CN102328970B - Fresh water replacement system of reverse osmosis seawater desalination device - Google Patents
Fresh water replacement system of reverse osmosis seawater desalination device Download PDFInfo
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- CN102328970B CN102328970B CN2011102623732A CN201110262373A CN102328970B CN 102328970 B CN102328970 B CN 102328970B CN 2011102623732 A CN2011102623732 A CN 2011102623732A CN 201110262373 A CN201110262373 A CN 201110262373A CN 102328970 B CN102328970 B CN 102328970B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention provides a fresh water replacement system of a reverse osmosis seawater desalination device. The fresh water replacement system comprises a fresh water tank, a water replacement pump and a fresh water pipeline, wherein an water inlet of the water replacement pump is connected with a water outlet of the fresh water tank, a water inlet of the fresh water pipeline is connected with a water outlet of the water replacement pump, and a water outlet of the fresh water pipeline is connected with a raw water inlet of an energy recovering device in the reverse osmosis seawater desalination device. According to the invention, the water outlet of the fresh water replacement system is connected with the raw water inlet of the energy recovering device in the reverse osmosis seawater desalination device, the fresh water replacement system, a raw water side of the energy recovering device, an energy-recovering lift pump, a reverse osmosis membrane stack and an energy-recovering concentrated water side constitute a fresh water replacement loop, not only can freshwater replacement to a reverse osmosis membrane be realized, but also the fresh water replacement to the energy revering device can be realized, and thus, the fault rate of the energy recovering device is decreased.
Description
Technical field
The invention belongs to the reverse osmosis seawater desalting technical field, relate in particular to a kind of fresh water exchange system of reverse osmosis desalination device.
Background technology
The reverse osmosis seawater desalting method is the method for utilizing the principle of reverse osmosis to carry out sea water desaltination, high pressure sea water is flowed through and is separated into dense water and fresh water behind the reverse osmosis membrane, having simple, easy to operate, the no phase transformation of equipment, processing efficiency height and low power consumption and other advantages, is the main method of present sea water desaltination.
Reverse osmosis desalination device generally comprises sea water preprocessing device and the saturating desalting plant of seawater reverse osmosis, the sea water preprocessing device generally comprises settling tank, settling pond, medicine system and strainer etc., main purpose is to remove throw out in the seawater, colloidalmaterial, suspended solids, microorganism etc., phenomenons such as face generation fouling, the dirt that prevents reverse osmosis membrane blocked up, oxidation destruction influence treatment effect; The saturating desalting plant of seawater reverse osmosis mainly comprises security personnel's filter, high-pressure pump, energy recycle device, reverse-osmosis membrane element, penstock, reverse osmosis water tank etc., effect is that seawater is being obtained fresh water through after the reverse osmosis membrane separation under the effect of high pressure, and the energy recovery in the high-pressure thick water after will separating.In addition, because sea water salinity is higher, separate out the indissoluble salinity for fear of the concentrated seawater of shutting down the dense water side of back reverse osmosis membrane, reverse osmosis desalination device generally all is equipped with the fresh water exchange system.
Present disclosed fresh water exchange system mainly is made up of fresh water water tank, fresh water displacement pump and strainer, this fresh water displacement apparatus links to each other with the reverse osmosis membrane stack of reverse osmosis desalination device by pipeline, the outlet conduit that is the fresh water displacement apparatus links to each other with the high pressure water inlet manifold of reverse osmosis membrane stack, the fresh water displacement pump pumps into fresh water from the high pressure water inlet manifold, enter in the reverse osmosis membrane stack seawater is replaced, the dense water that displaces discharges by reverse osmosis membrane stack high-pressure thick water outfall sewer.At this moment, need to arrange respectively high pressure inlet valve and high-pressure discharge valve on the high pressure water inlet manifold of reverse osmosis membrane stack and the high-pressure thick water outfall sewer, in order to realize pumping into and discharging of fresh water, the use of high pressure valve makes Cost of seawater desalination higher.In addition; though above-mentioned fresh water displacement apparatus can be replaced the seawater in the reverse osmosis membrane stack; but the dense water after the displacement can discharge in reverse osmosis membrane stack high-pressure thick water one side; no matter be that dense water after fresh water or the displacement all can not pass through energy recycle device; therefore, energy recycle device can't carry out the fresh water displacement, and the high density salt solution that accumulate its inside is separated out the indissoluble salinity easily when shutting down; cause the rotating element in the energy recycle device stuck, cause equipment failure.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of fresh water exchange system of reverse osmosis desalination device, fresh water exchange system provided by the invention can be used for the sea water desalinating plant of many cover reverse osmosis membrane stacks parallel connection, can realize the fresh water displacement to energy recycle device, reduce the energy recycle device failure rate.
The invention provides a kind of fresh water exchange system of reverse osmosis desalination device, comprise the fresh water water tank, the displacement water pump that water-in links to each other with the water outlet of described fresh water water tank, the fresh water pipeline that water-in links to each other with the water outlet of described displacement water pump, the water outlet of described fresh water pipeline links to each other with the raw water inlet of energy recycle device in the reverse osmosis desalination device by fresh water displacement valve.
Preferably, also comprise the discharge tube that links to each other with described fresh water pipe end, described discharge tube is provided with vent valves.
Preferably, also comprise first strainer, the water-in of described first strainer links to each other with the water outlet of described displacement water pump, and water outlet links to each other with the water-in of described fresh water pipeline.
Preferably, also comprise second strainer, the water-in of described second strainer links to each other with described fresh water displacement valve, and water outlet links to each other with the raw water inlet of described energy recycle device.
Preferably, described fresh water pipeline is provided with some water outlets, and described each water outlet links to each other with the raw water inlet of energy recycle device in the corresponding reverse osmosis desalination device by fresh water displacement valve respectively.
Compared with prior art, fresh water exchange system provided by the invention, comprise the fresh water water tank, the displacement water pump that water-in links to each other with the water outlet of described fresh water water tank, the fresh water pipeline that water-in links to each other with the water outlet of described displacement water pump, the water outlet of described fresh water pipeline links to each other with the raw water inlet of energy recycle device in the reverse osmosis desalination device by fresh water displacement valve.The raw water inlet of the energy recycle device in the water outlet of fresh water exchange system provided by the invention and the reverse osmosis desalination device links to each other, the fresh water exchange system, the former water side of energy recycle device, can return lift pump, the dense water side of reverse osmosis membrane stack and energy recovery is formed fresh water displacement loop, be fresh water at the displacement water pump and can return the former water side of passing through energy recycle device under the effect of lift pump and enter the reverse osmosis membrane stack, reverse osmosis membrane is carried out the fresh water displacement, enter dense water side the energy recycle device from the dense water side water outlet of reverse osmosis membrane stack then, energy recycle device is carried out the fresh water displacement low-press thick water outlet discharging of back by energy recycle device that finish.Fresh water exchange system provided by the invention not only can be realized the fresh water displacement to reverse osmosis membrane, and can realize the fresh water displacement to energy recycle device, has reduced the failure rate of energy recycle device.
Further, fresh water exchange system provided by the invention also comprises the discharge tube that links to each other with described fresh water pipe end, described discharge tube is provided with vent valves, when generation in the fresh water pipeline contains the hydrops of microorganism in a large number, described hydrops can be discharged by discharge tube, then sea water desalinating plant is carried out the fresh water displacement, can avoid microorganism that reverse osmosis membrane is formed and pollute.
Description of drawings
The structural representation of the fresh water exchange system that Fig. 1 provides for the embodiment of the invention;
The fresh water exchange system that Fig. 2 provides for the embodiment of the invention and first kind of mode of connection of reverse osmosis desalination device;
The fresh water exchange system that Fig. 3 provides for the embodiment of the invention and second kind of mode of connection of reverse osmosis desalination device.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The invention provides a kind of fresh water exchange system of reverse osmosis desalination device, comprise the fresh water water tank, the displacement water pump that water-in links to each other with the water outlet of described fresh water water tank, the fresh water pipeline that water-in links to each other with the water outlet of described displacement water pump, the water outlet of described fresh water pipeline links to each other with the raw water inlet of energy recycle device in the reverse osmosis desalination device by fresh water displacement valve.
Referring to Fig. 1, the structural representation of the fresh water exchange system that Fig. 1 provides for the embodiment of the invention, wherein, 11 is the fresh water water tank, 12 is the displacement water pump that water-in links to each other with the water outlet of fresh water water tank 11,13 is the strainer that water-in links to each other with the water outlet of displacement water pump 12,14 is the fresh water pipeline that water-in links to each other with the water outlet of strainer 13,15 is the energy recycle device that raw water inlet links to each other with fresh water pipeline 14, and 18 for being arranged on the fresh water displacement valve between energy recycle device 15 raw water inlets and fresh water pipeline 14 water outlets.
The effect of fresh water water tank 11 is storing fresh water, and fresh water water tank 11 is provided with water outlet.
The water-in of displacement water pump 12 links to each other with the water outlet of fresh water water tank 11, and water outlet links to each other with the water-in of strainer 13.Displacement water pump 12 pumps the fresh water in the fresh water water tank 11, participates in the fresh water displacement to reverse osmosis membrane and energy replacement device.
The water-in of strainer 13 links to each other with the water outlet of displacement water pump 12, and water outlet links to each other with fresh water pipeline 14.The effect of strainer 13 is the suspended matter in the fresh water is filtered, and avoids stopping up the fenestra of reverse osmosis membrane.
The water-in of fresh water pipeline 14 links to each other with the water outlet of strainer 13, water outlet links to each other with the raw water inlet of energy recycle device 15 by fresh water displacement valve 18, make the former water side of fresh water exchange system and energy recycle device, can return lift pump, the dense water side of reverse osmosis membrane stack and energy recycle device forms fresh water displacement loop, fresh water enters the former water side of energy recycle device 15 by fresh water pipeline 14, it is the supercharging side, under the effect that can return lift pump, enter the reverse osmosis membrane stack then, in the reverse osmosis membrane stack, realize the dense water side that fresh water displacement back enters energy recycle device by the dense water water outlet of reverse osmosis membrane stack, it is depressurised side, energy recycle device is carried out fresh water displacement back by the energy recycle device discharging, thereby realize the fresh water displacement to reverse osmosis membrane stack and energy recycle device.
In other embodiment provided by the invention, can also not comprise strainer 13, but directly that the water-in of the strainer that links to each other with energy recycle device 15 in the water outlet of fresh water pipeline 14 and the reverse osmosis desalination device is continuous, namely the fresh water exchange system directly utilizes the reverse osmosis desalination device middle filtrator.When reverse osmosis desalination device mesohigh pump and energy recycle device shared a strainer, fresh water displacement valve 18 linked to each other with the water-in of this strainer; When high-pressure pump and energy recycle device arranged separately strainer respectively, fresh water displacement valve 18 linked to each other with the water-in of the strainer that is used for energy recycle device.
When reverse osmosis desalination device is that a plurality of reverse osmosis membrane stacks are when in parallel, fresh water pipeline 14 is provided with a plurality of water outlets, each water outlet links to each other with the raw water inlet of corresponding energy recycle device by fresh water displacement valve respectively, between each water outlet and energy recycle device, be respectively arranged with fresh water displacement valve, be used for the fresh water displacement that reverse osmosis membrane stack and energy recycle device are respectively overlapped in control.
When reverse osmosis desalination device is that a plurality of reverse osmosis membrane stacks are when in parallel; fresh water pipeline 14 is long; the hydrops amount is bigger in the pipeline; when the reverse osmosis desalination device long-play; hydrops rests in the pipeline for a long time, and the prolific situation of microorganism takes place easily, when carrying out the fresh water displacement after reverse osmosis desalination device is shut down; the hydrops that contains a large amount of microorganisms that accumulates in the pipeline charges in the reverse osmosis membrane stack, causes the reverse osmosis membrane microbial contamination.For fear of the microbial contamination reverse osmosis membrane, fresh water exchange system provided by the invention also comprises discharge tube 16, and discharge tube 16 links to each other with the end of fresh water pipeline 14, and discharge tube 16 is provided with vent valves 17.When needs carry out the fresh water displacement to the reverse osmosis membrane stack, at first open vent valves 17, hydrops in the fresh water pipeline 14 is emitted, open displacement 13 pairs of reverse osmosis membrane stacks of water pump and energy recycle device then and carry out the fresh water displacement, be discharged owing to contain the hydrops of microorganism in the pipeline, therefore can not pollute reverse osmosis membrane.
The working process of fresh water exchange system provided by the invention is as follows:
After sea water desalinating plant is shut down, with high-pressure pump, can return lift pump and inlet valve is closed;
Open vent valves 17, the discharging of the hydrops in the fresh water pipeline 14 is finished, close vent valves 17;
Open fresh water displacement valve 18 and displacement water pump 12, the fresh water in the fresh water water tank 11 enters strainer 13 via displacement water pump 12, filters by the former water side that is entered energy recycle device 15 by fresh water pipeline 14;
Open and to return lift pump, fresh water through transducing by carrying out the fresh water displacement by entering reverse osmosis membrane heap after returning the lift pump adherence pressure, water after the displacement enters through the high pressure liquid water-in of energy recycle device, to energy recycle device replace and transducing after from the discharging of the low-press thick water outlet of energy recycle device.
By above-mentioned working process as can be known, fresh water exchange system provided by the invention not only can be realized the fresh water displacement to reverse osmosis membrane, and can realize the fresh water displacement to energy recycle device, has reduced the failure rate of energy recycle device.
Fresh water exchange system provided by the invention can be connected with the reverse osmosis desalination device of different structure by different modes.
In the fresh water exchange system provided by the invention, when it was provided with strainer, its fresh water pipe water outlet can be directly links to each other with the raw water inlet of energy recycle device in the reverse osmosis desalination device, referring to Fig. 1.
Referring to Fig. 2, the fresh water exchange system that Fig. 2 provides for the embodiment of the invention and second kind of mode of connection of reverse osmosis desalination device, wherein, 21 is the fresh water exchange system, 22 are the desalination by reverse osmosis device, and the raw water inlet of energy recycle device links to each other with the water outlet of fresh water exchange system 21 by fresh water displacement valve in the desalination by reverse osmosis device 22.
In fresh water exchange system 21,211 is the fresh water water tank, 212 is the displacement water pump that water-in links to each other with the water outlet of fresh water water tank 11,213 is the fresh water pipeline that water-in links to each other with the water outlet of displacement water pump 212, the water outlet of fresh water pipeline 213 links to each other by the water-in of the energy recycle device in fresh water displacement valve 214 and the sea water desalinating plant 22,215 is the discharge tube that links to each other with the end of fresh water pipeline 213, and discharge tube 215 is provided with vent valves 216.In the present embodiment, except strainer was not set, fresh water exchange system 21 had same structure and function with fresh water exchange system mentioned above.
In desalination by reverse osmosis device 22,221 is topping-up pump, 222 is first valve that water-in links to each other with the water outlet of topping-up pump 221,223 is first strainer that water-in links to each other with the water outlet of first valve 222,224 is the high-pressure pump that water-in links to each other with the water outlet of first strainer 223,225 is the reverse osmosis membrane stack that water-in links to each other with the water outlet of high-pressure pump 224,226 is the energy recycle device that the high pressure liquid water-in links to each other with the dense water water outlet of reverse osmosis membrane stack 225,227 link to each other with the power fluid water outlet of energy recycle device 226 for water-in can return lift pump, the water outlet that can return lift pump 227 links to each other with the water-in of reverse osmosis membrane stack, 228 is second strainer that water-in links to each other with the water outlet of topping-up pump 221, the water outlet of second strainer 228 links to each other with the raw water inlet of energy recycle device 226, and 229 for being arranged on second valve between topping-up pump 221 and second strainer 228.
The desalination by reverse osmosis device that present embodiment provides is the reverse osmosis desalination device that the strainer branch of the strainer of high-pressure pump and energy recycle device is arranged.
Topping-up pump 221 directly links to each other with seawater, this seawater can for through after the pre-treatment, do not contain the seawater of impurity such as suspended particle, microorganism.
The water-in of first strainer 223 links to each other with the water outlet of topping-up pump 221, and water outlet links to each other with the water-in of high-pressure pump 224.Seawater enters first strainer 223 under the effect of topping-up pump 221, enter high-pressure pump 224 after the filtration.
Be provided with first valve 222 between first strainer 223 and the topping-up pump 221.
The water-in of high-pressure pump 224 links to each other with the water outlet of first strainer 223, and water outlet links to each other with the water-in of reverse osmosis membrane stack 225, and effect is seawater is pressurizeed, and makes it enter reverse osmosis membrane stack 225 and carries out membrane sepn.
Reverse osmosis membrane stack 225 is the main device of sea water desaltination, utilizes reverse osmosis membrane with salinity and water sepn, finally obtains fresh water and the dense water that is rich in energy.Reverse osmosis membrane stack 225 comprises water-in, fresh water water outlet and dense water water outlet, the water outlet of its water-in and high-pressure pump 224 and the water outlet that can return lift pump 227 link to each other, the fresh water water outlet links to each other with the fresh water storing device, dense water water outlet links to each other with the high pressure liquid water-in of energy recycle device, is convenient to the energy recovery utilization in the dense water.
The effect of energy recycle device 226 is to reclaim the energy in the dense water, it comprises high pressure liquid water-in, raw water inlet, power fluid water outlet and low-press thick water water outlet, wherein the high pressure liquid water-in links to each other with the dense water water outlet of reverse osmosis membrane stack 225, raw water inlet links to each other with fresh water displacement mouth with seawater, the power fluid water outlet links to each other with the water-in that can return lift pump 227, and low-press thick water water outlet links to each other with low pressure concentrated water discharge or storing unit.The dense water of reverse osmosis membrane stack 225 enters energy recycle device, carry out energy exchange with the former water that enters from raw water inlet, former water obtains energy and enters the reverse osmosis membrane heap from the power fluid water outlet after the supercharging of energy recovery lift pump, and dense water degradedness emits from low-press thick water water outlet.
The effect that can return lift pump 227 is the power loss that causes in the supplementing energy retrieving arrangement recovered energy process, its water-in links to each other with the power fluid water outlet of energy recycle device 226, water outlet links to each other with the water-in of reverse osmosis membrane stack 225, and the raw water pump that obtains energy is gone into to continue in the reverse osmosis membrane to handle.
The water-in of second strainer 228 links to each other with the water outlet of topping-up pump 221, and water outlet links to each other with the raw water inlet of energy recycle device 226, and main effect is raw water filtration.
Also be provided with second valve 229 between second strainer 228 and between the topping-up pump 221.
Because be provided with strainer in the reverse osmosis desalination device, fresh water exchange system 21 directly links to each other with second strainer 228 of energy recycle device, make fresh water directly through the filtration of second strainer 228, thereby need not in the fresh water exchange system, to be equipped with strainer.
Fresh water exchange system 21 links to each other with the raw water inlet of energy recycle device by second strainer 228, fresh water exchange system 21, second strainer 228, the former water side of energy recycle device 226, can return lift pump 227, the dense water side of reverse osmosis membrane stack 225 and energy recycle device 226 forms fresh water displacement loop, fresh water enters second strainer 228 by fresh water pipeline 213, enter the former water side of energy recycle device 226 again, it is the supercharging side, under the effect that can return lift pump, enter the reverse osmosis membrane stack then, in the reverse osmosis membrane stack, realize the dense water side that fresh water displacement back enters energy recycle device by the dense water water outlet of reverse osmosis membrane stack, it is depressurised side, energy recycle device is carried out fresh water displacement back by the energy recycle device discharging, thereby realize the fresh water displacement to reverse osmosis membrane stack and energy recycle device.
When desalination by reverse osmosis device 22 comprises many cover reverse osmosis membrane stacks and corresponding energy recycle device, fresh water pipeline 213 is provided with a plurality of water outlets, link to each other with the raw water inlet of each energy recycle device respectively, and the fresh water displacement of respectively overlapping reverse osmosis membrane and energy recycle device by each fresh water displacement valve control respectively.
In the present embodiment, when existence in the fresh water pipeline 213 contains the hydrops of a large amount of microorganisms, pollute reverse osmosis membrane for avoiding hydrops, carry out the fresh water displacement after by discharge tube 215 hydrops being emitted again.Reverse osmosis desalination device working process provided by the invention is as follows:
During 22 operations of desalination by reverse osmosis device, fresh water exchange system 21 is idle;
When needs carry out fresh water when displacement, close high-pressure pump 224, can return lift pump 227, first valve 222 and second valve 229;
Open displacement water pump 212, the fresh water in the fresh water water tank 211 enters fresh water pipeline 213 via displacement water pump 212, filters the former water side that enters energy recycle device 226 then through second strainer 228 under the effect of displacement water pump 214;
Open and to return lift pump 227, fresh water through transducing by carrying out the fresh water displacement by entering reverse osmosis membrane heap 225 after returning lift pump 227 adherence pressures, water after the displacement enters through the high pressure liquid water-in of energy recycle device 226, to energy recycle device 226 replace and transducing after from the discharging of the low-press thick water outlet of energy recycle device 226.
Second kind of mode of connection as shown in Figure 2 can be saved strainer, but increased the length of fresh water transport pipe.
Referring to Fig. 3, the fresh water exchange system that Fig. 3 provides for the embodiment of the invention and the third mode of connection of reverse osmosis desalination device, wherein, 31 is the fresh water exchange system, 32 are the desalination by reverse osmosis device, and the water-in of desalination by reverse osmosis device 32 middle filtrators links to each other with the water outlet of fresh water exchange system 31 by fresh water displacement valve.
In fresh water exchange system 31,311 is the fresh water water tank, 312 is the displacement water pump that water-in links to each other with the water outlet of fresh water water tank 311,313 is the fresh water pipeline that water-in links to each other with the water outlet of displacement water pump 312, the water outlet of fresh water pipeline 313 links to each other by the water-in of the strainer in fresh water displacement valve 316 and the sea water desalinating plant 2,314 is the discharge tube that links to each other with the end of fresh water pipeline 313, and discharge tube 314 is provided with vent valves 315.In the present embodiment, except strainer was not set, fresh water exchange system 1 had same structure and function with fresh water exchange system mentioned above.
In desalination by reverse osmosis device 32,321 is topping-up pump, 322 is the strainer that water-in links to each other with the water outlet of topping-up pump 321,323 is the high-pressure pump that water-in links to each other with the water outlet of strainer 322,324 is the reverse osmosis membrane stack that water-in links to each other with the water outlet of high-pressure pump 323,325 is the energy recycle device that the high pressure liquid water-in links to each other with the dense water water outlet of reverse osmosis membrane stack 324, the raw water inlet of energy recycle device 325 links to each other with the water outlet of strainer 322, the water-in of strainer 322 links to each other with the water outlet of topping-up pump 321,326 link to each other with the power fluid water outlet of energy recycle device 325 for water-in can return lift pump, the water outlet that can return lift pump 326 links to each other with the water-in of reverse osmosis membrane stack.
Compare with desalination by reverse osmosis device shown in Figure 2, desalination by reverse osmosis device 32 middle filtrators shown in Figure 3 are centralized arrangement, be that desalination by reverse osmosis system and the corresponding energy recycle device that every cover high-pressure pump and reverse osmosis membrane stack are formed shares a strainer 322, the water-in of strainer 322 links to each other with the water outlet of topping-up pump 321, water outlet links to each other with the water-in of high-pressure pump 323 and the raw water inlet of energy recycle device 325 respectively, is realized to the filtration of the seawater that enters high-pressure pump with to the filtration of the seawater that enters energy recycle device by strainer.
The water outlet of fresh water pipeline 313 links to each other with the water-in of strainer 322 in the fresh water exchange system 31, at this moment, in the fresh water exchange system 31 strainer can be set, fresh water pumps into fresh water pipeline 313 via displacement water pump 312, entering strainer 322 by fresh water displacement valve 316 filters, enter the former water side of energy recycle device 325 again, entering reverse osmosis membrane stack 324 under the castering action that can return lift pump 326 replaces, entered the dense water side of energy recycle device 325 again by the dense water water outlet of reverse osmosis membrane stack 324, carry out behind the transducing low-press thick water out discharging from energy recycle device 325, thereby realize the fresh water displacement to reverse osmosis membrane and energy recycle device.
In the present embodiment, when existence in the fresh water pipeline 313 contains the hydrops of a large amount of microorganisms, pollute reverse osmosis membrane for avoiding hydrops, carry out the fresh water displacement after by discharge tube 314 hydrops being emitted again.
In the present embodiment, because strainer adopts the mode of centralized arrangement to arrange, the water outlet of fresh water exchange system directly links to each other with the water-in of strainer, and fresh water exchange system, high-pressure pump and energy recycle device share a strainer, save strainer, reduced Cost of seawater desalination.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. reverse osmosis seawater desalting exchange system, comprise the fresh water water tank, the displacement water pump that water-in links to each other with the water outlet of described fresh water water tank, the fresh water pipeline that water-in links to each other with the water outlet of described displacement water pump, it is characterized in that, the water outlet of described fresh water pipeline links to each other with the raw water inlet of energy recycle device in the reverse osmosis desalination device by fresh water displacement valve, fresh water exchange system, the former water side of energy recycle device, can return the dense water side composition of lift pump, reverse osmosis membrane stack and energy recovery fresh water and replaces the loop;
Described fresh water pipeline is provided with some water outlets, and described each water outlet links to each other with the raw water inlet of energy recycle device in the corresponding reverse osmosis desalination device by fresh water displacement valve respectively;
Also comprise the discharge tube that links to each other with described fresh water pipe end, described discharge tube is provided with vent valves;
Also comprise second strainer, the water-in of described second strainer links to each other with described fresh water displacement valve, and water outlet links to each other with the raw water inlet of described energy recycle device.
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