CN111829324B - Heat pump drying system and method - Google Patents
Heat pump drying system and method Download PDFInfo
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- CN111829324B CN111829324B CN202010667508.2A CN202010667508A CN111829324B CN 111829324 B CN111829324 B CN 111829324B CN 202010667508 A CN202010667508 A CN 202010667508A CN 111829324 B CN111829324 B CN 111829324B
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- steam
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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
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
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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
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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
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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
- F26B25/04—Agitating, stirring, or scraping devices
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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
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a heat pump drying system and a method. The material produces wet steam through drying, the wet steam gets into steam compressor after the solid dust that contains in the scrubbing tower desorption steam carries out the intensification pressure, superheated steam that discharges by the compressor outlet removes behind the superheated steam saturator overheated and lets in spiral propelling movement disk dryer's heating disk cavity to the material heat drying, condensate water and noncondensable steam discharge into vapour and liquid separator and separate, wherein noncondensable gas is discharged the system after separating, and the condensate water supplies water to scrubbing tower and superheated steam saturator, retrieves its waste heat that contains simultaneously. The spiral propelling disk type dryer adopted by the system can adjust the layout of the heating disk and the spiral propelling blade structure according to the characteristics of materials to be dried, the heat transfer area is large, the materials are uniformly and stably stirred and conveyed, and meanwhile, the drying process is more efficient and energy-saving due to the coupling of the heat pump system.
Description
Technical Field
The invention belongs to the field of drying equipment, and particularly relates to a heat pump drying device.
Background
The drying process is a unit operation for gasifying moisture contained in materials by means of heat energy and reducing the moisture content of products, is widely applied to various industries such as chemical industry, food, medicine, agriculture and forestry and belongs to high-energy-consumption unit operation. With the increasing requirements of the human society on environmental protection and the increasing of energy prices, how to improve the drying efficiency and reduce the energy consumption in the process becomes the main research direction in the drying field. The heat pump technology is an energy-saving technology for increasing low-grade heat energy into high-grade heat energy by consuming part of reverse circulation net work. Therefore, the energy utilization rate of the drying process can be greatly improved by combining the heat pump technology with the drying process. The heat pump drying technology was patented in the united states earlier than 1950 and then rapidly popularized in the industrial field with its obvious energy saving advantages, more than 10% of drying devices in japan adopted the heat pump drying technology by the 20 th century 90 s, and accordingly, many patents in the prior art relate to the heat pump drying technology, such as CN108645196A, CN110487064A and the like.
Although heat pump drying is widely concerned about by people because of its own energy-saving advantage, the current heat pump drying system often has the defects such as complicated structure, low operating efficiency, and the desicator that heat pump drying system adopted simultaneously has that heat transfer area is little, the material is heated inhomogeneous, the dry product moisture content is unstable, drying efficiency low scheduling problem. The desicator and heat pump drying system with compact structure and high-efficient and stable operation is always the research direction of the engineering technicians.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a heat pump drying system and a heat pump drying method adopting a spiral pushing disc type dryer, so that the drying efficiency of materials is improved, and the energy consumption of the drying system is reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a heat pump drying system characterized by: the heat pump drying system comprises a spiral pushing disc type dryer, a driving motor, a frequency converter, a speed reducer, a gas-liquid separator, a gas washing tower, a steam compressor and a superheated steam saturator; establish wet material import, dry material export and wet steam outlet on the dry chamber barrel of spiral propelling movement disk dryer, wet steam outlet links to each other with scrubbing tower steam inlet, and scrubbing tower steam outlet links to each other with the vapor compressor import, and the vapor compressor export links to each other with superheated steam saturator steam inlet, and superheated steam saturator steam outlet links to each other with desiccator heating plate cavity entry, and desiccator heating plate cavity export links to each other with the vapour and liquid separator entry, and vapour and liquid separator establishes noncondensable gas export discharge noncondensable gas, establishes the comdensable water export and discharges the comdensable water, the comdensable water export divides two branches to supply water respectively to scrubbing tower and superheated steam saturator, and remaining condensate is through scrubbing tower outlet discharge system, has still connect the live steam pipeline on the pipeline that superheated steam saturator steam outlet and desiccator heating plate cavity entry link to each other.
Preferably, spiral propelling movement disk dryer includes drying chamber barrel, central transmission shaft, heating plate and spiral propelling movement scraper, the heating plate is fixed on drying chamber barrel, has hollow cavity, establishes the strengthening rib in, forms heating medium circulation flow channel simultaneously, spiral propelling movement scraper is fixed on central transmission shaft, the heating plate arranges with spiral propelling movement scraper is in turn, and spiral propelling movement scraper rotating plane is parallel with the heating plate surface, and spiral propelling movement scraper rotating plane sweeps the heating plate surface.
Preferably, the spiral pushing scraper adopts a double-helix structure in opposite directions, and the helix angle is 5-30 degrees.
Preferably, the heating plate is semicircular or three-quarter circular, and the heating plate is arranged on the lower half part of the drying cavity cylinder body or is oppositely and alternately arranged on the upper half part and the lower half part of the drying cavity cylinder body.
Preferably, the heating plates are connected in series or in parallel.
Meanwhile, the invention also provides a heat pump drying method, which is characterized in that: the heat pump drying system is adopted to dry wet materials, the wet materials continuously enter the drying system from a wet material inlet arranged on the spiral pushing disc type dryer, the wet materials continuously move towards a dry material outlet under the pushing action of the spiral pushing scraper, the wet materials are heated and dried by the heating disc in the moving process, the wet materials are discharged out of the drying system from the dry material outlet after the moisture content meets the drying requirement, the spiral pushing scraper simultaneously plays the roles of conveying and turning, the contact surface of the wet materials and the heating disc is continuously updated and uniformly heated under the turning action of the spiral pushing scraper, the wet steam is simultaneously discharged, the raw steam is provided for the heating disc cavity by a steam generating pipeline in the initial drying stage, the generated condensed water and the uncondensed water enter a gas-liquid separator for separation, the uncondensed water passes through the uncondensed water outlet discharging system, the condensed water is divided into two paths to respectively supply water to a gas washing tower and a superheated steam saturator, and discharging the residual condensed water out of the drying system through a water outlet of the gas washing tower, starting a steam compressor after the materials are heated to a specified temperature and generate wet steam, and simultaneously reducing or stopping the supplement of the generated steam according to the running condition of the system so as to ensure that the heat pump drying system continuously and stably runs.
Preferably, the operation condition of the drying system is adjusted by adjusting the spiral angle of the spiral pushing scraper, the central angle of the scraper, the disc distribution mode and the number of the heating discs and the rotating speed of the spiral pushing scraper.
The invention has the following beneficial effects:
1. the waste gas and waste heat in the drying process are recovered in a heat pump mode, the system is efficient and energy-saving, and the energy can be saved by 60-80% compared with the common drying process according to different properties of the dried materials.
2. Adopt spiral propelling movement disk desicator, unit volume heat transfer area is big, and the material is carried and is tumbled efficiently, and drying process is even more high-efficient, and the product moisture content is stable, and great heat transfer area can make the system move under less heat transfer difference in temperature simultaneously, improves heat pump system COP coefficient.
The method can be adjusted according to the properties of the dried materials, and determines appropriate equipment parameters, such as the spiral angle of a pushing scraper, the central angle of the scraper, the cloth disc distribution mode and quantity of a heating disc, the rotating speed of the pushing scraper and the like, so that various factors influencing the drying effect of the materials, such as the retention time of the materials in a dryer, the updating rate of the materials and a heating interface, the area of a steam diffusion interface and other parameters, can be independently adjusted, and the optimal combination is determined, so that the drying process is ensured to be carried out under the optimal condition.
Drawings
Fig. 1, a schematic diagram of a heat pump drying system.
Fig. 2 is a schematic view of a spiral propulsion disc type dryer with heating discs oppositely and alternately arranged.
Fig. 3, the blade is pushed against the double helix.
Detailed Description
In order to further explain the present invention, some embodiments of the present invention are given below in conjunction with the drawings of the specification, it should be noted that the following embodiments are only examples of the present invention under certain specific conditions and do not constitute a limitation of the present invention.
Example one
The invention discloses a heat pump drying system which mainly comprises a dryer and a heat pump system, wherein the adopted dryer is a spiral pushing disc type dryer, the spiral pushing disc type dryer comprises a drying cavity cylinder, a central transmission shaft, a heating disc and a spiral pushing scraper, the heating disc is fixed on the drying cavity cylinder, is provided with a hollow cavity body and is internally provided with reinforcing ribs, a heating medium circulating flow channel is formed at the same time, the spiral pushing scraper is fixed on the central transmission shaft, the heating disc and the spiral pushing scraper are alternately arranged, the rotating surface of the spiral pushing scraper is parallel to the surface of the heating disc, and the rotating surface of the spiral pushing scraper sweeps across the surface of the heating disc. The spiral pushing scraper adopts an opposite double-spiral structure, the spiral angle is 5 degrees, and the central angle of the scraper is 120 degrees. The heating plate is semicircular, and the heating plate thickness is 3cm, the heating plate is arranged at the lower half of drying chamber barrel, adopts parallel mode to connect. The diameter of the cylinder body of the dryer cavity is 0.8m, and the length of the cylinder body is 8 m. The drier is internally provided with 79 heating plates and 80 spiral pushing scrapers, and the total heat exchange area is about 39.7m2。
Establish wet material import, dry material export and wet steam outlet on the dry chamber barrel of spiral propelling movement disk dryer, wet steam outlet links to each other with scrubbing tower steam inlet, and scrubbing tower steam outlet links to each other with the vapor compressor import, and the vapor compressor export links to each other with superheated steam saturator steam inlet, and superheated steam saturator steam outlet links to each other with desiccator heating plate cavity entry, and desiccator heating plate cavity export links to each other with the vapour and liquid separator entry, and vapour and liquid separator establishes noncondensable gas export discharge noncondensable gas, establishes the comdensable water export and discharges the comdensable water, the comdensable water export divides two branches to supply water respectively to scrubbing tower and superheated steam saturator, and remaining condensate is through scrubbing tower outlet discharge system, has still connect the live steam pipeline on the pipeline that superheated steam saturator steam outlet and desiccator heating plate cavity entry link to each other.
Example two
A heat pump drying method adopts a spiral pushing disc type dryer disclosed by the invention to dry wet materials, the wet materials continuously enter a drying system from a wet material inlet arranged on the spiral pushing disc type dryer, the wet materials continuously move to a dry material outlet under the pushing action of a spiral pushing scraper, the wet materials are heated and dried by a heating disc in the moving process, the water content of the wet materials reaches the drying requirement and then is discharged out of the drying system from the dry material outlet, the spiral pushing scraper simultaneously plays the roles of conveying and turning, the contact surface of the wet materials and the heating disc is continuously updated and uniformly heated under the turning action of the spiral pushing scraper, simultaneously wet steam is discharged, raw steam is provided to a cavity of the heating disc by a raw steam pipeline in the initial drying stage, the generated condensed water and the non-condensed water are separated in a gas-liquid separator and are not condensed by the non-condensed-steam outlet discharge system, the condensed water is divided into two paths of water which are respectively supplied to a gas washing tower and a superheated steam saturator, and discharging the residual condensed water out of the drying system through a water outlet of the gas washing tower, starting a steam compressor after the materials are heated to a specified temperature and generate wet steam, and simultaneously reducing or stopping the supplement of the generated steam according to the running condition of the system so as to ensure that the heat pump drying system continuously and stably runs. In the specific implementation process, the method can be adjusted according to different properties of specific drying materials, and suitable equipment parameters such as the spiral angle of a pushing scraper, the central angle of the scraper, the cloth disc mode and number of a heating disc, the rotating speed of the pushing scraper and the like are determined, so that various factors influencing the drying effect of the materials, such as the retention time of the materials in a dryer, the updating rate of the materials and a heating interface, the area of a steam diffusion interface and the like, can be independently adjusted, the optimal combination is determined, and the drying process is ensured to be carried out under the optimal condition.
The heat pump drying system in the first embodiment of the invention is adopted to carry out a drying experiment on lignite with different water contents with the particle size distribution within the range of 1-6mm, the saturated steam condition is 110-. The specific results are shown in Table-1, comparing the specific energy consumption with the actual production parameters of a certain industry.
TABLE-1 lignite drying Experimental data
Claims (4)
1. A heat pump drying system characterized by: the heat pump drying system comprises a spiral pushing disc type dryer, a driving motor, a frequency converter, a speed reducer, a gas-liquid separator, a gas washing tower, a steam compressor and a superheated steam saturator; the spiral pushing disc type dryer comprises a drying cavity cylinder, a central transmission shaft, a heating disc and a spiral pushing scraper, wherein the heating disc is fixed on the drying cavity cylinder, is provided with a hollow cavity body, is internally provided with reinforcing ribs and simultaneously forms a heating medium circulating flow channel, the spiral pushing scraper is fixed on the central transmission shaft, the heating disc and the spiral pushing scraper are alternately arranged, the rotating surface of the spiral pushing scraper is parallel to the surface of the heating disc, and the rotating surface of the spiral pushing scraper sweeps across the surface of the heating disc;
the wet steam outlet is connected with a steam inlet of a gas washing tower, the steam outlet of the gas washing tower is connected with an inlet of a steam compressor, the outlet of the steam compressor is connected with a steam inlet of an overheat steam saturator, the steam outlet of the overheat steam saturator is connected with an inlet of a heating disc cavity, the outlet of the heating disc cavity is connected with an inlet of a gas-liquid separator, the gas-liquid separator is provided with a noncondensable gas outlet for discharging noncondensable gas and a condensed water outlet for discharging condensed water, the condensed water outlet is divided into two branches for supplying water to the gas washing tower and the overheat steam saturator respectively, the residual condensed water is discharged out of a drying system through a water outlet of the gas washing tower, and a steam generating pipeline is also connected to a pipeline connecting the steam outlet of the overheat steam saturator and the inlet of the heating disc cavity;
the spiral pushing scraper adopts an opposite double-spiral structure, and the spiral angle is 5-30 degrees;
the heating plate is semicircular or three-quarter circular, and the heating plate is arranged on the lower half part of the drying cavity cylinder body or is oppositely and alternately arranged on the upper half part and the lower half part of the drying cavity cylinder body.
2. The heat pump drying system of claim 1, wherein: the heating plates are connected in series or in parallel.
3. A heat pump drying method is characterized in that: the heat pump drying system of claim 1 or 2 is used for drying wet materials, the wet materials continuously enter the drying system from a wet material inlet arranged on the spiral pushing disc type dryer, the wet materials continuously move towards a dry material outlet under the pushing action of the spiral pushing scraper, the wet materials are heated and dried by the heating disc in the moving process, the wet materials are discharged out of the drying system from the dry material outlet after the moisture content meets the drying requirement, the spiral pushing scraper simultaneously plays the roles of conveying and turning, the contact surface of the wet materials and the heating disc is continuously updated and uniformly heated under the turning action of the spiral pushing scraper, simultaneously wet steam is discharged, the raw steam is provided for the heating disc cavity by a raw steam pipeline in the initial drying stage, the generated condensed water and the non-condensed water enter a gas-liquid separator for separation, the non-condensed water is discharged out of the drying system through the non-condensed water outlet, the condensed water is divided into two paths to respectively supply water to a gas washing tower and a superheated steam saturator, and residual condensed water is discharged out of the drying system through a water outlet of the gas washing tower, after the wet material is heated to a specified temperature and generates wet steam, a steam compressor is started, and meanwhile, the supplement of the generated steam is reduced or stopped according to the running condition of the drying system, so that the heat pump drying system continuously and stably runs.
4. The heat pump drying method according to claim 3, characterized in that: the operation condition of the drying system is adjusted by adjusting the helix angle of the spiral pushing scraper, the central angle of the scraper, the disc distribution mode and the number of the heating discs and the rotating speed of the spiral pushing scraper.
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| CN202010667508.2A CN111829324B (en) | 2020-07-13 | 2020-07-13 | Heat pump drying system and method |
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| CN202010667508.2A CN111829324B (en) | 2020-07-13 | 2020-07-13 | Heat pump drying system and method |
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| CN111829324B true CN111829324B (en) | 2021-10-01 |
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| CN113945087B (en) * | 2021-10-15 | 2023-02-28 | 青岛海尔空调电子有限公司 | Method and device for dehumidification, electronic equipment and storage medium |
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| CN102494526A (en) * | 2011-12-15 | 2012-06-13 | 石家庄工大化工设备有限公司 | Method for directly recovering waste gas and waste heat of dryer by utilizing steam jet pump |
| CN102889776A (en) * | 2012-11-07 | 2013-01-23 | 石家庄工大化工设备有限公司 | Cyclic utilization production device of waste gas and steam of dryer |
| WO2018109144A1 (en) * | 2016-12-15 | 2018-06-21 | Hsl Energy Holding Aps | Plant and process for production of a dried product from a humid product |
| CN208254182U (en) * | 2018-05-31 | 2018-12-18 | 青岛捷能高新技术有限责任公司 | A kind of finned hollow blade dryer |
| CN208653075U (en) * | 2018-08-03 | 2019-03-26 | 广州市博立净化设备有限公司 | A kind of freezing adsorption combined drying machine |
| CN111023791A (en) * | 2019-12-23 | 2020-04-17 | 青岛创客智造机械设备有限公司 | Drying waste heat recycling integrated device |
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2020
- 2020-07-13 CN CN202010667508.2A patent/CN111829324B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494526A (en) * | 2011-12-15 | 2012-06-13 | 石家庄工大化工设备有限公司 | Method for directly recovering waste gas and waste heat of dryer by utilizing steam jet pump |
| CN102889776A (en) * | 2012-11-07 | 2013-01-23 | 石家庄工大化工设备有限公司 | Cyclic utilization production device of waste gas and steam of dryer |
| WO2018109144A1 (en) * | 2016-12-15 | 2018-06-21 | Hsl Energy Holding Aps | Plant and process for production of a dried product from a humid product |
| CN208254182U (en) * | 2018-05-31 | 2018-12-18 | 青岛捷能高新技术有限责任公司 | A kind of finned hollow blade dryer |
| CN208653075U (en) * | 2018-08-03 | 2019-03-26 | 广州市博立净化设备有限公司 | A kind of freezing adsorption combined drying machine |
| CN111023791A (en) * | 2019-12-23 | 2020-04-17 | 青岛创客智造机械设备有限公司 | Drying waste heat recycling integrated device |
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