CN114992991A - Based on solar energy-air source bi-position allies oneself with thermal cycle formula sunshine stoving room - Google Patents
Based on solar energy-air source bi-position allies oneself with thermal cycle formula sunshine stoving room Download PDFInfo
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- CN114992991A CN114992991A CN202210539499.8A CN202210539499A CN114992991A CN 114992991 A CN114992991 A CN 114992991A CN 202210539499 A CN202210539499 A CN 202210539499A CN 114992991 A CN114992991 A CN 114992991A
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- 238000001035 drying Methods 0.000 claims abstract description 69
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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
- F26B9/02—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
- F24H4/04—Storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/30—Arrangements for concentrating solar-rays for solar heat collectors with lenses
- F24S23/31—Arrangements for concentrating solar-rays for solar heat collectors with lenses having discontinuous faces, e.g. Fresnel lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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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
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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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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- 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
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a solar drying room based on a solar energy-air source double-position heat circulation type, which comprises a high-efficiency double-position water tank heat hybrid circulation system, a spherical Fresnel solar heat collector, an air source heat pump unit and a dehumidification waste heat return air system, wherein the side surface of a drying room body is made of transparent heat insulation materials, and sunlight is allowed to directly enter the room from the side surface to carry out indoor temperature rise. The drying room is provided with a hemispherical Fresnel heat collecting plate at the top, when sunlight acts on the high-efficiency Fresnel heat collecting plate, the high-efficiency Fresnel heat collecting plate irradiates the high-level heat storage water tank to heat internal circulating water after gathering light rays, absorbed heat is used for drying, and when single solar energy and the stored heat cannot provide indoor required absorbed heat at a preset temperature, the centralized control system in the shed starts an air source heat pump to supply heat. The device is particularly suitable for southwest areas, is used for drying the radix isatidis, is energy-saving and environment-friendly, has high efficiency and high economic, practical and social values, and is very suitable for popularization.
Description
Technical Field
The invention relates to the technical field of drying rooms, in particular to a solar energy-air source based double-position heat circulation type sunlight drying room.
Background
With the development of the world, the demand of human beings on energy is more and more, but the storage of fossil energy is very limited, and people pay attention to the development and utilization of renewable energy. Solar energy is one of new energy resources, and is concerned by people. The drying is an essential step in the south isatis root medicinal material processing process and the product manufacturing flow. Material drying is a very energy intensive process. According to relevant data statistics, the total energy consumption of the material drying process is over 13% of the total energy consumption of the production process, and based on the safe environment-friendly energy-saving concept, the air source heat pump drying and dehumidifying technology is realized. Compared with the traditional gas and fuel gas drying function, the air source heat pump drying technology has strong environmental protection, energy saving and safety effects. At present, the air source heat pump drying technology is applied to various fields of grain drying, tobacco drying, hot pepper drying and the like, and the current mainstream medicinal material drying technology at home and abroad adopts a closed single air source heat pump dryer, most of the drying technology directly utilizes electric energy for drying, and solar energy cannot be more efficiently and directly utilized. Although the heat efficiency is higher compared with that of the common electric heating drying, the green and low-carbon requirements developed at present cannot be realized, and the environmental advantages of the area cannot be utilized according to local conditions to realize energy conservation and emission reduction.
Based on the problems, the problems in the traditional baking method and the drying method of the baking room are solved by researching the air source heat pump and the double-position water tank heat hybrid technology, and the double-position water tank heat hybrid system using the air source and the solar energy is provided. The heat energy of the sun illumination and the heat energy in the air are fully utilized, the problem that a large amount of electric energy needs to be consumed in the traditional drying mode is solved, the power consumption is reduced, and the purposes of high efficiency, greenness and energy conservation are achieved.
Disclosure of Invention
The invention aims to design a novel sunlight room, wherein a spherical Fresnel solar heat collector consists of a spherical Fresnel lens array, an absorber and a heat storage water tank and is positioned at the upper part of a drying chamber. Water in the high-level heat storage water tank flows in the heat exchange pipe through the action of the pump. The waste heat air return system is arranged at the moisture exhaust port, and the heat in the wet air is recycled. The air source heat pump is started under the condition of insufficient light energy, and the running of the sunlight room in a special environment is guaranteed. Through reasonable design of the mechanism and the automatic control system, the device has high economical efficiency, practicability and social value.
The invention is realized by adopting the following technical measures:
a solar energy-air source double-position heat circulation type sunlight drying room comprises a high-efficiency double-position water tank heat hybrid circulation system, a spherical Fresnel solar heat collector system, a dehumidifying waste heat return air system, an air source heat pump unit and an automatic mode switching system;
the high-efficiency double-position water tank thermal hybrid circulation system comprises a high-position heat storage water tank, a heat exchange tube group and a low-position heat storage water tank; the high-level heat storage water tank is arranged above the right drying chamber and the left drying chamber, water receives heat and then brings the heat into the right drying chamber and the left drying chamber through the heat exchange pipe group, and finally the water reaches the low-level heat storage water tank, and the left drying chamber and the right drying chamber are separated by the heat exchange pipe group;
the spherical Fresnel solar heat collecting system comprises a spherical Fresnel lens array and a heat absorber; the Fresnel lens array projects light rays to the heat absorber to realize photo-thermal conversion;
the air source heat pump unit comprises a condenser, a compressor, an evaporator, a compressor pipeline and a throttling pipeline; the compressor compresses refrigerant through a compressor line to a condenser, and the refrigerant returns to the compressor through the condenser, a throttle line, and an evaporator.
The automatic mode switching system comprises a single chip microcomputer and a temperature and humidity sensor, the temperature and humidity sensor is arranged in the drying room, and the single chip microcomputer switches three operation modes according to temperature and humidity information fed back by the temperature and humidity sensor.
Preferably, the dehumidification waste heat air return system comprises a dehumidification fan, an air return fan and a heat exchange core; wherein the side of the drying room is provided with a moisture exhausting fan and a return air fan, and the exhausted over-wet air transfers heat to the introduced fresh air through the heat exchange core.
Preferably, a system internal circulating pump is arranged between the high-level heat storage water tank and the low-level heat storage water tank, and hot water in the high-efficiency double-level water tank heat mixing circulation system flows through the heat exchange pipe set under the forced action of the system internal circulating pump.
Preferably, the heat absorber is arranged at the upper part of the high-level heat storage water tank.
Preferably, the heat exchange tube set is provided with heat exchange fins.
Preferably, the mode automatic switching system can switch three operation modes according to the environment, when the solar radiation can be condensed by the lens to enable the indoor temperature to reach 60 degrees, such as the normal illumination time periods in the noon in winter and in summer, the system only utilizes the sunlight heat to heat up, and the heat pump unit is in a closed state; when the indoor humidity exceeds the preset humidity of the system, the indoor temperature and humidity sensor feeds humidity information back to the single chip microcomputer, a side dehumidifying fan of the drying room is started, a part of over-humid air is taken out, and heat is transferred to the introduced return air through the heat exchange core; the water in the low-level heat storage water tank brings heat into the high-level heat storage water tank through the double-position circulating system and is used for indoor temperature rise; when the temperature in the greenhouse can not reach 60 ℃, the air source heat pump unit is started, and the heat of the air source heat pump unit is merged into the double-position heat hybrid circulation system for heat supply through the high-position heat storage water tank.
Compared with the prior art, the invention has the following beneficial effects:
the system adopts a mode of coupling a new solar technology and a multistage heat pump, and effectively reduces energy loss. Compare and traditional air source heat pump stoving room, practice thrift 34.1 degrees electricity every day. By adopting the mode of combining the air source heat pump and the Fresnel light-gathering plate, the heat island effect is effectively reduced, the emission of pollutants such as sulfur oxides and the like can be reduced, and the atmospheric pollution is relieved. Aiming at the phenomenon of uneven drying quality of the south isatis root, the drying quality of the south isatis root is improved, and the value is improved. Under the condition of drying, the content of the key pharmacological component adenosine in the medicinal materials is increased by 48 percent compared with that in the traditional mode.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. the solar thermal collector comprises a Fresnel lens array, 2 heat absorbers, 3 high-level heat storage water tank, 4 external water supply pump, 5 external water supply pipeline, 6 dehumidifying fan, 7 return air fan, 8 waste heat return air device shell, 9 system internal circulation pump, 10 low-level heat storage water tank, 11 right drying chamber, 12 compressor pipeline, 13 compressor, 14 evaporator, 15 throttle pipeline, 16 condenser, 17 internal circulation pipeline, 18 valve, 19 water tank supporting plate, 20 temperature and humidity sensor, 21 transparent heat insulation shell, 22 left drying chamber, 23 ground, 24 heat exchange fins and 25 heat exchange tube group.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.
In the description of the present invention, unless otherwise specified, the term "connected" is to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Examples
The embodiment of the application provides a solar energy-air source double-position heat circulation type sunlight drying room which comprises a high-efficiency double-position water tank heat hybrid circulation system, a spherical Fresnel solar heat collector system, a dehumidifying waste heat return air system, an air source heat pump unit and an automatic mode switching system;
the high-efficiency double-position water tank thermal hybrid circulation system comprises a high-position heat storage water tank 3, a heat exchange tube group 25 and a low-position heat storage water tank 10; the high-level heat storage water tank 3 is arranged above the right drying chamber 11 and the left drying chamber 22, water receives heat and then brings the heat into the right drying chamber 11 and the left drying chamber 22 through the heat exchange tube group 25 and the heat exchange fins 24, and finally reaches the low-level heat storage water tank 10, and the left drying chamber 22 and the right drying chamber 11 are separated by the heat exchange tube group 25 and the heat exchange fins 24. The spherical Fresnel solar heat collecting system comprises a spherical Fresnel lens array 1 and a heat absorber 2; the Fresnel lens array 1 is embedded in a hemispherical light steel framework, light can be projected to a heat absorber 2 to realize photo-thermal conversion, the heat absorber 2 is arranged at the upper part of a high-level heat storage water tank 3, the high-level heat storage water tank 3 is arranged above a right drying chamber 11 and a left drying chamber 22 through a water tank supporting plate 19, transparent heat insulation shells 21 are arranged outside the right drying chamber 11 and the left drying chamber 22, and the bottoms of the transparent heat insulation shells are fixed on a bottom surface 23;
the air source heat pump unit comprises a condenser 16, a compressor 13, an evaporator 14, a compressor pipeline 12 and a throttling pipeline 15; the compressor 13 compresses refrigerant to the condenser 16 through the compressor pipeline 12, the refrigerant returns to the compressor 13 through the condenser 16, the throttling pipeline 15 and the evaporator 14, wherein the condenser 16 is arranged in the low-level heat storage water tank 10, the upper part of the low-level heat storage water tank 10 is connected with the high-level heat storage water tank 3 through the internal circulation pump 9 of the system, the bottom of the low-level heat storage water tank is connected with the heat exchange pipe group 25 through the internal circulation pipeline 17, the internal circulation pipeline is provided with a valve 18, the high-level heat storage water tank 3 is connected with the external water supply pump 4 through the external water supply pipeline 5, and hot water in the high-efficiency two-position water tank heat hybrid circulation system forcibly flows through the heat exchange pipe group 25 through the internal circulation pump 9 of the system.
The automatic mode switching system comprises a single chip microcomputer and a temperature and humidity sensor 20, the temperature and humidity sensor 20 is arranged in the drying room, and the single chip microcomputer switches three operation modes according to temperature and humidity information fed back by the temperature and humidity sensor 20.
The dehumidifying waste heat air return system comprises a dehumidifying fan 6, an air return fan 7 and a heat exchange core; wherein, the outside of the moisture exhausting fan 6 and the return air fan 7 is provided with a residual heat return air device shell 8, the side surface of the drying room is provided with the moisture exhausting fan 6 and the return air fan 7, and the exhausted over-wet air transmits heat to the introduced fresh air through the heat exchange core.
The automatic mode switching system can switch three operation modes according to the environment, when the solar radiation intensity is strong, such as in the midday winter and the normal illumination time period in summer, the system only utilizes the sunlight heat to heat up, and the heat pump unit is in a closed state; when the indoor humidity exceeds the preset humidity of the system, the indoor temperature and humidity sensor 20 feeds the humidity information back to the single chip microcomputer, the side dehumidifying fan 6 of the drying room is started to bring out a part of over-humid air, and the heat is transferred to the introduced return air through the heat exchange core; the water in the low-level heat storage water tank 10 brings heat into the high-level heat storage water tank 3 through a double-position circulating system and is used for indoor temperature rise; when the temperature in the greenhouse can not reach 60 ℃, the air source heat pump unit is started, and the heat of the air source heat pump unit is merged into the double-position heat series-parallel circulating system for supplying heat through the high-position heat storage water tank 3.
The method comprises the following specific implementation steps: the device switches three operation modes according to the environment. When the solar radiation intensity is stronger, the heat pump unit is closed, and the system only utilizes the sunlight heat to heat up. When the indoor temperature can not reach the set temperature (60 ℃) under the sunlight, the air source heat pump unit is started, and the heat is merged into the double-position heat series-parallel circulating system for supplying heat through the low-position heat storage water tank 10. And the water pump is started to bring the heat into the high-level heat storage water tank 3 through the pipeline with the water in the low-level heat storage water tank 10, so as to heat the indoor water. At the moment, the heat in the drying room is provided by the condensation of a Phillips lens, an air source heat pump and waste heat recovery. When sunlight is lost and the indoor temperature cannot reach the set temperature (60 ℃), only the air source heat pump unit and the water pump are started, and heat is merged into the double-position heat hybrid circulation system for heat supply through the low-position heat storage water tank 10. When the indoor humidity exceeds the preset humidity (45%) of the system in the drying process, the indoor temperature and humidity sensor 20 feeds the humidity information back to the control system, the side dehumidifying fan 6 of the drying room is automatically started, a part of over-humid air is brought out, and heat is transferred to the introduced return air through the heat exchange core.
The particular embodiments described above are illustrative only of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a solar energy-air source double-linkage thermal cycle formula sunshine stoving room which characterized in that: the system comprises a high-efficiency double-position water tank heat hybrid circulating system, a spherical Fresnel solar heat collector system, a dehumidification waste heat return air system, an air source heat pump unit and an automatic mode switching system;
the high-efficiency double-position water tank thermal hybrid circulation system comprises a high-position heat storage water tank (3), a heat exchange pipe set (25) and a low-position heat storage water tank (10); the high-level heat storage water tank (3) is arranged above the right drying chamber (11) and the left drying chamber (22), after receiving heat, water brings the heat into the right drying chamber (11) and the left drying chamber (22) through a heat exchange pipe set (25) and finally reaches the low-level heat storage water tank (10), and the left drying chamber (22) and the right drying chamber (11) are separated by the heat exchange pipe set (25);
the spherical Fresnel solar heat collection system comprises a spherical Fresnel lens array (1) and a heat absorber (2); the Fresnel lens array (1) projects light rays to the heat absorber (2) to realize photo-thermal conversion;
the air source heat pump unit comprises a condenser (16), a compressor (13), an evaporator (14), a compressor pipeline (12) and a throttling pipeline (15); the compressor (13) compresses refrigerant to a condenser (16) via a compressor line (12), and the refrigerant returns to the compressor via the condenser (16), a throttle line (15), and an evaporator (14).
The automatic mode switching system comprises a single chip microcomputer and a temperature and humidity sensor (20), the temperature and humidity sensor (20) is arranged in the drying room, and the single chip microcomputer switches three operation modes according to temperature and humidity information fed back by the temperature and humidity sensor (20).
2. The solar-air source double-linkage heat circulation type sunlight drying room based on the claim 1, wherein the moisture-removing waste heat return air system comprises a moisture-removing fan (6), a return air fan (7) and a heat exchange core; wherein the side of the drying room is provided with a moisture exhausting fan (6) and an air return fan (7), and the exhausted over-wet air transfers heat to the introduced fresh air through the heat exchange core.
3. The solar drying room based on solar-air source two-position heat circulation type is characterized in that an in-system circulating pump (9) is arranged between the high-position heat storage water tank (3) and the low-position heat storage water tank (10), and hot water in the high-efficiency two-position water tank heat hybrid circulation system is forced to flow through the heat exchange tube set (25) through the in-system circulating pump (9).
4. The solar-air source two-position linkage heat circulation type sunlight drying room based on claim 1, wherein the heat absorber (2) is installed at the upper part of the high-level heat storage water tank (3).
5. The solar-air source double-coupled thermal circulation type novel sunlight drying room as claimed in claim 1, wherein the heat exchange tube set (25) is provided with heat exchange fins (24).
6. The novel solar house based on the solar-air source two-position heat circulation type is characterized in that the automatic mode switching system can switch three operation modes according to the environment, when the sun can focus light through the lens to enable the indoor temperature to reach 60 degrees, such as the normal illumination time periods in winter midday and summer, the system only utilizes the sunlight heat to heat, and the heat pump unit is in a closed state; when the indoor humidity exceeds the preset humidity of the system, the indoor temperature and humidity sensor (20) feeds humidity information back to the single chip microcomputer, a side dehumidifying fan (6) of the drying room is started, a part of over-humid air is taken out, and heat is transferred to the introduced return air through the heat exchange core; the water in the low-level heat storage water tank (10) brings heat into the high-level heat storage water tank (3) through a double-position circulating system and is used for indoor temperature rise; when the temperature in the shed can not reach 60 ℃, the air source heat pump unit is started, and the heat of the air source heat pump unit is merged into the double-position heat hybrid circulation system for supplying heat through the high-position heat storage water tank (3).
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| CN202210539499.8A CN114992991A (en) | 2022-05-17 | 2022-05-17 | Based on solar energy-air source bi-position allies oneself with thermal cycle formula sunshine stoving room |
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| CN202210539499.8A CN114992991A (en) | 2022-05-17 | 2022-05-17 | Based on solar energy-air source bi-position allies oneself with thermal cycle formula sunshine stoving room |
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| CN101711599A (en) * | 2009-11-23 | 2010-05-26 | 昆明理工大学 | Bulk curer heat supply and ventilation system supplied by combined solar energy-air source heat pump double heat sources |
| CN110836573A (en) * | 2019-11-05 | 2020-02-25 | 亳州职业技术学院 | Bo-chrysanthemum drying system based on orthogonal optimization and solar energy-heat pump combination |
| CN112229166A (en) * | 2020-11-14 | 2021-01-15 | 玉溪新天力农业装备制造有限公司 | Integrative lower air supply formula drying-machine of air source heat pump switching |
| CN114322469A (en) * | 2021-12-14 | 2022-04-12 | 洛阳双瑞特种装备有限公司 | Multi-heat-source tobacco drying system |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196526A (en) * | 1978-10-26 | 1980-04-08 | CEAF S.p.A. | Drying plant, particularly for timber |
| CN101711599A (en) * | 2009-11-23 | 2010-05-26 | 昆明理工大学 | Bulk curer heat supply and ventilation system supplied by combined solar energy-air source heat pump double heat sources |
| CN110836573A (en) * | 2019-11-05 | 2020-02-25 | 亳州职业技术学院 | Bo-chrysanthemum drying system based on orthogonal optimization and solar energy-heat pump combination |
| CN112229166A (en) * | 2020-11-14 | 2021-01-15 | 玉溪新天力农业装备制造有限公司 | Integrative lower air supply formula drying-machine of air source heat pump switching |
| CN114322469A (en) * | 2021-12-14 | 2022-04-12 | 洛阳双瑞特种装备有限公司 | Multi-heat-source tobacco drying system |
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