CN112393530B - Drying process and equipment suitable for materials with large particle size difference and high requirement on uniformity of moisture content of products - Google Patents
Drying process and equipment suitable for materials with large particle size difference and high requirement on uniformity of moisture content of products Download PDFInfo
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- CN112393530B CN112393530B CN202011286133.1A CN202011286133A CN112393530B CN 112393530 B CN112393530 B CN 112393530B CN 202011286133 A CN202011286133 A CN 202011286133A CN 112393530 B CN112393530 B CN 112393530B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
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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
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- 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
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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Abstract
The invention discloses a drying process and drying equipment suitable for materials with large particle size difference and high requirement on the uniformity of the moisture content of a product, wherein the drying process comprises the following steps: 1. drying and cooling the materials; 2. drying medium-part of the tail gas recycle process; 3. a lump crushing and separating process; 4. and (5) dust separation process. The horizontal multi-chamber fluidized bed dryer is provided with a material inlet; a product outlet arranged in the last chamber of the horizontal multi-chamber fluidized bed dryer; a briquette outlet in the first chamber of the horizontal multi-chamber fluidized bed dryer; three tail gas outlets, one of which is in the primary drying section and the drying front section and is high-humidity tail gas, and the tail gas is discharged after dust removal; the other two tail gas outlets are low-humidity tail gas which can be recycled. This application adopts special construction's gas distributor plate, can prolong the dwell time of large granule material for thick and thin granule product moisture content is even, and energy saving and consumption reduction low emission can be realized to partial tail gas circulation process and broken piece of block piece-rate system.
Description
Technical Field
The application relates to the technical field of drying, in particular to a drying process and equipment suitable for materials which are large in particle size difference and high in requirement on the uniformity of moisture content of products.
Background
At present, a horizontal multi-chamber fluidized bed dryer is mostly adopted to dry powder materials, wet materials are fluidized, dried and cooled in each drying chamber in sequence under the action of a drying medium, and dried products are discharged from a material outlet and are packaged and stored. The punching plate has the characteristic of self-cleaning distribution plates, is applied more, and the included angles alpha and beta between the punching airflow direction and the material flowing direction are 0 to 60 degrees under the normal condition. However, there are problems that when the material is not uniform in particle size, the moisture content of the dried product is not uniform and the moisture content of the large particles is high. The equipment is used for a coating system, and the coating quantity with large particle size is small, so the problem is researched.
Meanwhile, when the horizontal multi-chamber fluidized bed dryer is used for continuously drying materials, the materials in the early stage of drying are easy to soften when heated and are easy to agglomerate and accumulate on the distribution plate, although the agglomerates can be pushed to the discharge port by adopting the punching plate and the fluidized bed is cleaned, the process of agglomerate discharge consumes heat energy.
In chinese patent CN109007727A, it is mentioned that in the fluidized bed dryer, some baffles are arranged as overflow baffles, and a flap valve is arranged below the overflow baffle to facilitate discharging agglomerates.
Disclosure of Invention
In order to solve the problems that when the traditional horizontal fluidized bed is used for drying materials with large particle size difference, the drying degree is inconsistent, the moisture content of the product cannot meet the requirement, large blocks are difficult to discharge and the like, the invention provides a drying system and equipment suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product.
The drying process suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product is characterized by comprising the following steps of:
1) And (3) material drying and cooling process:
the wet material is sent into a first chamber of a horizontal multi-chamber fluidized bed dryer through a spiral feeder, sequentially enters a primary drying section, a drying section and a cooling section of the horizontal multi-chamber fluidized bed dryer to be respectively fluidized, dried and cooled under the action of a drying medium introduced into the horizontal multi-chamber fluidized bed dryer, then enters a dust separation system to separate powder, and a dried product is discharged from a product outlet of the dust separation system, discharged through a star-shaped discharging device, screened by a screening machine and then packaged and stored;
2) Drying medium-partial tail gas recycle process:
the drying section of the horizontal multi-chamber fluidized bed dryer is divided into a drying front section and a drying rear section;
the drying medium is air, and enters the horizontal multi-chamber fluidized bed dryer by five paths, wherein the first path is air for the drying rear section; the second path is air for a cooling section and a dust separation system; the third path is air for the lump crushing and separating system; the fourth way is air for the primary drying section; the fifth path is circulating tail gas;
the first path of air is sequentially filtered by a filter II, pressurized by a blower IV and heat exchanged by a heat exchanger III to reach the required temperature and then is sent to the drying rear section of the horizontal multi-chamber fluidized bed dryer to fluidize and dry the material at the rear section, and the dried tail gas is discharged from a tail gas outlet I and a tail gas outlet II at the top of the horizontal multi-chamber fluidized bed dryer;
the second path of air is filtered by a filter III and pressurized by a blower V and then divided into two paths, one path of air is sent to a cooling section of the horizontal multi-chamber fluidized bed dryer to fluidize and cool the materials, and the cooled tail gas is discharged from a tail gas outlet II at the top of the horizontal multi-chamber fluidized bed dryer; the other strand is dehumidified by a dehumidifier, then is sent into a dust separation system to fluidize and separate dust of the material, and then is discharged from a tail gas outlet III at the top of the dust separation system;
the third path of air is filtered by a filter I and pressurized by a blower I, and then is divided into two paths, one path of air is sent into a fluidization area of a lump crushing and separating system, and the small-particle-size materials are sent back into the horizontal multi-chamber fluidized bed dryer; the other strand is sent into a crushing area of the lump crushing and separating system, and the crushed material with qualified granularity is sent back into the horizontal multi-chamber fluidized bed dryer and then discharged from a tail gas outlet I at the top of the horizontal multi-chamber fluidized bed dryer;
the fourth path of air is filtered by the medium-high efficiency filter I, pressurized by the blower II and subjected to heat exchange by the heat exchanger I to reach the required temperature, and then is sent to the primary drying section of the horizontal multi-chamber fluidized bed dryer to fluidize wet materials and remove surface moisture, and then is discharged from a tail gas outlet I at the top of the horizontal multi-chamber fluidized bed dryer;
the fifth path of air is circulating tail gas, the circulating tail gas is filtered by a middle-high efficiency filter II, pressurized by a blower III and heated by a heat exchanger II and then is sent to the front drying section of the horizontal multi-chamber fluidized bed dryer to fluidize, heat and dry the materials, and the dried tail gas is discharged from a tail gas outlet I and a tail gas outlet II at the top of the horizontal multi-chamber fluidized bed dryer;
tail gas discharged from a tail gas outlet I at the top of the horizontal multi-chamber fluidized bed dryer is dedusted by a bag-type deduster II and is exhausted outwards by an induced draft fan; tail gas discharged from a tail gas outlet II at the top of the horizontal multi-chamber fluidized bed dryer is combined with tail gas discharged from a tail gas outlet III at the top of the dust separation system, and then dust is removed by a bag-type dust remover I to form the circulating tail gas;
3) The process of crushing and separating the lumps comprises the following steps:
the agglomerate generated in the primary drying process of the horizontal multi-chamber fluidized bed dryer can be discharged from an agglomerate outlet of the horizontal multi-chamber fluidized bed dryer and enters a fluidization area of an agglomerate crushing and separating system, under the action of air flow of a drying medium, the entrained material with qualified granularity is returned back to the horizontal multi-chamber fluidized bed dryer from a material return port of the horizontal multi-chamber fluidized bed dryer, the rest agglomerate material continuously enters a crushing area of the agglomerate crushing and separating system for crushing, and the crushed material with qualified granularity is carried by the introduced drying medium and is returned back to the horizontal multi-chamber fluidized bed dryer for continuous fluidization and removal of surface moisture;
4) And (3) dust separation process:
the material dried and cooled by the cooling section of the horizontal multi-chamber fluidized bed dryer enters a dust separation system, is fluidized, continuously cooled and separated from dust under the action of the airflow of a drying medium, enters a hopper from a product outlet of the horizontal multi-chamber fluidized bed dryer, is fed into a sieving machine by a star-shaped discharging device for sieving and packaging according to the specification requirement of the product; and dust in the material is discharged from a tail gas outlet III at the top of the dust separation system along with the air flow, and is separated and collected by a bag-type dust collector I.
The drying process is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of a product, and is characterized in that in a primary drying section, a front drying section, a rear drying section and a cooling section of a horizontal multi-chamber fluidized bed dryer, the air inlet temperature of the primary drying section is 0 to 160 ℃, the air inlet temperature of the front drying section is 80 to 160 ℃, and preferably 80 to 120 ℃; the air inlet temperature of the drying section is 80-200 ℃, and preferably 100-160 ℃; the air inlet temperature of the front drying section is lower than that of the rear drying section; the air inlet temperature of the cooling section is normal temperature; the air inlet temperature of the dust separation system is 0-normal temperature.
The drying process is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that when the wet materials are heat-resistant common materials, the circulating tail gas is divided into two parts, one part is used as fourth air, and the other part is used as fifth air; when the wet material is a heat-instable material which is easy to soften and bond when being heated, the fourth path of air is selected from normal-temperature air, and the heat-instable material is preferably one of honey and vitamin D3.
The drying equipment is suitable for materials with large particle size difference and high requirement on the uniformity of moisture content of products, and is characterized by comprising a spiral feeder, a horizontal multi-chamber fluidized bed dryer, a star-shaped discharging device, a screening machine and a lump crushing and separating system, wherein the horizontal multi-chamber fluidized bed dryer comprises a primary drying section, a cooling section and a dust separating system which are sequentially arranged, the primary drying section is provided with a material inlet, and the material inlet is directly connected with the spiral feeder through a pipeline; a product outlet is arranged on the dust separation system, materials in the dust separation system can enter the hopper through the product outlet, and the outlet of the hopper is connected with the screening machine through the star-shaped discharger;
the lump crushing and separating system is in butt joint with one side of the primary drying section, a lump outlet and a material return opening are respectively formed in the lower end and the upper end of the joint of the primary drying section and the lump crushing and separating system, lumps generated in the drying process in the primary drying section can be discharged from the lump outlet and enter the lump crushing and separating system, and small-particle materials in the lump crushing and separating system can reenter the primary drying section from the material return opening under the action of air flow of a drying medium;
the top of the horizontal multi-chamber fluidized bed dryer is provided with a tail gas outlet I, a tail gas outlet II and a tail gas outlet III, and the drying section of the horizontal multi-chamber fluidized bed dryer is divided into a drying front section and a drying rear section; the tail gas outlet I is arranged above the primary drying section and the drying front section, the tail gas outlet II is arranged above the drying rear section and the cooling section, and the tail gas outlet III is arranged at the top of the dust separation system; the tail gas outlet I is connected with the bag-type dust collector II and the draught fan through a pipeline, the tail gas outlet II and the tail gas outlet III are connected with an air inlet of the bag-type dust collector I through pipelines, and circulating tail gas is discharged from an air outlet of the bag-type dust collector I.
The drying equipment is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that a whole block of gas distribution plate is arranged in the horizontal multi-chamber fluidized bed dryer, the part of the horizontal multi-chamber fluidized bed dryer below the gas distribution plate is provided with each air inlet chamber, and a corresponding drying medium is introduced into each air inlet chamber;
the horizontal multi-chamber fluidized bed dryer is internally provided with a plurality of partition plates, the partition plates divide the horizontal multi-chamber fluidized bed dryer into five parts, namely a primary drying section, a front drying section, a rear drying section, a cooling section and a dust separation system, the height of each partition plate is 30 to 100cm, and the distance between the lower end of each partition plate and a gas distribution plate is 3 to 20cm, so that the partition plates are used for material flow channels.
The drying equipment is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that the lump crushing and separating system is divided into a fluidizing area and a crushing area, a downward-inclined sieve plate is arranged in the fluidizing area, and an air inlet II is arranged at the bottom of the fluidizing area and used for introducing gas separated before the lump is crushed; a breaking-up harrow for breaking the lumps is arranged in the breaking area and is connected with a motor for driving the breaking-up harrow to rotate; the two sides of the lower end of the crushing area are respectively provided with an air inlet I and a bulk material outlet, the air inlet I is used for introducing gas separated after the block mass is crushed, and the bulk material outlet is used for discharging the crushed block mass; the included angle between the sieve plate and the horizontal direction is 15 to 45 degrees.
The drying equipment is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that the dust separation system consists of a straight separation cavity with a tubular structure and a conical tapered cavity arranged at the top of the straight separation cavity, the height of the straight separation cavity is 1.5-2 times of the height of a cooling section of the horizontal multi-chamber fluidized bed dryer so as to ensure the separation of the materials and the dust, and the conical tapered cavity is arranged above the straight separation cavity so as to ensure that the separated dust is discharged outwards in time; the opening width of the pellet outlet is 0.5-1 time of the width of a primary drying section of the horizontal multi-chamber fluidized bed dryer, the opening height of the pellet outlet is 3-10cm, an electrically-controlled small door matched with the opening size is arranged on the pellet outlet, the interval duration of opening the electrically-controlled small door and the duration of opening the door each time can be controlled by a PLC control system, the electrically-controlled small door is opened once every 1-20 minutes and is automatically closed after 5-20 seconds.
The drying equipment is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that the gas distribution plate is rectangular, is matched with the length and the width of an upper bed body and a lower bed body of a horizontal multi-chamber fluidized bed dryer, and is arranged between the upper bed body and the lower bed body of the horizontal multi-chamber fluidized bed dryer; the gas distribution plate is provided with a plurality of nail holes, the nail holes are formed by matching a horizontal plate and an arc plate, and the direction of the airflow blown out of the nail holes is similar to the horizontal flow direction under the blocking action of the arc plate;
the horizontal direction from the primary drying section to the cooling section of the horizontal multi-chamber fluidized bed dryer is the material moving direction;
the opening directions of the nail holes are set to be two modes on the gas distribution plate, the included angles between the directions of two kinds of gas flows blown out of the nail holes and the upper side and the lower side of the moving direction of the materials are respectively alpha and beta, and the included angles are respectively marked as alpha nail holes and beta nail holes; the alpha-type nail holes and the beta-type nail holes are alternately arranged on the gas distribution plate and are distributed on the whole gas distribution plate, and the range of alpha or beta is 0 to 180 degrees, preferably 90 to 180 degrees, and more preferably 120 to 150 degrees.
The drying equipment is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that the aperture ratio of the gas distribution plate is 1 to 15 percent, preferably 2 to 8 percent; the alpha-type nail holes and the beta-type nail holes are arranged on the gas distribution plate in rows, the moving direction of the material is marked as the transverse direction, and each row of alpha-type nail holes and each row of beta-type nail holes are arranged longitudinally.
The drying equipment is suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product, and is characterized in that each row of alpha-type nail holes and each row of beta-type nail holes are alternately arranged on a gas distribution plate, or each two rows of alpha-type nail holes and each two rows of beta-type nail holes are alternately arranged on the gas distribution plate.
Compared with the existing fluidized bed drying technology, the invention has the beneficial effects that:
(1) The application discloses gas distribution plate's project organization can prolong coarse grain material drying time for the product moisture content is even.
(2) The primary drying section of the horizontal multi-chamber fluidized bed dryer is connected with the lump crushing and separating system, so that the lump entering the horizontal multi-chamber fluidized bed dryer is directly discharged, the crushing treatment is carried out, and the drying energy consumption is reduced.
(3) This application reduces the exhaust emissions, retrieves the heat with the low-humidity high temperature tail gas recycle that the drying back end came out. In the drying process, the air inlet temperature of the front drying section is lower than that of the rear drying section, so that the moisture on the surface of the material is removed in the early drying stage, the moisture in the material is removed in the later drying stage, and the tail gas temperature of the rear drying section is relatively high, so that the tail gas can be recycled in the front drying section, and the energy consumption is saved.
(4) The primary drying section of the horizontal multi-chamber fluidized bed dryer can select cold air or hot air according to materials, and is suitable for drying various materials.
The system simplifies the flow, integrates the stages of drying, cooling, dust separation and the like, reduces the occupied area of equipment, can realize continuous operation, and is convenient to operate.
Drawings
FIG. 1 is a schematic structural view of a drying apparatus of the present application;
FIG. 2 is a schematic structural view of the horizontal multi-chamber fluidized bed dryer of the present application;
FIG. 3 is a schematic structural view of the agglomerate breaking and separating system of the present application;
FIG. 4 is a schematic view of the angle between the direction of the gas flow and the direction of the material movement;
FIG. 5 is a sectional view of a nail hole of the gas distribution plate;
FIG. 6 is a schematic view of alternative nail holes;
FIG. 7 is a process flow diagram of a drying system for initially heat-softenable, cementitious materials;
FIG. 8 is a flow chart of the process for drying thick and thin granular products with common materials;
in the figure: 01. the device comprises a spiral feeder, a 02 horizontal multi-chamber fluidized bed dryer, a 03 star-shaped discharger, a 04 sieving machine, a 05 lump crushing and separating system, a 06 filter I, a 07 blower I, a 08 middle-high efficiency filter I, a 09 blower II, a 10 heat exchanger I, a 11 middle-high efficiency filter II, a 12 blower III, a 13 heat exchanger II, a 14 filter II, a 15 blower IV, a 16 heat exchanger III, a 17 filter III, a 18 blower V, a 19 dehumidifier, a 20 bag-type dust remover I, a 21 bag-type dust remover II, a 22 induced draft fan.
02-1 parts of a material inlet, 02-2 parts of a material return port, 02-3 parts of an electric control small door, 02-4 parts of a lump outlet, 02-5 parts of a tail gas outlet I, 02-6 parts of a partition plate, 02-7 parts of a tail gas outlet II, 02-8 parts of a tail gas outlet III, 02-9 parts of a dust separation system, 02-10 parts of a gas distribution plate, 02-11 parts of a product outlet, 02-12 parts of a hopper, 05-1 parts of a scattering rake, 05-2 parts of a gas inlet I, 05-3 parts of a motor, 05-4 parts of a sieve plate, 05-5 parts of a gas inlet II, 05-6 parts of a bulk material outlet.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b): compare fig. 1-6
A drying device suitable for materials with large particle size difference and high requirement on the uniformity of moisture content of products comprises a spiral feeder 01, a horizontal multi-chamber fluidized bed dryer 02, a star-shaped discharging device 03, a screening machine 04 and a lump crushing and separating system 05, wherein the horizontal multi-chamber fluidized bed dryer 02 comprises a primary drying section, a cooling section and a dust separating system 02-9 which are sequentially arranged, a material inlet 02-1 is formed in the primary drying section, and the material inlet 02-1 is directly connected with the spiral feeder 01 through a pipeline; a product outlet 02-11 is arranged on the dust separation system 02-9, materials in the dust separation system 02-9 can enter the hopper 02-12 through the product outlet 02-11, and the outlet of the hopper 02-12 is connected with the sieving machine 04 through the star-shaped discharging device 03;
the lump crushing and separating system 05 is in butt joint with one side of the primary drying section, a lump outlet 02-4 and a material return opening 02-2 are respectively arranged at the lower end and the upper end of the joint of the primary drying section and the lump crushing and separating system 05, lumps generated in the drying process in the primary drying section can be discharged from the lump outlet 02-4 and enter the lump crushing and separating system 05, and small-particle materials in the lump crushing and separating system 05 can reenter the primary drying section from the material return opening 02-2 under the action of air flow of a drying medium;
the top of the horizontal multi-chamber fluidized bed dryer 02 is provided with a tail gas outlet I02-5, a tail gas outlet II 02-7 and a tail gas outlet III 02-8, and the drying section of the horizontal multi-chamber fluidized bed dryer 02 is divided into a drying front section and a drying rear section; the tail gas outlet I02-5 is arranged above the primary drying section and the drying front section, the tail gas outlet II 02-7 is arranged above the drying rear section and the cooling section, and the tail gas outlet III 02-8 is arranged at the top of the dust separation system 02-9; the tail gas outlet I02-5 is connected with a bag-type dust collector II 21 and an induced draft fan 22 through a pipeline, the tail gas outlet II 02-7 and the tail gas outlet III 02-8 are both connected with an air inlet of a bag-type dust collector I20 through pipelines, and an air outlet of the bag-type dust collector I20 discharges circulating tail gas.
Referring to fig. 2, a whole block of gas distribution plate 02-10 is arranged inside the horizontal multi-chamber fluidized bed dryer 02, the part of the horizontal multi-chamber fluidized bed dryer 02 below the gas distribution plate 02-10 is each air inlet chamber, and a corresponding drying medium is introduced into each air inlet chamber;
a plurality of partition plates 02-6 are arranged in the horizontal multi-chamber fluidized bed dryer 02, the partition plates 02-6 divide the horizontal multi-chamber fluidized bed dryer 02 into five parts, namely a primary drying section, a drying front section, a drying rear section, a cooling section and a dust separation system 02-9, the height of the partition plates 02-6 is 30 to 100cm, and the distance from the lower ends of the partition plates to a gas distribution plate is 3 to 20cm, so that the partition plates are used for material flow channels.
Referring to fig. 3, the lump crushing and separating system 05 is divided into a fluidizing zone and a crushing zone, a downward-inclined sieve plate 05-4 is arranged in the fluidizing zone, an air inlet II 05-5 is arranged at the bottom of the fluidizing zone, and the air inlet II 05-5 is used for introducing gas separated before lump crushing; a breaking-up harrow 05-1 for breaking the lumps is arranged in the breaking area, and the breaking-up harrow 05-1 is connected with a motor 05-3 for driving the breaking-up harrow to rotate; two sides of the lower end of the crushing area are respectively provided with an air inlet I05-2 and a large block material outlet 05-6, the air inlet I05-2 is used for introducing gas separated after the block mass is crushed, and the large block material outlet 05-6 is used for discharging the crushed block mass; the included angle between the screen hole plate 05-4 and the horizontal direction is 15-45 degrees.
The dust separation system 02-9 consists of a straight separation cavity in a tubular structure and a conical tapered cavity arranged at the top of the straight separation cavity, the height of the straight separation cavity is 1.5-2 times of the height of a cooling section of the horizontal multi-chamber fluidized bed dryer 02 so as to ensure the separation of materials and dust, and the conical tapered cavity is arranged above the straight separation cavity so as to ensure that the separated dust is discharged outwards in time; the opening width of the briquette outlet 02-4 is 0.5-1 time of the width of a primary drying section of the horizontal multi-chamber fluidized bed dryer 02, the opening height of the briquette outlet 02-4 is 3-10cm, an electric control small door 02-3 matched with the opening size is arranged on the briquette outlet 02-4, the interval duration of opening the electric control small door 02-3 and the duration of opening the door each time can be controlled by a PLC control system, the electric control small door is opened once every 1 to 20 minutes and is automatically closed after 5 to 20 seconds.
Further, the shape of the gas distribution plate 02-10 is rectangular, the length and the width of the gas distribution plate are matched with the length and the width of the upper bed body and the lower bed body of the horizontal multi-chamber fluidized bed dryer 02, and the gas distribution plate is arranged between the upper bed body and the lower bed body of the horizontal multi-chamber fluidized bed dryer 02; the gas distribution plate 02-10 is provided with a plurality of nail holes, the nail holes are formed by matching a horizontal plate and an arc plate, and the direction of the airflow blown out of the nail holes is similar to the horizontal flow direction under the blocking effect of the arc plate.
Referring to fig. 2 and 4, the horizontal direction from the primary drying section to the cooling section of the horizontal multi-chamber fluidized bed dryer 02 is the material moving direction.
Referring to fig. 4, the opening direction of the nail holes is set in two ways on the gas distribution plate 02-10, the included angles between the two air flow directions blown out from the nail holes and the upper and lower sides of the material moving direction are respectively alpha and beta, and the included angles are respectively marked as alpha-type nail holes and beta-type nail holes; the alpha nail holes and the beta nail holes are alternately arranged on the air distribution plate 02-10 and are distributed on the whole air distribution plate, and the range of the alpha or the beta is 0 to 180 degrees, preferably 90 to 180 degrees, and more preferably 120 to 150 degrees.
The opening ratio of the gas distribution plate 02-10 is 1 to 15 percent, preferably 2 to 8 percent; the alpha-type nail holes and the beta-type nail holes are arranged on the gas distribution plate 02-10 in rows, the moving direction of the material is marked as the transverse direction, and each row of the alpha-type nail holes and each row of the beta-type nail holes are arranged longitudinally.
Referring to fig. 6, the row of α -type nails is designated as row a, the row of β -type nails is designated as row B, and the nails on the gas distribution plate may be arranged in two ways: 1. each row of alpha nail holes and each row of beta nail holes are alternately arranged on the gas distribution plate 02-10, such as the ABAB arrangement mode in FIG. 6; 2. every two rows of alpha nail holes and every two rows of beta nail holes are alternately arranged on the gas distribution plate 02-10, such as the AABB arrangement in fig. 6.
In the following examples, the drying apparatus of the present invention is used to dry materials with large particle size difference and high requirement for uniformity of moisture content of the product.
Example 1:
in a horizontal multi-chamber fluidized bed dryer with the specification of 700 multiplied by 100mm, in a structure adopting an air distribution plate, included angles between the direction of air flow blown out from nail holes and the upper side and the lower side of the moving direction of materials are respectively alpha and beta, and alpha = beta =150 degrees. The nail holes on the gas distribution plate are arranged in an ABAB mode, when the opening rate is 3%, the average residence time of particles with the detected particle size of 0.5-1.0 mm and 1.6-2.5 mm is 20.2min and 27.6min respectively.
A hot die experiment is carried out by using a molecular sieve, the height of a net bed is 80mm, the air inlet temperature is 150 ℃, and the fluidizing gas velocity is 1.16m/s. The initial water content of the wet material is 21.08 percent, the water content of the particles with the particle sizes of 0.5 to 1.0mm is 5.63 percent when the wet material is dried for 20.2min, the water content of the particles with the particle sizes of 1.6 to 2.5mm is 5.49 percent when the wet material is dried for 27.6min, and the water content of the material with large particle sizes in the product is basically the same as that of the material with small particle sizes.
Example 2:
in a horizontal multi-chamber fluidized bed dryer with the specification of 700 multiplied by 100mm, in a structure adopting a gas distribution plate, included angles between the direction of a gas flow blown out from nail holes and the upper side and the lower side of the moving direction of a material are respectively alpha and beta, and alpha = beta =30 degrees. The nail holes on the gas distribution plate are arranged in an ABAB mode, when the opening rate is 3%, the average residence time of particles with the detected particle size of 0.5-1.0 mm and 1.6-2.5 mm is 17.1min and 10.4min respectively.
A hot mould experiment is carried out by using a molecular sieve, the net bed height is 80mm, the air inlet temperature is 150 ℃, and the fluidizing gas velocity is 1.16m/s. The initial water content of the wet material is 21.08 percent, and the water content of the particles with the particle diameters of 1.6 to 2.5mm is 12.32 percent when the wet material is dried for 10.4 min; and (3) drying for 17.1min to obtain particles with the particle sizes of 0.5-1.0 mm, wherein the water content of the material with the large particle size in the product is 7.69%, and the water content of the material with the small particle size in the product is obviously higher than that of the material with the large particle size in the product.
Example 3:
a process flow diagram of a drying system for a material which is initially softened and bonded by heat is shown in fig. 7.
Wet materials are continuously fed into a first chamber of a horizontal multi-chamber fluidized bed dryer 02 through a spiral feeder 01, sequentially enter each chamber of a primary drying section, a drying section and a cooling section under the action of a drying medium, are fluidized, dried and cooled, then enter a dust separation system 02-9 to separate powder, are discharged from a product outlet 02-11, are discharged through a star-shaped discharging device 03, are screened by a screening machine 04, and are packaged and stored.
The drying medium is air and enters the horizontal multi-chamber fluidized bed dryer 02 through five paths, and one path is air for the drying rear section; the two paths are air for a cooling section and a dust separation system; the three paths are air for the lump crushing and separating system; the fourth way is air for the primary drying section; and the fifth path is circulating tail gas.
One path of air is filtered by a filter II 14, pressurized by a blower IV 15, and heat exchanged by a heat exchanger III 16 to the required temperature, and then is sent to the rear section of the horizontal multi-chamber fluidized bed dryer 02 for drying, the material is fluidized and dried at the rear section, and the dried tail gas is discharged from a tail gas outlet I02-5 and a tail gas outlet II 02-7.
Two paths of air are filtered by a filter III 17 and pressurized by a blower V18 and then divided into two paths, one path of air is sent to a cooling section of a horizontal multi-chamber fluidized bed dryer 02 to fluidize and cool the materials, and cooled tail gas is discharged from a tail gas outlet II 02-7; and the other strand is dehumidified by a dehumidifier 19, then is sent into a dust separation system 02-9 to fluidize and separate dust of the materials, and then is discharged from a tail gas outlet III 02-8.
The three paths of air are filtered by a filter I06, pressurized by a blower I07 and divided into two paths, one path of air is sent into a fluidization area of a lump crushing and separating system 05 through an air inlet II 05-5, materials with small grain sizes are sent back to a horizontal multi-chamber fluidized bed dryer 02, the other path of air is sent into a crushing area of the lump crushing and separating system 05 through an air inlet I05-2, materials with qualified grain sizes are sent back into the horizontal multi-chamber fluidized bed dryer 02 and then discharged from a tail gas outlet I02-5, and after dust is removed by a bag-type dust remover II 21, the materials are discharged into the atmosphere through a draught fan 22.
The four paths of air are directly fed into the air, filtered by a middle-high efficiency filter I08, pressurized by a blower II 09 and subjected to heat exchange by a heat exchanger I10, the temperature of the air after heat exchange is 0-normal temperature, the air is fed into a primary drying section of a horizontal multi-chamber fluidized bed dryer 02 to fluidize wet materials and remove surface moisture, then the air is crushed with block masses to separate system tail gas, the tail gas is discharged from a tail gas outlet I02-5, and the tail gas is discharged into the air through a draught fan 22 after dust removal by a bag-type dust remover II 21.
And five paths are circulating tail gas, high-temperature low-humidity tail gas discharged from a tail gas outlet II 02-7 and a tail gas outlet III 02-8 of the horizontal multi-chamber fluidized bed dryer is subjected to dust removal by a bag-type dust remover I20, filtering by a middle-high efficiency filter II 11, pressurizing by an air blower III 12 and heating by a heat exchanger II 13, is sent to the front section of the horizontal multi-chamber fluidized bed dryer 02 for drying, is subjected to fluidization, heating and drying, and is discharged from a tail gas outlet I02-5 and a tail gas outlet II 02-7 after drying.
The lumps generated in the wet material drying process are discharged from an agglomerate outlet 02-4 of the horizontal multi-chamber fluidized bed dryer 02 under the action of air flow of an air distribution plate 02-10 with a special structure, enter an agglomerate crushing and separating system 05, entrained materials with qualified granularity are sent back to the horizontal multi-chamber fluidized bed dryer 02 from a material return port 02-2 under the action of air flow, and the agglomerated materials are discharged from a large lump material outlet 05-6 and are correspondingly treated.
The dried and cooled materials enter a dust separation system 02-9, are fluidized, continuously cooled and separated from dust under the action of air flow, enter a hopper 02-12 from a product outlet 02-11 of a horizontal multi-chamber fluidized bed dryer 02, are fed into a screening machine 04 by a star-shaped discharging device 03 for screening, and are screened and packaged according to the requirements of product specifications. And dust in the materials is discharged from a tail gas outlet III 02-8 of the fluidized bed along with airflow, collected by a bag-type dust collector I20 and treated additionally.
Example 4:
the process flow chart of the drying uniformity of the product with the coarse and fine particles of the common material is shown in figure 8.
Wet materials are continuously fed into a first chamber of a horizontal multi-chamber fluidized bed dryer 02 through a spiral feeder 01, sequentially enter each chamber of a primary drying section, a drying section and a cooling section under the action of a drying medium, are fluidized, dried and cooled, then enter a dust separation system 02-9 to separate powder, are discharged from a product outlet 02-11, are discharged through a star-shaped discharging device 03, are screened by a screening machine 04, and are packaged and stored.
The drying medium is air, and enters the horizontal multi-chamber fluidized bed dryer 02 in five paths, and one path is air for the drying rear section; the two paths are air for a cooling section and a dust separation system; the three paths are air for the lump crushing and separating system; the four ways and the five ways are circulating tail gas.
One path of air is filtered by a filter II 14, pressurized by a blower IV 15, and heat exchanged by a heat exchanger III 16 to the required temperature, and then is sent to the rear section of the horizontal multi-chamber fluidized bed dryer 02 for drying, the material is fluidized and dried at the rear section, and the dried tail gas is discharged from a tail gas outlet I02-5 and a tail gas outlet II 02-7.
Two paths of air are filtered by a filter III 17 and pressurized by a blower V18 and then divided into two paths, one path of air is sent to a cooling section of a horizontal multi-chamber fluidized bed dryer 02 to fluidize and cool the materials, and cooled tail gas is discharged from a tail gas outlet II 02-7; and the other strand is dehumidified by a dehumidifier 19, then is sent into a dust separation system 02-9 to fluidize and separate dust of the materials, and is discharged from a tail gas outlet III 02-8.
The three paths of air are filtered by a filter I06, pressurized by a blower I07 and divided into two paths, one path of air is sent into a fluidization area of a lump crushing and separating system 05 through an air inlet II 05-5, materials with small grain sizes are sent back to a horizontal multi-chamber fluidized bed dryer 02, the other path of air is sent into a crushing area of the lump crushing and separating system 05 through an air inlet I05-2, materials with qualified grain sizes are sent back into the horizontal multi-chamber fluidized bed dryer 02 and then discharged from a tail gas outlet I02-5, and after dust is removed by a bag-type dust remover II 21, the materials are discharged into the atmosphere through a draught fan 22.
The four paths and the five paths are circulating tail gas, high-temperature low-humidity tail gas discharged from a tail gas outlet II 02-7 and a tail gas outlet III 02-8 of the horizontal multi-chamber fluidized bed dryer is dedusted by a bag-type deduster I20 and then divided into two paths, one path is filtered by a middle-high efficiency filter I08, pressurized by a blower II 09, heat exchanged by a heat exchanger I10 to the required temperature and then sent to a primary drying section of the horizontal multi-chamber fluidized bed dryer 02, and wet parts on the surface of the wet material are fluidized and removed; the other path is filtered by a middle-high efficiency filter II 11, pressurized by a blower III 12 and heated by a heat exchanger II 13, then is sent to a horizontal multi-chamber fluidized bed dryer 02 for drying at the front section, is fluidized, heated and dried, then is discharged from a tail gas outlet I02-5, and is discharged into the atmosphere through a draught fan 22 after being dedusted by a bag-type deduster II 21.
Under the action of air flow of an air distribution plate 02-10 with a special structure, lumps generated in the drying process of wet materials are discharged from a lump outlet 02-4 of a horizontal multi-chamber fluidized bed dryer 02 and enter a lump crushing and separating system 05, under the action of the air flow, the materials with qualified particle sizes are sent back to the horizontal multi-chamber fluidized bed dryer 02 from a material return port 02-2, the lump materials enter a crushing zone and are crushed by a high-speed rotating scattering rake 05-1, the crushed materials with qualified particle sizes are sent back to the horizontal multi-chamber fluidized bed dryer 02 from the material return port 02-2 along with the air flow to be continuously fluidized, dried, cooled and separated from dust, and the uncrushed lumps are discharged from a large lump material outlet 05-6 to be correspondingly processed.
The dried and cooled materials enter a dust separation system 02-9, are fluidized, continuously cooled and separated from dust under the action of air flow, enter a hopper 02-12 from a product outlet 02-11 of a horizontal multi-chamber fluidized bed dryer 02, are fed into a sieving machine 04 by a star-shaped discharging device 03 for sieving and are packaged according to the requirements of product specifications. And dust in the material is discharged from a tail gas outlet III 02-8 of the fluidized bed along with the airflow, collected by a bag-type dust collector I20 and treated additionally.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.
Claims (11)
1. The drying equipment is suitable for materials with large particle size difference and high requirement on the uniformity of moisture content of products, and is characterized by comprising a spiral feeder (01), a horizontal multi-chamber fluidized bed dryer (02), a star-shaped discharging device (03), a screening machine (04) and a lump crushing and separating system (05), wherein the horizontal multi-chamber fluidized bed dryer (02) comprises a primary drying section, a cooling section and a dust separating system (02-9) which are sequentially arranged, a material inlet (02-1) is formed in the primary drying section, and the material inlet (02-1) is directly connected with the spiral feeder (01) through a pipeline; a product outlet (02-11) is arranged on the dust separation system (02-9), materials in the dust separation system (02-9) can enter the hopper (02-12) through the product outlet (02-11), and the outlet of the hopper (02-12) is connected with the sieving machine (04) through the star-shaped discharger (03);
the lump crushing and separating system (05) is in butt joint with one side of the primary drying section, a lump outlet (02-4) and a material returning port (02-2) are respectively arranged at the lower end and the upper end of the joint of the primary drying section and the lump crushing and separating system (05), lumps generated in the drying process in the primary drying section can be discharged from the lump outlet (02-4) and enter the lump crushing and separating system (05), and small-particle materials in the lump crushing and separating system (05) can reenter the primary drying section through the material returning port (02-2) under the action of airflow of a drying medium;
the top of the horizontal multi-chamber fluidized bed dryer (02) is provided with a tail gas outlet I (02-5), a tail gas outlet II (02-7) and a tail gas outlet III (02-8), and the drying section of the horizontal multi-chamber fluidized bed dryer (02) is divided into a drying front section and a drying rear section; the tail gas outlet I (02-5) is arranged above the primary drying section and the drying front section, the tail gas outlet II (02-7) is arranged above the drying rear section and the cooling section, and the tail gas outlet III (02-8) is arranged at the top of the dust separation system (02-9); the tail gas outlet I (02-5) is connected with a bag-type dust collector II (21) and an induced draft fan (22) through a pipeline, the tail gas outlet II (02-7) and the tail gas outlet III (02-8) are both connected with an air inlet of the bag-type dust collector I (20) through pipelines, and an air outlet of the bag-type dust collector I (20) discharges circulating tail gas;
a whole block of gas distribution plate (02-10) is arranged in the horizontal multi-chamber fluidized bed dryer (02); a plurality of nail holes are formed in the gas distribution plate (02-10), the nail holes are formed by matching a horizontal plate and an arc plate, and the direction of gas flow blown out of the nail holes is similar to the horizontal flow direction under the blocking effect of the arc plate;
the horizontal direction from the primary drying section to the cooling section of the horizontal multi-chamber fluidized bed dryer (02) is the material moving direction;
the opening directions of the nail holes are set to be two modes on the gas distribution plate (02-10), the included angles between the directions of the two air flows blown out of the nail holes and the upper side and the lower side of the moving direction of the material are respectively alpha and beta, and the included angles are respectively marked as alpha-type nail holes and beta-type nail holes; the alpha type nail holes and the beta type nail holes are alternately arranged on the gas distribution plate (02-10) and are distributed on the whole gas distribution plate, and the range of alpha or beta is 120 to 150 degrees;
the briquette crushing and separating system (05) is divided into a fluidizing area and a crushing area, a sieve plate (05-4) which inclines downwards is arranged in the fluidizing area, an air inlet II (05-5) is arranged at the bottom of the fluidizing area, and the air inlet II (05-5) is used for introducing gas separated before briquette crushing; a breaking-up harrow (05-1) for breaking the lumps is arranged in the breaking area, and the breaking-up harrow (05-1) is connected with a motor (05-3) for driving the breaking-up harrow to rotate; both sides of the lower end of the crushing area are respectively provided with an air inlet I (05-2) and a bulk material outlet (05-6), the air inlet I (05-2) is used for introducing gas separated after the block mass is crushed, and the bulk material outlet (05-6) is used for discharging the crushed block mass; the included angle between the sieve plate (05-4) and the horizontal direction is 15 to 45 degrees.
2. The drying equipment for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the products as claimed in claim 1, characterized in that the part of the horizontal multi-chamber fluidized bed dryer (02) below the gas distribution plate (02-10) is provided with air inlet chambers, and a corresponding drying medium is introduced into each air inlet chamber;
the horizontal multi-chamber fluidized bed dryer (02) is internally provided with a plurality of partition plates (02-6), the partition plates (02-6) divide the horizontal multi-chamber fluidized bed dryer (02) into five parts, namely a primary drying section, a drying front section, a drying rear section, a cooling section and a dust separation system (02-9), the height of the partition plates (02-6) is 30 to 100cm, and the distance from the lower ends of the partition plates to a gas distribution plate is 3 to 20cm, so that the partition plates are used for material flow channels.
3. The drying equipment suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 1, wherein the dust separation system (02-9) is composed of a straight separation cavity with a tubular structure and a conical tapered cavity arranged at the top of the straight separation cavity, the height of the straight separation cavity is 1.5-2 times of the height of a cooling section of the multi-chamber horizontal fluidized bed dryer (02) so as to ensure the separation of the materials and the dust, and the conical tapered cavity is arranged above the straight separation cavity so as to ensure the separated dust to be discharged outwards in time; the opening width of the lump outlet (02-4) is 0.5-1 time of the width of a primary drying section of the horizontal multi-chamber fluidized bed dryer (02), the opening height of the lump outlet (02-4) is 3-10cm, an electric control small door (02-3) matched with the opening size is arranged on the lump outlet (02-4), the opening interval duration of the electric control small door (02-3) and the duration of each opening can be controlled by a PLC control system, the opening is started once every 1-20 minutes and is automatically closed after 5-20 seconds.
4. The drying equipment for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 1, characterized in that the shape of the gas distribution plate (02-10) is rectangular, which is matched with the length and width of the upper and lower bed bodies of the horizontal multi-chamber fluidized bed dryer (02) and is arranged between the upper and lower bed bodies of the horizontal multi-chamber fluidized bed dryer (02).
5. The drying equipment suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 1, wherein the aperture ratio of the gas distribution plate (02-10) is 1 to 15%; the alpha-type nail holes and the beta-type nail holes are arranged on the gas distribution plate (02-10) in rows, the moving direction of the material is marked as the transverse direction, and each row of alpha-type nail holes and each row of beta-type nail holes are arranged longitudinally.
6. The drying equipment suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 5, wherein the aperture ratio of the gas distribution plate (02-10) is 2 to 8%.
7. The drying apparatus for material with large particle size difference and high requirement for moisture content uniformity of product as claimed in claim 1, wherein each row of α -type nail holes and each row of β -type nail holes are alternately arranged on the gas distribution plate (02-10), or each row of α -type nail holes and each row of β -type nail holes are alternately arranged on the gas distribution plate (02-10).
8. A drying process suitable for materials with large particle size difference and high requirement on the uniformity of moisture content of products is characterized by comprising the following steps of:
1) And (3) material drying and cooling process:
wet materials are fed into a first chamber of a horizontal multi-chamber fluidized bed dryer (02) through a spiral feeder (01), sequentially enter a primary drying section, a drying section and a cooling section of the horizontal multi-chamber fluidized bed dryer (02) to be respectively fluidized, dried and cooled under the action of a drying medium introduced into the horizontal multi-chamber fluidized bed dryer (02), and then enter a dust separation system (02-9) to separate powder, the dried product is discharged from a product outlet (02-11) of the dust separation system (02-9), discharged through a star-shaped discharger (03), and packaged and stored after being screened by a screening machine (04);
2) Drying medium-partial tail gas recycle process:
the drying section of the horizontal multi-chamber fluidized bed dryer (02) is divided into a drying front section and a drying rear section;
the drying medium is air, and enters a horizontal multi-chamber fluidized bed dryer (02) in five paths, wherein the first path is air for the drying rear section; the second path is air for a cooling section and a dust separation system; the third path is air for the lump crushing and separating system; the fourth way is air for the primary drying section; the fifth path is circulating tail gas;
the first path of air is filtered by a filter II (14), pressurized by a blower IV (15) and heat exchanged by a heat exchanger III (16) in sequence to reach the required temperature and then is sent to the drying rear section of the horizontal multi-chamber fluidized bed dryer (02) to fluidize and dry the material at the rear section, and the dried tail gas is discharged from a tail gas outlet I (02-5) and a tail gas outlet II (02-7) at the top of the horizontal multi-chamber fluidized bed dryer (02);
the second path of air is filtered by a filter III (17) and pressurized by a blower V (18) and then divided into two paths, one path of air is sent to a cooling section of the horizontal multi-chamber fluidized bed dryer (02) to fluidize and cool the materials, and the cooled tail gas is discharged from a tail gas outlet II (02-7) at the top of the horizontal multi-chamber fluidized bed dryer (02); the other strand is dehumidified by a dehumidifier (19), then is sent into a dust separation system (02-9), is fluidized and separated from dust, and is discharged from a tail gas outlet III (02-8) at the top of the dust separation system (02-9);
the third path of air is filtered by a filter I (06), pressurized by a blower I (07) and divided into two paths, one path of air is sent into a fluidization area of a lump crushing and separating system (05), and the small-particle-size materials are sent back into a horizontal multi-chamber fluidized bed dryer (02); the other strand is sent into a crushing area of a lump crushing and separating system (05), and the material with qualified granularity after crushing is sent back into the horizontal multi-chamber fluidized bed dryer (02) and then is discharged from a tail gas outlet I (02-5) at the top of the horizontal multi-chamber fluidized bed dryer (02);
the fourth path of air is filtered by a middle-high efficiency filter I (08), pressurized by a blower II (09), and subjected to heat exchange by a heat exchanger I (10) to reach the required temperature, and then is sent to a primary drying section of the horizontal multi-chamber fluidized bed dryer (02), the wet material is fluidized, the surface moisture is removed, and then the wet material is discharged from a tail gas outlet I (02-5) at the top of the horizontal multi-chamber fluidized bed dryer (02);
the fifth path of air is circulating tail gas, the circulating tail gas is filtered by a middle-high-efficiency filter II (11), pressurized by a blower III (12) and heated by a heat exchanger II (13), then is sent to the front drying section of the horizontal multi-chamber fluidized bed dryer (02) for fluidization, heating and drying, and the dried tail gas is discharged from a tail gas outlet I (02-5) and a tail gas outlet II (02-7) at the top of the horizontal multi-chamber fluidized bed dryer (02);
tail gas discharged from a tail gas outlet I (02-5) at the top of the horizontal multi-chamber fluidized bed dryer (02) is dedusted by a bag deduster II (21) and is exhausted outwards by an induced draft fan (22); tail gas discharged from a tail gas outlet II (02-7) at the top of the horizontal multi-chamber fluidized bed dryer (02) is combined with tail gas discharged from a tail gas outlet III (02-8) at the top of the dust separation system (02-9), and then dust is removed by a bag-type dust remover I (20), so that the circulating tail gas is formed;
3) The process of crushing and separating the lumps comprises the following steps:
the briquette generated in the drying process in the primary drying section of the horizontal multi-chamber fluidized bed dryer (02) can be discharged from a briquette outlet (02-4) of the horizontal multi-chamber fluidized bed dryer (02) and enters a fluidizing zone of a briquette crushing and separating system (05), under the action of air flow of a drying medium, the entrained material with qualified granularity is delivered back to the horizontal multi-chamber fluidized bed dryer (02) from a material return port (02-2) of the horizontal multi-chamber fluidized bed dryer (02), the rest briquette material continues to enter a crushing zone of the briquette crushing and separating system (05) for crushing, and the crushed material with qualified granularity is carried by the introduced drying medium and is delivered back to the horizontal multi-chamber fluidized bed dryer (02) for continuous fluidization and surface moisture removal;
4) And (3) dust separation process:
the method comprises the following steps that materials dried and cooled in a cooling section of a horizontal multi-chamber fluidized bed dryer (02) enter a dust separation system (02-9), are fluidized, continuously cooled and separated from dust under the action of air flow of a drying medium, enter a hopper (02-12) from a product outlet (02-11) of the horizontal multi-chamber fluidized bed dryer (02), are fed into a sieving machine (04) through a star-shaped discharging device (03) for sieving, and are sieved and packaged according to the requirements of product specifications; and dust in the materials is discharged from a tail gas outlet III (02-8) at the top of the dust separation system (02-9) along with the air flow, and is separated and collected by a bag-type dust remover I (20).
9. The drying process of the material with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 8, characterized in that in the primary drying section, the front drying section, the rear drying section and the cooling section of the horizontal multi-chamber fluidized bed dryer (02), the air inlet temperature of the primary drying section is 0-160 ℃, and the air inlet temperature of the front drying section is 80-160 ℃; the air inlet temperature of the drying rear section is 80-200 ℃; the air inlet temperature of the front drying section is lower than that of the rear drying section; the air inlet temperature of the cooling section is normal temperature; the air inlet temperature of the dust separation system (02-9) is 0-normal temperature.
10. The process for drying the material with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 9, wherein the inlet air temperature of the front drying stage is 80 to 120 ℃; the air inlet temperature of the drying rear section is 100 to 160 ℃.
11. The drying process suitable for the materials with large particle size difference and high requirement on the uniformity of the moisture content of the product as claimed in claim 8, wherein when the wet materials are heat-resistant common materials, the circulating tail gas is divided into two parts, one part is used as the fourth air, and the other part is used as the fifth air; when the wet material is a heat-instable material which is easy to soften and bond under heat, the fourth way of air is selected from normal-temperature air, and the heat-instable material is preferably one of honey and vitamin D3.
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| CN114198986B (en) * | 2022-01-13 | 2024-07-12 | 北京蓝鼎科创装备科技有限公司 | Circulating fluidized bed |
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| CN203940691U (en) * | 2014-06-10 | 2014-11-12 | 浙江工业大学 | Partial tail gas recirculating fluidized bed drying equipment |
| CN204122068U (en) * | 2014-07-17 | 2015-01-28 | 上海森松制药设备工程有限公司 | A kind of fluid bed multifunctional gas distribution grid |
| JP2017166740A (en) * | 2016-03-16 | 2017-09-21 | 株式会社Ihi | Drying system and activation method of drying system |
| CN106288659A (en) * | 2016-08-26 | 2017-01-04 | 佛山市新太重工机械设备有限公司 | A kind of hot blast stove system |
| CN109007726A (en) * | 2018-08-30 | 2018-12-18 | 浙江工业大学 | A kind of solid bee honey preparation process and evenly drying equipment |
| CN210207150U (en) * | 2019-06-28 | 2020-03-31 | 山东金孚环境工程有限公司 | Boiler ash automatic drying breaker |
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