CN111707058A - Multi-heat-source self-adaptive material drying system and material drying room - Google Patents

Multi-heat-source self-adaptive material drying system and material drying room Download PDF

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CN111707058A
CN111707058A CN202010733317.1A CN202010733317A CN111707058A CN 111707058 A CN111707058 A CN 111707058A CN 202010733317 A CN202010733317 A CN 202010733317A CN 111707058 A CN111707058 A CN 111707058A
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heat
water
air
temperature
channel
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CN111707058B (en
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李明
李相宏
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Shenzhen Power New Energy Technology Co ltd
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Shenzhen Power New Energy Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention provides a multi-heat-source self-adaptive material drying system and a material drying room, which are characterized in that a first solar heat collecting device, a cross-flow heat exchanger, a water mixing tank and a heat recovery exchanger are added, a water outlet of the heat recovery exchanger is divided into two paths, one path of the two paths; the cross-flow heat exchanger recovers the heat in the exhausted high-temperature and high-humidity gas to achieve the purposes of temperature reduction and dehumidification. The solar heat collecting subsystem is additionally arranged and used for collecting solar heat energy, the working mode of the cross heat exchanger is controlled, the automatic regulation of the ambient temperature of the evaporator side according to the ambient temperature is realized, the stability of the system operation is guaranteed, meanwhile, the automatic defrosting can be realized, and the energy efficiency ratio of the system is high.

Description

Multi-heat-source self-adaptive material drying system and material drying room
Technical Field
The invention relates to the field of drying equipment, in particular to a multi-heat-source self-adaptive material drying system and a material drying room.
Background
Traditional heat pump drying system, mainly include the compressor, condenser and evaporimeter, the condenser sets up in the stoving room, the evaporimeter setting is outdoor, the low temperature heat source in the evaporation absorption air takes place for the refrigerant in the evaporimeter, compress into high temperature high-pressure gas through the compressor, high temperature high-pressure gas takes place the condensation in the condenser, outside release heat, release heat to the stoving room promptly, the realization is to the whole heating in stoving room, treat the effect that the stoving article realized the heating, take out the stoving room with the high temperature and high humidity gas again, continuous heating is bled, reach the within range that anticipates the setting up until will treating the stoving article stoving. The heat pump drying system is simple and has the following defects.
1. The heating capacity (heating quantity) and energy efficiency of the traditional heat pump drying system are limited by the influence of air temperature, air speed and air humidity, and when the parameters are unfavorable, the heating capacity and energy efficiency of the system are reduced.
2. In order to obtain better air temperature, air wind speed and air humidity during engineering installation, a general unit is installed outdoors (outdoors), and higher protection and weather resistance grades are provided for electric appliances, metal plates and the like of the system.
3. The solutions provided by conventional systems are typically accomplished by shutting down and starting up the machine when there is a change in the heat requirements of the dryer material on the condenser side. The high on-off frequency affects the reliability and the service life of the system. Meanwhile, the fluctuation of condensation heat is caused, and the quality of the dried materials is reduced.
4. When evaporation side evaporating temperature was less than zero degree, the evaporimeter can frost, and the system just needs the defrosting to the evaporation side if continuing the operation, and the system can switch the refrigerant flow direction this moment, and the condensation side becomes the evaporation side, can reduce drying temperature, influences material stoving quality and drying efficiency.
Disclosure of Invention
The invention aims to solve the technical problem of how to improve the adaptability of a material drying system to various environmental temperatures, improve the operation stability of the system and improve the energy utilization rate.
The invention provides a multi-heat-source adaptive material drying system, which comprises a compressor, an evaporator and a condenser and is characterized in that a first solar heat collecting device, a cross-flow heat exchanger, a water mixing tank and a heat recovery exchanger are additionally arranged, a water outlet of the heat recovery exchanger is connected with the water mixing tank after passing through a first electric regulating valve in two ways, the other way is connected with a water inlet of the first solar heat collecting device after passing through a second electric regulating valve, a water outlet of the first solar heat collecting device is connected with the water mixing tank, and the water mixing tank is controlled to stably output water with a set water temperature range and flow through the evaporator by controlling the proportion of different temperature water flowing into each water inlet of the water mixing tank; the cross-flow heat exchanger is arranged outside an air outlet of the condenser and used for recovering heat in the discharged high-temperature high-humidity gas to achieve cooling and dehumidification; the evaporator, the heat recovery exchanger and the water mixing tank form a circulating water path, and a water pump is arranged on the circulating water path.
The multi-heat-source self-adaptive material drying system is characterized by further comprising a heat storage water tank, and one path of water outlet of the heat recovery exchanger is additionally connected with the heat storage water tank after passing through a third electric regulating valve.
The multi-heat-source self-adaptive material drying system is characterized in that a second solar heat collecting device is additionally arranged, and the second solar heat collecting device continuously heats water in the heat storage water tank.
The multi-heat-source self-adaptive material drying system is characterized in that a material drying room is divided into a heating channel and a return air channel through a partition plate, and a heat recovery exchanger, the return air channel, one air channel of a cross-flow heat exchanger and the heating channel form a circulating air channel; the air inlet of the heat recovery exchanger is arranged outside the air outlet of the warming channel, and the air outlet of the heat recovery exchanger is arranged outside the air inlet of the air return channel and is connected with the air return channel; the other air duct of the cross-flow heat exchanger is communicated with the ambient air; the dry ball A1 and the wet ball A2 are arranged in the warming channel and used for testing the temperature of air on the warming channel, the dry ball A1 and the wet ball A2 calculate to obtain a first dehumidification dew point temperature X1, and when the dehumidification mode is controlled, the temperature of water flow flowing through the heat recovery exchanger is lower than the first dehumidification dew point temperature X1; the dry ball B1 and the wet ball B2 are arranged in a heating channel and used for testing the temperature of air on an air return channel, the dry ball B1 and the wet ball B2 calculate to obtain a second dehumidification dew point temperature X2, when the dehumidification mode is controlled, the rotating speed of an axial flow fan is calculated according to the second dehumidification dew point temperature X2, and cross-flow heat exchange is started for second dehumidification.
The multi-heat-source self-adaptive material drying system is characterized in that the water temperature output by the water mixing tank is controlled by controlling the first electric regulating valve and the second electric regulating valve, the evaporator is maintained to work at the temperature of more than 8 ℃, and the evaporator is prevented from frosting.
A multi-heat-source self-adaptive material drying room comprises a closed material drying room and a heat pump unit, wherein the heat pump unit comprises a compressor, an evaporator and a condenser, the heat pump unit is arranged on the side surface of the material drying room, and an air induction port is arranged at the bottom of the material drying room and is connected with an air outlet of the condenser through an air induction channel; the top of the material drying room is provided with an exhaust port, the exhaust port is provided with a heat recovery exchanger, an exhaust port of the heat recovery exchanger is connected with an air channel inlet of a cross flow heat exchanger through an air channel, the other air channel of the cross flow heat exchanger is connected with an air inlet of the condenser, the bottom of the cross flow heat exchanger is provided with a first exhaust port, and the bottom of the heat recovery exchanger is provided with a second exhaust port; the solar energy drying room is also provided with a first solar energy heat collecting device and a water mixing tank, wherein the first solar energy heat collecting device is arranged at the top of the material drying room; the water outlet of the heat recovery exchanger is divided into two paths, one path is connected with the water mixing tank after passing through the first electric regulating valve, the other path is connected with the water inlet of the first solar heat collecting device after passing through the second electric regulating valve, the water outlet of the first solar heat collecting device is connected with the water mixing tank, and the water mixing tank is controlled to stably output water within a set water temperature range and flow through the evaporator by controlling the proportion of water with different temperatures flowing into the water mixing tank.
The multi-heat-source self-adaptive material drying room is characterized by further comprising a heat storage water tank, wherein the heat storage water tank is used for caching daytime heat and providing an auxiliary heat source for night, the heat storage water tank is arranged above the heat pump unit and is arranged on one side of the cross flow heat exchanger, and one path of water outlet of the heat recovery heat exchanger is additionally connected with the heat storage water tank after passing through a third electric regulating valve.
The multi-heat-source self-adaptive material drying room is characterized in that a second solar heat collecting device is additionally arranged, the first solar heat collecting device and the second solar heat collecting device are respectively arranged on two sides of the top of the material drying room, and the second solar heat collecting device continuously heats water in the heat storage water tank.
The multi-heat-source self-adaptive material drying room is characterized in that a material drying room is divided into a heating channel and a return air channel through a partition plate, and a heat recovery exchanger, the return air channel, one air channel of a cross-flow heat exchanger and the heating channel form a circulating air channel; the air inlet of the heat recovery exchanger is arranged outside the air outlet of the warming channel, and the air outlet of the heat recovery exchanger is arranged outside the air inlet of the air return channel and is connected with the air return channel; the other duct of the cross-flow heat exchanger is in communication with ambient air.
The multi-heat-source self-adaptive material drying room is characterized in that the water temperature output by the water mixing tank is controlled by controlling the first electric regulating valve and the second electric regulating valve, the evaporator is maintained to work at the temperature of more than 8 ℃, and the evaporator is prevented from frosting.
The implementation of the invention has the following beneficial effects: through increasing in material drying system and setting up solar energy collection subsystem for collect solar thermal energy, still increase simultaneously and set up waste heat collection mechanism, through control cross heat exchanger's mode of operation, realize the automatic ambient temperature who adjusts the evaporimeter side according to ambient temperature, guarantee the stability of system operation, can also realize automatic defrosting simultaneously, the energy efficiency ratio of system is high.
Drawings
FIG. 1 is a diagram of a multi-heat source adaptive material drying system;
FIG. 2 is a schematic plan view of a multiple heat source adaptive material drying room;
FIG. 3 is a schematic perspective view of a multiple heat source adaptive material drying room;
fig. 4 is a flow chart of the overall control of the multi-heat source adaptive material drying room.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The heat pump drying system aims at the problems that an existing heat pump drying system is single in energy supply mode, and the system operation process is easily influenced by the environment, so that temperature fluctuation, frosting and the like easily occur in the actual operation process. Aiming at the problem, the invention provides a method for recovering heat energy released in a dehumidification stage, and a solar heat collecting device is additionally arranged to supplement and provide green energy; meanwhile, the different working states of the solar heat collecting device in the daytime and at night are also considered, the heat storage water tank is additionally arranged, redundant energy, especially redundant energy in the daytime, is stored in the heat storage water tank in a hot water mode, and when the external temperature is too low or the solar heat collecting device cannot work normally at night, the system is supplemented with heat.
Fig. 1 is a configuration diagram of a multi-heat-source adaptive material drying system, and the present invention provides a specific embodiment of a multi-heat-source adaptive material drying room, the material drying room mainly includes a closed material drying room 201, a heat pump unit 202, a heat storage water tank 11, a cross flow heat exchanger 4, a heat recovery heat exchanger 1, a water mixing tank 9, a first solar heat collecting device 10 and a second solar heat collecting device 12, the conventional material drying room only includes a material drying room and a heat pump unit, and the heat pump unit includes a compressor 6, an evaporator 8 and a condenser 5. The refrigerant is evaporated in the evaporator to absorb the low-temperature heat energy of the surrounding environment, and the high-temperature and high-pressure refrigerant gas is condensed to release the heat energy to the periphery, so that the peripheral gas is heated. Partial working principle of the heat pump unit: the compressor compresses the refrigerant into high-temperature and high-pressure gas → the refrigerant is condensed into liquid in the condenser (the condensation heat is sent to the dried material through the axial flow fan) → the refrigerant flows through the throttling component (the electronic expansion valve 17) into low-temperature and low-pressure liquid → absorbs heat in the evaporator and evaporates into gaseous refrigerant → flows back to the compressor 6, and the cycle work is continuously performed.
In order to ensure the safe and reliable operation of the heat pump unit, a high-pressure protection switch 22 is arranged on the exhaust side, a low-pressure protection switch 21 is arranged on the air return side, and a liquid receiver 18 is arranged on the condensation side, and a gas-liquid separator 7 is arranged on the evaporation side.
The embodiment provides multiple improvements on the basis, and integrates the multiple improvements to form a multi-heat-source adaptive material drying room which is compact in structure and has the coordination and matching work of all functional modules. The multi-heat source is mainly embodied as follows: 1) absorbing heat energy in the ambient low-temperature environment temperature through a heat pump; 2) recovering heat energy in the high-temperature and high-humidity gas exhausted from the drying room; 3) one or more groups of solar heat collecting devices are additionally provided to realize a heating mode of increasing solar energy. Meanwhile, in consideration of the fact that the ambient temperature at different time periods is different, particularly the fluctuation of the heat energy collected by the solar heat collecting device is large in the daytime and the night, the heat storage water tank is particularly provided, redundant heat is stored in the heat storage water tank in a hot water mode, and the ambient temperature of the evaporator is maintained to work stably in a preset range by controlling the temperature of hot water discharged to the evaporator.
FIG. 2 is a schematic plan view of a multiple heat source adaptive material drying room; fig. 3 is a schematic three-dimensional distribution diagram of a multi-heat source self-adaptive material drying room, which specifically comprises: the multi-heat-source self-adaptive material drying room main body is a material drying room, the material drying room is integrally closed, a necessary air port communicated with the outside is arranged, drying objects are arranged in the material drying room, in order to increase the amount of the materials to be dried flowing through the material drying room, a partition plate can be adopted in the material drying room to isolate a continuous air channel, the materials to be dried are placed on a material rack, and the contact area of the materials and the high-temperature drying gas is increased.
The heat pump unit is arranged on the side surface of the material drying room, and an induced draft opening is arranged at the bottom of the material drying room and is connected with an air outlet of the condenser through an induced draft channel; the top of the material drying room is provided with an exhaust port, the exhaust port is provided with a heat recovery exchanger, the exhaust port of the heat recovery exchanger is connected with an air channel inlet of a cross flow heat exchanger through an air channel, the other air channel of the cross flow heat exchanger is connected with an air inlet of the condenser, the bottom of the cross flow heat exchanger is provided with a first exhaust port, and the bottom of the heat recovery exchanger is provided with a second exhaust port; the first solar heat collecting device is arranged at the top of the material drying room; the water outlet of the heat recovery exchanger is divided into two paths, one path is connected with the water mixing tank after passing through the first electric regulating valve 15, the other path is connected with the water inlet of the first solar heat collecting device after passing through the second electric regulating valve 14, the water outlet of the first solar heat collecting device is connected with the water mixing tank, and the water mixing tank is controlled to stably output water with a set water temperature range and flow through the evaporator by controlling the proportion of water with different temperatures flowing into the water inlets of the water mixing tank. The heat storage water tank is used for caching daytime heat and providing an auxiliary heat source for night, the heat storage water tank is arranged above the heat pump unit and is arranged on one side of the cross-flow heat exchanger, and one path of water outlet of the heat recovery heat exchanger is additionally connected with the heat storage water tank after passing through a third electric regulating valve 13. The first solar heat collecting device and the second solar heat collecting device are respectively arranged on two sides of the top of the material drying room, and work of a solar panel of the material drying room is facilitated.
The material drying room can be divided into a heating channel 3 and a return air channel 2 by a partition plate, and a heat recovery exchanger, the return air channel, one air channel of a cross-flow heat exchanger and the heating channel form a circulating air channel; the air inlet of the heat recovery exchanger is arranged outside the air outlet of the warming channel, and the air outlet of the heat recovery exchanger is arranged outside the air inlet of the return air channel and is connected with the return air channel; the other duct of the cross-flow heat exchanger is in communication with ambient air. The bottom of the cross flow heat exchanger is provided with a first drain opening 301 and the bottom of the heat recovery exchanger is provided with a second drain opening 302.
The material drying room can control the air flowing speed of the material drying room by controlling the switch of the fan arranged on each air channel, and the hot water flowing direction and speed are realized by controlling the first electric regulating valve and the second electric regulating valve. The working state and control of the whole drying room can be flexibly configured according to the current working environment and the drying requirement on the materials, and the drying room can be manually controlled and can also be self-adaptively controlled. In general there may be some basic control modes as follows:
in the heating mode, the circulating water pump 16 on the circulating water path can be selectively controlled to be closed, or the temperature of water output by the water mixing tank is increased, the axial flow fan of the cross flow heat exchanger is closed, and the gas in the drying room is continuously circulated, is continuously heated by the heat released by the condenser and reaches the preset range.
In the dehumidification mode, a circulating water pump on a circulating water path is opened to reduce the temperature of water output by the mixing water tank, and after the heating mode works, the dried gas is heated into high-temperature gas, and the high-temperature gas continuously circulates and simultaneously heats the to-be-dried object to become high-temperature high-humidity gas, and the high-temperature high-humidity gas exchanges heat with cold water circulating through the water mixing tank on a heat recovery exchanger to heat circulating water, so that the high-temperature high-humidity gas is cooled and part of water vapor is condensed, and primary dehumidification of circulating air is realized; the gas after the first cooling and dehumidification further flows through the cross-flow heat exchanger, an axial flow fan of the cross-flow heat exchanger is turned on, the internal circulating gas and the low-temperature air realize second heat exchange in the cross-flow heat exchanger, the second cooling and dehumidification are realized, and the second dehumidification of the circulating gas is realized. Finally, the circulating gas is changed into low-temperature drying gas again, and the low-temperature drying gas flows through the condenser again to be reheated. The warm-up mode may be re-entered if desired.
The improvement of the invention is that a new supplementary heat source is added, the arranged solar heat collecting device is added, the environment temperature is balanced, and when the current environment temperature is too low to provide enough environment temperature for the evaporator to work, the heat pump drying system can not work normally. Therefore, the solar heat collecting device is introduced, and the effect of heating hot water can be controlled and realized by increasing the solar heat collecting device. In order to achieve the purpose of controlling the working surrounding environment of the evaporator, a circulating water path is additionally arranged, and the water temperature on the heating circulating water path is achieved by a waste heat recovery mode through a heat recovery exchanger. The water channel of the introduced first solar heating device is connected through the water mixing tank, and the water temperature of the water mixing tank is adjusted by controlling the second electric adjusting valve. The added heat storage water tank aims to buffer different environmental temperatures and different sun intensities in different time periods, the purpose of the heat storage water tank is consistent with the effect of a storage battery, and redundant heat energy is stored in a hot water mode. When the temperature of mixing the water tank at present reaches the temperature of expectation setting, then the control water route, lead unnecessary high temperature water to hot water storage tank, improve the temperature of hot water storage tank internal water, reach the purpose of storage heat energy, hot water storage tank also with mix the water tank item and be connected, can't provide sufficient hot water when current solar energy heat collection device, the temperature that mixes the water tank output can not reach the temperature that sets up, then can control the high temperature water tank in the output hot water storage tank, control makes the temperature that mixes the water tank output reach the scope of expectation control.
In order to further ensure that sufficient hot water is stored in the heat storage water tank, a second solar heat collecting device special for heating the heat storage water tank is additionally arranged, and continuous heat energy storage for the heat storage water tank is continuously realized when the sun exists. The water temperature output by the water mixing tank is controlled by controlling the first electric regulating valve and the second electric regulating valve, so that the evaporator is maintained to work at the temperature above 8 ℃, and the frosting problem of the evaporator is prevented.
According to different material properties, the circulation speed of air can be controlled by controlling different axial flow fans, and the temperature output by the water mixing tank can be controlled to adjust the temperature. Of course, different material drying requirements can be matched by setting different working modes, the time of each working mode and the like.
The water temperature regulation of the mixed water in the water mixing tank is combined and regulated by the opening degrees (opening steps) of an electric regulating valve 1, an electric regulating valve 2 and an electric regulating valve 3 according to the following table 1 rules:
table 1:
Figure BDA0002604111650000071
the functions of loading, maintaining, unloading and sudden stop of the condensation heat emission are as follows: according to the material drying process, the drying time can be divided into time period 1, time period 2, time period 3 and time period n according to the total drying time, so that the improvement of the stage quality of each dried material is adapted. The change of the water side temperature realizes the discharge regulation of drying condensation heat and the emergency stop function-closing the compressor according to the following table 2.
Table 2:
Figure BDA0002604111650000081
the system can select one of the two requirements of heating quantity maximization and energy efficiency ratio (energy saving) maximization under the loading, maintaining and unloading functions of condensation heat emission: temperature sensors are arranged at the water inlet and the water outlet, the current energy efficiency mode operation is maintained by the temperature difference of 5 +/-1 degrees of the water inlet and the water outlet, the current maximum heating quantity mode operation is maintained by the temperature difference of not less than 6 degrees of the water inlet and the water outlet, and the control can be carried out by referring to the following 3 rules.
Table 3:
Figure BDA0002604111650000082
a dehumidification mode: including 2 dehumidifications, dehumidification for the first time, heat recovery refrigerated water temperature of intaking is less than dehumidification dew point temperature X1 for the first time, dehumidifies for the second time and is less than dehumidification dew point temperature X2 for the first time at cross flow heat exchanger external air-out temperature, by the external air-out temperature of axial fan amount of wind size control. (n represents any of values 1 to 30).
FIG. 4 is a flow chart of the overall control of a multi-heat source adaptive material drying room, the temperature of the closed circulating air is monitored, namely the temperatures of a dry bulb A1 and a wet bulb A2 in the drying room are obtained through monitoring, the two data are detected in real time, the first dehumidification dew point temperature X1 is obtained, and the temperature of the frozen outlet water at the evaporation side of a heat pump unit is adjusted to be X1-n, wherein n can be set by a user. The temperature of the chilled water entering the heat recovery exchanger is lower than the dew point temperature of air, the chilled water is obtained by the combination and adjustment of a heat pump evaporation side, an electric valve 1, an electric valve 2 and a water mixing tank, the temperature of an air outlet of the dehumidification cross-flow heat exchanger is lower than the dew point temperature (n), and the temperature of the air outlet is controlled by the air volume of the axial flow fan. The system is controlled to be in dehumidification modes of different grades by controlling the opening rates of the first electric control valve, the second electric control valve and the third electric control valve, the strong dehumidification mode is set as n3, the medium dehumidification mode is set as n2, the light dehumidification mode is set as n1, and n1, n2 and n3 are set by a user according to different requirements. The heat recovery heat exchanger is turned on according to different modes to realize the first dehumidification. And further acquiring the temperature of a dry bulb B1 and a wet bulb B2 in the drying room, calculating a second dehumidification dew point temperature X2 according to the acquired temperature, calculating the rotation speed of an axial flow fan according to the second dehumidification dew point temperature X2, starting cross-flow heat exchange for second dehumidification, and circularly working in the way.
While the invention has been described with reference to a particular embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A multi-heat source self-adaptive material drying system comprises a heat pump unit, wherein the heat pump unit comprises a compressor, an evaporator and a condenser and is characterized in that a first solar heat collection device, a cross flow heat exchanger, a water mixing tank and a heat recovery exchanger are additionally arranged, a water outlet of the heat recovery exchanger is connected with the water mixing tank after passing through a first electric regulating valve in two ways, the other way is connected with a water inlet of the first solar heat collection device after passing through a second electric regulating valve, a water outlet of the first solar heat collection device is connected with the water mixing tank, and the water mixing tank is controlled to stably output water with a set water temperature range and flow through the evaporator by controlling the proportion of different temperature water flowing into each water inlet of the water mixing tank; the cross-flow heat exchanger is arranged outside an air outlet of the condenser and used for recovering heat in the discharged high-temperature high-humidity gas to achieve cooling and dehumidification; the evaporator, the heat recovery exchanger and the water mixing tank form a circulating water path, and a water pump is arranged on the circulating water path.
2. The system of claim 1, further comprising a hot water storage tank, wherein a path of water outlet of the heat recovery exchanger is connected to the hot water storage tank through a third electrically controlled valve.
3. The multiple heat source adaptive material drying system according to claim 2, wherein a second solar heat collection device is further added, and the second solar heat collection device continuously heats water in the heat storage water tank.
4. The multiple heat sources self-adaptive material drying system according to claim 3, wherein the material drying room is divided into a heating channel and a return air channel by a partition plate, and the heat recovery exchanger, the return air channel, one air channel of the cross-flow heat exchanger and the heating channel form a circulating air channel; the air inlet of the heat recovery exchanger is arranged outside the air outlet of the warming channel, and the air outlet of the heat recovery exchanger is arranged outside the air inlet of the air return channel and is connected with the air return channel; the other air duct of the cross-flow heat exchanger is communicated with the ambient air; the dry ball A1 and the wet ball A2 are arranged in the warming channel and used for testing the temperature of air on the warming channel, the dry ball A1 and the wet ball A2 calculate to obtain a first dehumidification dew point temperature X1, and when the dehumidification mode is controlled, the temperature of water flow flowing through the heat recovery exchanger is lower than the first dehumidification dew point temperature X1; the dry ball B1 and the wet ball B2 are arranged in a heating channel and used for testing the temperature of air on an air return channel, the dry ball B1 and the wet ball B2 calculate to obtain a second dehumidification dew point temperature X2, when the dehumidification mode is controlled, the rotating speed of an axial flow fan is calculated according to the second dehumidification dew point temperature X2, and cross-flow heat exchange is started for second dehumidification.
5. The multi-heat-source adaptive material drying system according to claim 4, wherein the temperature of water output by the water mixing tank is controlled by controlling the first electric regulating valve and the second electric regulating valve, so that the evaporator is maintained to work at a temperature above 8 ℃, and frost formation of the evaporator is prevented.
6. A multi-heat-source self-adaptive material drying room comprises a closed material drying room and a heat pump unit, wherein the heat pump unit comprises a compressor, an evaporator and a condenser, the heat pump unit is arranged on the side surface of the material drying room, and an air induction port is arranged at the bottom of the material drying room and is connected with an air outlet of the condenser through an air induction channel; the top of the material drying room is provided with an exhaust port, the exhaust port is provided with a heat recovery exchanger, an exhaust port of the heat recovery exchanger is connected with an air channel inlet of a cross flow heat exchanger through an air channel, the other air channel of the cross flow heat exchanger is connected with an air inlet of the condenser, the bottom of the cross flow heat exchanger is provided with a first exhaust port, and the bottom of the heat recovery exchanger is provided with a second exhaust port; the solar energy drying room is also provided with a first solar energy heat collecting device and a water mixing tank, wherein the first solar energy heat collecting device is arranged at the top of the material drying room; the water outlet of the heat recovery exchanger is divided into two paths, one path is connected with the water mixing tank after passing through the first electric regulating valve, the other path is connected with the water inlet of the first solar heat collecting device after passing through the second electric regulating valve, the water outlet of the first solar heat collecting device is connected with the water mixing tank, and the water mixing tank is controlled to stably output water within a set water temperature range and flow through the evaporator by controlling the proportion of water with different temperatures flowing into the water mixing tank.
7. The room for drying materials with multiple heat sources self-adaptive according to claim 6, further comprising a heat storage water tank for storing daytime heat and providing an auxiliary heat source for night, wherein the heat storage water tank is disposed above the heat pump unit and on one side of the cross flow heat exchanger, and one path of water outlet of the heat recovery heat exchanger is connected with the heat storage water tank after passing through a third electric control valve.
8. The multi-heat-source adaptive material drying room according to claim 7, wherein a second solar heat collecting device is additionally arranged, the first solar heat collecting device and the second solar heat collecting device are respectively arranged on two sides of the top of the material drying room, and the second solar heat collecting device continuously heats water in the heat storage water tank.
9. The room for drying materials with multiple heat sources adapted as claimed in claim 8, wherein the room for drying materials is divided into a warming channel and a return channel by a partition, and the heat recovery exchanger, the return channel, one of the cross flow heat exchanger and the warming channel form a circulating air channel; the air inlet of the heat recovery exchanger is arranged outside the air outlet of the warming channel, and the air outlet of the heat recovery exchanger is arranged outside the air inlet of the air return channel and is connected with the air return channel; the other air duct of the cross-flow heat exchanger is communicated with the ambient air; the dry ball A1 and the wet ball A2 are arranged in the warming channel and used for testing the temperature of air on the warming channel, the dry ball A1 and the wet ball A2 calculate to obtain a first dehumidification dew point temperature X1, and when the dehumidification mode is controlled, the temperature of water flow flowing through the heat recovery exchanger is lower than the first dehumidification dew point temperature X1; the dry ball B1 and the wet ball B2 are arranged in a heating channel and used for testing the temperature of air on an air return channel, the dry ball B1 and the wet ball B2 calculate to obtain a second dehumidification dew point temperature X2, when the dehumidification mode is controlled, the rotating speed of an axial flow fan is calculated according to the second dehumidification dew point temperature X2, and cross-flow heat exchange is started for second dehumidification.
10. The multi-heat-source adaptive material drying room according to claim 9, wherein the temperature of water output by the water mixing tank is controlled by controlling the first electric control valve and the second electric control valve, so that the evaporator is maintained to operate at a temperature of more than 8 ℃, and frost formation of the evaporator is prevented.
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