CN210710973U - Traction push-pull type integrated laminating device for seawater desalination by membrane method - Google Patents
Traction push-pull type integrated laminating device for seawater desalination by membrane method Download PDFInfo
- Publication number
- CN210710973U CN210710973U CN201821772868.3U CN201821772868U CN210710973U CN 210710973 U CN210710973 U CN 210710973U CN 201821772868 U CN201821772868 U CN 201821772868U CN 210710973 U CN210710973 U CN 210710973U
- Authority
- CN
- China
- Prior art keywords
- seawater
- traction
- piston rod
- piston
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000013535 sea water Substances 0.000 title claims abstract description 210
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 46
- 239000012528 membrane Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010030 laminating Methods 0.000 title claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 27
- 230000010354 integration Effects 0.000 claims abstract description 6
- 239000012267 brine Substances 0.000 claims description 23
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 21
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 3
- 239000011224 oxide ceramic Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 239000000725 suspension Substances 0.000 description 25
- 230000033001 locomotion Effects 0.000 description 19
- 238000011084 recovery Methods 0.000 description 15
- 230000001133 acceleration Effects 0.000 description 13
- 238000009826 distribution Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 239000013505 freshwater Substances 0.000 description 7
- 239000010720 hydraulic oil Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000007750 plasma spraying Methods 0.000 description 4
- 239000003566 sealing material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 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
- 239000012466 permeate Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model relates to a sea water desalination technical field especially relates to a membrane method sea water desalination tows push-pull type integration and folds pressure equipment. Including water feeding pump, pressure transducer, reverse osmosis membrane group, still be provided with sea water supply portion and gearless hauler, water feeding 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 piston rod of towing respectively, the second sea water piston both sides of second sea water jar are provided with piston rod and second respectively and tow the piston rod, first piston rod of towing and second tow the piston rod and tow the lift through gearless hauler. The system reliability is improved, and the maintenance cost is low. The system has strong adaptability and flexible load adjustment.
Description
Technical Field
The utility model relates to a sea water desalination technical field especially relates to a membrane method sea water desalination tows push-pull type integration and folds pressure equipment.
Background
Two common methods for seawater desalination are thermal method and membrane method. Among them, the membrane method seawater desalination technology using reverse osmosis membrane is widely used due to its low cost and low energy consumption, and is becoming mainstream gradually.
In a seawater desalination system, pretreated seawater with low salt content entering the desalination system is used as raw seawater, high-pressure raw seawater is formed after pressurization, one part of the raw seawater passes through a reverse osmosis membrane group to become low-pressure fresh water, the rest of the raw seawater becomes high-pressure strong brine, and the high-pressure strong brine is discharged after energy recovery and pressure energy release.
The technology comprises three core components: a reverse osmosis membrane, a high-pressure pump and an energy recovery device. The high-pressure pump raises the pressure of the original seawater to 5-7 MPa, so that about 40% of fresh water permeates through the reverse osmosis membrane, and the rest about 60% of the concentrated brine still has pressure potential energy of about 4-6 MPa and needs to be transmitted into the original seawater through the 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 cost of the two is about 1/3 of the total investment cost, the power consumption is more than 2/3 of the total power consumption, the power consumption cost is more than 1/3 of the operation cost, the power consumption per ton of fresh water produced by the method is 3.5kWh at present, the limit power consumption is about 2.5kWh under the existing membrane technology level, and 1/3 of energy-saving space is left.
At present, the high-pressure pump used in the reverse osmosis seawater desalination project in China mainly comprises an imported multistage centrifugal pump and a reciprocating pump.
The multistage centrifugal pump drives fluid to rotate through impeller blades rotating at a high speed, the fluid is thrown out under the action of centrifugal force, and the multistage centrifugal pump can convey liquid with higher pressure through a multistage structure. The current multistage centrifugal pump for seawater desalination is mainly divided into three levels: the flow rate of the multistage centrifugal pump is more than 220m3On the occasion of/h, the highest efficiency can reach 75-85%, and the pointer is generally large; the flow range of the sectional type multistage centrifugal pump is 80-220 m3H, efficiency at 6580 percent of the total volume is smaller; the normal flow of the stainless steel stamping pump is not more than 95m3H, but the efficiency is generally less than 70%.
The output flow of the multistage centrifugal pump is large and stable, but the working efficiency is low compared with a positive displacement pump, and the working efficiency is reduced along with the increase of the pressure. At present, manufacturers of seawater desalination multistage centrifugal high-pressure pumps include KSB company in Germany, Sulzer company in Switzerland, Danish 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 small and medium-sized seawater desalination systems from the viewpoint of reducing energy consumption.
Reciprocating pumps belong to the positive displacement type, and the reciprocating motion of a piston in a body causes the inner working volume to be periodically increased and reduced, and high-pressure liquid is conveyed through the corresponding closing and opening actions of a one-way valve. The rated flow of the reciprocating pump is generally not more than 120m3The efficiency is generally more than 85% because of the positive displacement pump, but the output flow rate has a pulsating characteristic due to the influence of the inherent structure. At present, manufacturers of the seawater desalination reciprocating high-pressure pump mainly comprise American CAT company, American MYERS company and the like. The reciprocating pump has the advantages of complex structure, large volume and high working efficiency, can keep stable efficiency under different pressure levels, and is suitable for being used in small and medium-sized seawater desalination systems.
In recent years, along with the development of water hydraulic technology, danish Danfoss company, which has been engaged in the manufacture of water hydraulic components for a long time, has developed a series of high-pressure axial plunger pumps for seawater desalination. The series of pumps are axial plunger structures with end face flow distribution, have good self-absorption capacity, can work at high rotating speed, and can enable pumps with small volumes to output large flow. The key friction pair of the series of pumps is lubricated by seawater directly, so that the maintainability is good, and the pollution caused by grease leakage is avoided.
The end face flow distribution seawater desalination high-pressure axial plunger pump is influenced by periodic flow distribution in the working process, the pressure in a plunger cavity and the suction and discharge flow rate dynamically change along with the rotation of a cylinder body, and the sharp change of the pressure in the plunger cavity is a main source of the generation of pump vibration and noise. The high-speed rotation of fluid and the reciprocating motion of plunger make the flow area of water constantly change in the pump during sea water desalination high pressure axial plunger pump work, and the low viscosity of sea water (the viscosity of sea water is only 1/50 ~ 1/40 about the hydraulic oil) makes most flow area be the turbulent flow state of full development, therefore the sea water is complicated unsteady turbulent flow cavitation flow in the pump.
Therefore, the design theory and method of the axial plunger pump using hydraulic oil as the medium cannot be completely applied to the seawater hydraulic axial plunger pump, and research and discussion based on these characteristics of the seawater medium are required. The practical application 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 seawater axial plunger pump manufactured by the domestic brand is about one year. If the APP pump requires pre-filtration, pressure and speed conditions specified by the manufacturer, the pump can be operated for at least 8000 hours.
At present, two high-pressure pumps for seawater desalination are provided, one is a piston type, and a crank-connecting rod mechanism is adopted to convert the power of the rotation of a motor into the linear motion of a piston in a cylindrical cylinder body so as to pressurize seawater; the structure has high 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, the structure is limited by the length of the crank connecting rod, the reversing frequency is high, the vibration and the noise are large, and the failure rate of the control valve and the sealing element is high. The other is a centrifugal water pump, the water pressure is raised by the centrifugal force generated by the rotation of a multi-stage rotor, the flow is large and stable, valve control is not needed, but the efficiency is low, and the pump efficiency is usually lower than 80 percent and averagely about 75 percent. Due to the characteristics of strong corrosivity and low viscosity of seawater, high-quality corrosion-resistant and wear-resistant materials such as copper alloy, dual-phase steel and even ceramic materials are required for the support and flow passage components of the two pumps, and the manufacturing cost is very high.
At present, two energy recovery devices for seawater desalination are provided, one is based on the principle of a hydraulic turbine, high-pressure strong brine pushes the turbine to rotate, and then the original seawater is pressurized without flow distribution control or booster pump, and the flow is stable and continuous; however, the recovery efficiency is low, generally only up to 60%, and the concentrated seawater pressure potential energy-shaft rotation mechanical energy-primary seawater pressure potential energy needs to be converted twice, and is gradually eliminated. The other is based on the pressure exchange principle, namely in the cylindrical cylinder body, the high-pressure strong brine directly transmits pressure potential energy to the original seawater through the flow distribution mechanism, the transmission efficiency is very high, and the energy recovery efficiency can reach more than 90 percent; according to different flow distribution modes, the flow distribution structure can be divided into a rotary cylinder end face flow distribution piston-free structure and a fixed cylinder valve flow distribution structure with a piston; the end face flow distribution piston-free structure of the rotary cylinder (such as PX series products of a certain company in the United states) is simple in structure, but 25% of mixture exists, an independent booster pump is needed, and the overall efficiency is reduced; the valve flow distribution structure with the fixed cylinder body provided with the piston does not need to be provided with a booster pump, the efficiency can be higher, but the control mechanism is more complex. The related patents at home and abroad are based on the technical solutions.
Therefore, the inventor provides a traction push-pull type integrated laminating device by means of related design and manufacturing experience for many years so as to overcome the defects of the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of prior art, adapt to reality needs, provide a membrane method sea water desalination tows push-pull integration and folds and press the device.
In order to realize the utility model discloses a purpose, the utility model discloses a technical scheme do: the utility model provides a membrane method sea water desalination tows push-pull type integration and folds pressure equipment, includes water feeding pump, pressure transducer, reverse osmosis membrane group, still is provided with sea water supply portion and gearless hauler, water feeding 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 tow the piston rod respectively, the second sea water piston both sides of second sea water jar are provided with piston rod and second respectively and tow the piston rod, first tow piston rod and second tow the piston rod and tow the lift through gearless hauler. 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 filter through a seawater supply part; the seawater cylinder on 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 the first valve 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 filter through a seawater supply part; the seawater cylinder on 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 the first valve 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 all controlled by a control system. The gearless tractor system compares to a geared system: the volume of the tractor can be reduced by 60 percent, and the transmission efficiency of the whole equipment is improved by 30 percent. Compared with a hydraulic power system: hydraulic motors, hydraulic oil tanks, coolers, filters, pressure-adjustable electric control overflow valves, liquid level sensors or liquid level indicating meters, connecting pipelines, valves and the like are reduced, the volume of the system can be 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; different from a conventional oil cylinder, the composite seawater cylinder has the advantages that the required corrosion resistance grade is very high, all parts are made of duplex stainless steel, and no welding structure exists. In order to meet the requirement of high-frequency (24-hour) continuous operation of the seawater cylinder, APS (plasma spraying) oxide ceramic coatings are adopted on the surface of the piston rod and the inner hole of the cylinder barrel, so that the wear-resisting and corrosion-resisting capabilities 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 suitable for 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 (food grade), so that the water quality is ensured to be pollution-free and the drinking grade requirement is met.
The control system is provided with an industrial Ethernet interface (an expandable industrial Ethernet module), on one hand, the control system is communicated with a central control room, and the SCADA monitoring function of seawater desalination is realized; 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 low-pressure raw water, high-pressure raw water, strong brine, fresh water pressure and flow. The control unit and the traction frequency converter (shown in figure 2) form master-slave communication through a field bus, and 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 fourth control switch also participate in a 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 a first seawater piston and a second seawater piston to drag and lift through the first fixed pulley and the second fixed pulley.
And a first movable pulley and a second movable pulley are respectively arranged below two sides of the gearless traction machine, and the gearless traction machine drives a first seawater piston and a second seawater piston to drag and lift through the first movable pulley and the second movable pulley respectively.
The two-position four-way regulating valve solves the problem of poor synchronism during combined operation of a plurality of valves. The driving device can be made into a plunger control valve or a rotary control valve by adopting motor control. The plunger control valve can operate at a faster switching speed without causing large hydraulic shock to the desalination system. The valve mainly comprises two coaxial pistons and a cylindrical barrel, wherein the pistons linearly reciprocate in the barrel under the drive of a permanent magnet synchronous linear motor. The reliability of the device is improved, and the system maintenance requirement is greatly reduced. When the rotary control valve is at a specific working position, the corresponding hydraulic cylinder is communicated with high-pressure salt water, the high-pressure salt water transmits static pressure to the original seawater, the hydraulic cylinder carries out a pressurization process, and meanwhile, in the other hydraulic cylinder, the pressure relief salt water is discharged from the pressure relief salt water opening of the rotary valve under the pushing of the original seawater. The control system can detect the position and the speed of the piston through a rotary encoder in the traction system, and drives a four-way regulating valve 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 the pressurized seawater supply is ensured.
And a filter is arranged on a pipeline connecting the water feeding pump and the seawater supply part.
The pipeline that sea water supply department and reverse osmosis membrane group communicate is provided with first energy storage ware on, is provided with second energy storage ware and first valve on the pipeline that two four-way reversing valve 610 and reverse osmosis membrane group communicate, is provided with the second valve on the pipeline that two four-way reversing valve and outlet connection.
The beneficial effects of the utility model reside in that:
1. the cost of the pressurization and energy recovery system is reduced by more than 20 percent, and the equipment price of 1000 tons of water produced per day is lower than 100 ten thousand yuan;
2. the power consumption of the seawater reverse osmosis unit is reduced by more than 15 percent, reaches 1.8-2.3kwh per ton of water power consumption, 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 present invention will be further described with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic structural view of a membrane-type seawater desalination traction push-pull type integrated laminating device of the present invention;
FIG. 2 is a schematic diagram of a control circuit of a traction motor in the membrane type seawater desalination traction push-pull type integrated laminating device;
FIG. 3 is a schematic view of the placement mode of the traction machine in the film-type seawater desalination traction push-pull integrated laminating device of the present invention;
FIG. 4 is a schematic view of the placement mode of the traction machine in the membrane-type seawater desalination traction push-pull integrated laminating device of the present invention;
FIG. 5 is a graph of the suspension point velocity and acceleration.
Detailed Description
The invention will be further described with reference to the following figures and examples:
see fig. 1-5.
The utility model discloses a membrane method sea water desalination tows push-pull type integration and folds pressure equipment, including water feeding pump 20, pressure transducer 63, reverse osmosis membrane group 50, its characterized in that: the hydraulic power transmission system is further provided with a seawater supply part 64 and a gearless traction machine 10, the water delivery pump 20, the seawater supply part 64 and the pressure converter 63 are sequentially connected, the pressure converter 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 63122 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 63122 are lifted by the gearless traction machine 10 in a traction manner. The seawater vat on the first traction piston rod 63131 side of the first seawater vat 6311 is respectively communicated with the reverse osmosis membrane module 50 and the filter 30 through the seawater supply part 64; the seawater cylinder on 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 first valve 61 and the high-pressure strong brine; the seawater tank at the second traction piston rod 63122 side of the second seawater tank 6312 is respectively communicated with the reverse osmosis membrane group 50 and the filter 30 through the seawater supply part 64; the seawater vat on one side of the second piston rod 63142 of the second seawater vat 6312 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 first valve 61 and the high-pressure concentrated brine; 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 traction machine 10 compares with a geared system: the volume of the tractor can be reduced by 60 percent, and the transmission efficiency of the whole equipment is improved by 30 percent. Compared with a hydraulic power system: hydraulic motors, hydraulic oil tanks, coolers, filters, pressure-adjustable electric control overflow valves, liquid level sensors or liquid level indicating meters, connecting pipelines, valves and the like are reduced, the volume of the system can be 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 63111 and the second seawater piston cylinder 63112 are made of seawater corrosion resistant materials; different from a conventional oil cylinder, the composite seawater cylinder has the advantages that the required corrosion resistance grade is very high, all parts are made of duplex stainless steel, and no welding structure exists. In order to meet the requirement of high-frequency (24-hour) continuous operation of the seawater cylinder, APS (plasma spraying) oxide ceramic coatings are adopted on the surface of the piston rod and the inner hole of the cylinder barrel, so that the wear-resisting and corrosion-resisting capabilities 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 suitable for 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 (food grade), so that the water quality is ensured to be pollution-free and the drinking grade requirement is met.
The control system 100 is provided with an industrial Ethernet interface (an expandable industrial Ethernet module), on one hand, the control system communicates with a central control room, and the SCADA monitoring function of seawater desalination is realized; 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 low-pressure raw water, high-pressure raw water, strong brine, fresh water pressure and flow. The control unit and the traction frequency converter (shown in figure 2) form master-slave communication through a field bus, and 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 fourth control switch 654 also participate in the safety protection system of the hoisting system.
A first fixed pulley 101 and a second fixed pulley 102 are respectively arranged above two sides of the gearless traction machine 10, and the gearless traction machine 10 drives a first seawater piston 63121 and a second seawater piston 63122 to lift and lower 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 a first seawater piston 63121 and a second seawater piston 63122 to lift and lower through the first movable pulley 103 and the second movable pulley 104.
The two-position four-way regulating valve 610 eliminates the problem of poor synchronization when multiple valves are operated in combination. The driving device can be made into a plunger control valve or a rotary control valve by adopting motor control. The plunger control valve can operate at a faster switching speed without causing large hydraulic shock to the desalination system. The valve mainly comprises two coaxial pistons and a cylindrical barrel, wherein the pistons linearly reciprocate in the barrel under the drive of a permanent magnet synchronous linear motor. The reliability of the device is improved, and the system maintenance requirement is greatly reduced. When the rotary control valve is at a specific working position, the corresponding hydraulic cylinder is communicated with high-pressure salt water, the high-pressure salt water transmits static pressure to the original seawater, the hydraulic cylinder carries out a pressurization process, and meanwhile, in the other hydraulic cylinder, the pressure relief salt water is discharged from the pressure relief salt water opening of the rotary valve under the pushing of the original seawater. The control system 100 can detect the position and the speed of the piston through a rotary encoder in the traction system, and the control system 100 drives the motor according to the in-place signal of the piston to realize the conversion of the working position of the rotary valve, so that the hydraulic cylinder alternately realizes the pressure increasing and releasing processes, and the continuity of the pressurized seawater supply is ensured.
The filter 30 is provided in a pipe connecting the water pump 20 and the seawater supply part 64.
The pipeline of the seawater supply part 64 communicated with the reverse osmosis membrane group 50 is provided with a first energy accumulator 40, the pipeline of the two-position four-way reversing valve 610 communicated with the reverse osmosis membrane group 50 is provided with a second energy accumulator 60 and a first valve 61, and the pipeline of the two-position four-way reversing valve 610 connected with the water outlet is provided with a second valve 70.
The invention can simultaneously complete three functions of a high-pressure seawater pump, a booster pump and an energy recovery device through a pair of seawater piston cylinders, adopts traction drive to supplement energy required by seawater desalination, and realizes the recovery of pressure energy by liquid-liquid exchange.
The key innovation point of the scheme is that a centrifugal pressurizing technology (pump efficiency is 80%) is replaced by a hydraulic pressurizing technology (pump efficiency is 90%), and a cylinder device is shared by the hydraulic pressurizing technology and the energy recovery device, so that the overall energy efficiency is improved, and the cost is reduced.
Compared with the most advanced seawater desalination system comprising a high-pressure seawater pump, a pressure exchange energy recovery device and a booster pump at present abroad, the traction push-pull type seawater desalination integrated laminating device has the characteristics that 1, the cost of the pressurization and energy recovery system is reduced by more than 20%, and the equipment price of 1000 tons of daily produced water is lower than 100 ten thousand yuan. 2. The power consumption of the seawater reverse osmosis unit is reduced by more than 15 percent, reaches 1.8-2.3kwh per ton of water power consumption, 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 traditional domestic hydraulic thrust cylinder (hydraulic cylinder) pressurizing system, the traction push-pull type seawater desalination integrated laminating device overcomes the defects of large transmission torque, high requirement on hydraulic parts and high cost; because energy conversion is carried out through hydraulic oil, energy loss in transmission is large, and after a general hydraulic system works for a period of time, the hydraulic oil needs to be cooled when being heated; the requirement on transmission media is high, and particularly in the automatic control, holes for completing the inlet and outlet of hydraulic oil by a control handle in the hydraulic guide valve are very small, the oil is not clean, impurities exist, and the blockage is easy to occur; the problem of the hydraulic part is solved, and the maintenance difficulty is high; because of hydraulic medium, the environmental pollution is serious, and oil is generally recycled; if the seal is not tight, the high-pressure oil can permeate into the raw water.
The traction push-pull type seawater desalination integrated laminating device reduces the floor area, and the membrane module arranged vertically can effectively reduce the floor area of reverse osmosis equipment.
The specific working principle is as follows:
the seawater is delivered to the filter 30 by the low-pressure high-flow water pump 20, the 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 first seawater cylinder piston rod 63121 is at a high position and the second seawater cylinder piston rod 63122 is at a low position at this time), the high-pressure brine is communicated to the lower cavity of the seawater cylinder 6312 through the first valve 61 and the control valve 610, and at this time, the moment is shown in fig. 5. The gearless traction machine 10 starts to run in an up stroke, the strong brine is controlled by the two-position four-way valve 610 to start to enter the lower cavity of the second seawater cylinder 6312, and the two valves form a pressure-superposed effect on the seawater in the upper cavity. The control system 100 realizes that the second seawater cylinder piston rod 63122 performs uniform acceleration movement to the maximum speed firstly, then maintains uniform movement for a period of time, performs uniform deceleration movement to zero speed, and completes the upstroke process. Laminating pressThe high pressure seawater passes through the check valve 6413 to the reverse osmosis membrane module 50 to produce fresh water. At work to t4At that moment, the control valve 610 switches to discharge the low-pressure concentrated brine in the lower cavity of the second seawater cylinder 6312 through the second valve 70.
The high-pressure strong brine is connected to the lower cavity of the first sea water cylinder 6311 through the first valve 61 and the two-position four-way valve 610, and the sea water enters the upper cavity of the first sea water cylinder 6311 through the check valves 6414, 6413, where t is the reference in fig. 55Time of day. The gearless machine 10 starts the downstroke and the brine is controlled by the control valve 610 to enter the lower cavity of the first seawater cylinder 6311, both of which also form a pressure-superposed effect on the seawater in the upper cavity. The control system 100 realizes that the first seawater cylinder piston rod 63121 performs uniform acceleration movement to the maximum speed firstly, then maintains uniform movement for a period of time, and performs uniform deceleration movement to zero speed to complete the upstroke process. The high-pressure seawater after pressure superposition passes through the one-way valve 6412 to the reverse osmosis membrane group 50 to produce fresh water. At work to t9At that time, the two-position four-way valve 610 switches to discharge the low-pressure brine in the lower cavity of the first seawater cylinder 6311 through the second valve 70.
The down stroke of the tractor is the same as the up stroke, but the direction of the speed and acceleration is changed.
Design of relevant size of seawater cylinder
According to FIG. 1, the reverse osmosis unit has an input pressure P4Input flow rate Q3High concentration seawater pressure P75.60MPa, recovery rate R is 30% -65%, P30.5 MPa. The diameter of the piston (6312-1, 6312-2) is d1The diameter of the piston rod (6314-1, 6314-2) is d2The diameter of the traction piston rod (6313-1, 6313-2) is d3To simplify the analysis, the diverter valve and line losses were temporarily ignored and the seawater cylinder efficiency η was equal to 1.
QSalt water＝Q3(1-R) (1-1)
1. Estimating the traction power
NTraction machine＝Q3P4-QSalt waterP7＝Q3(P4-P7+RP7) (1-5)
2. Analysis of tractor parameters
The permanent magnet synchronous motor is a power source of a novel gearless traction type seawater cylinder, and whether the operation of the permanent magnet synchronous motor is reliable or not is the fundamental guarantee of the normal operation of the whole seawater desalination integrated laminating device. Therefore, the determination of the permanent magnet synchronous motor and the related parameters thereof is important.
The gearless traction type laminating device adopts a mode that the permanent magnet synchronous motor is directly connected with the load, so that the motion rule of the permanent magnet synchronous motor is the same as that of the load, namely the suspension point load. The load of the suspension point is one of the important parameters that mark the working capacity of the hoisting machine. Mastering the motion rule of the suspension point is the basis for researching the dynamics of the laminating device, determining the basic parameters of the laminating device and designing the integrated laminating device for seawater desalination.
For research convenience, the motion of the motor before and after the suspension point is reversed is approximately considered to be a uniform speed changing process, the time of the suspension point upper stroke and the time of the suspension point lower stroke are equal to the time of the suspension point upper stroke and the time of the suspension point lower stroke, and the uniform speed motion occupies 3/5 time of one stroke. The suspension point speed and acceleration curve of one stroke of the laminating device of the gearless traction machine is shown in figure 5.
Wherein, T1Acceleration or deceleration movement time(s) for up and down strokes; t is2The uniform motion time(s) of the up stroke and the down stroke; Δ t is a dead time control time(s); k is the up and down stroke acceleration slope.
Fig. 5 shows that the suspension point of the tractor performs uniform acceleration movement to the maximum speed from the upward stroke, then keeps uniform movement for a period of time, and performs uniform deceleration movement to zero speed to complete the upward stroke process. The down stroke of the suspension point is the same as the up stroke, but the direction of the velocity and acceleration is changed.
The length of the steel strip spread on the traction sheave is the displacement of the suspension point. In the acceleration section, the angle of rotation of the traction sheave is
Wherein, ω is0Is the initial angular velocity of the traction sheave, rad/s; t is the time required for the suspension point to move from the dead point to any position, s; epsilon is the angular acceleration of the traction wheel, and epsilon is omega/t rad/s2(ii) a Omega is the angular velocity of the traction sheave, rad/s. The angular speed of the traction wheel and the rotating speed of the motor have the following relations:
wherein n is the motor speed.
T can be set by the shorter smooth transition time between the suspension point to the highest speed and the suspension point to the lowest speed1And t'1，t4And t'4，t6And t'6，t9And t'9Seen as the same point. At the same time, t5And t'5Is the dead time.
The displacement of the suspension point in the different sections is
The velocity of the suspension point is the differential of the displacement of the suspension point.
The acceleration of the suspension point is the double differential of the displacement of the suspension point.
In the transmission mode of the traction type oil pumping machine, the stroke is fixed, the stroke frequency c and the radius R of a traction wheel are determined, and the motor
The rotating 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 motion of the object is taken as the positive direction, which can be known from the law of energy conservation,
wherein M is the rated weight of the suspension point load, H is the stroke of the piston rod of the double-extension-rod seawater cylinder, and is the input energy of the system, namely the work input by the motor; 0.85 is the energy lost by the system; eStrong brineEnergy is recovered for the strong brine. The two-sided time derivation can be found:
wherein, PinThe power required for the system; pStrong brineThe power provided for the energy recovery of the strong brine;
the velocity of the suspension point;
the acceleration of the suspension point.
Therefore, the first and second electrodes are formed on the substrate,
taking into account the overload factor lambda of the electric machinemThe power of the motor is
P＝λmPin(2-11)
The above mentioned is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings or the direct or indirect application in the related technical field are included in the patent protection scope of the present invention.
Claims (7)
1. The utility model provides a membrane method sea water desalination tows push-pull integration and folds pressure equipment, includes delivery pump (20), pressure transducer (63), reverse osmosis membrane group (50), its characterized in that: the seawater and seawater combined lifting device is further provided with a seawater supply part (64) and a gearless traction machine (10), the water feeding pump (20), the seawater supply part (64) and the pressure converter (63) are sequentially connected, the pressure converter (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 lifted through the gearless traction machine (10); the seawater cylinder on 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 on 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 (610) is respectively communicated with a first valve (61) and high-pressure concentrated brine; the seawater cylinder on 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 on 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 first valve (61) and high-pressure concentrated brine; the first seawater piston (63121), the second seawater piston (63122), the water delivery pump (20), the gearless traction machine (10) and the two-position four-way reversing valve (610) are all controlled by a control system (100).
2. The membrane-process seawater desalination traction push-pull integrated laminating device according to claim 1, characterized in that: a first fixed pulley (101) and a second fixed pulley (102) are respectively arranged above two sides of the gearless traction machine (10), and the gearless traction machine (10) drives a first seawater piston (63121) and a second seawater piston (63122) to drag and lift through the first fixed pulley (101) and the second fixed pulley (102).
3. The membrane-process seawater desalination traction push-pull integrated laminating device according to claim 1, characterized in that: 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 a first seawater piston (63121) and a second seawater piston (63122) to drag and lift through the first movable pulley (103) and the second movable pulley (104).
4. The membrane-process seawater desalination traction push-pull integrated laminating device according to claim 1, 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).
5. The membrane-process seawater desalination traction push-pull integrated laminating device according to claim 1, characterized in that: and a filter (30) is arranged on a pipeline connecting the water feeding pump (20) and the seawater supply part (64).
6. The membrane-process seawater desalination traction push-pull integrated laminating device according to claim 1, characterized in that: 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 second energy accumulator (60) and a first valve (61) are arranged on a pipeline communicated with the reverse osmosis membrane group (50) through the two-position four-way reversing valve (610), and a second valve (70) is arranged on a pipeline connected with the water outlet through the two-position four-way reversing valve (610).
7. The membrane-process seawater desalination traction push-pull integrated laminating device according to claim 1, 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 materials resistant to seawater corrosion; the surfaces of the first traction piston rod (63131), the second traction piston rod (63132), the first piston rod (63141), the second piston rod (63142), the inner bores of the first seawater piston cylinder (63111) and the second seawater piston cylinder (63112) are coated with APS oxide ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821772868.3U CN210710973U (en) | 2018-10-30 | 2018-10-30 | Traction push-pull type integrated laminating device for seawater desalination by membrane method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821772868.3U CN210710973U (en) | 2018-10-30 | 2018-10-30 | Traction push-pull type integrated laminating device for seawater desalination by membrane method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210710973U true CN210710973U (en) | 2020-06-09 |
Family
ID=70965940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821772868.3U Expired - Fee Related CN210710973U (en) | 2018-10-30 | 2018-10-30 | Traction push-pull type integrated laminating device for seawater desalination by membrane method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210710973U (en) |
-
2018
- 2018-10-30 CN CN201821772868.3U patent/CN210710973U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11454351B2 (en) | Multiphase flow mixed delivery method employing reciprocating driving performed by liquid in two chambers and device thereof | |
| CN100567730C (en) | Hydraulic drive fluid pump | |
| CN101782095B (en) | Differential energy recovery device and method for seawater desalination system | |
| CN103112927B (en) | Transmitting system powered by compressed air and seawater desalination method and system | |
| CN101985951B (en) | Electric-hydraulic reversing energy recovery device | |
| CN104019065A (en) | Pressure exchange method of pressure exchange pump | |
| CN210710973U (en) | Traction push-pull type integrated laminating device for seawater desalination by membrane method | |
| CN110723782A (en) | Sea water desalting device | |
| CN103230745A (en) | Differential pressure booster-type energy recovery device based on reverse osmosis system | |
| CN109250833B (en) | Membrane method sea water desalination traction push-pull type integrated laminating device | |
| CN112759009A (en) | Pressure oil direct-drive seawater desalination system based on wave energy conversion | |
| CN201606355U (en) | Differential energy recovering device used for seawater desalting system | |
| CN201882933U (en) | Device for transmitting wind energy to desalt seawater for hydraulic system | |
| CN101865102B (en) | Automatic hydraulic augmented injection pump | |
| CN208858668U (en) | A kind of energy-efficient four cylinder of flexible pipe membrane pump back and forth drives pump control hydraulic system | |
| CN201836155U (en) | Electro-hydraulic liquid reversing energy recovery unit | |
| CN201065842Y (en) | Electric submersible pump set for extremely small displacement well | |
| CN204493310U (en) | Portable hydraulic automatic reciprocating mechanism | |
| CN203742927U (en) | Hydraulic-pushing reciprocating duplex pump | |
| CN102562723B (en) | Automatic differential pressure pump | |
| CN105148733A (en) | Piston swinging coupling type frequency variable pulse energy converter | |
| CN202001173U (en) | Double-layer double-volute energy transmission actuator | |
| CN220622088U (en) | Plunger pump cooperation pressurizing device | |
| CN212369934U (en) | Traction type combined plunger valve used in seawater desalination energy recovery device | |
| CN220435134U (en) | Hydraulic system of thickener |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200609 |