CN111288682A - Refrigeration and cold and heat recovery integrated system and refrigeration and cold and heat recovery integrated utilization method - Google Patents
Refrigeration and cold and heat recovery integrated system and refrigeration and cold and heat recovery integrated utilization method Download PDFInfo
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- CN111288682A CN111288682A CN202010169005.2A CN202010169005A CN111288682A CN 111288682 A CN111288682 A CN 111288682A CN 202010169005 A CN202010169005 A CN 202010169005A CN 111288682 A CN111288682 A CN 111288682A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/006—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the sorption type system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0014—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using absorption or desorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a refrigeration and cold-heat recovery integrated system, which comprises: a cold source and a heat source; the third heat exchanger is connected with the cold source; the refrigerator is connected with the third heat exchanger and forms a loop with the third heat exchanger; the first heat exchanger is connected with the cold source; the first-stage heat exchanger is connected with a heat source, and at least one loop is formed between the first heat exchanger and the first-stage heat exchanger; at least one valve for switching the working state between the first heat exchanger and the third heat exchanger; by applying the refrigeration and cold and heat recovery integrated system, the running state of the system can be flexibly switched, and different refrigeration capacities and different cold medium flow rates can be adapted; the invention also provides a refrigeration and cold and heat recovery comprehensive utilization method.
Description
Technical Field
The invention relates to the field of medium circulating systems, in particular to a refrigeration and cold and heat recovery integrated system and a refrigeration and cold and heat recovery integrated utilization method.
Background
In the existing factory production environment, there are many cold sources that need to obtain heat to raise temperature, such as liquefied gas output by a low-temperature liquefied gas tank, and there are also heat sources that carry a large amount of heat and need to be recovered, such as boiler cooling water, boiler exhaust gas, and the like; on the other hand, facilities such as a refrigeration system, a dehumidification system and the like arranged in a factory building also need to consume a large amount of energy; the energy utilization of the plant cannot be further improved due to the multiple influences.
At present, the refrigeration of a factory building mainly depends on a heat pump system installed in the factory building, heat in the factory building is discharged outdoors, a large amount of energy is consumed to drive the heat pump system to operate, and devices such as a large-scale compressor and the like are required to be installed, so that the installation is inconvenient.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a refrigeration and cold and heat recovery comprehensive system and a refrigeration and cold and heat recovery comprehensive utilization method, which can flexibly switch the running state of the system and adapt to different refrigeration capacities and different flow rates of cold media.
The refrigeration and cold heat recovery integrated system of one aspect of the present invention comprises: a cold source and a heat source; the third heat exchanger is connected with the cold source; the refrigerator is connected with the third heat exchanger and forms a loop with the third heat exchanger; the first heat exchanger is connected with the cold source; the first-stage heat exchanger is connected with a heat source, and at least one loop is formed between the first heat exchanger and the first-stage heat exchanger; and the at least one valve is used for switching the working state between the first heat exchanger and the third heat exchanger.
Further, the refrigeration and cold and heat recovery integrated system comprises a second valve and a fourth valve, wherein the second valve is connected with the cold source and the first heat exchanger, the fourth valve is connected with the first heat exchanger and the exhaust port, and the fourth valve is connected with the second valve and the fourth valve to enable the cold medium to flow out of the cold source and flow through the third heat exchanger to be discharged.
Furthermore, refrigeration and cold and heat recovery integrated system includes first valve and fourth valve, and cold source and third heat exchanger are connected to first valve, and first heat exchanger and gas vent are connected to the fourth valve, and first valve and fourth valve are constructed to make cold medium flow out from the cold source, discharge after passing through first heat exchanger and third heat exchanger in proper order.
Furthermore, the refrigeration and cold and heat recovery integrated system comprises a third valve, the third valve is connected with the first heat exchanger and the third heat exchanger, the third valve is constructed to enable the cold medium to flow out of the cold source and then to be divided into two paths, one path of cold medium passes through the first heat exchanger and then is discharged, and the other path of cold medium passes through the third heat exchanger and then is discharged.
Further, the first heat exchanger is connected with a first circulating pump, and the third heat exchanger is connected with a third circulating pump.
The refrigeration and cold heat recovery comprehensive utilization method is characterized by comprising the following steps of: switching the operation state, and controlling at least one valve to enable the cold medium to flow out of the cold source and then pass through the first heat exchanger and/or the third heat exchanger; when the cold medium flows through the first heat exchanger, the cold medium and the heat medium flowing out of the heat source exchange heat through the first heat exchanger and the primary heat exchanger; when the cold medium flows through the third heat exchanger, the cold medium transfers cold to the refrigerator through the third heat exchanger.
Further, the step of switching the operation state comprises: and closing the second valve and the fourth valve, so that the cold medium flows through the second heat exchanger after flowing out of the cold source and is then discharged from the exhaust port.
Further, the step of switching the operation state comprises: and closing the first valve and the fourth valve to enable the cold medium to sequentially pass through the first heat exchanger and the third heat exchanger after flowing out of the cold source and then to be discharged from the exhaust port.
Further, the step of switching the operation state comprises: and closing the third valve to enable the cold medium to be divided into two paths after flowing out of the cold source, wherein one path of cold medium is discharged after passing through the first heat exchanger, and the other path of cold medium is discharged after passing through the third heat exchanger.
Further, the refrigeration and cold and heat recovery comprehensive utilization method further comprises the following steps: controlling the first circulating pump and adjusting the flow between the first heat exchanger and the second heat exchanger; and/or controlling the third circulating pump to adjust the flow between the third heat exchanger and the refrigerator.
When the refrigeration and cold and heat recovery integrated system is used, the working states of the first heat exchanger and the third heat exchanger can be switched by adjusting the state of the valve, so that the whole system can reach a better running state under the condition that the cold quantity of a cold source is sufficient and insufficient, and the cold quantity utilization efficiency of the system is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a second system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a third system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of a fourth system in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a fifth system in accordance with embodiments of the present invention;
the figures contain the following reference numerals:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Liquefied |
410 | |
| 110 | |
420 | |
| 120 | First circulating |
430 | |
| 130 | |
440 | |
| 140 | |
450 | |
| 150 | |
510 | |
| 210 | First- |
520 | |
| 211 | Second circulating |
530 | Two- |
| 310 | |
540 | |
| 320 | Third circulating |
550 | Fourth circulating |
| 330 | Refrigerating device |
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, the system for comprehensively utilizing cold and heat in the first aspect of the present embodiment includes: the heat exchanger is connected with the cold source; a heat exchanger connected with a heat source; a cold source and a heat source; the heat exchanger and the heat exchanger can transfer the heat of the heat source to the cold source.
Use cold and hot comprehensive utilization system of this embodiment, when using, can be through setting up the connecting line between heat exchanger and heat exchanger, with the heat transfer of heat source to cold source for the heat transfer of heat source heaies up for the cold source to the cold source, greatly reduced set up the energy consumption that independent open-frame heat exchanger and heat reclamation device brought, reduced simultaneously and discharged the pollution that causes in the external environment with cold volume and heat.
The heat exchanger and the heat exchanger can transfer heat of a heat source to a cold source in various modes, for example, a loop is formed between the heat exchanger and the heat exchanger, the heat is transferred from the heat source to the cold source through circulation of a heat-conducting medium in the loop, a one-way pipeline can also be arranged between the heat exchanger and the heat exchanger, the heat-conducting medium is heated in the heat exchanger and then is transferred to the heat exchanger for cooling, and the heat is transferred to the cold source; it is also possible to provide the heat exchanger and the heat exchanger as semiconductor heat exchangers and to electrically connect the heat exchanger and the heat exchanger.
It is understood that whether the form of the loop or the one-way pipeline is adopted, the loop or the pipeline can operate by itself without a circulating pump due to the existence of the cold source and the heat source, and certainly, in order to enhance the circulating effect, the circulating pump can be arranged to assist the flow of the heat-conducting medium.
As shown in fig. 1, in order to stably transfer heat from a heat source to a heat source for a long time, a loop formed by a heat exchanger and a heat exchanger may be selected to transfer heat, and if the temperature difference between the heat source and the heat source is too large, the pressure of a heat-conducting medium in the loop is too large, which increases the risk of tube explosion of the loop; in order to reduce the pressure of the heat-conducting medium in the loop and reduce the risk of tube explosion, a second heat exchanger 130 can be arranged in the system, one end of the second heat exchanger 130 and the heat exchanger form a loop, and the other end of the second heat exchanger 130 and the heat exchanger form a loop; as shown in fig. 1, the first heat exchanger 110 and the second heat exchanger 130 form a loop, the second heat exchanger 130 and the first-stage heat exchanger 210 form a loop, and heat is sequentially transferred from a heat source to a cold source through the series connection of the two loops, so that the situation of tube explosion caused by too high pressure of a heat-conducting medium when a single loop is adopted is avoided.
In particular, there is only a heat exchange relationship between the two circuits, and no relationship of the media flowing in relation to each other; similarly, the loop has only heat exchange relationship with the cold source and the loop has only heat exchange relationship with the hot source, and no medium flows in relationship with each other.
Further, in order to enhance the heat exchange efficiency of the circuits, a second circulation pump 211 may be connected between the second heat exchanger 130 and the heat exchanger, or a first circulation pump 120 may be connected between the second heat exchanger 130 and the heat exchanger, to promote the flow of the media in the two circuits; specifically, as shown in fig. 1, a first circulation pump 120 is disposed between the first heat exchanger 110 and the second heat exchanger 130, and a second circulation pump 211 is disposed between the second heat exchanger 130 and the first-stage heat exchanger 210; the heat conduction effect of each loop is enhanced by selectively starting the two circulating pumps, and further, the flow velocity in each loop can be limited by controlling the circulating pumps, so that the cold quantity of the cold source and the heat quantity of the heat source can be better matched.
In order to better utilize the heat of the heat source while further reducing the system pressure, an expander 140 may be connected to the heat exchanger for converting the internal energy of the heat-conducting medium into kinetic energy; wherein the expander 140 can be directly or indirectly connected to the heat exchanger as desired; when the expander 140 is directly connected to the heat exchanger, the heat exchanger and the heat exchanger form a loop, and the expander 140 is located in the loop; when the expander 140 is indirectly connected to the heat exchanger, the expander 140 is located in the circuit formed by the second heat exchanger 130 and the first heat exchanger 110 as shown in fig. 1.
At this time, the expansion machine 140 may be connected to a motor or a fan to further convert the kinetic energy.
Similarly, a dehumidifier 520 may also be provided between the heat exchanger and the heat exchanger for dehumidifying the air; the dehumidifier 520 may be a heat exchange dehumidifier 520 or a solution dehumidifier 520.
When the dehumidifier 520 is the solution dehumidifier 520, a regenerator 540 may be disposed between the heat exchanger and the heat exchanger, and the heat exchange medium passes through the heat exchanger, the dehumidifier 520, the heat exchanger and the regenerator 540 in sequence and returns to the heat exchanger to form a loop; as shown in fig. 2, the fourth heat exchanger 510, the secondary heat exchanger 530, the dehumidifier 520 and the regenerator 540 constitute a circuit.
Further, in order to absorb water vapor in the air efficiently, a lithium bromide solution can be used as a heat exchange ring.
As shown in fig. 2, a fan may be used to drive air through the dehumidifier 520 to achieve better dehumidification.
As shown in fig. 1, the cold source is supplied from a liquefied gas tank 100, and the heat source is supplied from a boiler; specifically, the cold energy is provided by the liquefied gas exhausted from the liquefied gas tank 100 after being gasified, and the heat energy is provided by the flue gas exhausted from the boiler; at the moment, not only can the waste heat of the boiler be effectively recovered, but also the cold energy of the liquefied gas in the liquefied gas tank 100 can be fully utilized, and meanwhile, the pollution to the environment caused by the emission of high-temperature flue gas and the cold energy is reduced; furthermore, the mode of multi-loop series connection can effectively prevent the phenomenon of pipe explosion of a system pipeline caused by overlarge temperature difference between the flue gas and the liquefied gas.
As shown in fig. 2, the industrial dehumidifying apparatus of the second aspect of the present embodiment includes: the first heat exchanger 110 is connected with a cold source; a primary heat exchanger 210 connected to a heat source; the expander 140 is connected with the first heat exchanger 110 and the first-stage heat exchanger 210, and the expander 140 is in driving connection with a fan; the fourth heat exchanger 510 is connected with a cold source; a secondary heat exchanger 530 connected to a heat source; a dehumidifier 520 connecting the first heat exchanger 110 and the primary heat exchanger 210; the blower is used to drive air to flow through the dehumidifier 520 and then to be discharged into the room.
When the industrial dehumidifying device is used, the cold energy required by the operation of the dehumidifier 520 is supplied by the cold source and the heat source through the fourth heat exchanger 510 and the second-stage heat exchanger 530, a heat pump is not required, the energy for driving the heat pump system to operate is greatly saved while the cold energy of the cold source and the heat energy of the heat source are fully utilized, wherein the energy for driving the fan is transmitted by the expander 140 from the cold source and the heat source, and the energy consumption for driving the fan is further reduced.
The energy sources of the dehumidifier 520 and the fan are both from a cold source and a heat source, so that the external power supply can be greatly reduced, and even the external power supply is not needed under the condition of sufficient heat of the heat source.
It should be understood that the first heat exchanger 110, the first-stage heat exchanger 210 and the expander 140 may be connected by a one-way pipe, or may form a loop to achieve a long-term stable operation; similarly, the fourth heat exchanger 510, the secondary heat exchanger 530, and the dehumidifier 520 may be connected by a one-way line or circuit.
As shown in fig. 2, the first heat exchanger 110, the first-stage heat exchanger 210, and the expander 140 constitute a first circuit in which the first circulation pump 120 is disposed; the circulation pump may cause the heat-conducting medium to flow better in the first loop, and the first circulation pump 120 may also be used to control the flow rate of the heat-conducting medium in the first loop, so as to control the output condition of the expander 140.
Similarly, the fourth heat exchanger 510, the secondary heat exchanger 530 and the dehumidifier 520 form a second circuit, and a fourth circulation pump 550 is disposed in the second circuit, and the fourth circulation pump 550 drives the working medium to flow in the second circuit.
Wherein, in order to make dehumidifier 520 can dehumidify the indoor air continuously, avoid dehumidifying and be interrupted, can also set up regenerator 540 in the second return circuit, when heat-conducting medium passes through dehumidifier 520, the medium concentration becomes low after having absorbed the humidity in the air, when the medium flows through regenerator 540, moisture in the medium is got rid of, and medium concentration resumes.
As shown in fig. 2, the second circuit is configured such that the working medium passes through the fourth heat exchanger 510, the dehumidifier 520, the secondary heat exchanger 530, and the regenerator 540 in order and returns to the fourth heat exchanger 510; when the working medium passes through the dehumidifier 520, the working medium absorbs moisture in the air, and the solution concentration becomes low; then the solution enters the secondary heat exchanger 530 to take away heat of a heat source, then enters the regenerator 540, at the moment, moisture in the solution is evaporated by the regenerator 540, the concentration of the solution is increased, then the solution enters the fourth heat exchanger 510, after the solution is cooled, the solubility of solute is reduced, the water absorption capacity of the working medium is increased, then the working medium returns to the dehumidifier 520 to continue dehumidification, the whole system operates in a circulating mode, and the humidity of the indoor environment is guaranteed.
In order to enable the working medium to have better heat conduction and dehumidification performance, a lithium bromide solution can be selected as the working medium.
Further, in order to discharge the moisture evaporated from the regenerator 540, the air passes through the regenerator 540 via the ventilation duct under the driving of the fan and is then discharged to the outside; as shown in fig. 2, the wind blown by the fan is divided into two paths, one path is blown into the room through the dehumidifier 520, and the other path is discharged to the outside through the regenerator 540.
As shown in fig. 2, the first heat exchanger 110 and the fourth heat exchanger 510 are sequentially located downstream of the cool source, and the first-stage heat exchanger 210 and the second-stage heat exchanger 530 are sequentially located downstream of the heat source; the cold source and the heat source exchange heat with the dehumidifier 520 through the fourth heat exchanger 510 and the secondary heat exchanger 530 after being heated and cooled respectively, the temperature difference is small, and the phenomenon that the solute is washed out due to supersaturation of a medium solution caused by too low medium temperature in a loop where the dehumidifier 520 is located and the system operation is influenced can be prevented.
On the other hand, in order to prevent air pollution caused by the contact of the heat transfer medium with air, the dehumidifier 520 may be configured as an evaporator to perform dehumidification by condensation, thereby preventing the contact of the heat transfer medium with air.
Further, a condenser is arranged between the fourth heat exchanger 510 and the secondary heat exchanger 530, the fourth heat exchanger 510, the evaporator, the secondary heat exchanger 530 and the condenser sequentially form a loop, and the fan is used for driving air to sequentially pass through the evaporator and the condenser and then to be discharged into a room; at this time, the heat-conducting medium is evaporated and absorbs heat after passing through the evaporator, so that water vapor in the air is condensed, then the heat-conducting medium is heated through the secondary heat exchanger to take away heat in the heat source, further the heat-conducting medium passes through the condenser to dissipate the heat into the air to heat the air, and then the air passes through the fourth heat exchanger 510 to transfer the heat to the cold source to be cooled and returns to the dehumidifier 520; the fan drives the indoor air to be cooled and dehumidified by the evaporator and then heated by the condenser and discharged to the indoor, so that the temperature drop of a workshop in the dehumidification process is effectively reduced; meanwhile, the dehumidification energy consumption is reduced.
As shown in fig. 1, the refrigeration system of the third aspect of the present embodiment includes: a cold source; the third heat exchanger 310 is connected with the cold source; and a refrigerator 330 connected with the third heat exchanger 310 and forming a loop with the third heat exchanger 310.
When the refrigeration system of the embodiment is used, the cold energy of the refrigerator 330 is continuously supplied by the cold source through the loop formed by the third heat exchanger 310 and the refrigerator 330, the heat pump system is not required to be arranged to provide the cold energy for the refrigerator 330, the energy consumption for driving the heat pump system is greatly reduced, the cold energy of the cold source is applied to indoor environment cooling, and the pollution of cold energy discharge to the environment is effectively reduced.
The refrigeration system comprises a first heat exchanger 110 and a first-stage heat exchanger 210, wherein the first heat exchanger 110 is connected with a cold source, the first-stage heat exchanger 210 is connected with a heat source, and at least one loop is formed between the first heat exchanger 110 and the first-stage heat exchanger 210; at the moment, the waste heat recovery of the refrigeration boiler can be combined, and the energy consumption is further reduced.
Furthermore, in order to reduce the pipeline pressure of the loop in which the first heat exchanger 110 is located, the heat exchanger further comprises a second heat exchanger 130, one side of the second heat exchanger 130 forms a loop with the first heat exchanger 110, and the other side of the second heat exchanger 130 forms a loop with the first-stage heat exchanger 210.
Further, an expander 140 is disposed between the second heat exchanger 130 and the second heat exchanger 130.
In order to enable the refrigeration system to supply the combined cooling and power, an expander 140 is disposed between the first heat exchanger 110 and the second heat exchanger 130.
As shown in fig. 1, a first circulation pump 120 is disposed between the first heat exchanger 110 and the second heat exchanger 130, and a second circulation pump 211 is disposed between the second heat exchanger 130 and the first-stage heat exchanger 210.
It is understood that a circulation pump is provided between the third heat exchanger 310 and the refrigerator 330; wherein the circulating pump can promote the circulation of heat-conducting medium among the refrigeration circuit, can also rationally match the cold volume of cold source and refrigeration user's demand through the refrigeration operating mode of the operating mode control refrigeration circuit of control circulating pump simultaneously.
The refrigerator 330 may be a fan coil, and the air is blown through the fan coil by indoor air, so that the heat-conducting medium cools the air to achieve a refrigerating effect.
Further, the cooling effect can be enhanced by arranging a fan to drive air to blow through the fan coil, wherein the fan can be directly driven by the expander 140, and can also be electrically driven by the generator 150 driven by the expander 140.
In order to facilitate the simultaneous use of the cold energy of the cold source by multiple users, the plate heat exchanger may be used as the refrigerator 330, so that the cold energy enters the water circulation system of the central air conditioner through the plate heat exchanger and is supplied to each end.
A refrigeration and heat recovery integrated system according to a fourth aspect of the present invention is characterized by comprising: a cold source and a heat source; the third heat exchanger 310 is connected with the cold source; the refrigerator 330 is connected with the third heat exchanger 310 and forms a loop with the third heat exchanger 310; the first heat exchanger 110 is connected with a cold source; a primary heat exchanger 210 connected to a heat source, at least one loop being formed between the first heat exchanger 110 and the primary heat exchanger 210; at least one valve for switching the working state between the first heat exchanger 110 and the third heat exchanger 310.
By applying the refrigeration and heat recovery integrated system of the embodiment and the refrigeration and heat recovery integrated system of the invention, when in use, the working states of the first heat exchanger 110 and the third heat exchanger 310 can be switched by adjusting the state of the valve, so that the whole system can reach a better running state under the condition that the cold quantity of the cold source is sufficient and insufficient, and the utilization efficiency of the cold quantity of the system is improved.
Wherein, through the quantity and the position of setting up the valve, can control refrigeration circuit independent operation or with retrieve the return circuit series connection or parallelly connected operation, specifically as follows:
as shown in fig. 3, the integrated refrigeration and heat recovery system includes a second valve 420 and a fourth valve 440, the second valve 420 connects the cool source to the first heat exchanger 110, the fourth valve 440 connects the first heat exchanger 110 to the exhaust port, and the fourth valve 440 connects the second valve 420 and the fourth valve 440 so that the cool medium flows out of the cool source, passes through the third heat exchanger 310, and is discharged; when the cold source is supplied by liquefied gas tank 100, the cold medium is the liquefied gas, second valve 420 and fourth valve 440 all are in the closed condition this moment, liquefied gas is from liquefied gas tank 100 discharge back, directly get into third heat exchanger 310 heat transfer, then directly discharge from the exit, because second valve 420 shuts off, liquefied gas can't get into first heat exchanger 110, and the fourth valve 440 of shutoff also can organize originally the exhaust liquefied gas and flow to first heat exchanger 110 again, can guarantee fully to guarantee to refrigerate when liquefied gas cold volume is not enough under this kind of mode, be applicable to the condition that cold volume and liquefied gas flow are all not enough.
As shown in fig. 4, the refrigeration and heat recovery integrated system includes a first valve 410 and a fourth valve 440, the first valve 410 connects the cold source to the third heat exchanger 310, the fourth valve 440 connects the first heat exchanger 110 to the exhaust port, and the first valve 410 and the fourth valve 440 are configured to allow the cold medium to flow out of the cold source, sequentially pass through the first heat exchanger 110 and the third heat exchanger 310, and then be exhausted; at this time, the first valve 410 and the fourth valve 440 are both in a closed state, the liquefied gas is discharged from the liquefied gas tank 100 and then enters the first heat exchanger 110 for heat exchange, then enters the third heat exchanger 310 for heat exchange, and finally is discharged from the exhaust port.
As shown in fig. 5, the refrigeration system includes a third valve 430, the third valve 430 connects the first heat exchanger 110 and the third heat exchanger 310, the third valve 430 is configured to divide the cold medium flowing out of the cold source into two paths, one path passes through the first heat exchanger 110 and is then discharged, and the other path passes through the third heat exchanger 310 and is then discharged; at this time, the third valve 430 is in a closed state, the liquefied gas is discharged from the liquefied gas tank 100 and then divided into two paths, one path of the liquefied gas is discharged after heat exchange by the first heat exchanger 110, and the other path of the liquefied gas is discharged after heat exchange by the second heat exchanger 130, so that the liquefied gas cooling system is suitable for the condition that the liquefied gas flow and the cold quantity are sufficient.
As shown in fig. 1, a first valve 410, a second valve 420, a third valve 430, a fourth valve 440 and a fifth valve 450 may be provided in the integrated refrigeration and heat recovery system at the same time according to the positions corresponding to fig. 1; when the independent mode needs to be switched, only the second valve 420 and the fourth valve 440 need to be closed, and other valves are opened; when the series mode needs to be switched, only the first valve 410 and the fourth valve 440 need to be closed, and other valves are opened; when the parallel mode needs to be switched, the third valve 430 is only required to be closed, and other valves are only required to be opened, so that flexible switching is achieved.
In the standalone mode, the third valve 430 may be closed together, preventing reverse flow of the heat transfer medium back to the first heat exchanger 110.
Further, the first heat exchanger 110 is connected with the first circulation pump 120, the third heat exchanger 310 is connected with the third circulation pump 320, and the working conditions of the cold-heat exchange and the refrigeration can be controlled by controlling the working conditions of the first circulation pump 120 and the third circulation pump 320.
The refrigeration and cold heat recovery comprehensive utilization method of the fifth aspect of the embodiment is characterized by comprising the following steps: switching the operation state, and controlling at least one valve to enable the cold medium to flow out of the cold source and then pass through the first heat exchanger 110 and/or the third heat exchanger 310; when the cold medium flows through the first heat exchanger 110, the cold medium and the hot medium flowing out of the heat source exchange heat through the first heat exchanger 110 and the primary heat exchanger 210; as the cold medium flows through the third heat exchanger 310, the cold medium transfers cold to the refrigerator 330 through the third heat exchanger 310.
Further, the step of switching the operation state comprises: the second valve 420 and the fourth valve 440 are closed, so that the cooling medium flows through the second heat exchanger 130 after flowing out of the cool source, and is then discharged from the exhaust port; the system is now in stand-alone mode.
Additionally, the switching the operation state step includes: closing the first valve 410 and the fourth valve 440, so that the cooling medium flows out of the cooling source, sequentially passes through the first heat exchanger 110 and the third heat exchanger 310, and is then discharged from the exhaust port; the system is now in series mode.
Further, the step of switching the operation state may include: the third valve 430 is closed, so that the cold medium is divided into two paths after flowing out of the cold source, one path is discharged after passing through the first heat exchanger 110, and the other path is discharged after passing through the third heat exchanger 310; the system is now in parallel mode.
Further, the refrigeration and cold and heat recovery comprehensive utilization method further comprises the following steps: controlling the first circulation pump 120 to adjust the flow rate between the first heat exchanger 110 and the second heat exchanger 130; and/or, controlling the third circulation pump 320 to adjust the flow rate between the third heat exchanger 310 and the refrigerator 330.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A refrigeration and heat recovery integrated system, comprising:
a cold source and a heat source;
a third heat exchanger (310) connected to the cold source;
a refrigerator (330) connected to the third heat exchanger (310) and forming a loop with the third heat exchanger (310);
a first heat exchanger (110) connected with the cold source;
a primary heat exchanger (210) connected to the heat source, at least one circuit being formed between the first heat exchanger (110) and the primary heat exchanger (210);
at least one valve for switching the operating state between the first heat exchanger (110) and the third heat exchanger (310).
2. A combined cooling and heat recovery system according to claim 1, comprising a second valve (420) and a fourth valve (440), wherein the second valve (420) connects the cooling source to the first heat exchanger (110), the fourth valve (440) connects the first heat exchanger (110) to an exhaust, and the fourth valve (440) connects the second valve (420) and the fourth valve (440) is configured such that the cooling medium flows out from the cooling source, passes through the third heat exchanger (310), and is exhausted.
3. A combined cooling and heat recovery system according to claim 1, including a first valve (410) and a fourth valve (440), wherein the first valve (410) connects the cold source to the third heat exchanger (310), the fourth valve (440) connects the first heat exchanger (110) to an exhaust, and the first valve (410) and the fourth valve (440) are configured such that the cold medium flows from the cold source, passes through the first heat exchanger (110) and the third heat exchanger (310) in sequence, and is exhausted.
4. A cooling and heat recovery integrated system as recited in claim 1, further comprising a third valve (430), wherein said third valve (430) connects said first heat exchanger (110) and said third heat exchanger (310), and said third valve (430) is configured to divide the cooling medium flowing out from the cooling source into two paths, one path is discharged after passing through said first heat exchanger (110), and the other path is discharged after passing through said third heat exchanger (310).
5. A combined cooling and heat recovery system according to claim 1, wherein a first circulation pump (120) is connected to the first heat exchanger (110), and a third circulation pump (320) is connected to the third heat exchanger (310).
6. A refrigeration and cold heat recovery comprehensive utilization method is characterized by comprising the following steps:
switching the operation state, and controlling at least one valve to enable the cold medium to flow out of the cold source and then pass through the first heat exchanger (110) and/or the third heat exchanger (310);
when the cold medium flows through the first heat exchanger (110), the cold medium and the hot medium flowing out of the heat source exchange heat through the first heat exchanger (110) and the primary heat exchanger (210);
when the cold medium flows through the third heat exchanger (310), the cold medium transfers cold to the refrigerator (330) through the third heat exchanger (310).
7. A cooling and heat recovery combined use method according to claim 6, wherein the operation state switching step includes: and closing the second valve (420) and the fourth valve (440), so that the cold medium flows through the second heat exchanger (130) after flowing out of the cold source, and then is discharged from the exhaust port.
8. A cooling and heat recovery combined use method according to claim 6, wherein the operation state switching step includes: and closing the first valve (410) and the fourth valve (440), so that the cold medium flows out of the cold source, passes through the first heat exchanger (110) and the third heat exchanger (310) in sequence, and is discharged from an exhaust port.
9. A cooling and heat recovery combined use method according to claim 6, wherein the operation state switching step includes: and closing the third valve (430), so that the cold medium is divided into two paths after flowing out of the cold source, wherein one path is discharged after passing through the first heat exchanger (110), and the other path is discharged after passing through the third heat exchanger (310).
10. A refrigeration and heat recovery combined use method as recited in claim 6, further comprising the steps of: controlling a first circulation pump (120) to regulate a flow between the first heat exchanger (110) and a second heat exchanger (130); and/or controlling a third circulation pump (320) to regulate a flow between the third heat exchanger (310) and the refrigerator (330).
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