CN113876009A - Drying equipment control method and drying system - Google Patents
Drying equipment control method and drying system Download PDFInfo
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- CN113876009A CN113876009A CN202110980457.3A CN202110980457A CN113876009A CN 113876009 A CN113876009 A CN 113876009A CN 202110980457 A CN202110980457 A CN 202110980457A CN 113876009 A CN113876009 A CN 113876009A
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/10—Roasting or cooling tobacco
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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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- 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
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a drying equipment control method and a drying system, when the dry bulb temperature in a curing barn is less than a temperature threshold value and the wet bulb temperature in the curing barn is less than a low humidity threshold value, the temperature of air flow in a main air duct is increased through a first condenser and a second condenser, the temperature in the curing barn is increased, and the heating supply and the temperature increase of the curing barn are realized; when the dry bulb temperature in the curing barn is less than the temperature threshold value and the wet bulb temperature in the curing barn is more than or equal to the low humidity threshold value, the inner dehumidification circulating fan operates, the dehumidification throttling device is opened, the air flow is dehumidified through the evaporation section of the heat pipe heat exchanger and the inner dehumidification evaporator, the air flow is heated through the condensation section of the heat pipe heat exchanger, the first condenser and the second condenser, and the dry bulb temperature and the wet bulb temperature in the curing barn are increased; therefore, the drying equipment control method and the drying system not only realize the temperature and humidity control of the curing barn, but also carry out heat recovery on the air exhausted by the curing barn through the heat pipe heat exchanger, thereby achieving the purposes of saving energy and reducing consumption.
Description
Technical Field
The invention belongs to the technical field of drying, and particularly relates to a drying equipment control method and a drying system.
Background
With the proposal of the carbon peak reaching and carbon neutralization dual-carbon targets, the nation pays more and more attention to the popularization of energy conservation and emission reduction work. Aiming at the agricultural product processing industry, the air energy heat pump instead of a coal-fired curing barn is gradually popularized nationwide at present, and is an important measure for national energy conservation and emission reduction work.
At present, the prior internal air-energy heat pump tobacco drying equipment is usually that on the basis of a prior coal-fired curing barn, a prior coal-fired boiler is dismantled and replaced by an air-energy heat pump unit, namely, the heat pump unit is adopted to absorb the heat energy of the air of the external environment through reverse Carnot circulation to heat and dry the tobacco in the curing barn; the moisture removing part of the curing barn usually uses the original curing barn structure, and high-grade high-temperature and high-humidity heat sources removed by moisture removing in the tobacco drying process are not utilized, so that the overall operation energy consumption of the curing barn is still high, and the energy-saving effect cannot meet the expected requirement.
Disclosure of Invention
The invention provides a control method of drying equipment, which solves the problem of high energy consumption in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a drying apparatus control method, the drying apparatus comprising:
the first heat pump unit comprises a first compressor, a first condenser, a first throttling device and a first evaporator;
the second heat pump unit comprises a second compressor, a second condenser, a second throttling device and a second evaporator;
the main air duct is respectively communicated with the air outlet of the curing barn and the air inlet of the curing barn, and a main circulating fan, the first condenser and the second condenser are arranged in the main air duct;
the heat recovery air duct is respectively communicated with the air outlet of the curing barn and the main air duct; and an inner dehumidification circulating fan, a heat pipe heat exchanger and an inner dehumidification evaporator are arranged in the dehumidification circulating fan; the inner dehumidifying evaporator is connected with the first compressor and the first condenser, and a dehumidifying throttling device is arranged on a connecting pipeline of the inner dehumidifying evaporator and the first condenser;
the control method comprises the following steps:
acquiring the dry bulb temperature in the curing barn, and when the dry bulb temperature in the curing barn is less than a temperature threshold value, executing the following operations:
if the temperature of the wet bulb in the curing barn is less than the low humidity threshold value, controlling the first compressor to start, the second compressor to start, the first throttling device to start, the second throttling device to start, the main circulating fan to run, the internal dehumidifying circulating fan to close and the dehumidifying throttling device to close;
if the temperature of the wet bulb in the curing barn is larger than or equal to the low humidity threshold value, the first compressor is controlled to be started, the second compressor is controlled to be started, the first throttling device is closed, the second throttling device is opened, the main circulating fan operates, the internal dehumidifying circulating fan operates, and the dehumidifying throttling device is opened.
Further, the drying apparatus further includes:
an air inlet of the air exhaust duct is communicated with an air outlet of the curing barn, an air outlet of the air exhaust duct is communicated with the external space, and an air exhaust valve is arranged at the air outlet;
the air inlet of the fresh air duct is communicated with the external space, the air outlet of the fresh air duct is communicated with the heat recovery air duct, and the air outlet of the fresh air duct faces to the condensation section of the heat pipe heat exchanger; a fresh air valve is arranged at an air inlet of the fresh air duct;
the controller controls the opening and closing of the exhaust valve and the fresh air valve;
the control method further comprises the following steps:
when the dry bulb temperature in the curing barn is less than the temperature threshold, the following operations are also performed:
if the temperature of the wet bulb in the curing barn is less than the low humidity threshold value, the exhaust valve and the fresh air valve are controlled to be closed;
if the low humidity threshold value is less than or equal to the wet bulb temperature in the curing barn and less than the high humidity threshold value, the exhaust valve and the fresh air valve are controlled to be closed;
and if the temperature of the wet bulb in the curing barn is more than or equal to the high humidity threshold value, controlling the exhaust valve and the fresh air valve to be opened.
Still further, when the temperature of the dry bulb in the curing barn is more than or equal to the temperature threshold, the following operations are carried out:
controlling the first compressor, the second compressor, the first throttling device, the second throttling device, the dehumidifying throttling device and the inner dehumidifying circulating fan to be closed, and controlling the main circulating fan to operate;
if the temperature of the wet bulb in the curing barn is less than the high humidity threshold value, the moisture exhaust valve and the fresh air valve are controlled to be closed;
and if the temperature of the wet bulb in the curing barn is more than or equal to the high humidity threshold value, controlling the moisture exhaust valve and the fresh air valve to be opened.
In a still further aspect of the present invention,
temperature threshold = Tg0- Δ Tg;
low humidity threshold = Ts0- Δ Ts;
high humidity threshold = Ts0+ Δ Ts;
wherein Tg0 is the target dry bulb temperature; delta Tg is the return difference of the control precision of the target dry ball;
ts0 is the target wet bulb temperature; and delta Ts is the return difference of the target wet bulb control precision.
Furthermore, the inner dehumidifying evaporator is contacted with the leeward side of the evaporation section of the heat pipe heat exchanger, and water receiving discs are arranged at the bottoms of the inner dehumidifying evaporator and the heat pipe heat exchanger.
Furthermore, the inner dehumidifying evaporator and the heat pipe heat exchanger are vertically arranged, and the air outlet of the fresh air duct is higher than the top of the inner dehumidifying evaporator.
Still further, the heat recovery channel comprises a front half section of heat recovery channel and a rear half section of heat recovery channel which are communicated;
the evaporation section and the inner dehumidification evaporator of the heat pipe heat exchanger are positioned in the front half section heat recovery channel; the condensation section of the heat pipe heat exchanger is positioned in the rear half section heat recovery channel;
and the air outlet of the fresh air duct is communicated with the rear half section heat recovery channel.
Furthermore, a wind shield is arranged in the heat recovery air duct;
the wind screen comprises a first horizontal part, a vertical part and a second horizontal part;
the first horizontal part is flush with the bottom of the inner dehumidifying evaporator, one end of the first horizontal part is in contact with the bottom of the inner dehumidifying evaporator, and the other end of the first horizontal part has a set distance from the inner dehumidifying evaporator;
the second horizontal part is flush with the top of the inner dehumidifying evaporator, one end of the second horizontal part is a set distance away from the inner dehumidifying evaporator, and the other end of the second horizontal part is far away from the inner dehumidifying evaporator than one end of the second horizontal part; the second horizontal part is flush with the bottom end of the air outlet of the fresh air duct;
the bottom of the vertical part is connected with the other end of the first horizontal part, the top of the vertical part is connected with one end of the second horizontal part, and the vertical part and the inner dehumidifying evaporator have a set distance.
Still further, the heat pipe heat exchanger includes:
a liquid supply header;
a gas manifold located above the liquid supply header;
the number of the branch pipes is multiple, each branch pipe is vertically arranged, one end of each branch pipe is inserted into the liquid supply collecting pipe, and the other end of each branch pipe is inserted into the gas collecting pipe; a plurality of branch pipes are distributed at equal intervals;
fins are arranged on the outer wall of the upper part of the branch pipe.
A drying system, comprising:
the system comprises a baking room, a temperature and humidity sensor and a control module, wherein the baking room is internally provided with the temperature and humidity sensor and is used for collecting dry bulb temperature and wet bulb temperature in the baking room;
and the controller of the drying equipment executes the control method.
Compared with the prior art, the invention has the advantages and positive effects that: according to the drying equipment control method and the drying system, when the dry bulb temperature in the curing barn is less than the temperature threshold value and the wet bulb temperature in the curing barn is less than the low humidity threshold value, the temperature of the air flow in the main air duct is increased through the first condenser and the second condenser, so that the heat supply and the temperature increase of the curing barn are realized; when the dry bulb temperature in the curing barn is less than the temperature threshold value and the wet bulb temperature in the curing barn is more than or equal to the low humidity threshold value, the inner dehumidification circulating fan operates, the dehumidification throttling device is opened, the air flow is dehumidified through the evaporation section of the heat pipe heat exchanger and the inner dehumidification evaporator, the air flow is heated through the condensation section of the heat pipe heat exchanger, the first condenser and the second condenser, and the dry bulb temperature and the wet bulb temperature in the curing barn are increased; therefore, the drying equipment control method and the drying system not only realize the temperature and humidity control of the curing barn, but also carry out heat recovery on the air exhausted by the curing barn through the heat pipe heat exchanger, thereby achieving the purposes of saving energy and reducing consumption.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a drying system according to the present invention;
fig. 2 is a schematic structural view of an embodiment of the drying apparatus of fig. 1;
FIG. 3 is a schematic diagram of the heat recovery air duct of FIG. 2;
fig. 4 is a schematic diagram of an embodiment of a drying system according to the present invention;
FIG. 5 is a schematic diagram of one embodiment of the heat pipe heat exchanger of FIG. 2;
fig. 6 is a flowchart of an embodiment of a method for controlling a drying apparatus according to the present invention;
fig. 7 is a flowchart of a control method of a drying apparatus according to still another embodiment of the present invention.
Reference numerals:
1. a curing barn; 1-1, an air duct; 1-2, temperature and humidity sensors; 1-3, a bracket; 1-4, tobacco leaves;
2-1, a first compressor; 2-2, a first condenser; 2-3, a first throttling device; 2-4, a first evaporator; 2-5, a first outer fan;
3-1, a second compressor; 3-2, a second condenser; 3-3, a second throttling device; 3-4, a second evaporator; 3-5, a second outer fan;
4. a main air duct; 4-1, a main air return inlet; 4-2, a main air supply outlet; 4-3, a main circulating fan; 4-4, an auxiliary air return inlet;
5. a heat recovery air duct; 5-1, a heat recovery air return inlet; 5-2, a heat recovery air supply outlet; 5-3, an internal dehumidification circulating fan; 5-4, a first half section heat recovery channel; 5-5, a second half-section heat recovery channel;
6. a wind deflector; 6-1, a first horizontal part; 6-2, a second horizontal part; 6-3, a vertical portion;
7. an internal dehumidification evaporator;
8. a dehumidification throttling device;
9. a heat pipe heat exchanger; 9-1, a liquid supply header; 9-2, a gas collecting pipe; 9-3, branch pipes; 9-4, fins;
10. an air exhaust duct; 10-1, an air inlet; 10-2, an air outlet;
11. a fresh air duct; 11-1, an air inlet; 11-2 and an air outlet;
12. a water pan; 13. a separator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Aiming at the problem that the energy consumption of the existing drying equipment is higher, the invention provides a drying equipment control method and a drying system, which are used for controlling the temperature and the humidity of a curing barn, so that the energy consumption is reduced, and the energy is saved. Hereinafter, the control method of the drying apparatus and the drying system according to the present invention will be described in detail with reference to the accompanying drawings.
The drying system of the present embodiment includes a curing barn 1 and a drying device, as shown in fig. 1.
The curing barn 1 is provided with an air inlet, an air outlet and an air duct 1-1, wherein a support 1-3 is arranged in the air duct 1-1, and materials to be dried, such as tobacco leaves 1-4 and the like, are arranged on the support 1-3. The airflow enters the air duct 1-1 through the air inlet to bake the materials, and then flows out of the curing barn 1 through the air outlet. A temperature and humidity sensor 1-2 is arranged in the curing barn 1 and used for collecting the dry bulb temperature and the wet bulb temperature in the curing barn 1 and sending the collected dry bulb temperature and the collected wet bulb temperature to a controller of the drying equipment.
And the controller of the drying equipment controls the operation of the drying equipment according to the received dry-bulb temperature and wet-bulb temperature sent by the temperature and humidity sensor, and gas meeting the temperature and humidity requirements is conveyed to the curing barn 1. The controller of the drying apparatus performs the drying apparatus control method of the present embodiment.
The drying device of the embodiment includes a heat pump unit, a main air duct 4, a heat recovery air duct 5, a heat pipe exchanger 9, an internal dehumidification evaporator 7, a controller, and the like, as shown in fig. 2 to 5.
The first heat pump unit comprises a first compressor 2-1, a first condenser 2-2, a first throttling device 2-3, a first evaporator 2-4 and the like which form a refrigerant circulating pipeline; a first external fan 2-5 is arranged outside the first evaporator 2-4.
And the second heat pump unit comprises a second compressor 3-1, a second condenser 3-2, a second throttling device 3-3, a second evaporator 3-4 and the like which form a refrigerant circulating pipeline, and a second external fan 3-5 is arranged on the outer side of the second evaporator 3-4. The first compressor 2-1, the second compressor 3-1, the first evaporator 2-4, the second evaporator 3-4, the first outer fan 2-5 and the second outer fan 3-5 are all arranged in the external space. Under the drive of the first outer fan 2-5 and the second outer fan 3-5, the air flow in the external space firstly passes through the first evaporator 2-4 and then passes through the second evaporator 3-4. The first condenser 2-2 and the second condenser 3-2 are arranged in the main air duct 4. The first condenser 2-2 is on the windward side of the second condenser 3-2, and the first evaporator 2-4 is on the windward side of the second evaporator 3-4.
The main air duct 4 is respectively communicated with the air outlet of the curing barn 1 and the air inlet of the curing barn 1; the main air duct 4 is provided with a main air return inlet 4-1, an auxiliary air return inlet 4-4 and a main air supply outlet 4-2; the main air return inlet 4-1 is communicated with an air outlet of the curing barn 1, and the main air supply outlet 4-2 is communicated with an air inlet of the curing barn 1; a main circulating fan 4-3, a first condenser 2-2 and a second condenser 3-2 are arranged in the main air duct 4. The main circulating fan 4-3 rotates to drive the air in the main air duct 4 to supply air into the curing barn 1 through the main air supply outlet 4-2. Under the drive of the main circulating fan 4-3, the airflow in the main air duct 4 firstly passes through the first condenser 2-2, then passes through the second condenser 3-2, and then enters the curing barn 1 through the main air supply outlet 4-2.
The heat recovery air duct 5 is respectively communicated with the air outlet of the curing barn and the main air duct 4; an internal dehumidification circulating fan 5-3, a heat pipe exchanger 9 and an internal dehumidification evaporator 7 are arranged in the heat recovery air duct 5. The heat recovery air duct 5 is provided with a heat recovery air return inlet 5-1 and a heat recovery air supply outlet 5-2; the heat recovery air return inlet 5-1 is communicated with an air outlet of the curing barn 1, and the heat recovery air supply outlet 5-2 is communicated with an auxiliary air return inlet 4-4 of the main air duct 4; an internal dehumidifying circulating fan 5-3 is arranged in the heat recovery air duct 5 and close to the heat recovery air supply outlet 5-2.
A heat pipe exchanger 9 located in the heat recovery air duct 5; the heat pipe exchanger 9 comprises an evaporation section (the lower half part of the heat pipe exchanger 9) and a condensation section (the upper half part of the heat pipe exchanger 9), wherein the evaporation section is close to the heat recovery air return inlet 5-1, and the condensation section is close to the heat recovery air supply inlet 5-2.
The inner dehumidifying evaporator 7 is positioned in the heat recovery air duct 5, and the inner dehumidifying evaporator 7 is positioned on the leeward side of the evaporation section of the heat pipe exchanger 9; an air pipe of the inner dehumidifying evaporator 7 is connected with an air return pipe of the first compressor 2-1, a liquid pipe of the inner dehumidifying evaporator 7 is connected with a liquid pipe of the first condenser 2-2, and a dehumidifying throttling device 8 is arranged on a connecting pipeline of the inner dehumidifying evaporator 7 and the first condenser 2-2.
And the controller is used for controlling the operation of the first heat pump unit (the first compressor 2-1, the first throttling device 2-3 and the like), the second heat pump unit (the second compressor 3-1, the second throttling device 3-3 and the like), the dehumidification throttling device 8, the main circulating fan 4-3 and the inner dehumidification circulating fan 5-3 according to the dry bulb temperature and the wet bulb temperature in the curing barn. The first throttling device 2-3, the second throttling device 3-3 and the dehumidifying throttling device 8 are all electronic expansion valves, and the controller controls the operation of the three electronic expansion valves.
The control method of the drying apparatus of the present embodiment mainly includes the following steps, as shown in fig. 6.
Step S1: and acquiring the dry bulb temperature and the wet bulb temperature in the curing barn.
Step S2: and judging whether the temperature of the dry bulb in the curing barn is less than a temperature threshold value.
When the dry bulb temperature in the curing barn is less than the temperature threshold value, the dry bulb temperature of the curing barn 1 is low at the moment, two heat pump units are required to be started to heat the air in the curing barn 1, and meanwhile, the wet bulb temperature in the curing barn is required to be synchronously detected to judge whether dehumidification is required.
Thus, when the dry bulb temperature in the baking room < the temperature threshold:
if the wet bulb temperature in the curing barn is less than the low humidity threshold value, executing the step S3;
if the wet bulb temperature in the curing barn is greater than or equal to the low humidity threshold, step S4 is executed.
Step S3: if the wet bulb temperature in the curing barn is less than the low humidity threshold value, the wet bulb temperature in the curing barn is low, the dehumidifying action is not needed, and only the temperature rise treatment is needed to be carried out on the curing barn 1, so that the first compressor 2-1 is controlled to be started, the second compressor 3-1 is started, the first throttling device 2-3 is started, the second throttling device 3-3 is started, the first outer fan 2-5 is operated, the second outer fan 3-5 is operated, the main circulating fan 4-3 is operated, the inner dehumidifying circulating fan 5-3 is closed, and the dehumidifying throttling device 8 is closed. The air flow in the main air duct 4 is subjected to heating treatment through the first heat pump unit and the second heat pump unit, the dry bulb temperature in the curing barn is increased, and the curing barn 1 is heated.
Step S4: if the wet bulb temperature in the curing barn is larger than or equal to the low humidity threshold value, the wet bulb temperature in the curing barn is higher, the first compressor 2-1 is controlled to be started, the second compressor 3-1 is started, the first throttling device 2-3 is closed, the second throttling device 3-3 is opened, the first outer fan 2-5 is controlled to operate, the second outer fan 3-5 is controlled to operate, the main circulating fan 4-3 is controlled to operate, the inner dehumidifying circulating fan 5-3 is controlled to operate, the dehumidifying throttling device 8 is opened, heat supply and temperature rise of the curing barn 1 are achieved, and heat recovery and dehumidification are achieved through the heat pipe heat exchanger 9 and the inner dehumidifying evaporator 7.
If the first throttling device 2-3 is opened and the dehumidification throttling device 8 is opened, a high-temperature and high-pressure refrigerant discharged by the first compressor 2-1 enters the first condenser 2-2, the refrigerant flowing out of the first condenser 2-2 is divided into two paths, wherein one path of the refrigerant flows to the first evaporator 2-4 through the first throttling device 2-3, and the refrigerant flowing out of the first evaporator 2-4 flows back to the first compressor 2-1; the other path of refrigerant flows to the internal dehumidification evaporator 7 through the dehumidification throttling device 8, and the refrigerant flowing out of the internal dehumidification evaporator 7 flows back to the first compressor 2-1.
When the first throttling device 2-3 is closed and the dehumidification throttling device 8 is opened, the high-temperature and high-pressure refrigerant discharged by the first compressor 2-1 enters the first condenser 2-2, all the refrigerant flowing out of the first condenser 2-2 flows to the internal dehumidification evaporator 7 through the dehumidification throttling device 8, and the refrigerant flowing out of the internal dehumidification evaporator 7 flows back to the first compressor 2-1. In order to ensure the dehumidification effect, when dehumidification is needed, the first throttling device 2-3 is controlled to be closed, and the dehumidification throttling device 8 is controlled to be opened, so that all the refrigerant flowing out of the first condenser 2-2 flows to the dehumidification throttling device 8 and flows into the inner dehumidification evaporator 7 through the dehumidification throttling device 8.
When the main circulating fan 4-3 and the internal dehumidifying circulating fan 5-3 are operated, a part of air flow flowing out of the air outlet of the curing barn 1 enters the main air duct 4 through the main air return opening 4-1, and the other part of air flow enters the heat recovery air duct 5 through the heat recovery air return opening 5-1. The air flow entering the heat recovery air duct 5 exchanges heat with the evaporation section of the heat pipe exchanger 9, the evaporation section of the heat pipe exchanger 9 precools the air flow, the cooled and precooled air flow flows through the inner dehumidifying evaporator 7, the temperature of the air flow is reduced to be below the dew point temperature after being cooled by the inner dehumidifying evaporator 7, and the air flow is condensed into water drops on the surface of the inner dehumidifying evaporator 7; the low-temperature air flow passing through the internal dehumidification evaporator 7 flows through the condensation section of the heat pipe heat exchanger 9 along the heat recovery air duct 5 under the action of the internal dehumidification circulating fan 5-3, cools the gaseous refrigerant in the condensation section of the heat pipe heat exchanger 9, meanwhile, the low-temperature air flow flows through the condensation section of the heat pipe heat exchanger 9 to realize temperature rise and preheating, then flows to the auxiliary return air inlet 4-4 through the heat recovery air supply outlet 5-2, is converged into the main air duct 4, is mixed with the air flow entering the main air duct 4 through the main return air inlet 4-1, the mixed air flow sequentially flows through the first condenser 2-2 and the second condenser 3-2 to exchange heat with the refrigerant in the first condenser 2-2 and the second condenser 3-2, the temperature of the air flow is increased, and then the air flow enters the baking room 1 through the main air supply outlet 4-2, and one air flow circulation is realized.
The first condenser 2-2 and the second condenser 3-2 are arranged in the main air duct 4, the heat pipe heat exchanger 9 and the inner dehumidifying evaporator 7 are arranged in the heat recovery air duct 5, the air flow is pre-cooled through the evaporation section of the heat pipe heat exchanger 9, the air flow is dehumidified through the inner dehumidifying evaporator 7, the air flow is preheated through the condensation section of the heat pipe heat exchanger 9, then the air flow is heated through the first condenser 2-2 and the second condenser 3-2, the dehumidified and heated air is sent into the baking room, the dehumidification and the efficient heat recovery of the air discharged by the baking room 1 are realized, the purpose of further energy saving is achieved, energy is saved, and consumption is reduced. By designing two sets of heat pump units, the heating capacity of the drying equipment can be ensured, the air flow temperature in the main air duct 4 is quickly increased, and the problem that the cost is too high due to too many heat pump units is solved.
According to the control method of the drying equipment, when the dry bulb temperature in the curing barn is less than the temperature threshold value and the wet bulb temperature in the curing barn is less than the low humidity threshold value, the temperature of the air flow in the main air duct 4 is increased through the first condenser 2-2 and the second condenser 3-2, so that the temperature in the curing barn is increased, and the heat supply and the temperature increase of the curing barn 1 are realized; when the dry bulb temperature in the curing barn is less than the temperature threshold value and the wet bulb temperature in the curing barn is more than or equal to the low humidity threshold value, the inner dehumidifying circulating fan 5-3 operates, the dehumidifying throttling device 8 is opened, the air flow is dehumidified through the evaporation section of the heat pipe heat exchanger 9 and the inner dehumidifying evaporator 7, the air flow is heated through the condensation section of the heat pipe heat exchanger 9, the first condenser 2-2 and the second condenser 3-2, and the dry bulb temperature and the wet bulb temperature in the curing barn are increased; therefore, the control method of the drying equipment in the embodiment not only realizes the temperature and humidity control of the curing barn, but also recovers the heat of the air exhausted from the curing barn 1 through the heat pipe exchanger 9, thereby achieving the purposes of energy conservation and consumption reduction.
The control method of the drying equipment of the embodiment solves the problem that the energy consumption is higher due to the fact that a high-grade heat source exhausted by a dehumidification process is not utilized in the existing drying process.
In this embodiment, the drying device further includes an exhaust air duct 10 and a fresh air duct 11.
An air inlet 10-1 of the air exhaust duct 10 is communicated with an air outlet of the curing barn 1, an air outlet 10-2 of the air exhaust duct is communicated with the external space, and an air exhaust valve is arranged at the air outlet 10-2. The controller controls the opening and closing of the exhaust valve. When the exhaust valve is opened, the airflow in the curing barn 1 enters the exhaust air duct 10 through the air inlet 10-1 and then is exhausted to the external space through the exhaust outlet 10-2. Therefore, the exhaust valve is opened, and the high-humidity air in the curing barn 1 can be exhausted.
The air inlet 11-1 of the fresh air duct 11 is communicated with the external space, the air outlet 11-2 of the fresh air duct 11 is communicated with the heat recovery air duct 5, and the air outlet 11-2 of the fresh air duct 11 faces to the condensation section of the heat pipe heat exchanger 9; a fresh air valve is arranged at the air inlet 11-1 of the fresh air duct 11. The controller controls the opening and closing of the fresh air valve. When the fresh air valve is opened, air in the external space enters the fresh air duct 11 through the air inlet 11-1, then enters the heat recovery air duct 5 through the air outlet 11-2, is blown to the condensation section of the heat pipe heat exchanger 9, and is heated and preheated after passing through the condensation section of the heat pipe heat exchanger 9; then flows to an auxiliary return air inlet 4-4 through a heat recovery air supply outlet 5-2 and is converged into the main air duct 4. Therefore, the fresh air valve is opened, and the introduction of the dry air in the external environment can be realized.
Through the design of the air exhaust duct 10 and the fresh air duct 11, the temperature of wet balls in the curing barn can be quickly reduced, the quick dehumidification function is realized, and the energy consumption is low.
Therefore, as a preferable aspect of the present embodiment, when the dry bulb temperature in the curing barn < the temperature threshold, the drying apparatus control method of the present embodiment further includes the steps of:
if the temperature of the wet bulb in the curing barn is less than the low humidity threshold value, the exhaust valve and the fresh air valve are controlled to be closed;
if the low humidity threshold value is less than or equal to the wet bulb temperature in the curing barn and less than the high humidity threshold value, the exhaust valve and the fresh air valve are controlled to be closed;
and if the temperature of the wet bulb in the curing barn is more than or equal to the high humidity threshold value, controlling the exhaust valve and the fresh air valve to be opened.
Referring to fig. 7, when the dry bulb temperature in the hothouse is less than the temperature threshold, the following operations are performed:
if the wet bulb temperature in the curing barn is less than the low humidity threshold value, executing the step S3;
if the low humidity threshold value is less than or equal to the wet bulb temperature in the curing barn and less than the high humidity threshold value, executing the step S41;
if the wet bulb temperature in the curing barn is not less than the high humidity threshold, the step S42 is executed.
Step S3: if the temperature of the wet bulb in the curing barn is less than the low humidity threshold value, the temperature of the wet bulb in the curing barn is low, the dehumidifying action is not needed, and only the temperature rise treatment is needed to be carried out on the curing barn 1, so that the first compressor 2-1 is controlled to be started, the second compressor 3-1 is started, the first throttling device 2-3 is started, the second throttling device 3-3 is started, the first outer fan 2-5 is operated, the second outer fan 3-5 is operated, the main circulating fan 4-3 is operated, the inner dehumidifying circulating fan 5-3 is closed, and the dehumidifying throttling device 8 is closed; and controlling the exhaust valve and the fresh air valve to be closed. The air flow in the main air duct 4 is subjected to heating treatment through the first heat pump unit and the second heat pump unit, the dry bulb temperature in the curing barn is increased, and the curing barn 1 is heated.
Step S41: if the low humidity threshold value is less than or equal to the wet bulb temperature in the baking room and less than the high humidity threshold value, the wet bulb temperature in the baking room is higher, the first compressor 2-1 is controlled to be started, the second compressor 3-1 is started, the first throttling device 2-3 is closed, the second throttling device 3-3 is opened, the first outer fan 2-5 is controlled to operate, the second outer fan 3-5 is controlled to operate, the main circulating fan 4-3 is controlled to operate, the inner dehumidifying circulating fan 5-3 is controlled to operate, the dehumidifying throttling device 8 is opened, the exhaust valve and the fresh air valve are closed, heat supply and temperature rise of the baking room 1 are achieved, and heat recovery and dehumidification are achieved through the heat pipe heat exchanger 9 and the inner dehumidifying evaporator 7.
Step S42: if the wet bulb temperature in the curing barn is larger than or equal to the high humidity threshold value, the wet bulb temperature in the curing barn is very high, the first compressor 2-1 is controlled to be started, the second compressor 3-1 is started, the first throttling device 2-3 is closed, the second throttling device 3-3 is opened, the first outer fan 2-5 is controlled to operate, the second outer fan 3-5 is controlled to operate, the main circulating fan 4-3 is controlled to operate, the inner dehumidifying circulating fan 5-3 is controlled to operate, the dehumidifying throttling device 8 is opened, the exhaust valve and the fresh air valve are opened, heat supply and temperature rise of the curing barn 1 are achieved, heat recovery and dehumidification are achieved through the heat pipe heat exchanger 9 and the inner dehumidifying evaporator 7, and dehumidification is achieved through the exhaust air duct and the fresh air duct.
Therefore, when the temperature of the wet bulb in the curing barn is very high, the exhaust valve and the fresh air valve are opened, the high-humidity air in the curing barn is exhausted by utilizing the exhaust air duct 10, the outside fresh air is introduced by utilizing the fresh air duct 11, the humidity in the curing barn can be quickly reduced, the quick dehumidification function is realized, and the energy consumption is low.
In this embodiment, in order to further satisfy the temperature and humidity requirements of the baking room and save energy, when the temperature of the dry bulb in the baking room is greater than or equal to the temperature threshold, step S5 is executed, as shown in fig. 7.
Step S5: when the temperature of dry balls in the curing barn 1 is larger than or equal to the temperature threshold value, the temperature of the dry balls in the curing barn at the moment is proved to meet the requirement, and the first heat pump unit and the second heat pump unit stop heating operation to avoid energy waste, so that the first compressor 2-1, the second compressor 3-1, the first outer fan 2-5, the second outer fan 3-5, the first throttling device 2-3, the second throttling device 3-3, the dehumidification throttling device 8 and the inner dehumidification circulating fan 5-3 are controlled to be closed, the main circulating fan 4-3 operates to ensure normal circulation of hot air in the curing barn, and the curing process is carried out on the tobacco leaves 1-4 in the curing barn; simultaneously, still need be according to the wet bulb temperature in the roast room, judge whether open hydrofuge valve and new trend valve: if the temperature of the wet bulb in the curing barn is less than the high humidity threshold value, the moisture exhaust valve and the fresh air valve are controlled to be closed, and moisture exhaust is not needed; and if the temperature of the wet bulb in the curing barn is more than or equal to the high humidity threshold value, the moisture exhaust valve and the fresh air valve are controlled to be opened for moisture exhaust.
Therefore, when the temperature of the dry bulb in the curing barn 1 is more than or equal to the temperature threshold value, the temperature of the wet bulb in the curing barn is regulated and controlled through the opening and closing of the moisture exhaust valve and the fresh air valve, and the method is simple and convenient and consumes less energy.
In this embodiment, the temperature threshold = Tg0- Δ Tg;
low humidity threshold = Ts0- Δ Ts; high humidity threshold = Ts0+ Δ Ts;
wherein Tg0 is the target dry bulb temperature; delta Tg is the return difference of the control precision of the target dry ball;
ts0 is the target wet bulb temperature; and delta Ts is the return difference of the target wet bulb control precision.
In the material drying process, each drying section has corresponding target dry-bulb temperature and target wet-bulb temperature. By selecting the temperature threshold, the low humidity threshold and the high humidity threshold, the drying equipment can be controlled to operate conveniently, so that the dry bulb temperature and the wet bulb temperature in the curing barn meet the requirements, and the energy waste is avoided.
After a tobacco drying process is started, the drying equipment is started to operate, the temperature and humidity sensor 1-2 in the curing barn 1 detects the dry bulb temperature Tg and the wet bulb temperature Ts in the curing barn 1 in real time, the detected dry bulb temperature Tg and the detected wet bulb temperature Ts are sent to the controller, and the controller controls the operation of the drying equipment according to the received dry bulb temperature Tg and the received wet bulb temperature Ts.
When the dry bulb temperature Tg in the curing barn 1 is less than Tg 0-delta Tg, the dry bulb temperature of the curing barn 1 is low, a heat pump unit needs to be started to heat the air in the curing barn 1, and meanwhile, the air humidity in the curing barn needs to be synchronously detected to judge whether to perform dehumidification treatment. The method comprises the following specific steps:
(1) if the wet bulb temperature Ts in the curing barn is less than Ts 0-delta Ts, the temperature of the wet bulb in the curing barn is low, the moisture removing action is not needed, only the temperature rise treatment is needed to be carried out on the curing barn 1, and the drying equipment runs in an external heat absorption mode: at the moment, the controller controls the first compressor 2-1 and the second compressor 3-1 to be started, the opening degrees of the first throttling device 2-3 and the second throttling device 3-3 are dynamically adjusted according to the exhaust target temperatures of the first compressor 2-1 and the second compressor 3-1, the first outer fan 2-5, the second outer fan 3-5 and the main circulating fan 4-3 run at a high speed, the dehumidification throttling device 8 is in a closed state, and the inner dehumidification circulating fan 5-3 is in a stop state; closing the moisture exhaust valve and the fresh air valve; at the moment, the two heat pump units absorb the heat of the external environment temperature through the first evaporator 2-4 and the second evaporator 3-4, and heat supply and temperature rise are carried out on the air flow in the main air duct 4 through the first condenser 2-2 and the second condenser 3-2, so that the baking room 1 is heated.
(2) If Ts 0-delta Ts is less than or equal to wet bulb temperature Ts in the curing barn which is less than Ts0+ delta Ts, the drying equipment operates in an external heat absorption and internal dehumidification heat supply mode: the controller controls the first compressor 2-1 and the second compressor 3-1 to be started, the first throttling device 2-3 is in a closed state, the dehumidifying throttling device 8 and the second throttling device 3-3 are opened, the opening degrees of the dehumidifying throttling device 8 and the second throttling device 3-3 are dynamically adjusted according to the exhaust target temperatures of the first compressor 2-1 and the second compressor 3-1, the first outer fan 2-5, the second outer fan 3-5 and the main circulating fan 4-3 run at a high speed, and the inner dehumidifying circulating fan 5-3 runs at a high speed; closing the moisture exhaust valve and the fresh air valve; at the moment, the heat of the external environment temperature is absorbed by the second evaporator 3-4, the heat is recovered by dehumidification of the heat pipe exchanger 9 and the inner dehumidification evaporator 7, and the temperature of the air flow in the main air duct 4 is increased by the first condenser 2-2 and the second condenser 3-2, so that the heating and dehumidification of the curing barn are realized.
(3) If the wet bulb temperature Ts in the curing barn 1 is more than or equal to Ts0+ delta Ts, the wet bulb temperature in the curing barn is higher, and the tobacco leaf needs to be subjected to quick dehumidification, otherwise, the tobacco leaf curing quality is easily affected, namely, the drying equipment operates in a quick dehumidification mode:
the controller controls the first compressor 2-1 and the second compressor 3-1 to be started, the first throttling device 2-3 is in a closed state, the dehumidifying throttling device 8 and the second throttling device 3-3 are opened, the opening degrees of the dehumidifying throttling device 8 and the second throttling device 3-3 are dynamically adjusted according to the exhaust target temperatures of the first compressor 2-1 and the second compressor 3-1, the first outer fan 2-5, the second outer fan 3-5 and the main circulating fan 4-3 run at a high speed, and the inner dehumidifying circulating fan 5-3 runs at a high speed.
And the controller controls the dehumidification valve and the fresh air valve to be opened together, dry air in the external environment is introduced through the fresh air valve, and the high-humidity air in the curing barn is exhausted through the dehumidification valve.
Therefore, the "rapid dehumidification mode" is: and the moisture exhaust valve and the fresh air valve are opened on the basis of the mode of 'external heat absorption and internal dehumidification heat supply', so that the strong moisture exhaust control is carried out, and the temperature requirement of a wet bulb in the curing barn is quickly met.
When the dry bulb temperature Tg in the curing barn 1 is larger than or equal to Tg 0-delta Tg, the dry bulb temperature in the curing barn reaches the target requirement, the first heat pump unit and the second heat pump unit stop heating operation, and the first compressor 2-1, the second compressor 3-1, the first outer fan 2-5, the second outer fan 3-5, the first throttling device 2-3, the second throttling device 3-3, the dehumidification throttling device 8 and the inner dehumidification circulating fan 5-3 are all closed; the main circulating fan 4-3 runs at high wind to ensure the normal circulation of hot air in the curing barn and carry out the curing process on the tobacco leaves 1-4 in the curing barn. Simultaneously, still need be according to the wet bulb temperature in the roast room, judge whether open hydrofuge valve and new trend valve:
(1) if the wet bulb temperature Ts in the curing barn 1 is less than Ts0+ delta Ts, the moisture exhaust valve and the fresh air valve are closed.
(2) If the wet bulb temperature Ts in the curing barn 1 is more than or equal to Ts0+ delta Ts, the moisture exhaust valve and the fresh air valve are opened.
In the embodiment, the internal dehumidifying evaporator 7 is in contact with the leeward surface of the evaporation section of the heat pipe exchanger 9, so that the space occupation can be reduced; and a water pan 12 is arranged at the bottom of the internal dehumidification evaporator 7 and the heat pipe exchanger 9 and is used for receiving the condensed water flowing down from the internal dehumidification evaporator 7, and the condensed water flowing into the water pan 12 is discharged out of the unit through a drain pipe.
In this embodiment, the internal dehumidifying evaporator 7 and the heat pipe heat exchanger 9 are both vertically arranged, and the outlet air of the air outlet 11-2 of the fresh air duct 11 is horizontally blown to the condensation section of the heat pipe heat exchanger 9; the position of the air outlet 11-2 of the fresh air duct 11 is higher than the top of the inner dehumidifying evaporator 7, so that fresh air in the fresh air duct 11 is prevented from blowing to the inner dehumidifying evaporator 7, the temperature of the fresh air is prevented from being reduced, and meanwhile, the flow of normal air flow in the heat recovery air duct 5 is prevented from being disturbed by the fresh air.
As a preferable design of this embodiment, the heat recovery channel 5 includes a front half section heat recovery channel 5-4 and a rear half section heat recovery channel 5-5 which are communicated; the inlet of the front half section heat recovery channel 5-4 is a heat recovery air return inlet 5-1, the outlet of the front half section heat recovery channel 5-4 is communicated with the inlet of the rear half section heat recovery channel 5-5, and the outlet of the rear half section heat recovery channel 5-5 is a heat recovery air supply outlet 5-2; the evaporation section of the heat pipe heat exchanger 9 and the internal dehumidification evaporator 7 are positioned in the front half section of the heat recovery channel 5-4; the condensation section of the heat pipe exchanger 9 is positioned in the rear half section of the heat recovery channel 5-5; an air outlet 11-2 of the fresh air duct 11 is communicated with the rear half section heat recovery channel 5-5, and the air outlet 11-2 faces the condensation section of the heat pipe heat exchanger 9.
The heat recovery channel 5 is designed into a front half section of heat recovery channel 5-4 and a rear half section of heat recovery channel 5-5, so that the design and the implementation are convenient, the fresh air in the fresh air duct 11 is prevented from blowing to the inner dehumidification evaporator 7, the temperature of the fresh air is prevented from being reduced, and the normal airflow in the heat recovery air duct is prevented from being disturbed by the fresh air.
As a preferable design of this embodiment, a wind deflector 6 is disposed in the heat recovery air duct 5, and the wind deflector 6 includes a first horizontal portion 6-1, a vertical portion 6-3, and a second horizontal portion 6-2. The first horizontal part 6-1, the second horizontal part 6-2 are horizontally arranged, and the vertical part 6-3 is vertically arranged.
The first horizontal portion 6-1 is flush with the bottom of the inner dehumidifying evaporator 7, one end of the first horizontal portion 6-1 contacts the bottom of the inner dehumidifying evaporator 7, and the other end of the first horizontal portion 6-1 has a set distance from the inner dehumidifying evaporator 7.
The second horizontal part 6-2 is flush with the top of the inner dehumidifying evaporator 7, one end of the second horizontal part 6-2 has a set distance with the inner dehumidifying evaporator 7, and the other end of the second horizontal part 6-2 is farther away from the inner dehumidifying evaporator 7 than one end of the second horizontal part 6-2; the second horizontal portion 6-2 is flush with the bottom end of the air outlet 11-2 of the fresh air duct 11, or the position of the second horizontal portion 6-2 is lower than the bottom end of the air outlet 11-2 of the fresh air duct 11.
The bottom of the vertical part 6-3 is connected to the other end of the first horizontal part 6-1, the top of the vertical part 6-3 is connected to one end of the second horizontal part 6-2, and the vertical part 6-3 has a set distance from the inner dehumidifying evaporator 7. The set distance > 0, the set distance between the vertical portion 6-3 and the inner dehumidifying evaporator 7, leaving room for the air flow passing through the inner dehumidifying evaporator 7. The distance is set to a value determined by the size of the space in the heat recovery duct 5, for example, 10 cm.
By designing the wind shield 6, the fresh air blown out from the air outlet 11-2 of the fresh air duct 11 is horizontally and directly blown to the condensation section of the heat pipe exchanger 9, so that the fresh air is prevented from blowing to the inner dehumidification evaporator 7, the temperature of the fresh air is prevented from being reduced, and the flow of normal air flow in the fresh air disturbance heat recovery air duct 5 is also avoided. Moreover, the wind shield is simple in structure, convenient to implement and low in cost.
The windward side of the evaporation section of heat pipe exchanger 9 is provided with baffle 13, and baffle 13 level is laid, and baffle 13 and the top parallel and level of the evaporation section of heat pipe exchanger 9, the one end of baffle 13 and the evaporation section contact of heat pipe exchanger 9, baffle 13 are used for preventing from blowing out from roast room 1 to the condensation section of heat pipe exchanger 9.
As a preferred design scheme of this embodiment, the heat pipe heat exchanger 9 is a copper pipe fin type heat pipe heat exchanger. Specifically, the heat pipe exchanger 9 comprises a liquid supply header 9-1, a gas collecting pipe 9-2 and a branch pipe 9-3, and is shown in fig. 5. The lower half parts of the liquid supply collecting pipe 9-1 and the branch pipe 9-3 are evaporation sections of the heat pipe heat exchanger 9, and the upper half part of the branch pipe 9-3 and the gas collecting pipe 9-2 are condensation sections of the heat pipe heat exchanger 9.
A liquid supply collecting pipe 9-1 which is provided with a plurality of liquid outlet holes for inserting the branch pipes 9-3.
The air collecting pipe 9-2 is positioned above the liquid supply collecting pipe 9-1; which is provided with a plurality of air inlets for inserting the branch pipes 9-3.
The branch pipes 9-3 are arranged in a plurality, each branch pipe 9-3 is vertically arranged, one end of each branch pipe 9-3 is inserted into the liquid supply collecting pipe 9-1, and the other end of each branch pipe 9-3 is inserted into the gas collecting pipe 9-2; the plurality of branch pipes 9-3 are arranged at equal intervals, so that the heat exchange of the heat pipe heat exchanger 9 is uniform. The branch pipe 9-3 is made of a copper pipe.
Fins 9-4 are arranged on the outer wall of the upper part of the branch pipe 9-3 and are used for increasing the heat exchange area with the surrounding air and improving the heat exchange efficiency.
The heat pipe heat exchanger 9 is vertically arranged, a refrigerant is filled in the heat pipe heat exchanger, the refrigerant in the liquid supply header pipe 9-1 is in a liquid state, the liquid refrigerant absorbs heat and evaporates into a gas state, and the gas gradually rises along the branch pipe 9-3 until the gas enters the gas collecting pipe 9-2; after the gaseous refrigerant is cooled by low-temperature air outlet of the internal dehumidification evaporator 7, the gaseous refrigerant is condensed into liquid state, flows down along the inner pipe wall of the branch pipe 9-3, and finally flows to the liquid supply header pipe 9-1, so that refrigerant circulation is realized. Therefore, the refrigerant in the liquid supply header 9-1 and the refrigerant in the lower half part of the branch pipe 9-3 are liquid, and the refrigerant in the upper half part of the branch pipe 9-3 and the refrigerant in the gas collecting pipe 9-2 are gaseous.
Through designing foretell heat pipe exchanger 9, not only the heat transfer is even, and heat exchange efficiency is high, simple structure moreover, and is with low costs, the realization of being convenient for.
As another preferred design scheme of this embodiment, the heat pipe heat exchanger 9 is a microchannel heat pipe heat exchanger, and has high heat exchange efficiency, stable performance, and high cost performance.
The control method and the drying system of the drying equipment can be used for fully recovering and applying high-temperature and high-humidity high-grade heat sources in a dehumidification process in the drying process, further improve the operation efficiency of the drying equipment, improve the energy efficiency of the drying equipment and achieve the purposes of energy conservation and emission reduction.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A drying equipment control method is characterized in that: the drying apparatus includes:
the first heat pump unit comprises a first compressor, a first condenser, a first throttling device and a first evaporator;
the second heat pump unit comprises a second compressor, a second condenser, a second throttling device and a second evaporator;
the main air duct is respectively communicated with the air outlet of the curing barn and the air inlet of the curing barn, and a main circulating fan, the first condenser and the second condenser are arranged in the main air duct;
the heat recovery air duct is respectively communicated with the air outlet of the curing barn and the main air duct; and an inner dehumidification circulating fan, a heat pipe heat exchanger and an inner dehumidification evaporator are arranged in the dehumidification circulating fan; the inner dehumidifying evaporator is connected with the first compressor and the first condenser, and a dehumidifying throttling device is arranged on a connecting pipeline of the inner dehumidifying evaporator and the first condenser;
the control method comprises the following steps:
acquiring the dry bulb temperature in the curing barn, and when the dry bulb temperature in the curing barn is less than a temperature threshold value, executing the following operations:
if the temperature of the wet bulb in the curing barn is less than the low humidity threshold value, controlling the first compressor to start, the second compressor to start, the first throttling device to start, the second throttling device to start, the main circulating fan to run, the internal dehumidifying circulating fan to close and the dehumidifying throttling device to close;
if the temperature of the wet bulb in the curing barn is larger than or equal to the low humidity threshold value, the first compressor is controlled to be started, the second compressor is controlled to be started, the first throttling device is closed, the second throttling device is opened, the main circulating fan operates, the internal dehumidifying circulating fan operates, and the dehumidifying throttling device is opened.
2. The drying apparatus control method according to claim 1, characterized in that: the drying apparatus further includes:
an air inlet of the air exhaust duct is communicated with an air outlet of the curing barn, an air outlet of the air exhaust duct is communicated with the external space, and an air exhaust valve is arranged at the air outlet;
the air inlet of the fresh air duct is communicated with the external space, the air outlet of the fresh air duct is communicated with the heat recovery air duct, and the air outlet of the fresh air duct faces to the condensation section of the heat pipe heat exchanger; a fresh air valve is arranged at an air inlet of the fresh air duct;
the controller controls the opening and closing of the exhaust valve and the fresh air valve;
the control method further comprises the following steps:
when the dry bulb temperature in the curing barn is less than the temperature threshold, the following operations are also performed:
if the temperature of the wet bulb in the curing barn is less than the low humidity threshold value, the exhaust valve and the fresh air valve are controlled to be closed;
if the low humidity threshold value is less than or equal to the wet bulb temperature in the curing barn and less than the high humidity threshold value, the exhaust valve and the fresh air valve are controlled to be closed;
and if the temperature of the wet bulb in the curing barn is more than or equal to the high humidity threshold value, controlling the exhaust valve and the fresh air valve to be opened.
3. The drying apparatus control method according to claim 2, characterized in that: when the temperature of the dry bulb in the curing barn is more than or equal to the temperature threshold, the following operations are executed:
controlling the first compressor, the second compressor, the first throttling device, the second throttling device, the dehumidifying throttling device and the inner dehumidifying circulating fan to be closed, and controlling the main circulating fan to operate;
if the temperature of the wet bulb in the curing barn is less than the high humidity threshold value, the moisture exhaust valve and the fresh air valve are controlled to be closed;
and if the temperature of the wet bulb in the curing barn is more than or equal to the high humidity threshold value, controlling the moisture exhaust valve and the fresh air valve to be opened.
4. The drying apparatus control method according to claim 1, characterized in that:
temperature threshold = Tg0- Δ Tg;
low humidity threshold = Ts0- Δ Ts;
high humidity threshold = Ts0+ Δ Ts;
wherein Tg0 is the target dry bulb temperature; delta Tg is the return difference of the control precision of the target dry ball;
ts0 is the target wet bulb temperature; and delta Ts is the return difference of the target wet bulb control precision.
5. The drying apparatus control method according to claim 1, characterized in that: the inner dehumidifying evaporator is in contact with the leeward side of the evaporation section of the heat pipe heat exchanger, and water receiving discs are arranged at the bottoms of the inner dehumidifying evaporator and the heat pipe heat exchanger.
6. The drying apparatus control method according to claim 2, characterized in that: the inner dehumidifying evaporator and the heat pipe heat exchanger are vertically arranged, and the air outlet of the fresh air duct is higher than the top of the inner dehumidifying evaporator.
7. The drying apparatus control method according to claim 2, characterized in that: the heat recovery channel comprises a front half section of heat recovery channel and a rear half section of heat recovery channel which are communicated;
the evaporation section and the inner dehumidification evaporator of the heat pipe heat exchanger are positioned in the front half section heat recovery channel; the condensation section of the heat pipe heat exchanger is positioned in the rear half section heat recovery channel;
and the air outlet of the fresh air duct is communicated with the rear half section heat recovery channel.
8. The drying apparatus control method according to claim 2, characterized in that: a wind shield is arranged in the heat recovery air duct;
the wind screen comprises a first horizontal part, a vertical part and a second horizontal part;
the first horizontal part is flush with the bottom of the inner dehumidifying evaporator, one end of the first horizontal part is in contact with the bottom of the inner dehumidifying evaporator, and the other end of the first horizontal part has a set distance from the inner dehumidifying evaporator;
the second horizontal part is flush with the top of the inner dehumidifying evaporator, one end of the second horizontal part is a set distance away from the inner dehumidifying evaporator, and the other end of the second horizontal part is far away from the inner dehumidifying evaporator than one end of the second horizontal part; the second horizontal part is flush with the bottom end of the air outlet of the fresh air duct;
the bottom of the vertical part is connected with the other end of the first horizontal part, the top of the vertical part is connected with one end of the second horizontal part, and the vertical part and the inner dehumidifying evaporator have a set distance.
9. The drying apparatus control method according to any one of claims 1 to 8, characterized in that: the heat pipe heat exchanger includes:
a liquid supply header;
a gas manifold located above the liquid supply header;
the number of the branch pipes is multiple, each branch pipe is vertically arranged, one end of each branch pipe is inserted into the liquid supply collecting pipe, and the other end of each branch pipe is inserted into the gas collecting pipe; a plurality of branch pipes are distributed at equal intervals;
fins are arranged on the outer wall of the upper part of the branch pipe.
10. The utility model provides a drying system which characterized in that: the method comprises the following steps:
the system comprises a baking room, a temperature and humidity sensor and a control module, wherein the baking room is internally provided with the temperature and humidity sensor and is used for collecting dry bulb temperature and wet bulb temperature in the baking room;
a drying apparatus, a controller of which performs the control method of any one of claims 1 to 9.
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| PCT/CN2022/094911 WO2023024616A1 (en) | 2021-08-25 | 2022-05-25 | Drying device control method and drying system |
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| CN202110980457.3A CN113876009B (en) | 2021-08-25 | 2021-08-25 | Drying equipment control method and drying system |
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|---|---|---|---|---|
| CN115307419A (en) * | 2022-07-18 | 2022-11-08 | 青岛海尔空调电子有限公司 | Integrated drying system and control method for integrated drying system |
| WO2023024616A1 (en) * | 2021-08-25 | 2023-03-02 | 青岛海尔空调电子有限公司 | Drying device control method and drying system |
| CN115804464A (en) * | 2022-12-15 | 2023-03-17 | 鹤山市雪尔达冷冻设备有限公司 | Tobacco baking method and device based on internal circulation heat pump drying device |
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| CN113876009B (en) | 2023-05-26 |
| WO2023024616A1 (en) | 2023-03-02 |
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