CN115028223A - System for sea heat pump unites sea water desalination system operation - Google Patents
System for sea heat pump unites sea water desalination system operation Download PDFInfo
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- 239000013535 sea water Substances 0.000 title claims abstract description 172
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 117
- 239000013505 freshwater Substances 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 230000008014 freezing Effects 0.000 claims description 48
- 238000007710 freezing Methods 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 230000008020 evaporation Effects 0.000 claims description 36
- 238000001704 evaporation Methods 0.000 claims description 36
- 238000002425 crystallisation Methods 0.000 claims description 34
- 230000008025 crystallization Effects 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 21
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005057 refrigeration Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 25
- 230000008569 process Effects 0.000 abstract description 18
- 239000003507 refrigerant Substances 0.000 abstract description 8
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- 230000007797 corrosion Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a system for operating an ocean heat pump and a seawater desalination system in combination, which relates to the technical field of heat pumps and comprises a gas transmission passage, a seawater desalination system and a heat pump system; the heat pump system comprises a heat exchanger, wherein the heat exchanger is used for realizing mutual heat exchange between the gas transmission passage and the seawater passage; the gas transmission passage is used for inputting outside air into the heat exchanger for heat exchange and transmitting the gas after heat exchange to the space to be subjected to temperature regulation; the seawater passage is used for inputting seawater into the heat exchanger for heat exchange and conveying the seawater after heat exchange to the seawater desalination system; the seawater desalination system is used for carrying out desalination treatment on the seawater after heat exchange. In the heat exchange device, air after heat exchange with seawater is transmitted into a space to be temperature-regulated through the air heat exchange flow path, so that the problem of heat energy loss generated in the heat exchange process of the air and a traditional refrigerant is solved, and the utilization efficiency of ocean heat energy is improved; in addition, the seawater desalination efficiency and the fresh water output rate of the seawater desalination system after heat exchange with the heat pump system are obviously improved.
Description
Technical Field
The disclosure relates to the technical field of heat pumps, in particular to a system for operating an ocean heat pump combined seawater desalination system.
Background
Sea water desalination, also known as desalination of sea water or desalination of sea water, refers to a process of removing excess salts and minerals in water to obtain fresh water, and is an open source incremental technology for realizing water resource utilization. The development and industrial application of seawater desalination technology has been half a century history, and industrial technologies such as multistage flash evaporation, freeze crystallization and reverse osmosis are formed in the period. The fresh water yield of the multi-stage flash evaporation equipment or the freezing crystallization equipment is large, so that a large amount of heat can be released or absorbed in the seawater desalination process. The existing ocean heat pump realizes the transmission of a refrigerant by an internal circulation pipeline, realizes the cooling or heating of outside air by the refrigerant after heat exchange with seawater, can generate heat energy loss in the process, so the heat exchange efficiency is low, and better heating or refrigerating effect cannot be realized.
Disclosure of Invention
The following is a summary of the subject matter described in detail in this disclosure. This summary is not intended to limit the scope of the claims.
The invention provides a system for operating an ocean heat pump and a seawater desalination system, which comprises a gas transmission passage, a seawater desalination system and a heat pump system; wherein,
the heat pump system comprises a heat exchanger, the heat exchanger is used for realizing mutual heat exchange between the gas transmission passage and the seawater passage, the heat pump system forms an air heat exchange flow path, and the tail end of the air heat exchange flow path is communicated to a space to be temperature-regulated;
the gas transmission passage is used for inputting outside air into the heat exchanger for heat exchange and transmitting gas after heat exchange to the air heat exchange flow path;
the seawater passage is used for inputting seawater into the heat exchanger for heat exchange and conveying the seawater subjected to heat exchange to the seawater desalination system;
the seawater desalination system is used for desalinating the seawater subjected to heat exchange.
In some embodiments of the present disclosure, the heat pump system further comprises a compression-expansion all-in-one machine, the compression-expansion all-in-one machine being located on the gas transmission path, the compression-expansion all-in-one machine comprising a compression end and an expansion end;
the air heat exchange flow path comprises at least one heat exchange passage disposed between the compression end and the expansion end; the heat exchange passage flows through the seawater desalination system, and the seawater desalination system supplies heat or cold to the heat exchange passage.
In some embodiments of the present disclosure, the seawater desalination system comprises a multi-stage flash evaporation desalination system, the multi-stage flash evaporation desalination system comprises a multi-stage flash evaporation device, a water outlet of the seawater passage is connected with an inlet of the multi-stage flash evaporation device, and an exhaust port of the multi-stage flash evaporation device is connected with a first fresh water outlet pipe; and/or the presence of a gas in the gas,
the seawater desalination system comprises a freezing crystallization desalination system, the freezing crystallization desalination system comprises a freezing crystallization device, a water outlet of the seawater passage is connected with an inlet of the freezing crystallization device, and a discharge hole of the freezing crystallization device is connected with a second fresh water delivery pipe.
In some embodiments of the present disclosure, the at least one heat exchange passage comprises a first heat exchange passage, an inlet of the first heat exchange passage is connected to the compression end, and an outlet of the first heat exchange passage is connected to the expansion end; the first heat exchange passage flows through the multi-stage flash apparatus, and the multi-stage flash apparatus supplies cold to the first heat exchange passage; and/or the presence of a gas in the atmosphere,
the at least one heat exchange passage comprises a second heat exchange passage, an inlet of the second heat exchange passage is connected with the expansion end, and an outlet of the second heat exchange passage is connected with the compression end; the second heat exchange path flows through the freezing and crystallizing device, and heat is supplied to the second heat exchange path by the freezing and crystallizing device.
In some embodiments of the present disclosure, the system operated by the combination of the ocean heat pump and the seawater desalination system further includes:
a first switching device for switching and connecting the seawater passage between the multistage flash apparatus and the freeze crystallization apparatus;
a control device configured to: when the compression-expansion all-in-one machine is in a refrigeration mode, the control device controls the first switching device to connect the seawater passage with the multistage flash evaporation device; when the compression-expansion integrated machine is in a heating mode, the control device controls the first switching device to connect the seawater passage with the freezing and crystallizing device.
In some embodiments of the present disclosure, the system operated by the combination of the ocean heat pump and the seawater desalination system further includes:
the control device is used for controlling the first heat exchange channel to be communicated with the compression-expansion all-in-one machine when the compression-expansion all-in-one machine is in a refrigeration mode; when the compression-expansion all-in-one machine is in a heating mode, the control device controls the second switching device to communicate the second heat exchange passage with the compression-expansion all-in-one machine.
In some embodiments of the disclosure, the air heat exchange flow path further includes at least one air outlet passage, the heat pump system further includes a heat exchange branch connected to the air outlet passage, the air outlet passage is connected to the compression-expansion all-in-one machine and is used for introducing the gas processed by the compression-expansion all-in-one machine into the space to be temperature-adjusted, and the heat exchange branch is used for introducing part of the gas in the air outlet passage into the seawater desalination system to supply heat or cold to the seawater desalination system.
In some embodiments of the present disclosure, the seawater desalination system further includes a vapor compressor and a condensing device connected to each other, an inlet of the vapor compressor is connected to the exhaust port of the multistage flash evaporation device and the exhaust port of the freeze crystallization device, and an outlet of the condensing device is connected to the first fresh water outlet pipe;
the at least one heat exchange branch comprises a first heat exchange branch, one end of the first heat exchange branch is connected to the air outlet passage, and the other end of the first heat exchange branch is communicated with the condensing device so as to supply cold to the condensing device.
In some embodiments of the present disclosure, the freezing, crystallizing and desalinating system further includes a washing device and an ice melting device connected to each other, an inlet of the washing device is connected to a discharge port of the freezing and crystallizing device, and an outlet of the ice melting device is connected to the second fresh water discharge pipe;
and the at least one heat exchange branch comprises a second heat exchange branch, one end of the second heat exchange branch is connected to the air outlet passage, and the other end of the second heat exchange branch is connected with the ice melting device so as to supply heat to the ice melting device.
In some embodiments of the present disclosure, a driving mechanism is disposed on the heat exchange branch.
The system for operating the sea heat pump and the sea water desalination system has the following beneficial effects:
compared with the method for circularly transmitting the refrigerant through the internal circulation pipeline in the traditional process, the method has lower requirements on the tightness of the gas transmission channel and the air heat exchange flow path, so that the replacement and the maintenance of the pipeline are relatively simple, and the pipeline with relatively low price can be selected in the selection of the pipeline, thereby reducing the cost for replacing the corroded pipeline due to long-term indirect contact with seawater; in addition, the air after heat exchange by the seawater is transmitted into the space to be temperature-regulated through the air heat exchange flow path, so that the problem of heat energy loss generated in the heat exchange process of the air and the traditional refrigerant is solved, and the utilization efficiency of ocean heat energy is improved; on the other hand, the seawater desalination efficiency and the fresh water output rate of the seawater desalination system after heat exchange of the heat pump system can be remarkably improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the embodiments of the disclosure. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the disclosure. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
FIG. 1 is a block diagram of a system for operating a sea heat pump in conjunction with a seawater desalination system as shown in the present disclosure.
Fig. 2 is a block diagram of a heat pump system in a system for operating a sea heat pump in conjunction with a sea water desalination system as shown in the present disclosure.
Fig. 3 is a structural diagram of a heat exchange path and a compression-expansion all-in-one machine in a system in which the ocean heat pump and the seawater desalination system operate according to the disclosure.
In the figure:
100. a gas transmission path; 200. a seawater passage; 300. a seawater desalination system; 400. a heat pump system; 500. a first switching device; 600. a control device; 700. a second switching device; 800. an air heat exchange flow path; 900. a switching valve;
1. a heat exchanger; 2. a compression-expansion all-in-one machine; 201. a compression end; 202. an expansion end; 3. a heat exchange path; 301. a first heat exchange path; 302. a second heat exchange path; 4. a multi-stage flash desalination system; 401. a multi-stage flash distillation device; 5. a first fresh water delivery pipe; 6. a freezing crystallization desalination system; 601. a freezing and crystallizing device; 602. a washing device; 603. an ice melting device; 7. a second fresh water delivery pipe; 8. an air outlet passage; 9. a heat exchange branch; 901. a first heat exchange branch; 902. a second heat exchange branch; 10. a vapor compressor; 11. a condensing unit; 12. a first air pump; 13. a second air pump; 14. a degasser; 15. a first on-off valve; 16. and a second on-off valve.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. It should be noted that, in the present disclosure, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict.
The seawater desalination system has large fresh water yield, so a large amount of heat can be released or absorbed in the seawater desalination process, the heat exchange efficiency of the existing ocean heat pump technology and the seawater desalination system is low, and a good heating or refrigerating effect cannot be realized.
In order to solve the above technical problems, an exemplary embodiment of the present disclosure provides a system for operating an ocean heat pump and a seawater desalination system, in which external air cooled/heated by seawater is transmitted to a space to be temperature-regulated through an air heat exchange flow path, so as to avoid heat loss generated in a process of transmitting heat by using a refrigerant as an intermediate medium.
The system for operating the ocean heat pump and the seawater desalination system provided by the present disclosure is described in detail below with reference to the accompanying drawings.
An exemplary embodiment of the present disclosure provides a system operated by combining an ocean heat pump and a seawater desalination system, as shown in fig. 1 and combined with fig. 2, the system operated by combining an ocean heat pump and a seawater desalination system includes a gas transmission passage 100, a seawater passage 200, a seawater desalination system 300 and a heat pump system 400; the heat pump system 400 comprises a heat exchanger 1, wherein the heat exchanger 1 is used for realizing mutual heat exchange between the gas transmission passage 100 and the seawater passage 200; the heat pump system 400 forms an air heat exchange flow path 800, the tail end of the air heat exchange flow path 800 is communicated to a space to be temperature-regulated, the gas transmission path 100 is used for inputting outside air into the heat exchanger 1 for heat exchange, and transmitting gas after heat exchange to the air heat exchange flow path 800; the seawater passage 200 is used for inputting seawater into the heat exchanger 1 for heat exchange, and conveying the seawater after heat exchange to the seawater desalination system 300; the seawater desalination system 300 is used for desalinating the seawater after heat exchange.
For example, the heat pump system 400 in this embodiment may be a single cooling system, a single heating system, or a system including both a cooling mode and a heating mode.
In this embodiment, when the heat pump system 400 is in the cooling mode, the seawater passage 200 pumps seawater into the heat exchanger 1, the air transmission passage 100 pumps external air into the heat exchanger 1, the high-temperature external air realizes heat exchange with seawater with a lower temperature in the seawater passage 200 through the air transmission passage 100, the seawater absorbs heat to raise the temperature and transmits the seawater to the seawater desalination system 300, the seawater desalination rate after the heat absorption and temperature rise is significantly increased, the external air releases heat to lower the temperature and transmits the seawater to the space to be temperature-regulated after heat exchange through the air heat exchange flow path 800, and the purpose of cooling the space to be temperature-regulated is achieved. When the heat pump system 400 is in a heating mode, the seawater passage 200 extracts seawater into the heat exchanger 1, the gas transmission passage 100 extracts outside air into the heat exchanger 1, low-temperature outside air realizes heat exchange with seawater with higher temperature in the seawater passage 200 through the gas transmission passage 100, the seawater absorbs heat and cools, the seawater is transmitted into the seawater desalination system 300 to be desalinated, the outside air absorbs heat to heat, and the outside air is transmitted into a space to be temperature-regulated after heat exchange through the air heat exchange flow passage 800, so that the purpose of supplying heat to the space to be temperature-regulated is realized. Compared with a method for circularly transmitting a refrigerant through an internal circulation pipeline in the traditional process, the method has the advantages that the requirement on the sealing performance of the gas transmission passage 100 and the air heat exchange flow path 800 is low, so that the replacement and the maintenance of the pipeline are relatively simple, the pipeline with relatively low cost can be selected in the aspect of selecting the pipeline, and the cost for replacing a corroded pipeline due to long-term indirect contact with seawater is reduced; the external air cooled or heated by seawater is transmitted into the space to be temperature-regulated after heat exchange through the air heat exchange flow path 800, so that the problem of heat energy loss generated in the heat exchange process of air and a traditional refrigerant is solved, and the utilization efficiency of ocean heat energy is improved; on the other hand, the seawater desalination efficiency and the fresh water output rate of the seawater desalination system 300 after heat exchange by the heat pump system 400 can be remarkably improved.
Exemplarily, the seawater passageway 200 in the present disclosure is used for extracting seawater below 20m of the sea surface; the strong brine produced in the process of seawater desalination can be discharged into deep sea below 20m, and can also be used in salt manufacturing industry to produce sea salt. Because the temperature of the seawater below 20m of the sea surface is not affected by the surface temperature basically and can be kept stable throughout the year, the seawater extracted by the seawater passage 200 can meet the requirements of cooling and heating the external air in the gas transmission passage 100, so that the system operated by the ocean heat pump and the seawater desalination system can realize all-season operation; because the density of the strong brine produced in the seawater desalination process is higher than that of common seawater, after the seawater is discharged, the heat carried by the strong brine can be diffused to the periphery and the bottom, the strong brine can also be separated from the whole system and the seawater passage 200 along with the flowing seawater, and the influence of the seawater on the heat exchange efficiency of the outside air in the subsequent process is avoided.
In an exemplary embodiment of the present disclosure, as shown in fig. 1-2, the heat pump system 400 further includes a compression-expansion all-in-one machine 2, the compression-expansion all-in-one machine 2 is located on the gas transmission path 100, the compression-expansion all-in-one machine 2 includes a compression end 201 and an expansion end 202, the air heat exchange flow path 800 includes at least one heat exchange path 3, and the heat exchange path 3 is disposed between the compression end 201 and the expansion end 202; the heat exchange passage 3 flows through the seawater desalination system 300, and the seawater desalination system 300 supplies heat or cold to the heat exchange passage 3, specifically: when the heat pump system 400 is in the refrigeration mode, the external air in the air transmission passage 100 is input from the compression end 201, and is compressed into high-temperature and high-pressure compressed air through the compression end 201, the high-temperature and high-pressure compressed air flows through the seawater desalination system 300 through the heat exchange passage 3 to supply heat to liquid-phase seawater (described in detail later), and the evaporation efficiency of the seawater is improved, so that the efficiency of seawater desalination is improved, in addition, the temperature of the compressed air after heat exchange in the multistage flash evaporation desalination system 4 (described in detail later) is reduced, and the cooled compressed air is expanded into expanded gas with lower temperature through the expansion end 202 and is input into a space to be temperature-regulated, so that a good refrigeration effect can be realized, and in the practical operation process, the purpose of temperature regulation can be achieved by regulating the power of the compression-expansion integrated machine 2. When the heat pump system 400 is in the heating mode, the external air in the air transmission passage 100 is input from the expansion end 202, and is expanded into low-temperature and low-pressure expanded air through the expansion end 202, the low-temperature and low-pressure expanded air flows through the seawater desalination system 300 through the heat exchange passage 3 to cool the liquid-phase seawater (described later), and the crystallization efficiency of the liquid-phase seawater is improved, so that the efficiency of seawater desalination is improved.
When the heat pump system 400 is a system including a cooling mode and a heating mode, a switching valve 900 is disposed between the gas transmission path 100 and the compression-expansion integrated machine 2, when the heat pump system 400 is in the cooling mode, the switching valve 900 communicates the outlet of the gas transmission path 100 with the compression end 201 of the compression-expansion integrated machine 2, and when the heat pump system 400 is in the heating mode, the switching valve 900 switches the outlet of the gas transmission path 100 to communicate with the expansion end 202 of the compression-expansion integrated machine 2.
In an exemplary embodiment of the present disclosure, as shown in fig. 1, the seawater desalination system 300 includes a multi-stage flash evaporation desalination system 4, the multi-stage flash evaporation desalination system 4 includes a multi-stage flash evaporation device 401, a water outlet of the seawater passage 200 is connected to an inlet of the multi-stage flash evaporation device 401, and an air outlet of the multi-stage flash evaporation device 401 is connected to the first fresh water outlet pipe 5. When the heat pump system 400 is in a refrigeration mode, seawater subjected to preliminary heat exchange with the gas transmission passage 100 in the heat exchanger 1 absorbs heat energy contained in gas compressed and heated by the compression end 201 in the multistage flash evaporation device 401 subjected to negative pressure treatment, the seawater is evaporated and separated into water vapor and strong brine without external heat, the purpose of refrigerating compressed gas is achieved while the operation efficiency of the multistage flash evaporation desalination system 4 is improved, the compressed gas subjected to heat exchange is further expanded into expanded gas through the expansion end 202 and is input into a space to be temperature regulated, and the space to be temperature regulated is refrigerated; wherein, the strong brine that multistage flash distillation unit 401 produced is arranged outside to the ocean or is used for industry salt manufacturing, and after vapor condensation becomes fresh water, discharge through first fresh water eduction tube 5, through the above-mentioned heat transfer process of heat pump system 400 with multistage flash distillation desalination 4, improve sea water desalination.
The seawater desalination system 300 comprises a freezing crystallization desalination system 6, the freezing crystallization desalination system 6 comprises a freezing crystallization device 601, the water outlet of the seawater passage 200 is connected with the inlet of the freezing crystallization device 601, the discharge hole of the freezing crystallization device 601 is connected with a second fresh water outlet pipe 7, and the fresh water produced by the freezing crystallization desalination system 6 is output through the second fresh water outlet pipe 7. When the heat pump system 400 is in a heating mode, seawater performs primary heat exchange with the gas transmission passage 100 in the heat exchanger 1 and then enters the freezing and crystallizing device 601, in the freezing and crystallizing device 601 after negative pressure treatment, the seawater transmits heat energy to gas after being expanded and cooled by the expansion end 202, the temperature of the seawater is reduced and is converted into a mixture of gas, liquid and solid phases under the condition of no need of external cooling, the expanded gas after heat exchange is further compressed into compressed gas by the compression end 201 and is input into a space to be heated after being subjected to heat exchange by the air heat exchange flow path 800, the space to be heated is heated, and the ocean heat energy is utilized to the maximum degree while the operation efficiency of the freezing and crystallizing desalination system 6 is improved.
In an exemplary embodiment of the present disclosure, as shown in fig. 1, the system of the present disclosure, which operates in combination with a sea water desalination system, further includes a degasser 14; the degasser 14 is located on the seawater passage 200 and used for degassing seawater before entering the seawater desalination system 300, so that on one hand, the crystallization speed of seawater in the freezing crystallization desalination system 6 can be increased, and on the other hand, the corrosion of gas in the seawater on each device in the seawater desalination system 300 can be avoided.
In one embodiment, as shown in fig. 1 in conjunction with fig. 2, the at least one heat exchange passage 3 comprises a first heat exchange passage 301, an inlet of the first heat exchange passage 301 is connected to the compression end 201, and an outlet of the first heat exchange passage 301 is connected to the expansion end 202; the first heat exchange pass 301 passes through a multi-stage flash apparatus 401, and the multi-stage flash apparatus 401 supplies cold to the first heat exchange pass 301. When the heat pump system 400 is in the refrigeration mode, the process of the multistage flash evaporation device 401 converting seawater into vapor is a heat absorption process, so that the air supplies heat to the multistage flash evaporation device 401 through the first heat exchange passage 301 after being compressed and heated, the refrigeration of the air is realized, the expansion end 202 further realizes the refrigeration, and the purpose of whole-process air cooling by the multistage flash evaporation desalination system 4 is realized without the help of external cooling.
In one embodiment, at least one heat exchange channel 3 comprises a second heat exchange channel 302, an inlet of the second heat exchange channel 302 is connected to the expansion end 202, and an outlet of the second heat exchange channel 302 is connected to the compression end 201; the second heat exchange path 302 passes through the freeze crystallization device 601, and heat is supplied from the freeze crystallization device 601 to the second heat exchange path 302. When the heat pump system 400 is in the heating mode, the process of converting seawater crystals into a solid phase by the freezing and crystallizing device 601 is a heat release process, so that air is expanded and cooled at the expansion end 202, and then is supplied to the freezing and crystallizing device 601 through the second heat exchange passage 302, so that the air is heated, the air temperature is raised, the compression and heating are further realized by the compression end 201, and the purpose of supplying heat to the air in the whole process by the freezing and crystallizing desalination system 6 is realized without external heat.
In an exemplary embodiment of the present disclosure, as shown in fig. 1, the system for operating a sea heat pump in combination with a sea water desalination system further includes a first switching device 500 and a control device 600, wherein the first switching device 500 is used for switching and connecting the sea water passage 200 between the multistage flash evaporation device 401 and the freezing and crystallization device 601; the control apparatus 600 is configured to: when the compression-expansion all-in-one machine 2 is in a refrigeration mode, the control device 600 controls the first switching device 500 to connect the seawater passage 200 with the multistage flash evaporation device 401; when the compression-expansion all-in-one machine 2 is in a heating mode, the control device 600 controls the first switching device 500 to connect the seawater passage 200 with the freezing and crystallizing device 601; the heat pump system 400 can be automatically paired with the seawater desalination system 300 in different working modes, so that the full-season combined operation automation of the heat pump system 400 and the seawater desalination system 300 and the continuous output of fresh water are realized.
In an exemplary embodiment of the disclosure, as shown in fig. 1, the system for operating an ocean heat pump combined seawater desalination system further includes a second switching device 700, the first switching device 500 operates in cooperation with the second switching device 700, the second switching device 700 is configured to switch and connect the first heat exchange path 301 and the second heat exchange path 302 to the compression-expansion all-in-one machine 2, when the compression-expansion all-in-one machine 2 is in a refrigeration mode, the first switching device 500 connects the seawater path 200 with the multistage flash evaporation device 401, and the control device 600 controls the second switching device 700 to communicate the first heat exchange path 301 with the compression-expansion all-in-one machine 2; when the compression-expansion all-in-one machine 2 is in a heating mode, the first switching device 500 connects the seawater passage 200 with the freezing and crystallizing device 601, and the control device 600 controls the second switching device 700 to communicate the second heat exchange passage 302 with the compression-expansion all-in-one machine 2. Illustratively, as shown in fig. 3, the second switching device 700 includes a first on-off valve 15 disposed between the first heat exchange path 301 and the compression-expansion all-in-one machine 2, and a second on-off valve 16 disposed between the second heat exchange path 302 and the compression-expansion all-in-one machine 2.
In one embodiment, as shown in fig. 1, the air heat exchange flow path 800 further includes at least one air outlet passage 8, the heat pump system 400 further includes a heat exchange branch 9 connected to the air outlet passage 8, the air outlet passage 8 is connected to the compression-expansion all-in-one machine 2, and is configured to introduce the gas processed by the compression-expansion all-in-one machine 2 into the space to be temperature-adjusted, specifically, the air outlet passage 8 is communicated with the first heat exchange passage 301 and the second heat exchange passage 302, the gas in the first heat exchange passage 301 and the second heat exchange passage 302 is introduced into the space to be temperature-adjusted through the air outlet passage 8, the heat exchange branch 9 is configured to introduce part of the gas in the air outlet passage 8 into the seawater desalination system 300 to supply heat or cool to the seawater desalination system 300, and in a negative pressure state, condensation of the water vapor in the multistage flash evaporation desalination system 4 or melting of ice crystals in the freezing and crystallization desalination system 6 can be realized only by a small amount of cold or heat, and a small amount of gas is introduced into the multistage flash evaporation desalination system 4 and the freezing crystallization desalination system 6, so that the temperature adjusting effect of a space to be adjusted in temperature cannot be influenced, the condensing and melting speeds can be increased, and the operating efficiency of the multistage flash evaporation desalination system 4 and the freezing crystallization desalination system 6 is improved.
In an embodiment, as shown in fig. 1, the seawater desalination system 300 further includes a vapor compressor 10 and a condensing unit 11 connected in sequence, an inlet of the vapor compressor 10 is connected to an exhaust port of the multistage flash evaporation apparatus 401 and an exhaust port of the freeze crystallization apparatus 601, and an outlet of the condensing unit 11 is connected to the first fresh water outlet pipe 5; the at least one heat exchange branch 9 includes a first heat exchange branch 901, one end of the first heat exchange branch 901 is connected to the air outlet passage 8, and the other end of the first heat exchange branch 901 is communicated with the condensing device 11 to supply cold to the condensing device 11. After the multistage flash evaporation device 401 is heated by the first heat exchange passage 301, water vapor formed by evaporation is transmitted to the vapor compressor 10, part of the water vapor is compressed into liquid water by the vapor compressor 10, the rest water vapor is transmitted to the condensing device 11 along with the liquid water, and under the action of low-temperature air introduced by the first heat exchange branch 901, the high-efficiency fresh water output of the multistage flash evaporation device 401 is realized without the help of external heat; on the other hand, in the case that the second heat exchange path 302 is used for cooling, the freezing and crystallizing device 601 also generates a part of water vapor in the crystallizing process, and similarly, the water vapor generated by the freezing and crystallizing device 601 is injected into the vapor compressor 10 and then is partially liquefied, and since the outside temperature is low in the heating mode, the remaining water vapor can be condensed into fresh water at normal temperature, thereby achieving the effect of improving the yield of fresh water.
In an exemplary embodiment of the present disclosure, as shown in fig. 1, the freezing and desalting system 6 further includes a washing device 602 and an ice melting device 603 connected to each other, an inlet of the washing device 602 is connected to a discharge port of the freezing and crystallizing device 601, and an outlet of the ice melting device 603 is connected to the second fresh water outlet pipe 7; the at least one heat exchange branch 9 comprises a second heat exchange branch 902, one end of the second heat exchange branch 902 is connected to the air outlet passage 8, the other end is connected to the ice melting device 603, so as to supply heat to the ice melting device 603, in the freezing and crystallizing device 601 after negative pressure treatment, the liquid seawater is converted into a mixture of ice crystals with lower salt content and strong brine with higher salt content, the mixture is injected into a washing device 602, concentrated brine is discharged through the washing device 602, salt attached to the surfaces of solid-phase ice crystals is washed and removed, ice crystals with low salt content and ice slurry formed by washing water are transmitted into an ice melting device 603, the ice melting device 603 is supplied with heat by the air in the second heat exchange branch 902, the solid-phase ice crystals are heated and melted into liquid-phase fresh water, and the liquid-phase fresh water is output and collected by the second fresh water delivery pipe 7 without external heat, the ice crystals can be melted and converted into fresh water, and the effect of improving the heat energy conversion efficiency of the system is achieved.
In an exemplary embodiment of the present disclosure, as shown in fig. 1-2, a driving mechanism is disposed on the heat exchange branch 9, specifically, the first heat exchange branch 901 and the second heat exchange branch 902 are respectively driven by the first air pump 12 and the second air pump 13, and the first air pump 12 and the second air pump 13 increase the transfer speed of the air after heat exchange in the first heat exchange branch 901 and the second heat exchange branch 902, so as to increase the heat exchange effect of the air on the condensing device 11 and the ice melting device 603, and thereby improve the seawater desalination efficiency.
For example, as shown in fig. 1-2, the start and stop of the first air pump 12 and the second air pump 13 are controlled by the control device 600, in the heating mode, the first air pump 12 is always in a standby state, and the second air pump 13 is in a working state; in the cooling mode, the first air pump 12 is in an operating state, and the second air pump 13 is in a standby state.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In the description herein, references to the terms "embodiment," "exemplary embodiment," "some embodiments," "illustrative embodiments," "example" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure.
In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing and simplifying the present disclosure, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure.
It will be understood that the terms "first," "second," and the like as used in this disclosure may be used in the present disclosure to describe various structures, but these structures are not limited by these terms. These terms are only used to distinguish one structure from another.
Like elements in one or more of the drawings are referred to by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, certain well known components may not be shown. For the sake of simplicity, the structure obtained after several steps can be described in one figure. Numerous specific details of the present disclosure, such as structures, materials, dimensions, processing techniques and techniques of the devices, are set forth in the following description in order to provide a more thorough understanding of the present disclosure. However, as will be understood by those skilled in the art, the present disclosure may be practiced without these specific details.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; while the present disclosure has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the embodiments of the present disclosure by the essence of the corresponding technical solutions.
Claims (10)
1. A system for operating an ocean heat pump and a seawater desalination system is characterized by comprising a gas transmission passage (100), a seawater passage (200), a seawater desalination system (300) and a heat pump system (400); wherein,
the heat pump system (400) comprises a heat exchanger (1), the heat exchanger (1) is used for realizing mutual heat exchange between the gas transmission passage (100) and the seawater passage (200), the heat pump system (400) forms an air heat exchange flow path (800), and the tail end of the air heat exchange flow path (800) is communicated to a space to be temperature-regulated;
the gas transmission passage (100) is used for inputting outside air into the heat exchanger (1) for heat exchange and transmitting gas after heat exchange to the air heat exchange flow path (800);
the seawater passage (200) is used for inputting seawater into the heat exchanger (1) for heat exchange and conveying the seawater subjected to heat exchange to the seawater desalination system (300);
the seawater desalination system (300) is used for desalinating the seawater subjected to heat exchange.
2. The system of claim 1, wherein the heat pump system is configured to operate in conjunction with a desalination system,
the heat pump system (400) further comprises a compression-expansion all-in-one machine (2), the compression-expansion all-in-one machine (2) is located on the gas transmission passage (100), and the compression-expansion all-in-one machine (2) comprises a compression end (201) and an expansion end (202);
the air heat exchange flow path (800) comprises at least one heat exchange passage (3), the heat exchange passage (3) being disposed between the compression end (201) and the expansion end (202); the heat exchange passage (3) flows through the seawater desalination system (300), and the seawater desalination system (300) supplies heat or cold to the heat exchange passage (3).
3. The system operating in combination with a sea water desalination system as claimed in claim 2, wherein the sea water desalination system (300) comprises a multistage flash desalination system (4), the multistage flash desalination system (4) comprises a multistage flash evaporation device (401), a water outlet of the sea water passage (200) is connected to an inlet of the multistage flash evaporation device (401), and an air outlet of the multistage flash evaporation device (401) is connected to the first fresh water outlet pipe (5); and/or the presence of a gas in the gas,
the seawater desalination system (300) comprises a freezing crystallization desalination system (6), the freezing crystallization desalination system (6) comprises a freezing crystallization device (601), a water outlet of the seawater passage (200) is connected with an inlet of the freezing crystallization device (601), and a discharge hole of the freezing crystallization device (601) is connected with a second fresh water outlet pipe (7).
4. A system according to claim 3, wherein the at least one heat exchange path (3) comprises a first heat exchange path (301), wherein an inlet of the first heat exchange path (301) is connected to the compression side (201), and an outlet of the first heat exchange path (301) is connected to the expansion side (202); said first heat exchange pass (301) passes through said multi-stage flash apparatus (401), cooling being supplied to said first heat exchange pass (301) by said multi-stage flash apparatus (401); and/or the presence of a gas in the gas,
the at least one heat exchange passage (3) comprises a second heat exchange passage (302), the inlet of the second heat exchange passage (302) is connected with the expansion end (202), and the outlet of the second heat exchange passage (302) is connected with the compression end (201); the second heat exchange passage (302) flows through the freezing and crystallizing device (601), and heat is supplied to the second heat exchange passage (302) by the freezing and crystallizing device (601).
5. The system of claim 4, wherein the system further comprises:
a first switching device (500), wherein the first switching device (500) is used for switching and connecting the seawater passage (200) between the multistage flash evaporation device (401) and the freezing and crystallizing device (601);
a control apparatus (600), the control apparatus (600) configured to: when the compression-expansion all-in-one machine (2) is in a refrigeration mode, the control device (600) controls the first switching device (500) to connect the seawater passage (200) with the multistage flash device (401); when the compression-expansion integrated machine (2) is in a heating mode, the control device (600) controls the first switching device (500) to connect the seawater passage (200) with the freezing and crystallizing device (601).
6. The system of claim 5, wherein the system further comprises:
a second switching device (700), wherein the second switching device (700) is used for switching and connecting the first heat exchange path (301) and the second heat exchange path (302) to the compression-expansion all-in-one machine (2), and when the compression-expansion all-in-one machine (2) is in a refrigeration mode, the control device (600) controls the second switching device (700) to communicate the first heat exchange path (301) with the compression-expansion all-in-one machine (2); when the compression-expansion integrated machine (2) is in a heating mode, the control device (600) controls the second switching device (700) to communicate the second heat exchange passage (302) with the compression-expansion integrated machine (2).
7. The system operating by combining the ocean heat pump and the seawater desalination system as claimed in claim 3, wherein the air heat exchange flow path (800) further comprises at least one air outlet passage (8), the heat pump system (400) further comprises a heat exchange branch (9) connected with the air outlet passage (8), the air outlet passage (8) is connected with the compression-expansion all-in-one machine (2) and is used for introducing the gas treated by the compression-expansion all-in-one machine (2) into the space to be temperature-regulated, and the heat exchange branch (9) is used for introducing part of the gas in the air outlet passage (8) into the seawater desalination system (300) so as to supply heat or cold to the seawater desalination system (300).
8. The system of claim 7, wherein the seawater desalination system (300) further comprises a vapor compressor (10) and a condenser (11) connected to each other, wherein an inlet of the vapor compressor (10) is connected to an exhaust of the multistage flash evaporation device (401) and an exhaust of the freeze crystallization device (601), and an outlet of the condenser (11) is connected to the first fresh water outlet pipe (5);
the at least one heat exchange branch (9) comprises a first heat exchange branch (901), one end of the first heat exchange branch (901) is connected to the air outlet passage (8), and the other end of the first heat exchange branch (901) is communicated with the condensing device (11) to supply cold to the condensing device (11).
9. The system operating in combination with the sea water desalination system of claim 7, wherein the freezing and crystallization desalination system (6) further comprises a washing device (602) and an ice melting device (603) connected with each other, wherein an inlet of the washing device (602) is connected with a discharge port of the freezing and crystallization device (601), and an outlet of the ice melting device (603) is connected with the second fresh water outlet pipe (7);
the at least one heat exchange branch (9) comprises a second heat exchange branch (902), one end of the second heat exchange branch (902) is connected to the air outlet passage (8), and the other end of the second heat exchange branch is connected with the ice melting device (603) to supply heat to the ice melting device (603).
10. The system of claim 8 or 9, wherein the heat exchange branch (9) is provided with a driving mechanism.
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