CN109682201B - Air energy grain drying, refrigerating and energy-saving integrated device and intelligent control method thereof - Google Patents

Air energy grain drying, refrigerating and energy-saving integrated device and intelligent control method thereof Download PDF

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Publication number
CN109682201B
CN109682201B CN201910110798.8A CN201910110798A CN109682201B CN 109682201 B CN109682201 B CN 109682201B CN 201910110798 A CN201910110798 A CN 201910110798A CN 109682201 B CN109682201 B CN 109682201B
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China
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air
heat pump
pump system
cold
door
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CN109682201A (en
Inventor
王素珍
钱生越
朱春城
马建宏
周德龙
孟琴
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NANJING AGRICULTURAL MACHINERY TECHNOLOGY EXTENSION STATION
Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
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NANJING AGRICULTURAL MACHINERY TECHNOLOGY EXTENSION STATION
Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
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Priority to CN201910110798.8A priority Critical patent/CN109682201B/en
Publication of CN109682201A publication Critical patent/CN109682201A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • 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
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D13/00—Stationary devices, e.g. cold-rooms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Abstract

The invention discloses an air energy grain drying, refrigerating and energy-saving integrated device which comprises a remote monitoring center, a heat pump system, drying equipment, a refrigeration house and cold air recovery equipment, wherein the heat pump system is arranged in the remote monitoring center; the cold air recovery device comprises a first air door, a second air door, a cold air output pipe, a cold storage air supply pipe, a cold storage return pipe and an air input pipe; the cold air output port of the heat pump system is respectively connected with a cold storage air supply pipe and a cold air output pipe through a first air door, the cold storage air supply pipe is connected between the first air door and the cold storage air inlet, and the first air door is in a first communication state and a second communication state; the air inlet of the heat pump system is respectively connected with the air input pipe and the refrigeration house return air pipe through a second air door, the refrigeration house return air pipe is connected between the second air door and the refrigeration house return air inlet, and the second air door is in a third communication state and a fourth communication state. The invention realizes the recycling of the cold air by adding the cold air recycling device, realizes the design of an integrated device for drying and refrigerating grains, and achieves the effect of multiple purposes of one machine.

Description

Air energy grain drying, refrigerating and energy-saving integrated device and intelligent control method thereof
Technical Field
The invention relates to the technical field of low carbon environment protection in grain drying and storage, in particular to an air energy grain drying, refrigerating and energy-saving integrated device and an intelligent control method thereof.
Background
According to the agricultural and rural economic development targets, grain drying is an important component of the links of grain non-falling warehousing operation in grain production, such as cultivation, seeding, harvesting, drying and the like, and is the last link with large workload, short operation time and high operation requirement. However, on one hand, many existing grain drying equipment still adopts high-energy consumption, high-pollution and low-automation-degree coal (fuel oil) burning hot blast stove as main heat source, and has the problems of high energy consumption, high emission of pollutants such as smoke dust, carbon dioxide, sulfur dioxide and the like; on the other hand, some grain dryers using clean energy sources can result in energy waste during the drying process.
The patent ZL201210568843.2 'air energy thermal cycle drying and cold air recovery device and automatic temperature control method' is provided with the following steps: and a backheating pipeline is arranged at the top of the drying room to recover the waste heat baked in the drying room, the dehumidifier dehumidifies moist hot air to form dried air, the dried air is conveyed into an air energy heat pump to be slightly heated, and finally, the heat is input into the drying room through a heat pipe to be reused. However, this patent only recovers the waste heat baked in the drying room, and does not consider the characteristics of the air energy heat pump. According to the reverse Carnot principle, the heat pump system absorbs heat in the air, then the heat is changed into heat to be transferred into the grain dryer, low-temperature cold air losing a large amount of energy is discharged into the atmosphere, the power of an exhaust fan is required to be large, the air output is large, electric energy waste is caused, and vibration noise is generated to influence the environment.
Disclosure of Invention
The invention aims to provide an air energy grain drying and refrigerating energy-saving integrated device and an intelligent control method thereof, which are used for realizing cold air recycling by adding a cold air recycling device and slightly modifying a heat pump system in consideration of the fact that grains are required to enter a refrigerator for refrigerating and preserving immediately after being dried, so that the design of the grain drying and refrigerating integrated device is realized, and the effect of multiple purposes of one machine is achieved. Not only can realize the aims of three low and three high (low loss, low pollution, low cost, high quality, high nutrition and high benefit) of grain storage; and the grain storage is driven to develop towards the direction of ecology and green, the application of clean energy in agricultural production is driven, and the transformation of agricultural machinery working towards the aspects of green energy conservation, emission reduction, quality improvement and synergy is promoted.
In order to achieve the above purpose, in combination with fig. 1, the invention provides an air energy grain drying, refrigerating and energy saving integrated device, which comprises a remote monitoring center, a heat pump system, drying equipment, a refrigeration house and cold air recovery equipment.
The refrigerator is provided with a refrigerator air inlet and a refrigerator air return opening. Cool air enters the refrigerator from the air inlet of the refrigerator and is discharged out of the refrigerator from the air return opening of the refrigerator, so that the grains stored in the refrigerator are cooled.
The drying equipment is provided with a hot air inlet and an exhaust outlet. The hot air enters the accommodating cavity of the drying equipment from the hot air inlet, and leaves the drying equipment through the accommodating cavity and the waste gas outlet, so as to dry grains in the accommodating cavity.
The heat pump system comprises an air inlet, a hot air output port and a cold air output port, extracts heat energy of gas input through the air inlet through heat exchange, conveys cold air discharged after heat exchange to the cold air output port, and conveys hot air to the hot air output port.
The hot air outlet is communicated with a hot air inlet of the drying equipment through a hot air supply pipe.
In some examples, the heat pump system includes a heat pump unit, an evaporator, a condenser, and a heat pump system controller electrically connected to the evaporator, the condenser, and the heat pump unit, respectively, to control an operating state of the heat pump unit, the evaporator, and the condenser.
The evaporator is arranged to refrigerate the gas entering through the gas inlet and output the cooled gas to the cold gas output port according to the control instruction of the heat pump system controller, and the released heat energy is conveyed to the condenser.
The condenser is arranged to heat the gas entering through the gas inlet and then output the heated gas to the hot air output port according to a control instruction of the heat pump system controller, and the discharged cold air is conveyed to the evaporator.
It should be understood that the type of the heat pump system is not limited to the foregoing one, and in fact, the heat pump system can meet the requirements of the air energy grain drying, refrigerating and energy saving integrated device provided by the invention as long as the heat exchange function can be realized to separate and output cold and hot gases.
Preferably, the heat pump unit adopts a 1-dragn modularized unit. And N is configured according to the drying power.
The heat pump system has two modes of heating and cooling:
when the heat pump system is in the heating mode, the heat pump system extracts heat energy of gas input through the air inlet through heat exchange, cold air discharged after heat exchange is conveyed to the cold air output port, and hot air is conveyed to the hot air output port.
When the heat pump system is in the refrigeration mode, the heat pump system cools the gas input through the gas inlet and then conveys the cooled gas to the cool air output port.
When the heat pump system works in a heating mode, the air energy heat pump hot air unit has the basic function of providing a heat source for grain drying equipment, and the heat source can continuously and automatically run for 24 hours to provide stable hot air for the drying equipment; the heat pump system realizes cold and hot gas separation, and cold air discharged after passing through the heat exchange system is directly conveyed to the refrigeration house for refrigerating and preserving grains, so that recycling of resources is realized.
When the grains do not need to be dried but low-temperature refrigeration ventilation is needed, the cooling is switched to 'refrigeration', and at the moment, low-temperature low-humidity cold air output by the evaporator end of the heat pump system is directly sent to a refrigeration house through a cold air supply pipe.
Preferably, a key of a working mode is arranged, and the switching of heating and refrigerating modes is intelligently realized through the key of the working mode, so that manual operation is not needed, and the utilization rate of equipment can be improved.
When the heat pump system controller is in a heating mode, hot air is output from the condenser end of the heat pump system and is sent to the drying equipment through the hot air supply pipe, and then exhaust gas is discharged from the exhaust gas outlet of the drying equipment to form an open loop system.
And cold air output by the evaporator end of the heat pump system is sent to the refrigeration house through the refrigeration house air supply pipe, and the refrigeration house air return opening is then sent to the inlet end of the evaporator of the heat pump system through the refrigeration house air return pipe, so that a closed loop system is finally formed.
The cold air recovery device comprises a first air door, a second air door, a cold air output pipe, a cold storage air supply pipe, a cold storage return pipe and an air input pipe.
The cold air output port of the heat pump system is connected with the cold storage air supply pipe and the cold air output pipe through the first air door respectively, the cold storage air supply pipe is connected between the first air door and the cold storage air inlet, and the first air door is provided with a first communication state and a second communication state:
when the first air door is in a first communication state, the cold air output port of the heat pump system is communicated with the cold storage air supply pipe, and when the first air door is in a second communication state, the cold air output port of the heat pump system is communicated with the redundant cold air output pipe. As shown in FIG. 1, the first air door works in two states, AB and AC respectively, when the first air door is in the AB state, the recovered cold air can be controlled to enter the refrigerator for recycling, and when the first air door is in the AC state, the recovered redundant cold air can be controlled to be discharged into the atmosphere through the redundant cold air output pipe or used for other purposes.
The air inlet of the heat pump system is connected with the air input pipe and the air return pipe of the refrigeration house through a second air door respectively, the air return pipe of the refrigeration house is connected between the second air door and the air return opening of the refrigeration house, and the second air door is provided with a third communication state and a fourth communication state:
when the second air door is in a third communication state, an air inlet of the heat pump system is communicated with a refrigeration house return air pipe; when the second air door is in a fourth communication state, the air inlet of the heat pump system is communicated with the air input pipe. As shown in FIG. 1, the second air door works in two states, namely A1B1 and A1C1, when the second air door is in the state A1B1, the exhaust gas discharged by the refrigeration house can be controlled to be input into the heat pump system for recycling, and when the second air door is in the state A1C1, the external air can enter the heat pump system.
In addition, when first air door and second air door are in AB and A1B1 state respectively, the freezer system is in the circulation refrigeration state, and heat pump system constantly carries the air conditioning in to the freezer, and freezer temperature drops gradually, and the heat energy that this in-process released is retrieved to heat pump system, carries drying equipment after handling through heat pump system in order to realize the stoving function, and at this moment, heat pump system all comes from the freezer for drying equipment provides heat.
When the first air door and the second air door are respectively in the states of AC and A1C1, the refrigeration house system is in a closed state, and the heat pump system does not cool the refrigeration house any more. If the drying equipment is started at this time, the heat pump system conveys the heat extracted from the outside air to the drying equipment to realize the drying function, and at this time, the heat provided by the heat pump system for the drying equipment comes from the outside air energy.
The remote monitoring center is respectively and electrically connected with the heat pump system, the drying equipment, the refrigeration house and the cold air recovery equipment, so as to realize remote control of the air energy grain drying, refrigeration and energy saving integrated device.
Regarding the aforementioned treatment of the surplus cold air, one of the modes is to directly discharge it into the atmosphere, but it is preferable to recycle the surplus cold air again from the viewpoint of environmental protection and energy reuse. For example, one end of the redundant cold air output pipe far away from the first air door is connected to the air inlets of the refrigerators of other refrigerators, the other refrigerators are cooled, and one drying device is connected with a plurality of refrigerators in a butt joint mode, so that the purpose of utilizing recovered cold air to the greatest extent is achieved.
It will be appreciated that a single store may interface with multiple drying units, and that in some cases, it may be an option to transfer heat generated by the store cooling to the active drying unit, given the possibility that some of the drying units may be inactive when the store is in use.
The corresponding relation between the refrigeration house and the drying equipment is not unique, and the essential principle is based on the premise of energy conservation and is used for separating and recycling cold and hot gases depending on the actual application scene.
The cold air cooled by the heat pump system is high in humidity and is not beneficial to the refrigeration of food in the refrigeration house, therefore, the invention provides that a dehumidifier is arranged between the first air door and the air inlet of the refrigeration house, and the cold air cooled by the heat pump system is subjected to dehumidification pretreatment and then is conveyed to the refrigeration house.
It should be understood that the location of the dehumidifier is not limited to the aforementioned one, and may be disposed between the cool air output and the first damper, for example. From the purpose of dehumidification, the arrangement between the first air door and the air inlet of the refrigeration house has the following advantages: when the cold air is not needed in the refrigerator, the cold air at the cold air output port is directly discharged to the atmosphere through the redundant cold air output pipe or is utilized for other purposes, and at the moment, the dehumidification treatment and the direct discharge of the part of cold air are possibly not needed, namely, in the case, a dehumidifier is not needed to be started, and the loss is reduced.
Preferably, an air inlet temperature and humidity sensor group is arranged between the first air door and the dehumidifier. The air inlet temperature and humidity sensor group monitors the temperature and humidity of the cool air which is conveyed to the refrigeration house by the evaporator of the heat pump system in real time, and the target humidity of the dehumidifier is taken as a control object.
Similarly, the position of the air inlet temperature and humidity sensor group is not limited to this, and may be disposed between the cool air outlet and the first air door, for example, and the mounting position may be adjusted according to the actual requirement and the structural layout.
The refrigerator air return opening is provided with an air return opening temperature and humidity sensor group, the air return opening temperature and humidity sensor group monitors the temperature and humidity value of gas at the air return opening of the refrigerator in real time, and the target temperature of the refrigerator is controlled by the sensor group.
In other examples, and with reference to FIG. 2, the cold air recovery device further includes an intelligent regulation controller.
The intelligent regulation controller comprises a temperature and humidity automatic regulation module, an air door control output channel, a communication circuit and an MCU control circuit which is electrically connected with the temperature and humidity automatic regulation module, the air door control output channel and the communication circuit respectively.
The damper control output passage includes a first passage and a second passage connected to the first damper and the second damper, respectively.
The MCU control circuit is also electrically connected with the dehumidifier, the air inlet temperature and humidity sensor group, the return air inlet temperature and humidity sensor group and the heat pump system.
When the working mode of the heat pump system selects heating, the working mode is fed back to the intelligent controller through the communication circuit, and the intelligent controller starts working.
Specifically, the MCU control circuit is arranged to receive detection results fed back by the air inlet temperature and humidity sensor group and the air return inlet temperature and humidity sensor group in real time, and combines the temperature and humidity automatic regulation module according to the received detection results so as to adjust working parameters of the dehumidifier and the heat pump system.
The temperature and humidity automatic regulating module follows the following control rules:
according to the principle of conservation of energy, the energy of the evaporator end is equal to the energy of the condenser end. In the invention, the refrigeration house is a closed loop system, and the drying equipment is an open loop system, so that the energy required for drying is far greater than that of the refrigeration house.
a. Starting a working phase: the first air door and the second air door are respectively in an AC state and an A1C1 state, circulation refrigeration is started in the refrigeration house, and at the moment, heat provided by the heat pump system for the drying equipment is from the refrigeration house.
b. When the temperature of the refrigeration house reaches the set refrigeration temperature: at the moment, no cold air is needed, and the cold air is stopped from being delivered to the refrigerator, and at the moment, the first air door and the second air door are in AB and A1B1 states; meanwhile, the drying equipment still needs heat, at the moment, the evaporator of the heat pump system is in the drying external circulation, and air in the atmosphere environment can be extracted to supply heat for the drying equipment.
c. When the temperature of the refrigeration house is lower than the early warning temperature, the working efficiency of the heat pump system is reduced, and the cold air is stopped being conveyed to the refrigeration house, and at the moment, the first air door and the second air door are in the AB state and the A1B1 state; the intelligent regulation controller carries out early warning to a remote monitoring center through a communication circuit. Preferably, the pre-warning temperature is lower than the set refrigeration temperature.
d. When the heat pump system works in a defrosting mode, cold air is stopped from being conveyed to the refrigeration house, and at the moment, the first air door and the second air door are in AB and A1B1 states; the heat pump system controller and/or the intelligent regulation controller perform early warning to a remote monitoring center through a communication circuit.
In the latter two cases, after the remote monitoring center receives the early warning, the staff intervenes the whole device manually.
Referring to fig. 3, the invention further relates to an intelligent control method of the air energy grain drying, refrigerating and energy saving integrated device based on the air energy grain drying, refrigerating and energy saving integrated device, which comprises the following steps:
the working mode of the device is set through the remote monitoring center, the working mode at least comprises working parameters of drying equipment and a refrigeration house, and the remote monitoring center sends a setting result to the heat pump system, the refrigeration house, the drying equipment and the cold air recovery equipment:
1) If the drying equipment is not started, the heat pump system is switched to a refrigerating mode, cold air is conveyed to the refrigeration house, the first air door is switched to a first communication state, the second air door is switched to a third communication state, and the cold air recovery equipment does not work.
2) If the drying equipment is started, the heat pump system is switched to a heating mode, and the cold air recovery equipment starts to work.
Wherein if the drying equipment is started, the heat pump system is switched to a heating mode, and the cold air recovery equipment starts to work,
the intelligent regulation controller is started to collect real-time temperature of a cold storage detected by the return air inlet temperature and humidity sensor group and real-time temperature and real-time humidity of air at a cold air outlet detected by the air inlet temperature and humidity sensor group in real time:
1) If the real-time temperature of the refrigeration house is higher than the set refrigeration temperature, the intelligent regulation controller switches the first air door to a first communication state, the second air door to a third communication state, the refrigeration house is set to be in a circulating refrigeration mode, and heat released in the refrigeration process is extracted by the heat pump system and then is conveyed to the drying equipment.
2) If the real-time temperature of the refrigeration house reaches the set refrigeration temperature, the intelligent regulation controller switches the first air door to the second communication state and the second air door to the fourth communication state, the refrigeration house is set to be in a closed mode, and the heat pump system extracts heat in the outside air through the air input pipe and conveys the heat to the drying equipment.
3) If the real-time humidity of the air at the cold air output port is greater than the set humidity, the intelligent regulation controller drives the dehumidifier to start working.
4) When the real-time temperature of the refrigeration house is lower than the early warning temperature and/or the heat pump system is in a defrosting working condition, the intelligent regulation controller switches the first air door to a second communication state, and the second air door to a fourth communication state, so that the refrigeration house is closed, and early warning information is sent to a remote monitoring center through a communication circuit.
Compared with the prior art, the technical scheme of the invention has the remarkable beneficial effects that:
1) The invention can realize the design of an integrated grain drying and refrigerating device by carrying out local minor modification and upgrading on the air energy drying equipment, achieves the effect of one machine for multiple purposes and realizes the purpose of recycling and reutilizing cold air recovery resources.
2) According to the invention, the intelligent regulation controller is added to the drying equipment based on the air source heat pump system, so that the aim of whole-course automatic control can be realized on the basis of the original engineering, and the device is convenient to upgrade and reform.
3) The cold air generated by the air source heat pump is recovered and applied to the refrigeration and fresh-keeping of grains, so that the air source heat pump is environment-friendly and safe, and the utilization rate of waste gas can be improved.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of claimed subject matter are considered part of the disclosed inventive subject matter.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of an air-energy grain drying, refrigerating and energy-saving integrated device of the invention.
Fig. 2 is a schematic diagram of the refrigeration house control according to the present invention.
FIG. 3 is a flow chart of an intelligent control method of the air energy grain drying, refrigerating and energy saving integrated device.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Referring to fig. 1, the invention provides an air energy grain drying, refrigerating and energy saving integrated device, which comprises a remote monitoring center 50, a heat pump system 10, drying equipment 20, a refrigeration house 30 and cold air recovery equipment.
The refrigerator 30 has a refrigerator air inlet 31 and a refrigerator air return 32.
The drying apparatus 20 has a hot air inlet 21 and an exhaust air outlet 22.
The heat pump system 10 comprises an air inlet 13, a hot air outlet 14 and a cold air outlet 15, wherein the heat pump system 10 extracts heat energy of air input through the air inlet 13 through heat exchange, cold air discharged after heat exchange is conveyed to the cold air outlet 15, and hot air is conveyed to the hot air outlet 14.
The hot air outlet 14 is communicated with a hot air inlet of the drying device 20 through a hot air supply pipe 81.
Specifically, the heat pump system 10 includes a heat pump unit, an evaporator 12, a condenser 11, and a heat pump system controller 16 electrically connected to the evaporator 12, the condenser 11, and the heat pump unit to control the working states of the heat pump unit, the evaporator 12, and the condenser 11.
The evaporator 12 is configured to cool the gas entering through the gas inlet 13 and output the cooled gas to the cool gas outlet 15 according to a control command of the heat pump system controller 16, and the released heat energy is transferred to the condenser 11.
The condenser 11 is configured to heat the gas introduced through the gas inlet 13 and output the heated gas to the hot air outlet 14 according to a control command of the heat pump system controller 16, and the discharged cold air is supplied to the evaporator 12.
The cold air recovery device comprises a first air door 41, a second air door 42, a cold air output pipe 43, a cold storage air supply pipe 44, a cold storage air return pipe 45 and an air input pipe 46.
The cool air output port 15 of the heat pump system 10 is respectively connected with a cool air supply pipe 44 and a cool air output pipe 43 through a first air door 41, the cool air supply pipe 44 is connected between the first air door 41 and the cool air intake 31, and the first air door 41 has a first communication state and a second communication state.
When the first air door 41 is in the first communication state, the cool air output 15 of the heat pump system 10 is communicated with the cold storage air supply pipe 44, and when the second air door 42 is in the second communication state, the cool air output 15 of the heat pump system 10 is communicated with the surplus cool air output pipe 82.
The air inlet 13 of the heat pump system 10 is respectively connected with an air input pipe 46 and a refrigeration house return air pipe 45 through a second air door 42, the refrigeration house return air pipe 45 is connected between the second air door 42 and the refrigeration house return air inlet 32, and the second air door 42 has a third communication state and a fourth communication state:
when the second air door 42 is in the third communication state, the air inlet 13 of the heat pump system 10 is communicated with the refrigerator return air pipe 45; when the second damper 42 is in the fourth communication state, the air intake 13 of the heat pump system 10 communicates with the air input duct 46.
The remote monitoring center 50 is electrically connected with the heat pump system 10, the drying device 20, the refrigeration house 30 and the cool air recovery device, respectively.
Referring to fig. 2, the cold air recovery apparatus further includes an intelligent regulation controller.
The intelligent regulation controller comprises a temperature and humidity automatic regulation module 472, an air door control output channel, a communication circuit and an MCU control circuit 471 which is electrically connected with the temperature and humidity automatic regulation module 472, the air door control output channel and the communication circuit respectively.
The damper control output passage includes a first passage and a second passage connected to a first damper 41 and a second damper 42, respectively.
The MCU control circuit 471 is further electrically connected to the dehumidifier 70, the air inlet temperature and humidity sensor set 61, the air return inlet temperature and humidity sensor set 62, and the heat pump system 10.
When the drying equipment 20 does not need to be started, the remote monitoring center 50 selects the heat pump system 10 to work in the cooling mode, the heat pump system controller 16 receives a command of working in the cooling mode through the communication circuit and sends cool air to the refrigeration house 30, the first air door 41 is switched to the first communication state, the second air door 42 is switched to the third communication state, the refrigeration house 30 is in the circulating cooling state, and the intelligent regulation controller does not work.
Preferably, the initial states of the first damper 41 and the second damper 42 are the first communication state and the third communication state.
When it is necessary to start the drying apparatus 20, the remote monitoring center 50 selects the heat pump system 10 to operate in the "heating" mode, and the intelligent regulation controller starts to operate after the heat pump system controller 16 receives the command of operating in the "heating" mode through the communication circuit.
After the intelligent regulation controller receives the working command, the air inlet temperature and humidity sensor group 61 monitors the cool air temperature and humidity of the outlet of the evaporator 12 end of the heat pump system 10 in real time, and the dehumidifier starts working; meanwhile, the temperature and humidity sensor group 62 of the air return port 32 of the refrigeration house monitors the refrigeration house 30 in real time, and controls the working states of the first air door 41 and the second air door 42 according to the temperature value of the air return port. Specific:
a. when the real-time temperature of the refrigeration house 30 does not meet the set requirement: the first damper 41 and the second damper 42 are respectively in the AC and A1C1 states, and circulation cooling is performed inside the refrigerator 30, and at this time, heat supplied from the heat pump system 10 to the drying apparatus 20 is from the refrigerator 30.
b. When the temperature of the refrigerator 30 reaches the set requirement: at this time, the cold air is not needed, and the cold air supply to the refrigerator 30 is stopped, and at this time, the first damper 41 and the second damper 42 are in the AB, A1B1 state; at the same time, drying apparatus 20 still requires heat, while evaporator 12 of heat pump system 10 is in an external drying cycle, extracting air from the atmosphere to provide heat supplement to drying apparatus 20.
c. When the temperature of the cold storage 30 is lower than the pre-warning temperature, for example, -3 ℃, the working efficiency of the heat pump system 10 is reduced, and the cold air is stopped being fed to the cold storage 30, and at this time, the first air door 41 and the second air door 42 are in the AB, A1B1 states; the intelligent regulation controller gives an early warning to the remote monitoring center 50 through a communication circuit.
d. When the heat pump system 10 is operated in the defrosting mode, the supply of cool air to the refrigerator 30 is stopped, and at this time, the first damper 41 and the second damper 42 are in the AB, A1B1 states; the heat pump system controller 16 and/or intelligent regulation controller provide an early warning to the remote monitoring center 50 via a communication circuit.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure need not be defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a number of ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.

Claims (4)

1. The air energy grain drying, refrigerating and energy saving integrated device is characterized by comprising a remote monitoring center, a heat pump system, drying equipment, a refrigeration house and cold air recovery equipment;
the refrigerator is provided with a refrigerator air inlet and a refrigerator air return opening;
the drying equipment is provided with a hot air inlet and an exhaust outlet;
the heat pump system comprises an air inlet, a hot air output port and a cold air output port, the heat pump system extracts heat energy of air input through the air inlet through heat exchange, cold air discharged after heat exchange is conveyed to the cold air output port, and hot air is conveyed to the hot air output port;
the hot air outlet is communicated with a hot air inlet of the drying equipment through a hot air supply pipe;
the cold air recovery device comprises a first air door, a second air door, a cold air output pipe, a cold storage air supply pipe, a cold storage return pipe and an air input pipe;
the cold air output port of the heat pump system is connected with the cold storage air supply pipe and the cold air output pipe through the first air door respectively, the cold storage air supply pipe is connected between the first air door and the cold storage air inlet, and the first air door is provided with a first communication state and a second communication state:
when the first air door is in a first communication state, the cold air output port of the heat pump system is communicated with the cold air supply pipe of the refrigeration house, and when the first air door is in a second communication state, the cold air output port of the heat pump system is communicated with the redundant cold air output pipe;
the air inlet of the heat pump system is connected with the air input pipe and the air return pipe of the refrigeration house through a second air door respectively, the air return pipe of the refrigeration house is connected between the second air door and the air return opening of the refrigeration house, and the second air door is provided with a third communication state and a fourth communication state:
when the second air door is in a third communication state, an air inlet of the heat pump system is communicated with a refrigeration house return air pipe; when the second air door is in a fourth communication state, an air inlet of the heat pump system is communicated with the air input pipe;
the remote monitoring center is electrically connected with the heat pump system, the drying equipment, the refrigeration house and the cold air recovery equipment respectively;
a dehumidifier is arranged between the first air door and the air inlet of the refrigeration house;
an air inlet temperature and humidity sensor group is arranged between the first air door and the dehumidifier;
a return air inlet temperature and humidity sensor group is arranged at the return air inlet of the refrigeration house;
the cold air recovery device further comprises an intelligent regulation controller;
the intelligent regulation controller comprises a temperature and humidity automatic regulation module, an air door control output channel and a communication circuit, and an MCU control circuit which is electrically connected with the temperature and humidity automatic regulation module, the air door control output channel and the communication circuit respectively;
the air door control output channel comprises a first channel and a second channel which are respectively connected to the first air door and the second air door;
the MCU control circuit is also electrically connected with the dehumidifier, the air inlet temperature and humidity sensor group, the air return inlet temperature and humidity sensor group and the heat pump system;
the MCU control circuit is arranged to receive detection results fed back by the air inlet temperature and humidity sensor group and the air return inlet temperature and humidity sensor group in real time, and adjust working parameters of the dehumidifier and the heat pump system according to the received detection results;
the intelligent control method of the device comprises the following steps:
the working mode of the device is set through the remote monitoring center, the working mode at least comprises working parameters of drying equipment and a refrigeration house, and the remote monitoring center sends a setting result to the heat pump system, the refrigeration house, the drying equipment and the cold air recovery equipment:
if the drying equipment is not started, the heat pump system is switched to a refrigeration mode, cold air is conveyed to the refrigeration house, the first air door is switched to a first communication state, the second air door is switched to a third communication state, and the cold air recovery equipment does not work;
if the drying equipment is started, the heat pump system is switched to a heating mode, and the cold air recovery equipment starts to work;
if the drying equipment is started, the heat pump system is switched to a heating mode, and the cold air recovery equipment starts to work, namely:
the intelligent regulation controller is started to collect real-time temperature of a cold storage detected by the return air inlet temperature and humidity sensor group and real-time temperature and real-time humidity of air at a cold air outlet detected by the air inlet temperature and humidity sensor group in real time:
1) If the real-time temperature of the refrigeration house is higher than the set refrigeration temperature, the intelligent regulation controller switches the first air door to a first communication state, switches the second air door to a third communication state, the refrigeration house is set to be in a circulating refrigeration mode, and heat released in the refrigeration process is extracted by the heat pump system and then is conveyed to the drying equipment;
2) If the real-time temperature of the refrigeration house reaches the set refrigeration temperature, the intelligent regulation controller switches the first air door to a second communication state and the second air door to a fourth communication state, the refrigeration house is set to be in a closed mode, and the heat pump system extracts heat in the outside air through the air input pipe and transmits the heat to the drying equipment;
3) If the real-time humidity of the gas at the cold air output port is greater than the set humidity, the intelligent regulation controller drives the dehumidifier to start working;
4) When the real-time temperature of the refrigeration house is lower than the early warning temperature and/or the heat pump system is in a defrosting working condition, the intelligent regulation controller switches the first air door to a second communication state, and the second air door to a fourth communication state, so that the refrigeration house is closed, and early warning information is sent to a remote monitoring center through a communication circuit.
2. The air energy grain drying, refrigerating and energy saving integrated device according to claim 1, wherein the heat pump system comprises a heat pump unit, an evaporator and a condenser, and a heat pump system controller electrically connected with the evaporator, the condenser and the heat pump unit respectively for controlling the working states of the heat pump unit, the evaporator and the condenser;
the evaporator is arranged to refrigerate the gas entering through the gas inlet and output the cooled gas to the cold gas output port according to the control instruction of the heat pump system controller, and the released heat energy is conveyed to the condenser;
the condenser is arranged to heat the gas entering through the gas inlet and then output the heated gas to the hot air output port according to a control instruction of the heat pump system controller, and the discharged cold air is conveyed to the evaporator.
3. The air energy grain drying, refrigerating and energy saving integrated device according to claim 2, wherein the heat pump unit is a 1-split-N modularized unit.
4. The air energy grain drying, refrigerating and energy saving integrated device according to claim 1, wherein the heating and refrigerating modes of the heat pump system are respectively as follows:
when the heat pump system is in a heating mode, the heat pump system extracts heat energy of gas input through the air inlet through heat exchange, cold air discharged after heat exchange is conveyed to the cold air output port, and hot air is conveyed to the hot air output port;
when the heat pump system is in the refrigeration mode, the heat pump system cools the gas input through the gas inlet and then conveys the cooled gas to the cool air output port.
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