CN106989573B - Closed-circuit type heat pump drying system with internal radiation heat transfer function - Google Patents
Closed-circuit type heat pump drying system with internal radiation heat transfer function Download PDFInfo
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- CN106989573B CN106989573B CN201710392199.0A CN201710392199A CN106989573B CN 106989573 B CN106989573 B CN 106989573B CN 201710392199 A CN201710392199 A CN 201710392199A CN 106989573 B CN106989573 B CN 106989573B
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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
- 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 relates to the technical field of heat pump drying, in particular to a closed-circuit heat pump drying system with internal radiation heat transfer. 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 drying filter, an observation mirror, a middle-pressure gas-liquid separator, an evaporator, a low-pressure gas-liquid separator, an auxiliary path compressor, an auxiliary path oil separator, an auxiliary path condenser and a connecting pipeline; the closed-circuit drying medium circulation subsystem comprises an auxiliary PTC electric heater, a circulating fan, a drying material chamber, a temperature sensor, a humidity sensor, a dehumidification chamber, a condensed water discharge port, a medium heating chamber and a connecting air channel; the invention overcomes the defects of the prior heat pump drying technology, has the characteristics of high drying efficiency, energy conservation, good quality of dried materials, sanitation and the like, has wide market application prospect and huge market potential, and is suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of heat pump drying, in particular to a closed-circuit heat pump drying system with internal radiation heat transfer.
Background
In the face of the increasing prominence of the problems of energy shortage and environmental pollution, the traditional drying technologies such as fuel oil, gas, coal or wood burning and the like are gradually eliminated, and the current commonly used environment-friendly drying technologies mainly comprise two technologies, namely the technology of directly heating by adopting an electric heating tube, the operation is simple, but the efficiency is too low, the operation cost is higher, and the method 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 high, 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 conventional air source heat pump has outstanding technical problems, and the popularization and the application of the air source heat pump in the drying field are seriously influenced.
The current heat pump drying technology mainly adopts heating circulating air, absorbs moisture of materials in a heat convection mode to achieve the purpose of drying the materials, and adopts a single heat convection heat pump drying mode in comparison with a heat transfer mode (heat conduction, heat convection and heat radiation), so that the drying speed of the dried materials is low, the dehumidification energy consumption ratio is relatively low, and the quality of the dried materials is relatively poor. In addition, when dangerous materials, peculiar smell materials, materials with high water content and heat-sensitive materials are dried, the open-circuit type circulating drying medium mode cannot meet the requirements of a drying process.
Disclosure of Invention
The invention aims to provide a closed-circuit heat pump drying system with internal radiation heat transfer to solve the outstanding technical problems of serious environmental pollution, low dehumidification energy consumption, high operation cost, slow drying speed, difficult temperature change regulation and the like in the conventional drying process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a closed-circuit heat pump drying system with internal radiation heat transfer, which comprises a three-pressure air-cooled heat pump subsystem and a closed-circuit drying medium circulation subsystem, wherein the three-pressure air-cooled heat pump subsystem comprises a main circuit compressor, a main circuit oil separator, a main circuit condenser, a recooler, a drying filter, an observation mirror, a first expansion valve, a middle-pressure gas-liquid separator, a second expansion valve, an evaporator, a low-pressure gas-liquid separator, an evaporation pressure regulating valve, an auxiliary circuit compressor, an auxiliary circuit oil separator, a first one-way valve, a second one-way valve, an auxiliary circuit condenser and a connecting pipeline; the closed-circuit drying medium circulation subsystem comprises an auxiliary PTC electric heater, a circulating fan, a drying material chamber, materials, a temperature sensor, a humidity sensor, a dehumidification chamber, a condensed water outlet, a medium heating chamber and a connecting air channel; the exhaust port of the main path compressor is connected with the main path oil separator, and the main path oil separator is connected with the inlet of the main path condenser through a first one-way valve; the outlet of the main path condenser is respectively connected with the main path inlet of the recooler and the outlet of the auxiliary path condenser; the main path outlet of the recooler is connected with the inlet of the medium-pressure gas-liquid separator, and a connecting pipeline between the main path outlet and the inlet of the medium-pressure gas-liquid separator is sequentially provided with a dry filter, an observation mirror and a first expansion valve; two outlets of the medium-pressure gas-liquid separator are respectively connected with an auxiliary inlet of the recooler and an inlet of a second expansion valve, an outlet of the second expansion valve is connected with an evaporator, the evaporator is connected with a low-pressure gas-liquid separator, the low-pressure gas-liquid separator is connected with an air suction port of the main compressor, and an auxiliary outlet of the recooler is connected with an air suction port of the auxiliary compressor after passing through an evaporation pressure regulating valve; an exhaust port of the auxiliary compressor is connected with an auxiliary oil separator, and the auxiliary oil separator is connected with an inlet of an auxiliary condenser through a second one-way valve; a main circuit condenser and an auxiliary PTC electric heater are sequentially installed in the medium heating chamber, and an air outlet of the medium heating chamber is connected with an air inlet of the circulating fan through a connecting air duct; an air outlet of the circulating fan is connected with an air inlet of the drying material room; an auxiliary condenser is arranged in the drying material room, an air outlet of the auxiliary condenser is connected with an air inlet of the dehumidification chamber through a connecting air channel, and a temperature sensor and a humidity sensor are arranged in the connecting air channel between the auxiliary condenser and the dehumidification chamber; an evaporator and a condensed water discharge port are arranged in the dehumidification chamber, and an air outlet of the dehumidification chamber is connected with an air inlet of the medium heating chamber through a connecting air channel; the drying material is uniformly spread on the surface of the auxiliary condenser.
The main path compressor and the auxiliary path 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 in any structural form of a finned tube heat exchanger, a stacked heat exchanger and a parallel flow heat exchanger. The first expansion valve and the second expansion valve are in the form of any one of a manual expansion valve, a choke type expansion valve, a floating ball type expansion valve, a thermostatic expansion valve and an electronic expansion valve. The auxiliary condenser is in any structural form of a multilayer shelf type heat exchanger, a multilayer calandria type heat exchanger and a multilayer aluminum composite plate blown heat exchanger. The circulating fan is any one of a variable frequency fan, a fixed frequency fan and a gear shifting fan. The evaporation pressure regulating valve is in the form of 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 (namely evaporation pressure). The recooler is in any structural form of a plate heat exchanger, a double-pipe heat exchanger and a flash tank.
The invention has the following beneficial effects:
the invention provides a closed-circuit heat pump drying system with internal radiation heat transfer, which has novel conception and skillful unit design optimization, and has the following main advantages that an auxiliary circuit adjusting system (mainly comprising an auxiliary circuit compressor, an auxiliary circuit oil separator, an auxiliary circuit condenser, a recooler, an evaporation pressure adjusting valve and the like) is matched on the basis of a conventional heat pump drying system:
(1) through the auxiliary adjustment of the auxiliary path adjusting system, the air-cooled heat pump drying system can solve the outstanding problems of overhigh condensation pressure, overlarge compression ratio of a compressor, overhigh exhaust temperature and frequent protective shutdown of the compressor in a high-temperature refrigeration working mode in summer, and can also solve the outstanding problems of overlow evaporation temperature, serious frosting on the surface of an evaporator, overlarge compression ratio of the compressor, overhigh exhaust temperature and sharp reduction of heating capacity and energy efficiency ratio in a low-temperature heating working mode in winter, 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 a material drying process, and meanwhile, a material drying mode combining heat convection and radiation heat transfer can be realized, so that the drying speed and the dehumidification energy consumption ratio of the dried material are remarkably improved, and the layer color, the quality and the fragrance of the dried material are ensured.
(3) Through the closed-circuit type circulating drying medium mode, the air-cooled heat pump drying system realizes efficient drying of dangerous materials, peculiar smell materials, materials with high water content and heat-sensitive materials.
(4) The closed-circuit heat pump drying system with internal radiation heat transfer provided by the invention overcomes the defects of the existing heat pump drying technology, and has the characteristics of high drying efficiency, energy conservation, good quality of dried materials, sanitation and the like, so that the closed-circuit heat pump drying system 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 three-pressure drying working mode.
Fig. 4 is a flow chart of the auxiliary road + PTC drying operation mode.
Number in the figure: 1 is a main path compressor, 2 is a main path oil separator, 3 is a main path condenser, 4 is a recooler, 5 is a drying filter, 6 is an observation mirror, 7 is a first expansion valve, 8 is a middle pressure gas-liquid separator, 9 is a second expansion valve, 10 is an evaporator, 11 is a low pressure gas-liquid separator, 12 is an evaporation pressure regulating valve, 13 is an auxiliary path compressor, 14 is an auxiliary path oil separator, 15 is a first one-way valve, 16 is a second one-way valve, 17 is an auxiliary path condenser, 18 is an auxiliary PTC electric heater, 19 is a circulating fan, 20 is a drying material room, 21 is a material, 22 is a temperature sensor, 23 is a humidity sensor, 24 is a dehumidification room, 25 is a condensed water discharge port, and 26 is a medium heating room.
Detailed Description
The invention will be further described with reference to the following examples (figures) without restricting the invention thereto.
Example 1
As shown in fig. 1, the present invention provides a closed-circuit heat pump drying system with internal radiation heat transfer, which mainly comprises a three-pressure air-cooled heat pump subsystem and a closed-circuit drying medium circulation subsystem. The three-pressure air-cooled heat pump subsystem is composed of a main path compressor 1, a main path oil separator 2, a main path condenser 3, a recooler 4, a drying filter 5, an observation mirror 6, a first expansion valve 7, a middle pressure gas-liquid separator 8, a second expansion valve 9, an evaporator 10, a low pressure gas-liquid separator 11, an evaporation pressure regulating valve 12, an auxiliary path compressor 13, an auxiliary path oil separator 14, a first one-way valve 15, a second one-way valve 16, an auxiliary path condenser 17 and a connecting pipeline. The specific connection relation is as follows: the exhaust port of the main path compressor 1 is connected with the inlet of the main path condenser 3 through the main path oil separator 2 and the first one-way valve 15 in sequence; the outlet of the main path condenser 3 is respectively connected with the main path inlet of the recooler 4 and the outlet of the auxiliary path condenser 17; 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 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 the exhaust port of the auxiliary compressor 13 is connected with the inlet of an auxiliary condenser 17 through an auxiliary oil separator 14 and a second one-way valve 16 in sequence. The closed-circuit drying medium circulation subsystem is composed of an auxiliary PTC electric heater 18, a circulating fan 19, a drying material room 20, materials 21, a temperature sensor 22, a humidity sensor 23, a dehumidifying chamber 24, a condensed water outlet 25, a medium heating chamber 26 and a connecting air channel. The specific installation and connection relation is as follows: the main condenser 3 and the auxiliary PTC electric heater 18 are successively installed in the medium heating chamber 26, and the air outlet of the main condenser is connected with the air inlet of the circulating fan 19 through an air duct; an air outlet of the circulating fan 19 is connected with an air inlet of the material drying room 20; a bypass condenser 17 is arranged in the drying material room 20, and an air outlet of the bypass condenser is connected with an air inlet of a dehumidifying chamber 24 through an air duct provided with a temperature sensor 22 and a humidity sensor 23; the dehumidification chamber 24 is internally provided with an evaporator 10 and a condensed water outlet 25, and the air outlet of the dehumidification chamber is connected with the air inlet of a medium heating chamber 26 through an air duct; the drying material 21 is uniformly laid on the surface of the bypass condenser 17.
The main compressor 1 is a fixed-frequency scroll compressor, and the auxiliary compressor 13 is a fixed-frequency rolling rotor compressor. The main condenser 3 is a finned tube heat exchanger, and the evaporator 10 is a stacked heat exchanger. The first expansion valve 7 is a manual expansion valve, and the second expansion valve 9 is a manual expansion valve. The bypass condenser 17 is a multi-layer rack type heat exchanger. The circulating fan 19 is a variable frequency fan. The evaporation pressure regulating valve 12 is a proportional regulating valve controlled by the pressure before the valve (i.e., evaporation pressure). The recooler 4 is a plate heat exchanger.
Example 2
The main compressor 1 is a fixed-frequency rolling rotor compressor, and the auxiliary compressor 13 is a variable-frequency rolling rotor compressor. The main path condenser 3 is a parallel flow type heat exchanger, and the evaporator 10 is a laminated type heat exchanger. The first expansion valve 7 is a manual expansion valve, and the second expansion valve 9 is a choke type expansion valve. The auxiliary condenser 17 is a multi-layer aluminum composite plate roll-bond heat exchanger. The circulating fan 19 is a variable frequency fan. The evaporation pressure regulating valve 12 is a proportional-integral regulating valve controlled by the pressure before the valve (i.e., evaporation pressure). The sub-cooler 4 is a flash tank. The other structure is the same as embodiment 1.
Example 3
The main compressor 1 is a variable frequency scroll compressor, and the auxiliary compressor 13 is a constant frequency rolling rotor compressor. The main path condenser 3 is a stacked heat exchanger, and the evaporator 10 is a finned tube heat exchanger. The first expansion valve 7 is an electronic expansion valve, and the second expansion valve 9 is a thermal expansion valve. The bypass condenser 17 is a multi-layer calandria heat exchanger. The circulating fan 19 is a variable frequency fan. The evaporation pressure regulating valve 12 is a proportional differential regulating valve controlled by the pressure before the valve (i.e., evaporation pressure). The recooler 4 is a plate heat exchanger. The other structure is the same as that of embodiment 1.
Example 4
The main compressor 1 is a variable frequency scroll compressor, and the auxiliary compressor 13 is a constant frequency rolling rotor compressor. The main path condenser 3 is a stacked heat exchanger, and the evaporator 10 is a finned tube heat exchanger. The first expansion valve 7 is a floating ball type expansion valve, and the second expansion valve 9 is a flashlight expansion valve. The bypass condenser 17 is a multi-layer calandria heat exchanger. The circulating fan 19 is a variable frequency fan; the evaporation pressure regulating valve 12 is a proportional-integral-derivative regulating valve controlled by the pressure before the valve (i.e., evaporation pressure). The subcooler 4 is a double-pipe heat exchanger. The other structure is the same as that of embodiment 1.
Example 5
The main compressor 1 is a variable frequency rolling rotor compressor and the auxiliary compressor 13 is a fixed frequency scroll compressor. The main path condenser 3 is a stacked heat exchanger, and the evaporator 10 is a finned tube heat exchanger. The first expansion valve 7 is an electronic expansion valve and the second expansion valve 9 is a floating ball type expansion valve. The bypass condenser 17 is a multi-layer calandria heat exchanger. The circulating fan 19 is a fixed frequency fan. The evaporation pressure regulating valve 12 is a proportional-differential regulating valve controlled by the pre-valve pressure (i.e., evaporation pressure). The recooler 4 is a plate heat exchanger. The other structures are the same as those of embodiment 1.
The principle of the invention is as follows: through the optimized matching combination of the three-pressure air-cooled heat pump subsystem and the closed-circuit drying medium circulation subsystem and the PLC intelligent regulation, the invention can realize three working modes:
(1) single-stage compression drying working mode
FIG. 2 is a flow chart of a single stage compression drying mode of operation that can be used when the outdoor air temperature is between about-5 deg.C and about 45 deg.C. At this time, the main compressor 1 and the circulation fan 19 are started, and the sub compressor 13 and the auxiliary PTC electric heater 18 are turned off. The working process of the three-pressure air-cooled heat pump subsystem is as follows: the high-temperature high-pressure gas refrigerant discharged by the main path compressor 1 enters a main path condenser 3 through a main path oil separator 2 and a first one-way valve 15 in sequence, releases heat to heat a circulating drying medium introduced by a circulating fan 19, is condensed into a supercooled or saturated liquid refrigerant, then enters a first expansion valve 7 through a recooler 4, a drying filter 5 and an 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 a medium-pressure gas-liquid separator 8 for 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 a second expansion valve 9, enters an evaporator 10 to absorb the heat of the circulating drying medium introduced by the circulating fan 19, is evaporated into low-pressure superheated refrigerant steam, then enters an air suction port of the main path compressor 1 after being subjected to gas-liquid separation by a low-pressure gas-liquid separator 11, after being compressed by the main-circuit compressor 1, the high-temperature and high-pressure gaseous refrigerant is discharged and enters the next cycle. The working process of the drying medium circulation subsystem is as follows: the high-temperature low-humidity drying medium from the medium heating chamber 26 enters the drying material chamber 20 through the circulating fan 19, the heat is released to reduce the temperature after the material 21 is heated, meanwhile, the moisture of the material is absorbed and changed into the low-temperature high-humidity drying medium, then the low-temperature low-humidity drying medium enters the dehumidifying chamber 24 after being detected by the temperature sensor 22 and the humidity sensor 23 in the air duct, the heat is released to heat the gas-liquid two-phase refrigerant entering the evaporator 10, the water vapor in the drying medium is changed into condensed water to be separated out and is discharged by the condensed water discharge port 25, then the low-temperature low-humidity drying medium enters the medium heating chamber 26 through the air duct, the phase-change latent heat released by the gaseous refrigerant entering the main path condenser 3 is absorbed and then the temperature is raised to change into the high-temperature low-humidity drying medium, and the next cycle is started.
(2) Three-pressure drying working mode
FIG. 3 is a flow chart of a three-pressure drying mode, which can be used when the outdoor air temperature is between about 46 ℃ and 55 ℃ or between-20 ℃ and-6 ℃. At this time, the main compressor 1, the sub compressor 13, and the circulation fan 19 are started, and the auxiliary PTC electric heater 18 is 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 by the main path compressor 1 enters a main path condenser 3 through a main path oil separator 2 and a first one-way valve 15 in sequence, releases heat to heat a circulating drying medium introduced by a return air fan 18, is condensed into a supercooled or saturated liquid refrigerant, is mixed with the supercooled or saturated liquid refrigerant from an auxiliary path condenser 17, enters a main path side of a recooler 4 to release heat to heat a medium-pressure medium-temperature saturated gaseous refrigerant passing through an auxiliary path side of the recooler 4, is further supercooled into a liquid refrigerant with a large supercooling degree, enters a first expansion valve 7 through a drying filter 5 and an observation mirror 6 in sequence, is throttled and adjusted by the first expansion valve 7 to become a medium-temperature medium-pressure gas-liquid two-phase refrigerant, enters a medium-pressure gas-liquid separator 8 to be subjected to gas-liquid separation and then is divided into two paths, wherein one path is the separated medium-pressure medium-temperature saturated liquid refrigerant, the refrigerant is discharged from the lower part of the middle-pressure gas-liquid separator 8, then is throttled and adjusted by the second expansion valve 9 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, enters the evaporator 10 to absorb the heat of the circulating drying medium introduced by the circulating fan 19, is evaporated to become low-pressure superheated refrigerant steam, then enters the air suction port of the main-path compressor 1 after being subjected to gas-liquid separation by the low-pressure gas-liquid separator 11, is compressed by the main-path compressor 1, discharges a high-temperature and high-pressure gaseous refrigerant, and starts to enter the next cycle. The other path is separated medium-pressure medium-temperature saturated gaseous refrigerant, the separated 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 supercooled 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 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, then enters the auxiliary path condenser 17 through the auxiliary path oil separator 14 and the second one-way valve 16 in sequence, releases the heat to heat and dry the material 21 in the material room 20, is condensed into the supercooled or saturated liquid refrigerant, is mixed with the supercooled or saturated liquid refrigerant from the main path condenser 3, and starts to enter the next cycle. The working process of the drying medium circulation subsystem is the same as the working mode of single-stage compression drying.
(3) Auxiliary road + PTC drying working mode
Fig. 4 is a flow chart of an auxiliary circuit + PTC drying operation mode, which can be adopted when the humidity of the drying medium detected by the temperature sensor 22 and the humidity sensor 23 is low in the middle and later stages of the material drying operation. At this time, the auxiliary compressor 13, the auxiliary PTC electric heater 18, and the circulation fan 19 are started, and the main compressor 1 is 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 by the auxiliary compressor 13 enters an auxiliary condenser 17 through an auxiliary oil separator 14 and a second one-way valve 16 in sequence, releases heat to heat and dry a material 21 among materials 20, is condensed into a supercooled or saturated liquid refrigerant, enters the main side of the sub-cooler 4 to release heat to heat the medium-pressure medium-temperature saturated gaseous refrigerant passing through the auxiliary side of the sub-cooler 4, is further supercooled into a liquid refrigerant with a higher supercooling degree, enters the first expansion valve 7 through the drying filter 5 and the observation mirror 6 in sequence, is throttled and adjusted by the first expansion valve 7 to become 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 is discharged through the upper part of the medium-pressure gas-liquid separator 8, enters the auxiliary side of the sub-cooler 4 to absorb the heat of the supercooled or saturated liquid refrigerant passing through the main side of the sub-pressure gas-liquid separator 4, the refrigerant is changed into superheated gaseous refrigerant, enters an air suction port of an auxiliary compressor 13 through the evaporation pressure regulating valve 12 by throttling and pressure regulating, is compressed by the auxiliary compressor 13 to discharge high-temperature and high-pressure gaseous refrigerant, and starts to enter the next cycle. The working process of the drying medium circulation subsystem is as follows: the high-temperature low-humidity drying medium from the medium heating chamber 26 enters the drying material chamber 20 through the circulating fan 19, releases heat to cool after heating the material 21, absorbs a small amount of moisture of the material at the same time, changes into a low-temperature high-humidity drying medium, then enters the medium heating chamber 26 through the dehumidifying chamber 24 after being detected by the temperature sensor 22 and the humidity sensor 23 in the air duct, and rises the temperature after absorbing the heat released by the auxiliary PTC electric heater 18, changes into a high-temperature low-humidity drying medium, and starts the next cycle.
Claims (7)
1. The utility model provides a closed circuit formula heat pump drying system with interior radiation heat transfer which characterized in that: the system comprises a three-pressure air-cooled heat pump subsystem and a closed-circuit drying medium circulation subsystem, wherein the three-pressure air-cooled heat pump subsystem comprises a main circuit compressor (1), a main circuit oil separator (2), a main circuit condenser (3), a recooler (4), a medium-pressure gas-liquid separator (8), a second expansion valve (9), an evaporator (10), a low-pressure gas-liquid separator (11), an auxiliary circuit compressor (13), an auxiliary circuit oil separator (14), a first one-way valve (15), an auxiliary circuit condenser (17) and a connecting pipeline; the closed-circuit drying medium circulation subsystem comprises an auxiliary PTC electric heater (18), a drying material room (20), materials (21), a dehumidification chamber (24) and a medium heating chamber (26); the exhaust port of the main path compressor (1) is connected with the main path oil separator (2), and the main path oil separator (2) is connected with the inlet of the main path condenser (3) through a first one-way valve (15); the outlet of the main path condenser (3) is respectively connected with the main path inlet of the recooler (4) and the outlet of the auxiliary path condenser (17); 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 a second expansion valve (9), an outlet of the second expansion valve (9) is connected with an evaporator (10), the evaporator (10) is further connected with a low-pressure gas-liquid separator (11), the low-pressure gas-liquid separator (11) is connected with an air suction port of the main-path compressor (1), and an auxiliary outlet of the recooler (4) is connected with an air suction port of an auxiliary compressor (13); an exhaust port of the auxiliary compressor (13) is connected with an auxiliary oil separator (14), and the auxiliary oil separator (14) is connected with an inlet of an auxiliary condenser (17); a main circuit condenser (3) and an auxiliary PTC electric heater (18) are sequentially installed in the medium heating chamber (26), and an air outlet of the medium heating chamber (26) is connected with an air inlet of the drying material room (20); a bypass condenser (17) is arranged in the drying material room (20), and an air outlet of the bypass condenser (17) is connected with an air inlet of the dehumidification chamber (24) through a connecting air channel; an evaporator (10) is arranged in the dehumidification chamber (24), and an air outlet of the dehumidification chamber (24) is connected with an air inlet of the medium heating chamber (26) through a connecting air channel; the material (21) is uniformly laid on the surface of the auxiliary condenser (17);
the three-pressure air-cooled heat pump subsystem further comprises a drying filter (5), an observation mirror (6), a first expansion valve (7), an evaporation pressure regulating valve (12) and a second one-way valve (16), wherein the drying filter (5), the observation mirror (6) and the first expansion valve (7) are sequentially arranged on a connecting pipeline between the recooler (4) and the medium-pressure gas-liquid separator (8), an auxiliary outlet of the recooler (4) is connected with an air suction port of an auxiliary compressor (13) through the evaporation pressure regulating valve (12), and an auxiliary oil separator (14) is connected with an inlet of an auxiliary condenser (17) through the second one-way valve (16);
the closed-circuit drying medium circulation subsystem further comprises a circulating fan (19), a temperature sensor (22), a humidity sensor (23), a condensed water discharge port (25) and a connecting air channel, wherein the circulating fan (19) is arranged in the connecting air channel between the air outlet of the medium heating chamber (26) and the drying material room (20); a temperature sensor (22) and a humidity sensor (23) are arranged in a connecting air duct between the auxiliary condenser (17) and the dehumidifying chamber (24), and a condensed water discharging port (25) is arranged in the dehumidifying chamber (24).
2. The closed heat pump drying system with internal radiation heat transfer of claim 1, wherein: the main path compressor (1) and the auxiliary path compressor (13) are respectively in any one form 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) is in any structural form of a finned tube heat exchanger, a stacked heat exchanger and a parallel flow heat exchanger; the evaporator (10) is in any structural form of a finned tube heat exchanger, a stacked heat exchanger and a parallel flow heat exchanger.
3. The closed heat pump drying system with internal radiation heat transfer of claim 1, wherein: the first expansion valve (7) and the second expansion valve (9) are in the form of any one of a manual expansion valve, a choke expansion valve, a floating ball type expansion valve, a thermal expansion valve and an electronic expansion valve.
4. The closed heat pump drying system with internal radiation heat transfer of claim 1, wherein: the auxiliary condenser (17) is in any structural form of a multilayer shelf type heat exchanger, a multilayer calandria type heat exchanger and a multilayer aluminum composite plate blown heat exchanger.
5. The closed heat pump drying system with internal radiation heat transfer of claim 3, wherein: the circulating fan (19) is any one of a variable frequency fan, a fixed frequency fan and a gear shifting fan.
6. The closed-circuit heat pump drying system with internal radiation heat transfer of claim 2, 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.
7. The closed heat pump drying system with internal radiation heat transfer of claim 1, wherein: the recooler (4) is in any structural form of a plate heat exchanger, a double-pipe heat exchanger and a flash tank.
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| CN201710392199.0A CN106989573B (en) | 2017-05-27 | 2017-05-27 | Closed-circuit type heat pump drying system with internal radiation heat transfer function |
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| CN201710392199.0A CN106989573B (en) | 2017-05-27 | 2017-05-27 | Closed-circuit type heat pump drying system with internal radiation heat transfer function |
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| CN106989573B true CN106989573B (en) | 2022-09-09 |
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| CN107726837A (en) * | 2017-10-31 | 2018-02-23 | 佛山市南海聚腾环保设备有限公司 | A kind of air heat source and thermal pump drying materials system |
| CN112958413A (en) * | 2021-02-22 | 2021-06-15 | 江苏宇通干燥工程有限公司 | Drying oven for closed cycle and engine paint drying and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201053758Y (en) * | 2007-06-04 | 2008-04-30 | 南京工业大学 | Two-stage compression air source heat pump water heater |
| KR101069827B1 (en) * | 2008-09-17 | 2011-10-04 | 제주특별자치도(농업기술원) | Dryer using heat pump |
| CN201811369U (en) * | 2010-09-29 | 2011-04-27 | 石曾矿 | Triple-effect heat pump dehumidification dryer |
| CN103206799B (en) * | 2013-04-28 | 2015-08-26 | 江苏枫叶能源技术有限公司 | A kind of edible mushroom drying device heat pump circuit |
| CN104949496B (en) * | 2015-07-03 | 2017-03-01 | 中原工学院 | A kind of high-temperature heat pump drying system with Intelligent adjustment function |
| CN205561339U (en) * | 2016-03-31 | 2016-09-07 | 郑州欧纳尔冷暖科技有限公司 | From overlapping heat pump system |
| CN106524741B (en) * | 2016-12-16 | 2022-03-01 | 江苏天舒电器股份有限公司 | Heat pump type double-circulation hot air drying system and control method thereof |
| CN207335297U (en) * | 2017-05-27 | 2018-05-08 | 中原工学院 | Closed type heat pump drying system with interior radiant heat transfer |
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