CN114001525B - Efficient dehydration drying system and dehydration heat exchange equipment - Google Patents
Efficient dehydration drying system and dehydration heat exchange equipment Download PDFInfo
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- CN114001525B CN114001525B CN202111330856.1A CN202111330856A CN114001525B CN 114001525 B CN114001525 B CN 114001525B CN 202111330856 A CN202111330856 A CN 202111330856A CN 114001525 B CN114001525 B CN 114001525B
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- 230000018044 dehydration Effects 0.000 title claims abstract description 44
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 44
- 238000001035 drying Methods 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 223
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 238000009833 condensation Methods 0.000 claims abstract description 3
- 230000005494 condensation Effects 0.000 claims abstract description 3
- 239000011343 solid material Substances 0.000 claims description 27
- 239000004020 conductor Substances 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 230000010006 flight Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 55
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000000295 complement effect Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 16
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 description 16
- 239000000498 cooling water Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 229940052299 calcium chloride dihydrate Drugs 0.000 description 13
- 239000012530 fluid Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 229960002713 calcium chloride Drugs 0.000 description 6
- 229910001628 calcium chloride Inorganic materials 0.000 description 6
- 239000001110 calcium chloride Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- 229910052736 halogen Inorganic materials 0.000 description 6
- 150000002367 halogens Chemical class 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- AEEAZFQPYUMBPY-UHFFFAOYSA-N [I].[W] Chemical compound [I].[W] AEEAZFQPYUMBPY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052724 xenon Inorganic materials 0.000 description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000013529 heat transfer fluid Substances 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 229920002545 silicone oil Polymers 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
- F26B11/14—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a horizontal or slightly-inclined plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Molecular Biology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A dehydration drying system, comprising a dryer and a heat exchanger; the heat exchanger is provided with 2 material inlets and 2 material outlets; the dryer is provided with a steam outlet, a microwave transmitter, a material inlet and a material outlet; the dryer is connected with the heat exchanger through a material outlet and a material inlet, and the dried hot material is subjected to heat exchange with the undried cold material through the heat exchanger, so that the temperature of the hot material is reduced and the waste heat is recovered; the steam generated by dehydration exchanges heat with the undried cold material through a heat exchanger, so that condensation of the steam and recovery of waste heat are realized, and the waste heat generated by the microwave transmitter heats the cold material to realize recovery. The dryer integrates conductive heating and microwave heating technologies. The beneficial effects of the invention are as follows: the conduction heating and microwave heating technology is integrated, the advantages are complementary, and dehydration is cooperatively promoted; and the heat exchange equipment is utilized to promote the temperature reduction of the dried hot materials and steam, and the cold materials to be dried are utilized to absorb waste heat, so that the recycling of the waste heat is realized, and the energy conservation and the emission reduction are realized.
Description
Technical Field
The invention relates to the technical field of drying, in particular to a dehydration drying system and dehydration heat exchange equipment.
Background
The microwave is an electromagnetic wave with a short wavelength, the wavelength is 1 mm-1000 mm, and the frequency range is 300 MHz-300000 MHz. Principle of microwave heating and drying: polar molecules (water molecules) vibrate at high speed under the action of high-frequency electromagnetic waves and rub to generate a thermal effect, so that the inside and the surface of a substance are heated at the same time. Different substances have different capacities of generating actions with microwaves and have different heating effects. The water molecules can generate strong oscillation with microwaves, and a strong thermal effect is generated; therefore, the substances containing water can be heated by microwaves, and the heating rate is high. The microwave heating speed is high, the heating speed is also high, and some substances can be dried only by a few minutes; the moisture content can be reduced to within one percent. However, the unit energy consumption of microwave drying is relatively high, and the power consumption for removing 1kg of water is 1.2-1.5 degrees.
The conduction heating mode causes the surface of the substance to be heated firstly and then transferred to the inside of the object; however, most substances have low heat conductivity, are unfavorable for the internal heating of objects, and cause slow drying rate and high energy consumption of the heat conduction type dryer; some substances are difficult to completely dehydrate, and cannot meet the application requirements. In addition, the combustion of coal and gas is accompanied by carbon dioxide emissions, which is contrary to the achievement of peaks of carbon and the goal of carbon neutralization and two-carbon. Hydropower, wind power and solar power generation are all green energy sources and can be used for microwave heating equipment.
In addition, most solid materials have low thermal conductivity, resulting in low drying efficiency of conventional dryers. The traditional technical equipment for heating and drying by utilizing heat conduction and the microwave heating mode capable of directly heating the interior of the material are integrated and optimized, so that complementary advantages are realized, the defects of the traditional dehydration and drying technology can be overcome, the dehydration efficiency is improved, and the pollutant emission is reduced. The dual purposes of high-efficiency utilization of energy and energy conservation and emission reduction are achieved.
Secondly, the existing drier uses an external heat source to heat materials, and directly utilizes photo-thermal heating equipment or electric heating equipment to replace traditional external heat sources (steam, molten salt, heat conducting oil and the like) to heat the materials, so that circulating equipment and independent heating equipment of hot fluid can be eliminated, and not only can energy consumption be reduced, but also equipment cost can be reduced.
Disclosure of Invention
The invention aims to overcome the defects of the traditional dehydration drying technical equipment, and provides a novel dehydration drying system which can also realize the recycling of waste heat, save energy and reduce emission.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a high-efficiency dehydration drying system and dehydration heat exchange equipment comprise a dryer, a heat exchanger and a heat exchanger; the heat exchanger is respectively provided with 2 material inlets and 2 material outlets; the dryer and the heat exchanger are connected through a material inlet and a material outlet, and the dried hot material exchanges heat with the undried cold material through the heat exchanger, so that the temperature of the hot material is reduced and the waste heat is recovered; the steam generated by dehydration exchanges heat with the undried cold material through a heat exchanger, and the condensation recovery and waste heat recovery of the steam are promoted and realized. The dryer can be a conventional various dehydrators or can also be a novel microwave dehydrator. The dryer is provided with a steam outlet, a microwave transmitter or a microwave feed inlet, a material inlet and a material outlet. The heat exchanger can be an existing heat exchanger or a novel heat exchanger. The steam generated by the dehydration dryer is led into a heat exchanger to exchange heat with cold materials to be dehydrated, the cold materials are recovered after being cooled, and the cold materials are heated and then enter the dryer for dehydration; not only saves energy, but also is beneficial to condensing steam. The cooling water of the microwave emitter also exchanges heat with the cold material to be dehydrated, so that waste heat recovery is realized. The dehydrated and dried hot material exchanges heat with the cold material to be dehydrated, thereby realizing waste heat recovery and being beneficial to material cooling.
Further, the dryer is selected from a microwave rake dryer, a microwave drum scraper dryer or a microwave blade dryer.
Further, the self-microwave rake dryer, the microwave roller scraper dryer or the microwave paddle dryer is characterized in that a microwave feed inlet is arranged at the top or a steam cover of a conventional rake dryer, a conventional roller scraper dryer or a conventional paddle dryer, and microwave radiation is carried out on the dried materials.
Further, a heating cavity is arranged outside the material cylinder of the conventional rake dryer and the microwave rake dryer, and a heater is arranged in the heating cavity to heat the material cylinder; the rollers of the conventional roller scraper dryer and the microwave roller scraper dryer are internally provided with heater heating rollers; the material barrels of the conventional paddle dryer and the microwave paddle dryer are provided with a heating cavity, and a heater is arranged in the heating cavity to heat the material barrels.
Further, the heat exchanger is selected from a spiral feeding heat exchanger which is provided with a hollow shaft and a propeller blade, wherein the propeller blade is fixed on the hollow shaft, and cold fluid enters the shaft center to exchange heat with external materials; the device is also provided with a material cylinder, the cylinder wall is provided with fixed fins which promote heat transfer, and the shaft and the propeller blades are arranged in the material cylinder and driven to rotate by a motor; the material cylinder is provided with 1 material inlet and outlet respectively, the outer side of the material cylinder is provided with Cheng Huanre fluid chambers, and the chambers are provided with 1 material inlet and outlet respectively.
Further, the heat exchanger is selected from a solid-solid material conveying heat exchanger, the solid-solid material conveying heat exchanger comprises 2 screw conveyors, the 2 screw conveyors are connected and fixed into a whole, the 2 screw conveyors are respectively provided with 1 material cylinder, and the 2 material cylinders are respectively provided with 1 material inlet and 1 material outlet; fins are arranged on the walls of the 2 material cylinders; the 2 screw conveyors are respectively provided with 1 shaft with spiral sheets, and the spiral sheets and the shafts are placed in a material cylinder and driven by a motor to rotate; the outside of the 2 screw conveyors which are fixed integrally is provided with a heat conductor connection or a heat conductor chamber, and the chamber is provided with 1 material port.
Further, the microwave feed inlet is provided with a microwave transmitter, cooling water of the microwave transmitter enters the heat exchanger to exchange heat with the undried cold material, the cooling water is cooled and then flows back into the microwave transmitter, the cooling water is recycled, waste heat is recovered, and the cold material after heat absorption enters the dryer to be dehydrated or enters the other heat exchanger again.
The beneficial effects of the invention are as follows: the dehydration drying system integrates the conduction type drying equipment and the microwave drying equipment, so that the drying efficiency is improved; the material to be dried and the dried hot material are subjected to heat exchange by utilizing heat exchange equipment, so that the temperature can be reduced and the heat energy can be saved; and the steam generated in the drying process is utilized to heat the materials to be dried, so that the waste heat recovery and utilization are realized, and the energy is saved.
Drawings
Fig. 1 is a schematic diagram of the dewatering system of the present invention.
Fig. 2 is a schematic structural view of the microwave drum scraper dryer of the present invention.
Fig. 3 is a schematic structural view of the spiral feeding heat exchanger of the present invention.
Fig. 4 is a schematic structural view of the microwave paddle dryer of the present invention.
Fig. 5 is a schematic structural view of the microwave rake dryer of the present invention.
Fig. 6 is a schematic structural view of a solid-solid material transfer heat exchanger of the present invention.
As shown in the figure: 1. a dryer; 2. a heat exchanger; 3. a heat exchanger; 4. a heat exchanger; 5. a microwave transmitter and a microwave feed port; 6. a steam outlet; 7. a material outlet; 8. a material inlet; 9. a material inlet; 10. a material outlet; 11. a cold material inlet; 12. a hot material outlet; 13. a cooling water inlet; 14. a cooling water outlet; 15. a condensed water outlet; 16. a material outlet; 17. a steam inlet; 18. a material inlet; 19. a material outlet; 20. a material inlet; 21. a rotating shaft; 22. a steam hood; 221. a steam hood; 222. a steam hood; 23. a scraper; 24. a roller; 25. a bracket; 26. a screw feeder; 27. a motor; 28. a heater; 281. a heater; 282. a heater; 29. a material pool; 30. a spiral sheet; 301. a spiral sheet; 31. a screw shaft; 32. exchanging the fluid chamber; 33. a fin; 331. a fin; 34. a liquid inlet of the shaft; 35. a bracket; 36. a motor; 37. a liquid outlet of the shaft; 38. a motor; 39. a blade shaft; 40. a heating chamber; 41. a bracket; 42. a paddle; 43. a blade shaft; 44. a motor; 45. a paddle; 46. a heat exchange chamber; 47. a heat exchange fluid inlet and outlet; 48. a screw shaft; 49. a metal fixing member; 50. a housing; 51. a material cylinder; 52. a material cylinder.
Detailed Description
Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In connection with fig. 1-6, the present invention, when embodied, is:
the utility model provides a high-efficient dehydration drying system and dehydration heat transfer equipment, includes desiccator 1, heat exchanger 2, heat exchanger 3 and heat exchanger 4, heat exchanger 4 on be equipped with material entry 9, material export 7, entry 8 and export 10, desiccator 1 on be equipped with steam outlet 6, microwave transmitter 5, entry 18, material export 19, heat exchanger 2 on be equipped with export 15, material export 16, steam entry 17 and material entry 20, heat exchanger 3 on be equipped with cold material entry 11, hot material export 12, cooling water entry 13 and cooling water export 14, heat exchanger 3 pass through cooling water entry 13 and cooling water export 14 and communicate microwave transmitter 5 respectively and dispel the heat, hot material export 12 communicate material entry 20, material export 16 communicate material entry 18, material export 19 communicate entry 8, material export 7 communicate desiccator 1, steam outlet 6 communicate steam entry 17 of heat exchanger 2.
The dryer 1 can be a microwave rake dryer, a microwave roller scraper dryer or a microwave blade dryer, or can be a conventional dryer.
The microwave transmitter 5 transmits microwaves to enter the dryer 1 through the feed-in port to radiate materials to be dried. If the microwave emitter is not used or the microwave emitter does not need to be cooled, the heat exchanger 3 is not needed, and cold materials directly enter the heat exchanger 2 through the inlet 20, absorb heat and then enter the dryer 1 through the material ports 16 and 18 for dehydration.
The heat exchangers 2, 3 and 4 can adopt plate heat exchangers, spiral feeding heat exchangers or solid-solid material conveying heat exchangers, and can also adopt other heat exchangers.
The material to be dehydrated enters the heat exchanger 4 through the material inlet 9 to exchange heat with dehydrated hot material from the dryer 1, the material enters the heat exchanger 4 through the material inlet 9 to exchange heat, the heated material enters the dryer 1 through the material outlet 7 to dehydrate, the water vapor generated by dehydration enters the heat exchanger 2 through the steam outlet 6 to exchange heat with the material from the heat exchanger 3 to be cooled and enter the collector through the outlet 15, the microwave emitter 5 emits microwaves to enter the dryer 1 through the feed-in port to radiate the material to be dried, the heat exchanger 3 is respectively communicated with the microwave emitter 5 through the cooling water inlet 13 and the cooling water outlet 14 to dissipate heat, the cold material to be dehydrated enters the heat exchanger 3 through the material inlet 11 to enter the heat exchanger 2 through the material outlet 12 and the material inlet 20 to exchange heat with steam from the dryer 1, the heated material enters the dryer 1 through the material outlet 16 and the inlet 18 to dehydrate, the dried material enters the heat exchanger 4 through the material outlet 19 and the inlet 8 to exchange heat with the material to leave the drying system through the outlet 10, and enters the packaging bag.
The microwave roller scraper dryer (shown in figure 2) comprises a rotating shaft 21, a steam cover 22, a scraper 23, a roller 24, a steam outlet 6, a spiral feeding heat exchanger 26, a bracket 25, a motor 27, a heater 28, an inlet 18, a material pool 29, a microwave emitter 5 and a driving motor for driving the rotating shaft 21 to rotate.
When the microwave drum scraper dryer and the spiral feeding heat exchanger are used in combination, the microwave drum scraper dryer enters a material pool 29 of the microwave drum scraper dryer from an inlet 18, the material pool 29 is fixed below a drum 24, liquid materials in the rotating drum 24 adhered to the material pool 29 are dehydrated and dried on the surface of the hot drum 24, the dried materials are scraped by a scraper 23 and enter the spiral feeding heat exchanger through an inlet 8, the materials are moved to an outlet 10 to enter a charging bag under the pushing of a spiral sheet 30, and the material moving process is cooled. The shaft 21 and the roller 24 are integrated, the motor 27 drives the shaft 21 and the roller 24 to rotate, the microwave emitter 5 or the microwave feed-in port is fixed on the steam cover 22 of the microwave roller scraper dryer, the microwave irradiates materials on the surface of the roller 24 of the microwave roller scraper dryer, the steam outlet 6 is fixed on the steam cover 22 of the microwave roller scraper dryer, the heater 28 is fixed inside the roller 24, and the equipment for heating the roller 24 is selected from a xenon lamp heater, an iodine tungsten lamp heater, a mercury lamp heater, a halogen lamp, a metal halogen lamp heater, a light wave heating tube, an infrared heating tube, a quartz heating tube, a carbon fiber heating tube and various heating wire heaters. The microwave drum blade dryer may be heated by an external heat source without using the heater 28. Instead of using microwaves, dehydration and drying can be performed using only the heater 28.
The spiral feeding heat exchanger (shown in figure 3) comprises a material outlet 7, an inlet 8, a material inlet 9, an outlet 10, a spiral sheet 30, a spiral shaft 31, a heat exchange fluid cavity 32, a spiral fin 33, a liquid inlet 34 of the shaft, a bracket 35, a second motor 36 and a liquid outlet 37 of the shaft. The hot solid materials dried by the microwave roller scraper dryer enter the spiral feeding heat exchanger from the inlet 8, the spiral sheets 30 are fixed on the shaft 31, and the spiral sheets 30 can be discontinuous or continuous. The second motor 36 drives the shaft 31 and the spiral sheet 30 to rotate, so that the material is pushed to the outlet 10, flows out and enters the packaging bag. The heat exchange fluid enters the shaft 31 through the inlet 34 to exchange heat with the hot solid material, and flows out through the outlet 37 after being heated, and enters the material pool 29 of the microwave drum scraper dryer to be dehydrated and dried. The spiral fins 33 are fixed on the inner wall of the spiral feeding heat exchanger, and coupled with the spiral sheets 30, and may be continuous or discontinuous on the inner wall. The cold liquid material inlet 9 enters the heat exchange fluid cavity 32, exchanges heat with the hot material through the inner wall and the spiral fins 33, and enters the material pool 29 of the microwave roller scraper dryer through the material outlet 7 after being heated to start dehydration and drying.
A microwave paddle dryer (as shown in fig. 4) comprises a microwave emitter 5, a steam outlet 6, a material inlet 18, a material outlet two 19, a steam cover 221, a heater 281, a motor three 38, a paddle shaft 39, a heating cavity 40, a bracket 41 and paddles 42. The motor 38 drives the shaft 39 to rotate, the paddle 42 is fixed to the shaft 39, and the motor three 38 drives the shafts 39 and 42 to rotate. The material enters the dryer through the inlet 18, moves under the rotation of the paddle 42, generates heat exchange and dehydration, and the dry material flows out through the material outlet 19 and enters the heat exchange screw conveyor through the feed inlet 8; the generated steam flows out through the steam outlet 6. The microwave emitter 5 or the microwave feed-in port is fixed on a steam cover one 221 of the microwave paddle dryer, and the microwave radiation material is dehydrated. A heater 281 of the microwave paddle dryer is fixed in the heating chamber 40 to heat the material. The heater 281 of the microwave paddle dryer is selected from a xenon lamp heater, an iodine tungsten lamp heater, a mercury lamp heater, a halogen lamp, a metal halogen lamp heater, a light wave heating tube, an infrared heating tube, a quartz heating tube, a carbon fiber heating tube, and various heating wire heaters. The microwave paddle dryer may be heated by an external heat source without using the heater 281. The dehydration and drying can be performed by using only the heater 281 without using microwaves.
A microwave rake dryer (fig. 5) comprises a microwave emitter 5, a steam outlet 6, a material inlet 18, a material outlet 19, a steam hood 222, a heater 282, a blade shaft 43, a motor four 44, a heating cavity 40 and a blade 45. Motor four 44 drives the shaft 43 to rotate, and the paddle 45 is fixed to the shaft 43, and motor four 44 drives the shafts 43 and 45 to rotate. The material enters the dryer through the inlet 18, moves under the rotation of the blade 45, exchanges heat and dewaters, and the dry material flows out through the material outlet 19 and enters the heat exchange screw conveyor through the feed inlet 8; the generated steam flows out through the steam outlet 6. The microwave transmitter 5 or the microwave feed-in port is fixed on the second steam cover 222, and the microwave radiation material is dehydrated. The heater 282 is fixed in the heating chamber 40 to heat the material, and the heater 282 of the microwave rake dryer is selected from a xenon lamp heater, an iodine tungsten lamp heater, a mercury lamp heater, a halogen lamp, a metal halogen lamp heater, a light wave heating tube, an infrared heating tube, a quartz heating tube, a carbon fiber heating tube and various heating wire heaters. The microwave rake dryer may be heated by an external heat source without using the heater 282. The drying can be performed by using only the heater 282 without using microwaves.
The solid-solid material conveying heat exchanger (shown in fig. 6) comprises a material outlet 7, a material inlet 8, a material inlet 9, a material outlet 10, a spiral sheet 301, a spiral fin 331, a motor five 36, a heat exchange cavity 46, a heat exchange fluid inlet and outlet 47, a spiral shaft 48, a metal fixing piece 49, a shell 50, a material cylinder 51 and a material cylinder 52. The material outlet 7, the material inlet 9 and the material cylinder 52 are communicated, the outlet 10 and the inlet 8 are communicated with the material cylinder 51, the solid-solid material conveying heat exchanger is a dividing wall type heat exchange device, and the screw 301 is used for pushing the material to move, so that the heat exchange effect is improved. The hot and cold materials are respectively in 2 material cylinders and are respectively pushed by the screw 301 to move in opposite directions. The metal connecting piece 49 is arranged between the cold and hot material cylinders 51 and 52 for fixing and transferring heat, 1 sleeve 50 is arranged outside the 2 material cylinders 51 and 52, the connecting piece is arranged between the material cylinders and the sleeve 50 for fixing, and the cavity between the material cylinders 51 and 52 and the sleeve 50 is filled with heat conducting materials for promoting the heat transfer between the cold and hot material cylinders 51 and 52. The hot and cold material cylinders 51 and 52 may be an integral body. The inner walls of the cold and hot material cylinders 51 and 52 are provided with heat conducting fins 331 for promoting heat exchange between the materials and the cylinder walls. Hot solid material enters the barrel 51 of the solid-solid material transfer heat exchanger from inlet 8. The spiral sheet 301 is fixed on the shaft 48, and the spiral sheet 301 may be discontinuous or continuous. The fifth motor 36 drives the shaft 48 and the flights 301 to rotate to push the material toward the outlet 10 and out into the package. Cold material enters the material cylinder 52 through the material inlet 9, the five 36 driving shaft 48 of the motor and the spiral sheet 301 rotate to push the material to the material outlet 7, and the cold material enters the dryer through the inlet 18 for dehydration after flowing out. The fins 331 are fixed to the walls of the material cylinder 51 and the material cylinder 52, and are coupled to the spiral piece 301, and may be continuous or discontinuous on the walls. The 2 cartridges are connected and fixed by a metal fixing member 49, and the shell 50 is connected and fixed with the cartridges 51 and 52 by the fixing member 49. The heat exchange chamber 46 may be filled with a heat transfer fluid and a heat transfer solid material, the heat transfer fluid being introduced into the heat exchange chamber 46 through the inlet and outlet 47, the heat transfer body transferring heat energy from the hot material to the cold material.
Embodiment one:
in the embodiment, a microwave roller scraper dryer and a plate type heat exchanger are combined to form a dehydration drying system. The specific constitution of the dewatering system is described as follows: in the drying system, the dryer 1 is a microwave roller scraper dryer, the heat exchangers 2 and 3 are plate heat exchangers (prior art), and the heat exchanger 4 is a spiral feeding heat exchanger shown in fig. 3.
Steam output from the steam outlet 6 of the microwave drum scraper dryer enters the heat exchanger 2 through the steam inlet 17 to exchange heat with the calcium chloride solution, and the steam is condensed and flows out through the outlet 15 to be recovered. The cooling water of the microwave emitter 5 enters the plate heat exchanger 3 through the inlet 13, is cooled and flows back to the microwave emitter 5 through the outlet 14, and is circulated. Cold calcium chloride solution enters the heat exchanger 3 from the cold material inlet 11, enters the heat exchanger 2 from the material outlet 12 and the material inlet 20 after heat exchange, and enters the microwave drum scraper dryer from the material outlet 16 and the inlet 18 after heating; the dehydrated solid calcium chloride flows out from the material outlet 19, enters the spiral feeding heat exchanger through the inlet 8, is cooled and moves to the outlet 10 to enter the packaging bag under the spiral pushing. The cold material calcium chloride solution enters the spiral feeding heat exchanger from the material inlet 9, is heated and simultaneously moves to the material outlet 7 under the spiral pushing, and then enters the microwave roller scraper dryer through the inlet 18 to start dehydration. The 40% calcium chloride solution is dehydrated to obtain solid calcium chloride with water content of 5.2%. The energy consumption is reduced by about 53% by waste heat recovery.
Embodiment two:
in the embodiment, a dehydration drying system is formed by combining a microwave rake dryer with a spiral feeding heat exchanger and a solid-solid material conveying heat exchanger. The specific constitution of the dewatering system is described as follows: in the drying system, the dryer 1 is a microwave rake dryer, the heat exchangers 2 and 3 are spiral feeding heat exchangers, and the heat exchanger 4 is a solid-solid material heat exchanger.
The steam output from the steam outlet 6 of the microwave rake dryer is introduced into the spiral feeding heat exchanger of the first heat exchanger 2 through the steam inlet 17 to exchange heat with the calcium chloride dihydrate, and the steam is condensed and flows out through the material outlet 15 to be recovered. The cooling water of the microwave emitter 5 enters the spiral feeding heat exchanger 3 through the inlet 13, and flows back to the microwave emitter 5 through the outlet 14 after being cooled, and is circulated in this way. Cold calcium chloride dihydrate enters the spiral feeding heat exchanger 3 from the inlet 10, is heated, enters the spiral feeding heat exchanger 2 through the material outlet 12 and the inlet 20, is heated again, and is conveyed to the microwave rake dryer through the outlet 16 and the inlet 18 to start dehydration. The dehydrated calcium chloride flows out through the material outlet 19, then enters the material cylinder 51 of the solid-solid material conveying heat exchanger through the inlet 8, is cooled and moves to the outlet 10 to enter the packaging bag under the spiral pushing. The cold material calcium chloride dihydrate enters the material cylinder 52 of the solid-solid material conveying heat exchanger from the material inlet 9, is heated and simultaneously moves to the material outlet 7 under the pushing of the screw, and then enters the microwave rake dryer to start dehydration. The water content of the dehydrated calcium chloride dihydrate is reduced from 23% to 6.4%. The waste heat recovery is utilized, and the energy consumption is reduced by about 42 percent.
Embodiment III:
in the embodiment, a dehydration drying system is formed by combining a microwave paddle dryer with a spiral feeding heat exchanger and a solid-solid material conveying heat exchanger. The specific constitution of the dewatering system is described as follows: in the drying system, the dryer 1 is a microwave paddle dryer, the heat exchangers 2 and 3 are spiral feeding heat exchangers, and the heat exchanger 4 is a solid-solid material conveying heat exchanger.
The steam output by the steam outlet 6 of the microwave paddle dryer is introduced into the spiral feeding heat exchanger 2 through the steam inlet 17 to exchange heat with the calcium chloride dihydrate, and the steam is condensed and flows out through the material outlet 15 to be recovered. The cooling water of the microwave emitter 5 enters the spiral feeding heat exchanger 3 through the inlet 13, and flows back to the microwave emitter 5 through the outlet 14 after being cooled, and is circulated in this way. Cold calcium chloride dihydrate enters the spiral feeding heat exchanger 3 from the inlet 10, is heated, enters the spiral feeding heat exchanger 2 through the material outlet 12 and the inlet 20, is heated again, and is conveyed to the microwave paddle dryer through the outlet 16 and the inlet 18 to start dehydration. The dehydrated calcium chloride flows out through the material outlet 19, enters the material cylinder 51 of the solid-solid material conveying heat exchanger through the inlet 8, is cooled and moves to the outlet 10 to enter the packaging bag under the spiral pushing. The cold material calcium chloride dihydrate enters the material cylinder 52 of the solid-solid material conveying heat exchanger from the material inlet 9, is heated and simultaneously moves to the material outlet 7 under the pushing of the screw, and then enters the self-heating paddle dryer to start dehydration. The water content of the dehydrated calcium chloride dihydrate is reduced from 23% to 5.6%. The waste heat recovery is utilized, and the energy consumption is reduced by about 39 percent.
Embodiment four:
the embodiment is a combination dehydration drying of a microwave roller scraper dryer (shown in figure 2) and a spiral feeding heat exchanger (shown in figure 3). The top of the roller scraper dryer is provided with a microwave emitter 5, a calcium chloride solution with the concentration of 50% of cold materials enters the spiral feeding heat exchanger through an inlet 9, the cold materials are heated after being absorbed, the cold materials enter a material pool 29 of the microwave roller scraper dryer through an outlet 7, the roller 24 rotates, the material liquid adhered to the surface of the roller 24 is heated and dehydrated, and the microwave 5 radiates the material on the surface of the roller to promote dehydration. The dried material is stripped off the roller by a scraper 23, enters a spiral feeding heat exchanger through a feed inlet 8, is collected and packaged at a discharge outlet 10 after heat exchange and cooling, and is dehydrated and dried. The drum temperature is 160 ℃, and the water content of the solid calcium chloride obtained after the dehydration of the 50% calcium chloride solution is about 4%. The same solution was dried with a conventional roller blade dryer without microwave-assisted heating, the roller temperature was also 160 degrees, and the resulting solid calcium chloride contained about 22% water, i.e., calcium chloride dihydrate, rather than anhydrous calcium chloride.
Fifth embodiment:
in this embodiment, a self-heating type roller scraper dryer (as shown in fig. 3), a U-shaped electric heating rod 28 is arranged on the inner wall of a roller 24, the U-shaped electric heating rod is heated, the temperature of the roller is raised to 210 ℃, 45% calcium chloride solution is dehydrated, and the water content of calcium chloride is 6.3% after dehydration.
Example six:
in this embodiment, in the self-heating type microwave paddle dryer (as shown in fig. 4), an iodine tungsten lamp heat source 281 is installed in a heating cavity 40, microwaves radiate material calcium chloride dihydrate through a feed-in port 5, a shaft 39 is a solid shaft, and the temperature of the cavity 40 is stabilized at 160 ℃. The paddles 42 agitate the calcium chloride dihydrate to promote heat absorption while pushing the calcium chloride dihydrate toward the outlet 10 after dehydration, it exits the bag through the outlet 10. The water content of the calcium chloride is reduced from 23% to 5.2%.
Embodiment seven:
this embodiment is a combination of self-heating microwave rake dryer (fig. 5) and solid-solid material transfer heat exchanger (fig. 6). An electric heating pipe 282 and molten salt are arranged in a heating cavity 40 of the self-heating microwave rake dryer, a material cylinder and materials are heated by the molten salt as a heating medium, and a microwave transmitter 5 transmits microwave radiation material calcium chloride dihydrate. Calcium chloride dihydrate enters the self-heating microwave rake dryer through the inlet 18, the rake teeth 45 rotate to promote heat exchange and movement of materials, and meanwhile, the materials flow out through the outlet 19 and then enter the material cylinder 51 of the solid-solid material conveying heat exchanger through the inlet 8, cold calcium chloride dihydrate enters the solid-solid material conveying heat exchanger through the inlet 9, heat exchange is carried out in the material cylinder 52, the materials are pushed to move to the outlet 7 by the spiral sheet 301, and then enter the self-heating microwave rake dryer through the inlet 18 for dehydration. The dehydrated hot material enters the material cylinder 51 through the inlet 8 to exchange heat with the cold material in the material cylinder 52, and the spiral sheet 301 pushes the material to move to the outlet 10 to flow out of the bag. The heat exchange chamber 46 of the solid-solid material conveying heat exchange machine is filled with heat conducting silicone oil, the temperature is stabilized at 150 ℃, and the water content of the dehydrated calcium chloride dihydrate is reduced from 23% to 5.7%.
The above description is illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, but is to be accorded the full scope of the claims.
Claims (4)
1. A dewatering and drying system, characterized in that: the dehydration drying system comprises a dryer and a heat exchanger; the dryer is connected with the heat exchanger through a material outlet and a material inlet, and the hot material dehydrated and dried by the dryer exchanges heat with the undried cold material through the heat exchanger, so that the temperature of the hot material is reduced and the waste heat is recovered; and the steam generated by dehydration and drying of the dryer is subjected to heat exchange with the undried cold material through a heat exchanger, so that condensation of the steam and waste heat recovery are realized.
2. A dewatering and drying system as set forth in claim 1, wherein: the dryer is selected from a microwave rake dryer, a microwave roller scraper dryer or a microwave blade dryer.
3. A dewatering and drying system as claimed in claim 2, wherein: the microwave rake dryer, the microwave roller scraper dryer and the microwave paddle dryer are materials dried by microwave radiation, wherein a microwave feed inlet is arranged on the top or a steam cover of a conventional rake dryer, a conventional roller scraper dryer or a conventional paddle dryer.
4. A dewatering and drying system as set forth in claim 1, wherein: the heat exchanger is selected from solid-solid material heat exchangers, the solid-solid material heat exchangers are connected and fixed into a whole by 2 spiral conveying heat exchangers, the outside of the 2 spiral conveying heat exchangers which are fixed into a whole is provided with a heat conductor connection or a heat conductor cavity, and the cavity is provided with 1 material inlet and outlet respectively; the heat exchanger is used for heat exchange between solid materials; the 2 spiral conveying heat exchangers are respectively provided with 1 material cylinder, and the 2 material cylinders are respectively provided with 1 material inlet and 1 material outlet; fins are arranged on the walls of the 2 material cylinders; the 2 screw conveyors are each provided with 1 shaft with flights, which are placed in the barrel and driven in rotation by a motor.
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