CN111634975B - Energy-saving sea water desalination process - Google Patents
Energy-saving sea water desalination process Download PDFInfo
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- CN111634975B CN111634975B CN202010489430.XA CN202010489430A CN111634975B CN 111634975 B CN111634975 B CN 111634975B CN 202010489430 A CN202010489430 A CN 202010489430A CN 111634975 B CN111634975 B CN 111634975B
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- reverse osmosis
- inlet
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- 239000013535 sea water Substances 0.000 title claims abstract description 32
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 377
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000012528 membrane Substances 0.000 claims abstract description 31
- 238000011010 flushing procedure Methods 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 28
- 239000013505 freshwater Substances 0.000 claims description 26
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 239000013589 supplement Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 230000002452 interceptive effect Effects 0.000 abstract description 2
- 239000002455 scale inhibitor Substances 0.000 abstract 1
- 238000011033 desalting Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- 239000010842 industrial wastewater Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/06—Energy recovery
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- 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 an energy-saving sea water desalination process, which comprises the following steps: 1) And (3) water preparation: the method comprises the steps of simultaneously carrying out a liquid inlet flow, a reverse osmosis flow and a liquid discharge flow by means of a triple-bundling energy recovery machine with three cavities, wherein the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow respectively correspond to one of the three cavities in the same time period, and each cavity is internally and circularly and alternately subjected to the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow, or the reverse osmosis flow, the liquid discharge flow and the liquid inlet flow, or the liquid discharge flow, the liquid inlet flow and the liquid discharge flow; 2) Flushing: and (3) after the step (1) is carried out for a preset working time, suspending water production, and entering a flushing flow to flush the reverse osmosis membrane group. The invention can realize the whole water making process without stopping, and prolong the service life of the unit; the water production is continuously carried out, and no cutoff phenomenon exists; the starting frequency of the water pump is greatly reduced, so that energy is saved and consumption is reduced; the fluid presents an interactive dynamic waveform, which can effectively avoid scaling and reduce or even cancel the use of scale inhibitor.
Description
Technical Field
The invention relates to the technical field of energy recovery of a sea water desalination or desalination system, in particular to an energy-saving sea water desalination process.
Background
The prior pressure energy compound desalination process flow comprises the following steps: each pump intermittently works and is switched by the PLC. Such a mode of operation has the following problems: 1) Each water pump is started frequently, and the service lives of the pumps and the pump seals are greatly influenced; 2) The control flow is relatively complex, and not only is the valve switched, but also the pump alternately operates; 3) The water production is discontinuous, and the flow of liquid discharge and flushing has the phenomenon of flow interruption; 4) The pump is frequently switched and the energy consumption is larger.
In addition, regarding energy recovery, no energy recovery device is used in the current small-sized sea water desalination equipment and all industrial desalination systems, and the recovery efficiency of the energy recovery device used in a large-sized sea water desalination plant is only about 90% -95%, so that a large amount of energy waste is caused. The existing energy recovery device has the following defects: 1) The efficiency is low, and the energy waste is large; 2) The production and manufacturing processes are complex, and the cost is high; 3) The function is single, and the salt content of the produced fresh water and the discharged concentrated water cannot be adjusted.
Disclosure of Invention
To overcome the above drawbacks, it would be advantageous to provide an energy efficient process for desalinating seawater that is efficient, low cost and reduces fouling.
Therefore, the invention provides an energy-saving sea water desalination process, which comprises the following steps:
1) And (3) water preparation: simultaneously carrying out a liquid inlet flow, a reverse osmosis flow and a liquid discharge flow by means of a triple bundling type energy recovery machine with three cavities, wherein the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow respectively correspond to one of the three cavities in the same time period, and each cavity is internally and circularly and alternately subjected to the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow, or the reverse osmosis flow, the liquid discharge flow and the liquid inlet flow, or the liquid discharge flow, the liquid inlet flow and the liquid discharge flow;
2) Flushing: and (3) suspending water production after the step (1) is carried out for a preset working time, and entering a flushing flow to flush the reverse osmosis membrane group.
In the invention, as the three cavities of the triple-bundling energy recovery machine can be used for simultaneously carrying out the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow, and for each cavity, the three flows can be circularly and alternately carried out, the desalination of the raw seawater can be completed only by switching the flows without stopping the whole water preparation process, and the service life of a unit used by the process is prolonged; the water production is continuously carried out, and no cutoff phenomenon exists; because the water producing process is not stopped, the starting frequency of the water pump is greatly reduced, and the energy is saved and the consumption is reduced; the deposited dirt can be washed away in time by the washing process; through the adjustment of the preset working time, the concentration of the concentrated water and the fresh water produced by the reverse osmosis module can be flexibly adjusted.
Further, the liquid inlet flow is to pump raw sea water into one of the cavities by means of a liquid inlet pump on a liquid inlet pipeline; the reverse osmosis process is to supply liquid to the reverse osmosis membrane group from one of the cavities filled with raw seawater by means of a booster pump on a reverse osmosis pipeline comprising the reverse osmosis membrane group, and to supplement liquid to the booster pump from the raw seawater by means of a high-pressure pump on a liquid supplementing pipeline at the same time, wherein fresh water flows out of the reverse osmosis membrane group into a fresh water tank, and concentrated water flows out of the reverse osmosis membrane group back into the cavity; the liquid discharge flow is to discharge liquid from one cavity filled with concentrated water by means of a liquid discharge pump on a liquid discharge pipeline; the flushing flow is to pump fresh water to the reverse osmosis membrane group by the booster pump on the fresh water flushing pipeline for flushing and then discharging.
Through the working mode, the energy can be directly recycled on site, no energy conversion exists, and the efficiency is very high and can reach 98% -99%; because the concentration of the fluid entering the reverse osmosis membrane group is always changed in each reverse osmosis process, the alternating current is similar to the alternating current to present an interactive dynamic waveform, so that the reverse osmosis membrane surface of the reverse osmosis membrane group is washed in a cross-flow manner, the scaling phenomenon is greatly weakened or even avoided, and the dosage of scale inhibition agents can be greatly reduced.
Still further, the control of the switch of each pump and each pipeline is performed by a PLC programmable controller, and each pump is not stopped during the whole water production process of the step 1).
Through combining with PLC, can nimble adjustment produce fresh water and discharge dense water salt content.
Further, after performing the rinsing process of the step 2) for a predetermined rinsing time, the steps 1) and 2) are repeated.
By this arrangement, the water making and flushing are alternated.
Still further, the above step 1) is preceded by the following water making start step:
a) Carrying out the liquid inlet flow corresponding to one cavity of the triple bundling energy recovery machine;
b) The reverse osmosis process is performed corresponding to the cavity having undergone the liquid inlet process in the step a), and the liquid inlet process is performed corresponding to the other cavity of the triple-bundled energy recovery machine.
Through this step of opening of making water for when using triple bunched energy recovery machine to make water comprehensively, three cavity can carry out one in feed liquor flow, reverse osmosis flow and the flowing back flow simultaneously and respectively.
Further, each of the above-mentioned feed flow path, the above-mentioned reverse osmosis flow path and the above-mentioned discharge flow path was operated continuously for 3 minutes.
Further, the reverse osmosis membrane module is continuously rinsed for 10 minutes in the rinsing process.
Further, the triple cluster energy recovery machine includes:
the machine body is provided with three cavities, and each cavity is provided with a liquid inlet, a liquid outlet, a liquid return port and a liquid outlet;
the liquid inlet connector is connected with the liquid inlet pipeline and is provided with a liquid inlet main interface, a liquid inlet connector body and three liquid inlet branch interfaces which are respectively communicated with the liquid inlets of the three cavities, and a liquid inlet electromagnetic valve is arranged on the liquid inlet connector body between the liquid inlet main interface and each liquid inlet branch interface;
the liquid outlet connector is connected with one end of the reverse osmosis pipeline and is provided with a liquid outlet main interface, a liquid outlet connector body and three liquid outlet sub-interfaces which are respectively communicated with the liquid outlets of the three cavities, and a liquid outlet electromagnetic valve is arranged on the liquid outlet connector body between the liquid outlet main interface and each liquid outlet sub-interface;
the liquid return connector is connected with the other end of the reverse osmosis pipeline and is provided with a liquid return main interface, a liquid return connector body and three liquid return branch interfaces which are respectively communicated with the liquid return ports of the three cavities, and a liquid return electromagnetic valve is arranged on the liquid return connector body between the liquid return main interface and each liquid return branch interface;
the liquid discharging connector is connected with the liquid discharging pipeline and is provided with a liquid discharging main connector, a liquid discharging connector body and three liquid discharging sub-connectors which are respectively communicated with liquid discharging ports of the three cavities, and a liquid discharging electromagnetic valve is arranged on the liquid discharging connector body between the liquid discharging main connector and each liquid discharging sub-connector.
The electromagnetic valve has the advantages of simple structural design, convenient use and low production cost, can effectively solve the problem that three processes are carried out in three cavities simultaneously, realizes convenient switching through the electromagnetic valve, directly recycles energy on site, has no energy conversion and has high efficiency.
Still further, the liquid inlet joint body is provided with a liquid inlet main pipe communicated with the liquid inlet main joint and three liquid inlet branch pipes respectively communicated with the liquid inlet main pipe and the three liquid inlet tapping joints, and each liquid inlet branch pipe is provided with one liquid inlet electromagnetic valve; the liquid outlet connector body is provided with a liquid outlet main pipe communicated with the liquid outlet main port and three liquid outlet branch pipes respectively communicated with the liquid outlet main pipe and the three liquid outlet branch ports, and each liquid outlet branch pipe is provided with a liquid outlet electromagnetic valve; the liquid return joint body is provided with a liquid return main pipe communicated with the liquid return main joint and three liquid return branch pipes respectively communicated with the liquid return main pipe and the three liquid return tapping ports, and each liquid return branch pipe is provided with one liquid return electromagnetic valve; the liquid draining joint body is provided with a liquid draining main pipe communicated with the liquid draining main joint and three liquid draining branch pipes respectively communicated with the liquid draining main pipe and the three liquid draining tapping ports, and each liquid draining branch pipe is provided with the liquid draining electromagnetic valve.
Still further, each of the liquid inlet branch pipes is further provided with a liquid inlet check valve between the liquid inlet solenoid valve and the liquid inlet tap; and a liquid outlet check valve is arranged between the liquid outlet electromagnetic valve and the liquid outlet main pipe on each liquid outlet branch pipe.
Further, a pressure gauge is further provided on each of the liquid inlet branch pipes between the liquid inlet check valve and the liquid inlet tap.
Still further, still be provided with inlet and outlet valve on each above-mentioned liquid return branch pipe between liquid return solenoid valve and liquid return tapping mouth. Or, an air inlet and outlet valve communicated with the corresponding cavity is arranged on the highest position of the machine body corresponding to each cavity.
Still further, the intake and exhaust valves are configured to open to pressure relief when the pressure gauge reading reaches a predetermined pressure value.
Still further, each of the cavities on the machine body is provided with a safety valve communicated with the corresponding cavity, and the safety valve is a mechanical pressure relief valve.
Further, each of the above-described solenoid valves is electrically connected to an external PLC programmable controller.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
Drawings
The principles of operation of the present invention, together with the organization and further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals identify like elements:
FIG. 1 is a schematic diagram of the operation of an energy efficient desalination process according to one embodiment of the invention;
fig. 2 is a schematic perspective view of a triple cluster type energy recovery machine according to an embodiment of the present invention;
fig. 3 is a view similar to fig. 2, but showing a schematic perspective view of the triple cluster energy recovery machine of fig. 2 from another perspective.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings. However, it is to be understood that the embodiments disclosed herein are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately manner, including employing the various features disclosed herein in connection with features that may not be explicitly disclosed.
The energy-saving sea water desalting process of the invention can be used for an industrial desalting machine set (also can be called an industrial sea water desalting machine set), and the term desalting includes sea water desalting, brackish water desalting, industrial waste water desalting and the like; the term "liquid" or "liquid" as used herein includes water having a high salt content such as seawater, brackish water, industrial wastewater, etc.; the raw seawater can be replaced by water with high salt content such as raw brackish water, raw industrial wastewater and the like.
As shown in fig. 1, the energy-saving seawater desalination process according to one embodiment of the present invention comprises the steps of:
1) And (3) water preparation: the method comprises the steps of simultaneously carrying out a liquid inlet flow, a reverse osmosis flow and a liquid discharge flow by means of a triple-bundling energy recovery machine 100 with three cavities V1, V2 and V3, wherein the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow respectively correspond to one of the three cavities in the same time period T1, and the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow or the reverse osmosis flow, the liquid discharge flow and the liquid inlet flow or the liquid discharge flow are alternately carried out in each cavity in a circulating way; 2) Flushing: after the predetermined operation time T2 is performed in step 1), the water production is suspended, and the reverse osmosis membrane module 40 is rinsed by entering a rinsing process.
Wherein, the liquid inlet flow is to pump the raw sea water in the raw sea water pool 20 into one cavity by means of a liquid inlet pump M3 on a liquid inlet pipeline 2; the reverse osmosis process is to supply liquid to the reverse osmosis membrane group 40 from one cavity which is already full of raw seawater by means of a booster pump M2 on a reverse osmosis pipeline 4 containing the reverse osmosis membrane group 40, and to supplement liquid to the booster pump M2 from the raw seawater in the raw seawater tank 20 by means of a high-pressure pump M1 on a liquid supplementing pipeline 45 at the same time, fresh water flows out of the reverse osmosis membrane group 40 into a fresh water tank 41, and effluent concentrated water returns to the cavity; the liquid discharge flow is to discharge liquid from the cavity filled with the concentrated water by means of a liquid discharge pump M4 on a liquid discharge pipeline 6; the flushing process is to pump fresh water to the reverse osmosis membrane group 40 by the booster pump M2 on the fresh water flushing pipeline 8 for flushing and then discharging.
After the rinsing process of the step 2) is performed for a predetermined rinsing time T3, the step 1) and the step 2) are repeated.
It should be noted that the following water making start-up step is further provided before the step 1):
a) The liquid inlet flow is performed corresponding to one of the cavities of the triple cluster energy recovery machine 100;
b) The reverse osmosis process is performed corresponding to the cavity having undergone the liquid inlet process in the step a), and the liquid inlet process is performed corresponding to the other cavity of the triple-bundled energy recovery machine.
As shown in fig. 2 and 3, and referring to fig. 1, the triple-bundled energy recovery machine 100 includes a machine body 1, a liquid inlet joint 3 connected to a liquid inlet pipe 2, a liquid outlet joint 5 connected to one end of a reverse osmosis pipe 4, a liquid return joint 7 connected to the other end of the reverse osmosis pipe 4, and a liquid discharge joint 9 connected to a liquid discharge pipe 6. The three cavities of the machine body 1 comprise a first cavity V1, a second cavity V2 and a third cavity V3 (see fig. 1), and each cavity is provided with a liquid inlet, a liquid outlet, a liquid return port and a liquid outlet (not shown).
As shown in fig. 2 and 3, and in combination with fig. 1, the liquid inlet joint 3 has a liquid inlet joint body, three liquid inlet tap ports 31 respectively communicating with the liquid inlet ports of the above-mentioned three cavities, and a liquid inlet total port 33 communicating with the three liquid inlet tap ports 31, and the liquid inlet total port 33 is connected with the liquid inlet pipe 2. Wherein, a liquid inlet electromagnetic valve is arranged between the liquid inlet main interface 33 and each liquid inlet tap interface 31 on the liquid inlet connector body, and the liquid inlet electromagnetic valves corresponding to the first cavity V1, the second cavity V2 and the third cavity V3 are respectively marked as X1, X2 and X3; the liquid inlet joint body is provided with a liquid inlet main pipe 34 communicated with a liquid inlet main port 33 and three liquid inlet branch pipes 32 respectively communicated with the liquid inlet main pipe 34 and the three liquid inlet branch ports 31. The liquid inlet solenoid valves X1, X2, X3 are provided on the corresponding liquid inlet branch pipes 32, respectively. In addition, as shown in fig. 2 and referring to fig. 1, a liquid inlet check valve C1, C2, C3 is further provided on each liquid inlet manifold 32 between the liquid inlet solenoid valves X1, X2, X3 and the liquid inlet tap 31. As shown in fig. 2 and 3, pressure gauges P1, P2, and P3 are further provided on each of the intake runners 32 between the intake check valves C1, C2, and C3 and the intake tap 31, respectively. Alternatively, in other embodiments, the pressure gauges P1, P2 and P3 may be directly provided on the body 1 corresponding to the first, second and third cavities V1, V2 and V3, see fig. 1.
As shown in fig. 2 and 3, the liquid outlet connector 5 has a liquid outlet connector body, three liquid outlet ports (not shown) respectively communicated with the liquid outlets of the three cavities, and a liquid outlet total port 53 communicated with the three liquid outlet ports, and the liquid outlet total port 53 is connected with one end of the reverse osmosis pipeline 4. Wherein, a liquid outlet electromagnetic valve is arranged between the liquid outlet main interface 53 and each liquid outlet sub-interface on the liquid outlet connector body, and the liquid outlet electromagnetic valves corresponding to the first cavity V1, the second cavity V2 and the third cavity V3 are respectively marked as X4, X5 and X6; the liquid outlet connector body is provided with a liquid outlet main pipe 54 communicated with the liquid outlet main port 53, and three liquid outlet branch pipes 52 respectively communicated with the liquid outlet main pipe 54 and the three liquid outlet tap ports. The liquid outlet solenoid valves X4, X5, and X6 are respectively provided on the corresponding liquid outlet branch pipes 52. In addition, as shown in fig. 2, a liquid outlet check valve C4, C5, C6 is provided on each liquid outlet branch pipe 52 between the liquid outlet solenoid valves X4, X5, X6 and the liquid outlet main pipe 54.
As shown in fig. 2 and 3, in combination with fig. 1, the liquid return joint 7 has a liquid return joint body, three liquid return sub-ports 71 respectively communicating with the liquid return ports of the above three chambers, and a liquid return total port 73 communicating with the three liquid return sub-ports 71, the liquid return total port 73 being connected to the other end of the reverse osmosis pipeline 4. Wherein, a liquid return electromagnetic valve is arranged between the liquid return main interface 73 and each liquid return tapping port 71 on the liquid return connector body, and the liquid return electromagnetic valves corresponding to the first cavity V1, the second cavity V2 and the third cavity V3 are respectively marked as X7, X8 and X9; the return joint body has a return main pipe 74 communicating with the return main port 73, and three return branch pipes 72 communicating with the return main pipe 74 and the three return branch ports 71, respectively. The liquid return solenoid valves X7, X8, and X9 are provided on the corresponding liquid return branch pipes 72, respectively. As shown in fig. 1, an air inlet and outlet valve S1 corresponding to the first cavity V1, an air inlet and outlet valve S2 corresponding to the second cavity V2, and an air inlet and outlet valve S3 corresponding to the third cavity V3 are disposed on the machine body 1 at the highest position corresponding to each of the cavities. These intake and exhaust valves S1, S2, S3 are arranged to open for pressure relief when the corresponding pressure gauges P1, P2, P3 read a predetermined pressure value. Specifically, in the present embodiment, the intake and exhaust valves S1 to S3 may be provided on the three return branch pipes 72, respectively, as shown in fig. 2.
As shown in fig. 2 and 3, the liquid discharge joint 9 has a liquid discharge joint body, three liquid discharge sub-ports (not shown) respectively communicating with the liquid discharge ports of the above-mentioned three chambers, and a liquid discharge main port 93 communicating with the three liquid discharge sub-ports, and the liquid discharge main port 93 is connected with the liquid discharge pipe 6. Wherein, a liquid discharge electromagnetic valve is arranged between the liquid discharge main joint 93 and each liquid discharge sub joint on the liquid discharge joint body, and the liquid discharge electromagnetic valves corresponding to the first cavity V1, the second cavity V2 and the third cavity V3 are respectively marked as X10, X11 and X12; the liquid discharge joint body has a liquid discharge main pipe 94 communicating with the liquid discharge main port 93, and three liquid discharge branch pipes 92 communicating with the liquid discharge main pipe 94 and the three liquid discharge branch ports 91, respectively. The drain solenoid valves X10, X11, and X12 are provided in the corresponding drain branch pipes 92, respectively.
In addition, as shown in fig. 3 and referring to fig. 1, in the present embodiment, one relief valve is provided in the body 1 corresponding to each of the above-mentioned cavities, that is, a relief valve A1 is provided corresponding to the first cavity V1, a relief valve A2 is provided corresponding to the second cavity V2, and a relief valve A3 is provided corresponding to the third cavity V3. In the present embodiment, these safety valves may be mechanical pressure release valves.
In addition, in the present embodiment, a manual valve is further provided for each cavity, and as shown in fig. 3, a manual valve H1 is provided for the first cavity V1, a manual valve H2 is provided for the second cavity V2, and a manual valve H3 is provided for the third cavity V3, and these manual valves can be used to empty the liquid in each cavity when the triple cluster energy recovery machine of the present embodiment is deactivated.
In the present embodiment, the PLC programmable controller (not shown) performs on-off control of each pump and each solenoid valve, so that each pump is not stopped during the entire water production process. The PLC is used for one-key starting, and the control is simple and convenient.
It should be understood that in the present embodiment, the high-pressure pump M1 is used to supplement the liquid to maintain the system pressure for normal operation, the booster pump M2 is used to supply the liquid to the reverse osmosis membrane module 40, the fresh water flows out, and the concentrated water returns to the triple-combined energy recovery machine 100. The whole flow does not need a valve to adjust the system pressure, but utilizes the flow characteristic rule of the high-pressure pump M1, the booster pump M2 and the reverse osmosis membrane group 40, and automatically adjusts the flow and the pressure of the pump through the PLC, so that the flow and the pressure are matched with the resistance characteristic of the reverse osmosis membrane group 40, and the system pressure of reverse osmosis work is met. The concentrated water with residual pressure at the outlet of the reverse osmosis membrane set 40 is recycled in situ and enters the corresponding cavity of the triple-bundling energy recycling machine 100 without energy conversion, and the energy recycling efficiency is as high as 99% -99.5%.
As shown in fig. 2 and 3, in general, in the present embodiment, the triple cluster energy recovery machine 100 includes one machine body 1, twelve solenoid valves X1 to X12, six check valves C1 to C6, three intake and exhaust valves S1 to S3, three pressure gauges P1 to P3 (which may be electric contact pressure gauges), three safety valves A1 to A3, and several piping attachments. Wherein, three cavities of the machine body 1, namely a first cavity V1, a second cavity V2 and a third cavity V3, all have the same volume; the pipelines of the electromagnetic valves X1, X4, X7 and X10 are communicated with the first cavity V1, the pipelines of the electromagnetic valves X2, X5, X8 and X11 are communicated with the second cavity V2, and the pipelines of the electromagnetic valves X3, X6, X9 and X12 are communicated with the third cavity V3; the three intake and exhaust valves S1 to S3 are arranged at the highest position of the machine body 1, although in other embodiments, the highest position of the pipeline may be arranged to facilitate intake and exhaust; meanwhile, the 3 air inlet and outlet valves S1-S3 also have the function of high-pressure protection, and when the readings of the pressure gauges P1-P3 reach the allowable values, the corresponding air inlet and outlet valves S1-S3 are opened to release pressure; the three safety valves A1-A3 have the function of ultra-high pressure protection, and when the pressure gauges P1-P3 or the corresponding air inlet and outlet valves S1-S3 are damaged, namely the high pressure protection fails, the equipment is damaged when the system pressure continues to rise, and at the moment, the safety valves are opened to release the pressure.
As shown in fig. 1, and in combination with fig. 2 and 3, in the present embodiment, the triple-bundled energy recovery machine 100 has four joints, two in and two out (the flow direction of the liquid is shown by the arrow in fig. 1), namely, a liquid inlet joint 3, a liquid outlet joint 5, a liquid return joint 7 and a liquid discharge joint 9, wherein the liquid inlet joint 3 and the liquid return joint 7 belong to two in, and the liquid outlet joint 5 and the liquid discharge joint 9 belong to two out.
As further shown in fig. 1, and referring to fig. 2 and 3, the following systematically describes the continuous water production operation of the energy-saving seawater desalination process of the present embodiment (for clarity, only the reference numerals of each cavity, each pump, each valve, etc.) are written below:
1) V1 feed: opening M3, S1 and X1, and working for 3min (adjustable) to fill V1; other pumps are not started, and other valves are closed;
2) V1 participates in reverse osmosis: opening M1, X4, M2 and X7, and working for 3min (adjustable) to prepare water; simultaneously V2 feed liquor: opening M3, S2 and X2, and working for 3min (adjustable) to fill V2; the other valves are closed;
3) V1 liquid discharge: opening M4, S1 and X10, discharging liquid for 3min (adjustable) and discharging concentrated water from V1; while V2 participates in reverse osmosis: opening M1, X5, M2 and X8, and working for 3min (adjustable) to prepare water; simultaneously V3 feed liquor: opening M3, S3 and X3, and working for 3min (adjustable) to fill V3; the other valves are closed (that is, in the same time period T1, namely, 3 minutes, the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow respectively correspond to one of the V1, the V2 and the V3);
4) V1 feed: opening M3, S1 and X1, and working for 3min (adjustable) to fill V1; simultaneously V2 liquid discharge: opening M4, S2 and X11, discharging liquid for 3min (adjustable) and discharging concentrated water from V2; while V3 participates in reverse osmosis: opening M1, X6, M2 and X9, and working for 3min (adjustable) to prepare water; the other valves are closed;
5) V1 participates in reverse osmosis: opening M1, X4, M2 and X7, and working for 3min (adjustable) to prepare water; simultaneously V2 feed liquor: opening M3, S2 and X2, and working for 3min (adjustable) to fill V2; simultaneously V3 liquid discharge: opening M4, S3 and X12, and discharging the concentrated water from V3 after 3min (adjustable); the other valves are closed;
6) Returning to point 3) above, the loop is followed.
After the water producing step works for the preset working time T2 (namely, the time of carrying out a plurality of cycles of the steps 3) to 5), water producing is suspended, and a flushing flow is automatically (or can be manually operated) carried out to flush the reverse osmosis membrane group:
7) Opening M2, X16, X17 (i.e. the water inlet solenoid valve X16 and the water outlet solenoid valve X17 arranged on the fresh water flushing pipeline 8), flushing for a predetermined flushing time T3, for example 10min (adjustable); the other valves are closed;
8) After the flushing, the above suspended working procedure is continued, namely, the above point 3) is returned, that is, the suspended working before the flushing flow is started in the water making step is continued.
It is understood that from step 3) to step 5) these water producing steps, V1 is alternately circulated to perform a liquid discharge flow path, a liquid feed flow path, and a reverse osmosis flow path; v2, alternately and circularly performing a reverse osmosis process, a liquid discharge process and a liquid inlet process; and V3, alternately and circularly carrying out a liquid inlet flow, a reverse osmosis flow and a liquid discharge flow. However, if starting from step 1), each cavity is alternately cycled through a feed flow, a reverse osmosis flow, and a drain flow. In the present embodiment, the reverse osmosis process includes a process of supplying liquid from the chamber to the reverse osmosis membrane module 40 and supplying liquid to the reverse osmosis membrane module 40 by the high pressure pump M1.
In addition, it should be understood that the above mentioned 3min and 10min can be adjusted according to the needs (for example, different units, different required fresh water and concentrated water ratios, etc.), but in the water making process, the working time of each flow of the liquid inlet, reverse osmosis and liquid discharge involved in V1, V2 and V3 is set to be the same time period, so that synchronous conversion and synchronous conversion can be performed. The energy-saving seawater desalination process of the embodiment can complete the circulation and alternation work of each flow only through the valve switching, and the water is discharged after reaching the required concentration (which can be set according to the requirement) through a plurality of circulation (namely a plurality of 3 minutes), so that the concentration of the concentrated water and the concentration of the fresh water can be flexibly adjusted in a large range, the residual pressure of the concentrated water is repeatedly utilized along with the production period of the fresh water, and the energy recovery of the system is realized.
In the present embodiment, as shown in fig. 1, the drain line 6 discharges the concentrate from each chamber into the concentrate tank 60; the fresh water flushing line 8 has an inlet end connected to the fresh water flushing tank 81 and an outlet end connected to the flushing water receiving tank 83. In addition, although the fresh water produced by the reverse osmosis membrane module 40 is received by the fresh water tank 41 in the present embodiment, the fresh water tank 41 may be replaced with a fresh water tank or directly connected to the user.
In the present embodiment, the intake pump M3 and the output pump M4 may be two independent pumps, or may be one coaxial duplex pump.
While the technical content and features of the present invention have been disclosed above, it will be understood that various changes and modifications to the above-described structure, including combinations of technical features individually disclosed or claimed herein, and other combinations of these features as apparent to those skilled in the art may be made under the inventive concept of the present invention. Such variations and/or combinations fall within the technical field to which the invention relates and fall within the scope of the claims of the invention.
Claims (6)
1. An energy-saving sea water desalination process is characterized by comprising the following steps:
1) And (3) water preparation: simultaneously carrying out a liquid inlet flow, a reverse osmosis flow and a liquid discharge flow by means of a triple bundling type energy recovery machine with three cavities, wherein the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow respectively correspond to one of the three cavities in the same time period, and each cavity is internally and circularly and alternately subjected to the liquid inlet flow, the reverse osmosis flow and the liquid discharge flow, or the reverse osmosis flow, the liquid discharge flow and the liquid inlet flow, or the liquid discharge flow, the liquid inlet flow and the liquid discharge flow;
2) Flushing: suspending water production after the step 1) is carried out for a preset working time, and entering a flushing flow to flush the reverse osmosis membrane group;
the liquid inlet flow is to pump raw sea water into one cavity by means of a liquid inlet pump on a liquid inlet pipeline; the reverse osmosis process is to supply liquid to the reverse osmosis membrane group from one cavity which is already full of raw seawater by means of a booster pump on a reverse osmosis pipeline comprising the reverse osmosis membrane group, and to supplement liquid to the booster pump from the raw seawater by means of a high-pressure pump on a liquid supplementing pipeline at the same time, wherein fresh water flows out of the reverse osmosis membrane group into a fresh water tank, and concentrated water flows out of the reverse osmosis membrane group back into the cavity; the liquid discharge flow is to discharge liquid from one cavity filled with concentrated water by means of a liquid discharge pump on a liquid discharge pipeline; the flushing flow is to pump fresh water to the reverse osmosis membrane group by using the booster pump on the fresh water flushing pipeline for flushing and then discharging;
the PLC is used for carrying out switch control on each pump and each pipeline, and each pump is not stopped in the whole water production process of the step 1);
the triple cluster energy recovery machine includes:
the machine body is provided with three cavities, and each cavity is provided with a liquid inlet, a liquid outlet, a liquid return port and a liquid outlet;
the liquid inlet connector is connected with the liquid inlet pipeline and is provided with a liquid inlet main interface, a liquid inlet connector body and three liquid inlet branch interfaces which are respectively communicated with the liquid inlet ports of the three cavities, and a liquid inlet electromagnetic valve is arranged on the liquid inlet connector body between the liquid inlet main interface and each liquid inlet branch interface;
the liquid outlet connector is connected with one end of the reverse osmosis pipeline and is provided with a liquid outlet main interface, a liquid outlet connector body and three liquid outlet sub-interfaces which are respectively communicated with the liquid outlets of the three cavities, and a liquid outlet electromagnetic valve is arranged on the liquid outlet connector body between the liquid outlet main interface and each liquid outlet sub-interface;
the liquid return connector is connected with the other end of the reverse osmosis pipeline and is provided with a liquid return main interface, a liquid return connector body and three liquid return branch interfaces which are respectively communicated with the liquid return ports of the three cavities, and a liquid return electromagnetic valve is arranged on the liquid return connector body between the liquid return main interface and each liquid return branch interface;
the liquid discharging connector is connected with the liquid discharging pipeline and is provided with a liquid discharging main connector, a liquid discharging connector body and three liquid discharging sub-connectors which are respectively communicated with liquid discharging ports of the three cavities, and a liquid discharging electromagnetic valve is arranged on the liquid discharging connector body between the liquid discharging main connector and each liquid discharging sub-connector;
the liquid inlet joint body is provided with a liquid inlet main pipe communicated with the liquid inlet main joint and three liquid inlet branch pipes respectively communicated with the liquid inlet main pipe and the three liquid inlet tapping ports, and each liquid inlet branch pipe is provided with one liquid inlet electromagnetic valve; the liquid outlet connector body is provided with a liquid outlet main pipe communicated with the liquid outlet main interface and three liquid outlet branch pipes respectively communicated with the liquid outlet main pipe and the three liquid outlet tap openings, and each liquid outlet branch pipe is provided with a liquid outlet electromagnetic valve; the liquid return joint body is provided with a liquid return main pipe communicated with the liquid return main joint and three liquid return branch pipes respectively communicated with the liquid return main pipe and the three liquid return tapping ports, and each liquid return branch pipe is provided with one liquid return electromagnetic valve; the liquid draining joint body is provided with a liquid draining main pipe communicated with the liquid draining main joint and three liquid draining branch pipes respectively communicated with the liquid draining main pipe and the three liquid draining tapping ports, and each liquid draining branch pipe is provided with one liquid draining electromagnetic valve.
2. The energy-saving seawater desalination process of claim 1, wherein the steps 1) and 2) are repeated after performing the rinsing process of the step 2) for a predetermined rinsing time.
3. An energy efficient desalination process according to claim 2 further comprising, prior to step 1), the step of starting the process of:
a) The liquid inlet flow is carried out corresponding to one cavity of the triple bundling energy recovery machine;
b) And c), performing the reverse osmosis process corresponding to the cavity in which the liquid inlet process is performed in the step a), and performing the liquid inlet process corresponding to the other cavity of the triple bundling energy recovery machine.
4. An energy efficient desalination process according to any one of claims 1-3 wherein each of the feed flow path, reverse osmosis flow path and discharge flow path is operated for 3 minutes.
5. An energy efficient desalination process according to any one of claims 1-3 wherein the reverse osmosis membrane module is continuously flushed for 10 minutes in the flushing sequence.
6. The energy-saving seawater desalination process of claim 1, wherein each of the liquid inlet branch pipes is further provided with a liquid inlet check valve between the liquid inlet solenoid valve and the liquid inlet tap; and a liquid outlet check valve is arranged between the liquid outlet electromagnetic valve and the liquid outlet main pipe on each liquid outlet branch pipe.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2363741B (en) * | 2000-06-20 | 2004-08-11 | Finch Internat Ltd | Energy recovery system |
| JP2014136186A (en) * | 2013-01-16 | 2014-07-28 | Ebara Corp | Seawater desalination system and energy recovery apparatus |
| CN104961194A (en) * | 2015-06-03 | 2015-10-07 | 燕山大学 | Reverse osmosis desalination system energy recovery and recycle device and use method thereof |
| CN105073230A (en) * | 2013-03-11 | 2015-11-18 | 株式会社荏原制作所 | Seawater desalination system and energy recovery apparatus |
| CN110526339A (en) * | 2019-09-11 | 2019-12-03 | 上海瑜科环境工程有限公司 | The compound desalinating process of pressure energy |
-
2020
- 2020-06-02 CN CN202010489430.XA patent/CN111634975B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2363741B (en) * | 2000-06-20 | 2004-08-11 | Finch Internat Ltd | Energy recovery system |
| JP2014136186A (en) * | 2013-01-16 | 2014-07-28 | Ebara Corp | Seawater desalination system and energy recovery apparatus |
| CN105073230A (en) * | 2013-03-11 | 2015-11-18 | 株式会社荏原制作所 | Seawater desalination system and energy recovery apparatus |
| CN104961194A (en) * | 2015-06-03 | 2015-10-07 | 燕山大学 | Reverse osmosis desalination system energy recovery and recycle device and use method thereof |
| CN110526339A (en) * | 2019-09-11 | 2019-12-03 | 上海瑜科环境工程有限公司 | The compound desalinating process of pressure energy |
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