CN113639533A - Low pressure superheated steam drying system and method - Google Patents
Low pressure superheated steam drying system and method Download PDFInfo
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- CN113639533A CN113639533A CN202110992838.3A CN202110992838A CN113639533A CN 113639533 A CN113639533 A CN 113639533A CN 202110992838 A CN202110992838 A CN 202110992838A CN 113639533 A CN113639533 A CN 113639533A
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- 238000001035 drying Methods 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 40
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 238000009835 boiling Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000007602 hot air drying Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000009777 vacuum freeze-drying Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000004108 freeze drying Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000007603 infrared drying Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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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 low pressure superheated steam drying system and method comprising: the drying bin comprises a heating device for heating the material and heating the water vapor evaporated from the material to form superheated steam; the heat pump group is used for exchanging heat with the steam discharged by the drying bin to recover heat energy and exchanging heat with return water of the heating device to output heated water; a hot water tank that supplies initial hot water to the heating device and then continuously supplies the heating hot water supplied from the heat pump group to the heating device; the vacuum device comprises a vacuum pump set used for maintaining a low-pressure environment in the drying bin so that the temperature of the corresponding water is reduced by boiling and evaporating. According to the low-pressure superheated steam drying system, the temperature of the condensed water generated by low-temperature drying is low, the heat energy emission to the environment is reduced, the system is more energy-saving and environment-friendly, meanwhile, the system is also suitable for heat-sensitive materials, the drying speed is high, and the efficiency is higher.
Description
Technical Field
The invention relates to steam drying of materials, in particular to a low-pressure superheated steam drying system and method.
Background
The existing drying technology comprises hot air drying, spray drying, fluidized bed drying, flash evaporation drying, infrared drying, microwave drying, vacuum freeze drying and the like. Particularly in the food industry, the drying modes mainly comprise vacuum freeze drying and hot air drying.
Vacuum freeze drying, freeze drying for short, is to freeze food, medicine and other material below the eutectic point temperature to change the water content into solid ice, and to sublimate the ice directly into water vapor in vacuum environment to reach the drying effect. Figure 1 shows that the vacuum drying storehouse body of a prior art freeze drying equipment, according to the volume of this storehouse body, can once only send into the storehouse body with the material of corresponding quantity and carry out vacuum drying, and whole materials cool down through quick-freeze tunnel, make the temperature of material be less than its eutectic point, then adopt vacuum drying technology, directly sublimate into the gaseous state rapid evaporation with the moisture in the material from solid-state. The formed freeze-dried product is spongy, has no drying shrinkage, good rehydration property and extremely low moisture content, maintains the original structural performance and nutritional ingredients of the product, and can be preserved and transported for a long time at normal temperature after being correspondingly packaged. However, vacuum freeze-drying has low heat transfer efficiency in a vacuum environment, a slow drying rate, and a long process time, and thus, the drying cost is relatively high.
The hot air drying is carried out in the environment of normal pressure, the fresh air is heated through a heat pump or a steam heat exchanger, the hot air is used as a drying medium, the wet heat exchange is carried out with the material in a natural or forced convection circulation mode, and the moisture on the surface of the material, namely water vapor, is diffused to the air flow main body through an air film on the surface. Meanwhile, as a result of the vaporization of the surface of the material, a moisture gradient difference is generated between the interior and the surface of the material, and the moisture in the interior of the material is diffused to the surface in a vapor state or a liquid state, so that the aim of drying the material is fulfilled. However, the hot air drying has high unit energy consumption, the exhausted waste gas contains a large amount of latent heat of steam, which is difficult to recover at useful temperature, the sealing performance of the equipment is poor, the heat energy overflows in the drying process, and the damage to workers is large.
The superheated steam drying has the advantages of energy conservation, high heat transfer efficiency, single drying medium, no mass transfer resistance, good quality of dried products, good safety and the like. However, the drying temperature of the superheated steam under normal pressure or high pressure is high, and is not suitable for heat-sensitive materials. The low-pressure superheated steam drying maintains the low-pressure environment of the drying bin through the vacuum system, reduces the evaporation temperature of water, is suitable for thermosensitive materials, and avoids the defects. However, the existing low-pressure superheated steam drying system uses a condenser for heat exchange, cannot fully recycle latent heat of steam discharged from a drying bin, and is high in energy consumption waste.
For example, the chinese patent application No. 201911172792, X shown in fig. 1A discloses a continuous low-pressure superheated steam drying apparatus, which includes a drying chamber 20, a steam upper conduit 8, a steam lower conduit 13, a condenser 1, a liquid pressurizer 4, a steam generator 6, a steam distributor 14, a motor 2, a circulating partition conveyor belt 7, a front dynamic transport elbow 12, a rear dynamic transport elbow 15, an air drying fan 16, a pressure pump 10, and a temperature control box 11. The drying chamber 20 is connected to the input of the condenser 1 by means of a steam upper conduit 8 for introducing superheated steam absorbing moisture from the material into the condenser. The liquid booster 4 is used for providing pressure for the non-condensable gas and the condensed water output by the condenser 1, so that the steam which is not cooled to form liquid water is discharged into the atmosphere, and the condensed water is conveyed to the steam generator 6, the steam generator 6 is used for conveying the condensed water to the steam distributor 14 at the bottom of the drying chamber 20, the steam distributor 14 is used for outputting superheated steam in the drying chamber 20, and the steam output end of the drying chamber 20 is used for guiding the superheated steam which absorbs the moisture in the material into the condenser 1; the drying chamber 20 is provided with a pressure pump 10 for maintaining the drying chamber 5 in a low pressure state.
For example, chinese patent application No. 201610694300.3 shown in fig. 1B discloses a low-pressure superheated steam drying system, which includes a steam generator 1, a steam heater 2, a temperature control device 3, a drying box 4, a temperature sensor 5, a product to be dried 6, a tray 7, a steam outlet 8, a steam distributor 9, a steam passage 10, a heater 11, a condenser 12, a water ring vacuum pump 13, a noncondensable gas and condensed water outlet 14, an upper outlet 15, and a lower outlet 16. And a tail gas outlet is formed in the top of the drying box 4 and connected with the condenser for leading superheated steam absorbing moisture in the material into the condenser 12. After the condensed water and the non-condensable gas generated by the condenser 12 are discharged from the same outlet 14, the condensed water is discharged from a lower outlet 16 and is discharged into the steam generator 1, the non-condensable gas is discharged from an upper outlet 15 through a water ring vacuum pump 13, and the system is in a negative pressure state through a condensing system.
The low-pressure superheated steam drying systems disclosed in the patent applications 201911172792 and 201610694300.3 have complex equipment and process, adopt a condenser for heat exchange, cannot fully recycle the latent heat of residual steam discharged by the drying box 4, and have limited energy-saving effect.
Disclosure of Invention
The present invention is directed to overcoming the disadvantages of the prior art and providing a system and method for drying superheated steam at low pressure to solve the above problems in the prior art.
According to one aspect of the present invention, there is provided a low pressure superheated steam drying system comprising:
the drying bin comprises a heating device for heating the material and heating the water vapor evaporated from the material to form superheated steam;
the heat pump group is used for exchanging heat with the steam discharged by the drying bin to recover heat energy and exchanging heat with return water of the heating device to output heated water;
a hot water tank that supplies initial hot water to the heating device and then continuously supplies the heating hot water supplied from the heat pump group to the heating device;
the vacuum device comprises a vacuum pump set used for maintaining a low-pressure environment in the drying bin so that the temperature of the corresponding water is reduced by boiling and evaporating.
The heat pump unit comprises a compressor, a condensation evaporator connected between the compressor and a steam exhaust pipe of the drying bin, and a condenser and a subcooler connected between the compressor and the hot water tank.
The heating device comprises heating plates which are arranged in a stacked mode, the water inlet end of each heating plate is connected with the water outlet end of the hot water tank, and the water outlet end of each heating plate is connected with the heat pump set.
The temperature of the heated hot water after heat exchange is 80 ℃.
The absolute pressure of the drying chamber is 3000 Pa.
The drying bin further comprises a continuous feeding device and a continuous discharging device which are respectively arranged at the feeding end and the discharging end of the bin body.
The drying bin further comprises a continuous feeding device and a continuous discharging device which are arranged in the bin body.
The continuous feeding device and the continuous discharging device comprise transition bins arranged outside the bin bodies.
According to another aspect of the present invention, there is provided a low pressure superheated steam drying method comprising the steps of:
a. vacuumizing the drying bin to a set vacuum degree through a vacuum pump set;
b. hot water is provided for a heating device in the drying bin through a hot water tank;
c. heat exchange is carried out on steam discharged from the drying bin through a heat pump unit to recover heat energy, and return water of the heating device is subjected to heat exchange to output heated water;
d. and continuously supplying the heated hot water output by the heat pump set to the hot water tank.
The absolute pressure of the drying bin is 3000Pa, and the temperature of the circulating water after heat exchange is 80 ℃.
According to the low-pressure superheated steam drying system and method, the low-pressure environment of the bin body is maintained through the vacuum system, so that the temperature of corresponding water boiling evaporation is reduced, latent heat is absorbed through the heat pump unit, and the utilization efficiency of energy is improved. Because the temperature of the condensed water generated by low-temperature drying is low, the heat energy emission to the environment is reduced, and therefore, the energy is saved and the environment is protected. In addition, only superheated steam is a heat transfer medium in the drying bin, mass transfer resistance is avoided, the drying speed of the materials is accelerated, and the production efficiency is higher.
Drawings
The invention may be better understood by describing embodiments thereof in conjunction with the following drawings, in which:
FIG. 1A is a schematic diagram showing a prior art low pressure superheated steam drying system.
FIG. 1B is a schematic diagram showing another prior art low pressure superheated steam drying system.
Fig. 2 is a schematic diagram showing a low pressure superheated steam drying system according to the present invention.
Fig. 3 is a schematic diagram illustrating a drying chamber of the low pressure superheated steam drying system of fig. 2.
Fig. 4A is a schematic diagram showing an internal structure of a feeding end of the drying bin shown in fig. 3.
Fig. 4B is a schematic view showing an internal structure of a discharging end of the drying silo shown in fig. 3.
Fig. 5 is a schematic view showing a structure of a heating device inside the drying compartment shown in fig. 4A.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below with reference to specific embodiments of the present invention and accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a schematic diagram illustrating a low pressure superheated steam drying system according to the present invention. Referring to fig. 2, the low-pressure superheated steam drying system includes a vacuum pump group 1, a drying compartment 2, a heat pump group 4, and a hot water tank 3. Wherein, the vacuum pump set is used for maintaining a low-pressure environment in the drying bin; the drying bin comprises a heating device for heating the water vapor evaporated from the material to form superheated steam; the cold end of the heat pump group sucks the heat of the steam discharged from the drying bin and outputs heated hot water through the hot end of the heat pump group; the hot water tank is used for supplying hot water to the heating device, return water of the heating device flows back to the hot water tank after being heated by the hot end of the heat pump group, and the returned circulating water is continuously supplied to the heating device, so that the temperature of the heating device in the drying bin can be maintained, and the circulating water can be used as a heat source for generating superheated steam.
Specifically, the vacuum pump unit 1 first vacuums the drying chamber 2 to a low-pressure environment, for example 3000Pa, so as to keep the heat transfer medium in the chamber uniform and the environment in the chamber stable. At the same time, the hot water tank 3 is heated by an initial heat source (not shown) so that the temperature of the water stored therein reaches, for example, 80 degrees celsius to form hot water, and the hot water is introduced into the drying compartment 2 through a pipe to heat the heating plate of the heating device in the compartment. The material to be dried is dehydrated under the heating of the heating plate to generate steam of about 24 ℃, and the steam is discharged out of the drying bin through the steam exhaust pipe and sent to the heat pump group 4. The heat pump unit 4 includes a compressor 41, a condensing evaporator 42 connected between the compressor and a steam exhaust pipe of the drying compartment, and a condenser 43 and a subcooler 44 connected between the compressor and the hot water tank. Wherein, the compressor 41 absorbs heat energy with lower temperature from the steam discharged from the steam exhaust pipe of the drying chamber 2 through the condensing evaporator 42 during operation, and discharges the condensed water to the outside. Then, the lower temperature heat energy is converted into higher temperature heat energy by the compressor and the condenser 43, and the heat energy is released to the return water of the heating device to be continuously supplied to the hot water tank 3 as heated hot water, so that the hot water stored inside the hot water tank 3 is always maintained at about 80 degrees celsius, for example, and heat is continuously supplied to the heating plate inside the drying compartment. The condenser 43 and the subcooler 44 adopt a mode of countercurrent heat exchange between the refrigerant and water, return water recovered from a heating plate of the heating device of the drying bin 2 is subjected to heat exchange through the cooler 44, then flows into the condenser 43 for heat exchange, and is sent into the hot water tank 3, so that the purposes of recovering a low-temperature heat source from the drying bin, preparing a high-temperature heat source and then sending into the drying bin are achieved through circulating evaporation heat absorption and condensation heat release, and the drying process of the material is more energy-saving and environment-friendly.
Fig. 3 is a schematic view showing a drying chamber of the low pressure superheated steam drying system shown in fig. 1, and fig. 4A is a schematic view showing an inlet end of the drying chamber shown in fig. 3. Referring to fig. 3 and 4 in combination, the drying chamber 30 includes a feed end 31 and a discharge end 32. A continuous feeding device 311 and a continuous discharging device 321 are respectively arranged on two sides of the feeding end 31 and the discharging end 32, and the material tray loaded with the material is fed into the bin 30 through the feeding device 311. The interior of the bin 30 is provided with a continuous feeding device 33, a continuous discharging device, and a drying and heating device 34, which includes a plurality of stacked heating plates 341.
As shown in fig. 4A, the continuous feeding device 311 includes a transition bin and a conveying mechanism (not shown) disposed inside the transition bin. The transition bin is arranged to be an airtight structure, and vacuum isolating mechanisms are arranged in front and at the back of the transition bin, for example, so that pressure in the drying bin is prevented from leaking. The loading device 33 is, for example, a lifting device, and includes, for example, a lifting table 331, a linear bearing mechanism for supporting the lifting table 331 to move vertically, and a movable rod 333. The lifting device further comprises a servo motor and a speed reducer 334, the lifting chain 336 is driven by the driving shaft 335, and the lifting platform 331 is controlled to move up and down by the linkage shaft 337. The drying and heating device 34 includes a plurality of heating plates 341 stacked in layers. When the tray carrying the material to be processed is transferred from the feeding device 311 to the top surface of the elevating table 331, the tray may be pushed forward onto the heating plate 341 of the drying and heating device 34 by, for example, a feeding robot (not shown) of the elevating device. The lifting table 331 sends the tray on the table top to the first layer heating plate 341 of the drying and heating device 34, then continues the lifting action, and sends the subsequent tray to the second layer heating plate 341, and so on and operates circularly. The material fed into the drying and heating device 34 is dried and heated in the bin 30 for a predetermined time, and then finally discharged from the discharge end 32 of the drying bin. Because the discharging end 32 is provided with the discharging device 321 with a structure similar to that of the feeding device 311 of the feeding end 31, the materials can enter a packaging workshop for packaging through the discharging device 321 after the drying production is finished.
Fig. 4B is a schematic perspective view of the material discharge end 32 of the drying bin of fig. 3. With combined reference to fig. 3 and 4B, the continuous discharging device 321 also includes, for example, a transition bin and a conveying mechanism (not shown) disposed inside the transition bin. The transition bin is arranged to be an airtight structure, and vacuum isolating mechanisms are arranged in front and at the back of the transition bin, for example, so that pressure in the drying bin is prevented from leaking. The discharge device 35 is also arranged inside the discharge end 32 of the drying silo and comprises, for example, a lifting device comprising a lifting table 61, a linear bearing mechanism 62 for supporting the lifting table 61 in a vertical movement and a movable rod 63. The lifting device further comprises a servo motor and a speed reducer 64, and the lifting chain 66 can be driven by a driving shaft and the lifting platform 61 can be controlled to move up and down by a linkage shaft 67. The lifting platform 61 receives the material tray from a heating plate 341 of the drying and heating device 34 from top to bottom or from bottom to top through the material tray receiving mechanisms 81 and 82, then lowers to the bottom layer and feeds the material tray into a discharging device 321 through a conveying device 50, wherein the discharging device 321 comprises a transition bin 52 which is arranged in an airtight mode, and finally, the material tray is discharged from a discharging opening 54. Then, the lifting table 61 continues to lift and move, and continuously feeds the tray received from the drying and heating device 34 to the discharging device 321, and so on, and operates in a cycle.
As shown in fig. 4A and 4B, according to the low-pressure superheated steam drying system of the present invention, since the drying chamber is provided with the continuous feeding device and the continuous discharging device at the feeding end and the discharging end of the chamber body, respectively, and the chamber body is provided with the continuous feeding device and the discharging device inside, the continuous production situation can be realized, the material rotation frequency can be reduced, the production efficiency of the system can be improved, and the labor cost can be reduced. Moreover, because the continuous feeding device and the continuous discharging device of the drying bin are respectively provided with the airtight transition bin capable of receiving and sending out the charging tray, the contact time of the processed materials and the outside air is reduced, and the quality and the drying degree of the product are improved.
Fig. 5 is a schematic view showing a structure of a heating device inside the drying compartment shown in fig. 4A. Referring to fig. 5 and 4A in combination, circulating water is circulated through the water inlet 347 and water outlet 348 to heat the heating plate 341 to maintain the temperature, and the tray is pushed into the heating plate 341 through the inlet end 31 and finally discharged through the outlet end 32.
The low-pressure superheated steam drying method comprises the following steps:
a. vacuumizing the drying bin to a set vacuum degree through a vacuum pump set;
b. hot water is provided for a heating device in the drying bin through a hot water tank;
c. heat exchange is carried out on steam discharged from the drying bin through a heat pump unit to recover heat energy, and return water of the heating device is subjected to heat exchange to output heated water;
d. and continuously supplying the heated hot water output by the heat pump set to the hot water tank.
The absolute pressure of the drying bin is 3000Pa, and the temperature of the circulating water after heat exchange is 80 ℃.
Various changes and modifications may be suggested to one skilled in the art based on the teachings herein, but are within the scope of the appended claims.
Claims (10)
1. A low pressure superheated steam drying system comprising:
the drying bin comprises a heating device for heating the material and heating the water vapor evaporated from the material to form superheated steam;
the heat pump group is used for exchanging heat with the steam discharged by the drying bin to recover heat energy and exchanging heat with return water of the heating device to output heated water;
a hot water tank that supplies initial hot water to the heating device and then continuously supplies the heating hot water supplied from the heat pump group to the heating device;
the vacuum device comprises a vacuum pump set used for maintaining a low-pressure environment in the drying bin so that the temperature of the corresponding water is reduced by boiling and evaporating.
2. The system of claim 1, wherein the heat pump bank comprises a compressor, a condenser evaporator connected between the compressor and a vapor vent line of the drying chamber, and a condenser and subcooler connected between the compressor and the hot water tank.
3. The system of claim 1, wherein the heating device comprises heating plates arranged in a stack, a water inlet end of the heating plates is connected with a water outlet end of the hot water tank, and a water outlet end of the heating plates is connected with the heat pump unit.
4. The system of claim 3, wherein the heated hot water after heat exchange has a temperature of 80 ℃.
5. The system of claim 1, wherein the drying chamber has an absolute pressure of 3000 Pa.
6. The system of claim 1, wherein the drying silo further comprises a continuous inlet means and a continuous outlet means disposed at the inlet end and the outlet end of the silo body, respectively.
7. The system of claim 6, wherein the drying silo further comprises a continuous feeding device and a continuous discharging device disposed within the silo body.
8. The system of claim 6, wherein the continuous in-feed and continuous out-feed devices comprise a transition bin disposed outside the bin body.
9. A low-pressure superheated steam drying method comprises the following steps:
a. vacuumizing the drying bin to a set vacuum degree through a vacuum pump set;
b. hot water is provided for a heating device in the drying bin through a hot water tank;
c. heat exchange is carried out on steam discharged from the drying bin through a heat pump unit to recover heat energy, and return water of the heating device is subjected to heat exchange to output heated water;
d. and continuously supplying the heated hot water output by the heat pump set to the hot water tank.
10. The method of claim 9, wherein the absolute pressure of the drying chamber is 3000Pa, and the temperature of the circulating water after heat exchange is 80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110992838.3A CN113639533A (en) | 2021-08-27 | 2021-08-27 | Low pressure superheated steam drying system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110992838.3A CN113639533A (en) | 2021-08-27 | 2021-08-27 | Low pressure superheated steam drying system and method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130125453A (en) * | 2012-05-09 | 2013-11-19 | 한국에너지기술연구원 | Dryer using of heat pump high frequence with vacuum |
| CN105066602A (en) * | 2015-09-02 | 2015-11-18 | 淮海工学院 | Double-drying-chamber multifunctional drying device |
| CN105157358A (en) * | 2015-09-15 | 2015-12-16 | 山东天力干燥股份有限公司 | Energy-saving vacuum drying technique and system |
| CN107594583A (en) * | 2017-09-26 | 2018-01-19 | 南昌航空大学 | A kind of energy-efficient drying device of fruits and vegetables low-pressure superheated steam and method |
| CN211625879U (en) * | 2020-02-26 | 2020-10-02 | 浙江星菜农业科技有限公司 | Continuous processing type freeze drying system |
| CN213238304U (en) * | 2020-09-08 | 2021-05-18 | 广州晟启能源设备有限公司 | Heat pump heat recovery driving vacuum horizontal thin layer drying system |
-
2021
- 2021-08-27 CN CN202110992838.3A patent/CN113639533A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130125453A (en) * | 2012-05-09 | 2013-11-19 | 한국에너지기술연구원 | Dryer using of heat pump high frequence with vacuum |
| CN105066602A (en) * | 2015-09-02 | 2015-11-18 | 淮海工学院 | Double-drying-chamber multifunctional drying device |
| CN105157358A (en) * | 2015-09-15 | 2015-12-16 | 山东天力干燥股份有限公司 | Energy-saving vacuum drying technique and system |
| CN107594583A (en) * | 2017-09-26 | 2018-01-19 | 南昌航空大学 | A kind of energy-efficient drying device of fruits and vegetables low-pressure superheated steam and method |
| CN211625879U (en) * | 2020-02-26 | 2020-10-02 | 浙江星菜农业科技有限公司 | Continuous processing type freeze drying system |
| CN213238304U (en) * | 2020-09-08 | 2021-05-18 | 广州晟启能源设备有限公司 | Heat pump heat recovery driving vacuum horizontal thin layer drying system |
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Application publication date: 20211112 |