CN114249368A - Zero-carbon green seawater desalination system, seawater desalination method and application - Google Patents
Zero-carbon green seawater desalination system, seawater desalination method and application Download PDFInfo
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- 238000010612 desalination reaction Methods 0.000 title claims abstract description 89
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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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- 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
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- Y02A20/124—Water desalination
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Abstract
The invention discloses a zero-carbon green seawater desalination system, which comprises an mvr seawater desalination device, a water supply device and a water supply device, wherein the seawater desalination device is used for sucking seawater and discharging strong brine and fresh water with increased temperature; the condensation-evaporator is used for collecting heat energy of strong brine and fresh water and reducing the temperature of the heat energy, and the system working medium absorbs the heat energy and exhaust gas heat energy generated by the Rankine cycle turbogenerator system to generate low-temperature steam and send the low-temperature steam to the temperature changing device; the temperature changing device is used for converting low-temperature steam into high-temperature steam; the Rankine cycle steam turbine generator system is used for converting the heat energy of the high-temperature steam into electric energy to be supplied to mvr seawater desalination devices, the surplus electric energy is conveyed outwards, exhaust gas is condensed by a condenser-evaporator to form low-temperature liquid, and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature high-pressure steam. The invention also discloses a method and application. The invention takes the residual heat in mvr as an energy source without any pollution and emission.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a zero-carbon green seawater desalination system, a seawater desalination method and application.
Background
The liquid separation by adopting the distillation method is the oldest and very widely applied, along with the requirement of social development, human beings have stronger application requirements on the distillation method due to large evaporation capacity, particularly the shortage of fresh water resources, which seriously hinders people all over the world from moving to the step of more beautiful life, the distillation method is developed for several generations, particularly, the efficiency of mvr seawater desalination devices is greatly improved, and large-scale production can be carried out, but the cost is high due to high energy consumption level, and the mvr seawater desalination devices cannot be applied to seawater desalination on a large scale to meet the increasingly developed requirements of human beings. Energy and water sources are the most basic resource requirements for human development, and after the energy problem is solved, the basis for solving other problems is only provided for well solving the water source problem.
Disclosure of Invention
In view of one or more of the problems of the prior art, according to one aspect of the present invention, there is provided a zero-carbon green seawater desalination system, comprising mvr a seawater desalination apparatus, a condenser-evaporator, a temperature varying apparatus, a rankine cycle turbine generator system;
the mvr sea water desalination device is used for sucking sea water and discharging strong brine and fresh water after the temperature is raised;
the condensation-evaporator is used for collecting mvr heat energy in the strong brine and the fresh water discharged by the seawater desalination device and reducing the temperature of the strong brine and the fresh water, a system working medium is configured in the condensation-evaporator, the heat energy in the strong brine and the fresh water discharged by the seawater desalination device mvr and exhaust gas heat energy generated by a Rankine cycle turbogenerator system are absorbed, and low-temperature steam is generated and is conveyed to the temperature changing device;
the temperature changing device is used for converting low-temperature steam generated by the condenser-evaporator into high-temperature steam;
the Rankine cycle steam turbine generator system is used for converting the heat energy of the high-temperature high-pressure steam generated by the temperature changing device into electric energy, supplying the electric energy to mvr seawater desalination devices for use, and outwards conveying redundant electric energy, exhaust gas generated by the Rankine cycle steam turbine generator system is condensed by a condenser-evaporator to form low-temperature liquid, and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature high-pressure steam.
Optionally, the rankine cycle turbogenerator system comprises a liquid pressurizing pump, a steam turbine and a generator, wherein a low-pressure end of the liquid pressurizing pump is communicated with the condenser-evaporator, a high-pressure end of the liquid pressurizing pump is communicated with a low-temperature inlet end of a temperature changing device, a low-temperature outlet end of the temperature changing device is communicated with the steam turbine, and the steam turbine is communicated with the generator.
Optionally, the temperature varying device includes a heat exchanger mechanism and a blower, the heat exchange mechanism has a low-pressure loop and a high-pressure loop, an inlet end of the blower is communicated with the low-pressure loop of the heat exchange mechanism, and an outlet end of the blower is communicated with the high-pressure loop of the heat exchange mechanism.
Optionally, the heat exchange mechanism comprises a first heat exchanger, a recuperative heat exchanger and a second heat exchanger, the recuperative heat exchanger, the second heat exchanger and the blower are connected in series in sequence, and the first heat exchanger is connected in parallel with the second heat exchanger.
Optionally, the temperature varying device further comprises a temperature regulating valve, which is configured in the high-pressure loop of the temperature varying device and is used for controlling the flow distribution of the high-temperature and high-pressure steam output by the blower between the first heat exchanger and the second heat exchanger, so as to control the temperature range of the high-temperature steam output by the first heat exchanger.
Optionally, the heat exchange mechanism further comprises a third heat exchanger for increasing the temperature difference between the high-pressure circuit and the low-pressure circuit at the high-temperature end of the second heat exchanger.
Optionally, the blower and/or the first heat exchanger and/or the second heat exchanger and/or the third heat exchanger are provided with an insulation layer.
According to another aspect of the present invention, there is provided a method for desalinating seawater by using the zero-carbon green seawater desalination system, comprising:
sucking seawater through an mvr seawater desalination device, and discharging concentrated salt water and fresh water with increased temperature;
the heat energy in the strong brine and the fresh water discharged by the Mvr seawater desalination device is collected through a condenser-evaporator, the temperature of the strong brine and the temperature of the fresh water are reduced, the system working medium absorbs the heat energy, and low-temperature steam is generated and conveyed to the temperature changing device;
converting low-temperature steam generated by the condenser-evaporator into high-temperature steam by a temperature changing device;
converting the heat energy part of the high-temperature steam generated by the temperature changing device into electric energy through a Rankine cycle turbine generator system, supplying the electric energy to mvr seawater desalination devices for use, and transmitting the redundant electric energy outwards;
exhaust gas generated by the Rankine cycle steam turbine generator system is condensed by a condenser-evaporator, low-temperature liquid is formed after heat transfer, and system working media in condensation of the condenser-evaporator absorb the heat to generate low-temperature steam which is sent to a temperature changing device;
and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature and high-pressure steam, and the high-temperature and high-pressure steam drives a Rankine cycle steam turbine generator system to perform continuous cycle of heat energy and electric energy conversion.
Optionally, the step of converting the thermal energy part of the high-temperature steam generated by the temperature varying device into electric energy through a rankine cycle steam turbine generator system comprises:
pumping the low-temperature liquid in the condenser-evaporator by a liquid pressure pump to convert the low-temperature liquid into low-temperature high-pressure liquid;
converting the low-temperature high-pressure liquid into high-temperature high-pressure steam by a temperature changing device;
and sending the high-temperature and high-pressure steam to a Rankine cycle steam turbine generator system to drive the Rankine cycle steam turbine generator system to generate power.
According to a third aspect of the invention, the application of the zero-carbon green seawater desalination system in zero-carbon material separation is provided.
According to a fourth aspect of the present invention, there is provided the use of the above method of desalinating seawater in the separation of zero-carbon materials.
The zero-carbon green seawater desalination system and the seawater desalination method can also be used for zero-carbon material separation in various industries.
The zero-carbon green seawater desalination system provides all required power for seawater desalination and can provide electric energy outwards, the zero-carbon green seawater desalination system takes the waste heat in mvr as an energy source, even if water is taken from the ice, temperature difference can be generated, so the operation cost of seawater desalination is negative, more than 20 kilowatt-hours of electric energy can be generated when one ton of seawater is evaporated, the electricity selling rate is higher than the water selling rate, and no pollution or discharge exists, so the zero-carbon green seawater desalination system becomes a natural zero-carbon green seawater desalination system.
In the face of endless sea and river and lake water including brackish water, the zero-carbon green seawater desalination system enables human beings to have infinite clean water sources and clean energy sources, and as the system equipment can be large or small, the system can be used for a plurality of objects such as seasides, ships, islands, deserts and the like, so that the human beings can obtain complete freedom in water resources.
If the concentration of the discharged brine is increased, the zero-carbon green seawater desalination system can become a natural typical vacuum salt production system, if the concentrated brine is input into a subsequent process, the subsequent chemical production process of the tetraacid trialkali can be developed, and the mvr seawater desalination device and the cold power generation equipment are further utilized to greatly reduce the production cost.
The zero-carbon green seawater desalination system can easily solve the problem that all industries need to separate liquid by a distillation process, including chemical industry, food industry, medicine industry, sewage treatment industry and the like.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a zero-carbon green seawater desalination system according to the present invention;
icon: 1-a condensation-evaporator, 2-a temperature changing device, 3-a first heat exchanger, 4-a regenerative heat exchanger, 5-a high-pressure loop, 6-a low-pressure loop, 7-a second heat exchanger, 7A-a third heat exchanger, 8-a blower, 9-a temperature regulating valve, 10-a liquid booster pump, 11-a steam turbine, 12-a generator, 13-an external power supply, 14-mvr a seawater desalination device, 15-a seawater inlet end, 16-a concentrated brine discharge end and 17-a fresh water discharge end.
Detailed Description
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic diagram of an embodiment of the zero-carbon green seawater desalination system of the present invention, and as shown in fig. 1, the zero-carbon green seawater desalination system includes mvr seawater desalination device 14, condenser-evaporator 1, temperature changing device 2, and rankine cycle turbine generator system, where:
the Mvr seawater desalination device is used for sucking seawater and discharging strong brine and fresh water after the temperature is increased;
the condensation-evaporator is used for collecting mvr heat energy in the strong brine and the fresh water discharged by the seawater desalination device and reducing the temperature of the strong brine and the fresh water, a system working medium is configured in the condensation-evaporator, the heat energy in the strong brine and the fresh water discharged by the seawater desalination device mvr and exhaust gas heat energy generated by a Rankine cycle turbogenerator system are absorbed, and low-temperature steam is generated and is conveyed to the temperature changing device;
the temperature changing device is used for converting low-temperature steam generated by the condenser-evaporator into high-temperature steam;
the Rankine cycle steam turbine generator system is used for converting the heat energy of the high-temperature high-pressure steam generated by the temperature changing device into electric energy, supplying the electric energy to mvr seawater desalination devices for use, and outwards conveying redundant electric energy, exhaust gas generated by the Rankine cycle steam turbine generator system is condensed by a condenser-evaporator to form low-temperature liquid, and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature high-pressure steam.
In one embodiment, the rankine cycle turbogenerator system includes a liquid booster pump 10, a steam turbine 11, and a generator 12, the low pressure end of the liquid booster pump being in communication with the condenser-evaporator, the high pressure end of the liquid booster pump being in communication with the low temperature inlet end of the temperature varying device, the low temperature outlet end of the temperature varying device being in communication with the steam turbine, the steam turbine being in communication with the generator.
In one embodiment, the means for changing temperature comprises a heat exchanger mechanism having a low pressure loop 6 and a high pressure loop 5, and a blower 8 having an inlet end in communication with the low pressure loop of the heat exchanger mechanism and an outlet end in communication with the high pressure loop of the heat exchanger mechanism. Under the pumping action of the blower, low-temperature steam enters a low-pressure loop of the heat exchange mechanism, is pressurized and heated by the blower and then returns to a high-pressure loop of the heat exchange mechanism, the high-pressure loop and the low-pressure loop of the heat exchange mechanism have temperature difference, and the high-pressure loop heats the low-pressure loop to realize enthalpy increase of the low-pressure loop and enthalpy decrease of the high-pressure loop.
Preferably, the heat exchange mechanism comprises a first heat exchanger 3, a recuperative heat exchanger 4 and a second heat exchanger 7, the recuperative heat exchanger, the second heat exchanger and the blower are sequentially connected in series, and the first heat exchanger and the second heat exchanger are connected in parallel.
Preferably, the temperature varying device further comprises a temperature regulating valve 9, and the temperature regulating valve 9 is configured in the high-pressure loop of the temperature varying device and is used for controlling the flow distribution of the high-temperature and high-pressure steam output by the blower between the first heat exchanger and the second heat exchanger, so as to control the temperature range of the high-temperature steam output by the first heat exchanger.
Preferably, the heat exchange mechanism further comprises a third heat exchanger 7A for increasing the temperature difference between the high-pressure circuit and the low-pressure circuit at the high-temperature end of the second heat exchanger.
Preferably, the blower and/or the first heat exchanger and/or the second heat exchanger and/or the third heat exchanger are provided with an insulation layer.
Besides the temperature changing device, other components which have larger temperature difference with the environment also have insulating layers.
The invention also provides a method for desalinating seawater by using the zero-carbon green seawater desalination system, which comprises the following steps:
sucking seawater through an mvr seawater desalination device, and discharging concentrated salt water and fresh water with increased temperature;
the heat energy in the strong brine and the fresh water discharged by the seawater desalination device is collected mvr through a condenser-evaporator, the temperature of the strong brine and the temperature of the fresh water are reduced, the system working medium absorbs the heat energy, and low-temperature steam is generated and conveyed to a temperature changing device;
converting low-temperature steam generated by the condenser-evaporator into high-temperature steam by a temperature changing device;
converting the heat energy part of the high-temperature steam generated by the temperature changing device into electric energy through a Rankine cycle turbine generator system, supplying the electric energy to mvr seawater desalination devices for use, and transmitting the redundant electric energy outwards;
exhaust gas generated by the Rankine cycle steam turbine generator system is condensed by a condenser-evaporator, low-temperature liquid is formed after heat transfer, and system working media in condensation of the condenser-evaporator absorb the heat to generate low-temperature steam which is sent to a temperature changing device;
and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature and high-pressure steam, and the high-temperature and high-pressure steam drives a Rankine cycle steam turbine generator system to perform continuous cycle of heat energy and electric energy conversion.
Optionally, the step of converting the thermal energy part of the high-temperature steam generated by the temperature varying device into electric energy through a rankine cycle steam turbine generator system comprises:
pumping the low-temperature liquid in the condenser-evaporator by a liquid pressure pump to convert the low-temperature liquid into low-temperature high-pressure liquid;
converting the low-temperature high-pressure liquid into high-temperature high-pressure steam by a temperature changing device;
and sending the high-temperature and high-pressure steam to a Rankine cycle steam turbine generator system to drive the Rankine cycle steam turbine generator system to generate power.
The invention also provides application of the method in zero-carbon material separation by using an mvr seawater desalination device, and the method for desalinating seawater by using the zero-carbon green seawater desalination system is suitable for any system for zero-carbon material separation by using a mvr system.
In one embodiment, the zero-carbon green seawater desalination system comprises a mechanical vapor recompression distillation liquid separation device, namely a mvr seawater desalination device, a condensation evaporator, a temperature changing device, a Rankine cycle turbine generator system and an external starting power supply, which are abbreviated as mvr, wherein:
mvr sea water desalination device sucks sea water through sea water inlet 15, discharges fresh water through fresh water discharge 17, discharges strong brine through strong brine discharge 16, realizes sea water desalination due to the work of mvr internal compressor, but the temperature of the discharged fresh water and strong brine will rise, the fresh water and strong brine after temperature rise enter the condensation-evaporator 1 to absorb the heat in fresh water and strong brine by the refrigeration function of the temperature changing device, the fresh water and strong brine after entering the condensation-evaporator 1 are cooled to near 0 degree, and form temperature difference with the liquid inlet temperature, and send the energy generated by the temperature difference into the condensation-evaporator 1 to exchange heat with the liquid in the condensation-evaporator 1, and the liquid is evaporated into low temperature steam after receiving energy;
the temperature changing device can change low-temperature steam into high-temperature steam, the high-temperature steam is provided for the steam turbine, and external energy is converted into electric energy through the generator;
the electric energy generated by the generator, except for a water pump which is used for driving a mechanical steam compressor and correspondingly driving seawater and needs to be configured for fresh water flowing, can be sold as a commercial power supply, and the electric energy of not less than 20 kilowatt-hours can be provided for the outside of the system every ton of water is evaporated.
The method for desalinating seawater by the zero-carbon green seawater desalination system comprises the following steps:
s1: firstly, an external power supply 13 is utilized to start mvr a seawater desalination device according to a normal program, when the fresh water yield of a mvr seawater desalination device obtains a target value, a temperature changing device blower 8 powered by the external power supply 13 is started, fresh water and strong brine with increased temperature enter a condenser-evaporator 1, the temperature is reduced to be close to 0 ℃, and then the fresh water and the strong brine are discharged through a strong brine discharge end 16 and a fresh water output end 17;
s2: the low-temperature working medium liquid in the condenser-evaporator 1 is heated by fresh water and strong brine, so that the liquid is evaporated to be low-temperature steam, and the low-temperature steam is further changed into high-temperature steam by the temperature changing device and is supplied to a high-temperature high-pressure loop of the turbonator 11;
s3: in the steam turbine 11, the high-temperature and high-pressure medium is subjected to isentropic expansion to drive the steam turbine 11 to rotate, so that the generator simultaneously generates electric energy, the energy is supplied to devices needing electricity in the system, and the electric energy is simultaneously output outwards;
s4: circulating S1-S3, and adjusting the power generation amount of the cold power generator according to the inlet water temperature and load change until the system stably runs;
in one embodiment, the steam turbine 11 is a steam turbine, the isentropic efficiency requirement is above 0.88, the synchronous speed of the steam turbine is 3000rpm when the power generation frequency is 50 hz, the power selection can be from 100 kw to 200 mw, and for redundancy, the steam turbine can be composed of several parallel units with smaller power, for example, 4 steam turbine generators with 60 mw form a 240 mw power generator unit, or several units with 200 mw power can form a larger power source base.
In one embodiment, the method for desalinating seawater by using the zero-carbon green seawater desalination system comprises the following steps:
the medium is made of green refrigerant r32 or water, the zero-carbon green seawater desalination system can automatically meet the high temperature of 50 degrees near the equator and can also adapt to the low temperature of minus 30 degrees in the north, and the zero-carbon green seawater desalination system must have the capability of taking water from the ice when the north and the south poles, and the water with the temperature of 4 degrees is also used.
In order to reduce the influence of the strong brine on the environment, the salinity of the discharged strong brine is not too high, generally 1:1, two parts of brine with the concentration of 3% are input, one part of brine without salt is output after being separated by an mvr seawater desalination device, and the other part of brine with the concentration of 6% is output.
If the temperature of the brine to be desalinated is 15 ℃, the temperature of the discharged fresh water and the temperature of the concentrated brine are both 0 ℃, the capacity of the zero-carbon green seawater desalination system for evaporating seawater every day is 100 ten thousand tons, the quantity of the seawater accessed into the system every day is 200 ten thousand tons according to the proportion of 1:2, and the flow rate of the seawater entering the zero-carbon green seawater desalination system every second is 2000000/1000/24/3600-23148 kg; according to the most advanced mvr sea water desalination system at present, the electric energy consumption for desalinating one ton of sea water can not exceed 20 kilowatt-hour, the consumed heat energy is not lost due to poor heat preservation, other electric energy is converted into the rising of the temperature of the discharged fresh water and the temperature of the concentrated brine, if the temperature of the brine entering the desalination is 15 ℃, the average temperature of the discharged fresh water and the concentrated brine is generally 24-26 ℃, the average value is 25 ℃, and then the energy entering the cold power generator is the generated energy of the cold power generator:
n ═ M × C × Δ T ═ 23148 × 4.18 × 25 ═ 242 KW;
the energy consumed by the zero-carbon green seawater desalination system is as follows:
n ═ M × C × Δ T ═ 23148 × 4.18 × 10 ═ 97 KW;
the electric power that the system can externally output is:
242-97 ═ 145 ten thousand KW;
the electricity generation energy in the whole year is 145 × 24 × 350 — 122 hundred million degrees in 350 days per year;
the fresh water can be produced by 100 x 350-3.5 million tons in 350 days per year.
The zero-carbon green seawater desalination system takes mvr waste heat and liquid temperature drop as energy sources, and provides energy sources for mvr.
The invention extracts mvr heat energy in the separated water and discharged waste liquid of the seawater desalination device, transmits the heat energy to the temperature changing device and the Rankine cycle turbine generator system, converts the low-temperature waste heat energy into electric energy, supplies the electric energy to the steam mechanical compressor of the mvr seawater desalination device, thereby realizing the automatic operation of the whole mvr seawater desalination device without external electric energy supply, and further becomes a zero-carbon green seawater desalination system to output the generated electric energy to the outside. The external power supply provides starting energy when starting, can be used as a safe energy backup at the same time, and becomes an outward output energy channel when the cold power generator works.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A zero-carbon green seawater desalination system is characterized in that: the system comprises mvr a seawater desalination device, a condensation-evaporator, a temperature changing device and a Rankine cycle turbine generator system;
the mvr sea water desalination device is used for sucking sea water and discharging strong brine and fresh water after the temperature is raised;
the condensation-evaporator is used for collecting mvr heat energy in the strong brine and the fresh water discharged by the seawater desalination device and reducing the temperature of the strong brine and the fresh water, a system working medium is configured in the condensation-evaporator, the heat energy in the strong brine and the fresh water discharged by the seawater desalination device mvr and exhaust gas heat energy generated by a Rankine cycle turbogenerator system are absorbed, and low-temperature steam is generated and is conveyed to the temperature changing device;
the temperature changing device is used for converting low-temperature steam generated by the condenser-evaporator into high-temperature steam;
the Rankine cycle steam turbine generator system is used for converting the heat energy of the high-temperature high-pressure steam generated by the temperature changing device into electric energy, supplying the electric energy to mvr seawater desalination devices for use, and outwards conveying redundant electric energy, exhaust gas generated by the Rankine cycle steam turbine generator system is condensed by a condenser-evaporator to form low-temperature liquid, and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature high-pressure steam.
2. The zero-carbon green seawater desalination system of claim 1, wherein: the Rankine cycle steam turbine generator system comprises a liquid pressure pump, a steam turbine and a generator, wherein the low-pressure end of the liquid pressure pump is communicated with a condenser-evaporator, the high-pressure end of the liquid pressure pump is communicated with the low-temperature inlet end of a temperature changing device, the low-temperature outlet end of the temperature changing device is communicated with the steam turbine, and the steam turbine is communicated with the generator.
3. The zero-carbon green seawater desalination system of claim 1, wherein: the temperature changing device comprises a heat exchanger mechanism and a blower, the heat exchange mechanism is provided with a low-pressure loop and a high-pressure loop, the inlet end of the blower is communicated with the low-pressure loop of the heat exchange mechanism, and the outlet end of the blower is communicated with the high-pressure loop of the heat exchange mechanism.
4. The zero-carbon green seawater desalination system of claim 3, wherein: the heat exchange mechanism comprises a first heat exchanger, a regenerative heat exchanger and a second heat exchanger, the regenerative heat exchanger, the second heat exchanger and the blower are sequentially connected in series, and the first heat exchanger is connected with the second heat exchanger in parallel.
5. The zero-carbon green seawater desalination system of claim 4, wherein: the temperature changing device also comprises a temperature adjusting valve, wherein the temperature adjusting valve is arranged in a high-pressure loop of the temperature changing device and is used for controlling the flow distribution of the high-temperature high-pressure steam output by the blower between the first heat exchanger and the second heat exchanger so as to control the temperature range of the high-temperature steam output by the first heat exchanger.
6. The zero-carbon green seawater desalination system of claim 4, wherein: the heat exchange mechanism further comprises a third heat exchanger, and the third heat exchanger is used for increasing the temperature difference between the high-pressure loop and the low-pressure loop at the high-temperature end of the second heat exchanger.
7. The zero-carbon green seawater desalination system of claim 6, wherein: the blower and/or the first heat exchanger and/or the second heat exchanger and/or the third heat exchanger are provided with an insulating layer.
8. A method for desalinating seawater by using the zero-carbon green seawater desalination system of claim 1, characterized in that: the method comprises the following steps:
sucking seawater through an mvr seawater desalination device, and discharging concentrated salt water and fresh water with increased temperature;
the heat energy in the strong brine and the fresh water discharged by the Mvr seawater desalination device is collected through a condenser-evaporator, the temperature of the strong brine and the temperature of the fresh water are reduced, the system working medium absorbs the heat energy, and low-temperature steam is generated and conveyed to the temperature changing device;
converting low-temperature steam generated by the condenser-evaporator into high-temperature steam by a temperature changing device;
converting the heat energy part of the high-temperature steam generated by the temperature changing device into electric energy through a Rankine cycle turbine generator system, supplying the electric energy to mvr seawater desalination devices for use, and transmitting the redundant electric energy outwards;
exhaust gas generated by the Rankine cycle steam turbine generator system is condensed by a condenser-evaporator, low-temperature liquid is formed after heat transfer, and system working media in condensation of the condenser-evaporator absorb the heat to generate low-temperature steam which is sent to a temperature changing device;
and the low-temperature liquid is pressurized and then exchanges heat with the high-temperature steam of the temperature changing device to form high-temperature and high-pressure steam, and the high-temperature and high-pressure steam drives a Rankine cycle steam turbine generator system to perform continuous cycle of heat energy and electric energy conversion.
9. The method of claim 8, wherein: the step of converting the heat energy part of the high-temperature steam generated by the temperature varying device into electric energy by the rankine cycle steam turbine generator system includes:
pumping the low-temperature liquid in the condenser-evaporator by a liquid pressure pump to convert the low-temperature liquid into low-temperature high-pressure liquid;
converting the low-temperature high-pressure liquid into high-temperature high-pressure steam by a temperature changing device;
and sending the high-temperature and high-pressure steam to a Rankine cycle steam turbine generator system to drive the Rankine cycle steam turbine generator system to generate power.
10. Use of the zero-carbon green seawater desalination system of any one of claims 1-7 or the method of 8 or 9 for zero-carbon material separation.
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