CN114136079A - Drying system and drying method - Google Patents
Drying system and drying method Download PDFInfo
- Publication number
- CN114136079A CN114136079A CN202111481368.0A CN202111481368A CN114136079A CN 114136079 A CN114136079 A CN 114136079A CN 202111481368 A CN202111481368 A CN 202111481368A CN 114136079 A CN114136079 A CN 114136079A
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- China
- Prior art keywords
- air
- drying
- drying system
- gas
- gas recovery
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides a drying system and a drying method, wherein the drying system comprises: a primary drying system and a gas recovery system; the primary drying system includes: an air treatment device; a spray drying device in communication with the air treatment device; a separation device in communication with the spray drying device; the water curtain dust removal device is communicated with the separation device; and the gas recovery system is respectively communicated with the water curtain dust removal device and the air treatment device to form a closed circulating drying system. According to the embodiment of the invention, a gas recovery system is added, and the gas recovery system is communicated with the gas outlet side and the gas inlet side of the primary drying system, so that the waste gas of the primary drying system can be recycled; and the gas recovery system and the primary drying system form a closed circulating system, so that the amount of gas discharged to the air is close to zero, and the complex waste gas treatment cost is saved.
Description
Technical Field
The invention relates to the technical field of drying, in particular to a drying system and a drying method.
Background
Spray drying is a method of applying systematic technology to material drying, in the process of contacting the material with hot air in a drying chamber, the moisture is quickly vaporized, and then the dried product is obtained. The method can directly dry the solution or emulsion into powder or granular product, and can omit the procedures of evaporation, pulverization, etc.
In the prior art, the waste gas discharged by the primary drying system needs to be treated by a complex treatment process to meet the emission requirement, and the problems of complex waste gas treatment process, high standard emission cost and the like exist.
Disclosure of Invention
The invention provides a drying system and a drying method, which can be used for removing moisture in waste gas discharged by primary drying and then sending the waste gas back to the primary drying system, thereby realizing the cyclic utilization of air and the near-zero emission of air in the whole production process.
An aspect of the present invention provides a drying system, including: a primary drying system and a gas recovery system;
the primary drying system includes:
an air treatment device;
a spray drying device in communication with the air treatment device;
a separation device in communication with the spray drying device; and
the water curtain dust removal device is communicated with the separation device;
and the gas recovery system is respectively communicated with the water curtain dust removal device and the air treatment device to form a closed circulating drying system.
Preferably, the gas recovery system comprises one or more stages of heat pumps.
Preferably, the gas recovery system is in communication with the air treatment device via a first delivery device.
Preferably, the first conveying device is a centrifugal fan.
Preferably, the air treatment device comprises a coarse medium-efficiency filter, a steam heating device, an electric heating device and a high-efficiency filter which are communicated in sequence.
Preferably, the separation means comprises and/or a multi-stage cyclonic separator.
Preferably, the separation device and the water curtain dust removal device are communicated through a second conveying device.
Preferably, the second conveying device is a centrifugal fan.
According to one aspect of the present invention, there is provided a drying method comprising:
s10: filtering and heating the air medium;
s20: atomizing the air medium, and fully mixing the air medium with the material to realize heat exchange;
s30: separating the material from the air medium;
s40: dedusting an air medium;
s50: after dehumidifying and drying the air medium, the air medium carries its own heat energy to step S10 again.
The invention has the advantages and positive effects that: according to the embodiment of the invention, the gas recovery system is added, and the gas recovery system is communicated with the gas outlet side (the water curtain dust removal device) and the gas inlet side (the first conveying device) of the primary drying system, so that the waste gas of the primary drying system is recycled; and the gas recovery system and the primary drying system form a closed circulating system, so that the amount of gas discharged to the air is close to zero, and the complex waste gas treatment cost is saved.
Further, the gas recovery system comprises one or more stages of heat pumps, and the exhaust gas is heated to achieve the dehumidification effect. The gas dried by the gas recovery system has heat energy which can be reapplied to the spray drying device, so that a large amount of heat energy is saved, the energy consumption for waste gas treatment is reduced to zero, and the energy consumption for production is reduced by more than 30%.
According to the embodiment of the invention, the moisture in the waste gas after primary drying and discharging is removed and then the waste gas is sent back to the drying system, and the waste gas is filtered by using the coarse medium-efficiency filter and the high-efficiency filter in the primary drying system, so that the air recycling and the zero-emission and near-zero emission in the whole production process are realized.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
FIG. 1 shows a schematic structural diagram of a drying system according to an embodiment of the invention; as shown in fig. 1, the drying system includes a primary drying system 10 and a gas recovery system 20; the primary drying system 10 comprises a first conveying device 11, an air treatment device 12, a spray drying device 13, a separation device and a water curtain dust removal device 15 which are sequentially communicated; the gas recovery system 20 is respectively communicated with the water curtain dust removal device 15 and the first conveying device 11 to form a closed-cycle drying system.
In the embodiment of the present invention, air is conveyed to the air processing device 12 through the first conveying device 11, the air processing device 12 filters and heats normal temperature air, and then conveys the air to the spray drying device 13, the spray drying device 13 is configured to atomize the heated air so as to dry the material in the spray drying device 13, the air with dust particles after being atomized enters the water curtain dust removing device so as to remove the dust particles in the air, the air passing through the water curtain dust removing device enters the gas recovery system for drying due to carrying a large amount of water vapor, and the dried gas is conveyed to the air processing device 12 through the first conveying device 11 again.
In the prior art, the exhaust gas discharged from the primary drying system 10 needs to be treated by a complex treatment process to meet the emission requirement, and the problems of complex exhaust gas treatment process, high standard emission cost and the like exist.
In the embodiment of the invention, a gas recovery system is added, and the gas recovery system is communicated with the gas outlet side (the water curtain dust removal device 15) and the gas inlet side (the first conveying device 11) of the primary drying system, so that the waste gas of the primary drying system 10 is recycled; and the gas recovery system and the primary drying system form a closed circulating system, so that the amount of gas discharged to the air is close to zero, and the complex waste gas treatment cost is saved.
Further, the gas recovery system 20 includes one or more stages of heat pumps to heat the exhaust gas to achieve dehumidification. The gas dried by the gas recovery system has heat energy which can be reapplied to the spray drying device, so that a large amount of heat energy is saved, the energy consumption for waste gas treatment is reduced to zero, and the energy consumption for production is reduced by more than 30%.
In this embodiment, the first conveying device 11 is, for example, a centrifugal fan, and a first air inlet end 111 of the centrifugal fan is communicated with the gas recovery system 20, and a first air outlet end 112 is communicated with the air processing device 12 to convey air to the air processing device 12.
The air treatment device 12 comprises a coarse medium-efficiency filter 121, a steam heating device 122, an electric heating device 123 and a high-efficiency filter 124 which are communicated in sequence.
The coarse medium-efficiency filter 121 is communicated with the first air outlet end 112 of the first conveying device 11, and is used for primarily filtering the air conveyed by the first conveying device 11; the air filtered by the coarse medium-effect filter 121 enters the steam heating device 122 and the electric heating device 123 for heating; the heated air enters the spray drying device 13 after being further filtered by the high efficiency filter 124.
It is noted that the air dried by the gas recovery system 20 has its own heat energy, which can save a lot of energy in this step.
An air distributor 131 is disposed on the top of the spray drying device 13, the air distributor 131 is respectively communicated with the high-efficiency filter 124 and the cavity 132 of the spray drying device 13, the air filtered by the high-efficiency filter 124 enters the air distributor 131, and the air distributor 131 conveys the air filtered by the high-efficiency filter 124 to the cavity 132 of the spray drying device 13.
An atomizer 133 is also mounted on the top of the spray drying device 13, the atomizer 133 atomizing the air delivered to the interior of the chamber 132 of the spray drying device 13 via the air distributor 131.
The spray drying device 13 further comprises a first feeding port 134 and a first discharging port 135 which are communicated with the cavity 132 of the spray drying device 13, and the materials are conveyed to the inside of the cavity of the spray drying device 13 through the first feeding port 134. The material and the heated air enter the cavity 132 of the spray drying device 13 at the same time, and the two are fully mixed, so that the purpose of evaporation drying is achieved in a short time due to the large heat and mass exchange area, and the material can be dried quickly. After drying the material inside the cavity 132 of the spray drying device 13, the material is discharged from the first discharge opening 135.
The separating apparatus comprises a first cyclone 141 and a second cyclone 142 in communication.
The first cyclone separator 141 comprises a first cyclone separation chamber 1411, and a second material inlet 1412, a second material outlet 1413 and a second air outlet 1414 which are respectively communicated with the first cyclone separation chamber 1411, wherein the second material inlet 1412 is positioned at the side of the first cyclone separation chamber 1411 and is communicated with the first material outlet of the spray drying device 13, the second material outlet 1413 is positioned below the first cyclone separation chamber 1411, and the second air outlet 1414 is positioned at the top of the first cyclone separation chamber 411.
The second cyclone separator 142 comprises a second cyclone separation chamber 1421, and a third material inlet 1422, a third material outlet 1423 and a third air outlet 1424 which are respectively communicated with the second cyclone separation chamber 1421;
the third material inlet 1422 is located on the side of the second cyclone separation chamber 1421 and is communicated with the first cyclone separation chamber 1411, the third material outlet 1423 is located below the second cyclone separation chamber 1421, and the third air outlet 1434 is located at the top of the second cyclone separation chamber 1421.
The second material inlet 1411 of the first cyclone 141 is connected with the first material outlet 135 of the spray drying device 13, the material dried by the spray drying device 13 enters the separation device, the first cyclone 1411 is communicated with the second cyclone 1421, the heavier material is thrown to the inner wall of the first cyclone 141 and the second cyclone 142 and then falls downward, the heavier material is discharged through the second material outlet 1413 and the third material outlet 1423, and the gas is discharged through the second gas outlet 1414 and the third gas outlet 1424.
In the embodiment of the invention, the device further comprises a water curtain dust removal device 15, and the water curtain dust removal device 15 is communicated with the separation device.
Further, the water curtain dust removing device 15 is communicated with the separating device through a second conveying device 16, and the gas discharged from the separating device is conveyed to the water curtain dust removing device 15 through the second conveying device 16.
The water curtain dust removing device 15 includes a fourth air inlet 151, a fourth water inlet 152 (not shown), a fourth water outlet 153 and a fourth air outlet 154, the fourth inlet 151 is communicated with the second air outlet 1414 and the third air outlet 1424 of the separating device via the second conveying device 16, and the fourth water inlet 152 is used for connecting a water source and conveying the water source to the inside of the water curtain dust removing device 15.
The gas discharged from the second gas outlet 1414 and the third gas outlet 1424 enters the water curtain dust removing device 15 through the second conveying device 16, dust in the air is removed through the water curtain dust removing device 15, the gas part is discharged through the fourth gas outlet 153, and the sewage is discharged through the fourth water outlet 152.
The air is discharged into the gas recovery system 20 through the fourth air outlet 153, dehumidified by the gas recovery system 20, enters the first conveying device 11, and is conveyed to the air treatment device 12 through the first conveying device 11, so that the air medium is recycled in the drying system.
In the embodiment of the invention, the dust remover is a cyclone separator, and after solid-gas separation, dust particles are carried by a gas part; selecting a water curtain dust remover for the gas carrying dust particles to remove the dust particles in the air; in view of the fact that the air passing through the water curtain dust remover cannot be directly conveyed to the heating device through the first conveying device due to the fact that the air contains a large amount of moisture, a heat pump is additionally arranged between the dust remover and the first conveying device to dehumidify the air containing a large amount of moisture.
The waste gas treatment process of the traditional spray drying system is complex, the emission cost after reaching the standard is very high, the embodiment of the invention removes the moisture in the waste gas which is subjected to primary drying and is discharged, and then the waste gas is sent back to the drying system, and the coarse medium-efficiency filter and the high-efficiency filter in the primary drying system are used for filtering the waste gas, so that the air recycling and the air near zero emission in the whole production process are realized.
The embodiment of the invention also provides a drying method, which comprises the following steps:
s10: filtering and heating the air medium;
s20: atomizing the air medium, and fully mixing the air medium with the material to realize heat exchange;
s30: separating the material from the air medium;
s40: dedusting an air medium;
s50: after dehumidifying and drying the air medium, the air medium carries its own heat energy to step S10 again.
In step S50, the air is dehumidified and dried by one or more stages of heat pumps.
According to the embodiment of the invention, the gas after primary drying is recovered, so that the amount of the gas discharged to the air is close to zero, and the complex waste gas treatment cost is saved.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (9)
1. A drying system, characterized by: the drying system includes: a primary drying system and a gas recovery system;
the primary drying system includes:
an air treatment device;
a spray drying device in communication with the air treatment device;
a separation device in communication with the spray drying device; and
the water curtain dust removal device is communicated with the separation device;
and the gas recovery system is respectively communicated with the water curtain dust removal device and the air treatment device to form a closed circulating drying system.
2. The drying system of claim 1, wherein: the gas recovery system includes one or more stages of heat pumps.
3. The drying system of claim 1, wherein: the gas recovery system is in communication with the air treatment device via a first delivery device.
4. The drying system of claim 3, wherein: the first conveying device is a centrifugal fan.
5. The drying system of claim 1, wherein: the air treatment device comprises a coarse medium-efficiency filter, a steam heating device, an electric heating device and a high-efficiency filter which are sequentially communicated.
6. The drying system of claim 1, wherein: the separation device comprises an cyclone separator or a multi-stage cyclone separator.
7. The drying system of claim 1, wherein: the separation device is communicated with the water curtain dust removal device through a second conveying device.
8. The drying system of claim 7, wherein: the second conveying device is a centrifugal fan.
9. A method of drying characterized by: the method comprises the following steps:
s10: filtering and heating the air medium;
s20: atomizing the air medium, and fully mixing the air medium with the material to realize heat exchange;
s30: separating the material from the air medium;
s40: dedusting an air medium;
s50: after dehumidifying and drying the air medium, the air medium carries its own heat energy to step S10 again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111481368.0A CN114136079A (en) | 2021-12-06 | 2021-12-06 | Drying system and drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111481368.0A CN114136079A (en) | 2021-12-06 | 2021-12-06 | Drying system and drying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114136079A true CN114136079A (en) | 2022-03-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111481368.0A Pending CN114136079A (en) | 2021-12-06 | 2021-12-06 | Drying system and drying method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606034A (en) * | 2007-02-06 | 2009-12-16 | 犹德有限公司 | The dried dust shape particularly waits to input to the method and apparatus of the fuel of gasification installation |
| CN106166396A (en) * | 2016-07-12 | 2016-11-30 | 常州鼎高能源科技有限责任公司 | A kind of energy-saving closed cycle spray drying system |
| CN211771216U (en) * | 2019-12-23 | 2020-10-27 | 安琪酵母（伊犁）有限公司 | Drying device |
| CN112807723A (en) * | 2021-01-04 | 2021-05-18 | 中石化上海工程有限公司 | Spray drying tower tail gas heat recovery system |
| CN214130322U (en) * | 2021-06-28 | 2021-09-07 | 中国科学院大气物理研究所 | System for realizing zero emission of dry waste gas |
| CN214680070U (en) * | 2021-04-14 | 2021-11-12 | 无锡市秋田产业机械有限公司 | Exhaust gas circulation spray drying line |
-
2021
- 2021-12-06 CN CN202111481368.0A patent/CN114136079A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606034A (en) * | 2007-02-06 | 2009-12-16 | 犹德有限公司 | The dried dust shape particularly waits to input to the method and apparatus of the fuel of gasification installation |
| CN106166396A (en) * | 2016-07-12 | 2016-11-30 | 常州鼎高能源科技有限责任公司 | A kind of energy-saving closed cycle spray drying system |
| CN211771216U (en) * | 2019-12-23 | 2020-10-27 | 安琪酵母（伊犁）有限公司 | Drying device |
| CN112807723A (en) * | 2021-01-04 | 2021-05-18 | 中石化上海工程有限公司 | Spray drying tower tail gas heat recovery system |
| CN214680070U (en) * | 2021-04-14 | 2021-11-12 | 无锡市秋田产业机械有限公司 | Exhaust gas circulation spray drying line |
| CN214130322U (en) * | 2021-06-28 | 2021-09-07 | 中国科学院大气物理研究所 | System for realizing zero emission of dry waste gas |
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Application publication date: 20220304 |