CN112880381B - Closed heat pump drying system of networking of many heat exchangers reorganization - Google Patents
Closed heat pump drying system of networking of many heat exchangers reorganization Download PDFInfo
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- CN112880381B CN112880381B CN202110124612.1A CN202110124612A CN112880381B CN 112880381 B CN112880381 B CN 112880381B CN 202110124612 A CN202110124612 A CN 202110124612A CN 112880381 B CN112880381 B CN 112880381B
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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
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
- F26B23/005—Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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Abstract
The invention relates to a multi-heat exchanger networked recombined closed heat pump drying system, which comprises a drying tunnel and a heat exchanger network, wherein the drying tunnel is connected with the heat exchanger network; the heat exchanger network comprises a plurality of stages of heat exchanger components, and each stage of heat exchanger component is matched with corresponding stages of air circulation and refrigerant circulation; a conveying unit is arranged in the drying tunnel and conveys the articles to be dried along the length direction of the drying tunnel; wherein each stage of air circulation is sequentially arranged in parallel, and each stage of air circulation is communicated with the drying tunnel through the air supply outlet, so that the stepped heating air supply in the length direction of the drying tunnel is realized, and the temperature and humidity change in the length direction of the drying tunnel is matched with the temperature and humidity field of the drying characteristics of the articles to be dried. Compared with the prior art, the temperature and humidity field matching device has the advantages of uniform temperature and humidity field matching, high system energy efficiency, reasonable energy distribution, full utilization, good flexibility and technical universality.
Description
Technical Field
The invention relates to a closed heat pump drying system, in particular to a multi-heat exchanger networked recombined closed heat pump drying system.
Background
The closed heat pump drying is equipment which utilizes an inverse Carnot cycle principle to recover latent heat of condensed water while mechanically dehumidifying humid air and heat circulating air flow to realize cyclic heating and drying of materials. Because only water is discharged by the closed heat pump drying system, most of heat energy in the drying process is recovered, and the efficiency is very high. The efficiency of the device is completely independent of the outside temperature and humidity, the device can always keep high energy efficiency all the year round, and the device is suitable for any climate condition.
A simple heat pump drying system has only two heat exchangers, namely an evaporator for air condensation and dehumidification and a condenser for air heating. In order to further improve the energy utilization efficiency of the closed heat pump drying, researchers have proposed many improvements. For example, CN209042909U proposes a closed drying device with a series-type auxiliary condenser to achieve heat balance of the system and improve system efficiency; CN109945603 has proposed a closed heat pump drying system, through measures such as arranging dehumidifier, evaporimeter, subcooling condenser, condenser in the system, realizes two-stage dehumidification and step heating to the air, promotes drying system's efficiency.
The above cases show that the heat exchanger is reasonably added in the closed drying system, which is beneficial to improving the energy utilization efficiency. However, the above patent only proposes a certain specific closed heat pump system structure, and the used heat exchanger network is still relatively simple, and precooling and preheating in the air circulation process are not considered, so the closed heat pump drying system still has the potential of further improving the energy efficiency of the system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a closed drying system which aims at improving closed drying energy efficiency and adopts networking recombination of multiple heat exchangers, and the closed drying system has uniform matching of temperature and humidity fields and high system energy efficiency.
The purpose of the invention can be realized by the following technical scheme:
the invention relates to a multi-heat exchanger networked recombined closed heat pump drying system, which comprises a drying tunnel and a heat exchanger network;
the heat exchanger network comprises a plurality of stages of heat exchanger components, and each stage of heat exchanger component is matched with corresponding stage of air circulation and refrigerant circulation;
a conveying unit is arranged in the drying tunnel and conveys the articles to be dried along the length direction of the drying tunnel;
wherein each stage of air circulation is sequentially arranged in parallel, and each stage of air circulation is communicated with the drying tunnel through the air supply outlet, so that the stepped heating air supply in the length direction of the drying tunnel is realized, and the temperature and humidity change in the length direction of the drying tunnel is matched with the temperature and humidity field of the drying characteristics of the articles to be dried.
Furthermore, the air supply opening is sequentially arranged on one side of the drying tunnel, and a fresh air component is arranged on the other side of the drying tunnel and comprises an outdoor fresh air inlet and an outdoor air exhaust outlet which are respectively arranged at two ends of the drying tunnel.
Furthermore, the fresh air assembly also comprises a fresh air preheating heat exchanger arranged at an outdoor fresh air inlet and a fresh air precooling heat exchanger arranged at an outdoor air exhaust outlet;
and a throttling element and a compressor are also arranged between the fresh air preheating heat exchanger and the fresh air precooling heat exchanger, and the throttling element and the compressor are communicated with refrigerant channels of the fresh air preheating heat exchanger and the fresh air precooling heat exchanger to form refrigerant circulation so as to remove waste heat in the drying tunnel.
Further, each stage of the heat exchanger assembly includes a condenser, an evaporator, and an auxiliary heat exchanger coupled to each other.
Further, each stage of the refrigerant cycle includes: the compressor, the refrigerant channel of the condenser, the throttling element and the refrigerant channel of the evaporator are connected in sequence through refrigerant pipes, and the compressor is connected with the evaporator to form a cycle.
Further, the auxiliary heat exchanger comprises a precooling heat exchanger and a preheating heat exchanger;
each stage of air circulation comprises: the first channel of the precooling heat exchanger, the air channel of the evaporator, the first channel of the preheating heat exchanger and the air channel of the condenser are sequentially connected through an air pipe, and the air channel of the condenser is connected with the air supply outlet;
a first channel of the precooling heat exchanger in the 1 st-stage air circulation is connected with an air return inlet;
in 2 nd-N-1 th-stage air circulation, the first channel of the precooling heat exchanger of the stage is also connected with the air channel of the evaporator of the next stage, and the air channel of the condenser of the stage is also connected with the air channel of the condenser of the previous stage.
As one embodiment of the invention, at least one stage of refrigerant cycle comprises a compressor, a refrigerant passage of a condenser, a second passage of a preheating heat exchanger, a throttling element and a refrigerant passage of an evaporator which are connected in sequence through refrigerant pipes.
As an embodiment of the present invention, at least one stage of heat exchanger assembly is matched with a heat pipe cycle, the heat pipe cycle includes a second channel of the pre-cooling heat exchanger, a circulating pump, and a second channel of the pre-heating heat exchanger, which are connected in sequence, and the second channel of the pre-heating heat exchanger is connected with the second channel of the pre-cooling heat exchanger to form a cycle.
As an embodiment of the invention, the heat exchanger assemblies of stage 1 and/or N are fitted with a refrigerant cycle for removing waste heat in the drying tunnel.
As an embodiment of the invention, the connection of the evaporators and the condensers of each stage adopts a multi-split air conditioner mode, a compressor is shared, and the refrigerant is distributed to the refrigerant circulation of each stage by combining and splitting;
the closed heat pump drying system also comprises an outdoor heat exchanger and an outdoor flow path connected with the outdoor heat exchanger, so that redundant waste heat of the drying tunnel is eliminated.
The above embodiments are illustrated below by way of a 4-stage heat exchange assembly overall structure:
the multi-heat exchanger closed drying system comprises four pairs of evaporators and condensers, and at least comprises a first evaporator, a second evaporator, a third evaporator, a fourth evaporator, a first condenser, a second condenser, a third condenser and a fourth condenser. In addition, an auxiliary heat exchanger can be arranged as required, and comprises a first precooling heat exchanger, a second precooling heat exchanger, a third precooling heat exchanger, a fourth precooling heat exchanger, a first preheating heat exchanger, a second preheating heat exchanger, a third preheating heat exchanger, a fourth preheating heat exchanger, a fresh air precooling heat exchanger, a fresh air preheating heat exchanger and an outdoor heat exchanger. The auxiliary heat exchanger can be composed of a plurality of heat exchangers according to the requirement.
The drying tunnel is internally provided with articles to be dried which move along with the conveyor belt, and is sequentially provided with an air return inlet, an air outlet, a first air supply outlet, a second air supply outlet, a third air supply outlet, a fourth air supply outlet and a fresh air inlet along the moving direction of the conveyor belt.
Air circulation is carried out, so that air flow paths of the heat exchangers (except the outdoor heat exchanger) are communicated in a certain sequence. The air flow paths of the respective heat exchangers are connected as follows: the drying tunnel air return inlet, the first precooling heat exchanger, the first evaporator, the second precooling heat exchanger, the second evaporator, the third precooling heat exchanger, the third evaporator, the fourth precooling heat exchanger, the fourth evaporator, the fourth preheating heat exchanger, the fourth condenser, the third condenser, the second condenser, the first condenser and the drying tunnel first air supply outlet are sequentially connected. A first air bypass flow path is arranged between the first evaporator and the second precooling heat exchanger, and the air bypass flow path passes through the first preheating heat exchanger and is connected to an air channel between the first condenser and the second condenser. And a second air bypass flow path is arranged between the second evaporator and the third precooling heat exchanger, passes through the second preheating heat exchanger and is connected to an air channel between the second condenser and the third condenser. And a third air bypass flow path is arranged between the third evaporator and the fourth precooling heat exchanger, passes through the third preheating heat exchanger and is connected to an air channel between the third condenser and the fourth condenser. The second condenser, the third condenser and the fourth condenser are respectively communicated with a second air supply outlet, a third air supply outlet and a fourth air supply outlet of the drying channel. The fresh air inlet, the fresh air precooling heat exchanger and the fresh air inlet of the drying tunnel are sequentially connected. The heat exchangers are communicated with each other through an air flow path to form air circulation. However, the connecting air ducts between the air flow paths of the heat exchangers are not all necessary, and the connecting air ducts can be reduced according to the existence of the heat exchangers and the requirement of the drying system.
The refrigerant circulation is composed of at least one evaporator, one condenser (or outdoor heat exchanger), compressor and throttle element. The throttling element comprises an expansion valve, a capillary tube, a short tube, an orifice plate and other common throttling elements of a vapor compression refrigeration system.
Preferably, the preheating heat exchanger can be used as a subcooler of the refrigerant circulation, the cold energy of the recovered air circulation increases the circulation supercooling degree, and the circulation efficiency is improved.
The heat pipe circulation consists of a precooling heat exchanger, a preheating heat exchanger or an outdoor heat exchanger and a circulating pump.
The invention relates to a multi-heat exchanger networked recombined closed heat pump drying system, which comprises the following components in the operation process: the return air of the drying tunnel with low temperature and high humidity sequentially flows through all stages of precooling heat exchangers and evaporators, is cooled and dehumidified in the precooling heat exchangers and the evaporators (when the temperature is reduced to be below the dew point temperature), is reheated in the preheating heat exchangers and the condensers to form high-temperature and low-humidity dry hot air, and then is sent into the drying tunnel through all stages of air supply outlets to complete air circulation.
In each stage of refrigerant circulation, low-temperature and low-pressure refrigerant is sucked into a compressor, compressed into high-temperature and high-pressure refrigerant gas, then condensed by a condenser to release heat to return air (in the circulation with supercooling, the refrigerant can continuously flow through a subcooler to be subcooled and then heated back to return air), throttled by a throttling element to form low-temperature and low-pressure two-phase refrigerant, enters an evaporator to be evaporated to absorb heat from the return air, and becomes low-temperature and low-pressure refrigerant gas again to complete the refrigerant circulation.
In each stage of heat pipe circulation, under the driving of a circulating pump, a refrigerant is evaporated in a precooling heat exchanger, absorbs heat from flowing return air to reduce the temperature and the humidity of the return air, then flows through a preheating heat exchanger to be condensed, and releases heat to the flowing return air, so that the heat is transferred from one side of the precooling heat exchanger to one side of the preheating heat exchanger (or from one side of the precooling heat exchanger to one side of an outdoor heat exchanger), and the heat pipe circulation is completed.
(1) As an embodiment of the present invention, each stage of the evaporator and the condenser constitutes a typical refrigerant cycle (for example, the first evaporator, the first compressor, the first condenser, and the first throttling element are connected in sequence to constitute a first refrigerant cycle), and each refrigerant cycle is connected in parallel to constitute a cascade suction and exhaust cycle, so as to realize cascade cooling and dehumidification and cascade heating of return air. Each precooling heat exchanger and each preheating heat exchanger form a heat pipe circulation in a group so as to recover the cold energy of return air after the evaporator.
Particularly, the first precooling heat exchanger consists of two parts, the first part is connected with the first preheating heat exchanger to form a first heat pipe cycle, and the second part is connected with the outdoor heat exchanger and used for removing redundant waste heat of the closed drying tunnel system.
The air flow direction and the components of each cycle in this embodiment are connected as follows:
the air circulation flow path:
a first air circulation: air returning from drying tunnel → first precooling heat exchanger (heat discharging part to outdoor) → first evaporator → first preheating heat exchanger → first condenser (mixing with second condenser shunting part) → first air supply outlet
And (3) second air circulation: air returning from the drying tunnel → first precooling heat exchanger (heat discharging part to outdoor) → first evaporator → second precooling heat exchanger → second evaporator → second preheating heat exchanger → second condenser (mixing with third condenser shunting part) → second air supply outlet
And (3) third air circulation: air returning from the drying tunnel → first precooling heat exchanger (heat discharging part to outdoor) → first evaporator → second precooling heat exchanger → second evaporator → third precooling heat exchanger → third evaporator → third preheating heat exchanger → third condenser (mixed with the diversion part of the fourth condenser) → third air supply outlet
And fourth air circulation: air returning from the drying tunnel → first precooling heat exchanger (heat rejecting portion to the outdoor) → first evaporator → second precooling heat exchanger → second evaporator → third precooling heat exchanger → third evaporator → fourth precooling heat exchanger → fourth evaporator → fourth preheating heat exchanger → fourth condenser → fourth supply-air outlet
The refrigerant circulation flow path:
a first refrigerant cycle: first evaporator → first compressor → first condenser → first throttling element → first evaporator
The second, third, and fourth refrigerant cycles are similar.
The heat pipe circulation flow path:
first heat pipe circulation: first precooling heat exchanger → first circulating pump → first preheating heat exchanger → first precooling heat exchanger
The second, third and fourth heat pipes are similar in cycle.
In particular, the heat pipe cycle for removing the waste heat inside the drying tunnel: first precooling heat exchanger → outdoor heat exchanger → circulating pump → first precooling heat exchanger
(2) As another embodiment of the present invention, each stage of the evaporator and the condenser forms a typical refrigerant cycle (for example, the first evaporator, the first compressor, the first condenser, and the first throttling element are connected in sequence to form the first refrigerant cycle), and each refrigerant cycle is connected in parallel to form a cascade suction and exhaust cycle, so as to realize cascade temperature reduction and dehumidification and cascade heating of the return air. Each precooling heat exchanger and each preheating heat exchanger form a heat pipe circulation in a group so as to recover the cold energy of return air after the evaporator.
Particularly, the fourth precooling heat exchanger and the fourth preheating heat exchanger are connected in a refrigerant circulating mode and are connected into an outdoor heat exchanger to serve as a condenser, and the condenser is used for removing waste heat of the drying tunnel.
The air flow direction and the components of each cycle in this embodiment are connected as follows:
the air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → first preheating heat exchanger → first condenser (mixed with second condenser shunting part) → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second precooling heat exchanger → second evaporator → second preheating heat exchanger → second condenser (mixed with third condenser split flow part) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second precooling heat exchanger → second evaporator → third precooling heat exchanger → third evaporator → third preheating heat exchanger → third condenser (mixed with the fourth condenser split flow part) → third air supply outlet
And fourth air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second precooling heat exchanger → second evaporator → third precooling heat exchanger → third evaporator → fourth precooling heat exchanger → fourth evaporator → fourth preheating heat exchanger → fourth condenser → fourth supply air outlet
The refrigerant circulation flow path:
a first refrigerant cycle: first evaporator → first compressor → first condenser → first throttling element → first evaporator
The second, third, and fourth refrigerant cycles are similar.
In particular, the refrigerant cycle for removing waste heat in the drying tunnel: fourth precooling heat exchanger → compressor → outdoor heat exchanger → fourth preheating heat exchanger → throttling element → fourth precooling heat exchanger
The heat pipe circulation flow path:
first heat pipe circulation: first precooling heat exchanger → first circulating pump → first preheating heat exchanger → first precooling heat exchanger
The second and third heat pipes are similar in cycle.
(3) As another embodiment of the present invention, each stage of the evaporator and the condenser forms a typical refrigerant cycle (for example, the first evaporator, the first compressor, the first condenser, and the first throttling element are connected in sequence to form the first refrigerant cycle), and each refrigerant cycle is connected in parallel to form a cascade suction and exhaust cycle, so as to realize cascade temperature reduction and dehumidification and cascade heating of the return air. Each precooling heat exchanger and each preheating heat exchanger form a heat pipe circulation in a group so as to recover the cold energy of return air after the evaporator.
Particularly, the fresh air is heated by using the refrigerant circulation of the fresh air precooling heat exchanger and the fresh air preheating heat exchanger, and then is sent into the drying tunnel for dehumidification, and the exhaust air saturated with moisture is sent outdoors after heat recovery for removing waste heat in the drying tunnel.
The air flow direction and the components of each cycle in this embodiment are connected as follows:
the air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → first preheating heat exchanger → first condenser (mixed with second condenser shunting part) → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second precooling heat exchanger → second evaporator → second preheating heat exchanger → second condenser (mixed with third condenser split flow part) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second precooling heat exchanger → second evaporator → third precooling heat exchanger → third evaporator → third preheating heat exchanger → third condenser (mixed with the fourth condenser split flow part) → third air supply outlet
And fourth air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second precooling heat exchanger → second evaporator → third precooling heat exchanger → third evaporator → fourth precooling heat exchanger → fourth evaporator → fourth preheating heat exchanger → fourth condenser → fourth supply air outlet
In particular, the fresh air flow path for removing the waste heat of the drying tunnel: outdoor fresh air → outdoor fresh air preheating heat exchanger → drying tunnel → outdoor fresh air precooling heat exchanger → discharge to outdoor
The refrigerant circulation flow path:
a first refrigerant cycle: first evaporator → first compressor → first condenser → first throttling element → first evaporator
The second, third, and fourth refrigerant cycles are similar.
In particular, the fresh air constitutes a refrigerant cycle for removing waste heat in the drying tunnel: fresh air precooling heat exchanger → compressor → fresh air preheating heat exchanger → throttling element → fresh air precooling heat exchanger
The heat pipe circulation flow path:
first heat pipe circulation: first precooling heat exchanger → first circulating pump → first preheating heat exchanger → first precooling heat exchanger
The second, third and fourth heat pipes are similar in cycle.
(4) As another embodiment of the present invention, each stage of the evaporator, the condenser and the preheat heat exchanger form a refrigerant cycle with subcooling, wherein the preheat heat exchanger serves as a subcooler (for example, the first evaporator, the first compressor, the first condenser, the first preheat heat exchanger and the first throttling element are connected in sequence to form a first refrigerant cycle), and each refrigerant cycle is connected in parallel to form a step air suction and exhaust cycle, so as to realize step cooling and dehumidification and step heating of return air.
Particularly, at this time, no intermediate-stage precooling heat exchanger is arranged, and only the first precooling heat exchanger is connected with the outdoor heat exchanger to form heat pipe circulation for removing redundant waste heat in the drying tunnel.
The air flow direction and the components of each cycle in this embodiment are connected as follows:
the air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → first preheating heat exchanger → first condenser (mixed with second condenser shunting part) → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second preheating heat exchanger → second condenser (mixed with third condenser shunting part) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second evaporator → third preheating heat exchanger → third condenser (mixed with the fourth condenser split flow part) → third air supply outlet
And fourth air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second evaporator → third evaporator → fourth preheating heat exchanger → fourth condenser → fourth supply-air outlet
The refrigerant circulation flow path:
a first refrigerant cycle: first evaporator → first compressor → first condenser → first preheat heat exchanger → first throttling element → first evaporator
The second, third, and fourth refrigerant cycles are similar.
The heat pipe circulation flow path:
heat pipe circulation for removing waste heat in the drying tunnel: first precooling heat exchanger → outdoor heat exchanger → circulating pump → first precooling heat exchanger
(5) As another embodiment of the invention, the connection modes of the refrigerant circulation and the heat pipe circulation can be organically combined, and the air side circulation can also be subjected to certain splitting and repeated series-parallel combination, so that various heat production, consumption and transfer technologies can be flexibly used, and the requirements of different air supply states in the drying tunnel can be met.
The air flow direction and the components of each cycle in this embodiment are connected as follows:
the air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second preheating heat exchanger → second condenser → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second evaporator → third precooling heat exchanger → third evaporator → third preheating heat exchanger → third condenser (mixed with the diversion part of the fourth condenser) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger → first evaporator → second evaporator → third precooling heat exchanger → third evaporator → fourth precooling heat exchanger → fourth evaporator → fourth preheating heat exchanger → fourth condenser → third condenser → second return air inlet
The refrigerant circulation flow path:
a first refrigerant cycle: first evaporator → first compressor → first condenser → first throttling element → first evaporator
A second refrigerant cycle: second evaporator → second compressor → second condenser → second preheat heat exchanger → second throttling element → second evaporator
A third refrigerant cycle: third evaporator → third compressor → third condenser → third throttling element → third evaporator
A fourth refrigerant cycle: fourth evaporator → fourth compressor → fourth condenser → fourth throttling element → fourth evaporator
In addition, there is a refrigerant cycle for removing the waste heat of the drying tunnel: fourth precooling heat exchanger → compressor → outdoor heat exchanger → fourth preheating heat exchanger → throttling element → fourth precooling heat exchanger
The heat pipe circulation flow path:
and circulating a third heat pipe: third precooling heat exchanger → circulating pump → third preheating heat exchanger → third precooling heat exchanger
Heat pipe circulation for removing waste heat in the drying tunnel: first precooling heat exchanger → outdoor heat exchanger → circulating pump → first precooling heat exchanger
(6) As another embodiment of the present invention, the evaporator and condenser of each stage can be connected in a multi-split air-conditioning system, sharing a compressor, and distributing refrigerant by splitting and combining. And additionally arranging a first-stage outdoor flow path connected in parallel and connected with an outdoor heat exchanger for removing redundant waste heat of the drying tunnel.
The air flow direction and the components of each cycle in this embodiment are connected as follows:
the air circulation flow path:
a first air circulation: drying tunnel return air → first evaporator → first preheat heat exchanger → first condenser → first supply air outlet
And (3) second air circulation: drying tunnel return air → first evaporator → second preheat exchanger → second condenser → second supply outlet
And (3) third air circulation: drying tunnel return air → first evaporator → second evaporator → third preheat exchanger → third condenser → third supply-air outlet
And fourth air circulation: drying tunnel return air → first evaporator → second evaporator → third evaporator → fourth preheat exchanger → fourth condenser → fourth supply-air outlet
The refrigerant circulation flow path:
a first refrigerant cycle: first evaporator → compressor → first condenser → first preheat heat exchanger → first throttling element → first evaporator
The second, third, and fourth refrigerant cycles are similar.
In particular, since the compressor is shared in the form similar to the multi-split air conditioner, the refrigerant at the outlet of the compressor is divided and flows into the first to fourth condensers; similarly, the refrigerants flowing out of the first to fourth evaporators are merged and then flow into the compressor in a unified manner.
In particular, a refrigerant circulation flow path for removing excess waste heat is also provided: two ends of the outdoor heat exchanger are respectively connected with two ends of the first condenser to the fourth condenser, and are connected in parallel with the first condenser to radiate heat to outdoor air.
The invention discloses a multi-heat exchanger networked and recombined closed heat pump drying system, which is a closed drying system with the heat exchanger network and air circulation, wherein the heat exchangers are connected with each other through refrigerant circulation and heat pipe circulation, so that the multistage dehumidification and multistage heating of air, heat energy recovery in the air circulation and system waste heat discharge can be realized.
Compared with the prior art, the invention has the following beneficial effects:
1. the temperature and humidity field is matched uniformly, and the system energy efficiency is high. By adopting the networking recombination mode of the multiple heat exchangers, the refrigerant circulation side and the return air side are interacted, so that the cascade cooling, dehumidification and cascade heating are realized, the circulation pressure ratio of each stage is reduced, and the circulation energy efficiency is higher. The step air supply of drying tunnel side realizes and treats the humiture field matching of the dry characteristic of stoving thing, and dehumidification speed is fast, and drying efficiency is high.
2. The energy distribution is reasonable and the utilization is full. The heat exchanger network introduces the precooling and preheating processes of air circulation, and allows the carrying and transfer of cold and heat to be realized by adopting different modes of heat pipe circulation and refrigerant circulation, thereby reasonably distributing the heat in the system. Through this technical scheme, the low temperature cold energy of returning air behind the evaporimeter at different levels is transferred and is used for precooling import return air, has promoted the latent heat proportion of dehumidification in the evaporimeter heat transfer capacity, has promoted the dehumidification efficiency.
3. The flexibility is good, possesses technical universality. The heat exchanger network recombination of the invention can realize different system schemes, adapt to corresponding drying process requirements, consider practical constraint conditions such as economical practicability and the like, optimize the series number of the heat exchanger network and obtain the system form with the highest energy efficiency under the condition of relatively simple structure.
Drawings
FIG. 1 is a schematic diagram of the heat exchanger network of the present invention.
Fig. 2 is a schematic diagram of the multi-heat exchanger closed heat pump drying system in embodiment 1.
Fig. 3 is a schematic diagram of a multi-heat exchanger closed heat pump drying system in embodiment 2.
Fig. 4 is a schematic diagram of a multi-heat exchanger closed heat pump drying system in embodiment 3.
Fig. 5 is a schematic diagram of a multi-heat exchanger closed heat pump drying system in embodiment 4.
Fig. 6 is a schematic diagram of a multi-heat exchanger closed heat pump drying system in embodiment 5.
Fig. 7 is a schematic diagram of a multi-heat exchanger closed heat pump drying system in embodiment 6.
In the figure: 1. a first evaporator, 2, a second evaporator, 3, a third evaporator, 4, a fourth evaporator, 11, a first condenser, 12, a second condenser, 13, a third condenser, 14, a fourth condenser, 21 (21-1/21-2), a first precooling heat exchanger, 22, a second precooling heat exchanger, 23, a third precooling heat exchanger, 24, a fourth precooling heat exchanger, 31, a first preheating heat exchanger, 32, a second preheating heat exchanger, 33, a third preheating heat exchanger, 34, a fourth preheating heat exchanger, 41 (41-1/41-2), an outdoor heat exchanger, 42, a fresh air precooling heat exchanger, 43, a fresh air preheating heat exchanger, 50, a drying tunnel, 51, an outdoor fresh air inlet, 52, an outdoor exhaust air outlet, 60, a first compressor, 61, a second compressor, 62, a third compressor, 63, a fourth compressor, 64. the drying tunnel air conditioner comprises a compressor, 70, a first throttling element, 71, a second throttling element, 72, a third throttling element, 73, a fourth throttling element, 74, a throttling element, 80, a first circulating pump, 81, a second circulating pump, 82, a third circulating pump, 83, a fourth circulating pump, 84, a circulating pump, 91, a drying tunnel first air supply opening, 92, a drying tunnel second air supply opening, 93, a drying tunnel third air supply opening, 94, a drying tunnel fourth air supply opening, 95, a drying tunnel fresh air opening, 96 and a drying tunnel air outlet.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The closed heat pump drying system with the multiple heat exchangers networked and recombined in the embodiment comprises a heat exchanger network, a drying tunnel, and air circulation, refrigerant circulation and heat pipe circulation which are connected with the heat exchangers.
The heat exchanger network comprises an evaporator, a condenser, auxiliary heat exchangers (a precooling heat exchanger, a preheating heat exchanger, an outdoor heat exchanger) and the like. For a closed drying system, the number of the heat exchangers is not limited, the patent only takes the multi-heat exchanger closed drying system comprising four pairs of evaporators and condensers as an example for explanation, and the number of the heat exchangers is increased or decreased under the condition of not changing the substantial structure of the heat exchanger network, which are all within the protection range of the patent.
The articles to be dried in the drying tunnel 50 move along with the conveyor belt, and a return air inlet 97, an air outlet 96, a first air supply outlet 91, a second air supply outlet 92, a third air supply outlet 93, a fourth air supply outlet 94 and a fresh air inlet 95 are sequentially arranged along the moving direction of the conveyor belt.
The air circulation makes the air flow paths of all the heat exchangers (except the outdoor heat exchanger) communicated in a certain sequence. The heat exchangers are communicated with each other through an air flow path to form air circulation. However, the connecting air ducts between the air flow paths of the heat exchangers are not all necessary, and the connecting air ducts can be reduced according to the existence of the heat exchangers and the requirement of the drying system.
The refrigerant circulation is composed of at least one evaporator, one condenser (or outdoor heat exchanger), compressor and throttle element. The throttling element comprises an expansion valve, a capillary tube, a short tube, an orifice plate and other common throttling elements of a vapor compression refrigeration system.
Preferably, the preheating heat exchanger can be used as a subcooler of the refrigerant circulation, the cold energy of the recovered air circulation increases the circulation supercooling degree, and the circulation efficiency is improved.
The heat pipe circulation is composed of a precooling heat exchanger, a preheating heat exchanger, an outdoor heat exchanger and a circulating pump.
In the operation process: the return air of the drying tunnel with low temperature and high humidity sequentially flows through all stages of precooling heat exchangers and evaporators, is cooled and dehumidified in the precooling heat exchangers and the evaporators (when the temperature is reduced to be below the dew point temperature), is reheated in the preheating heat exchangers and the condensers to form high-temperature and low-humidity dry hot air, and then is sent into the drying tunnel through all stages of air supply outlets to complete air circulation.
In each stage of refrigerant circulation, low-temperature and low-pressure refrigerant is sucked into a compressor, compressed into high-temperature and high-pressure refrigerant gas, then condensed by a condenser to release heat to return air (in the circulation with supercooling, the refrigerant can continuously flow through a subcooler to be subcooled and then heated back to return air), throttled by a throttling element to form low-temperature and low-pressure two-phase refrigerant, enters an evaporator to be evaporated to absorb heat from the return air, and becomes low-temperature and low-pressure refrigerant gas again to complete the refrigerant circulation.
In each stage of heat pipe circulation, under the drive of a circulating pump, a refrigerant is evaporated in the precooling heat exchanger, absorbs heat from flowing return air to reduce the temperature and the humidity of the return air, then flows through the preheating heat exchanger to be condensed, and releases heat to the flowing return air, so that the heat is transferred from one side of the precooling heat exchanger to one side of the preheating heat exchanger, and the heat pipe circulation is completed.
In the present embodiment, referring to fig. 2, each stage of evaporator and condenser constitutes a typical refrigerant cycle (for example, the first evaporator 1, the first compressor 60, the first condenser 11, and the first throttling element 70 are connected in sequence to constitute a first refrigerant cycle), and each refrigerant cycle is connected in parallel to constitute a cascade suction and exhaust cycle, so as to realize the cascade cooling and dehumidification and the cascade heating of the return air. Each precooling heat exchanger and each preheating heat exchanger form a heat pipe circulation in a group so as to recover the cold energy of return air after the evaporator.
Particularly, the first precooling heat exchanger 21 is composed of two parts, the first part 21-1 is connected with the first preheating heat exchanger to form a first heat pipe cycle, and the second part 21-2 is connected with the outdoor heat exchanger to remove redundant waste heat of the closed drying tunnel system.
The air flow direction and the connection of the components of each cycle in this embodiment are as follows:
air circulation flow path:
a first air circulation: air return of drying tunnel → first precooling heat exchanger 21-1 → first precooling heat exchanger 21-2 (to outdoor heat rejection part) → first evaporator 1 → first preheating heat exchanger 31 → first condenser 11 (mixed with the diversion part of second condenser 12) → first air supply outlet
And (3) second air circulation: air return of drying tunnel → first precooling heat exchanger 21-1 → first precooling heat exchanger 21-2 (to outdoor heat rejection part) → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → second preheating heat exchanger 32 → second condenser 12 (mixed with third condenser 13 split part) → second air supply outlet
And (3) third air circulation: air return of drying tunnel → first precooling heat exchanger 21-1 → first precooling heat exchanger 21-2 (to outdoor heat rejection part) → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → third preheating heat exchanger 33 → third condenser 13 (mixed with the diversion part of fourth condenser 14) → third air supply outlet
And fourth air circulation: air-returning in the drying tunnel → first precooling heat exchanger 21-1 → first precooling heat exchanger 21-2 (to the outdoor heat rejection part) → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → fourth precooling heat exchanger 24 → fourth evaporator 4 → fourth preheating heat exchanger 34 → fourth condenser 14 → fourth air-sending outlet
Refrigerant circulation flow path:
a first refrigerant cycle: first evaporator 1 → first compressor 60 → first condenser 11 → first throttling element 70 → first evaporator 1
The second, third and fourth refrigerant cycles are similar, and the corresponding numbers are matched.
Heat pipe circulation flow path:
first heat pipe circulation: first precooling heat exchanger 21-1 → first circulation pump 80 → first preheating heat exchanger 31 → first precooling heat exchanger 21-1
The second, third and fourth heat pipes have similar circulation and are matched with corresponding serial numbers.
In particular, the heat pipe cycle for removing the waste heat inside the drying tunnel: first precooling heat exchanger 21-2 → outdoor heat exchanger 41 → circulating pump 84 → first precooling heat exchanger 21-2
Example 2
This embodiment is similar to the basic principle and component connection of embodiment 1, and the main difference is that a refrigerant cycle is used instead of a heat pipe cycle to remove waste heat. Referring to fig. 3, in particular, fourth pre-cooling heat exchanger 24 and fourth pre-heating heat exchanger 34 are connected in a refrigerant cycle and are coupled to outdoor heat exchanger 41 as a condenser for removing drying tunnel waste heat. Because the air at the tail end is a deep dehumidification link, the required refrigerant evaporation temperature is the lowest, and therefore the heat-dissipation refrigerant cycle is arranged at the last stage of the tail end, and the refrigerant cycle energy efficiency is improved.
The air flow direction and the connection of the components of each cycle in this embodiment are as follows:
air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → first preheating heat exchanger 31 → first condenser 11 (mixed with the split part of second condenser 12) → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → second preheating heat exchanger 32 → second condenser 12 (mixed with the branched portion of third condenser 13) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → third preheating heat exchanger 33 → third condenser 13 (mixed with fourth condenser split flow portion 14) → third supply-air outlet
And fourth air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → fourth precooling heat exchanger 24 → fourth evaporator 4 → fourth preheating heat exchanger 34 → fourth condenser 14 → fourth supply-air outlet
Refrigerant circulation flow path:
a first refrigerant cycle: first evaporator 1 → first compressor 60 → first condenser 11 → first throttling element 70 → first evaporator 1
The second, third and fourth refrigerant cycles are similar, and the corresponding numbers are matched.
In particular, the refrigerant cycle for removing waste heat in the drying tunnel: fourth pre-cooling heat exchanger 24 → compressor 64 → outdoor heat exchanger 41 → fourth pre-heating heat exchanger 34 → throttling element 74 → fourth pre-cooling heat exchanger 24
Heat pipe circulation flow path:
first heat pipe circulation: first precooling heat exchanger 21 → first circulation pump 80 → first preheating heat exchanger 31 → first precooling heat exchanger 21
The second and third heat pipes have similar circulation and are matched with corresponding serial numbers.
Example 3
The basic principle and the component connection of the embodiment are similar to those of the embodiment 1, and the main difference is that a fresh air heating and dehumidifying method is adopted to remove waste heat. Referring to fig. 4, specifically, by using the refrigerant circulation of the fresh air pre-cooling heat exchanger 42 and the fresh air pre-heating heat exchanger 43, the fresh air 51 is heated and then sent to the drying tunnel 50 for dehumidification, and the exhaust air saturated with moisture is subjected to heat recovery and then sent to the outdoor 52 for removing the waste heat in the drying tunnel.
The air flow direction and the connection of the components of each cycle in this embodiment are as follows:
air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → first preheating heat exchanger 31 → first condenser 11 (mixed with the split part of second condenser 12) → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → second preheating heat exchanger 32 → second condenser 12 (mixed with the branched portion of third condenser 13) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → third preheating heat exchanger 33 → third condenser 13 (mixed with the branched portion of fourth condenser 14) → third air supply outlet
And fourth air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second precooling heat exchanger 22 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → fourth precooling heat exchanger 24 → fourth evaporator 4 → fourth preheating heat exchanger 34 → fourth condenser 14 → fourth supply-air outlet
In particular, the fresh air flow path for removing the waste heat of the drying tunnel: outdoor fresh air 51 → outdoor fresh air preheating heat exchanger 43 → drying tunnel 50 → outdoor fresh air precooling heat exchanger 42 → outdoor fresh air 52
Refrigerant circulation flow path:
a first refrigerant cycle: first evaporator 1 → first compressor 60 → first condenser 11 → first throttling element 70 → first evaporator 1
The second, third and fourth refrigerant cycles are similar, and the corresponding numbers are matched.
In particular, the fresh air constitutes a refrigerant cycle for removing waste heat in the drying tunnel: fresh air pre-cooling heat exchanger 42 → compressor 64 → fresh air pre-heating heat exchanger 43 → throttling element 74 → fresh air pre-cooling heat exchanger 42
Heat pipe circulation flow path:
first heat pipe circulation: first precooling heat exchanger 21 → first circulation pump 80 → first preheating heat exchanger 31 → first precooling heat exchanger 21
The second, third and fourth heat pipes have similar circulation and are matched with corresponding serial numbers.
Example 4
In the present embodiment, referring to fig. 5, each stage of evaporator, condenser and preheat heat exchanger constitutes a refrigerant cycle with subcooling, where the preheat heat exchanger serves as a subcooler (for example, the first evaporator 1, the first compressor 60, the first condenser 11, the first preheat heat exchanger 31 and the first throttling element 70 are connected in sequence to form a first refrigerant cycle), and the refrigerant cycles are connected in parallel to form a step air suction and exhaust cycle, so as to realize step cooling and dehumidification and step heating of return air. At this time, no intermediate-stage precooling heat exchanger is arranged, and only the first precooling heat exchanger 21 is connected with the outdoor heat exchanger 41 to form heat pipe circulation for removing redundant waste heat in the drying tunnel.
The air flow direction and the connection of the components of each cycle in this embodiment are as follows:
air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → first preheating heat exchanger 31 → first condenser 11 (mixed with the split part of second condenser 12) → first air supply outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second evaporator 2 → second preheating heat exchanger 32 → second condenser 12 (mixed with the branched portion of third condenser 13) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second evaporator 2 → third evaporator 3 → third preheating heat exchanger 33 → third condenser 13 (mixed with the branched portion of fourth condenser 14) → third air supply outlet
And fourth air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second evaporator 2 → third evaporator 3 → fourth evaporator 4 → fourth preheating heat exchanger 34 → fourth condenser 14 → fourth supply air outlet
Refrigerant circulation flow path:
a first refrigerant cycle: first evaporator 1 → first compressor 60 → first condenser 11 → first preheat heat exchanger 31 (subcooler) → first throttling element 70 → first evaporator 1
The second, third and fourth refrigerant cycles are similar, and the corresponding numbers are matched.
Heat pipe circulation flow path:
heat pipe circulation for removing waste heat in the drying tunnel: first precooling heat exchanger 21 → outdoor heat exchanger 41 → circulation pump 80 → first precooling heat exchanger 21
Example 5
In this embodiment, referring to fig. 6, the connection modes of the refrigerant cycle and the heat pipe cycle in embodiments 1 to 4 can be organically combined, and the air side cycle can also be subjected to certain splitting and re-serial-parallel combination, so as to flexibly use various heat production, consumption and transfer technologies and match the requirements of different air supply states in the drying tunnel.
The air flow direction and the connection of the components of each cycle in this embodiment are as follows:
air circulation flow path:
a first air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second evaporator 2 → second preheating heat exchanger 32 → second condenser 12 → first condenser 11 → first blower outlet
And (3) second air circulation: drying tunnel return air → first precooling heat exchanger 21 → first evaporator 1 → second evaporator 2 → third precooling heat exchanger 23 → third evaporator 3 → third preheating heat exchanger 33 → third condenser 13 (mixed with the branched portion of fourth condenser 14) → second air supply outlet
And (3) third air circulation: drying tunnel return air → first pre-cooling heat exchanger 21 → first evaporator 1 → second evaporator 2 → third pre-cooling heat exchanger 23 → third evaporator 3 → fourth pre-cooling heat exchanger 24 → fourth evaporator 4 → fourth pre-heating heat exchanger 34 → fourth condenser 14 → third condenser 13 → third supply outlet
Refrigerant circulation flow path:
a first refrigerant cycle: first evaporator 1 → first compressor 60 → first condenser 11 → first throttling element 70 → first evaporator 1
A second refrigerant cycle: second evaporator 2 → second compressor 61 → second condenser 12 → second preheat heat exchanger 32 (subcooler) → second throttling element 71 → second evaporator 2
A third refrigerant cycle: third evaporator 3 → third compressor 62 → third condenser 13 → third throttling element 72 → third evaporator 3
A fourth refrigerant cycle: fourth evaporator 4 → fourth compressor 63 → fourth condenser 14 → fourth throttling element 73 → fourth evaporator 4
In addition, there is a refrigerant cycle for removing the waste heat of the drying tunnel: fourth pre-cooling heat exchanger 24 → compressor 64 → outdoor heat exchanger 41-2 → fourth pre-heating heat exchanger 34 → throttling element 74 → fourth pre-cooling heat exchanger 24
Heat pipe circulation flow path:
and circulating a third heat pipe: third precooling heat exchanger 23 → circulating pump 81 → third preheating heat exchanger 33 → third precooling heat exchanger 23
Heat pipe cycle for removal of drying tunnel waste heat: first precooling heat exchanger 21 → outdoor heat exchanger 41-1 → circulating pump 80 → first precooling heat exchanger 21
Example 6
In this embodiment, referring to fig. 7, the connection between the evaporators and the condensers of the respective stages can be implemented in a multi-split air-conditioning system, which shares the compressor and distributes the refrigerant by splitting and dividing the refrigerant. And additionally provided with a first-stage outdoor flow path connected in parallel and connected with an outdoor heat exchanger 41 for removing redundant waste heat of the drying tunnel.
The air flow direction and the connection of the components of each cycle in this embodiment are as follows:
air circulation flow path:
a first air circulation: drying tunnel return air → first evaporator 1 → first preheat exchanger 31 → first condenser 11 → first supply-air outlet
And (3) second air circulation: drying tunnel return air → first evaporator 1 → second evaporator 2 → second preheat exchanger 32 → second condenser 12 → second supply air outlet
And (3) third air circulation: drying tunnel return air → first evaporator 1 → second evaporator 2 → third evaporator 3 → third preheat exchanger 33 → third condenser 13 → third supply air outlet
And fourth air circulation: drying tunnel return air → first evaporator 1 → second evaporator 2 → third evaporator 3 → fourth evaporator 4 → fourth preheat heat exchanger 34 → fourth condenser 14 → fourth supply air outlet
Refrigerant circulation flow path:
a first refrigerant cycle: first evaporator 1 → compressor 60 → first condenser 11 → first preheat heat exchanger 31 (subcooler) → first throttling element 70 → first evaporator 1
The second, third and fourth refrigerant cycles are similar, and the corresponding numbers are matched.
In particular, since the compressor is shared in the form similar to the multi-split air conditioner, the refrigerant at the outlet of the compressor is divided and flows into the first to fourth condensers; similarly, the refrigerants flowing out of the first to fourth evaporators are merged and then flow into the compressor in a unified manner.
In particular, a refrigerant circulation flow path for removing excess waste heat is also provided: both ends of the outdoor heat exchanger 41 are connected to both ends of the first to fourth condensers, respectively, and are connected in parallel thereto to radiate heat to outdoor air.
In the above embodiments, all the components of the refrigerant cycle and the air duct are not completely shown, in the implementation process, the refrigerant circuit is provided with the common refrigeration accessories such as the high-pressure liquid reservoir, the gas-liquid separator, the oil separator, the filter, the dryer and the like, the air duct of the drying duct is provided with the air processing accessories such as the silencer, the humidifier, the heater, the sterilizing device and the like, and different air supply nozzles and air return grilles are selected to change the position of the fan, or a heat exchanger, the fan, the air valve and the like are added without departing from the spirit of the technical scheme of the present invention, so that the present invention cannot be regarded as being substantially improved, and the present invention shall belong to the protection scope of the present invention.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. A closed heat pump drying system with multiple heat exchangers networked and recombined is characterized by comprising a drying tunnel (50) and a heat exchanger network;
the heat exchanger network comprises a plurality of stages of heat exchanger components, and each stage of heat exchanger component is matched with corresponding stage of air circulation and refrigerant circulation;
a conveying unit is arranged in the drying channel (50), and the conveying unit conveys the articles to be dried along the length direction of the drying channel (50);
each stage of air circulation is sequentially arranged in parallel, and each stage of air circulation is communicated with the drying channel (50) through an air supply outlet, so that stepped heating air supply in the length direction of the drying channel (50) is realized, and the temperature and humidity change in the length direction of the drying channel (50) is matched with the temperature and humidity field of the drying characteristic of the articles to be dried;
each stage of the heat exchanger assembly comprises a condenser, an evaporator and an auxiliary heat exchanger which are coupled with each other;
each stage of the refrigerant cycle comprises: the compressor, the refrigerant channel of the condenser, the throttling element and the refrigerant channel of the evaporator are connected in sequence through refrigerant pipes, and the compressor is connected with the evaporator to form a cycle;
the auxiliary heat exchanger comprises a precooling heat exchanger and a preheating heat exchanger;
each stage of air circulation comprises: the first channel of the precooling heat exchanger, the air channel of the evaporator, the first channel of the preheating heat exchanger and the air channel of the condenser are sequentially connected through an air pipe, and the air channel of the condenser is connected with the air supply outlet;
a first channel of the precooling heat exchanger in the 1 st-stage air circulation is connected with an air return port (97);
in 2 nd-N-1 th-stage air circulation, the first channel of the precooling heat exchanger of the stage is also connected with the air channel of the evaporator of the next stage, and the air channel of the condenser of the stage is also connected with the air channel of the condenser of the previous stage.
2. The closed heat pump drying system with the networking and recombination of the multiple heat exchangers as claimed in claim 1, wherein the air supply outlet is sequentially arranged on one side of the drying tunnel (50), and the other side of the drying tunnel (50) is provided with a fresh air component which comprises an outdoor fresh air inlet (51) and an outdoor air exhaust outlet (52) which are respectively arranged on two ends of the drying tunnel (50).
3. The closed heat pump drying system with the networking and recombination of the multiple heat exchangers as recited in claim 2, wherein the fresh air assembly further comprises a fresh air preheating heat exchanger (43) arranged at an outdoor fresh air inlet (51) and a fresh air precooling heat exchanger (42) arranged at an outdoor air exhaust outlet (52);
and a throttling element and a compressor are also arranged between the fresh air preheating heat exchanger (43) and the fresh air precooling heat exchanger (42), and the throttling element and the compressor are communicated with refrigerant channels of the fresh air preheating heat exchanger (43) and the fresh air precooling heat exchanger (42) to form refrigerant circulation so as to remove waste heat in the drying tunnel.
4. The closed heat pump drying system with the networked and recombined multi-heat exchanger as claimed in claim 1, wherein at least one stage of refrigerant cycle comprises a compressor, a refrigerant passage of a condenser, a second passage of the preheating heat exchanger, a throttling element and a refrigerant passage of an evaporator which are sequentially connected through refrigerant pipes.
5. The closed heat pump drying system of claim 1, wherein at least one stage of heat exchanger assembly is matched with heat pipe circulation, the heat pipe circulation comprises a second channel of the precooling heat exchanger, a circulating pump and a second channel of the preheating heat exchanger which are connected in sequence, and the second channel of the preheating heat exchanger is connected with the second channel of the precooling heat exchanger to form circulation.
6. The closed heat pump drying system with the networked recombination of the multiple heat exchangers as claimed in claim 1, wherein the heat exchanger assemblies of the 1 st stage and/or the N th stage are matched with a refrigerant cycle for removing waste heat in the drying tunnel.
7. The closed heat pump drying system of claim 1, wherein the evaporators and the condensers of the stages are connected in a multi-split mode, share a compressor, and distribute refrigerant to the refrigerant circulation of each stage by combining and splitting;
the closed heat pump drying system also comprises an outdoor heat exchanger and an outdoor flow path connected with the outdoor heat exchanger, so that redundant waste heat of the drying tunnel is eliminated.
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| CN104792065B (en) * | 2014-12-19 | 2017-06-20 | 浙江普林艾尔电器工业有限公司 | A kind of dried medium step heats the heat pump with exhaust heat stepped recovery |
| CN205425752U (en) * | 2015-12-24 | 2016-08-03 | 上海岱鼎工业设备有限公司 | Heat pump dryer |
| CN107014198B (en) * | 2016-12-29 | 2019-08-09 | 石曾矿 | The quadruple effect removal moisture drying system of temperature controllable |
| CN108489144B (en) * | 2018-01-29 | 2020-02-14 | 同济大学 | Drying system using cascade multi-connected heat pump |
| CN108507231B (en) * | 2018-04-27 | 2023-12-29 | 浙江普林艾尔电器工业有限公司 | Multistage heating multistage condenser condensate deep supercooling heat pump system |
| CN109945603A (en) * | 2019-03-22 | 2019-06-28 | 广州市集木蓄能技术开发有限公司 | A kind of enclosed heat pump drying system |
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