CN114349195B - Marine seawater desalination system taking carbon dioxide recovery into consideration and working method - Google Patents
Marine seawater desalination system taking carbon dioxide recovery into consideration and working method Download PDFInfo
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- CN114349195B CN114349195B CN202210036514.7A CN202210036514A CN114349195B CN 114349195 B CN114349195 B CN 114349195B CN 202210036514 A CN202210036514 A CN 202210036514A CN 114349195 B CN114349195 B CN 114349195B
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Abstract
The invention discloses a marine seawater desalination system taking carbon dioxide recovery into account and a working method thereof. In the flue gas treatment unit, high-temperature flue gas generated by an internal combustion engine is subjected to oxidation catalytic reduction, a mixture of high-temperature carbon dioxide, nitrogen and water vapor generated after reduction is subjected to waste heat recovery and temperature reduction, then enters an adsorption device for drying, and then enters a gas compressor after heat exchange between a heat exchanger and LNG cold energy, wherein part of high-pressure liquid carbon dioxide is directly collected, the other part of high-pressure liquid carbon dioxide with pressure enters an energy recovery device for pressure conversion with raw seawater to be changed into gas state again, then enters the gas compressor for circulation, and the converted high-pressure seawater forms fresh water through a reverse osmosis membrane. The invention realizes zero carbon emission and sea water desalination functions of the internal combustion engine by utilizing the critical pressure of carbon dioxide and the pressure conversion of the raw sea water to ensure that the raw sea water can reach the pressure required by the reverse osmosis membrane to work without a high pressure pump.
Description
Technical Field
The invention relates to the fields of environmental protection and energy efficient utilization, in particular to a marine sea water desalination system taking carbon dioxide recovery into consideration and a working method thereof.
Background
The sea water desalting device is divided into a reverse osmosis device and a sea water distilling device in principle, and the reverse osmosis membrane method accounts for 65% from the sea water engineering which is established and applied in the global scope. From the domestic point of view, 103 seawater desalination projects are built nationwide by 2018, the water production scale exceeds 90 ten thousand meters per day, wherein the membrane method reverse osmosis seawater desalination water production is about 57 ten thousand meters per day, and accounts for 63.3 percent of the total water production, and is in absolute dominance. Along with commercialization of reverse osmosis sea water desalination technology, the technology is increasingly widely applied to ships.
In a reverse osmosis membrane seawater desalination system, seawater is subjected to pretreatment to obtain a predetermined water quality, and then is pressurized by a high-pressure pump and sent to a reverse osmosis membrane separation device. Part of the pressurized high-pressure seawater overcomes osmotic pressure and passes through a reverse osmosis membrane to become fresh water, and the other part of the seawater with increased salt concentration is discharged from the reverse osmosis separation device as concentrated seawater. However, in the reverse osmosis membrane seawater desalination process, because the seawater has high salt content, the reverse osmosis process needs larger pressure, so the seawater desalination process certainly needs to consume a large amount of energy, and the main energy consumption is the supercharging energy consumption of the high-pressure pump on the inflow water, and the operation pressure of the high-pressure pump is usually as high as 5mpa to 6mpa.
In order to reduce the energy consumption of the part, the pumping pressure of a high-pressure pump in a conventional reverse osmosis device is replaced by the hydraulic pressure in the deep sea in the prior art, so that the sea water desalination is completed, but the method generally needs to install the device in the deep sea with the depth of more than 200 meters, and the operation and maintenance are difficult to implement, so that the development of a system which can replace the high-pressure pump and can recycle the pressure is not slow.
The invention discloses a thermal film coupling sea water desalination system, which is used for reducing the energy consumption of the thermal film coupling sea water desalination system, and has the application number of 201310002417.7 and the name of 'a thermal film coupling sea water desalination system'. The system comprises a seawater pretreatment unit, a reverse osmosis unit and a low-temperature multi-effect unit, wherein a steam turbine is arranged on a steam inlet pipeline, the steam turbine is connected with a high-pressure pump shaft of the reverse osmosis unit in series, and the high-pressure pump is driven to work by utilizing steam expansion work, so that the utilization rate of steam heat energy is provided, and the electric energy consumed by the high-pressure pump is reduced. In the system, the high-pressure pump is driven to work by using the work of the steam turbine, and the consumed electric energy is reduced, but the energy consumption of the steam turbine is increased, and the energy consumption of the reverse osmosis membrane sea water desalination system is not reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the marine seawater desalination system with carbon dioxide recovery, which captures and recovers carbon dioxide generated by an internal combustion engine by utilizing a flue gas treatment unit, and simultaneously utilizes the critical pressure of the carbon dioxide and the seawater to perform pressure conversion so as to achieve the pressure condition required by reverse osmosis membrane seawater desalination, thereby realizing zero carbon emission of the internal combustion engine and fresh water preparation.
The invention adopts the following technical scheme for realizing the purposes of the invention:
a marine sea water desalination system taking carbon dioxide recovery into consideration comprises a flue gas treatment unit, an energy conversion unit and a sea water desalination unit;
the flue gas treatment unit comprises: the LNG pump comprises an LNG inlet, an LNG pump, an internal combustion engine, a flue gas catalytic converter, a waste heat recoverer, an adsorption device and a heat exchanger, wherein the LNG inlet is connected with a left joint of the LNG pump through a pipeline, a right joint of the LNG pump is connected with an upper joint of the heat exchanger through a pipeline, a lower joint of the heat exchanger is connected with a lower joint of the internal combustion engine through a pipeline, and the internal combustion engine is sequentially connected with the flue gas catalytic converter, the waste heat recoverer, the adsorption device and the heat exchanger;
the energy conversion unit includes: the device comprises a gas compressor, a pressure sensor I, a pressure sensor II, a PLC controller, a first electric control valve, a second electric control valve, an expansion valve, a separator, a nitrogen outlet, a liquid carbon dioxide outlet, an energy recovery device I, a check valve, a filter and a raw seawater inlet, wherein the left interface of the gas compressor (8) is connected with the heat exchanger through a pipeline, the right interface of the gas compressor is connected with the lower interface of the pressure sensor I through a pipeline, the upper interface of the pressure sensor I is connected with the PLC controller through a signal cable, the PLC controller is simultaneously connected with the first electric control valve and the second electric control valve through signal cables respectively, the upper interface of the first electric control valve is connected with the right interface of the gas compressor through a pipeline, the lower interface of the first electric control valve is connected with the separator through a pipeline, the upper interface of the separator is the nitrogen outlet, the lower interface of the separator is the liquid carbon dioxide outlet, the lower interface of the pressure sensor II is also connected with the PLC controller through a signal cable, the left interface of the expansion valve is connected with the lower interface of the pressure sensor I through a pipeline, the lower interface of the electric control valve is connected with the lower interface of the pressure sensor I through a pipeline, the lower interface of the expansion valve is connected with the energy recovery device through a pipeline, the lower interface of the expansion valve is connected with the expansion valve through a lower interface of the second electric control valve through a pipeline, the lower interface of the expansion valve is connected with the expansion valve through a lower interface, the lower interface of the expansion valve is connected with the expansion device, and the energy recovery device is connected with the lower interface through a pipeline, the check valve is sequentially connected with the filter and the raw seawater inlet through a pipeline;
the sea water desalination unit comprises a first-stage reverse osmosis membrane, a c interface of the energy recovery device I is connected with the first-stage reverse osmosis membrane through a pipeline, and a right interface of the first-stage reverse osmosis membrane is connected with the fresh water collecting box through a pipeline.
Preferably, the fuel in the internal combustion engine is natural gas, the heat exchanger is a plate heat exchanger, and a flue gas channel and an LNG channel are arranged in the heat exchanger.
Preferably, a catalyst and a reducing agent are arranged in the flue gas catalytic converter, the catalyst is a metal oxide or zeolite molecular sieve, and the reducing agent is urea or liquid ammonia.
Preferably, a steam pipeline is arranged in the waste heat recoverer, and waste heat recovery is utilized to supply heat or generate power.
Preferably, the adsorption device is provided with an adsorbent, and the adsorbent is activated carbon or activated alumina.
Preferably, the nitrogen outlet is provided with a gas storage tank, and the liquid carbon dioxide outlet is provided with a liquid storage tank.
Preferably, the expansion valve is a gas expansion valve, and plays a role in throttling and depressurization.
Preferably, the sea water desalination unit is internally provided with a second-stage reverse osmosis membrane, an energy recovery device II, a booster pump and a concentrated sea water outlet, the lower interface of the first-stage reverse osmosis membrane is connected with the c interface of the energy recovery device II through a pipeline, the d interface of the energy recovery device II is connected with the left interface of the concentrated sea water outlet through a pipeline, the a interface of the energy recovery device II is connected with the upper interface of the filter through a pipeline, the b interface of the energy recovery device II is connected with the left interface of the booster pump through a pipeline, the right interface of the booster pump is connected with the left interface of the second-stage reverse osmosis membrane through a pipeline, and the right interface of the second-stage reverse osmosis membrane is connected with the fresh water collecting box through a pipeline.
Preferably, the energy recovery device I and the energy recovery device II are power exchange type pressure recovery components, a piston is arranged in the energy recovery device I, two cavities are arranged on the left and right sides of the piston in the energy recovery device I, and two cavities are arranged on the upper portion and the lower portion of the piston in the energy recovery device II.
Preferably, an energy storage water wheel is arranged at the lower interface of the secondary reverse osmosis membrane, and the other interface of the energy storage water wheel is connected with the compressor shaft.
According to another aspect of the invention, there is provided a marine seawater desalination working method taking carbon dioxide recovery into account, comprising:
(a) The LNG inlet is gasified by the LNG pump and then is used for the internal combustion engine to do work, smoke generated by combustion of the internal combustion engine is reduced in the smoke catalytic converter, a mixture of high-temperature nitrogen, water vapor and carbon dioxide after reduction enters the waste heat recoverer and is cooled to 50-60 ℃ by consumed heat, then the mixture is absorbed by the absorption device and then enters the heat exchanger to be cooled to 25-30 ℃ for the second time with cold energy released by LNG gasification, and finally the nitrogen and carbon dioxide gas enter the gas compressor to increase the pressure to 5-7 mpa.
(b) When the pressure sensor I detects that the pressure reaches 7Mpa, the PLC controller drives the first electric control valve to liquefy part of carbon dioxide and then flow out through the lower interface of the separator, namely the liquid carbon dioxide outlet, and nitrogen flows out from the nitrogen outlet; when the pressure sensor II detects that the pressure of the carbon dioxide passing through the expansion valve is 5 mpa-6 mpa, the PLC controller drives the second electric control valve to enable the other part of the carbon dioxide with the pressure to enter the energy recovery device I, raw seawater enters the filter through the raw seawater inlet to remove colloid and suspended impurities in the raw seawater, then enters the energy recovery device I through the check valve to perform pressure conversion with the carbon dioxide with the pressure, high-pressure liquid carbon dioxide is changed into a gaseous state after conversion and enters the air compressor again, the raw seawater enters the first-stage reverse osmosis membrane to separate fresh water after pressure lifting, and the produced fresh water flows into the fresh water collecting box through a pipeline.
(c) And (3) the concentrated seawater with pressure discharged by the first-stage reverse osmosis membrane and the raw seawater which is shunted by the filter are discharged after pressure conversion in the energy recovery device II, the discharged concentrated seawater with pressure is pressurized to 5 mpa-6 mpa by the booster pump and enters the second-stage reverse osmosis membrane to separate fresh water, and meanwhile, the high-pressure concentrated seawater discharged by the second-stage reverse osmosis membrane drives the energy storage water wheel to rotate for working for the compressor.
By adopting the technical scheme, the invention at least comprises the following beneficial effects:
1. according to the invention, through the coupling of the flue gas treatment unit and the energy conversion unit, the critical pressure of carbon dioxide is utilized efficiently, the pressure leakage loss is avoided, the energy recycling is enhanced, and the liquid carbon dioxide is collected while the fresh water is prepared. In the energy conversion device, carbon dioxide after pressure conversion with the raw seawater enters the compressor again for circulation, so that not only is environmental pollution caused by direct discharge avoided, but also the recovery rate of the carbon dioxide is improved, and the recovery rate can reach more than 90%.
2. The invention utilizes the critical pressure of carbon dioxide and the original seawater to carry out pressure conversion in the energy recovery device in the energy conversion unit, avoids the extra energy consumed by using the high-pressure pump in the traditional reverse osmosis membrane seawater desalination system, and can reduce the power consumption by 30 percent.
3. The invention directly captures the carbon dioxide generated by the combustion of the natural gas by utilizing the LNG cold energy and the seawater cold energy, does not need secondary refrigerants, has simple and efficient system and realizes the zero carbon emission of the internal combustion engine.
4. The invention makes the high-pressure concentrated seawater discharged through the second-stage permeable membrane work through the energy storage water wheel so as to drive the compressor to work, thereby reducing the extra driving energy consumption of the compressor to a certain extent.
Drawings
Fig. 1 is a schematic diagram of the structural principle of a marine seawater desalination system with carbon dioxide recovery.
Reference numerals: LNG inlet 1, LNG pump 2, internal-combustion engine 3, flue gas catalytic converter 4, waste heat recovery ware 5, adsorption equipment 6, heat exchanger 7, compressor 8, pressure sensor I9, pressure sensor II10, first electronic control valve 11, second electronic control valve 12, expansion valve 13, energy recovery unit I14, energy recovery unit II15, primary reverse osmosis membrane 16, secondary reverse osmosis membrane 17, booster pump 18, energy storage water wheel 19, raw sea water inlet 20, filter 21, check valve 22, dense sea water outlet 23, fresh water collecting box 24, nitrogen gas outlet 25, liquid carbon dioxide outlet 26, separator 27, PLC controller 28.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings in the embodiments of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in FIG. 1, the marine seawater desalination system and the working method thereof with carbon dioxide recovery are provided, and the marine seawater desalination system comprises a flue gas treatment unit, an energy conversion unit and a seawater desalination unit.
Wherein the flue gas treatment unit comprises: LNG entry 1, LNG pump 2, internal-combustion engine 3, flue gas catalytic converter 4, waste heat recoverer 5, adsorption equipment 6, heat exchanger 7, LNG entry 1 passes through the pipe connection LNG pump 2 left side interface, LNG pump 2 right side interface passes through the pipe connection the upper junction of heat exchanger 7, the lower junction of heat exchanger 7 passes through the pipe connection internal-combustion engine 3's lower junction, LNG supplies internal-combustion engine 3 to do work after passing through LNG pump 2 vaporization, internal-combustion engine 3 passes through the pipe and connects gradually flue gas catalytic converter 4, waste heat recoverer 5, adsorption equipment 6 and heat exchanger 7 for flue gas that internal-combustion engine 3 produced reduces in flue gas converter 4, and the mixture of high temperature nitrogen gas after the reduction, vapor, carbon dioxide is cooled to 50 ~60 ℃ by the heat dissipation in waste heat recoverer 5, and then gets into heat exchanger 7 and the cold energy that LNG vaporization released and carries out the secondary cooling to 25 ~30 ℃ after the adsorbent in adsorption equipment 6 absorbs, the adsorbent is active carbon or active alumina, be equipped with catalyst in flue gas catalytic converter 4 and catalyst, the zeolite is the reduction catalyst, the zeolite is the reduction.
The heat exchanger 7 is a plate heat exchanger, and a flue gas channel and an LNG channel are arranged in the heat exchanger 7, so that the heat transfer coefficient of the plate heat exchanger is generally 2-3 times higher under the condition of the same pressure loss compared with a shell-and-tube heat exchanger.
Meanwhile, a steam pipeline is arranged in the waste heat recoverer 5, and waste heat recovery is utilized to supply heat or generate power.
The energy conversion unit includes: a compressor 8, a pressure sensor I9, a pressure sensor II10, a PLC 28, a first electric control valve 11, a second electric control valve 12, an expansion valve 13, a separator 27, a nitrogen outlet 25, a liquid carbon dioxide outlet 26, an energy recovery device I14, a check valve 22, a filter 21 and a raw seawater inlet 20;
as shown in fig. 1, the left interface of the air compressor 8 is connected with the right interface of the heat exchanger 7 through a pipeline, the right interface of the air compressor 8 is connected with the lower interface of the pressure sensor I9 through a pipeline, the upper interface of the pressure sensor I9 is connected with the left lower interface of the PLC controller 28 through a signal cable, the left interface of the PLC controller 28 is connected with the right interface of the first electric control valve 11 through a signal cable, the upper interface of the first electric control valve 11 is connected with the right interface of the air compressor 8 through a pipeline, the lower interface of the first electric control valve 11 is connected with the left interface of the separator 27 through a pipeline, the upper interface of the separator 27 is the nitrogen outlet 25, the lower interface of the separator 27 is the liquid carbon dioxide outlet 26, the left interface of the expansion valve 13 is connected with the lower interface of the pressure sensor I9 through a pipeline, the right interface of the expansion valve 13 is connected with the lower interface of the pressure sensor II10 through a pipeline, the upper interface of the pressure sensor II10 is connected with the right lower interface of the PLC 28 through a signal cable, the right interface of the PLC 28 is connected with the right interface of the second electric control valve 12 through a signal cable, the upper interface of the second electric control valve 12 is connected with the right interface of the expansion valve 13 through a pipeline, wherein the expansion valve 13 is a gas expansion valve, plays a role of throttling and depressurization, the lower interface of the second electric control valve 12 is connected with the a interface of the energy recovery device I14 through a pipeline, the b interface of the energy recovery device I14 is connected with the lower interface of the air compressor 8 through a pipeline, the d interface of the energy recovery device I14 is connected with the upper interface of the check valve 22 through a pipeline, the lower port of the check valve 22 is connected with the upper port of the filter 21 through a pipeline, and the lower port of the filter 21 is connected with the raw seawater inlet 20 through a pipeline.
A gas storage tank is arranged at the nitrogen outlet 25, and a liquid storage tank is arranged at the liquid carbon dioxide outlet 26 for recycling nitrogen and liquid carbon dioxide.
The energy recovery device I14 is a power exchange type pressure recovery component, a piston is arranged in the energy recovery device I14, two cavities are arranged on the left side and the right side of the piston, and when high-pressure liquid carbon dioxide enters the left cavity, the piston is pushed to move rightwards so as to lift the sea water pressure.
The sea water desalination unit includes: the energy recovery device comprises a first-stage reverse osmosis membrane 16, a second-stage reverse osmosis membrane 17, an energy storage water wheel 19, an energy recovery device II15, a booster pump 18, a concentrated seawater outlet 23 and a fresh water collecting box 24, wherein the left port of the first-stage reverse osmosis membrane 16 is connected with the c port of the energy recovery device I14 through a pipeline, the right port of the first-stage reverse osmosis membrane 16 is connected with the fresh water collecting box 24 through a pipeline, the lower port of the first-stage reverse osmosis membrane 16 is connected with the c port of the energy recovery device II15 through a pipeline, the pressurized concentrated seawater passing through the reverse osmosis membrane is recycled, the d port of the energy recovery device II15 is connected with the left port of the concentrated seawater outlet 23 through a pipeline, the a port of the energy recovery device II15 is connected with the upper port of the filter 21 through a pipeline, the b port of the energy recovery device II15 is connected with the left port of the booster pump 18 through a pipeline, the right port of the booster pump 18 is connected with the left port of the second-stage reverse osmosis membrane 17 through a pipeline, and the right port of the second-stage reverse osmosis membrane 17 is connected with the fresh water collecting box 24 through a pipeline.
The lower interface of the secondary reverse osmosis membrane 17 is provided with an energy storage water wheel 19, and the other interface of the energy storage water wheel 19 is connected with the air compressor 8, so that the high-pressure concentrated seawater discharged by the secondary reverse osmosis membrane 17 can drive the energy storage water wheel 19 to rotate to do work so as to store electric energy for the air compressor 8 to work.
The energy recovery device II15 is a power exchange type pressure recovery component, a piston is arranged in the energy recovery device II, two cavities are arranged above and below the piston, and when high-pressure liquid carbon dioxide enters the left cavity, the piston is pushed to move rightwards so as to lift the sea water pressure.
And when the pressure sensor II10 detects that the pressure of the carbon dioxide passing through the expansion valve 13 is 5Mpa to 6Mpa, the PLC 28 drives the second electric control valve 12 to enable the other part of the carbon dioxide with pressure to enter the energy recovery device I14, raw seawater enters the filter 21 through the raw seawater inlet 20 to remove colloid and suspended impurities in the raw seawater, then enters the energy recovery device I14 through the check valve 22 to be subjected to pressure conversion with the carbon dioxide with pressure, high-pressure liquid carbon dioxide is changed into a gaseous state again and enters the air compressor 8, and the raw seawater enters the fresh water collecting tank 24 after the pressure is lifted and enters the first-stage reverse osmosis membrane 16 to be separated, so that fresh water produced by the fresh water collecting tank 24 flows into the fresh water collecting tank.
In general, the pressure of the concentrated seawater discharged from the first-stage reverse osmosis membrane 16 may reach 4.8mpa to 5.8mpa, the part of the concentrated seawater with pressure and the raw seawater split by the filter 21 are discharged after pressure conversion in the energy recovery device II15, the discharged concentrated seawater with pressure is pressurized to 5mpa to 6mpa by the booster pump 18 and enters the second-stage reverse osmosis membrane 17 to separate fresh water, and the high-pressure concentrated seawater discharged from the second-stage reverse osmosis membrane 17 drives the energy storage water wheel 19 to rotate to do work for the compressor 8, so that the circulation is performed.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included.
In the description of the present invention, it should be noted that the positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Claims (8)
1. The marine seawater desalination system capable of recovering carbon dioxide is characterized by comprising a flue gas treatment unit, an energy conversion unit and a seawater desalination unit, wherein the flue gas treatment unit comprises: LNG entry (1), LNG pump (2), internal-combustion engine (3), flue gas catalytic converter (4), waste heat recoverer (5), adsorption equipment (6), heat exchanger (7), LNG entry (1) pass through the pipe connection LNG pump (2) left side interface, LNG pump (2) right side interface pass through the pipe connection heat exchanger (7) go up the interface, the lower interface of heat exchanger (7) passes through the pipe connection internal-combustion engine (3) lower interface, internal-combustion engine (3) with flue gas catalytic converter (4), waste heat recoverer (5), adsorption equipment (6) and heat exchanger (7) are connected in proper order;
the energy conversion unit includes: the device comprises a gas compressor (8), a pressure sensor I (9), a pressure sensor II (10), a PLC (programmable logic controller) (28), a first electric control valve (11), a second electric control valve (12), an expansion valve (13), a separator (27), a nitrogen outlet (25), a liquid carbon dioxide outlet (26), an energy recovery device I (14), a check valve (22), a filter (21) and an original seawater inlet (20), wherein the left interface of the gas compressor (8) is connected with the heat exchanger (7) through a pipeline, the right interface of the gas compressor (8) is connected with the lower interface of the pressure sensor I (9) through a pipeline, the upper interface of the pressure sensor I (9) is connected with the PLC (28) through a signal cable, the PLC (28) is simultaneously connected with the first electric control valve (11) and the second electric control valve (12) through signal cables, the upper interface of the first electric control valve (11) is connected with the right interface of the gas compressor (8) through a pipeline, the lower interface of the first electric control valve (11) is connected with the lower interface of the separator (27), the upper interface of the separator (27) is the nitrogen outlet of the separator (25), the pressure sensor II (10) is also connected with the PLC (28) through a signal cable, the left interface of the expansion valve (13) is connected with the lower interface of the pressure sensor I (9) through a pipeline, the right interface of the expansion valve (13) is connected with the lower interface of the pressure sensor II (10) through a pipeline, the upper interface of the second electric control valve (12) is connected with the right interface of the expansion valve (13) through a pipeline, the lower interface of the second electric control valve (12) is connected with the a interface of the energy recovery device I (14) through a pipeline, the b interface of the energy recovery device I (14) is connected with the lower interface of the air compressor (8) through a pipeline, the d interface of the energy recovery device I (14) is connected with the check valve (22) through a pipeline, and the check valve (22) is sequentially connected with the filter (21) and the raw seawater inlet (20) through a pipeline;
the sea water desalination unit comprises a first-stage reverse osmosis membrane (16), wherein a c interface of the energy recovery device I is connected with the first-stage reverse osmosis membrane (16) through a pipeline, and a right interface of the first-stage reverse osmosis membrane (16) is connected with a fresh water collecting box (24) through a pipeline; the seawater desalination unit is internally provided with a second-stage reverse osmosis membrane (17), an energy recovery device II (15), a booster pump (18) and a concentrated seawater outlet (23), wherein the lower interface of the first-stage reverse osmosis membrane (16) is connected with the c interface of the energy recovery device II (15) through a pipeline, the d interface of the energy recovery device II (15) is connected with the concentrated seawater outlet (23) through a pipeline, the a interface of the energy recovery device II (15) is connected with the upper interface of the filter (21) through a pipeline, the b interface of the energy recovery device II (15) is connected with the left interface of the booster pump (18) through a pipeline, the right interface of the booster pump (18) is connected with the left interface of the second-stage reverse osmosis membrane (17) through a pipeline, and the right interface of the second-stage reverse osmosis membrane (17) is connected with the fresh water collection box (24) through a pipeline; an energy storage water wheel (19) is arranged at the lower interface of the secondary reverse osmosis membrane (17), and the other interface of the energy storage water wheel (19) is connected with the compressor (8) through a shaft.
2. The marine seawater desalination system with carbon dioxide recovery as claimed in claim 1, wherein the fuel in the internal combustion engine (3) is natural gas, the heat exchanger (7) is a plate heat exchanger, and a flue gas channel and an LNG channel are arranged in the heat exchanger (7).
3. The marine seawater desalination system with carbon dioxide recovery as claimed in claim 1, wherein a catalyst and a reducing agent are arranged in the flue gas catalytic converter (4), the catalyst is a metal oxide or zeolite molecular sieve, and the reducing agent is urea or liquid ammonia; and a steam pipeline is arranged in the waste heat recoverer (5).
4. The marine seawater desalination system with carbon dioxide recovery as claimed in claim 1, wherein the adsorption device (6) is provided with an adsorbent, and the adsorbent is activated carbon or activated alumina.
5. A marine desalination system with carbon dioxide recovery as claimed in claim 1, wherein the nitrogen outlet (25) is provided with a gas storage tank and the liquid carbon dioxide outlet (26) is provided with a liquid storage tank.
6. A marine desalination system with carbon dioxide recovery as claimed in claim 1, wherein the expansion valve (13) is a gas expansion valve.
7. The marine seawater desalination system with carbon dioxide recovery as claimed in claim 1, wherein the energy recovery device I (14) and the energy recovery device II (15) are power exchange type pressure recovery components, a piston is arranged in the energy recovery device I (14), two cavities are arranged on the left and right sides of the piston in the energy recovery device I (14), and two cavities are arranged on the upper side and the lower side of the piston in the energy recovery device II (15).
8. A marine seawater desalination working method taking carbon dioxide recovery into consideration is characterized by comprising the following steps:
(a) The LNG inlet (1) is gasified by the LNG pump (2) and then is supplied to the internal combustion engine (3) to do work, the smoke generated by the combustion of the internal combustion engine (3) is reduced in the smoke catalytic converter (4), the mixture of nitrogen, water vapor and carbon dioxide with high temperature after reduction enters the waste heat recoverer (5) to be cooled to 50-60 ℃ by the consumed heat, then the water vapor is adsorbed by the adsorption device (6) and then enters the heat exchanger (7) to be cooled to 25-30 ℃ for the second time with the cold energy released by the LNG gasification, and finally the nitrogen and the carbon dioxide gas enter the gas compressor (8) to increase the pressure to 5-7 mpa;
(b) When the pressure sensor I (9) detects that the pressure reaches 7Mpa, the PLC (28) drives the first electric control valve (11) to liquefy part of carbon dioxide and then flow out through a liquid carbon dioxide outlet (26) which is the lower interface of the separator (27), and nitrogen flows out through a nitrogen outlet (25); when the pressure sensor II (10) detects that the pressure of the carbon dioxide passing through the expansion valve (13) is 5 mpa-6 mpa, the PLC (28) drives the second electric control valve (12) to enable the other part of the carbon dioxide with pressure to enter the energy recovery device I (14), raw seawater enters the filter (21) through the raw seawater inlet (20) to remove colloid and suspended impurities in the raw seawater, then enters the energy recovery device I (14) through the check valve (22) to perform pressure conversion with the carbon dioxide with pressure, high-pressure liquid carbon dioxide after conversion is changed into a gaseous state again to enter the air compressor (8), the raw seawater enters the first-stage reverse osmosis membrane (16) to separate fresh water after pressure elevation, and the generated fresh water flows into the fresh water collecting box (24) through a pipeline;
(c) The method comprises the steps that concentrated seawater with pressure discharged by a first-stage reverse osmosis membrane (16) and raw seawater which is shunted by a filter (21) are discharged after pressure conversion in an energy recovery device II (15), the discharged concentrated seawater with pressure is pressurized to 5-6 mpa by a booster pump (18) and enters a second-stage reverse osmosis membrane (17) to separate fresh water, and meanwhile, high-pressure concentrated seawater discharged by the second-stage reverse osmosis membrane (17) drives an energy storage water wheel (19) to rotate to do work so as to enable the air compressor (8) to work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210036514.7A CN114349195B (en) | 2022-01-13 | 2022-01-13 | Marine seawater desalination system taking carbon dioxide recovery into consideration and working method |
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| CN202210036514.7A CN114349195B (en) | 2022-01-13 | 2022-01-13 | Marine seawater desalination system taking carbon dioxide recovery into consideration and working method |
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| DE202004003175U1 (en) * | 2004-03-01 | 2004-07-08 | Schmid, Heinrich | Sea water desalination plant operated by liquid nitrogen, has evaporator pressurizing reverse osmosis unit and employs liberated gas to drive control equipment and liquids |
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| CN110332764B (en) * | 2019-05-27 | 2021-04-06 | 江苏科技大学 | Zero-emission power system for recycling CO2 by utilizing LNG cold energy cascade compound circulation |
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