CN107014172B - Three-pressure air-cooled heat pump drying system with heat recovery function - Google Patents
Three-pressure air-cooled heat pump drying system with heat recovery function Download PDFInfo
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- CN107014172B CN107014172B CN201710389899.4A CN201710389899A CN107014172B CN 107014172 B CN107014172 B CN 107014172B CN 201710389899 A CN201710389899 A CN 201710389899A CN 107014172 B CN107014172 B CN 107014172B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a three-pressure air-cooled heat pump drying system with heat recovery. The technical problems to be solved are that the existing drying process has serious environmental pollution, low dehumidification energy consumption, high operation cost, abnormal working condition of a heat pump and unavailable utilization of dehumidification waste heat. The three-pressure air-cooled heat pump subsystem comprises a main path compressor, a main path oil separator, a main path condenser, a recooler, a middle pressure gas-liquid separator, an evaporator, a low pressure gas-liquid separator, an auxiliary path compressor and an auxiliary path oil separator, wherein an exhaust port of the main path compressor is connected with an inlet of the main path condenser and an outlet of the auxiliary path oil separator through the main path oil separator; and the exhaust port of the auxiliary compressor is connected with the inlet of the auxiliary oil separator. By adopting the technical scheme, the invention improves the reliability, stability and economy of the year-round operation of the air-cooled heat pump drying system, and widens the application field.
Description
Technical Field
The invention relates to the technical field of heat pump drying, in particular to a three-pressure air-cooled heat pump drying system with heat recovery.
Background
In the face of the increasingly outstanding problems of energy shortage and environmental pollution, the traditional drying technologies such as fuel oil, gas, coal or burning wood and the like are gradually eliminated, and the current commonly used environment-friendly drying technologies mainly comprise two technologies, namely an electric heating tube direct heating technology, which is simple to operate, but has low efficiency and high running cost, and is opposite to the national energy-saving policy; the other type adopts a heat pump drying technology, particularly an air source heat pump technology, has a simple structure, is convenient to install and use, is energy-saving and environment-friendly, and is put into use by some enterprises. But the prior conventional air source heat pump drying technology has the following defects: when outdoor air temperature is too high in summer, the condensing pressure of the air source heat pump is too high, the compression ratio of the compressor is too large, the exhaust temperature is too high, the heating capacity and the energy efficiency ratio of the air source heat pump are rapidly reduced, and even the compressor can be frequently and protectively shut down; similarly, when the outdoor air temperature is too low in winter, the evaporation temperature of the air source heat pump is too low, the surface of the evaporator is frosted seriously, the compression ratio of the compressor is too large, the exhaust temperature is too high, the heating capacity and the energy efficiency ratio of the air source heat pump are reduced sharply, and even the device can not run normally. In a word, when the outdoor temperature is too high or too low, the popularization and the application of the air source heat pump in the drying field are seriously influenced by the outstanding technical problem of the conventional air source heat pump.
Moreover, hot air generated by the heat pump drying technology at present absorbs a large amount of moisture of materials to become damp, the system cannot be recycled, the hot air is often directly discharged outside a drying room, and meanwhile outdoor fresh air is supplemented for new heating, so that energy waste is caused, and energy consumption of the heat pump drying technology is increased.
Disclosure of Invention
The invention aims to solve the technical problems that the existing drying process has serious environmental pollution, low dehumidification energy consumption, high operation cost, abnormal working condition of a heat pump and unavailable utilization of dehumidification waste heat, and provides a three-pressure air-cooled heat pump drying system with heat recovery.
In order to solve the technical problems, the invention adopts the following technical scheme: a three-pressure air-cooled heat pump drying system with heat recovery comprises a three-pressure air-cooled heat pump subsystem and a drying medium circulation subsystem, wherein the three-pressure air-cooled heat pump subsystem comprises a main path compressor, a main path oil separator, a main path condenser, a recooler, a middle pressure gas-liquid separator, an evaporator, a low pressure gas-liquid separator, an auxiliary path compressor and an auxiliary path oil separator, and an exhaust port of the main path compressor is connected with an inlet of the main path condenser and an outlet of the auxiliary path oil separator through the main path oil separator; the outlet of the main path condenser is connected with the main path inlet of the recooler; the main path outlet of the recooler is connected with the inlet of the medium-pressure gas-liquid separator; two outlets of the medium-pressure gas-liquid separator are respectively connected with an auxiliary inlet of the recooler and an inlet of the evaporator; the outlet of the evaporator is connected with the air suction port of the main path compressor through a low-pressure gas-liquid separator; the bypass outlet of the recooler is connected with the air suction port of the bypass compressor; the exhaust port of the auxiliary compressor is connected with the inlet of the auxiliary oil separator; the drying medium circulation subsystem comprises an auxiliary PTC electric heater, a medium heating chamber and a drying material chamber, the medium heating chamber is connected with the drying material chamber through an air duct, and the main path condenser and the auxiliary PTC electric heater are arranged in the medium heating chamber.
An air return fan, a moisture and heat discharging fan, a heat recovery device and a fresh air fan are arranged in an air duct of the drying medium circulation subsystem, and an air outlet of the medium heating chamber is connected with an air inlet of a material drying room through the air duct; an air outlet of the drying material room is respectively connected with an air inlet of the air return fan and an air inlet of the moisture and hot air discharging machine; the air outlet of the return air fan is respectively connected with the air outlet of the fresh air fan and the air inlet of the medium heating chamber through an air duct; the air outlet of the moisture and heat exhausting fan is connected with the air exhaust side inlet of the heat recovery device; the air exhaust side outlet of the heat recovery device is connected with the outdoor air exhaust outlet through an air duct; the fresh air side outlet of the heat recovery device is connected with the inlet of the fresh air fan through an air duct.
A temperature sensor and a humidity sensor are arranged in the air duct connected with the air outlet of the drying material room; and a fresh air filter screen is arranged at a fresh air side inlet of the heat recovery device.
A first one-way valve is arranged between the main path oil separator and the main path condenser, and a second one-way valve is arranged between the outlet of the auxiliary path oil separator and the main path condenser; the outlet of the first one-way valve is respectively connected with the outlets of the main condenser and the second one-way valve.
A drying filter, an observation mirror and a first expansion valve are sequentially arranged between the main path outlet of the recooler and the inlet of the medium-pressure gas-liquid separator; a second expansion valve is arranged between the lower outlet of the medium-pressure gas-liquid separator and the evaporator; and an evaporation pressure regulating valve is arranged between the auxiliary path outlet of the recooler and the air suction port of the auxiliary path compressor.
The first expansion valve and the second expansion valve are any one of a manual expansion valve, a choke expansion valve, a floating ball type expansion valve, a thermostatic expansion valve and an electronic expansion valve.
The main road compressor and the auxiliary road compressor are any one of a fixed-frequency scroll compressor, a fixed-frequency rolling rotor compressor, a variable-frequency scroll compressor and a variable-frequency rolling rotor compressor.
The main path condenser and the evaporator are any one of a finned tube heat exchanger, a stacked heat exchanger and a parallel flow heat exchanger.
The evaporation pressure regulating valve is any one of a proportional regulating valve, a proportional integral regulating valve, a proportional differential regulating valve and a proportional integral differential regulating valve which are controlled by the pressure before the valve.
The recooler is in any structural form of a plate heat exchanger, a double-pipe heat exchanger and a flash tank; the heat recovery device is any one of a sensible heat recovery type heat exchanger and a total heat exchanger.
According to the technical scheme, the auxiliary adjusting system and the heat recovery device are matched on the basis of a conventional heat pump drying system, the auxiliary adjusting system mainly comprises an auxiliary compressor, an auxiliary oil separator, a recooler, an evaporation pressure regulating valve and the like, and the auxiliary adjusting system has the following main advantages:
the air-cooled heat pump drying system has the advantages that 1, through auxiliary adjustment of the auxiliary path adjusting system, the outstanding problems that the condensing pressure is too high, the compression ratio of a compressor is too large, the exhaust temperature is too high and the compressor is frequently shut down protectively in a high-temperature refrigeration working mode in summer can be solved, the outstanding problems that the evaporation temperature is too low, the surface of an evaporator is seriously frosted, the compression ratio of the compressor is too large, the exhaust temperature is too high and the heating capacity and the energy efficiency ratio are sharply reduced in a low-temperature heating working mode in winter can be solved, the reliability, the stability and the economical efficiency of the year-round operation of the air-cooled heat pump drying system are improved, and the application field of the air-cooled heat pump drying system is widened.
2 through the auxiliary regulation of the auxiliary path regulating system, the heating capacity of the air-cooled heat pump drying system can be rapidly changed along with the requirements of the material drying process, the dehumidification energy consumption ratio of the dried material is obviously improved, and the color, quality and fragrance of the dried material are ensured.
And 3, heat recovery is carried out on the exhaust moisture waste heat through a heat recovery device, and the air-cooled heat pump drying system is high in cost performance, energy-saving and environment-friendly.
The invention overcomes the defects of the prior heat pump drying technology, has wide market application prospect and huge market potential, and is suitable for large-scale popularization and application.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a flow chart of a single-stage compression drying working mode;
FIG. 3 is a flow chart of a single-stage compression + heat recovery drying mode of operation;
FIG. 4 is a flow chart of a three-pressure drying operation mode;
FIG. 5 is a flow chart of a three-pressure + heat recovery drying mode of operation;
fig. 6 is a flow chart of the auxiliary road + PTC + heat recovery drying operation mode.
Description of the figure numbers: 1, a main path compressor, 2, a main path oil separator, 3, a main path condenser, 4, a recooler, 5, a drying filter, 6, an observation mirror, 7, a first expansion valve, 8, a middle pressure gas-liquid separator, 9, a second expansion valve, 10, an evaporator, 11, a low pressure gas-liquid separator, 12, an evaporation pressure regulating valve, 13, an auxiliary path compressor, 14, an auxiliary path oil separator, 15, a first one-way valve, 16, a second one-way valve, 17, an auxiliary PTC electric heater, 18, a return air fan, 19, a moisture and heat exhausting fan, 20, a heat recovery device, 21, a fresh air filter screen, 22, a fresh air fan, 23, a temperature sensor, 24, 25, a medium heating chamber, 26, a drying material room and 27 materials; the air exhaust side inlet a, the air exhaust side outlet b, the fresh air side inlet c and the fresh air side outlet d.
Detailed Description
As shown in fig. 1, the present invention includes a three-pressure air-cooled heat pump subsystem and a drying medium circulation subsystem, the three-pressure air-cooled heat pump subsystem includes a main compressor 1, a main oil separator 2, a main condenser 3, a sub-cooler 4, a middle pressure gas-liquid separator 8, an evaporator 10, a low pressure gas-liquid separator 11, an auxiliary compressor 13 and an auxiliary oil separator 14, an exhaust port of the main compressor 1 is connected with an inlet of the main condenser 3 and an outlet of the auxiliary oil separator 14 through the main oil separator 2; the outlet of the main condenser 3 is connected with the main inlet of the recooler 4; the main path outlet of the recooler 4 is connected with the inlet of the medium-pressure gas-liquid separator 8; two outlets of the medium-pressure gas-liquid separator 8 are respectively connected with an auxiliary inlet of the recooler 4 and an inlet of the evaporator 10; the outlet of the evaporator 10 is connected with the air suction port of the main-path compressor 1 through a low-pressure gas-liquid separator 11; the bypass outlet of the recooler 4 is connected with the air suction port of the bypass compressor 13; the exhaust port of the auxiliary compressor 13 is connected with the inlet of the auxiliary oil separator 14; an exhaust port of the auxiliary compressor 13 is respectively connected with an inlet of the main condenser 3 and an outlet of the first check valve 15 through an auxiliary oil separator 14 and a second check valve 16 in sequence; the drying medium circulation subsystem comprises an auxiliary PTC electric heater 17, a medium heating chamber 25 and a drying material room 26, the medium heating chamber 25 is connected with the drying material room 26 through an air duct, and the main path condenser 3 and the auxiliary PTC electric heater 17 are arranged in the medium heating chamber 25. The evaporator 10 is an air-cooled evaporator outside the room.
An air return fan 18, a moisture and heat discharging fan 19, a heat recovery device 20 and a fresh air fan 22 are arranged in an air duct of the drying medium circulation subsystem, and an air outlet of the medium heating chamber 25 is connected with an air inlet of the drying material room 26 through the air duct; an air outlet of the dried material room 26 is respectively connected with an air inlet of the return air fan 18 and an air inlet of the moisture and heat discharging fan 19; the air outlet of the return air fan 18 is respectively connected with the air outlet of the fresh air fan 22 and the air inlet of the medium heating chamber 25 through an air duct; the air outlet of the moisture and heat exhausting fan 19 is connected with the air exhaust side inlet a of the heat recovery device 20; the air exhaust side outlet b of the heat recovery device 20 is connected with an outdoor air exhaust outlet through an air duct; the fresh air side outlet d of the heat recovery device 20 is connected with the inlet of the fresh air fan 22 through an air duct. The return air fan 18, the moisture and hot air discharging fan 19 and the fresh air fan 22 are any one of a variable frequency fan, a fixed frequency fan and a gear shifting fan.
A temperature sensor 23 and a humidity sensor 24 are arranged in the air duct connected with the air outlet of the dried material room 26; and a fresh air filter screen 21 is arranged at a fresh air side inlet c of the heat recovery device 20.
A first one-way valve 15 is arranged between the main path oil separator 2 and the main path condenser 3, and a second one-way valve 16 is arranged between the outlet of the auxiliary path oil separator 14 and the main path condenser 3; the outlet of the first check valve 15 is connected to the outlets of the main path condenser 3 and the second check valve 16, respectively.
A drying filter 5, an observation mirror 6 and a first expansion valve 7 are sequentially arranged between the main path outlet of the recooler 4 and the inlet of the medium-pressure gas-liquid separator 8; a second expansion valve 9 is arranged between the lower outlet of the medium-pressure gas-liquid separator 8 and the evaporator 10; an evaporation pressure regulating valve 12 is arranged between the auxiliary outlet of the recooler 4 and the air suction port of the auxiliary compressor 13.
The first expansion valve 7 and the second expansion valve 9 are any one of a manual expansion valve, a choke expansion valve, a floating ball type expansion valve, a thermostatic expansion valve and an electronic expansion valve.
The main compressor 1 and the auxiliary compressor 13 are any one of a fixed frequency scroll compressor, a fixed frequency rolling rotor compressor, a variable frequency scroll compressor, and a variable frequency rolling rotor compressor.
The main path condenser 3 and the evaporator 10 are any one of a finned tube heat exchanger, a stacked heat exchanger and a parallel flow heat exchanger.
The evaporation pressure regulating valve 12 is any one of a proportional regulating valve, a proportional integral regulating valve, a proportional differential regulating valve and a proportional integral differential regulating valve which are controlled by the pressure before the valve. The pre-valve pressure is the evaporation pressure.
The recooler 4 is in any structural form of a plate heat exchanger, a double-pipe heat exchanger and a flash tank; the heat recovery device 20 is any one of a sensible heat recovery type heat exchanger and a total heat exchanger.
The specific connection relation of the three-pressure air-cooled heat pump subsystems is as follows: an exhaust port of the main path compressor 1 is respectively connected with an inlet of the main path condenser 3 and an outlet of the second check valve 16 through the main path oil separator 2 and the first check valve 15 in sequence; the outlet of the main path condenser 3 is connected with the main path inlet of the recooler 4; the main path outlet of the recooler 4 is connected with the inlet of a medium-pressure gas-liquid separator 8 through a drying filter 5, an observation mirror 6 and a first expansion valve 7 in sequence; two outlets of the medium-pressure gas-liquid separator 8 are respectively connected with a bypass inlet of the recooler 4 and an inlet of the second expansion valve 9; the outlet of the second expansion valve 9 is connected with the air suction port of the main compressor 1 sequentially through an outdoor side air-cooled evaporator 10 and a low-pressure gas-liquid separator 11; the bypass outlet of the recooler 4 is connected with the air suction port of a bypass compressor 13 through an evaporation pressure regulating valve 12; and an exhaust port of the auxiliary compressor 13 is respectively connected with an inlet of the main condenser 3 and an outlet of the first check valve 15 through an auxiliary oil separator 14 and a second check valve 16 in sequence.
The specific connection relationship of the drying medium circulation subsystem is as follows: the main condenser 3 and the auxiliary PTC electric heater 17 are sequentially installed in the medium heating chamber 25, and the air outlet of the main condenser is connected with the air inlet of the material drying room 26 through an air duct; the air outlet of the air conditioner is respectively connected with the air inlet of the return air fan 18 and the air inlet of the moisture/hot air exhaust machine 19 through an air duct provided with a temperature sensor 23 and a humidity sensor 24; the air outlet of the return air fan 18 is respectively connected with the air outlet of the fresh air fan 22 and the air inlet of the medium heating chamber 25 through an air duct; the air outlet of the moisture/hot air exhaust machine 19 is connected with the air exhaust side inlet of the heat recovery device 20; the air exhaust side outlet of the heat recovery device 20 is connected with the outdoor air exhaust outlet through an air duct; the fresh air filter screen 21 is arranged at a fresh air side inlet of the heat recovery device 20; the fresh air side outlet of the heat recovery device 20 is connected with the inlet of a fresh air fan 22 through an air duct.
Through the optimized matching combination of the three-pressure air-cooled heat pump subsystem and the drying medium circulation subsystem and the PLC intelligent adjustment, the invention can realize five working modes:
(1) Single-stage compression drying working mode
FIG. 2 is a flow chart of a single-stage compression drying mode that can be used when the outdoor air temperature is between about-5 deg.C and 45 deg.C, and when the material drying operation is initially initiated and the system does not require energy and temperature and humidity regulation. At this time, the fans of the main compressor 1 and the outdoor air-cooled evaporator 10 and the return fan 18 are started, and the auxiliary compressor 13, the auxiliary PTC electric heater 17, the moisture and heat discharging fan 19 and the fresh air fan 22 are turned off. The working process of the three-pressure air-cooled heat pump subsystem is as follows: the high-temperature high-pressure gaseous refrigerant discharged from the main-path compressor 1 enters the main-path condenser 3 through the main-path oil separator 2 and the first one-way valve 15 in sequence, releases heat to heat a circulating drying medium introduced through the return air fan 18, is condensed into a supercooled or saturated liquid refrigerant, then enters the first expansion valve 7 through the recooler 4, the drying filter 5 and the observation mirror 6 in sequence, is changed into a medium-temperature medium-pressure gas-liquid two-phase refrigerant after being throttled and adjusted by the first expansion valve 7, enters the medium-pressure gas-liquid separator 8 to be subjected to gas-liquid separation, then the liquid refrigerant at the lower part of the medium-pressure gas-liquid separator 8 is changed into a low-temperature low-pressure gas-liquid two-phase refrigerant after being throttled and adjusted by the second expansion valve 9, enters the outdoor side air-cooled evaporator 10 to absorb air source heat introduced by the fan, is evaporated into low-pressure superheated refrigerant steam, then enters the main-path air inlet of the main-path compressor 1 after being subjected to gas-liquid separation by the main-liquid compressor 1, the high-temperature high-pressure gaseous refrigerant is discharged, and starts to enter the next cycle. The working process of the drying medium circulation subsystem comprises the following steps: the low-temperature Gao Shidu drying medium in the air duct enters the medium heating chamber 25 through the return air fan 18, absorbs heat released by the main path condenser 3, is heated to become a high-temperature low-humidity drying medium, then enters the drying material room 26 through the air duct, heats the material 27, releases heat to cool, absorbs moisture of the material, becomes a low-temperature Gao Shidu drying medium, and then enters the return air fan 8 to start the next cycle after being detected by the temperature sensor 23 and the humidity sensor 24 in the air duct.
(2) Single-stage compression and heat recovery drying working mode
Fig. 3 is a flow chart of a single-stage compression and heat recovery drying operation mode, which can be adopted when the outdoor air temperature is approximately between-5 ℃ and 45 ℃ and the humidity of the drying medium detected by the temperature sensor 23 and the humidity sensor 24 is too high in the material drying operation process. At this time, the fans of the main compressor 1 and the outdoor side air-cooled evaporator 10, the return air fan 18, the moisture and hot air discharging fan 19 and the fresh air fan 22 are all started, and the auxiliary compressor 13 and the auxiliary PTC electric heater 17 are turned off. The working process of the three-pressure air-cooled heat pump subsystem is the same as the single-stage compression drying working mode. The working process of the drying medium circulation subsystem is as follows: the drying medium from the low temperature Gao Shidu discharged from the drying material room 26 is divided into two parts after being detected by the temperature sensor 23 and the humidity sensor 24 in the air duct, one part enters the medium heating chamber 25 through the return air fan 18, the other part enters the air exhaust side of the heat recovery device 20 through the moisture exhaust and heat exhaust fan 19 to release heat for cooling and then is discharged outdoors, the outdoor low-temperature and low-humidity fresh air enters the fresh air side of the heat recovery device 20 through the fresh air filter screen 21 to absorb heat for heating, enters the medium heating chamber 25 through the fresh air fan 22 to be mixed with part of the drying medium introduced by the return air fan 18 to become the low-temperature and low-humidity drying medium, then absorbs the heat released by the main condenser 3 to become the high-temperature and low-humidity drying medium, enters the drying material room 26 through the air duct, releases heat for cooling after heating the material 27, absorbs the moisture of the material to become the low-temperature Gao Shidu drying medium, and then starts the next cycle after being detected by the temperature sensor 23 and the humidity sensor 24 in the air duct.
(3) Three-pressure drying working mode
FIG. 4 is a flow chart of a three-pressure drying operation mode, which can be adopted when the outdoor air temperature is about 46-55 ℃ or-20-6 ℃ and the material drying operation is started and the system does not need energy and temperature and humidity adjustment. At this time, the fans of the main compressor 1, the auxiliary compressor 13 and the outdoor air-cooled evaporator 10 and the return fan 18 are started, and the auxiliary PTC electric heater 17, the moisture and heat exhausting fan 19 and the fresh air fan 22 are turned off. The working process of the three-pressure air-cooled heat pump subsystem is as follows: the high-temperature high-pressure gaseous refrigerant discharged from the main-path compressor 1 is mixed with the high-temperature high-pressure gaseous refrigerant passing through the second one-way valve 16 sequentially through the main-path oil separator 2 and the first one-way valve 15, then enters the main-path condenser 3, releases heat to heat a circulating drying medium introduced through the return air fan 18, is condensed into a supercooled or saturated liquid refrigerant, enters the main path side of the recooler 4, releases heat to heat a medium-pressure medium-temperature saturated gaseous refrigerant passing through the auxiliary path side of the recooler 4, is further supercooled into a liquid refrigerant with a high supercooling degree, then enters the first expansion valve 7 sequentially through the drying filter 5 and the observation mirror 6, is throttled and adjusted by the first expansion valve 7 to become a medium-temperature medium-pressure gas-liquid two-phase refrigerant, enters the medium-pressure gas-liquid separator 8 for gas-liquid separation and then is divided into two paths, wherein one path is the separated medium-pressure medium-temperature main-pressure saturated liquid refrigerant, is discharged from the lower portion of the medium-pressure gas-liquid separator 8, is throttled and adjusted by the second expansion valve 9 to become a low-temperature low-pressure gas-liquid two-phase refrigerant, enters the outdoor side air-cooled evaporator 10 to absorb heat introduced by the fan, is evaporated to become low-pressure superheated refrigerant, and then enters the high-liquid compressor 1, and is discharged from the high-pressure gas-liquid compressor 1, and then enters the high-liquid compressor 1, and then the high-liquid compressor 1. The other path is separated medium-pressure medium-temperature saturated gaseous refrigerant, the medium-pressure medium-temperature saturated gaseous refrigerant is discharged from the upper part of the medium-pressure gas-liquid separator 8, enters the auxiliary path side of the sub-cooler 4 to absorb the heat of the sub-cooled or saturated liquid refrigerant passing through the main path side of the sub-cooler 4, is changed into superheated gaseous refrigerant, enters the air suction port of the auxiliary path compressor 13 through the throttling and pressure regulating of the evaporation pressure regulating valve 12, is compressed and discharged into high-temperature high-pressure gaseous refrigerant through the auxiliary path compressor 13, is mixed with the high-temperature high-pressure gaseous refrigerant passing through the first check valve 15 sequentially through the auxiliary path oil separator 14 and the second check valve 16, enters the main path condenser 3, and starts to enter the next cycle. The working process of the drying medium circulation subsystem is as follows: the low-temperature Gao Shidu drying medium in the air duct enters the medium heating chamber 26 through the return air fan 18, absorbs heat released by the main path condenser 3, is heated to become a high-temperature low-humidity drying medium, then enters the drying material room 26 through the air duct, heats the material 27, releases heat to cool, absorbs moisture of the material, becomes a low-temperature Gao Shidu drying medium, and then enters the return air fan 8 to start the next cycle after being detected by the temperature sensor 23 and the humidity sensor 24 in the air duct.
(4) Three-pressure and heat recovery drying working mode
FIG. 5 is a flow chart of a three-pressure + heat recovery drying operation mode, which can be adopted when the outdoor air temperature is approximately 46-55 ℃ or-20-6 ℃ and the humidity of the drying medium detected by the temperature sensor 23 and the humidity sensor 24 is too high in the material drying operation process. At this time, the main compressor 1, the auxiliary compressor 13, the blower of the outdoor air-cooled evaporator 10, the return air blower 18, the moisture and heat exhausting blower 19, and the fresh air blower 22 are started, and the auxiliary PTC electric heater 17 is turned off. The working process of the three-pressure air-cooled heat pump subsystem is the same as the three-pressure drying working mode. The working process of the drying medium circulation subsystem is the same as the working mode of single-stage compression and heat recovery drying.
(5) Auxiliary road + PTC + heat recovery drying working mode
Fig. 6 is a flow chart of an auxiliary circuit + PTC + heat recovery drying operation mode, which can be adopted when the humidity of outdoor air is high and the frosting of the outdoor air-cooled evaporator 10 is serious and the humidity of the drying medium detected by the temperature sensor 23 and the humidity sensor 24 is too high in the material drying operation process. At this time, the auxiliary compressor 13, the return air fan 18, the auxiliary PTC electric heater 17, the moisture and heat discharging fan 19, and the fresh air fan 22 are started, and the fans of the main compressor 1 and the outdoor side air-cooled evaporator 10 are turned off. The working process of the three-pressure air-cooled heat pump subsystem is as follows: the high-temperature high-pressure gaseous refrigerant discharged from the auxiliary compressor 13 sequentially passes through the auxiliary oil separator 14 and the second one-way valve 16 to enter the main condenser 3, releases heat to heat a circulating drying medium introduced by the return air fan 18 and the fresh air fan 22, is condensed into a subcooled or saturated liquid refrigerant, enters the main side of the recooler 4 to release heat to heat a medium-pressure medium-temperature saturated gaseous refrigerant passing through the auxiliary side of the recooler 4, is further subcooled into a liquid refrigerant with a higher subcooling degree, then sequentially passes through the drying filter 5 and the observation mirror 6 to enter the first expansion valve 7, is throttled and adjusted by the first expansion valve 7 to become a medium-temperature medium-pressure gas-liquid two-phase refrigerant, enters the medium-pressure gas-liquid separator 8 to be subjected to gas-liquid separation, the separated medium-pressure medium-temperature saturated gaseous refrigerant passes through the upper part of the medium-pressure gas-liquid separator 8 to be discharged, enters the auxiliary side of the recooler 4 to absorb heat of the subcooled or saturated liquid refrigerant passing through the main side of the recooler 4 to become an overheated gaseous refrigerant, the evaporating pressure regulating valve 12 to enter the pressure regulating port of the auxiliary compressor 13 to start compression and discharge of the high-pressure gaseous refrigerant, and then enter the next circulation cycle. The working process of the drying medium circulation subsystem is as follows: the low-temperature Gao Shidu drying medium discharged from the drying material room 26 is detected by a temperature sensor 23 and a humidity sensor 24 in an air duct and then divided into two parts, one part enters a medium heating chamber 25 through a return air fan 18, the other part enters a heat recovery device 20 through a moisture exhaust and heat exhaust fan 19 to release heat for cooling and then is discharged to the outside, the outdoor low-temperature and low-humidity fresh air enters a heat recovery device 20 through a fresh air filter screen 21 to absorb heat for heating, enters the medium heating chamber 25 through a fresh air fan 22 to be mixed with part of the drying medium introduced by the return air fan 18 to become the low-temperature and low-humidity drying medium, the low-temperature and low-humidity drying medium absorbs phase-change latent heat released by a gaseous refrigerant of a main condenser 3 and heat of an auxiliary electric heater 17 successively and then is heated step by step to become the high-temperature and low-humidity drying medium, then enters the drying material room 26 through the air duct to heat a material 27 to release heat for cooling, and absorb moisture of the material to become the low-temperature Gao Shidu drying medium, and then the next cycle is detected by the temperature sensor 23 and the humidity sensor 24 in the air duct to start the next cycle.
Claims (10)
1. The utility model provides a take three pressure forced air cooling heat pump drying system of heat recovery which characterized in that: the three-pressure air-cooled heat pump subsystem comprises a main compressor (1), a main oil separator (2), a main condenser (3), a recooler (4), a middle-pressure gas-liquid separator (8), an evaporator (10), a low-pressure gas-liquid separator (11), an auxiliary compressor (13) and an auxiliary oil separator (14), wherein an exhaust port of the main compressor (1) is connected with an inlet of the main condenser (3) and an outlet of the auxiliary oil separator (14) through the main oil separator (2);
the outlet of the main path condenser (3) is connected with the main path inlet of the recooler (4); the main path outlet of the recooler (4) is connected with the inlet of the medium-pressure gas-liquid separator (8);
two outlets of the medium-pressure gas-liquid separator (8) are respectively connected with a bypass inlet of the recooler (4) and an inlet of the evaporator (10); the outlet of the evaporator (10) is connected with the air suction port of the main-path compressor (1) through a low-pressure gas-liquid separator (11);
the bypass outlet of the recooler (4) is connected with the air suction port of the bypass compressor (13); the exhaust port of the auxiliary compressor (13) is connected with the inlet of the auxiliary oil separator (14);
the drying medium circulation subsystem comprises an auxiliary PTC electric heater (17), a medium heating chamber (25) and a drying material room (26), the medium heating chamber (25) is connected with the drying material room (26) through an air duct, and the main path condenser (3) and the auxiliary PTC electric heater (17) are arranged in the medium heating chamber (25).
2. The drying system with heat recovery for the three-pressure air-cooled heat pump of claim 1, wherein:
an air return fan (18), a moisture and hot air exhausting machine (19), a heat recovery device (20) and a fresh air fan (22) are arranged in an air duct of the drying medium circulation subsystem, and an air outlet of the medium heating chamber (25) is connected with an air inlet of a drying material room (26) through the air duct; an air outlet of the dried material room (26) is respectively connected with an air inlet of the air return fan (18) and an air inlet of the moisture and hot air discharging machine (19);
the air outlet of the return air fan (18) is respectively connected with the air outlet of the fresh air fan (22) and the air inlet of the medium heating chamber (25) through an air duct; the air outlet of the moisture and heat exhausting fan (19) is connected with the air exhaust side inlet (a) of the heat recovery device (20);
an air exhaust side outlet (b) of the heat recovery device (20) is connected with an outdoor air exhaust outlet through an air duct; the fresh air side outlet (d) of the heat recovery device (20) is connected with the inlet of a fresh air fan (22) through an air duct.
3. The drying system with heat recovery for the three-pressure air-cooled heat pump of claim 2, wherein: a temperature sensor (23) and a humidity sensor (24) are arranged in an air duct connected with an air outlet of the drying material room (26); and a fresh air side inlet (c) of the heat recovery device (20) is provided with a fresh air filter screen (21).
4. The three-pressure air-cooled heat pump drying system with heat recovery of claim 1, wherein: a first one-way valve (15) is arranged between the main path oil separator (2) and the main path condenser (3), and a second one-way valve (16) is arranged between the outlet of the auxiliary path oil separator (14) and the main path condenser (3); the outlet of the first one-way valve (15) is respectively connected with the inlet of the main path condenser (3) and the outlet of the second one-way valve (16).
5. The drying system with heat recovery for the three-pressure air-cooled heat pump of claim 1, wherein: a drying filter (5), an observation mirror (6) and a first expansion valve (7) are sequentially arranged between the main path outlet of the recooler (4) and the inlet of the medium-pressure gas-liquid separator (8); a second expansion valve (9) is arranged between the lower outlet of the medium-pressure gas-liquid separator (8) and the evaporator (10); an evaporation pressure regulating valve (12) is arranged between the auxiliary path outlet of the recooler (4) and the air suction port of the auxiliary path compressor (13).
6. The three-pressure air-cooled heat pump drying system with heat recovery of claim 5, wherein: the first expansion valve (7) and the second expansion valve (9) are any one of a manual expansion valve, a choke expansion valve, a floating ball type expansion valve, a thermostatic expansion valve and an electronic expansion valve.
7. The three-pressure air-cooled heat pump drying system with heat recovery of claim 1, wherein: the main path compressor (1) and the auxiliary path compressor (13) are any one of a fixed frequency scroll compressor, a fixed frequency rolling rotor compressor, a variable frequency scroll compressor and a variable frequency rolling rotor compressor.
8. The drying system with heat recovery for the three-pressure air-cooled heat pump of claim 1, wherein: the main path condenser (3) and the evaporator (10) are any one of a finned tube heat exchanger, a stacked heat exchanger and a parallel flow heat exchanger.
9. The drying system with heat recovery for the three-pressure air-cooled heat pump of claim 5, wherein: the evaporation pressure regulating valve (12) is any one of a proportional regulating valve, a proportional integral regulating valve, a proportional differential regulating valve and a proportional integral differential regulating valve which are controlled by the pressure before the valve.
10. The drying system with heat recovery for the three-pressure air-cooled heat pump of claim 2, wherein: the recooler (4) is in any structural form of a plate heat exchanger, a double-pipe heat exchanger and a flash tank; the heat recovery device (20) is any one of a sensible heat recovery type heat exchanger and a total heat exchanger.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012152199A1 (en) * | 2011-05-06 | 2012-11-15 | Rong Guohua | Air conditioning unit for heat recovery from heat pump |
| CN104949495A (en) * | 2015-07-03 | 2015-09-30 | 河南天赫伟业能源科技有限公司 | Intelligent high temperature heat pump drying system with damp-heat recovery |
| CN206803623U (en) * | 2017-05-27 | 2017-12-26 | 中原工学院 | A kind of three pressure air-cooled heat pump drying systems with recuperation of heat |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012152199A1 (en) * | 2011-05-06 | 2012-11-15 | Rong Guohua | Air conditioning unit for heat recovery from heat pump |
| CN104949495A (en) * | 2015-07-03 | 2015-09-30 | 河南天赫伟业能源科技有限公司 | Intelligent high temperature heat pump drying system with damp-heat recovery |
| CN206803623U (en) * | 2017-05-27 | 2017-12-26 | 中原工学院 | A kind of three pressure air-cooled heat pump drying systems with recuperation of heat |
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