Energy storage type wind / solar driven ejector heat pump membrane thermal coupling seawater desalination system

Abstract

The application discloses an energy storage type wind / solar driven jet heat pump membrane heat coupling seawater desalination system, and relates to the technical field of seawater desalination driven by a wind power transmitter, which comprises a wind direct drive reverse osmosis unit, a seawater desalination unit and a jet unit, the seawater desalination unit comprises a regenerator, a heater, a flash evaporator, a fresh water condenser, a first-stage fresh water tank and a second-stage fresh water tank, wherein the first-stage fresh water tank is used for storing fresh water treated by the reverse osmosis unit, and the regenerator is used for preliminarily heating seawater discharged from the reverse osmosis unit; the heater is used for further heating seawater discharged from the regenerator; the flash evaporator is used for flash evaporating seawater discharged from the heater to generate water vapor, part of heat of the water vapor is recovered by the regenerator, and the other part of heat is used for heating seawater, and the part of water vapor used for heating seawater is condensed into liquid water by the fresh water condenser and then enters the second-stage fresh water tank to be stored. The application has the advantages of simple structure, remarkable energy-saving effect, convenient control and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of driving seawater desalination by wind power transmitter, and particularly relates to a storage type wind power / solar power driven jet heat pump membrane heat coupling seawater desalination system. BACKGROUND

[0002] Water is the source of life for civilization and the material foundation for social development. However, with the rapid development of social economy, problems such as water shortage, river and lake pollution, and water ecological deterioration have emerged, and water resources are no longer a natural resource that can be taken without limit. Freshwater resources are even more so. With the rapid development of social economy, freshwater resource shortage has become a global problem, and more and more countries and regions are facing freshwater crisis. Seawater desalination is one of the important ways to solve the problem of freshwater resource shortage and has attracted widespread attention. Seawater desalination technology mainly includes reverse osmosis method and distillation method. In 2020, the installed capacity of wind power in China was about 280GW, accounting for 38.45% of the global capacity. From 2009 to 2020, the annual average growth rate of wind power in China was 29.3%. In 2016-2020, the wind power generation capacity of 240.9TWh, 304.6TWh, 355.3TWh, 405.7TWh and 466.5TWh respectively ranked first in the world. With the continuous increase of wind power grid-connected capacity, its volatility and anti-peaking characteristics seriously hinder the process of consumption. Large-scale wind power transmission and the increase of peak shaving units have alleviated the predicament. However, this has brought more security risks to the power grid. The large-scale development of wind power has caused serious new energy power consumption problems.

[0003] Using wind energy as power for seawater desalination can realize on-site consumption of wind resources and production of freshwater resources. The membrane heat coupling seawater technology driven by wind power is an integrated technology that organically combines membrane and heat seawater desalination technologies, and uses solar energy to solve the instability and intermittency of wind energy. By optimizing the process system and reasonably configuring resources, the water production cost of seawater desalination is reduced, so as to obtain higher economy. The membrane heat coupling seawater desalination technology is the most advanced technology in the field of seawater desalination at present, and is the main direction of future seawater desalination research. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a storage type wind power / solar power driven jet heat pump membrane heat coupling seawater desalination system, which uses various low-grade heat energy to obtain freshwater resources, such as wind energy, solar energy and other energy. Through the coupling integration of the wind power driven reverse osmosis unit, the seawater desalination unit and the jet unit, efficient utilization, conversion and on-site consumption of wind energy are realized.

[0005] To achieve the above-mentioned purposes, the present application can adopt the following technical solutions:

[0006] An energy storage type wind / solar driven ejector heat pump membrane thermal coupling seawater desalination system, comprising:

[0007] A wind direct drive reverse osmosis unit, which uses wind energy to extract seawater into the reverse osmosis unit;

[0008] A seawater desalination unit, comprising a regenerator, a heater, a flash evaporator, a fresh water condenser, a first fresh water tank and a second fresh water tank, wherein the first fresh water tank is used to store fresh water treated by the reverse osmosis unit, the regenerator is used to preliminarily heat seawater discharged from the reverse osmosis unit; the heater is used to further heat seawater discharged from the regenerator; the flash evaporator is used to flash evaporate seawater discharged from the heater to generate water vapor, a part of the heat of the water vapor is recovered by the regenerator, and another part of the heat of the water vapor is used to heat seawater, and the part of the water vapor used to heat seawater is condensed into liquid water by the fresh water condenser and stored in the second fresh water tank; and,

[0009] An ejector unit provided with a condenser coupled with the heater, and the heater absorbs heat generated by the condenser.

[0010] The seawater desalination system as described above, further comprising: a pressure recovery device arranged downstream of the reverse osmosis unit, for recovering the pressure of seawater.

[0011] The seawater desalination system as described above, further comprising: an ejector, a condenser / evaporator, and a heat collecting evaporator, the ejector, the condenser, and the condenser / evaporator are sequentially closed looped to form a first pipeline, and the ejector, the condenser, and the heat collecting evaporator are sequentially closed looped to form a second pipeline, wherein,

[0012] The working medium in the first pipeline completes a low-temperature evaporation process through the condenser / evaporator to form an ejecting fluid.

[0013] The working medium in the second pipeline completes a high-temperature evaporation process through the heat collecting evaporator to form a working fluid.

[0014] The seawater desalination system as described above, further comprising: a booster pipeline, the booster pipeline comprising a low-pressure expansion valve, an evaporator, a compressor, and the condenser / evaporator, the low-pressure expansion valve, the evaporator, the compressor, and the condenser / evaporator are sequentially closed looped to form the booster pipeline;

[0015] The first pipeline further comprises a high-pressure expansion valve, and the high-pressure expansion valve is arranged between the condenser and the condenser / evaporator, wherein,

[0016] The organic working medium of the condenser outlet is divided into two paths, one path passes through the high-pressure expansion valve to reduce pressure and enters the condenser / evaporator, absorbs the heat of the organic working medium discharged by the compressor to complete the low-temperature evaporation process; the other path passes through the booster pump to enter the heat collecting evaporator, absorbs the heat of the heat source to complete the high-temperature evaporation process.

[0017] The seawater desalination system as described above, further, the working medium of the booster pipeline transfers heat to the working medium of the first pipeline in the condenser / evaporator to complete the condensation process, then enters the evaporator through the pressure reduction of the matched low-pressure expansion valve, the working medium absorbs the heat in the air in the evaporator to complete the evaporation process, and finally enters the compressor to complete the booster cycle.

[0018] The seawater desalination system as described above, further, the heat source includes industrial waste heat, solar energy, biomass energy, geothermal energy or ocean temperature difference energy.

[0019] The seawater desalination system as described above, further, the residual pressure of the seawater recovered by the residual pressure recovery device is output as mechanical energy through the power output shaft, so as to drive the compressor and the booster pump.

[0020] The seawater desalination system as described above, further, the wind-driven reverse osmosis unit further comprises: a wind wheel, which is used to generate mechanical energy by relying on wind power.

[0021] The seawater desalination system as described above, further, the wind-driven reverse osmosis unit further comprises: a high-pressure pump, the mechanical energy generated by the wind wheel drives the high-pressure pump to draw seawater into the reverse osmosis unit through coaxial connection.

[0022] The seawater desalination system as described above, further, the wind-driven reverse osmosis unit further comprises: an energy storage device, when seawater desalination is not performed, the mechanical energy generated by the wind wheel is connected to the energy storage device, and the energy storage device is used to store energy.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The present application adopts wind-driven high-pressure pump and auxiliary solar energy to perform seawater desalination, can realize efficient conversion and consumption of wind resources, and utilizes solar energy to enhance the stability of the system.

[0025] 2. The present application utilizes the energy recovered by the reverse osmosis system and the energy storage device to drive the ejector heat pump system, realizes efficient utilization of energy in stages.

[0026] 3. The system has good adaptability for the strong demand for fresh water in island areas. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed in the embodiments will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0028] Figure 1 Structure schematic diagram of the energy storage type wind / solar driven ejector heat pump membrane thermal coupling seawater desalination system.

[0029] The figure reference: 1, wind wheel; 2, high pressure pump; 3, energy storage device; 4, reverse osmosis unit; 5, primary fresh water tank; 6, pressure recovery device; 7, power output shaft; 8, regenerator; 9, heater; 10, flash evaporator; 11, fresh water condenser; 12, secondary fresh water tank; 13, condenser; 14, high pressure expansion valve; 15, condenser / evaporator; 16, low pressure expansion valve; 17, evaporator; 18, compressor; 19, booster pump; 20, heat collecting evaporator; 21, ejector. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0031] Embodiment:

[0032] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described accompanying drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited. In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Referring to Figure 1 The present application utilizes a plurality of low-grade heat energy to strive for fresh water resources, low-grade heat energy such as wind energy, solar energy and other energy, through the coupling integration of wind-driven reverse osmosis unit, seawater desalination unit and ejector unit, to realize the efficient utilization, conversion and on-site consumption of wind energy.

[0035] An energy storage type wind / solar driven ejector heat pump membrane thermal coupling seawater desalination system, comprising: a wind-driven reverse osmosis unit 4, a seawater desalination unit and an ejector unit, the wind-driven reverse osmosis unit 4 uses wind energy to draw seawater into the reverse osmosis unit 4. The seawater desalination unit comprises a regenerator 8, a heater 9, a flash evaporator 10, a fresh water condenser 11, a primary fresh water tank 5 and a secondary fresh water tank 12, wherein the primary fresh water tank 5 is used to store fresh water treated by the reverse osmosis unit 4, the regenerator 8 is used to preliminarily heat seawater discharged from the reverse osmosis unit 4; the heater 9 is used to further heat seawater discharged from the regenerator 8; the flash evaporator 10 is used to flash evaporate seawater discharged from the heater 9 to generate water vapor, part of the heat of the water vapor is recovered by the regenerator 8, and the other part of the heat is used to heat seawater, the part of the water vapor used to heat seawater is condensed into liquid water by the fresh water condenser 11 and enters the secondary fresh water tank 12 for storage; and the ejector unit is provided with a condenser 13 coupled with the heater 9, and the heater 9 absorbs heat generated by the condenser 13.

[0036] As an optional embodiment, in some embodiments, further comprising: a residual pressure recovery device 6, which is arranged downstream of the reverse osmosis unit 4 and is used to recover the residual pressure of seawater.

[0037] As an optional embodiment, in some embodiments, the ejector unit further comprises: an ejector 21, a condenser / evaporator 15 and a heat collecting evaporator 20, the ejector 21, the condenser 13 and the condenser / evaporator 15 are sequentially closed-loop formed into a first pipeline, and the ejector 21, the condenser 13 and the heat collecting evaporator 20 are sequentially closed-loop formed into a second pipeline, wherein,

[0038] The working medium in the first pipeline completes a low-temperature evaporation process through the condenser / evaporator 15 to form an ejecting fluid;

[0039] The working medium in the second pipeline completes a high-temperature evaporation process through the heat-collecting evaporator 20 to form a working fluid.

[0040] As an optional embodiment, in some embodiments, further comprising: a pressurization pipeline comprising a low-pressure expansion valve 16, an evaporator 17, a compressor 18 and the condenser / evaporator 15, which are sequentially closed-loop formed into the pressurization pipeline;

[0041] The first pipeline further comprises a high-pressure expansion valve 14, which is arranged between the condenser 13 and the condenser / evaporator 15.

[0042] The organic working medium at the outlet of the condenser 13 is divided into two routes, one of which enters the condenser / evaporator 15 after being depressurized by the high-pressure expansion valve 14, and completes the low-temperature evaporation process by absorbing the heat of the organic working medium discharged by the compressor 18 in the condenser / evaporator 15; the other route enters the heat-collecting evaporator 20 through the pressurization pump 19, and completes the high-temperature evaporation process by absorbing the heat of the heat source in the heat-collecting evaporator 20.

[0043] As an optional embodiment, in some embodiments, the working medium in the pressurization pipeline transfers heat to the working medium in the first pipeline in the condenser / evaporator 15 to complete a condensation process, then enters the evaporator 17 after being depressurized by the low-pressure expansion valve 16, and finally enters the compressor 18 to complete a pressurization cycle.

[0044] As an optional embodiment, in some embodiments, the heat source comprises industrial waste heat, solar energy, biomass energy, geothermal energy or ocean temperature difference energy.

[0045] As an optional embodiment, in some embodiments, the residual pressure of the seawater recovered by the residual pressure recovery device 6 is output as mechanical energy through the power output shaft 7 to drive the compressor 18 and the pressurization pump 19.

[0046] As an optional embodiment, in some embodiments, the wind-driven reverse osmosis unit 4 further comprises a wind wheel 1 for generating mechanical energy by relying on wind power.

[0047] As an optional embodiment, in some embodiments, the wind-driven direct reverse osmosis unit 4 further comprises a high-pressure pump 2, the mechanical energy generated by the wind wheel 1 drives the high-pressure pump 2 to draw seawater into the reverse osmosis unit 4 through coaxial connection.

[0048] As an optional embodiment, in some embodiments, the wind-driven direct reverse osmosis unit 4 further comprises an energy storage device 3, when not carrying out seawater desalination, the mechanical energy generated by the wind wheel 1 is connected to the energy storage device 3, and the energy storage device 3 is used to store energy.

[0049] In a complete embodiment, the working process is as follows: the mechanical energy generated by the wind wheel 1 drives the high-pressure pump 2 to draw seawater into the reverse osmosis unit 4 through coaxial connection, when not carrying out seawater desalination, the mechanical energy generated by the wind wheel 1 is connected to the energy storage device 3, and the energy storage device 3 is used to store energy. The fresh water obtained by the reverse osmosis unit 4 enters the first fresh water tank 5, the concentrated seawater discharged from the reverse osmosis unit 4 enters the pressure recovery device 6, the residual pressure of the concentrated seawater is recovered, and the mechanical energy is output through the power output shaft 7 to drive the compressor 18 and the booster pump 19. The concentrated seawater discharged from the waste heat recovery device enters the regenerator 8, recovers the heat of the high-temperature water vapor discharged from the flash evaporator 10, and then enters the heater 9, further absorbs the heat of the hot water produced by the condenser 13, and becomes high-temperature and high-pressure concentrated seawater in the flash evaporator 10. The water vapor flashed out heats the concentrated seawater discharged from the waste heat recovery device and then enters the fresh water condenser 11 to be condensed into liquid water and enters the second fresh water tank 12. The high-temperature and high-pressure organic working medium at the outlet of the ejector 21 produces heat in the condenser 13 to heat the concentrated seawater, and the organic working medium at the outlet of the condenser 13 is divided into two paths, one path passes through the high-pressure expansion valve 14 to reduce the pressure and then enters the condenser / evaporator 15, absorbs the heat of the high-temperature and high-pressure organic working medium discharged from the compressor 18 in the condenser / evaporator 15 to complete the low-temperature evaporation process; the other path enters the solar heat evaporator 20 through the booster pump 19, absorbs the heat of solar energy in the solar heat evaporator 20 to complete the high-temperature evaporation process. The organic working medium pressurized by the compressor 18 enters the condenser / evaporator 15, transfers heat to the organic working medium at the outlet of the high-pressure expansion valve 14 to complete the condensation process, and then enters the evaporator 17 through the pressure reduction of the low-pressure expansion valve 16, absorbs the heat in the air to complete the evaporation process, and finally enters the compressor 18 to complete the heat pump cycle. The high-temperature and high-pressure gaseous organic working medium produced by the solar heat evaporator 20 acts as a working fluid to enter the ejector 21 to inject the organic working medium at the outlet of the condenser / evaporator 15, and then enters the condenser 13 after mixing to provide heat source for the seawater desalination system, and complete the organic working medium cycle. The system has the advantages of simple structure, significant energy-saving effect, convenient control, etc.

[0050] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0051] The above embodiments are only for the purpose of illustrating the technical concepts and characteristics of the present application, and the purpose is to enable those of ordinary skill in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the essence of the present application should be covered within the protection scope of the present application.

Claims

1. A storage-type wind / solar-driven jet heat pump membrane thermal coupling seawater desalination system, characterized in that, include: The wind-powered direct-drive reverse osmosis unit uses wind energy to draw seawater into the reverse osmosis unit. A seawater desalination unit includes a regenerator, a heater, a flash evaporator, a freshwater condenser, a primary freshwater tank, and a secondary freshwater tank. The primary freshwater tank stores freshwater treated by the reverse osmosis unit. The regenerator initially heats the seawater discharged from the reverse osmosis unit. The heater further heats the seawater discharged from the regenerator. The flash evaporator flashes the seawater discharged from the heater to generate steam. A portion of the heat from this steam is recovered by the regenerator, and the remaining heat is used to heat the seawater. The portion of steam used for heating the seawater is condensed into liquid water by the freshwater condenser and stored in the secondary freshwater tank. The injection unit is equipped with a condenser coupled to the heater, the heater absorbing the heat generated by the condenser; The injection unit further includes: an ejector, a condenser / evaporator, and a heat-collecting evaporator. The ejector, the condenser, and the condenser / evaporator form a first pipe in a closed loop in sequence, and the ejector, the condenser, and the heat-collecting evaporator form a second pipe in a closed loop in sequence. The working medium is in the first pipe, where it completes a low-temperature evaporation process through the condenser / evaporator to form an ejector fluid; the working medium is in the second pipe, where it completes a high-temperature evaporation process through the heat-collecting evaporator to form a working fluid. It also includes a pressurization pipeline, which comprises a low-pressure expansion valve, an evaporator, a compressor, and the condenser / evaporator. The low-pressure expansion valve, the evaporator, the compressor, and the condenser / evaporator form the pressurization pipeline in a closed loop. The first pipeline also includes a high-pressure expansion valve, which is located between the condenser and the condenser / evaporator. The organic working fluid at the outlet of the condenser is divided into two paths. One path is depressurized by the high-pressure expansion valve and enters the condenser / evaporator, where it absorbs the heat from the organic working fluid discharged by the compressor to complete the low-temperature evaporation process. The other path is boosted by a pump and enters the heat-collecting evaporator, where it absorbs heat from the heat source to complete the high-temperature evaporation process.

2. The seawater desalination system according to claim 1, characterized in that, Also includes: A residual pressure recovery device is located downstream of the reverse osmosis unit and is used to recover residual pressure from seawater.

3. The seawater desalination system according to claim 1, characterized in that, In the pressurization pipeline, the working medium transfers heat to the working medium in the first pipeline in the condenser / evaporator to complete the condensation process. Then, after passing through the pressure reduction action of the low-pressure expansion valve, it enters the evaporator. In the evaporator, the working medium absorbs heat from the air to complete the evaporation process. Finally, it enters the compressor to complete the pressurization cycle.

4. The seawater desalination system according to claim 3, characterized in that, The heat source includes industrial waste heat, solar energy, biomass energy, geothermal energy, or ocean thermal energy conversion.

5. The seawater desalination system according to claim 2, characterized in that, The residual pressure of the seawater recovered by the residual pressure recovery device is output as mechanical energy through the power output shaft, thereby driving the compressor and booster pump.

6. The seawater desalination system according to claim 1, characterized in that, The wind-driven direct-drive reverse osmosis unit also includes a wind turbine, which is used to generate mechanical energy by relying on wind power.

7. The seawater desalination system according to claim 6, characterized in that, The wind-driven direct-drive reverse osmosis unit also includes a high-pressure pump, wherein the mechanical energy generated by the wind turbine drives the high-pressure pump to draw seawater into the reverse osmosis unit via a coaxial connection.

8. The seawater desalination system according to claim 7, characterized in that, The wind-driven direct-drive reverse osmosis unit also includes an energy storage device. When seawater desalination is not performed, the mechanical energy generated by the wind turbine is connected to the energy storage device, which is used to store energy.

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