CN109250833B - Membrane method sea water desalination traction push-pull type integrated laminating device - Google Patents
Membrane method sea water desalination traction push-pull type integrated laminating device Download PDFInfo
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- CN109250833B CN109250833B CN201811278546.8A CN201811278546A CN109250833B CN 109250833 B CN109250833 B CN 109250833B CN 201811278546 A CN201811278546 A CN 201811278546A CN 109250833 B CN109250833 B CN 109250833B
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- 239000013535 sea water Substances 0.000 title claims abstract description 209
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 43
- 239000012528 membrane Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010030 laminating Methods 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 27
- 239000012267 brine Substances 0.000 claims description 32
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 32
- 238000003475 lamination Methods 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000007750 plasma spraying Methods 0.000 claims description 5
- XZPVPNZTYPUODG-UHFFFAOYSA-M sodium;chloride;dihydrate Chemical compound O.O.[Na+].[Cl-] XZPVPNZTYPUODG-UHFFFAOYSA-M 0.000 claims description 5
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 3
- 239000011224 oxide ceramic Substances 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 2
- 238000005524 ceramic coating Methods 0.000 claims 1
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- 238000006073 displacement reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000013505 freshwater Substances 0.000 description 7
- 239000010720 hydraulic oil Substances 0.000 description 7
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- 230000001360 synchronised effect Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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- 239000003921 oil Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
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- 238000004891 communication Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000035622 drinking Effects 0.000 description 2
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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- 238000011160 research Methods 0.000 description 2
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- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—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
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- 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
- B01D61/08—Apparatus therefor
-
- 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
- B01D61/10—Accessories; Auxiliary operations
-
- 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
- B01D61/12—Controlling or regulating
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/2649—Filtration
-
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/005—Valves
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
-
- 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
- C02F2303/10—Energy recovery
-
- 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
-
- 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
- Y02A20/138—Water desalination using renewable energy
- Y02A20/144—Wave energy
Abstract
The invention relates to the technical field of sea water desalination, in particular to a membrane method sea water desalination traction push-pull type integrated laminating device. Including water pump, pressure transducer, reverse osmosis membrane group, still be provided with sea water supply portion and gearless traction machine, water pump, sea water supply portion, pressure transducer connect gradually, pressure transducer includes first sea water jar and second sea water jar, the first sea water piston both sides of first sea water jar are provided with piston rod and first traction piston rod respectively, the second sea water piston both sides of second sea water jar are provided with piston rod and second traction piston rod respectively, first traction piston rod and second traction piston rod are through gearless traction machine traction lift. The system reliability is improved, and the maintenance cost is low. The system has strong adaptability and flexible load adjustment.
Description
Technical Field
The invention relates to the technical field of sea water desalination, in particular to a membrane method sea water desalination traction push-pull type integrated laminating device.
Background
There are two common methods, namely a thermal method and a membrane method, for sea water desalination. Among them, the technology of sea water desalination by membrane method using reverse osmosis membrane is widely used due to low cost and low energy consumption, and gradually becomes the main stream.
In the sea water desalination system, the pretreated sea water with lower salt content entering the desalination system is raw sea water, high-pressure raw sea water is formed after pressurization, part of the sea water is low-pressure fresh water after passing through a reverse osmosis membrane group, the rest sea water is high-pressure strong brine, and the sea water is discharged after energy recovery and pressure energy release.
The technology comprises three main core components: reverse osmosis membrane, high-pressure pump and energy recovery device. The high-pressure pump increases the pressure of the raw seawater to 5-7 MPa, so that about 40% of fresh water permeates the reverse osmosis membrane, and the rest about 60% of strong brine still has about 4-6 MPa of pressure potential energy, and the strong brine needs to be transferred into the raw seawater through an energy recovery system, so that the total energy consumption is reduced.
How to reduce the investment cost, the operation cost and the energy consumption of the high-pressure pump and the energy recovery device is the key of the technology. The sum of the two costs is about 1/3 of the total investment cost, the electricity consumption is more than 2/3 of the total electricity consumption, the electricity consumption cost is more than 1/3 of the operation cost, the ton electricity consumption of the fresh water produced by the method is 3.5kWh currently, and the limit electricity consumption is about 2.5kWh under the existing film technology level, and the energy-saving space is still 1/3.
The high-pressure pump used in the reverse osmosis sea water desalination engineering in China at present mainly comprises an imported multistage centrifugal pump and a reciprocating system.
The multistage centrifugal pump drives fluid to rotate through impeller blades rotating at high speed, the fluid is thrown out under the action of centrifugal force, and liquid with higher pressure can be conveyed through adopting a multistage structure. The current multistage centrifugal pump for sea water desalination is mainly divided into three levels of middle open: the applicable flow rate of the multistage centrifugal pump is more than 220m 3 In the occasion of/h, the highest efficiency can reach 75-85%, and the structure is generally larger; the flow range of the segmental multistage centrifugal pump is 80-220 m 3 And/h, the efficiency is 65-80%, and the volume is smaller; the normal flow rate of the stainless steel stamping pump is not more than 95m 3 /h, but the efficiency is generally less than 70%.
The output flow rate of the multistage centrifugal pump is large and stable, but the working efficiency is low compared with that of the positive displacement pump, and decreases with the increase of pressure. Currently, manufacturers of multistage centrifugal high-pressure pumps for sea water desalination include German KSB company, switzerland Sulzer company, denmark Grounfos company, and the like. Because the pump has relatively high efficiency when the flow is large, the pump is not economical to use in a small and medium-sized sea water desalination system from the viewpoint of reducing energy consumption.
The reciprocating pump belongs to a positive displacement pump, and periodically increases and decreases the internal working volume through the reciprocating motion of a piston in a body, and conveys high-pressure liquid through the corresponding closing and opening actions of a one-way valve. The rated flow rate of the reciprocating pump is generally not more than 120m 3 And/h, the efficiency is generally more than 85% because of the positive displacement pump, but the output flow has pulsation characteristic under the influence of the inherent structure. Currently, manufacturers of reciprocating high-pressure pumps for sea water desalination mainly comprise CAT company in America, MYERS company in America and the like. The reciprocating pump has the advantages of complex structure, large volume, high working efficiency and stable efficiency under different pressure levelsIs suitable for being used in small and medium-sized sea water desalination systems.
In recent years, with the development of water hydraulic technology, danfoss corporation, denmark, which has been engaged in the manufacture of water hydraulic components, has developed a series of high-pressure axial plunger pumps for sea water desalination. The series of pumps are axial plunger structures with end face flow distribution, and have good self-absorption capacity, so that the pumps can work at a high rotating speed, and a pump with a small volume can output a large flow. The key friction pair of the series of pumps is directly lubricated by seawater, so that the maintenance is good, and pollution caused by grease leakage is avoided.
The end face flow distribution sea water desalination high-pressure axial plunger pump is characterized in that the pressure in a plunger cavity and the suction and discharge flow dynamically change along with the rotation of a cylinder body due to the influence of periodical flow distribution in the working process, and the abrupt change of the pressure in the plunger cavity is a main source of pump vibration and noise. The high-speed rotation of fluid and the reciprocating motion of the plunger in the working process of the seawater desalination high-pressure axial plunger pump enable the flowing area of water in the pump to be changed continuously, and the low viscosity of seawater (the viscosity of the seawater is only about 1/50-1/40 of that of hydraulic oil) enables most of the flowing area to be in a fully developed turbulent flow state, so that the seawater is in complex unsteady turbulent cavitation flow in the pump.
Therefore, the design theory and method of the axial plunger pump using hydraulic oil as a medium cannot be fully applied to the seawater hydraulic axial plunger pump, and research and discussion are required based on the characteristics of the seawater medium. The practical use of engineering proves that the service life of the seawater axial plunger pump of foreign brands is about three years. The service life of the domestic brand seawater axial plunger pump is about one year. If the APP pump is required to have prefilter, pressure and rotating speed conditions specified by manufacturers, the operation of the pump can be ensured to have the operation time of at least 8000 hours.
At present, two high-pressure pumps for sea water desalination are available, one is a piston type, and a crank-link mechanism is adopted to convert the power of motor rotation into the linear motion of a piston in a cylindrical cylinder body so as to pressurize sea water; the structure has higher efficiency, the pump efficiency can reach more than 80%, but the flow is not stable enough, the pressure fluctuation is obvious, the valve control is adopted and is limited by the length of the crank connecting rod, so that the reversing frequency is high, the vibration and the noise are large, and the failure rate of the control valve and the sealing piece is higher. The other is a centrifugal water pump, the water pressure is increased by the centrifugal force generated by the rotation of the multistage rotor, the flow is large and stable, valve control is not needed, but the efficiency is lower, the pump efficiency is usually lower than 80%, and the average is about 75%. Due to the strong corrosiveness and low viscosity characteristics of seawater, both the support and the flow-through parts of the two pumps need high-quality corrosion-resistant and wear-resistant materials, such as copper alloy, dual-phase steel and even ceramic materials, and the manufacturing cost is very high.
At present, two energy recovery devices for sea water desalination are available, one is based on the principle of a hydraulic turbine, and high-pressure strong brine pushes the turbine to rotate so as to pressurize raw sea water, so that no flow control is needed, a booster pump is not needed, and the flow is stable and continuous; but the two conversion of the concentrated seawater pressure potential energy, the shaft rotation mechanical energy and the original seawater pressure potential energy are needed, the recovery efficiency is low and can only reach 60 percent, and the recovery efficiency is eliminated gradually. The other is based on the pressure exchange principle, namely, the high-pressure strong brine directly transmits pressure potential energy to the original seawater through a flow distribution mechanism in a cylindrical cylinder body, so that the transmission efficiency is very high, and the energy recovery efficiency can reach more than 90%; according to different flow distribution modes, the valve flow distribution structure can be subdivided into a piston-free structure for flow distribution of the end face of the rotary cylinder body and a valve flow distribution structure with a piston of the fixed cylinder body; the end face of the rotary cylinder body is provided with a flow distribution piston-free structure (for example, PX series products of certain company in the United states), the structure is simple, but 25% of the materials are mixed, an independent booster pump is needed, and the overall efficiency is reduced; the valve flow distribution structure with the piston of the fixed cylinder body does not need to be provided with a booster pump, so that the efficiency is higher, but the control mechanism is more complex. The related patents at home and abroad are all based on the technical solutions.
Therefore, the inventor proposes a traction push-pull integrated lamination device by virtue of related design and manufacturing experience for many years so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adapt to the actual needs and provide a membrane method sea water desalination traction push-pull type integrated laminating device.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: the utility model provides a membrane method sea water desalination pulls push-pull formula integration pressure-superposed device, includes water pump, pressure transducer, reverse osmosis membrane group, still is provided with sea water supply portion and gearless traction machine, water pump, sea water supply portion, pressure transducer connect gradually, pressure transducer includes first sea water jar and second sea water jar, the first sea water piston both sides of first sea water jar are provided with the piston rod respectively and first traction piston rod, the second sea water piston both sides of second sea water jar are provided with piston rod and second traction piston rod respectively, first traction piston rod and second traction piston rod are through gearless traction machine traction lift. The seawater cylinder at one side of the first traction piston rod of the first seawater cylinder is respectively communicated with the reverse osmosis membrane group and the original seawater filter through a seawater supply part; the seawater cylinder at one side of the piston rod of the first seawater cylinder is respectively communicated with one side of a two-position four-way reversing valve, and the other side of the two-position four-way reversing valve is respectively communicated with a low-pressure strong brine water outlet and high-pressure strong brine; the seawater cylinder at one side of the second traction piston rod of the second seawater cylinder is respectively communicated with the reverse osmosis membrane group and the original seawater filter through a seawater supply part; the seawater cylinder at one side of the piston rod of the second seawater cylinder is respectively communicated with one side of a two-position four-way reversing valve, and the other side of the two-position four-way reversing valve is respectively communicated with a low-pressure strong brine water outlet and high-pressure strong brine; the first seawater piston, the second seawater piston, the water feeding pump, the gearless traction machine and the two-position four-way reversing valve are controlled by a control system. The gearless machine system is compared with a geared system: the volume of the traction machine can be reduced by 60%, and the transmission efficiency of the whole equipment is improved by 30%. Compared with a hydraulic power system: the hydraulic motor, the hydraulic oil tank, the cooler, the filter, the pressure-adjustable electric control overflow valve, the liquid level sensor or the liquid level indicator, the connecting pipeline, the valve and the like are reduced, the system volume is reduced by 50%, and the transmission efficiency of the whole equipment is further improved.
The cylinder bodies, the pistons and the piston rods of the first seawater piston cylinder and the second seawater piston cylinder are made of seawater corrosion resistant materials; unlike conventional cylinders, the composite seawater cylinder has very high corrosion resistance, all parts are made of duplex stainless steel, and no welding structure exists. In order to meet the requirement of continuous operation of the seawater cylinder at high frequency (24 hours), the surface of the piston rod and the inner hole of the cylinder barrel are both coated with APS (plasma spraying) oxide ceramic, so that the wear resistance and corrosion resistance of the cylinder body are greatly improved. In addition, the cylinder body also adopts a special sealing structure and a special sealing material, and can be effectively applied to seawater media and effectively scrape crystals and sediments on hardware caused by the seawater media on the premise of ensuring the sealing performance, the running speed and the frequency of the seawater cylinder; meanwhile, the sealing material also needs to meet the requirements of FDA authentication (food grade), ensure that the water quality is pollution-free and meet the requirements of drinking grade.
The control system is provided with an industrial Ethernet interface (an expandable industrial Ethernet module), and is communicated with a central control room on one hand to realize the SCADA monitoring function of sea water desalination; on the other hand, the system can be connected with an industrial touch screen to realize on-site monitoring. The control unit is provided with an analog input module to realize data acquisition of pressure and flow of low-pressure raw water, high-pressure raw water, strong brine and fresh water. The control unit forms master-slave communication with the traction frequency converter (shown in figure 2) through a field bus, so that the safety protection and automatic control of the traction motor are realized. In addition, the first control switch, the second control switch, the third control switch and the first four control switches also participate in the safety protection system of the traction system.
The upper parts of two sides of the gearless traction machine are respectively provided with a first fixed pulley and a second fixed pulley, and the gearless traction machine drives the first seawater piston and the second seawater piston to drag and lift through the first fixed pulley and the second fixed pulley respectively.
The two sides of the gearless traction machine are respectively provided with a first movable pulley and a second movable pulley, and the gearless traction machine drives the first seawater piston and the second seawater piston to drag and lift through the first movable pulley and the second movable pulley.
The two-position four-way regulating valve solves the problem of poor synchronism when a plurality of valves are operated in a combined mode. The driving device adopts motor control and can be made into a plunger control valve or a rotary control valve. The plunger control valve can be operated at a faster switching speed without causing large hydraulic shock to the desalination system. The valve is mainly composed of two coaxial pistons and a cylindrical barrel, wherein the pistons do linear reciprocating motion in the barrel under the drive of a permanent magnet synchronous linear motor. The reliability of the device is improved, and meanwhile, the system maintenance requirement is greatly reduced. When the rotary control valve is in a specific working position, the corresponding hydraulic cylinder is communicated with high-pressure brine, the high-pressure brine transmits static pressure to the original seawater, the hydraulic cylinder carries out a pressurizing process, and meanwhile, in the other hydraulic cylinder, under the pushing of the original seawater, the pressure-released brine is discharged through a pressure-released brine opening of the rotary valve. The control system can detect the position and the speed of the piston through a rotary encoder in the traction system, and drives the four-way regulating valve motor according to a piston in-place signal to realize the working position conversion of the rotary valve, so that the hydraulic cylinder alternately realizes the pressure increasing and releasing process, and the continuity of pressurized seawater supply is ensured.
And a filter is arranged on a pipeline connected with the seawater supply part of the water feeding pump.
The pipeline that sea water supply portion and reverse osmosis membrane group communicate is provided with first energy storage ware, is provided with second energy storage ware and first valve on the pipeline that two-position four-way reversing valve 610 and reverse osmosis membrane group communicate, is provided with the second valve on the pipeline that two-position four-way reversing valve and outlet are connected.
The invention has the beneficial effects that:
1. the cost of the pressurizing and energy recycling system is reduced by more than 20%, and the equipment price of 1000 tons of water produced in daily life is lower than 100 ten thousand yuan.
2. The electricity consumption of the seawater reverse osmosis unit is reduced by more than 15 percent, and the electricity consumption per ton of water reaches 1.8-2.3kwh, and reaches or exceeds the international advanced level.
3. The system reliability is improved, and the maintenance cost is low.
4. The system has strong adaptability and flexible load adjustment.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a membrane type seawater desalination traction push-pull integrated lamination device;
FIG. 2 is a schematic diagram of a traction motor control circuit in a membrane type sea water desalination traction push-pull integrated lamination device;
FIG. 3 is a schematic diagram showing the placement mode of a traction machine in a membrane type seawater desalination traction push-pull integrated lamination device;
FIG. 4 is a schematic diagram of the placement mode of a traction machine in a membrane type seawater desalination traction push-pull integrated lamination device;
FIG. 5 is a plot of suspension velocity and acceleration.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
see fig. 1-5.
The invention discloses a membrane method sea water desalination traction push-pull type integrated laminating device, which comprises a water supply pump 20, a pressure transducer 63 and a reverse osmosis membrane group 50, and is characterized in that: still be provided with sea water supply portion 64 and gearless traction machine 10, water pump 20, sea water supply portion 64, pressure transducer 63 connect gradually, pressure transducer 63 includes first sea water jar 631-1 and second sea water jar 631-2, the first sea water piston 63121 both sides of first sea water jar 6311 are provided with piston rod 63141 and first traction piston rod 63131 respectively, the second sea water piston 63122 both sides of second sea water jar 6312 are provided with piston rod 63142 and second traction piston rod 63122 respectively, first traction piston rod 63121 and second traction piston rod 63122 are through gearless traction machine traction lift. The first seawater cylinder 6311 is connected to the reverse osmosis membrane module 50 and the raw seawater filter 64 via a seawater supply part 64, respectively, to the seawater cylinder on the first traction piston rod 63121 side; the seawater cylinder at one side of the first piston rod 63141 of the first seawater cylinder 6311 is respectively communicated with one side of the two-position four-way reversing valve 610, and the other side of the two-position four-way reversing valve is respectively communicated with the low-pressure strong brine outlet 70 and the high-pressure strong brine 61; the second seawater cylinder 6312 is connected to the reverse osmosis membrane module 50 and the raw seawater filter 64 via a seawater supply part 64, respectively, to the seawater cylinder on the side of the second traction piston rod 63122; the sea water cylinder at one side of the second piston rod 63142 of the second sea water cylinder 631-2 is respectively communicated with one side of the two-position four-way reversing valve 610, and the other side of the two-position four-way reversing valve 610 is respectively communicated with the low-pressure strong brine outlet 70 and the high-pressure strong brine 61; the first seawater piston 63121, the second seawater piston 63122, the water pump 20, the gearless traction machine 10 and the two-position four-way reversing valve 610 are all controlled by the control system 100. The gearless machine system 10 is compared to a geared system: the volume of the traction machine can be reduced by 60%, and the transmission efficiency of the whole equipment is improved by 30%. Compared with a hydraulic power system: the hydraulic motor, the hydraulic oil tank, the cooler, the filter, the pressure-adjustable electric control overflow valve, the liquid level sensor or the liquid level indicator, the connecting pipeline, the valve and the like are reduced, the system volume is reduced by 50%, and the transmission efficiency of the whole equipment is further improved.
The cylinder bodies, the pistons and the piston rods of the first seawater piston cylinder 6311 and the second seawater piston cylinder 6312 are made of seawater corrosion resistant materials; unlike conventional cylinders, the composite seawater cylinder has very high corrosion resistance, all parts are made of duplex stainless steel, and no welding structure exists. In order to meet the requirement of continuous operation of the seawater cylinder at high frequency (24 hours), the surface of the piston rod and the inner hole of the cylinder barrel are both coated with APS (plasma spraying) oxide ceramic, so that the wear resistance and corrosion resistance of the cylinder body are greatly improved. In addition, the cylinder body also adopts a special sealing structure and a special sealing material, and can be effectively applied to seawater media and effectively scrape crystals and sediments on hardware caused by the seawater media on the premise of ensuring the sealing performance, the running speed and the frequency of the seawater cylinder; meanwhile, the sealing material also needs to meet the requirements of FDA authentication (food grade), ensure that the water quality is pollution-free and meet the requirements of drinking grade.
The control system 100 is provided with an industrial Ethernet interface (an expandable industrial Ethernet module), and is communicated with a central control room on one hand to realize the SCADA monitoring function of sea water desalination; on the other hand, the system can be connected with an industrial touch screen to realize on-site monitoring. The control unit is provided with an analog input module to realize data acquisition of pressure and flow of low-pressure raw water, high-pressure raw water, strong brine and fresh water. The control unit forms master-slave communication with the traction frequency converter (shown in figure 2) through a field bus, so that the safety protection and automatic control of the traction motor are realized. The first control switch 651, the second control switch 652, the third control switch 653, and the first fourth control switch 654 also participate in the safety protection system of the traction system.
The upper sides of the two sides of the gearless traction machine 10 are respectively provided with a first fixed pulley 101 and a second fixed pulley 102, and the gearless traction machine 10 drives the first seawater piston 63121 and the second seawater piston 63122 to drag and lift through the first fixed pulley 101 and the second fixed pulley 102 respectively.
A first movable pulley 103 and a second movable pulley 104 are respectively arranged below two sides of the gearless traction machine 10, and the gearless traction machine 10 drives the first seawater piston 63121 and the second seawater piston 63122 to drag and lift through the first movable pulley 103 and the second movable pulley 104 respectively.
The two-position, four-way regulator valve 610 eliminates the problem of poor synchronicity when multiple valves are operated in combination. The driving device adopts motor control and can be made into a plunger control valve or a rotary control valve. The plunger control valve can be operated at a faster switching speed without causing large hydraulic shock to the desalination system. The valve is mainly composed of two coaxial pistons and a cylindrical barrel, wherein the pistons do linear reciprocating motion in the barrel under the drive of a permanent magnet synchronous linear motor. The reliability of the device is improved, and meanwhile, the system maintenance requirement is greatly reduced. When the rotary control valve is in a specific working position, the corresponding hydraulic cylinder is communicated with high-pressure brine, the high-pressure brine transmits static pressure to the original seawater, the hydraulic cylinder carries out a pressurizing process, and meanwhile, in the other hydraulic cylinder, under the pushing of the original seawater, the pressure-released brine is discharged through a pressure-released brine opening of the rotary valve. The control system can detect the position and the speed of the piston through a rotary encoder in the traction system, and the control system drives the motor according to a piston in-place signal to realize the conversion of the working position of the rotary valve, so that the hydraulic cylinder alternately realizes the pressure increasing and releasing process, and the continuity of pressurized seawater supply is ensured.
The filter 30 is provided in a pipe connecting the water pump 20 and the seawater supply unit 64.
The first accumulator 40 is arranged on the pipeline of the seawater supply part 64 communicated with the reverse osmosis membrane set 50, the second accumulator 60 and the first valve 61 are arranged on the pipeline of the two-position four-way reversing valve 610 communicated with the reverse osmosis membrane set 50, and the second valve 70 is arranged on the pipeline of the two-position four-way reversing valve 610 connected with the water outlet.
The invention simultaneously completes three functions of a high-pressure sea water pump, a booster pump and an energy recovery device through a pair of sea water piston cylinders, adopts traction drive to supplement the energy required by sea water desalination, and adopts liquid-liquid exchange to realize the recovery of pressure energy.
The key innovation point of the scheme is that the water hydraulic pressurizing technology (pump efficiency 90%) is used for replacing the centrifugal pressurizing technology (pump efficiency 80%), and the energy recovery device shares cylinder equipment, so that the whole energy efficiency is improved and the cost is reduced.
Compared with the current most advanced sea water desalination system of high-pressure sea water pump, pressure exchange energy recovery device and booster pump, the traction push-pull type sea water desalination integrated pressure-superposed device has the characteristics that the cost of the system for pressurizing and recovering energy is reduced by more than 20%, and the equipment price of 1000 tons of water produced in daily life is lower than 100 ten thousand yuan. 2. The electricity consumption of the seawater reverse osmosis unit is reduced by more than 15 percent, and the electricity consumption per ton of water reaches 1.8-2.3kwh, and reaches or exceeds the international advanced level. 3. The system reliability is improved, and the maintenance cost is low. 4. The system has strong adaptability and flexible load adjustment.
Compared with the current domestic hydraulic thrust cylinder (hydraulic cylinder) pressurizing system, the traction push-pull type seawater desalination integrated laminating device overcomes the defects of large transmission moment, high requirement on hydraulic parts and high cost; because the energy is converted by the hydraulic oil, the energy loss is large in transmission, and the hydraulic oil needs to be cooled after a general hydraulic system works for a period of time; the requirement on transmission media is high, particularly in the automatic control, the hole for the control handle in the hydraulic guide valve to finish the hydraulic oil to enter and exit is small, the oil is not clean, impurities are contained, and the hydraulic guide valve is easy to block; the hydraulic part has problems and is difficult to maintain; because of the severe environmental pollution of the hydraulic medium, the oil is generally recovered; if the sealing is not tight, high-pressure oil can infiltrate into raw water.
The traction push-pull type seawater desalination integrated laminating device reduces the occupied area, and the occupied area of reverse osmosis equipment can be effectively reduced by the membrane assemblies which are vertically distributed.
The specific working principle is as follows:
seawater is delivered to the cartridge filter 30 by the low-pressure high-flow water delivery pump 20, filtered seawater enters the upper cavity of the seawater cylinder 6312 in the pressure exchanger 63 through the check valves 6413 and 6414 (assuming that the seawater cylinder piston rod 63121 is in a high position and the seawater cylinder piston rod 63122 is in a low position at the moment), high-pressure strong brine is communicated to the lower cavity of the seawater cylinder 6312 through the valve 61 and the control valve 610, at the moment, the reference diagram of fig. 5 is t 0 Time of day. The traction machine 10 starts to run in an upward stroke, and strong brine is controlled by the two-position four-way valve 610 to enter the lower cavity of the seawater cylinder 6312, and the two parts form a laminating effect on the seawater in the upper cavity. The control system 100 achieves that the seawater cylinder rod 63122 is first uniformly accelerated to a maximum speed, then uniformly moved for a period of time, then uniformly decelerated to zero speed, and the upstroke process is completed. The high-pressure seawater after being overlapped passes through the one-way valve 6413 to the reverse osmosis membrane group 50 to produce fresh water. At the working position t 4 At this point, the control valve 610 is switched to discharge the low pressure strong brine in the lower chamber of the seawater cylinder 6312 through the valve 70.
The high-pressure strong brine is connected to the lower cavity of the seawater cylinder 6311 through the valve 61 and the two-position four-way valve 610, and seawater enters the upper cavity of the seawater cylinder 6311 through the one-way valves 6414 and 6413, as compared with the reference value t 'in fig. 5' 5 Time of day. The machine 10 starts the down stroke operation, and the strong brine is controlled by the control valve 610 to enter the lower chamber of the seawater cylinder 6311, and both of them also form a pressure-superposed effect on the seawater in the upper chamber. The control system 100 achieves that the seawater cylinder rod 63121 is first uniformly accelerated to a maximum speed, then uniformly moved for a period of time, then uniformly decelerated to zero speed, and the upstroke process is completed. The high-pressure seawater after being overlapped passes through the one-way valve 6412 to the reverse osmosis membrane group 50 to produce fresh water. At the working position t 9 At this time, the two-position four-way valve 610 is switched to discharge the low-pressure strong brine in the lower cavity of the seawater cylinder 6311 through the valve 70.
The downstroke of the machine is identical to the upstroke, except that the direction of the speed and acceleration is changed.
Design of relevant size of seawater cylinder
According to the drawing1, reverse osmosis device input pressure P 4 Input flow rate Q 3 High concentration sea water pressure P 7 Recovery rate r=30-65%, P =5.60 MPa 3 =0.5 MPa. The diameter of the pistons (6312-1, 6312-2) is d 1 The diameter of the piston rods (6314-1, 6314-2) is d 2 The diameter of the traction piston rod (6313-1, 6313-2) is d 3 . To simplify the analysis, the reversing valve and pipeline losses were temporarily disregarded, the sea bowl efficiency η=1.
Q Brine ＝Q 3 (1-R) (1-1)
1. Estimating traction power
N Traction machine ＝Q 3 P 4 -Q Brine P 7 ＝Q 3 (P 4 -P 7 +RP 7 ) (1-5)
2. Analysis of traction machine parameters
The permanent magnet synchronous motor is a power source of a novel gearless traction type sea water tank, and whether the operation of the permanent magnet synchronous motor is reliable is the fundamental guarantee of the normal operation of the whole sea water desalination integrated laminating device. Therefore, the determination of the permanent magnet synchronous motor and its related parameters is particularly important.
The gearless traction type laminating device adopts a mode that a permanent magnet synchronous motor is directly connected with a load, so that the motion rule of the permanent magnet synchronous motor is the same as the motion rule of the load, namely, the suspension point load. The suspension point load is one of the important parameters that marks the working capacity of the traction machine. The mastering of the motion law of the suspension points is the basis for researching dynamics of the lamination device, determining basic parameters of the lamination device and designing the integrated lamination device for sea water desalination.
For convenience of research, the motion of the front and rear motors is approximately considered to be a uniform speed change process, the time of the upward and downward strokes of the suspension point is equal to the acceleration and deceleration time, and the uniform motion takes about 3/5 of one stroke. The suspension speed and acceleration curves of one stroke of the gearless traction machine lamination device are shown in fig. 5.
Wherein T is 1 Acceleration or deceleration movement time(s) for up and down strokes; t (T) 2 The uniform motion time(s) is the up and down stroke; Δt is dead zone control time(s); k is the up and down stroke acceleration slope.
Fig. 5 shows that the suspension point of the traction machine moves from the upstroke to the maximum speed by uniformly accelerating, then maintains uniform motion for a period of time, and then moves to the zero speed by uniformly decelerating, thus completing the upstroke process. The downstroke of the suspension point is identical to the upstroke, except that the direction of the velocity and acceleration is changed.
The length of the steel belt spread on the traction wheel is the displacement of the suspension point. In the accelerating section, the rotation angle of the traction sheave is
Wherein omega 0 Rad/s is the initial angular velocity of the traction sheave; t is the time required for the suspension point to move from the dead point to any position, s; epsilon is traction sheave angular acceleration, epsilon=ω/t, rad/s 2 The method comprises the steps of carrying out a first treatment on the surface of the ω is the angular velocity of the traction sheave, rad/s.
The angular speed of the traction sheave and the motor speed have the following relation:
wherein n is the motor speed.
Since the smooth transition time of the suspension point to the highest speed and the suspension point to the lowest speed is shorter, t can be calculated 1 And t 1 '，t 4 And t' 4 ，t 6 And t' 6 ，t 9 And t' 9 And is considered to be the same point. At the same time t 5 And t' 5 Is dead time.
The displacement of the suspension point in different sections is
The velocity of the suspension point is the derivative of the suspension point displacement.
The acceleration of the suspension point is the double differential of the suspension point displacement.
In the transmission mode of the traction type pumping unit, the stroke S is fixed at a certain time, the stroke frequency c and the radius R of the traction wheel are related with each other, and the motor rotation speed n has the following relation:
2πRn＝2Sc (2-6)
the maximum speed and the maximum acceleration of the suspension point are respectively as follows:
determination of motor parameters
The upward movement of the object is taken as the positive direction, and the principle of conservation of energy is known,
wherein M is the rated weight of the suspension point load, H is the stroke of the piston rod of the double-output-rod seawater cylinder, E in The input energy of the system, namely the work input by the motor; e (E) loss Energy lost to the system, E loss ＝0.85E in ；E Concentrated brine Energy is recovered for the brine. The time derivative on both sides can be obtained:
wherein P is in Power required for the system; p (P) Concentrated brine Power provided for brine energy recovery;is the speed of the suspension point; />Is the acceleration of the suspension point.
So that the number of the parts to be processed,
considering overload multiple lambda of motor m The power of the motor is
P＝λ m P in (2-11)
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes or direct or indirect application in the relevant art utilizing the present specification and drawings are included in the scope of the present invention.
Claims (4)
1. The utility model provides a membrane method sea water desalination tows push-pull formula integration and stacks pressure equipment, includes water pump (20), pressure transducer (63), reverse osmosis membrane group (50), its characterized in that: the hydraulic traction machine is characterized by further comprising a seawater supply part (64) and a gearless traction machine (10), wherein the water supply pump (20), the seawater supply part (64) and the pressure transducer (63) are sequentially connected, the pressure transducer (63) comprises a first seawater cylinder (6311) and a second seawater cylinder (6312), a first piston rod (63141) and a first traction piston rod (63131) are respectively arranged on two sides of a first seawater piston (63121) of the first seawater cylinder (6311), a second piston rod (63142) and a second traction piston rod (63132) are respectively arranged on two sides of a second seawater piston (63122) of the second seawater cylinder (6312), and the first traction piston rod (63131) and the second traction piston rod (63132) are in traction lifting through the gearless traction machine; the seawater cylinder at one side of the first traction piston rod (63131) of the first seawater cylinder (6311) is respectively communicated with the reverse osmosis membrane group (50) and the filter (30) through a seawater supply part (64); the seawater cylinder at one side of a first piston rod (63141) of the first seawater cylinder (6311) is respectively communicated with one side of a two-position four-way reversing valve (610), and the other side of the two-position four-way reversing valve is respectively communicated with a low-pressure strong brine water outlet and high-pressure strong brine; the seawater cylinder at one side of the second traction piston rod (63132) of the second seawater cylinder (6312) is respectively communicated with the reverse osmosis membrane group (50) and the filter (30) through a seawater supply part (64); the seawater cylinder at one side of a second piston rod (63142) of the second seawater cylinder (6312) is respectively communicated with one side of a two-position four-way reversing valve (610), and the other side of the two-position four-way reversing valve (610) is respectively communicated with a low-pressure strong brine water outlet and high-pressure strong brine water outlet; the automatic traction device is characterized in that a first seawater piston (63121), a second seawater piston (63122), a water supply pump (20), a gearless traction machine (10) and two-position four-way reversing valves (610) are all controlled by a control system (100), a first fixed pulley (101) and a second fixed pulley (102) are respectively arranged above two sides of the gearless traction machine (10), the gearless traction machine (10) drives the first seawater piston (63121) and the second seawater piston (63122) to traction and lift respectively through the first fixed pulley (101) and the second fixed pulley (102), a first movable pulley (103) and a second movable pulley (104) are respectively arranged below two sides of the gearless traction machine (10), and the gearless traction machine (10) drives the first seawater piston (63121) and the second seawater piston (63122) to traction and lift respectively through the first movable pulley (103) and the second movable pulley (104); the seawater supply part (64) is provided with a first energy accumulator (40) on a pipeline communicated with the reverse osmosis membrane group (50), a two-position four-way reversing valve (610) is provided with a second energy accumulator (60) and a first valve (61) on a pipeline communicated with the reverse osmosis membrane group (50), and a second valve (70) is arranged on a pipeline connected with a water outlet of the two-position four-way reversing valve (610).
2. The membrane method sea water desalination traction push-pull integrated lamination device according to claim 1, which is characterized in that: the first seawater piston (63121) and the second seawater piston (63122) are respectively provided with a first control switch (651) and a third control switch (653); the traction end of the gearless traction machine (10) is respectively provided with a second control switch (652) and a fourth control switch (654).
3. The membrane method sea water desalination traction push-pull integrated lamination device according to claim 1, which is characterized in that: a filter (30) is arranged on a pipeline connected with the seawater supply part (64) of the water supply pump (20).
4. The membrane method sea water desalination traction push-pull integrated lamination device according to claim 1, which is characterized in that: the first seawater piston cylinder (63111), the second seawater piston cylinder (63112), the first traction piston rod (63131), the second traction piston rod (63132), the first piston rod (63141) and the second piston rod (63142) are made of seawater corrosion resistant materials; the surfaces of the first traction piston rod (63131), the second traction piston rod (63132), the first piston rod (63141) and the second piston rod (63142) and the inner bores of the first seawater piston cylinder (63111) and the second seawater piston cylinder (63112) are coated with oxide ceramic coatings by APS plasma spraying.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU5717280A (en) * | 1979-04-06 | 1980-10-09 | Keeper, B.G. | Pump driven osmotic separator |
| CN101041484A (en) * | 2006-03-22 | 2007-09-26 | 天津市蓬拓科技有限公司 | Hyperfiltration sea-water distillatory with energy recovery |
| CN202808438U (en) * | 2012-07-31 | 2013-03-20 | 朱荣辉 | Membrane-method seawater desalination pressurization and energy recovery integrated device |
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2018
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU5717280A (en) * | 1979-04-06 | 1980-10-09 | Keeper, B.G. | Pump driven osmotic separator |
| CN101041484A (en) * | 2006-03-22 | 2007-09-26 | 天津市蓬拓科技有限公司 | Hyperfiltration sea-water distillatory with energy recovery |
| CN202808438U (en) * | 2012-07-31 | 2013-03-20 | 朱荣辉 | Membrane-method seawater desalination pressurization and energy recovery integrated device |
| EP2881370A1 (en) * | 2012-07-31 | 2015-06-10 | Ronghui Zhu | Membrane seawater desalination pressurization and energy recovery integrated method and device |
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