CN110986507A - Silicon carbide biscuit drying device and application - Google Patents
Silicon carbide biscuit drying device and application Download PDFInfo
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- CN110986507A CN110986507A CN201911309199.5A CN201911309199A CN110986507A CN 110986507 A CN110986507 A CN 110986507A CN 201911309199 A CN201911309199 A CN 201911309199A CN 110986507 A CN110986507 A CN 110986507A
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- 238000001035 drying Methods 0.000 title claims abstract description 157
- 235000015895 biscuits Nutrition 0.000 title claims abstract description 87
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 86
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000005485 electric heating Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000007602 hot air drying Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
- F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/248—Supports for drying
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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
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
-
- 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
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
- F26B25/185—Spacers; Elements for supporting the goods to be dried, i.e. positioned in-between the goods to build a ventilated stack
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a silicon carbide biscuit drying device and application thereof, which are used for drying a silicon carbide biscuit placed in a drying chamber and comprise a heat pump unit, a circulating air duct unit and a fan unit, wherein the heat pump unit is arranged above the outside of the drying chamber, and the circulating air duct unit and the fan unit are vertically arranged in the drying chamber; the heat pump unit is used for converting the hot and humid air flowing through the silicon carbide biscuit in the drying chamber into liquid, and then releasing heat to heat the air entering the drying chamber again; the circulating air channel unit is used for shunting the air in the drying chamber; the fan unit is used for driving airflow to dry the silicon carbide biscuit. The airflow sequentially passes through the fan unit, the circulating air duct unit and the heat pump unit and then returns to the fan unit to form circulating hot air, and the silicon carbide biscuit is dried. The device has simple structure, saves energy, realizes quick, low-energy consumption and high-quality drying, and has accurate size, controllable shape and roundness; the density of the biscuit is higher; the overall uniformity of the product is high.
Description
Technical Field
The invention belongs to the field of new material drying, and particularly relates to a silicon carbide biscuit drying device and application thereof.
Background
The extrusion reaction sintering silicon carbide ceramic plays an important role in more and more fields in China, the reaction sintering silicon carbide ceramic has 3 molding modes, including extrusion molding, slip casting and compression molding, the extrusion molding cost is low, the yield is high, so the extrusion molding is widely used in the industry, and the common types of the reaction sintering silicon carbide ceramic are roller rod type, square beam type and plate type. The drying mode is an important link in the production and manufacturing process of the extrusion molding reaction sintering silicon carbide.
At present, the drying modes in the industry include microwave drying and electric heating drying. The electric heating drying has the advantages of low cost and easy maintenance, but has the abnormal phenomena of deformation, layered foaming, cracking and the like after biscuit drying, which cause material waste, because the temperature is not controlled and is too high. The drying room is high in efficiency when microwave drying and electric heating drying are used, but biscuit shrinkage can be caused, the biscuit shrinkage is not dense, layering is caused due to uneven drying inside and outside, and the appearance and the size are not easy to control.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a silicon carbide biscuit drying device and application thereof, and solves the technical problems of low drying speed, uncontrollable temperature, uncontrollable appearance size and high energy consumption of the existing silicon carbide biscuit drying.
In order to achieve the purpose, the invention adopts the following technical scheme:
a silicon carbide biscuit drying device is used for drying silicon carbide biscuits placed in a drying chamber and is characterized by comprising a heat pump unit, a circulating air duct unit and a fan unit, wherein the heat pump unit is arranged above the outside of the drying chamber, the circulating air duct unit and the fan unit are vertically arranged in the drying chamber,
the heat pump unit is used for converting the hot and humid air flowing through the silicon carbide biscuit in the drying chamber into liquid, and then releasing heat to heat the air entering the drying chamber again;
the circulating air channel unit is used for shunting gas in the drying chamber; the circulating air channel unit comprises a baffle plate which is arranged in the drying chamber in the horizontal direction, the drying chamber is divided into a first air channel and a second air channel which are opposite in air flow direction, a first air return opening is arranged between one end of the baffle plate and the inner wall of the drying chamber, and a second air return opening is arranged on the other end plate of the baffle plate;
the fan unit is used for driving hot air to sequentially pass through the first air duct, the first air return opening, the second air duct, the heat pump unit and the second air return opening and then return to the fan unit to form circulating hot air, and the silicon carbide biscuit arranged in the drying chamber and close to the first air return opening is dried.
Further, the height ratio of the first air duct to the second air duct is 3-4: 1, and the air flow ratio of the first air return opening to the second air return opening is 1: 1;
the baffle can be dismantled and fix on the drying chamber inner wall, the second return air inlet be used for dispelling the heat with the air current in the drying chamber and the hot gas flow that flows out through heat pump unit.
The fan unit comprises a fan support, a fan and a heating plate, the fan is arranged on the fan support, the heating plate is arranged on the inner wall of a drying chamber located at the rear end of the fan, the fan support is vertically arranged below the baffle plate, a first air channel is divided into an area b and an area c, the volume ratio of the area b to the area c is 5-6: 1, and the silicon carbide biscuit is placed in the center of the area b.
Further, the drying chamber in set up the frock frame, be provided with the frock that is used for the carborundum biscuit placed on the frock frame, the quantity of frock be a plurality of.
The tool comprises two plates, the included angle of the two plates is 60-125 degrees, 2 through holes are formed in each plate, the through holes are used for circulating air flow in the drying chamber, and the arrangement direction of the through holes is parallel to the direction of the air flow blown out by the fan;
and a plurality of pores which are mutually and vertically communicated with the through holes are arranged on the surface of the plate, and the silicon carbide biscuit is dried by the airflow passing through the through holes through the pores.
The surface of the plate is provided with a plurality of holes, and the inside of the plate is provided with through holes.
Specifically, the number of the fans is 9.
Furthermore, a door capable of being opened movably is arranged outside the drying chamber.
Furthermore, the heat pump unit is internally and externally connected with an evaporator, a compressor, a condenser and a throttling device are arranged in the heat pump unit, heat in the damp and hot air discharged by the drying chamber is absorbed in the evaporator, the damp and hot air is pressurized by the compressor to become high-temperature and high-pressure steam, the heat is released by the condenser to heat the air entering the drying chamber, the steam becomes low-pressure and low-temperature liquid through the throttling device, the low-pressure and high-pressure liquid enters the evaporator again to absorb heat of the damp and hot air, and the cycle is repeated.
The silicon carbide biscuit drying device is used for drying a silicon carbide biscuit, the silicon carbide biscuit obtained by drying the silicon carbide biscuit comprises a roller rod type silicon carbide biscuit and a square beam silicon carbide biscuit, the roundness difference value of the roller rod type silicon carbide biscuit is 0.19-0.22 mm, and the density is 2.18-2.3 g/m3。
Compared with the prior art, the invention has the following beneficial effects:
(1) the drying efficiency is high, the drying device of the silicon carbide biscuit can be completely dried only in 12 hours, the water content is less than 0.5 percent, and the efficiency is improved.
(2) Energy saving
The heating temperature of the traditional electric heating plate is about 100 ℃, the traditional electric heating plate is uncontrollable, compared with the traditional electric heating plate heating mode, due to the fact that circulating air is added, the temperature is relatively low, drying is rapid and uniform, energy is saved by about 70-80%, and compared with the microwave drying mode, the energy is saved by about 40-50%.
(3) The quality of the dried product is good
The evaporation speed of the surface moisture is closer to the migration speed of the internal moisture to the surface, so that the whole biscuit is dried more uniformly and consistently, the phenomena of abnormal conditions caused by non-uniform drying, such as layered cracking, air bubbles and the like, are reduced, and the finally dried product is uniform and compact.
In the drying process caused by microwave drying, the biscuit is easy to expand, so that the finally dried product is loose and not compact, the drying device can realize uniform and controllable drying, uniform, consistent and rapid drying is carried out under the conditions of constant temperature and constant humidity, and finally, the obtained product has accurate size and controllable shape and roundness; the density of the biscuit is higher; the overall uniformity of the product is high.
(4) The drying device has simple structure.
Drawings
FIG. 1 is a schematic structural view of a side view of a silicon carbide biscuit drying device;
FIG. 2 is a front view of a silicon carbide biscuit drying apparatus;
FIG. 3 is a schematic structural view of a top view of a silicon carbide biscuit drying apparatus;
FIG. 4 is a schematic perspective view of a silicon carbide biscuit drying apparatus;
FIG. 5 is a perspective view of the tooling structure;
FIG. 6 is a side view of the tooling structure
FIG. 7 is a schematic diagram of the construction of the heat pump unit;
fig. 8 is a comparison of the finished product after drying the silicon carbide green body by using the silicon carbide green body drying apparatus.
The reference numerals in the figures denote:
1. a drying chamber; 2. a heat pump unit; 3. a circulating air duct unit; 31. a second air duct; 32. a baffle plate; 33. a second air return inlet; 34. a first air duct; 35. a first air return opening; 4. a fan unit; 41. a fan bracket; 42 a fan; 43. heating plates; 5. a tool rack; 51. a pore; 52. a through hole; 6. and a door.
The invention is described in detail below with reference to the drawings and the detailed description.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
The silicon carbide biscuit drying device comprises a heat pump unit and a hot air drying circulating unit, wherein the heat pump unit provides a high-temperature heat source for the hot air drying circulating unit (comprising a circulating air duct unit 3 and a fan unit 4), reduces the humidity of hot air, supplements lost heat for a system, and the hot air drying circulating unit is in direct contact with materials through circulating hot air to provide heat for evaporating water and take away water in the materials. Compared with the common drying process, the method has the advantages that no damp and hot gas is discharged, and the moisture in the material is finally discharged as liquid water. The principle has two advantages:
(1) energy conservation: in heat pump drying. Sensible heat and latent heat of the humid heat gas are recovered without discharging the humid heat gas, partial heat loss is supplemented by solar energy, and only certain mechanical work is consumed.
(2) No environmental pollution: because the heat pump drying is carried out in a closed environment, no toxic and harmful gas is generated in the drying process, and the pollution to the surrounding environment can be reduced to the lowest.
The device is adopted in the field of drying the silicon carbide biscuit for the first time, the drying efficiency is high, the silicon carbide biscuit drying device can be completely dried in 12 hours, the water content is less than 0.5%, and the efficiency is improved.
The energy is saved by about 70-80% compared with the traditional electric heating plate heating mode, and by about 40-50% compared with the microwave drying mode. The drying device can realize uniform and controllable drying, and can perform uniform, consistent and rapid drying under the conditions of constant temperature and constant humidity, so that the obtained product has accurate size and controllable shape and roundness; the density of the biscuit is higher; the overall uniformity of the product is high.
Example 1
The embodiment provides a silicon carbide biscuit drying device, which is used for drying a silicon carbide biscuit placed in a drying chamber 1 and comprises a heat pump unit 2, a circulating air duct unit 3 and a fan unit 4, wherein the heat pump unit 2 is arranged above the outside of the drying chamber 1, and the circulating air duct unit 3 and the fan unit 4 are vertically arranged in the drying chamber 1;
the heat pump unit 2 is used for converting the damp and hot air flowing through the silicon carbide biscuit in the drying chamber 1 into liquid, further releasing heat to heat the air entering the drying chamber 1 again, and the circulating air channel unit 3 is used for shunting the gas in the drying chamber 1;
the circulating air channel unit 3 comprises a baffle 32 arranged in the drying chamber 1 in the horizontal direction, and divides the drying chamber 1 into a first air channel 34 and a second air channel 31 with opposite air flow directions, wherein a first air return opening 35 is arranged between one end of the baffle 32 and the inner wall of the drying chamber 1, and a second air return opening 33 is arranged on the other end plate of the baffle 32;
the fan unit 4 is used for driving hot air to sequentially pass through the first air duct 34, the first air return opening 35, the second air duct 31, the heat pump unit 2 and the second air return opening 33 and then return to the fan unit 4 to form circulating hot air, and drying the silicon carbide biscuit arranged in the drying chamber 1 and close to the first air return opening 35.
The height ratio of the first air duct 34 to the second air duct 31 is 3-4: 1, for example, the height of the space where the first air duct 34 is located is 180-190 cm, the height of the space a where the second air duct 31 is located is 50-60 cm, and the ratio of the air flow passing through the first air return opening 35 and the second air return opening 33 is 1: 1;
the baffle 32 is detachably fixed on the inner wall of the drying chamber 1, and the second air return opening 33 is used for dissipating heat of the air flow in the drying chamber 1 and the hot air flow flowing out through the heat pump unit 2. The second return air opening 33 is located obliquely below the heat pump unit 2.
The fan unit 4 comprises a fan support 41, a fan 42 and a heating plate 43, wherein the fan 42 is arranged on the fan support 41, and the heating plate 43 is arranged on the inner wall of the drying chamber 1 at the rear end of the fan 42 and used as an auxiliary evaporator to guide and radiate hot air. The fan bracket 41 is vertically arranged below the baffle 32 and further plays a role in supporting the baffle 32; the first air duct 34 is divided into a region b and a region c, the volume ratio of the region b to the region c is 5-6: 1, for example, the length of the region b is 420cm, the length of the region c is 80cm, and a silicon carbide biscuit is placed in the center of the region b.
The number of fans 42 is 9, as shown in fig. 2, 3 rows and 3 columns. The fan is a circulating fan with the diameter of 50 cm. The distance between the indoor fan and the inner wall of the drying chamber is 20cm, and the distance between the indoor fan and the baffle 32 is also 20 cm.
Set up frock frame 5 in the drying chamber 1, the shape of frock frame 5 is "V" style of calligraphy, is 90, is provided with the frock that is used for the carborundum biscuit of placing on the frock frame 5, and the quantity of frock is a plurality of. The tool rack 5 should be placed in the middle of the area b, if the tool rack is too close to the door, the drying speed of the port of the silicon carbide biscuit becomes slow, and if the tool rack is too close to the fan, the forming of the silicon carbide biscuit is influenced, and cracks can be generated.
The frock includes two panels, and the contained angle theta of two panels is 60 ~ 120, and the frock includes two panels, and the contained angle of two panels is 60 ~ 125, and every panel is inside to set up 2 through-holes 52, and the inside air current that is used for the circulation drying chamber of through-hole 52, and the direction of setting up of through-hole 52 is parallel with the air current direction that the fan blew off. The technical cloth can be laid on the plate, the water absorption and ventilation effects are achieved, the plate can be made of aluminum alloy in order to enhance the strength of the tool, and the plate is high in strength, not prone to deformation, low in quality and convenient to operate. The height of the tool is 20cm, the length of the tool is 3-3.2 m, the tool is used in a superposition mode, and the tool is most required to be separated from the baffle 32 by 20cm for ventilation.
The surface of the plate is provided with a plurality of holes 51 which are vertical to and communicated with the through holes 52, the silicon carbide biscuit is dried by the airflow passing through the through holes 52 through the holes 51, and the silicon carbide biscuit is more uniformly dried by the arrangement of the holes 51 and the through holes 52, so that the silicon carbide biscuit can be axially dried by the through holes 52, and the silicon carbide biscuit can be radially dried by the plurality of holes 51 which are vertical to and communicated with the through holes 52. In addition, the tool is placed on the V-shaped tool frame 5, the stabilizing effect can be realized, the included angle theta of two plates of the tool is 60 degrees at the minimum and is smaller than 60 degrees, the included angle theta influences the roundness of the rod-shaped silicon carbide biscuit, therefore, the included angle theta is larger than 60 degrees, when the diameter of the rod-shaped silicon carbide biscuit is 50mm, the included angle theta is 120 degrees, the roundness difference of the rod-shaped silicon carbide biscuit is smaller, in addition, the design has better straightness of the silicon carbide biscuit, uniform, consistent and rapid drying is carried out under the conditions of constant temperature and constant humidity, and finally, the obtained product has accurate size, controllable shape and roundness; the overall uniformity of the product is high.
A door 6 that can be opened movably is provided outside the drying chamber 1. The shell of the drying chamber adopts a rock wool plate, so that heat is preserved and is not dissipated.
The heat pump unit 2 is externally connected with an evaporator, the evaporator can be arranged on the baffle 32 and is adjacent to the second air return opening 33, the connection between the heat pump unit 2 and the evaporator is conventional, a compressor, a condenser and a throttling device are arranged in the heat pump unit 2, heat in damp and hot air discharged from the drying chamber 1 is absorbed in the evaporator, the heat is pressurized by the compressor to become high-temperature and high-pressure steam, the heat is discharged by the condenser to heat the air entering the drying chamber 1, the air becomes low-pressure and low-temperature liquid through the throttling device, and the low-pressure and low-temperature liquid enters the evaporator again to absorb heat of the damp and hot air, and the cycle is.
Example 2
The embodiment also provides a silicon carbide biscuit drying device for drying the silicon carbide biscuit. And placing the silicon carbide biscuit on a tool frame for drying.
Biscuit type: the roller rods and the square beams are 4-10 mm thick; the outer aperture is phi 25-100 mm, the length is 0-5 mm, the drying temperature is 25-45 ℃, and the drying time is 1-6 h. And selecting the drying time and temperature according to the outer pore size and the thickness of different silicon carbide biscuit.
For example, drying can be accomplished by drying at 25 ℃ for 1h, heating to 30 ℃ for 3h, heating to 35 ℃ for 4h, heating to 40 ℃ for 8h, and heating to 45 ℃ for 6 h.
Assuming that the drying room for drying materials of the whole system is 36m3Total material is 600 kg/time, drying time is 24 hours, and baking room environment initial temperature: -10 ℃ to 25 ℃, and the drying temperature requirement is as follows: drying and dehydrating at 40-75 deg.C: 29 to 35 percent.
Therefore, the whole system dries the materials by 36m3Calculation of the effectiveness of the absorption by the silicon carbide biscuit drying apparatusThe heat Q is 331.5KW, only 3 degrees of electricity is consumed, and the current electric heating plate needs to consume at least 15 degrees for heating, drying and microwave drying the same material. The pre-drying is carried out for 24 hours, and then the high temperature drying is carried out for 24 hours.
Taking a roll-rod type silicon carbide biscuit as an example:
the traditional drying method is used for drying the roll-rod-shaped silicon carbide biscuit, the roundness difference of the roll rod shape is 0.66mm, and the roundness difference of the roll rod shape is 0.19-0.22 mm and can be reduced to 0.2mm when the device is used for drying the roll-rod-shaped silicon carbide biscuit.
The device of the invention is adopted to dry the roll-bar type silicon carbide biscuit, the density of the roll-bar type is uniform, and the density is maintained to be 2.18-2.3 g/m3In the meantime. The appearance and the appearance of the silicon carbide blank are compared with those of the attached drawings, and the silicon carbide blank obtained after drying is layered and foamed by adopting the existing drying mode.
Claims (9)
1. A silicon carbide biscuit drying device is used for drying silicon carbide biscuits placed in a drying chamber (1), and is characterized by comprising a heat pump unit (2), a circulating air duct unit (3) and a fan unit (4), wherein the heat pump unit (2) is arranged above the outside of the drying chamber (1), and the circulating air duct unit (3) and the fan unit (4) are vertically connected with each other and arranged in the drying chamber (1);
the heat pump unit (2) is used for converting the hot and humid air flowing through the silicon carbide biscuit in the drying chamber (1) into liquid, and further releasing heat to heat the air entering the drying chamber (1) again;
the circulating air channel unit (3) is used for shunting gas in the drying chamber (1); the circulating air channel unit (3) comprises a baffle plate (32) arranged in the drying chamber (1) in the horizontal direction, the drying chamber (1) is divided into a first air channel (34) and a second air channel (31) with opposite air flow directions, a first air return opening (35) is arranged between one end of the baffle plate (32) and the inner wall of the drying chamber (1), and a second air return opening (33) is arranged on the other end plate of the baffle plate (32);
the fan unit (4) is used for driving hot air to sequentially pass through the first air duct (34), the first air return opening (35), the second air duct (31), the heat pump unit (2) and the second air return opening (33) and then return to the fan unit (4) to form circulating hot air, and drying the silicon carbide biscuit arranged in the drying chamber (1) and close to the first air return opening (35).
2. The silicon carbide biscuit drying device according to claim 1, wherein the height ratio of the first air duct (34) to the second air duct (31) is 3-4: 1, and the air flow ratio of the first air return opening (35) to the second air return opening (33) is 1: 1;
the baffle (32) is detachably fixed on the inner wall of the drying chamber (1), and the second air return opening (33) is used for dissipating heat of air flow in the drying chamber (1) and hot air flow flowing out of the heat pump unit (2).
3. The silicon carbide biscuit drying device according to claim 2, wherein the fan unit (4) comprises a fan support (41), a fan (42) and a heating plate (43), the fan (42) is arranged on the fan support (41), the heating plate (43) is arranged on the inner wall of the drying chamber (1) at the rear end of the fan (42), the fan support (41) is vertically arranged below the baffle plate (32) and divides the first air duct (34) into a region b and a region c, the volume ratio of the region b to the region c is 5-6: 1, and the silicon carbide biscuit is placed in the center of the region b.
4. A silicon carbide biscuit drying device according to claim 3, characterized in that a tool holder (5) is arranged in the drying chamber (1), and tools for placing the silicon carbide biscuit are arranged on the tool holder (5), and the number of the tools is several.
5. The silicon carbide biscuit drying device according to claim 4, wherein the tool comprises two plates, the included angle between the two plates is 60-125 degrees, 2 through holes (52) are formed in each plate, the inside of each through hole (52) is used for circulating air flow in the drying chamber, and the arrangement direction of the through holes (52) is parallel to the air flow direction blown out by the fan (42);
the surface of the plate is provided with a plurality of pores (51) which are mutually and vertically communicated with the through holes (52), and the silicon carbide biscuit is dried by the airflow passing through the through holes (52) through the pores (51).
6. The silicon carbide biscuit drying apparatus of claim 1, wherein the number of fans (42) is 9.
7. Silicon carbide biscuit drying device according to claim 1, characterized in that the drying chamber (1) is externally provided with a door (6) that can be opened movably.
8. The silicon carbide biscuit drying device according to claim 1, wherein the heat pump unit (2) is internally and externally connected with an evaporator, a compressor, a condenser and a throttling device are arranged in the heat pump unit (2), the evaporator absorbs heat in damp and hot air discharged from the drying chamber (1), the heat is pressurized by the compressor to become high-temperature and high-pressure steam, the heat is released by the condenser to heat air entering the drying chamber (1), the air becomes low-pressure and low-temperature liquid through the throttling device, the air enters the evaporator again to absorb heat of the damp and hot air, and the circulation is carried out.
9. The silicon carbide biscuit drying device of any one of claims 1 to 8, wherein the silicon carbide biscuit obtained by drying the silicon carbide biscuit comprises a roller-shaped silicon carbide biscuit and a square-beam silicon carbide biscuit, the roundness difference of the roller-shaped silicon carbide biscuit is 0.19 to 0.22mm, and the density of the roller-shaped silicon carbide biscuit is 2.18 to 2.3g/m3。
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