CN111329097A - Tobacco leaf drying device and control method thereof - Google Patents

Tobacco leaf drying device and control method thereof Download PDF

Info

Publication number
CN111329097A
CN111329097A CN202010265590.6A CN202010265590A CN111329097A CN 111329097 A CN111329097 A CN 111329097A CN 202010265590 A CN202010265590 A CN 202010265590A CN 111329097 A CN111329097 A CN 111329097A
Authority
CN
China
Prior art keywords
heat exchanger
bulb temperature
indoor
outdoor
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010265590.6A
Other languages
Chinese (zh)
Inventor
李福水
王双
唐道轲
吕东建
范轩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Haiwu Technology Co Ltd
Original Assignee
Guangdong Haiwu Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Haiwu Technology Co Ltd filed Critical Guangdong Haiwu Technology Co Ltd
Priority to CN202010265590.6A priority Critical patent/CN111329097A/en
Publication of CN111329097A publication Critical patent/CN111329097A/en
Pending legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24BMANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00Preparing tobacco in the factory
    • A24B3/10Roasting or cooling tobacco

Abstract

The invention relates to the technical field of heat exchangers, in particular to a tobacco leaf drying device and a control method of the device, wherein the tobacco leaf drying device comprises a controller, a first system and a second system; the first system comprises a first outdoor heat exchanger, a first compressor and a first indoor heat exchanger which are sequentially communicated, wherein the first indoor heat exchanger is communicated with the first outdoor heat exchanger through a first electronic expansion valve to form a closed loop; the second system is including the outdoor side heat exchanger of second that communicates the setting in proper order, the second compressor, the indoor side heat exchanger of second forms the closed loop through second electronic expansion valve and the outdoor side heat exchanger intercommunication of second, compared with the prior art, the unit of this application possesses the dehumidification function, need not reduce wet bulb temperature through the dehumidification fan, eliminate the calorific loss of dehumidification in-process, in whole baking process, need not dehumidify, the biggest remains tobacco leaf fragrance, send fragrant material not discharged, improve the tobacco leaf quality after drying.

Description

Tobacco leaf drying device and control method thereof
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a tobacco leaf drying device and a control method of the device.
Background
The open tobacco leaf drying unit used at present mainly absorbs heat from the outside to supply heat to the inside, is only used for increasing the temperature of dry balls, and has no dehumidification function; wet bulb temperature is through the high humid high temperature air of hydrofuge fan initiative discharge, introduces outdoor drying low temperature new trend passively, reduces the wet bulb temperature in the baking house, and the tobacco leaf that the drying need be dried, detailed technical scheme includes two parts: the first part, raising the temperature in the drying room: heating the dried tobacco leaves and ambient air in the drying room to increase the temperature of the dry balls in the drying room; the higher the temperature of the dry bulb in the air is, the larger the absolute moisture content of the corresponding saturated air is, the moisture in the dried tobacco leaves can be evaporated and separated out, the absolute moisture content in the air is increased, and the temperature of the wet bulb is increased until the moisture in the air reaches a saturated state at the corresponding ambient temperature. And the second part is used for reducing the temperature of wet balls in the drying room: the maximum moisture content is in a saturated state, when the moisture content reaches the maximum state, moisture in the tobacco leaves can not be evaporated and separated out, the moisture in the tobacco leaves can not be separated out continuously only by increasing the dry bulb temperature or reducing the wet bulb temperature, the upper temperature limit is set due to the characteristics of the tobacco leaves, the dry bulb temperature can not be increased without limit, otherwise the tobacco leaves can be damaged, and the drying is meaningless, so that the moisture in the tobacco leaves can be separated out continuously only by reducing the wet bulb temperature, and the tobacco leaves are further dried.
The method adopted at present is that the air with high temperature and high humidity is directly discharged out of the drying room by an indoor circulating fan in the drying room under positive pressure, and the fresh air with low temperature and low humidity outside enters the drying room under negative pressure. The temperature of the dry air balls in the drying room is reduced, the temperature of the wet air balls is also reduced, but the absolute moisture content is greatly increased, the moisture of the tobacco leaves can be separated out again, and the indoor circulating fan is repeatedly utilized to discharge moisture until the moisture content in the tobacco leaves meets the requirement. This kind of hydrofuge mode reduces wet bulb temperature through indoor circulating fan forced exhaust mode, also discharges indoor high temperature air outdoor simultaneously, has taken away most heat to reduce wet bulb temperature to outdoor hydrofuge mode through the fan, can take away some beneficial substance in the tobacco leaf, influence the final quality of tobacco leaf, the stoving effect is unsatisfactory.
Disclosure of Invention
The invention aims to provide a tobacco leaf drying device aiming at the defects in the prior art, and the problem of non-ideal drying effect can be solved by adopting the tobacco leaf drying device.
The purpose of the invention is realized by the following technical scheme: the application provides a tobacco leaf drying device, which comprises a controller, a first system and a second system; the first system comprises a first outdoor heat exchanger, a first compressor and a first indoor heat exchanger which are sequentially communicated, the first indoor heat exchanger is communicated with the first outdoor heat exchanger through a first electronic expansion valve to form a closed loop, the first indoor heat exchanger is also provided with a first throttling element and a first electromagnetic valve, a front section heat exchange tube of the first indoor heat exchanger is communicated with one end of the first throttling element, the other end of the first throttling element is communicated with a rear section heat exchange tube of the first indoor heat exchanger, and the first electromagnetic valve is connected with the first throttling element in parallel; the second system comprises a second outdoor heat exchanger, a second compressor and a second indoor heat exchanger which are sequentially communicated, the second indoor heat exchanger is communicated with the second outdoor heat exchanger through a second electronic expansion valve to form a closed loop, the second indoor heat exchanger is also provided with a second throttling element and a second electromagnetic valve, a front-section heat exchange tube of the second indoor heat exchanger is communicated with one end of the second throttling element, the other end of the second throttling element is communicated with a rear-section heat exchange tube of the second indoor heat exchanger, and the second electromagnetic valve is connected with the second throttling element in parallel; the bottom of the first indoor side heat exchanger and the bottom of the second indoor side heat exchanger are provided with water receiving discs; the first electronic expansion valve, the second electronic expansion valve, the first electromagnetic valve and the second electromagnetic valve are respectively electrically connected with the controller and are controlled by the controller.
The drying room is mainly applied to a drying room, the drying room is provided with a heating chamber communicated with the drying room and sealed with the drying room, an indoor circulating fan used for sending air flowing into the heating chamber from the drying room to the drying room is arranged in the heating chamber, a first indoor side heat exchanger and a second indoor side heat exchanger are arranged in the heating chamber, and the first outdoor side heat exchanger and the second outdoor side heat exchanger are arranged outside the drying room and exchange heat with the outside air.
The first system also comprises a first four-way valve, wherein a first group of interfaces of the first four-way valve are communicated with the first compressor, and a second group of interfaces of the first four-way valve are respectively communicated with the first outdoor heat exchanger and the first indoor heat exchanger; the second system also comprises a second four-way valve, a first group of interfaces of the second four-way valve are communicated with the second compressor, and a second group of interfaces of the second four-way valve are respectively communicated with the second outdoor heat exchanger and the second indoor heat exchanger.
The air outlet side of the first outdoor heat exchanger and the air outlet side of the second outdoor heat exchanger are respectively and correspondingly provided with a first outdoor fan and a second outdoor fan, or the air outlet side of the first outdoor heat exchanger and the air outlet side of the second outdoor heat exchanger share the same outdoor fan.
The controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened, so that the temperature of dry balls in the drying room is increased, and meanwhile, the temperature of wet balls is reduced.
The controller controls the first electromagnetic valve to be opened, the second electromagnetic valve to be opened, the temperature of the dry balls in the drying room is increased, and meanwhile the temperature of the wet balls is increased.
The controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be closed, so that the temperature of the dry pellets in the drying room is kept, and meanwhile, the temperature of the wet pellets is reduced.
The application also provides a control method of the tobacco leaf drying device, which comprises the following steps: firstly, setting an indoor target dry bulb temperature T, an indoor target wet bulb temperature L, a preset dry bulb temperature change efficiency value N and a preset indoor target wet bulb temperature change efficiency value M, and acquiring an indoor actual dry bulb temperature T1 and an actual wet bulb temperature L1 through a sensor or a sensing device; when the actual dry bulb temperature T1 is greater than the target dry bulb temperature T, the actual wet bulb temperature L1 is greater than the target wet bulb temperature L, the system needs to perform isothermal dehumidification, and an isothermal dehumidification mode of a first system or/and an isothermal dehumidification mode of a second system are/is operated; when the actual dry bulb temperature T1 is less than the target dry bulb temperature T, the actual wet bulb temperature L1 is less than the target wet bulb temperature L, the system needs to perform heating, and a heating mode of the first system or/and a heating mode of the second system are/is operated.
When the system needs isothermal dehumidification, firstly starting an isothermal dehumidification mode of a first system and setting a first system operation time S1, and acquiring an actual wet bulb temperature L2 after the first system operation time S1;
obtaining an actual efficiency wet bulb temperature change efficiency value M1 by dividing the difference value between the wet bulb temperature L2 and the wet bulb temperature L1 by the running time S1, and if the actual efficiency value M1 is less than or equal to the preset wet bulb temperature change efficiency value M, starting a second system; if the actual wet bulb temperature change efficiency value M1 is greater than the preset wet bulb temperature change efficiency value M, the second system is not started until the target wet bulb temperature L is met, and the device is stopped.
When the system needs to heat, the heating mode of the first system is started firstly, the first system running time S2 is set, and the actual dry bulb temperature T2 is obtained after the first system running time S2;
dividing the difference value of the dry bulb temperature T2 and the dry bulb temperature T1 by the running time S2 to obtain an actual dry bulb temperature change efficiency value N1, and if the actual dry bulb temperature change efficiency value N1 is smaller than or equal to a preset dry bulb temperature change efficiency value N, starting a second system; if the actual dry-bulb temperature change efficiency value N1 is greater than the preset dry-bulb temperature change efficiency value N, the second system is not started until the target dry-bulb temperature T is met, and the device is stopped.
The invention has the beneficial effects that: the utility model provides a tobacco leaf drying device, through setting up the indoor side heat exchanger of first indoor side heat exchanger and second, recycle the break-make that the controller controlled first solenoid valve and second solenoid valve, thereby make the heat exchanger can switch over to rising temperature with higher speed, the constant temperature dehumidification, the mode such as the dehumidification of rising temperature or constant temperature dehumidification with higher speed, the function is various and have fine suitability, thereby accurately with dry bulb temperature and wet bulb temperature control in certain precision range, be applicable to the environment that ambient temperature or ambient humidity control required height and use.
Compared with the prior art, the control method of the tobacco leaf drying device can save more energy, more accurately control the dry bulb temperature and the wet bulb temperature in the drying room, is high in energy saving benefit, and can well meet the requirements of various environment temperatures needed by tobacco leaves.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a tobacco leaf drying device of the present invention.
Reference numerals: the system comprises a first compressor 11, a first four-way valve 12, a first indoor side heat exchanger 13, a first water pan 14, a first dehumidification capillary tube 15, a first electromagnetic valve 16, a first electronic expansion valve 17, a first outdoor side heat exchanger 18, a first outdoor side fan 19, a second compressor 22, a second four-way valve 22, a second indoor side heat exchanger 23, a second water pan 24, a second dehumidification capillary tube 25, a second electromagnetic valve 26, a second electronic expansion valve 27, a second outdoor side heat exchanger 28, a second outdoor side fan 29, an indoor circulating fan 3, a heating chamber 4 and a drying chamber 5.
Detailed Description
The invention is further described with reference to the following examples.
According to a specific embodiment of the tobacco leaf drying device, as shown in fig. 1, the tobacco leaf drying device comprises a controller, a first system and a second system, wherein the first system comprises a first outdoor heat exchanger 18, a first four-way valve 12, a first compressor 11 and a first indoor heat exchanger 13 which are sequentially communicated, the first indoor heat exchanger 13 is communicated with the first outdoor heat exchanger 18 through a first electronic expansion valve 17 to form a closed loop, the first indoor heat exchanger 13 is further provided with a first throttling element and a first electromagnetic valve 16, the front section of a heat exchange tube of the first indoor heat exchanger 13 is communicated with one end of the first throttling element, the other end of the first throttling element is communicated with the rear section of the first indoor heat exchanger 13, and the first electromagnetic valve 16 is connected with the first throttling element in parallel; the second system comprises a second outdoor heat exchanger 28, a second four-way valve 22, a second compressor 22 and a second indoor heat exchanger 23 which are sequentially communicated, the second indoor heat exchanger 23 is communicated with the second outdoor heat exchanger 28 through a second electronic expansion valve 27 to form a closed loop, the second indoor heat exchanger 23 is also provided with a second throttling element and a second electromagnetic valve 26, a front-section heat exchange tube of the second indoor heat exchanger 23 is communicated with one end of the second throttling element, the other end of the second throttling element is communicated with a rear-section heat exchange tube of the second indoor heat exchanger 23, and the second electromagnetic valve 26 is connected with the second throttling element in parallel; the bottom of the first indoor side heat exchanger 13 and the bottom of the second indoor side heat exchanger 23 are respectively provided with a first water pan 14 and a second water pan 24; the first electronic expansion valve 17, the second electronic expansion valve 27, the first solenoid valve 16 and the second solenoid valve 26 are electrically connected to and controlled by the controller, respectively.
The tobacco leaf drying device of the embodiment is mainly applied to a drying room 5, the drying room 5 is provided with a heating chamber 4 which is communicated with the drying room and is closed, an indoor circulating fan 3 which is used for sending air flowing into the heating chamber 4 from the drying room back to the drying room is arranged in the heating chamber 4, a first indoor side heat exchanger 13 and a second indoor side heat exchanger 24 are installed in the heating chamber 4, and a first outdoor side heat exchanger 18 and a second outdoor side heat exchanger 28 are installed outside the drying room 4 and exchange heat with outside air.
In the embodiment, the first system is provided with a first four-way valve 12, a first group of interfaces of the first four-way valve 12 are communicated with the first compressor 11, and a second group of interfaces of the first four-way valve 12 are respectively communicated with a first outdoor heat exchanger 18 and a first indoor heat exchanger 13; the second system is provided with a second four-way valve 22, a first set of interfaces of the second four-way valve 22 being in communication with the second compressor 21, and a second set of interfaces of the second four-way valve 22 being in communication 23 with a second outdoor side heat exchanger 28 and a second indoor side heat exchanger, respectively. When the cooling mode is required to be turned on for dehumidification, the first and second systems may be converted into the cooling mode by the first and second four-way valves 12 and 22, thereby dehumidifying the indoor space.
In the present embodiment, the first throttling element and the second throttling element are respectively provided with the first dehumidification capillary tube 15 and the second dehumidification capillary tube 25, and the first throttling element and the second throttling element mainly perform a throttling function, and the throttling elements further include an expansion valve, a throttling valve, a solenoid valve, and the like.
First indoor side heat exchanger 13 and the equal slope setting of second indoor side heat exchanger 23, in this embodiment, first indoor side heat exchanger 13 and second indoor side heat exchanger 23 are the shape of falling V and arrange to, first indoor side heat exchanger 13 corresponds respectively with the below of second indoor side heat exchanger 23 and is provided with first water collector 14 and second water collector 24. The function of the device is to facilitate the rapid collection and guide of the condensed water from the corresponding water pan. In another arrangement, the first indoor heat exchanger 13 and the second indoor heat exchanger 23 are arranged in a V shape, and the first indoor heat exchanger 13 and the second indoor heat exchanger 23 share the same water pan.
In this embodiment, the air outlet side of the first outdoor heat exchanger 18 and the air outlet side of the second outdoor heat exchanger 28 are respectively provided with a first outdoor fan 19 and a second outdoor fan 29, or the air outlet side of the first outdoor heat exchanger 19 and the air outlet side of the second outdoor heat exchanger 29 share the same outdoor fan, specifically, the first outdoor heat exchanger 19 and the second outdoor heat exchanger 28 may be stacked, and then an outdoor fan is provided on the air outlet side, or the first outdoor heat exchanger 19 and the second outdoor heat exchanger 28 are tiled to provide a large outdoor fan.
As a modification, the first electronic expansion valve 17, the second electronic expansion valve 27, the first solenoid valve 16 and the second solenoid valve 26 are electrically connected to and controlled by a controller, respectively. In this embodiment, the controller controls the first electronic expansion valve 17, the second electronic expansion valve 27, the first solenoid valve 16 and the second solenoid valve 26 to open or close, respectively, so as to enable the tobacco leaf drying device to enter different operation mode modes.
In the first mode, the temperature of dry pellets in the drying room 5 is increased, and the temperature of wet pellets is increased. The specific implementation method and control mode are as follows: the first system implements the heating mode (first solenoid valve 16 open) refrigerant path: the first compressor 11 is started to compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure refrigerant, and the high-temperature high-pressure refrigerant is sent to the first indoor heat exchanger 13 of the drying room 5 through the first four-way valve 12; the high-temperature gaseous refrigerant is condensed and releases heat in the first indoor heat exchanger 13, flows through the first electromagnetic valve 16 and then flows through the heat exchanger behind the electromagnetic valve to become a supercooled liquid refrigerant; the supercooled liquid refrigerant passes through a first electronic expansion valve 17, is throttled and depressurized, is changed into a medium-temperature low-pressure liquid refrigerant, then enters a first outdoor side heat exchanger 18, absorbs heat from an outdoor air environment, and is changed into a low-temperature gas refrigerant after being heated and evaporated; and then returns to the first compressor 11, and is then compressed by the compressor and discharged, and the cycle is repeated. The second system implements the heating mode (second solenoid valve 26 open) refrigerant path: the second compressor 22 is started to compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure refrigerant, the high-temperature high-pressure refrigerant is sent to the second indoor side heat exchanger 23 of the drying room 5 through the second four-way valve 22, the high-temperature gaseous refrigerant is condensed and released heat in the second indoor side heat exchanger 23, flows through the second electromagnetic valve 26 and then flows through the heat exchanger behind the electromagnetic valve to become a supercooled liquid refrigerant; the supercooled liquid refrigerant passes through a second electronic expansion valve 27, is throttled and depressurized to become a medium-temperature low-pressure liquid refrigerant, then enters a second outdoor heat exchanger 28, absorbs heat from the outdoor air environment, and is heated and evaporated to become a low-temperature gas refrigerant; and then back to the second compressor 22 where it is compressed again and discharged for a reciprocating cycle.
In the first mode, the drying room 5 has an indoor air heat exchange working path: and (3) starting the indoor circulating fan 3, driving the air in the drying room 5 from the air return inlet at the lower part to enter the unit, indirectly exchanging heat with the high-temperature refrigerants in the first indoor side heat exchanger 13 and the second indoor side heat exchanger 23, heating, and discharging the heated air from the air outlet at the upper part into the drying room 5.
In mode one, the drying room 5 outdoor side air working path: the first outdoor fan 19 and the second outdoor fan 29 are turned on to indirectly exchange heat between the outside ambient air and the low-temperature and low-pressure refrigerant in the first outdoor heat exchanger 18 and the second outdoor heat exchanger 28, and the cooled air is discharged.
According to the difference value between the set target temperature and the temperature detected in the actual drying room 5, one system can be selected to be opened, and the two systems can also be opened simultaneously, so that the target temperature setting requirement can be met, the frequent starting of the unit can be reduced, and the energy consumption is reduced.
And in the second mode, the temperature of dry pellets in the drying room 5 is increased, and the temperature of wet pellets is reduced. The specific implementation method and path are as follows: the unit is a dual system, in order to simultaneously realize the increase of the dry bulb temperature and the reduction of the wet bulb temperature, the two systems need to start different working modes, one system starts an isothermal dehumidification mode, the other system starts a heating mode, and the first system is supposed to start the isothermal dehumidification mode, and the second system starts the heating mode. The first system implements isothermal dehumidification mode (first solenoid valve 16 closed) refrigerant path: the first compressor 11 is started to compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure refrigerant, and the high-temperature high-pressure refrigerant is sent to the first indoor heat exchanger 13 of the drying room 5 through the first four-way valve 12; the high-temperature gaseous refrigerant is condensed and releases heat in the first indoor side heat exchanger 13, flows through the first dehumidification capillary tube 15, is throttled and depressurized, then enters the rear-section heat exchanger of the first system indoor side heat exchanger, is partially evaporated, is changed into medium-temperature and medium-pressure gas-liquid mixed refrigerant, enters the first electronic expansion valve 17, is throttled and depressurized again, is changed into low-pressure refrigerant, then enters the first outdoor side heat exchanger 18, absorbs heat from the outdoor air environment, and is changed into low-temperature gas refrigerant; and then returns to the first compressor 11, and is then compressed by the compressor and discharged, and the cycle is repeated. The second system implements the heating mode (second solenoid valve 26 open) refrigerant path: the second compressor 22 is started to compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure refrigerant, and the high-temperature high-pressure refrigerant is sent to the second indoor heat exchanger 23 of the drying room 5 through the second four-way valve 22; the high-temperature gaseous refrigerant is condensed and releases heat in the second indoor heat exchanger 23, flows through the second electromagnetic valve 26 and then flows through the heat exchanger behind the electromagnetic valve to become a supercooled liquid refrigerant; the supercooled liquid refrigerant passes through a second electronic expansion valve 27, is throttled and depressurized to become a medium-temperature low-pressure liquid refrigerant, then enters a 6-second system outdoor heat exchanger, absorbs heat from an outdoor air environment, and is heated and evaporated to become a low-temperature gas refrigerant; and then back to the second compressor 22 where it is compressed again and discharged for a reciprocating cycle.
In mode two, the drying room 5 indoor side air working path: the indoor circulating fan 3 is started to drive air in the drying room 5 to enter the unit from an air return inlet at the lower part, the air exchanges heat with high-temperature refrigerants in the first indoor side heat exchanger 13 and the second indoor side heat exchanger 23, the air passing through the first system is partially heated, the other part of the air is cooled, meanwhile, moisture in the air is changed into condensate water to be separated out, the overall air outlet temperature is kept unchanged, the condensate water is received by the first water pan 14 and is discharged to the outdoor side through a drain pipe, the air passing through the second system indoor side heat exchanger is heated and then is mixed with the air passing through the first system without dry bulb temperature change (wet bulb temperature reduction) and then is discharged into the drying room 5 from an air outlet at the upper part, the whole dry bulb temperature is increased, and the wet bulb temperature is reduced;
in mode two, the drying room 5 outdoor side air working path: the first outdoor fan 19 and the second outdoor fan 29 are turned on to indirectly exchange heat between the outside ambient air and the low-temperature and low-pressure refrigerant in the first outdoor heat exchanger 18 and the second outdoor heat exchanger 28, and the cooled air is discharged. It should be noted that, in addition to the above control mode, the heating mode may be started by the first system, and the isothermal dehumidification mode may be started by the second system, and the working paths are the same and are not described again, so that the dry bulb temperature may be increased and the wet bulb temperature may be decreased.
And in the third mode, the temperature of the dry bulb in the drying room 5 is kept, and the temperature of the wet bulb is reduced. The specific implementation method and path are as follows: the first system implements isothermal dehumidification mode (first solenoid valve 16 closed) refrigerant path: the first compressor 11 is started to compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure refrigerant, and the high-temperature high-pressure refrigerant is sent to the first indoor heat exchanger 13 of the drying room 5 through the first four-way valve 12; the high-temperature gaseous refrigerant is condensed and releases heat in the first indoor side heat exchanger 13, flows through the first dehumidification capillary tube 15, is throttled and depressurized, then enters the rear-section heat exchanger of the first system indoor side heat exchanger, is partially evaporated, is changed into medium-temperature and medium-pressure gas-liquid mixed refrigerant, enters the first electronic expansion valve 17, is throttled and depressurized again, is changed into low-pressure refrigerant, then enters the first outdoor side heat exchanger 18, absorbs heat from the outdoor air environment, and is changed into low-temperature gas refrigerant; and then returns to the first compressor 11, and is then compressed by the compressor and discharged, and the cycle is repeated. The second system implements an isothermal dehumidification mode (the second electromagnetic valve 26 is closed) or a non-operation state, and determines whether to start the second system to operate according to the difference between the detected wet bulb temperature and the target wet bulb temperature. A refrigerant path: the second compressor 22 is started to compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure refrigerant, and the high-temperature high-pressure refrigerant is sent to the second indoor heat exchanger 23 of the drying room 5 through the second four-way valve 22; the high-temperature gaseous refrigerant is condensed and releases heat in the second indoor side heat exchanger 23, flows through the second dehumidification capillary tube 25, is throttled and depressurized, then enters the rear-section heat exchanger of the second system indoor side heat exchanger, is partially evaporated to become medium-temperature and medium-pressure gas-liquid mixed refrigerant, enters the second electronic expansion valve 27, is throttled and depressurized again to become low-pressure refrigerant, then enters the 6-second system outdoor heat exchanger, absorbs heat from the outdoor air environment, and becomes low-temperature gas refrigerant; and then back to the second compressor 22 where it is compressed again and discharged for a reciprocating cycle.
In mode three, the drying room 5 indoor side air working path: open indoor circulating fan 3, the air enters into the unit from the return air inlet of lower part in the drive baking house 5, with the heat transfer of the high temperature refrigerant in first indoor side heat exchanger 13, the indoor side heat exchanger 23 of second, the air part through first and two systems is heated, another part is cooled down, moisture in the air becomes the comdenstion water simultaneously and separates out, the total air-out temperature keeps unchangeable, the comdenstion water is received by the water collector, discharge to the outdoor side through the drain pipe, dry bulb temperature keeps unchangeable, wet bulb temperature drops.
In mode three, the drying room 5 outdoor side air working path: the first outdoor fan 19 and the second outdoor fan 29 are turned on to indirectly exchange heat between the outside ambient air and the low-temperature and low-pressure refrigerant in the first outdoor heat exchanger 18 and the second outdoor heat exchanger 28, and the cooled air is discharged.
Compared with the prior art, the tobacco leaf drying device has the advantages that the unit has a dehumidification function, the temperature of a wet bulb does not need to be reduced through the dehumidification fan, and heat loss in the dehumidification process is eliminated; not only can realize the isothermal dehumidification function, but also can ensure that the temperature of the dry bulb and the temperature of the wet bulb are within the controllable precision range; the wet bulb temperature is reduced by dehumidification, fresh air does not need to be introduced and high-temperature air does not need to be discharged, and the influence of outdoor environment temperature is reduced; in addition, the structure of the evaporator is optimized, the wind resistance of an indoor fan is reduced, the efficiency of the fan and the energy efficiency ratio of the whole machine are improved, and the operation cost is reduced, so that the heating and dehumidifying functions are realized, and the temperature of the dry bulb and the temperature of the wet bulb are ensured to be within the controllable precision range; particularly, in the whole baking process, moisture is not required to be discharged, the fragrance of the tobacco leaves is kept to the maximum extent, fragrant substances are not discharged, and the quality of the dried tobacco leaves is improved.
In the control method of the tobacco leaf drying device of the embodiment, the sensor is firstly arranged according to the target area to be adjusted, and the sensor is arranged in the drying room 5 at a horizontal distance of 1.5 meters from the air inlet in the embodiment. The sensor may be a single dry bulb temperature sensor and a single wet bulb temperature sensor, or may be a sensor device that detects both dry bulb and wet bulb temperatures. In addition, in the embodiment, the temperature of the dry bulb and the wet bulb of the drying room is mainly adjusted, so that if the temperature sensor is used for controlling the humidity of a certain space, the temperature sensor is directly replaced by a humidity sensor.
The method comprises the following steps: firstly, setting an indoor target dry bulb temperature T, an indoor target wet bulb temperature L, a preset dry bulb temperature change efficiency value N and a preset indoor target wet bulb temperature change efficiency value M through a controller, and acquiring an indoor actual dry bulb temperature T1 and an actual wet bulb temperature L1 through a sensor or a sensing device; when the actual dry bulb temperature T1 is greater than the target dry bulb temperature T, the actual wet bulb temperature L1 is greater than the target wet bulb temperature L, the system needs to perform isothermal dehumidification, and an isothermal dehumidification mode of a first system or/and an isothermal dehumidification mode of a second system are/is operated; when the actual dry bulb temperature T1 is less than the target dry bulb temperature T, the actual wet bulb temperature L1 is less than the target wet bulb temperature L, the system needs to perform heating, and a heating mode of the first system or/and a heating mode of the second system are/is operated.
In order to save energy consumption, when the system needs to perform isothermal dehumidification, firstly starting an isothermal dehumidification mode of a first system and setting a first system operation time S1, and after the first system operation time S1, acquiring an actual wet bulb temperature L2; obtaining an actual efficiency wet bulb temperature change efficiency value M1 by dividing the difference value between the wet bulb temperature L2 and the wet bulb temperature L1 by the running time S1, and if the actual efficiency value M1 is less than or equal to the preset wet bulb temperature change efficiency value M, starting a second system; if the actual wet bulb temperature change efficiency value M1 is greater than the preset wet bulb temperature change efficiency value M, the second system is not started until the target wet bulb temperature L is met, and the device is stopped.
In order to save energy consumption, when the system needs to be heated, the heating mode of the first system is started firstly, the first system operation time S2 is set, and after the first system operation time S2, the actual dry bulb temperature T2 is obtained; dividing the difference value of the dry bulb temperature T2 and the dry bulb temperature T1 by the running time S2 to obtain an actual dry bulb temperature change efficiency value N1, and if the actual dry bulb temperature change efficiency value N1 is smaller than or equal to a preset dry bulb temperature change efficiency value N, starting a second system; if the actual dry-bulb temperature change efficiency value N1 is greater than the preset dry-bulb temperature change efficiency value N, the second system is not started until the target dry-bulb temperature T is met, and the device is stopped.
Compared with the prior art, the control method of the tobacco leaf drying device can save more energy, more accurately control the dry bulb temperature and the wet bulb temperature in the drying room, save energy, have high benefit, and can well meet the requirements of various environment temperatures needed by tobacco leaves.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a tobacco leaf drying device which characterized in that: the system comprises a controller, a first system and a second system;
the first system comprises a first outdoor heat exchanger, a first compressor and a first indoor heat exchanger which are sequentially communicated, wherein the first indoor heat exchanger is communicated with the first outdoor heat exchanger through a first electronic expansion valve to form a closed loop;
the second system comprises a second outdoor heat exchanger, a second compressor and a second indoor heat exchanger which are sequentially communicated, the second indoor heat exchanger is communicated with the second outdoor heat exchanger through a second electronic expansion valve to form a closed loop, the second indoor heat exchanger is also provided with a second throttling element and a second electromagnetic valve, a front-section heat exchange tube of the second indoor heat exchanger is communicated with one end of the second throttling element, the other end of the second throttling element is communicated with a rear-section heat exchange tube of the second indoor heat exchanger, and the second electromagnetic valve is connected with the second throttling element in parallel;
the bottom of the first indoor side heat exchanger and the bottom of the second indoor side heat exchanger are provided with water receiving discs;
the first electronic expansion valve, the second electronic expansion valve, the first electromagnetic valve and the second electromagnetic valve are respectively electrically connected with the controller and controlled by the controller.
2. The tobacco leaf drying device according to claim 1, characterized in that: the main baking house that is applied to, the baking house is provided with rather than intercommunication and confined heating chamber, be provided with the indoor circulating fan who is used for sending back the air that the baking house flowed into the heating chamber to the baking house in the heating chamber, first indoor side heat exchanger and the indoor side heat exchanger of second are installed in the heating chamber, first outdoor side heat exchanger and the outdoor side heat exchanger of second are installed the baking house outside produces the heat exchange with the outside air.
3. The tobacco leaf drying device according to claim 1, characterized in that: the first system also comprises a first four-way valve, wherein a first group of interfaces of the first four-way valve are communicated with the first compressor, and a second group of interfaces of the first four-way valve are respectively communicated with the first outdoor heat exchanger and the first indoor heat exchanger; the second system also comprises a second four-way valve, wherein a first group of interfaces of the second four-way valve are communicated with the second compressor, and a second group of interfaces of the second four-way valve are respectively communicated with the second outdoor heat exchanger and the second indoor heat exchanger.
4. The tobacco leaf drying device according to claim 1, characterized in that: the air outlet side of the first outdoor heat exchanger and the air outlet side of the second outdoor heat exchanger are respectively and correspondingly provided with a first outdoor fan and a second outdoor fan, or the air outlet side of the first outdoor heat exchanger and the air outlet side of the second outdoor heat exchanger share the same outdoor fan.
5. The tobacco leaf drying device according to claim 1, characterized in that: the controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened, so that the temperature of dry balls in the drying room is increased, and meanwhile, the temperature of wet balls is reduced.
6. The tobacco leaf drying device according to claim 1, characterized in that: the controller controls the first electromagnetic valve to be opened, the second electromagnetic valve to be opened, the temperature of the dry balls in the drying room is increased, and meanwhile, the temperature of the wet balls is increased.
7. The tobacco leaf drying device according to claim 6, characterized in that: the controller controls the first electromagnetic valve to be closed, the second electromagnetic valve to be closed, the temperature of the dry bulb in the drying room is kept, and meanwhile, the temperature of the wet bulb is reduced.
8. A control method of a tobacco leaf drying device is characterized by comprising the following steps:
firstly, setting an indoor target dry bulb temperature T, an indoor target wet bulb temperature L, a preset dry bulb temperature change efficiency value N and a preset indoor target wet bulb temperature change efficiency value M, and acquiring an indoor actual dry bulb temperature T1 and an actual wet bulb temperature L1 through a sensor or a sensing device;
when the actual dry bulb temperature T1 is greater than the target dry bulb temperature T, the actual wet bulb temperature L1 is greater than the target wet bulb temperature L, the system needs to perform isothermal dehumidification, and an isothermal dehumidification mode of a first system or/and an isothermal dehumidification mode of a second system are/is operated;
when the actual dry bulb temperature T1 is less than the target dry bulb temperature T, the actual wet bulb temperature L1 is less than the target wet bulb temperature L, the system needs to perform heating, and a heating mode of the first system or/and a heating mode of the second system are/is operated.
9. The tobacco leaf drying device according to claim 8, characterized in that: when the system needs isothermal dehumidification, firstly starting an isothermal dehumidification mode of a first system and setting a first system operation time S1, and acquiring an actual wet bulb temperature L2 after the first system operation time S1;
obtaining an actual efficiency wet bulb temperature change efficiency value M1 by dividing the difference value between the wet bulb temperature L2 and the wet bulb temperature L1 by the running time S1, and if the actual efficiency value M1 is less than or equal to the preset wet bulb temperature change efficiency value M, starting a second system; if the actual wet bulb temperature change efficiency value M1 is greater than the preset wet bulb temperature change efficiency value M, the second system is not started until the target wet bulb temperature L is met, and the device is stopped.
10. The tobacco leaf drying device according to claim 8, characterized in that: when the system needs to heat, a heating mode of a first system is started firstly, first system running time S2 is set, and after the first system running time S2, actual dry bulb temperature T2 is obtained;
dividing the difference value of the dry bulb temperature T2 and the dry bulb temperature T1 by the running time S2 to obtain an actual dry bulb temperature change efficiency value N1, and if the actual dry bulb temperature change efficiency value N1 is smaller than or equal to a preset dry bulb temperature change efficiency value N, starting a second system; if the actual dry-bulb temperature change efficiency value N1 is greater than the preset dry-bulb temperature change efficiency value N, the second system is not started until the target dry-bulb temperature T is met, and the device is stopped.
CN202010265590.6A 2020-04-07 2020-04-07 Tobacco leaf drying device and control method thereof Pending CN111329097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010265590.6A CN111329097A (en) 2020-04-07 2020-04-07 Tobacco leaf drying device and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010265590.6A CN111329097A (en) 2020-04-07 2020-04-07 Tobacco leaf drying device and control method thereof

Publications (1)

Publication Number Publication Date
CN111329097A true CN111329097A (en) 2020-06-26

Family

ID=71175280

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010265590.6A Pending CN111329097A (en) 2020-04-07 2020-04-07 Tobacco leaf drying device and control method thereof

Country Status (1)

Country Link
CN (1) CN111329097A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112841077A (en) * 2020-12-28 2021-05-28 珠海格力电器股份有限公司 Temperature control method, breeding temperature control system, storage medium and terminal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112841077A (en) * 2020-12-28 2021-05-28 珠海格力电器股份有限公司 Temperature control method, breeding temperature control system, storage medium and terminal
CN112841077B (en) * 2020-12-28 2021-12-24 珠海格力电器股份有限公司 Temperature control method, breeding temperature control system, storage medium and terminal

Similar Documents

Publication Publication Date Title
CN205048940U (en) Drying and dehumidification unit
CN104019643B (en) With the agricultural product Analysis of Heat Pump Drying System of Waste Heat Recovery
CN105021013A (en) Heat pump drying system with sensible heat recovery function and multi-effect dehumidification function
CN101900379B (en) There is the energy-saving dehumidifier of room temperature regulation function
CN109237925B (en) Heat pump control system for dehumidification and drying
CN204730617U (en) A kind of heat accumulating type solar energy of back-heating type and heat pump united drying system
CN104776709A (en) Multifunctional drying system integrating solar energy and heat pump
CN201527054U (en) Air conditioner
CN111329097A (en) Tobacco leaf drying device and control method thereof
CN210374155U (en) Reheating and dehumidifying integrated refrigerating system
CN204881113U (en) Solar energy and heat pump be multi -functional drying system of integration jointly
CN201163119Y (en) Energy-saving air conditioner
CN202521763U (en) Heat pump air conditioner with dehumidification function
CN204612235U (en) A kind of Special Agriculture Product heat pump assembly realizing oven dry and cold storage function
CN211861778U (en) Tobacco leaf drying device
CN109489402A (en) A kind of dehumidifying drying heat pump control method
CN103868271B (en) Double electronic expansion-valve heat pump dehumidification dryer
CN203949470U (en) Dehumidifying drying heat hot pump assembly
CN203295854U (en) Clothes drying system based on CO2 trans-critical heat pump circulating system
CN211667926U (en) Fresh air dehumidification all-in-one
CN205048943U (en) Novel dehumidifying heat pump drying unit
CN204141974U (en) Rapidly pre-warming type air source heat pump dryer
CN101526248A (en) Energy-saving electric heating humidification system for air conditioner and control method thereof
CN111588065A (en) Solar heat pump drying system with open-close type circulation
CN110584177A (en) Multifunctional heat pump drying system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination