CN110345666B - Control method, system and device for heat pump drying unit and storage medium - Google Patents
Control method, system and device for heat pump drying unit and storage medium Download PDFInfo
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- CN110345666B CN110345666B CN201910555624.2A CN201910555624A CN110345666B CN 110345666 B CN110345666 B CN 110345666B CN 201910555624 A CN201910555624 A CN 201910555624A CN 110345666 B CN110345666 B CN 110345666B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a control method, a system, a device and a storage medium for a heat pump drying unit, wherein the method comprises the following steps: the detected baking room ambient temperature and ambient humidity data are compared with the preset target temperature and target humidity, and the heat pump drying unit is automatically set to be the most appropriate working mode in the current baking room drying operation environment, so that the drying operation is more energy-saving and efficient, the drying effect of the materials is guaranteed, and the production efficiency is improved. The system comprises a man-machine interaction module, a sensor detection module, a data processing module and a central control module. The apparatus includes a memory for storing a program and a processor for loading the program to perform the control method. By using the control scheme of the invention, the automatic and efficient operation of the heat pump drying unit can be realized, and the heat pump drying unit can be widely applied to the field of drying and dehumidifying.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a control method, a control system, a control device and a storage medium for a heat pump drying unit.
Background
The drying technology generally refers to a technology of adding heat to wet materials and discharging volatile moisture to obtain solid products with certain moisture content, and the technology is widely applied to almost all production industries of agriculture, food, chemical industry, medicine, mineral products, textile and the like. Drying is a key technical link for improving the product quality in the production process of products, and is also a high-energy-consumption process, and about 12 percent of industrial energy consumption is used for drying operation in developed countries. Therefore, the development and application of the drying energy-saving technology have great significance at present when the energy is deficient, and the heat pump drying technology has the remarkable advantages of energy conservation, high product quality, good drying condition and the like and is the mainstream technology applied in the drying field in the market at present.
In the prior art, the following two common heat pump drying technologies are mainly used: one is an open-circuit heat pump drying technology, which uses an open air source heat pump drying unit to heat the air in the external environment as dry hot air for heating and dehumidifying, and then discharges the humid hot air carrying a large amount of water vapor out of the system; the other is a closed-circuit heat pump drying technology, the object to be dried is hermetically placed in a heat-insulating and windproof system, and the wet hot air and the heat pump working medium exchange heat through closed hot air circulation to remove certain moisture, so that the purposes of dehumidification and drying are achieved. Both of these techniques have great limitations at present, and cannot be well applied to various working conditions. In the former method, moisture in the curing barn is evaporated by heating air, and then moisture is discharged out of the curing barn through the air duct, so that the drying purpose is achieved, but if the dried material cannot be cured at a high temperature, the machine set of this type cannot be normally used; in the latter method, the temperature rise process is very slow and takes a long time only by means of the condensation heat, and in the later drying period, because the moisture in the circulating air is greatly reduced, the available latent heat of water is difficult to maintain the heating of the condenser to the circulating air, so that the temperature in the unit is reduced, and the drying effect is greatly reduced.
Disclosure of Invention
To solve the above technical problem, an embodiment of the present invention aims to: the control method, the system, the device and the storage medium for the heat pump drying unit are provided, and the working mode of the heat pump drying unit can be flexibly adjusted to adapt to different working environments.
The technical scheme adopted by the embodiment of the invention is as follows:
in a first aspect, an embodiment of the present invention provides a control method for a heat pump drying unit, including the following steps:
detecting the ambient temperature and the ambient humidity in the curing barn;
respectively comparing the detected ambient temperature and ambient humidity with a preset target temperature and target humidity;
and adjusting the working mode of the heat pump drying unit according to the comparison result.
Further, the operation mode of the heat pump drying unit specifically includes:
the heat pump drying unit is used for drying in a hot air drying mode;
the heat pump drying unit is used for drying in a condensing and dehumidifying mode;
and a standby mode in which the heat pump drying unit is stopped from operating.
Further, the step of adjusting the operation mode of the heat pump drying unit according to the comparison result specifically includes:
when the ambient temperature is lower than the target temperature and the ambient humidity is lower than the target humidity, setting the heat pump drying unit to be in an open working mode;
when the ambient temperature is higher than the target temperature and the ambient humidity is higher than the target humidity, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature is higher than the target temperature and the ambient humidity is lower than the target humidity, setting the heat pump drying unit to be in a standby mode.
Further, the step of adjusting the operation mode of the heat pump drying unit according to the comparison result specifically includes:
and when the ambient temperature is lower than the target temperature and the ambient humidity is higher than the target humidity, adjusting the working mode of the heat pump drying unit according to the change conditions of the ambient temperature and the ambient humidity.
Further, the step of adjusting the operation mode of the heat pump drying unit according to the change of the ambient temperature and the ambient humidity specifically includes:
when at least one of the ambient temperature and the ambient humidity is unchanged or is increased, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature and the ambient humidity are both reduced, setting the heat pump drying unit to be in an open working mode.
Further, the set range of the target temperature is 20-70 ℃;
the set range of the target humidity is 5% relative humidity to 90% relative humidity.
Further, the heat pump drying unit is a semi-open type air source heat pump unit or a unit consisting of an open type air source heat pump and a closed type air source heat pump.
In a second aspect, an embodiment of the present invention provides a control system for a heat pump drying unit, including:
the human-computer interaction module is used for receiving target temperature and target humidity data input by a user and sending the target temperature and target humidity data to the data processing module;
the sensor detection module is used for acquiring the ambient temperature and ambient humidity data in the curing barn in real time and sending the ambient temperature and ambient humidity data to the data processing module;
the data processing module is used for analyzing the data received from the human-computer interaction module and the sensor detection module, and sending related control information to the central control module after processing;
and the central control module is used for controlling the heat pump drying unit to switch the operation modes.
In a third aspect, an embodiment of the present invention provides a control device for a heat pump drying unit, including:
the heat pump drying unit comprises a memory and a processor, wherein the memory is used for storing at least one program, and the processor is used for loading the at least one program to execute a control method of any heat pump drying unit.
In a fourth aspect, embodiments of the present invention provide a storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform a method of controlling any of the heat pump dryer groups.
One or more of the above-described embodiments of the present invention have the following advantages: the drying effect of the materials to be achieved is determined by setting two indexes of target temperature and target humidity, and the drying requirements of various different materials can be adapted. And automatically setting the heat pump drying unit to be the most appropriate working mode under the current drying operation environment of the curing barn by comparing the detected ambient temperature and ambient humidity data of the curing barn with the preset target temperature and target humidity. The embodiment of the invention combines the operation mechanisms of the two existing drying technologies, so that the heat pump drying unit can be always kept in an optimal operation mode in the drying operation process, the energy is saved, the efficiency is high, the material drying effect is ensured, and the production efficiency is improved.
Drawings
Fig. 1 is a flow chart of a control method for a heat pump drying unit according to the invention;
FIG. 2 is a schematic diagram of a heat pump drying unit according to the present invention;
FIG. 3 is a schematic view of the wind direction of an open operating mode of a heat pump dryer according to an embodiment of the present invention;
fig. 4 is a schematic wind direction diagram of a closed operating mode of a heat pump drying unit according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method for a heat pump drying unit according to an embodiment of the invention;
FIG. 6 is a block diagram of a control system for a heat pump drying unit according to the present invention;
fig. 7 is a block diagram showing the structure of the control device for the heat pump drying unit according to the present invention.
Reference numerals: 1. a curing barn; 2. material preparation; 3. a temperature sensor; 4. a humidity sensor; 5. an evaporator; 6. a condenser; 7. a fan; 8. a condensation drainage device; 9. a fan guide unit; 10. an exhaust fan set; 11. an air inlet; 12. and (7) air outlet.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a control method for a heat pump drying unit, including the following steps:
detecting the ambient temperature and the ambient humidity in the curing barn;
respectively comparing the detected ambient temperature and ambient humidity with a preset target temperature and target humidity;
and adjusting the working mode of the heat pump drying unit according to the comparison result.
Referring to fig. 2, the system working principle of the heat pump drying unit of the present invention is as follows: the heat pump unit can absorb heat from a low-temperature heat source to convert low-grade heat energy into high-grade heat energy. The heat pump drying system mainly comprises two subsystems: a cold medium circuit and a drying medium circuit. The refrigerant medium loop comprises a compressor, an evaporator, an expansion valve and a condenser, wherein the refrigerant medium can be a novel R410A or R32, and the refrigerant medium loop is environment-friendly, non-toxic, energy-saving and efficient; the drying medium loop mainly comprises a fan, a ventilation channel and a curing barn in the heat pump drying unit, wherein the drying medium refers to hot air, and the drying medium loop is used for circularly drying hot air to dry materials. The fan and the ventilation channel are mainly used for ensuring the normal flow direction of the drying hot air; the roasting room is used for placing materials, the specific size can be selected according to needs, the internal structure can be set into a multilayer type or a suspension type for placing materials of different types, and the partition plate can be made of high-temperature-resistant and corrosion-resistant stainless steel materials.
After the materials are placed in the curing barn, a control system of the heat pump drying unit is opened, the target temperature and the target humidity of the drying operation are set at the main control end, and the heat pump drying unit is started to dry. In the drying process, the control system can detect the drying operation condition in the curing barn in real time through the temperature sensor and the humidity sensor and analyze and compare the data, so that the performance of which working mode the heat pump drying unit is in under the current working environment is more excellent, or whether the drying operation achieves the set target or not is analyzed. And setting the heat pump drying unit into a working mode adaptive to the current working environment according to the analysis result, and returning to the step of re-detecting the working environment in the curing barn. And circularly executing the operations of detecting, analyzing, setting the working mode and the like until the detected data of the ambient temperature and the ambient humidity in the curing barn indicate that the drying operation reaches the target preset by the user, stopping operating the heat pump drying unit and reminding the user that the drying operation is finished.
Further as a preferred embodiment, the operation mode of the heat pump drying unit specifically includes:
the heat pump drying unit is used for drying in a hot air drying mode;
the heat pump drying unit is used for drying in a condensing and dehumidifying mode;
and a standby mode in which the heat pump drying unit is stopped from operating.
Referring to fig. 3, a schematic diagram of a wind direction of an open operating mode of a heat pump drying unit according to an embodiment of the present invention, and the following describes a principle of the heat pump drying unit according to the present invention in the open operating mode with reference to fig. 3. When the heat pump drying unit is set to be in an open working mode, the control system controls and starts a draught fan unit 9 and an exhaust fan unit 10 of the heat pump drying unit, and opens an air inlet 11 and an air outlet 12. The cold medium circulation process comprises the following steps: the refrigerant medium absorbs partial waste heat in the damp and hot waste gas discharged after drying the materials 2 in the curing barn 1 in the evaporator 5, the waste heat is evaporated to be in a steam state, the compressor applies work to compress the waste heat to be in a high-temperature and high-pressure state, then the waste heat enters the condenser 6 to be condensed to release heat, and the heat released refrigerant medium flows through the expansion valve to be in a low-temperature and low-pressure state again and enters the evaporator 5 to absorb heat energy. The drying medium (air) circulation process is as follows: the draught fan set 9 absorbs natural air outside the curing barn 1 from the air inlet 11, and the natural air is heated by the condenser 6 in the heat pump drying unit and then is used as dry hot air to be sent into the curing barn 1 by the fan 7 to dry the material 2; the damp and hot waste gas from the curing barn 1 absorbing the moisture of the material 2 is discharged from the air outlet 12 through the exhaust unit 10 after absorbing part of the waste heat through the evaporator 5 in the heat pump unit. In this mode, the temperature of the hot drying air in the curing barn 1 is rapidly increased, the temperature can be stably maintained at a high standard for a long time, and the drying speed is high.
Referring to fig. 4, a schematic wind direction diagram of a closed operating mode of a heat pump drying unit according to an embodiment of the present invention, and the following describes a principle of the heat pump drying unit according to the present invention in the closed operating mode with reference to fig. 4. When the heat pump drying unit is set to be in a closed working mode, the control system controls to close the induced draft fan set 9 and the exhaust fan set 10 of the heat pump drying unit and close the air inlet 11 and the air outlet 12. The cold medium circulation process is basically the same as that in the open operation mode, and is not described again. The drying medium (air) circulation process is as follows: the dry hot air is sent into the baking room 1 by the fan 7 to dry the material 2, the damp and hot air absorbing the moisture of the material 2 flows through the evaporator 5 in the heat pump unit to reduce the temperature of the damp and hot air to below the dew point temperature, and the moisture is separated out from the damp and hot air (the condensed water is discharged out of the baking room by the condensation drainage device 8) to obtain the dry air with lower humidity, and the evaporator 5 can absorb part of the waste heat and the condensation heat in the damp and hot air in the process. After the dry air flows through a condenser 6 in the heat pump unit for heating, high-temperature and low-humidity dry hot air is generated, and the dry hot air is introduced into the curing barn 1 through a fan 7 to continuously dry the material 2. In this mode, because the heat pump drying unit is in a closed running environment, the hot and humid air does not need to be discharged, so that the heat can be fully recycled in the system, and the drying efficiency is high.
The standby mode means that the drying effect reaches a preset ideal index through detection, at the moment, the heat pump drying unit stops running, information of the completion of the drying operation is transmitted to the control system, and the control system reminds a user in a corresponding mode. Specifically, the related information may be transmitted to the user through a flash lamp or a buzzer, etc., so as to inform the user that the drying operation is completed, and the material 2 may be recovered or the drying operation of the next stage may be performed.
Further as a preferred embodiment, the step of adjusting the operation mode of the heat pump drying unit according to the comparison result specifically includes:
when the ambient temperature is lower than the target temperature and the ambient humidity is lower than the target humidity, setting the heat pump drying unit to be in an open working mode;
when the ambient temperature is higher than the target temperature and the ambient humidity is higher than the target humidity, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature is higher than the target temperature and the ambient humidity is lower than the target humidity, setting the heat pump drying unit to be in a standby mode.
The embodiment of the invention provides a control method for comprehensively judging the current operation condition of a curing barn 1 according to the data of the environmental temperature and the environmental humidity in the curing barn 1 detected by a temperature sensor 3 and a humidity sensor 4 so as to determine the working mode of a heat pump drying unit. The implementation principle is as follows: it can be known from the general knowledge related to the drying technology that, in the range that the material property of the material 2 can bear, when the other conditions are the same, the higher the temperature of the hot drying air introduced into the curing barn 1 is, the more the moisture that can be volatilized by the material 2 is, that is, the higher the proportion of the water vapor component in the hot air in the curing barn 1 is, and thus, the higher the humidity detected by the humidity sensor 4 is.
Generally, in the initial stage of drying the material 2, the ambient temperature in the curing barn 1 is low, and the ambient humidity is also low, so that the detected result is that the ambient temperature is lower than the target temperature, and the ambient humidity is lower than the target humidity, which indicates that the temperature in the curing barn 1 is not raised yet, and the drying process of the material 2 is slow, so that the heat pump drying unit is set to be in an open working mode at this time, and the temperature can be raised relatively quickly by drying, so that the initial drying efficiency is improved.
When the environmental temperature in the curing barn 1 in the system is greatly increased and the moisture in the material 2 is volatilized more, the situation that the environmental temperature is higher than the target temperature and the environmental humidity is higher than the target humidity occurs, and the drying efficiency of the heat pump drying unit is very high at the moment. However, it should be noted that since the ambient temperature exceeds the target temperature, the heat pump drying unit may be damaged or the effective components may be lost due to the excessive temperature when the heat pump drying unit is operated at the temperature for a long time, so that the drying effect cannot be guaranteed. The open operating mode has a further disadvantage: during the process of discharging the hot and humid exhaust gas with high temperature, the evaporator 5 in the heat pump drying unit cannot fully recover the heat contained therein, so that much energy is wasted. Based on the above problems, the heat pump drying unit is set to be in the closed operation mode at the moment, so that the drying environment in the curing barn 1 can be better adapted, on one hand, the closed operation mode circularly heats and condenses the drying hot air to dehumidify, and the temperature in the heat pump drying unit is lower and more gently changes compared with the open operation mode; on the other hand, in the closed operation mode, the drying medium (air) performs closed circulation, only condensed water is discharged from the condensation and drainage device 8 in the dehumidification process, and hot air resources in the heat pump drying unit are not discharged, so that the heat pump drying unit has good performance of saving energy consumption.
The embodiment of the invention also provides a control method for judging whether the drying of the material 2 achieves the ideal effect according to the ambient temperature and the ambient humidity in the curing barn 1, which comprises the following specific steps: as described above, when the other conditions are the same, the higher the temperature of the hot drying air introduced into the curing barn 1 is, the more the moisture can be volatilized from the material 2, and the higher the humidity is. And in the process of drying the material 2, the moisture content is gradually discharged, and the moisture content is continuously reduced. Under the condition that the temperature of the drying hot air introduced into the curing barn 1 is the same, the longer the drying operation time is, the less the content of the water vapor capable of volatilizing from the material 2 is, and the detected environmental humidity of the curing barn 1 is lower and lower. Therefore, according to this phenomenon, the target temperature is set to a higher temperature value as a reference, and the target humidity is used as an index for judging the drying effect of the material 2. When the ambient temperature in the curing barn 1 reaches the target temperature, if the detected ambient humidity is larger than the target humidity, the material 2 is not dried fully; on the contrary, if the detected ambient humidity is lower than the target humidity, it indicates that the moisture in the material 2 has been sufficiently volatilized, and the moisture content of the material 2 has reached the drying effect desired by us. Therefore, when the ambient temperature is higher than the target temperature and the ambient humidity is lower than the target humidity, the drying task is considered to be completed satisfactorily, and the drying unit is set to the standby mode to wait for the next operation of the user.
Further as a preferred embodiment, the step of adjusting the operation mode of the heat pump drying unit according to the comparison result specifically further includes:
and when the ambient temperature is lower than the target temperature and the ambient humidity is higher than the target humidity, adjusting the working mode of the heat pump drying unit according to the change conditions of the ambient temperature and the ambient humidity.
Further as a preferred embodiment, the step of adjusting the operation mode of the heat pump drying unit according to the change of the ambient temperature and the ambient humidity specifically includes:
when at least one of the ambient temperature and the ambient humidity is unchanged or is increased, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature and the ambient humidity are both reduced, setting the heat pump drying unit to be in an open working mode.
The embodiment of the invention provides a control method for solving the problem of low working efficiency in the later drying stage in a closed working mode. As mentioned in the background, the following problems exist in the closed drying mode: in the later drying period, because the moisture in the circulating air is greatly reduced, the available latent heat of water is difficult to maintain the heating of the condenser 6 to the circulating air, so that the temperature in the heat pump drying unit is reduced, and the drying effect is greatly reduced. Therefore, when the heat pump drying unit is in the closed operation mode, the condition needs to be effectively detected and a solution is provided for the condition. The principle of the method provided by the embodiment of the invention is as follows: in the closed operation mode, when the ambient temperature is lower than the target temperature and the ambient humidity is higher than the target humidity, continuous closed dehumidification is very efficient and energy-saving, for the condition that the temperature in the heat pump drying unit is reduced due to the reduction of the moisture content, the ambient humidity and the ambient temperature result detected this time can be compared with the ambient humidity and the ambient temperature result detected last time, if the ambient humidity detected this time is not reduced compared with the ambient humidity detected last time, it can be expected that the water vapor in the hot air in the heat pump drying unit can provide enough latent heat of water for the condenser 6 to heat the circulating air at this time, so the temperature cannot be reduced, the drying operation can reach the previous drying effect, and the closed operation mode can be continuously maintained at this time; if the detected ambient humidity is lower than the previous detected ambient humidity and the ambient temperature is not lower, it indicates that the water vapor in the hot air in the heat pump drying unit can still provide enough latent heat of water for the condenser 6 to heat the circulating air at the moment, and the drying operation can still achieve the previous drying effect, so that the closed operating mode can be continuously maintained at the moment; if this environmental humidity, the environmental temperature who detects compare the environmental humidity, the environmental temperature who detects last time and all taken place to reduce, then can confirm that the steam in the hot-blast in the heat pump set can not provide sufficient latent heat of water and be used for heating the circulated air for condenser 6 this moment, and dry effect has descended, continues to carry out closed operation mode and will be unfavorable for the normal clear of 2 dry operation of material. Therefore, the drying mode can be set to the open drying mode at this time, and the drying room 1 is rapidly heated up through drying and drying, thereby improving the drying efficiency.
Further as a preferred embodiment, the set range of the target temperature is 20 to 70 degrees celsius;
the set range of the target humidity is 5% relative humidity to 90% relative humidity.
In the embodiment of the invention, the set value of the target temperature is determined according to the range which can be borne by the dried material 2, and is preferably lower than the maximum temperature value which can be borne by the dried material, so that the condition that the final quality of a product is influenced by the damage of the dried hot air to the material 2 in the drying operation process can be ensured. Of course, within the allowable range, the higher the target temperature setting, the deeper the degree of drying and the faster the drying speed. The set value of the target humidity has the following two characteristics: firstly, the higher the target humidity is set, the longer the time of the heat pump drying unit in the open working mode is, so that the drying time is shortened, and the production efficiency of products is improved; second, the higher the target humidity setting is, the earlier the situation that the ambient temperature is higher than the target temperature and the ambient humidity is lower than the target humidity may result in the premature ending of the whole drying process and the quality of the product may slip. Therefore, combining the above two results, it can be seen that the target humidity setting is twofold, and that either too high or too low may adversely affect the production and operation of the product. In actual production, a balance point can be found between production efficiency and product quality, the actual requirements of the production efficiency and the product quality are considered, the target humidity is flexibly set, and accordingly the maximized benefit is obtained. In the actual application of the existing heat pump drying unit, the range of the target temperature is generally set to be 20 ℃ to 70 ℃, and the range of the target humidity is set to be 5% to 90% of the relative humidity.
Further, as a preferred embodiment, the heat pump drying unit is a semi-open type air source heat pump unit or a unit composed of an open type air source heat pump and a closed type air source heat pump.
The control method of the heat pump drying unit provided by the invention has the advantages that in order to achieve the purposes of universality and energy conservation, the specific working environment is judged, and an open operation mode is adopted within the temperature range allowed by the material 2, so that the heating time is saved, and the efficiency is improved; when the temperature critical point of the drying of the material 2 is reached, a closed operation mode is adopted, the continuous dehumidification is realized, the energy consumption is saved, and the material 2 is not damaged due to overhigh temperature. The heat pump drying unit is mainly applied to a heat pump drying unit capable of flexibly switching an open type working mode and a closed type working mode. Specifically, the heat pump drying unit can be a semi-open type heat pump drying unit integrating an open type working mode and a closed type working mode, and the control system can switch the modes by controlling the related hot air channel, the fan 7, the condensation drainage device 8 and the like; or the heat pump drying unit can be composed of an open type air source heat pump and a closed type air source heat pump, and the control system is responsible for coordinating and switching the working heat pump to adjust the working mode of the heat pump drying unit.
The invention is further described with reference to the drawings and the specific examples.
Referring to fig. 5, a flowchart of a control method for a heat pump drying unit according to an embodiment of the present invention includes the following specific steps:
operation S101: the user starts up, the heat pump drying unit enters a ready-to-run state, waits for the user to input target instruction information, and executes operation S102;
operation S102: the user inputs the target temperature and the target humidity of the drying program, the heat pump drying unit starts to operate after the completion of the confirmation, and the operation S103 is executed;
operation S103: acquiring environmental temperature and environmental humidity data detected by a temperature sensor and a humidity sensor in the curing barn, and executing operation S104;
operation S104: comparing whether the ambient temperature is less than the target temperature, if so, executing operation S105, otherwise, executing operation S111;
operation S105: comparing whether the environmental humidity is less than the target humidity, if so, executing operation S106, otherwise, executing operation S108;
operation S106: setting the operation mode of the heat pump drying unit to an open type operation mode, and executing operation S107;
operation S107: controlling the heat pump dryer set to operate in the mode and returning to operation S103;
operation S108: comparing the environment humidity detected this time with the environment humidity detected last time, if the environment humidity detected this time is less than the environment humidity detected last time, executing operation S109, and if the environment humidity detected this time is greater than or equal to the environment humidity detected last time, executing operation S110;
operation S109: comparing the detected environment temperature with the environment temperature detected last time, if the detected environment temperature is less than the environment temperature detected last time, executing operation S106, and if the detected environment temperature is greater than or equal to the environment temperature detected last time, executing operation S110;
operation S110: setting the operation mode of the heat pump drying unit to be a closed type operation mode, and executing operation S107;
operation S111: comparing whether the humidity in the baking room is greater than the target humidity, if so, executing operation S110, otherwise, executing operation S112;
operation S112: and closing the heat pump drying unit, ending the drying program and waiting for the next task input by the user.
The following drying procedure was used with wolfberry as the drying material: setting the target temperature to be 55 ℃ and the target humidity to be 35% of relative humidity, and starting the heat pump drying unit to operate.
In the initial stage, the heat pump drying unit carries out drying treatment in an open working mode, and temperature is rapidly increased for dehumidification; when humidity rises to be greater than 35% of relative humidity in the baking house, the unit will shift into closed operation mode and carry out drying and dehumidifying treatment, and this process includes two stages: a high-humidity low-temperature, medium-humidity medium-temperature stage, wherein the whole closed dehumidification process of the stage lasts about 10 hours; when the humidity and the temperature in the curing barn are reduced, the unit is switched to the open operation mode again for deep drying, the finally detected temperature and humidity data meet the standard of a standby program after lasting for about 2-3 hours, and the drying and dehumidifying operation is completed, so that the medlar meets the set drying operation requirement.
In this procedure, the target humidity and the target temperature may be adjusted according to the relevant data or the actual production experience. The drying product using the control method is uniform and thorough, the drying quality is stable, the whole drying process is environment-friendly, energy-saving and efficient, the heat pump drying unit can run for 24 hours, the temperature and the humidity are accurately controlled, and the control method is very intelligent.
Referring to fig. 6, an embodiment of the present invention further provides a control system for a heat pump drying unit, including:
the human-computer interaction module is used for receiving target temperature and target humidity data input by a user and sending the target temperature and target humidity data to the data processing module;
the sensor detection module is used for acquiring the ambient temperature and ambient humidity data in the curing barn in real time and sending the ambient temperature and ambient humidity data to the data processing module;
the data processing module is used for analyzing the data received from the human-computer interaction module and the sensor detection module, and sending related control information to the central control module after processing;
and the central control module is used for controlling the heat pump drying unit to switch the operation modes.
The human-computer interaction module can be arranged on a touch screen of the heat pump drying unit, so that a user can clearly and conveniently set target temperature and target humidity data of drying operation, or check information such as ambient temperature, ambient humidity and drying time in the curing barn in real time; the central control module is used for coordinating the whole work of the heat pump drying unit, and specifically comprises the running state of the unit, the running state of each fan, the opening and closing of an air inlet and an air outlet, the drainage treatment of a condensation drainage device and the like.
Referring to fig. 7, an embodiment of the present invention further provides a control apparatus for a heat pump drying unit, including:
the heat pump drying unit comprises a memory and a processor, wherein the memory is used for storing at least one program, and the processor is used for loading the at least one program to execute a control method of any heat pump drying unit.
It can be seen that the contents in the foregoing method embodiments are all applicable to this apparatus embodiment, the functions specifically implemented by this apparatus embodiment are the same as those in the foregoing method embodiment, and the advantageous effects achieved by this apparatus embodiment are also the same as those achieved by the foregoing method embodiment.
In addition, the embodiment of the invention also provides a storage medium, wherein processor-executable instructions are stored in the storage medium, and the processor-executable instructions are used for executing the control method of any heat pump drying unit when being executed by a processor.
It can be seen that the contents in the foregoing method embodiments are all applicable to this storage medium embodiment, the functions specifically implemented by this storage medium embodiment are the same as those in the foregoing method embodiments, and the advantageous effects achieved by this storage medium embodiment are also the same as those achieved by the foregoing method embodiments.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A control method for a heat pump drying unit is characterized by comprising the following steps:
detecting the ambient temperature and the ambient humidity in the curing barn;
respectively comparing the detected ambient temperature and ambient humidity with a preset target temperature and target humidity;
adjusting the working mode of the heat pump drying unit according to the comparison result;
the working mode of the heat pump drying unit specifically comprises the following steps:
the heat pump drying unit is used for drying in a hot air drying mode;
the heat pump drying unit is used for drying in a condensing and dehumidifying mode;
a standby mode in which the heat pump dryer group is stopped from operating;
the step of adjusting the working mode of the heat pump drying unit according to the comparison result specifically includes:
when at least one of the ambient temperature and the ambient humidity is unchanged or is increased, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature and the ambient humidity are both reduced, setting the heat pump drying unit to be in an open working mode.
2. The control method for the heat pump drying unit according to claim 1, wherein:
the step of adjusting the working mode of the heat pump drying unit according to the comparison result specifically includes:
when the ambient temperature is lower than the target temperature and the ambient humidity is lower than the target humidity, setting the heat pump drying unit to be in an open working mode;
when the ambient temperature is higher than the target temperature and the ambient humidity is higher than the target humidity, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature is higher than the target temperature and the ambient humidity is lower than the target humidity, setting the heat pump drying unit to be in a standby mode.
3. The control method for the heat pump drying unit according to claim 1, wherein:
the set range of the target temperature is 20-70 ℃;
the set range of the target humidity is 5% relative humidity to 90% relative humidity.
4. A control method for a heat pump drying unit according to any one of claims 1 to 3, characterized in that:
the heat pump drying unit is a semi-open type air source heat pump unit or a unit consisting of an open type air source heat pump and a closed type air source heat pump.
5. A control system for a heat pump dryer assembly, comprising:
the human-computer interaction module is used for receiving target temperature and target humidity data input by a user and sending the target temperature and target humidity data to the data processing module;
the sensor detection module is used for acquiring the ambient temperature and ambient humidity data in the curing barn in real time and sending the ambient temperature and ambient humidity data to the data processing module;
the data processing module is used for analyzing the data received from the human-computer interaction module and the sensor detection module, and sending related control information to the central control module after processing;
the central control module is used for controlling the heat pump drying unit to switch the working modes;
the working mode of the heat pump drying unit specifically comprises the following steps:
the heat pump drying unit is used for drying in a hot air drying mode;
the heat pump drying unit is used for drying in a condensing and dehumidifying mode;
a standby mode in which the heat pump dryer group is stopped from operating;
the central control module is specifically configured to:
when at least one of the ambient temperature and the ambient humidity is unchanged or is increased, setting the heat pump drying unit to be in a closed working mode;
and when the ambient temperature and the ambient humidity are both reduced, setting the heat pump drying unit to be in an open working mode.
6. A control apparatus for a heat pump drying aggregate, comprising:
a memory for storing at least one program and a processor for loading the at least one program to perform the method of any one of claims 1-4.
7. A storage medium having stored therein instructions executable by a processor, the storage medium comprising:
the processor-executable instructions, when executed by a processor, are for performing the method of any one of claims 1-4.
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| CN110779322B (en) * | 2019-10-30 | 2020-09-22 | 珠海格力电器股份有限公司 | Control method of drying system and drying system |
| CN111336781A (en) * | 2020-04-09 | 2020-06-26 | 广州科思德科技有限公司 | Heat pump self-breathing type drying device and drying control method thereof |
| CN112229165B (en) * | 2020-11-04 | 2023-11-07 | 中国科学院理化技术研究所 | Horizontal heat pump drying system and working method thereof |
| CN115615153B (en) * | 2022-08-09 | 2024-06-07 | 珠海格力电器股份有限公司 | Drying system control method and device and drying system |
| CN115523741B (en) * | 2022-08-09 | 2023-12-19 | 青岛海尔空调器有限总公司 | Control method and device of heat pump dryer and heat pump dryer |
| CN115502065B (en) * | 2022-09-20 | 2023-07-25 | 一汽丰田汽车有限公司 | Method and device for determining backup mode of drying oven, electronic equipment and storage medium |
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