CN114001525A - High-efficient dehydration drying system and dehydration indirect heating equipment - Google Patents
High-efficient dehydration drying system and dehydration indirect heating equipment Download PDFInfo
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- CN114001525A CN114001525A CN202111330856.1A CN202111330856A CN114001525A CN 114001525 A CN114001525 A CN 114001525A CN 202111330856 A CN202111330856 A CN 202111330856A CN 114001525 A CN114001525 A CN 114001525A
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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
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- 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
Abstract
A dehydration drying system comprises a dryer and a heat exchanger; the heat exchanger is provided with 2 material inlets and 2 material outlets; the drier 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 the material outlet and the material inlet, and the dried hot material exchanges heat with the cold material which is not dried through the heat exchanger, so that the temperature reduction of the hot material and the recovery of waste heat are realized; the steam generated by dehydration exchanges heat with the cold materials which are not dried through the heat exchanger, the condensation of the steam and the recovery of waste heat are realized, and the waste heat generated by the microwave transmitter heats the cold materials to realize the recovery. The dryer integrates conduction heating and microwave heating technologies. The invention has the beneficial effects that: the conduction heating technology and the microwave heating technology are integrated, the advantages are complementary, and dehydration is promoted cooperatively; the heat exchange equipment is used for promoting the temperature reduction of the dried hot materials and the steam, and the cold materials needing to be dried are used for absorbing waste heat, so that the recycling of the waste heat is realized, the energy is saved, and the emission is reduced.
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. The principle of microwave heating drying is as follows: polar molecules (water molecules) generate high-speed oscillation and friction under the action of high-frequency electromagnetic waves to generate a heat effect, so that the interior and the surface of a substance are heated simultaneously. Different substances have different abilities to interact with microwaves and have different heating effects. The water molecules can strongly vibrate with the microwaves to generate strong thermal effect; therefore, the substance containing water can be heated by microwave and the heating rate is fast. The microwave heating speed is high, the temperature rising speed is also high, and some substances can be dried in a few minutes; the moisture content can be reduced to one percent. However, the unit energy consumption of microwave drying is relatively high, and 1.2 to 1.5 degrees of electricity is consumed for removing 1kg of water.
The conduction heating mode is that the surface of the substance is heated first and then is transferred to the inside of the object; however, most of the materials have low thermal conductivity, which is not beneficial to heating the inside of the object, resulting in 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, coal and gas combustion is accompanied by carbon dioxide emissions, contrary to the carbon spike and the achievement of the carbon-neutral dual-carbon goal. Water and electricity, wind power and solar power generation are green energy sources and can be used for microwave heating equipment.
In addition, most solid materials have low thermal conductivity, which causes low drying efficiency of the conventional drying machine. The traditional technical equipment utilizing heat conduction heating drying 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 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 dryer uses an external heat source to heat materials, and directly utilizes photo-thermal heating equipment or electric heating equipment to replace the traditional external heat source (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, the energy consumption is reduced, and the equipment cost can be reduced.
Disclosure of Invention
The invention aims to overcome the defects of the traditional dehydration drying technical equipment and provide a novel dehydration drying system, which can realize the recycling of waste heat, energy conservation and emission reduction.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
an efficient 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 is connected with the heat exchanger through the material inlet and the material outlet, and the dried hot material exchanges heat with the cold material which is not dried through the heat exchanger, so that the temperature reduction and waste heat recovery of the hot material are realized; the steam generated by dehydration exchanges heat with the cold material which is not dried through the heat exchanger, thereby promoting and realizing the condensation recovery and the waste heat recovery of the steam. The dryer can be a conventional various dehydration dryers, and can also be the novel microwave dehydration dryer provided by the invention. 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 provided by the invention. Introducing steam generated by the dehydration dryer into a heat exchanger to exchange heat with cold materials to be dehydrated, cooling and recovering the cooled materials, and heating the cold materials and then dehydrating the heated cold materials in the dryer; not only saves energy, but also is beneficial to condensing steam. The cooling water of the microwave transmitter also exchanges heat with the cold materials to be dehydrated, so that waste heat recovery is realized. The heat exchange between the hot material after dehydration and the cold material to be dehydrated not only realizes the waste heat recovery, but also is beneficial to the material cooling.
Further, the dryer is selected from a microwave rake dryer, a microwave roller scraper dryer or a microwave paddle dryer.
Furthermore, 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 on the top or a steam cover of the conventional rake dryer, the conventional roller scraper dryer or the conventional paddle dryer, and microwave radiation is carried out on the dried material.
Furthermore, 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 conventional roller scraper dryer and the microwave roller scraper dryer are internally provided with a heater heating roller; the material barrel of the conventional paddle dryer and the microwave paddle dryer is externally provided with a heating cavity, and a heater is arranged in the heating cavity to heat the material barrel.
Further, the heat exchanger is selected from a spiral feeding heat exchanger, the spiral feeding heat exchanger is provided with a hollow shaft and a spiral blade, the spiral blade is fixed on the hollow shaft, and cold fluid enters the shaft center to exchange heat with external materials; the material barrel is also arranged, the barrel wall is provided with fixed fins which promote heat transfer, and the shaft and the propeller blade are placed in the material barrel and driven to rotate by the motor; the material barrel is provided with 1 material inlet and outlet respectively, the outer side of the material barrel is provided with a cavity for containing heat exchange fluid, and the cavity is 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 spiral conveyors, the 2 spiral conveyors are connected and fixed into a whole, the 2 spiral conveyors are respectively provided with 1 material barrel, and the 2 material barrels are respectively provided with 1 material inlet and 1 material outlet; the wall of each of the 2 material cylinders is provided with a fin; the 2 screw conveyors are respectively provided with 1 shaft with a screw plate, and the screw plate and the shaft are placed in the material barrel and driven by a motor to rotate; the outside of 2 fixed integrative screw conveyer is equipped with the heat conductor and connects or is equipped with a heat conductor cavity, and this cavity has 1 material mouth.
Furthermore, a microwave transmitter is arranged at the microwave feed inlet, cooling water of the microwave transmitter enters the heat exchanger to exchange heat with the cold materials which are not dried, the cooling water flows back to the microwave transmitter after being cooled, the cooling water is recycled, waste heat is recovered, and the cold materials which absorb heat enter the dryer to be dehydrated or enter another heat exchanger again.
The invention has the beneficial effects that: the dehydration drying system of the invention integrates the conduction type drying equipment and the microwave drying equipment, thereby improving the drying efficiency; the heat exchange equipment is utilized to carry out heat exchange between the material to be dried and the dried hot material, so that the temperature can be reduced and the heat energy can be saved; the steam generated in the drying process is used for heating the materials to be dried, so that the waste heat is recycled, 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 diagram of the construction of the microwave drum squeegee dryer of the present invention.
Fig. 3 is a schematic structural view of the spiral feed 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 the solid-solid material conveying 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-in 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 squeegee; 24. a drum; 25. a support; 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. a heat exchange fluid cavity; 33. a fin; 331. a fin; 34. a liquid inlet of the shaft; 35. a support; 36. a motor; 37. a liquid outlet of the shaft; 38. a motor; 39. a blade shaft; 40. a heating cavity; 41. a support; 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. and (5) a material cylinder.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
In order to make the content 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 drawings in the embodiments of the present invention.
The invention is embodied in conjunction with the accompanying figures 1-6:
a high-efficiency dehydration drying system and dehydration heat exchange equipment comprises a dryer 1, a heat exchanger 2, a heat exchanger 3 and a heat exchanger 4, wherein the heat exchanger 4 is provided with a material inlet 9, a material outlet 7, an inlet 8 and an outlet 10, the dryer 1 is provided with a steam outlet 6, a microwave transmitter 5, an inlet 18 and a material outlet 19, the heat exchanger 2 is provided with an outlet 15, a material outlet 16, a steam inlet 17 and a material inlet 20, the heat exchanger 3 is provided with a cold material inlet 11, a hot material outlet 12, a cooling water inlet 13 and a cooling water outlet 14, the heat exchanger 3 is respectively communicated with the microwave transmitter 5 through the cooling water inlet 13 and the cooling water outlet 14 to dissipate heat of the microwave transmitter 5, the hot material outlet 12 is communicated with the material inlet 20, the material outlet 16 is communicated with the material inlet 18, the material outlet 19 is communicated with the inlet 8, the material outlet 7 is communicated with the dryer 1, and the steam outlet 6 is communicated with the steam inlet 17 of the heat exchanger 2.
The dryer 1 can be a microwave rake dryer, a microwave roller scraper dryer or a microwave paddle dryer, and can also be a traditional dryer.
The microwave transmitter 5 transmits microwaves to enter the dryer 1 through the feed-in port to radiate the materials to be dried. If no microwave transmitter is used or cooling is not needed, 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 for dehydration through the material ports 16 and 18.
The heat exchanger 2, the heat exchanger 3 and the heat exchanger 4 can adopt a plate heat exchanger, a spiral feeding heat exchanger or a solid-solid material conveying heat exchanger, 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 the dehydrated hot material from the dryer 1, the material enters the heat exchanger 4 through the material inlet 9 to exchange heat, the material is heated and then enters the dryer 1 through the material outlet 7 to be dehydrated, 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, the material is cooled and then enters the collector through the outlet 15, the microwave transmitter 5 transmits 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 transmitter 5 through the cooling water inlet 13 and the cooling water outlet 14 to radiate heat for the microwave transmitter 5, the cold material to be dehydrated enters the heat exchanger 3 through the material inlet 11, the cold material is heated and then enters the heat exchanger 2 through the material transmitter outlet 12 and the material inlet 20 to exchange heat with the steam from the dryer 1, after being heated, the materials enter the dryer 1 through the material outlet 16 and the material inlet 18 for dehydration, the materials are dehydrated and dried in the dryer 1, the dried materials enter the heat exchanger 4 through the material outlet 19 and the material inlet 8 for heat exchange with cold materials, and leave the drying system through the material outlet 10 to enter a packaging bag.
The microwave roller scraper dryer (as 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 support 25, a motor 27, a heater 28, an inlet 18, a material pool 29 and a microwave transmitter 5, wherein the rotating shaft 21 is driven to rotate by the driving motor.
When the microwave roller scraper dryer and the spiral feeding heat exchanger are used in combination, the materials enter a material pool 29 of the microwave roller scraper dryer from an inlet 18, the material pool 29 is fixed below a roller 24, liquid materials adhered to the rotating roller 24 in the material pool 29 are dehydrated and dried on the surface of the hot roller 24, the dried materials are scraped by a scraper 23 and enter the spiral feeding heat exchanger through an inlet 8, the materials move to an outlet 10 to enter a material loading bag under the pushing of a spiral sheet 30, and the moving process of the materials is cooled. The shaft 21 and the drum 24 are integrated, the motor 27 drives the shaft 21 and the drum 24 to rotate, the microwave transmitter 5 or the microwave feed inlet is fixed on the steam cover 22 of the microwave drum scraper dryer, the microwave irradiates the material on the surface of the drum 24 of the microwave drum scraper dryer, the steam outlet 6 is arranged on the steam cover 22 of the microwave drum scraper dryer, the heater 28 is fixed inside the drum 24, and the equipment for heating the drum 24 is selected from a xenon lamp heater, a halogen lamp heater, a mercury lamp heater, a metal halide lamp heater, a light wave heating pipe, an infrared heating pipe, a quartz heating pipe, a carbon fiber heating pipe and various electric heating wire heaters. The microwave drum scraper dryer may be heated by an external heat source without the heater 28. The dehydration may be performed by using only the heater 28 without using microwaves.
The spiral feeding heat exchanger (as 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 shaft liquid inlet 34, a support 35, a second motor 36 and a shaft liquid outlet 37. The hot solid material dried by the microwave roller scraper dryer enters the spiral feeding heat exchanger through the inlet 8, the spiral sheet 30 is fixed on the shaft 31, and the spiral sheet 30 can be discontinuous or continuous. The second motor 36 drives the shaft 31 and the spiral piece 30 to rotate, so that the materials are pushed to the outlet 10 and flow out to enter the packaging bag. The heat exchange fluid enters the shaft 31 through the inlet 34 to exchange heat with the hot solid material, is heated and then flows out through the outlet 37, and enters the material pool 29 of the microwave roller scraper dryer to be dehydrated and dried. The spiral fins 33 are fixed to the inner wall of the spiral feed heat exchanger, are coupled to the spiral fins 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, is heated, and then enters the material pool 29 of the microwave roller scraper dryer through the material outlet 7 to start dehydration and drying.
The microwave paddle dryer (as shown in figure 4) comprises a microwave transmitter 5, a steam outlet 6, a material inlet 18, a material outlet II 19, a steam cover 221, a heater 281, a motor III 38, a paddle shaft 39, a heating cavity 40, a bracket 41 and a paddle 42. Motor 38 drives shaft 39 to rotate, paddle 42 is fixed to shaft 39, and motor 38 drives shafts 39 and 42 to rotate. The material enters the dryer through the inlet 18, moves and generates heat exchange and dehydration under the rotation of the paddle 42, 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 inlet is fixed on a first steam cover 221 of the microwave paddle dryer, and microwave radiation materials are 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, a iodine tungsten lamp heater, a mercury lamp heater, a halogen lamp, a metal halide lamp heater, a light wave heating pipe, an infrared heating pipe, a quartz heating pipe, a carbon fiber heating pipe, and various heating wire heaters. The microwave paddle dryer may be heated using an external heat source without the heater 281. Without using microwaves, dehydration can be performed only by using the heater 281.
The microwave rake dryer (as shown in fig. 5) comprises a microwave transmitter 5, a steam outlet 6, a material inlet 18, a material outlet 19, a steam cover 222, a heater 282, a blade shaft 43, a motor IV 44, a heating cavity 40 and blades 45. Motor four 44 drives shaft 43 to rotate, paddle 45 is fixed to shaft 43, and motor four 44 drives shafts 43 and 45 to rotate. The material enters the dryer through the inlet 18, moves and generates heat exchange and dehydration under the rotation of the paddle 45, 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 inlet is fixed on the second steam cover 222, and microwave radiation materials are 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, a iodine-tungsten lamp heater, a mercury lamp heater, a halogen lamp, a metal halide lamp heater, a light wave heating pipe, an infrared heating pipe, a quartz heating pipe, a carbon fiber heating pipe, and various electric heating wire heaters. The microwave rake dryer may be heated by an external heat source without the heater 282. The dehydration can be performed without using microwaves by using only the heater 282.
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 chamber 46, a heat exchange fluid inlet and outlet 47, a spiral shaft 48, a metal fixing piece 49, a shell 50, a material barrel 51 and a material barrel 52. The material outlet 7 is communicated with the material inlet 9 and the material barrel 52, the outlet 10 and the inlet 8 are communicated with the material barrel 51, the solid-solid material conveying heat exchanger is a dividing wall type heat exchange device, the screw propeller 301 is used for pushing the material to move, and the heat exchange effect is improved. The cold and hot materials are respectively pushed by the propellers 301 to move in opposite directions in the 2 material cylinders. A metal connecting piece 49 is arranged between the cold material cylinder 51 and the hot material cylinder 52 for fixing and transferring heat, 1 sleeve 50 is arranged outside 2 material cylinders 51 and 52, the connecting pieces are arranged between the material cylinders and the sleeves 50 for fixing, and a cavity between the material cylinders 51 and 52 and the sleeves 50 is filled with heat conducting materials to promote the heat transfer between the cold material cylinder 51 and the hot material cylinder 52. The hot and cold material drums 51 and 52 may be one unit. The inner walls of the cold and hot material cylinders 51 and 52 are provided with heat-conducting fins 331 to promote heat exchange between the materials and the cylinder walls. Hot solid material enters the material barrel 51 of the solid-solid material conveying heat exchanger from the inlet 8. Flight 301 is fixed to shaft 48, and flight 301 may be discontinuous or continuous. The motor five 36 drives the shaft 48 and the spiral plate 301 to rotate, so that the materials are pushed to the outlet 10 and flow out to enter the packaging bag. Cold materials enter the material barrel 52 through the material inlet 9, the motor five 36 drives the shaft 48 and the spiral piece 301 to rotate, the materials are pushed to the material outlet 7, and the materials flow out and enter the dryer through the inlet 18 for dehydration. Fins 331 are fixed to the walls of material cylinders 51 and 52, coupled to spiral 301, and may be continuous or discontinuous on the walls. The 2 material cylinders are connected and fixed by a metal fixing piece 49, and the shell 50 and the material cylinders 51 and 52 are connected and fixed by the fixing piece 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 added to the heat exchange chamber 46 through the inlet and outlet 47, the heat transfer fluid transferring heat energy from the hot material to the cold material.
The first embodiment is as follows:
in the embodiment, the microwave roller scraper dryer, the plate heat exchanger and the spiral feeding heat exchanger are combined to form the dehydration drying system. The specific construction of the dewatering system is described below: in the drying system, the dryer 1 is a microwave drum scraper dryer, the heat exchanger 2 and the heat exchanger 3 are plate heat exchangers (prior art), and the heat exchanger 4 is a spiral feed heat exchanger shown in fig. 3.
Steam output from a steam outlet 6 of the microwave roller scraper dryer enters the heat exchanger 2 through a steam inlet 17 to exchange heat with the calcium chloride solution, and the steam is condensed and flows out through an outlet 15 to be recycled. Cooling water of the microwave transmitter 5 enters the plate heat exchanger 3 through the inlet 13, is cooled and then flows back to the microwave transmitter 5 through the outlet 14, and the circulation is carried out. Cold calcium chloride solution enters the heat exchanger 3 from the cold material inlet 11, enters the heat exchanger 2 through the material outlet 12 and the material inlet 20 after heat exchange, and enters the microwave roller scraper dryer through the material outlet 16 and the material inlet 18 after being heated; the dehydrated solid calcium chloride flows out from the material outlet 19, enters the spiral feeding heat exchanger through the inlet 8, is moved to the outlet 10 to enter the packaging bag while being cooled 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 the water content of 5.2%. The energy consumption is reduced by about 53 percent through waste heat recovery.
Example two:
in the embodiment, the microwave rake dryer, the spiral feeding heat exchanger and the solid-solid material conveying heat exchanger are combined to form the dehydration drying system. The specific construction of the dewatering system is described below: in the drying system, the dryer 1 is a microwave rake dryer, the heat exchanger 2 and the heat exchanger 3 are spiral feed heat exchangers, and the heat exchanger 4 is a solid-solid material heat exchanger.
Steam output from a steam outlet 6 of the microwave rake dryer is introduced into a spiral feeding heat exchanger of the heat exchanger I2 through a steam inlet 17 to exchange heat with calcium chloride dihydrate, and the steam is condensed and flows out through a material outlet 15 to be recycled. Cooling water of the microwave transmitter 5 enters the spiral feeding heat exchanger 3 through the inlet 13, is cooled and then flows back to the microwave transmitter 5 through the outlet 14, and the circulation is carried out. 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, 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 barrel 51 of the solid-solid material conveying heat exchanger through the inlet 8, is cooled and moves to the outlet 10 to enter a packaging bag under the spiral pushing. The cold material calcium chloride dihydrate enters a material barrel 52 of the solid-solid material conveying heat exchanger from a material inlet 9, is heated and simultaneously moves to a material outlet 7 under the spiral pushing action, and then enters a microwave rake dryer to start dehydration. After dehydration, the water content of the calcium chloride dihydrate is reduced from 23 percent to 6.4 percent. And the waste heat recovery is utilized, so that the energy consumption is reduced by about 42 percent.
Example three:
in the embodiment, the microwave paddle dryer, the spiral feeding heat exchanger and the solid-solid material conveying heat exchanger are combined to form the dehydration drying system. The specific construction of the dewatering system is described below: in the drying system, the dryer 1 is a microwave paddle dryer, the heat exchanger 2 and the heat exchanger 3 are both spiral feeding heat exchangers, and the heat exchanger 4 is a solid-solid material conveying heat exchanger.
Steam output from a steam outlet 6 of the microwave paddle dryer is introduced into the spiral feeding heat exchanger 2 through a steam inlet 17 to exchange heat with calcium chloride dihydrate, and the steam is condensed and flows out through a material outlet 15 to be recycled. Cooling water of the microwave transmitter 5 enters the spiral feeding heat exchanger 3 through the inlet 13, is cooled and then flows back to the microwave transmitter 5 through the outlet 14, and the circulation is carried out. 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, and is conveyed to the microwave blade 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 barrel 51 of the solid-solid material conveying heat exchanger through the inlet 8, is cooled and moves to the outlet 10 to enter a packaging bag under the spiral pushing. The cold material calcium chloride dihydrate enters a material cylinder 52 of the solid-solid material conveying heat exchanger from a material inlet 9, is heated and simultaneously moves to a material outlet 7 under the pushing of a screw, and then enters the self-heating paddle type dryer to start dehydration. After dehydration, the water content of the calcium chloride dihydrate is reduced from 23 percent to 5.6 percent. And the waste heat recovery is utilized, so that the energy consumption is reduced by about 39%.
Example four:
this example is the dewatering and drying of a microwave drum scraper dryer (fig. 2) in combination with a screw feed heat exchanger (fig. 3). The top of cylinder scraper blade desiccator is equipped with microwave transmitter 5, and cold material 50% calcium chloride solution gets into spiral feeding heat exchanger through entry 9, is heated after the heat absorption and gets into material pond 29 of microwave cylinder scraper blade desiccator through export 7, and cylinder 24 rotates, and its surface adhesion's feed liquid is heated the dehydration, and microwave 5 radiates the material on cylinder surface and promotes the dehydration. The dried material is peeled off the roller by the scraper 23, enters the spiral feeding heat exchanger through the feeding hole 8, is collected and packaged at the discharging hole 10 after heat exchange and cooling, and the dehydration and drying are finished. The temperature of the roller is 160 ℃, and the solid calcium chloride obtained after the 50 percent calcium chloride solution is dehydrated contains about 4 percent of water. The same solution was dried using a conventional roller scraper dryer without microwave-assisted heating, the roller temperature was also 160 ℃, and the resulting solid calcium chloride contained about 22% water, i.e., calcium chloride dihydrate, not anhydrous calcium chloride.
Example five:
in this embodiment, the drying machine is an auto-heating type roller scraper dryer (as shown in fig. 3), the inner wall of the roller 24 is provided with a U-shaped electric heating rod 28, 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 the calcium chloride after dehydration is 6.3% by mass.
Example six:
in this embodiment, the microwave paddle dryer is self-heating (as shown in fig. 4), a heat source 281 of a tungsten iodine lamp is installed in the heating chamber 40, microwaves radiate calcium chloride dihydrate as a material through the feeding port 5, the shaft 39 is a solid shaft, and the temperature of the chamber 40 is stabilized at 160 ℃. The paddle 42 stirs the calcium chloride dihydrate to promote heat absorption and simultaneously pushes the calcium chloride dihydrate to move towards the outlet 10, and after dehydration, the calcium chloride dihydrate flows out of the outlet 10 to be bagged. The water content of the calcium chloride is reduced from 23 percent to 5.2 percent.
Example 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 fused salt are arranged in a heating cavity 40 of the self-heating microwave rake dryer, the material cylinder and the material are heated by the hot medium fused salt, and a microwave transmitter 5 emits 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 material heat exchange and movement, and simultaneously flows out through the outlet 19 and then enters the material barrel 51 of the solid-solid material conveying and heat exchanging machine through the inlet 8. the cold calcium chloride dihydrate enters the solid-solid material conveying and heat exchanging machine through the inlet 9, exchanges heat in the material barrel 52, pushes the material to move to the outlet 7 through the spiral sheets 301, and then enters the self-heating microwave rake dryer through the inlet 18 for dehydration. The dehydrated hot material enters the material barrel 51 through the inlet 8 to exchange heat with the cold material in the material barrel 52, and the spiral sheet 301 pushes the material to move to the outlet 10 to flow out for bagging. The heat exchange chamber 46 of the solid-solid material conveying heat exchanger is filled with heat-conducting silicone oil, the temperature is stabilized at 150 ℃, and after the calcium chloride dihydrate is dehydrated, the water content mass fraction is reduced from 23% to 5.7%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A dewatering and drying system characterized by: 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, the hot material dehydrated and dried by the dryer exchanges heat with the cold material which is not dried through the heat exchanger, and the steam generated by the dehydration and drying of the dryer exchanges heat with the cold material which is not dried through the heat exchanger.
2. A dewatering and drying system according to claim 1, further comprising: the dryer is selected from a microwave rake dryer, a microwave roller scraper dryer or a microwave paddle dryer.
3. A dryer according to claim 2, wherein: 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 on the top or a steam cover of the conventional rake dryer, the conventional roller scraper dryer or the conventional paddle dryer, and microwave radiation is carried out on the dried material.
4. A dryer according to claim 3, wherein: 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 conventional roller scraper dryer and the microwave roller scraper dryer are internally provided with a heater heating roller; the material barrel of the conventional paddle dryer and the microwave paddle dryer is externally provided with a heating cavity, and a heater is arranged in the heating cavity to heat the material barrel.
5. A dewatering and drying system according to claim 1, further comprising: the heat exchanger is selected from a spiral feeding heat exchanger, the spiral feeding heat exchanger is provided with a hollow shaft and a spiral blade, the spiral blade is fixed on the hollow shaft, and cold fluid enters the shaft center to exchange heat with external materials; the material barrel is also arranged, the barrel wall is provided with fixed fins which promote heat transfer, and the shaft and the propeller blade are placed in the material barrel and driven to rotate by the motor; the material barrel is provided with 1 material inlet and outlet respectively, the outer side of the material barrel is provided with a cavity for containing heat exchange fluid, and the cavity is provided with 1 material inlet and outlet respectively.
6. A dewatering and drying system according to claim 5, further comprising: the heat exchanger is selected from a solid-solid material conveying heat exchanger, the solid-solid material conveying heat exchanger comprises 2 spiral conveyors, and the 2 spiral conveyors are connected and fixed into a whole; 2 screw conveyors are respectively provided with 1 material cylinder, and 2 material cylinders are respectively provided with 1 material inlet and 1 material outlet; the wall of each of the 2 material cylinders is provided with a fin; the 2 screw conveyors are respectively provided with 1 shaft with a screw plate, and the screw plate and the shaft are placed in the material barrel and driven by a motor to rotate; the outside of 2 fixed integrative screw conveyer is equipped with the heat conductor and connects or is equipped with a heat conductor cavity, and this cavity has 1 material mouth.
7. A microwave dryer as claimed in claim 3, wherein: the microwave feeding port is provided with a microwave transmitter, cooling water of the microwave transmitter enters a heat exchanger to exchange heat with the cold materials which are not dried, the cooling water flows back to the microwave transmitter after being cooled, the cooling water is recycled, waste heat is recovered, and the cold materials which absorb heat enter a dryer to be dehydrated or enter another heat exchanger again.
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