particles in the last drying chamber B into the first drying chamber A so as to form circulation of the inert particles in the drying chamber.
The feeding device 9 may be a screw feeder or a liquid dispersing device comprising a pump and a distributor; the gas-solid separation device 11 can be a cyclone separator or a bag-type dust collector; the inert particle conveyor 8 may be a screw feeder.
The partition plates vertically arranged on the gas distribution plate 4 may be a longitudinal partition plate 2 and a plurality of transverse partition plates 3, and divide the drying oven 1 into a plurality of drying chambers.
The longitudinal partition plate 2 is vertically arranged on the gas distribution plate 4, the drying box 1 is divided into two drying areas, and the feeding device 9 and the inert particle conveying device 8 are respectively arranged on the two drying areas (namely, the feeding device 9 and the inert particle conveying device 8 are respectively arranged on two sides of the longitudinal partition plate 2); the transverse partition plates 3 are perpendicularly and cross-connected with the longitudinal partition plates 2, and divide the two drying areas into a plurality of drying chambers (in this embodiment, the drying chambers form a head-to-tail connection mode, the inert particles in the first drying chamber a flow into the next drying chamber in sequence and finally flow into the last drying chamber B, and the inert particle conveying device 8 conveys the inert particles in the last drying chamber B into the first drying chamber a, i.e. in fig. 2, the inert particles flow in a clockwise circulation mode).
The heater 6 includes a first heater 601 and a second heater 602, and the blower 7 includes a first blower 701 and a second blower 702; the bottoms of the two drying areas are respectively provided with an air inlet chamber 5, the air inlet chamber 5 at the bottom of the drying area provided with a feeding device 9 is connected with a first blower 701 through a first heater 601 pipeline, and the air inlet temperature is 90-200 ℃, preferably 120-130 ℃; the air inlet chamber 5 at the bottom of the drying zone provided with the inert particle conveyor 8 is connected with a second blower 702 through a pipeline of a second heater 602, and the air inlet temperature is lower than or equal to the temperature of the air fed by the first blower 701.
It can be seen that the purpose of the longitudinal partition 2 separating the drying box 1 is to: inert particles adhered with wet materials sequentially move from a first drying chamber A or a second drying chamber C to the next adjacent drying chamber, so that the phenomenon that the newly-entered wet materials are adhered to the surface of the materials which are not completely dried to cause uneven drying or dead bed can be effectively prevented, and the heat transfer can be enhanced; when the drying is carried out in the drying box, the materials are changed from elastoplasticity to elastoplasticity, and because inert particles move irregularly under the fluidization state, the particles collide with the particles and the walls of the particles, so that the dry materials on the surfaces of the inert particles are carried by gas after being flaked or powder-shaped, and flow into the gas-solid separation device 11 through the exhaust port 10 for material recovery.
The transverse partition plates 3 are vertically and crosswise connected with the longitudinal partition plates 2, the drying box 1 is divided into a plurality of drying chambers, and the drying chambers are formed in the drying box 1 in an end-to-end mode. In the wet material drying process, the wet material flows into the first drying chamber A (or the wet material can be also introduced into the second drying chamber C adjacent to the first drying chamber A, the feeding device 9 is also arranged on the second drying chamber C), the inert particles adhered with the wet material sequentially flow into the next adjacent drying chamber under the driving force of the material level difference and finally flow into the last drying chamber B, and the inert particle conveying device 8 conveys the inert particles in the last drying chamber B into the first drying chamber A so as to form a circulating flow route of the inert particles.
The height of the top of the longitudinal partition plate 2 is larger than that of the top of the transverse partition plate 3, so that inert particles on two sides of the longitudinal partition plate 2 are prevented from being mixed with each other without flowing, and the circulating flow of the inert particles cannot be formed; as shown in fig. 2, the inert particles with the wet material adhered thereto flow into the next adjacent drying chamber in sequence along the longitudinal partition 2 by the level difference driving force.
In the above inert particle flowing process, a channel 100 for flowing inert particles needs to be provided between two drying areas, which can be as follows: one end of the longitudinal partition plate 2 is connected with the inner wall of the drying box 1, a gap is arranged between the other end of the longitudinal partition plate 2 and the inner wall of the drying box 1, the gap is a channel 100 between two drying areas, namely, as shown in fig. 2, inert particles flow rightwards along the longitudinal partition plate 2 in the drying area provided with the feeding device 9, return back into the drying area provided with the inert particle conveying device 8 through the channel 100, and then flow leftwards along the longitudinal partition plate 2 to form an inert particle circulation flow route which is connected end to end (namely, as shown in fig. 2, the first drying chamber A and the last drying chamber B are connected, so that the inert particle conveying device 8 is beneficial to conveying inert particles in the last drying chamber B into the first drying chamber A, and the circulation flow of the inert particles is formed).
The whole drying system is an open system or a closed system, the open system is that wind led out by a draught fan 12 is directly discharged into the environment, and the air blower 7 blows in the environment; the closed system is that the air led out by the induced draft fan 12 enters the blower 7 after being dehumidified by the dehumidifier 13, so that the heat in the tail gas can be reused, the air outlet pipe of the dehumidifier 13 of the closed system is divided into two paths, and the two paths of air outlet pipes are respectively connected with the first blower 701 and the second blower 702 through pipelines.
The drying method of the wet material in this embodiment is as follows:
the length of the adopted drying box 1 is 0.4 m, the width of the dense phase zone is 0.2 m, the width of the expansion section is 0.44 m, the total height is 1 m, a gas distribution plate 4 is arranged in the drying box 1, a longitudinal partition plate 2 with the height of 0.32m and the length of 0.35m is vertically arranged on the gas distribution plate 4, and the longitudinal partition plate 2 bisects the drying box 1;
one end of the longitudinal partition plate 2 is connected with the inner wall of the drying box 1, and the other end of the longitudinal partition plate is provided with a gap which is 0.05m away from the inner wall of the drying box 1, wherein the gap is a channel 100;
three transverse partition plates 3 with the height of 0.24 and m are arranged in the dryer 1, wherein the distance between the transverse partition plates 3 and the gas distribution plate 4 is 0.02 m, the transverse partition plates 3 are vertically and crosswise connected with the longitudinal partition plates 2, and two ends of the transverse partition plates 3 are fixedly connected with the inner wall of the dryer 1; the longitudinal partition plates 2 and the transverse partition plates 3 divide the drying box 1 into 8 drying chambers of equal length and width of 0.1 and m.
The gas distribution plate 4 is provided with open mesh holes, the aperture ratio of the open mesh holes is 14%, the aperture of each hole is 1.5 and mm, and inert particles with the static bed height of 80 and mm ceramic balls are evenly paved in each drying chamber.
The air volume input by the first blower 701 is 780 and 780 m 3 After preheating the air of/h to 125 ℃ by a first heater 601, introducing the air into an air inlet chamber 5 at the bottom of a drying area provided with a feeding device 9; the second blower 702 inputs 780 and m air quantity 3 The normal temperature air of/h is directly communicated into the air inlet chamber 5 at the bottom of the drying area provided with the inert particle conveying device 8; the whole drying system adopts an open system;
after inert particles in the drying box 1 are in a fluidized state, wet materials (validamycin solution with the moisture content of 70% is selected as a wet base and is fed by a peristaltic pump according to the feeding amount of 20 kg/h, the solution belongs to cold brittle materials and is softened at 102 ℃), the inert particles adhered with the wet materials flow into the next adjacent drying chamber in sequence under the driving force of a material level difference, and an inert particle conveying device 8 (a screw feeder) conveys the inert particles in the last drying chamber B into the first drying chamber A so as to form the circulation of the inert particles in the drying chamber; the wet materials are sequentially subjected to the processes of adhesion, drying and falling, the fallen materials flow into a gas-solid separation device 11 (a cyclone separator) through a gas entrainer and an exhaust port 10, and the materials are recovered, namely, the continuous drying recovery of the wet materials is completed; the wet material of this example was dried well and the product was collected in a cyclone and the average moisture content of the product was determined to be 0.5%.
What has been described in this specification is merely an enumeration of possible forms of implementation for the inventive concept, and the scope of protection of the present invention should not be construed as limited to the specific forms set forth in the examples, nor is it intended that the scope of protection of the present invention be limited to only equivalent technical means as would occur to those skilled in the art based on the inventive concept.
Claims (8)
1. The drying equipment for the annular inert particle fluidized bed is characterized by comprising a drying box (1), an inert particle conveying device (8) and a feeding device (9), wherein the top of the drying box (1) is sequentially connected with a gas-solid separation device (11) and a draught fan (12) through an exhaust port (10), the bottom of the drying box (1) is connected with a blower (7) through a heater (6) pipeline, a gas distribution plate (4) is arranged in the drying box (1), a plurality of partition plates are vertically arranged on the gas distribution plate (4), the partition plates divide the drying box (1) into a plurality of drying chambers, and inert particles are filled in each drying chamber;
the side feeding port of the first drying chamber (A) is connected with a feeding device (9) through a pipeline, and inert particles in each drying chamber flow to the next adjacent drying chamber in sequence under the action of a material level difference; an inert particle conveying device (8) is arranged on the final drying chamber (B) and used for conveying inert particles in the final drying chamber (B) into the first drying chamber (A) so as to form circulation of the inert particles in the drying chamber;
a longitudinal partition plate (2) and a plurality of transverse partition plates (3) are arranged on the gas distribution plate (4), the longitudinal partition plate (2) divides the drying box (1) into two drying areas, and the two drying areas are respectively provided with the feeding device (9) and the inert particle conveying device (8); the transverse partition boards (3) are vertically and crosswise connected with the longitudinal partition boards (2), and the two drying areas are respectively divided into a plurality of drying chambers;
a gap is formed between one end of the longitudinal partition plate (2) and the inner wall of the drying box (1) to form a channel (100) between two drying areas for the circulation of inert particles, and the other end of the longitudinal partition plate (2) is fixedly connected with the inner wall of the drying box (1);
the height of the top of the longitudinal partition plate (2) is larger than that of the top of the transverse partition plate (3) so as to prevent inert particles on two sides of the longitudinal partition plate (2) from being mixed with each other without flowing down.
2. The drying equipment for the annular inert particle fluidized bed according to claim 1, further comprising a dehumidifier (13), wherein an air outlet pipe of the induced draft fan (12) is connected with an air inlet pipe pipeline of the air blower (7) through the dehumidifier (13), so that air led out by the induced draft fan (12) enters the air blower (7) after being dehumidified through the dehumidifier (13) so as to secondarily utilize heat in tail gas.
3. A loop-shaped inert particle fluid bed drying apparatus according to claim 1, characterized in that the heater (6) comprises a first heater (601) and a second heater (602), the blower (7) comprises a first blower (701) and a second blower (702); the bottom of the two drying areas is respectively provided with an air inlet chamber (5), the air inlet chamber (5) at the bottom of the drying area provided with a feeding device (9) is connected with a first blower (701) through a first heater (601) pipeline, and the air inlet chamber (5) at the bottom of the drying area provided with an inert particle conveying device (8) is connected with a second blower (702) through a second heater (602) pipeline.
4. A loop-shaped inert particle fluid bed drying apparatus according to claim 3, characterized in that the temperature of the gas introduced into the drying zone provided with the feeding device (9) by the first blower (701) is 90-200 ℃; the temperature of the gas fed by the second blower (702) is lower than or equal to the temperature of the gas fed by the first blower (701).
5. A loop-shaped inert particle fluid bed drying apparatus according to claim 4, characterized in that the gas temperature introduced by the first blower (701) into the drying zone provided with the feeding means (9) is 120-130 ℃.
6. A drying apparatus for fluidized bed of inert particles in the shape of a loop according to claim 1, characterized in that both ends of the transverse partition plate (3) are connected with the inner wall of the drying oven (1), and a gap is provided between the bottom end and the gas distribution plate (4).
7. A loop-shaped inert particle fluid bed drying apparatus according to claim 1, characterized in that the feeding means (9) is a screw feeder or a liquid dispersion device comprising a pump and a distributor; the gas-solid separation device (11) is a cyclone separator or a cloth bag dust remover; the inert particle conveying device (8) is a screw feeder.
8. A method for drying wet materials based on the loop-shaped inert particle fluidized bed drying equipment as claimed in claim 1, which is characterized in that after the gas input by a first blower (701) is preheated to 90-200 ℃ by a first heater (601), the gas is introduced into an air inlet chamber (5) at the bottom of a drying zone provided with a feeding device (9); after the gas input by the second blower (702) is preheated to 20-200 ℃ by the second heater (602), the gas is introduced into an air inlet chamber (5) at the bottom of a drying area provided with an inert particle conveying device (8);
after the inert particles in each drying chamber are in a fluidized state, wet materials are introduced into the first drying chamber (A) through a feeding device (9), the inert particles adhered with the wet materials flow into the next adjacent drying chamber in sequence under the driving force of a material level difference and finally flow into the last drying chamber (B), and an inert particle conveying device (8) conveys the inert particles in the last drying chamber (B) into the first drying chamber (A) so as to form circulation of the inert particles in the drying chamber; wet materials are sequentially subjected to the processes of adhesion, drying and falling, the fallen materials are entrained by the gas introduced, and the materials flow into a gas-solid separation device (11) through an exhaust port (10) to be recovered, namely, the continuous drying recovery of the wet materials is completed;
the whole drying system is an open system or a closed system, the open system is that wind led out by a draught fan (12) is directly discharged into the environment, and a blower (7) blows in the air in the environment; the closed system is that gas led out by the induced draft fan (12) enters the air blower (7) after being dehumidified by the dehumidifier (13) so that heat in tail gas can be reused, an air outlet pipe of the dehumidifier (13) of the closed system is divided into two paths, and the two paths of air outlet pipes are respectively connected with a first air blower (701) and a second air blower (702) through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811037913.5A CN109210870B (en) | 2018-09-06 | 2018-09-06 | Drying equipment and drying method for annular inert particle fluidized bed |
Applications Claiming Priority (1)
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