CN107337289A - A kind of reverse osmosis desalination device for integrating wind energy luminous energy and seawater accumulation of energy - Google Patents

Abstract

The invention relates to a reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage, and belongs to the fields of wind-solar hybrid power generation technology, seawater pumped storage technology, seawater desalination technology, intelligent control technology and the like. The photovoltaic array includes several photovoltaic power generation panels distributed at equal intervals. The wind generator and photovoltaic array are fixed on the ground, and the wind generator and photovoltaic array are respectively electrically connected to the inverter; The pool is set at a place higher than the low-level reservoir, and the high-level reservoir is opened with a channel connected to the low-level reservoir. Valves are installed on the channel, and the reversible pump-turbine unit is installed on the channel; the inverter, reversible pump-turbine unit, The load and the storage battery are respectively electrically connected to the controller, and the load is electrically connected to the storage battery. The invention combines pumped storage with wind-solar hybrid power generation system, and the rapid change characteristics can make up for the instability of wind power generation, and provide the system with more peak-shaving and valley-filling capacity and frequency modulation, phase modulation, emergency backup power, and reliability powerful.

Description

A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage

technical field

The invention relates to a reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage, and belongs to the fields of wind-solar hybrid power generation technology, seawater pumped storage technology, seawater desalination technology, intelligent control technology and the like.

Background technique

There are many small islands off the mainland in my country (with an area of 500m2~5km2, accounting for about 98% of the total number of islands in the country), and the power grid is difficult to reach. Most areas use diesel engines to generate electricity. With the shortage of oil and the rise of oil prices, the cost of power generation is increasing rapidly. As a result, the shortage of electric energy directly restricts the economic development of small islands and the daily life of residents. Some islands are even gradually abandoned, and most small islands are facing such problems as power shortages and draft difficulties. The island area is rich in wind energy resources, which provides good innate conditions for solving the problem of electricity consumption in remote areas. In response to these situations, most islands now use wind energy for power supply.

The current wind-solar hybrid power generation system generally uses batteries to store energy, but batteries have short life, high cost, pollution, and cannot store a large amount of electric energy. Seawater pumped storage, like conventional pumped storage, can not only store a large amount of electric energy, adjust peaks and fill valleys, but also has rapid start-up, fast climbing and unloading speed, flexible and reliable operation, independent of fresh water resources, low construction cost, and reliable energy production. and environmental advantages. Its fast-changing flexibility can make up for the randomness and unevenness of wind and solar energy on the island, and provide the system with more peak-shaving and valley-filling capacity, as well as frequency modulation, phase modulation, emergency backup power, etc. Therefore, seawater pumped storage is used to store energy for the wind-solar hybrid power generation system. Since it takes a certain amount of time to start and stop the pumped storage unit, and there is an 'S' unstable zone in the reversible pump-turbine, during this period, the system loses power or the electric energy cannot be consumed, so the system is configured with a certain amount of storage battery. It not only solves the above problems, but also can balance a certain amount of system energy.

The combination of seawater desalination and renewable energy systems can effectively solve the problem of energy consumption and water use on the island, and seawater desalination has good adaptability and dispatchability, and can solve the matching problem of load and output. Seawater desalination has the characteristics of variable load, adjustable and high energy consumption. Combined with renewable energy, when the output is large, more water will be produced; when the output is small, less water will be produced. It can adapt to the output fluctuation of renewable energy to a certain extent and play an important role in the energy balance of the system.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage.

In order to achieve the above purpose, the present invention provides a reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage, including valves, photovoltaic arrays, wind generators, inverters, controllers, high-level storage tanks, low-level Reservoir, reversible water pump-turbine unit, storage battery and load; the photovoltaic array includes several photovoltaic power generation panels distributed at equal intervals, the wind power generator and the photovoltaic array are fixed on the ground, and the wind power generator The inverter and the photovoltaic array are electrically connected to the inverter respectively; The pool is provided with a channel connecting the low-level water storage tank, the valve is installed on the channel, and the reversible pump-turbine unit is installed on the channel; the inverter, the reversible pump-turbine unit, The load and the storage battery are respectively electrically connected to the controller, and the load is electrically connected to the storage battery.

Preferably, the high level reservoir is 100-200 meters higher than the low level reservoir.

Preferably, the reversible pump-turbine unit includes a water pump working condition and a water turbine working condition, the water pump working condition includes a water pump, a water inlet pipe and a water outlet pipe, and the water inlet of the water pump is connected to the low-level water storage through the water inlet pipe The water outlet of the water pump is connected to the high-level water storage tank through the water outlet pipe; the working condition of the water turbine includes a water turbine, and the water turbine is fixedly arranged on the channel.

Preferably, a reverse osmosis seawater desalination device is included, the reverse osmosis seawater desalination device includes a water intake system, a pretreatment module, a reverse osmosis desalination module and a post-treatment module, the water intake system includes a water intake pipe, a water intake pump and a water intake tank, the The water intake pump is arranged on the water intake pipe, one end of the water intake pipe communicates with the low-level reservoir, the other end of the water intake pipe communicates with the water intake tank, the water intake tank communicates with the pretreatment module, and the The pretreatment module communicates with the reverse osmosis desalination module, and the posttreatment module is installed on the reverse osmosis desalination module.

Preferably, the pretreatment module includes a water suction pipe, a feed water pump, a multi-media filter and a security filter, the water intake tank communicates with the multi-media filter through the water suction pipe, and the water feed pump is installed on the pump On the water pipe, the multimedia filter is connected to the security filter, and the security filter is connected to the reverse osmosis desalination module.

Preferably, the model of the multimedia filter is HKY-DZL08; the security filter is a bag filter.

Preferably, the reverse osmosis desalination module includes a water inlet pipe, a high-pressure pump, a reverse osmosis membrane module and a produced water tank, the security filter communicates with the reverse osmosis membrane module through the water inlet pipe, and the high-pressure pump is installed on the On the water inlet pipe, the reverse osmosis membrane module communicates with the produced water tank.

Preferably, the post-processing module includes an energy recovery device, the energy recovery device is a PX-45S positive displacement pressure exchanger, and the water outlet of the security filter and the water outlet of the reverse osmosis membrane module are respectively connected to the energy The water inlet of the recovery device, the water outlet of the energy recovery device is connected to the water inlet of the reverse osmosis membrane module.

Preferably, the reverse osmosis membrane module uses eight Dow seawater membrane elements to be subpackaged in four pressure membrane shells, and the four pressure membrane shells are stacked and arranged sequentially from top to bottom, and the high-pressure pump communicates with the four pressure membrane elements. The left end of the membrane shell and the right end of the four pressure membrane shells communicate with the water production tank.

Preferably, the Dow seawater membrane element is SW30HRLE-400 model; the pressure membrane shell adopts R8040C100S-4W, 1000psi, 4 cores.

The beneficial effect that the present invention reaches:

(1) The pumped storage device in the present invention can store a large amount of electric energy, use seawater as a low-level storage tank, save construction costs, and, like conventional pumped storage devices, can adjust peaks and fill valleys, start and stop the unit quickly, and operate sensitively and reliably , its rapidly changing characteristics can make up for the instability of wind power generation, provide the system with more peak-shaving and valley-filling capacity, frequency modulation, phase modulation, emergency backup power, etc., and have the advantages of reliable energy production and environmental protection; the present invention Cleverly combining pumped storage with wind-solar hybrid power generation system, on the one hand, it can replace the battery to store energy for the whole system, and on the other hand, it also improves the stability of the whole system; the system is still equipped with a battery to bear the instantaneous peak load , which increases the stability of the system; for the lack of fresh water in the island, the system combines seawater desalination devices to effectively solve the problem of fresh water for the island.

(2) The device of the present invention aims at the problems of lack of conventional energy, lack of electric energy and fresh water on small sea islands. It can not only effectively utilize local abundant wind energy, solar energy resources and seawater resources, but also utilize wind and solar complementary power generation, and combine seawater pumped storage power stations with batteries Energy storage, supplying seawater desalination device to produce fresh water. When the wind energy and solar energy supply loads in the system have excess electric energy, the water pump working condition of the reversible water pump turbine is used to pump water, and the seawater in the low-level storage tank is pumped to the high-level storage tank, and the excess electric energy is converted into water energy and stored; When the wind energy and solar energy supply the load with insufficient electric energy, the reversible water pump turbine is used to generate electricity, and the water energy is converted into electric energy, which is connected to the seawater desalination device to supply the load. It not only solves the problem of local power shortage, but also provides fresh water for local residents. The system is stable, environmentally friendly, and has low operating costs.

Description of drawings

Fig. 1 is a sectional view of the present invention;

Fig. 2 is the functional block diagram of reverse osmosis seawater desalination device among the present invention;

Fig. 3 is a schematic diagram of the integration of wind energy, light energy and seawater pumping and storage in the present invention.

In the figure, 1-photovoltaic array, 2-wind generator, 3-inverter, 4-controller, 5-high storage tank, 6-reversible water pump turbine unit, 7-low storage tank, 8-battery , 9-load, 10-water pump working condition, 11-hydraulic turbine working condition, 12-alpine, 13-water intake system, 14-feed water pump, 15-multimedia filter, 16-security filter, 17-high pressure pump, 18 - Reverse osmosis membrane module, 19 - produced water tank, 20 - energy recovery device, 21 - water intake tank, 22 - pretreatment module, 23 - reverse osmosis desalination module, 24 - post treatment module, 25 - control module.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

A reverse osmosis seawater desalination device integrating wind energy, solar energy and seawater energy storage, including valves, photovoltaic arrays 1, wind generators 2, inverters 3, controllers 5, high storage tanks 5, and low storage tanks 7. Reversible water pump turbine unit 6, storage battery 8 and load 9; photovoltaic array 1 includes several photovoltaic power generation panels distributed at equal intervals, wind power generator 2 and photovoltaic array 1 are fixed on the ground, wind power generator 2, photovoltaic The array 1 is electrically connected to the inverter 3; the inverter 3 is electrically connected to the controller 5; A channel, valves are installed on the channel, reversible pump-turbine unit 6 is installed on the channel;

Further, the position of the high-level reservoir 5 is 100-200 meters higher than the low-level reservoir 7 .

Further, the reversible pump-turbine unit 6 includes a water pump working condition 10 and a water turbine working condition 11. The water pump working condition 10 includes a water pump, a water inlet pipe and a water outlet pipe, and the water inlet of the water pump is connected to the low-level water storage through the water inlet pipe. Pool 7, the water outlet of the water pump communicates with the high-level reservoir 5 through the water outlet pipe; the water turbine working condition 11 includes a water turbine, and the water turbine is fixedly arranged on the passage.

Further, the load 9 includes a reverse osmosis seawater desalination device, the reverse osmosis seawater desalination device includes a water intake system 13, a pretreatment module 22, a reverse osmosis desalination module 23 and a post-treatment module 24, and the water intake system 13 includes a water intake pipe, a water intake pump and a water intake tank 21. The water intake pump is placed on the water intake pipe. One end of the water intake pipe is connected to the low-level reservoir 7, and the other end of the water intake pipe is connected to the water intake tank 21. The water intake tank 21 is connected to the pretreatment module 22, and the pretreatment module 22 is connected to the reverse osmosis desalination module 23 , the post-treatment module 24 is installed on the reverse osmosis desalination module 23 .

Seawater desalination adopts reverse osmosis membrane method and adopts modular device, as shown in Figure 2. Water intake module 21: use the water intake system to extract seawater; pretreatment module 22: use feedwater pump 14 to filter seawater through multimedia filter 15 and security filter 16; reverse osmosis desalination module 23: use high-pressure pump 7 to increase the pressure on the seawater side, Press the water molecules in the seawater to the other side of the osmotic membrane in the reverse osmosis membrane module 18 to generate fresh water and send it to the produced water tank 19; the post-processing module 24: use the energy recovery device to effectively recover the energy in the seawater desalination process to achieve Energy-saving effect; control module 25: control the progress of the whole process; use this device to turn sea water into fresh water for domestic water.

Further, the pretreatment module 22 includes a water suction pipe, a feed water pump 14, a multimedia filter 15 and a security filter 16, the water intake tank 21 is connected to the multimedia filter 15 through the water suction pipe, the water feed pump 14 is installed on the water suction pipe, and the multimedia The filter 15 is connected to a security filter 16 , and the security filter 16 is connected to a reverse osmosis desalination module 23 .

Further, the model of the multimedia filter 15 is HKY-DZL08; the security filter 16 is a bag filter.

Further, the reverse osmosis desalination module includes a water inlet pipe, a high-pressure pump 17, a reverse osmosis membrane module 18, and a produced water tank 19. The security filter 16 is connected to the reverse osmosis membrane module 18 through the water inlet pipe, and the high-pressure pump is installed on the water inlet pipe. The membrane module 18 communicates with the product water tank 19 .

Further, the post-processing module 24 includes an energy recovery device 20, the energy recovery device 20 is a PX-45S positive displacement pressure exchanger, and the water outlet of the security filter 16 and the water outlet of the reverse osmosis membrane module 18 are respectively connected The water inlet of the energy recovery device 20 is connected to the water inlet of the reverse osmosis membrane module 18 .

The low-pressure seawater flowing out of the outlet pipe of the security filter 16 enters the energy recovery device 20 from one end, and the high-pressure concentrated brine at the outlet of the reverse osmosis membrane module 18 enters the energy recovery device 20 from the other end, and the pressure energy is in the energy recovery device 20. After the exchange in the energy recovery device 20 , the low-pressure seawater is transformed into high-pressure seawater and flows out into the water inlet pipe between the high-pressure pump 17 and the reverse osmosis membrane module 18 .

Further, the reverse osmosis membrane module 18 uses eight 8-inch Dow seawater membrane elements to be packed in four pressure membrane shells, and the four pressure membrane shells are stacked and arranged sequentially from top to bottom, and the high-pressure pump 17 is connected to the four pressure membrane shells. The left end of the four pressure membrane shells communicates with the produced water tank 19 at the right end.

Furthermore, the Dow seawater membrane element is SW30HRLE-400 model; the pressure membrane shell adopts R8040C100S-4W, 1000psi, 4 cores.

Working process of the present invention:

Build a reservoir on a high mountain with a certain distance from the sea on a small island as the high-level reservoir 5 of the system, install a wind turbine 2 at a place with better wind flow conditions around the reservoir on the top of the mountain, and lay photovoltaic panels on the sunny side of the hillside. The photovoltaic array 1 uses the ocean as the low-level reservoir 7, and a reversible pump-turbine unit 6 is arranged on the connecting channel between the high-level reservoir 5 and the low-level reservoir 7. The reversible pump-turbine unit 6 has the described The water pump operation condition 10 in which the water in the low-level reservoir 7 is pumped into the high-level reservoir 5 and the water turbine operation condition 11 in which the water in the high-level reservoir flows to the low-level reservoir 7 for power generation, The formed wind energy-solar energy-seawater pumping and storage integrated power generation system, the process flow is shown in Figure 3, and the reverse osmosis seawater desalination device is connected through the controller 4.

①Wind power generation uses wind turbines to convert wind energy into mechanical energy, and wind generators convert mechanical energy into electrical energy. Solar power generation uses the photovoltaic effect of photovoltaic panels to convert light energy into electrical energy, and then charges the battery through the controller. Supply power to the load through the inverter;

②The seawater pumped storage part is composed of reversible water pump turbine unit, high water level storage tank, low level storage tank and channel. When it is running in the pump mode, it can pump water and pump the seawater from the low level storage tank to the high level water storage pool, which converts electrical energy into water energy and stores it; when operating in the turbine working condition, the water level difference between high and low water level seawater storage tanks can be used to generate electricity, turning water energy into electrical energy; during the low load period, the reversible water pump turbine operates In the working condition of the water pump, the excess electric energy is used to pump the water from the low-level storage tank to the high-level storage tank, and the electric energy is converted into water energy for storage; during the peak load period, the reversible water pump-turbine operates under the turbine working condition, and the high and low water level is used to store water The water level difference in the pool generates electricity, converting water energy into electrical energy.

③The inverter converts the direct current in the battery into a standard 220V alternating current to ensure the normal use of alternating current load equipment. At the same time, it also has an automatic voltage stabilization function, which can improve the power supply quality of the wind-solar hybrid power generation system;

④ The controller 4 continuously switches and adjusts the working state of the storage battery 8 according to changes in the intensity of sunlight, wind force and load. First, the electric energy converted from wind energy and solar energy is sent to the load, and then the excess electric energy converted from wind energy and solar energy is sent to the battery for storage. After the battery is full, the remaining electric energy converted from wind energy and solar energy is used It is used in the pumping condition of the reversible water pump turbine unit to convert electric energy into water energy and store it. When the power generation cannot meet the load demand, the controller sends the electric energy of the battery to the load. When the battery can not meet the load, the controller adjusts the operating condition of the reversible pump-turbine unit to the turbine operating condition to generate electricity and supply the load, ensuring The continuity and stability of the whole system work. ⑤ The battery part is composed of multiple batteries, which play the role of energy regulation, load balancing and instantaneous load bearing in the system. It converts the electrical energy output by the wind-solar hybrid power generation system into chemical energy and stores it for use when the power supply is insufficient.

The present invention adopts four advantages of the seawater pumped storage device: first, the ocean is used as a low-level water storage tank, and no additional low-level water storage tanks need to be built, and it does not rely on fresh water resources, saving construction costs and fresh water; second, energy storage, which will soon The excess electric energy of wind power generation is stored; the third is peak regulation, that is, adjust the frequency of the unit according to the load change, and perform peak regulation on the system; the fourth is frequency regulation, that is, according to the change of the system frequency, when the system frequency exceeds the specified normal range, Increase or decrease the output of the unit to achieve a new balance, and control the frequency change of the system within a certain range to ensure the stability of the system. Using the ocean as a low-level reservoir can make full use of seawater resources; the energy storage function can make full use of wind energy and solar energy resources; peak shaving and frequency regulation take advantage of the rapid start and stop of hydroelectric units.

The present invention improves on the traditional wind-solar hybrid power generation system, and replaces part of the storage battery with a seawater pumped storage power station. On the one hand, it increases the storage capacity, and on the other hand, it also increases the stability of the system; the system is equipped with modularization The seawater desalination device enables the system not only to meet the electricity demand of small island residents, but also to provide fresh water; at the same time, the invention can utilize the abundant wind energy and seawater resources of the island, which not only saves fossil energy, but also solves the problem of conventional pumped storage power plants. Dependence on fresh water resources.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A reverse osmosis seawater desalination device integrating wind energy, solar energy and seawater energy storage, characterized in that it includes a valve, a photovoltaic array (1), a wind generator (2), an inverter (3), and a controller (5), high-level water storage tank (5), low-level water storage tank (7), reversible water pump turbine unit (6), storage battery (8), the photovoltaic array (1) includes several equally spaced distribution of photovoltaic power generation plate, the wind generator (2) and the photovoltaic array (1) are fixed on the ground, and the wind generator (2) and the photovoltaic array (1) are respectively electrically connected to the inverter ( 3); the inverter (3) is electrically connected to the controller (5), the high-level water storage tank (5) is set at a place higher than the low-level water storage tank (7), and the high-level water storage tank (5) The pool (5) has a channel connected to the low-level water storage tank (7), the valve is installed on the channel, and the reversible pump-turbine unit (6) is installed on the channel; the inverter (3), the reversible pump-turbine unit (6), and the storage battery (8) are respectively electrically connected to the controller (4). 2. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 1, characterized in that the position of the high-level water storage tank (5) is higher than that of the low-level water storage Pool (7) 100-200 meters. 3. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 1, characterized in that, the reversible pump-turbine unit (6) includes pump working conditions (10) and In the water turbine working condition (11), the water pump working condition (10) includes a water pump, a water inlet pipe and a water outlet pipe, the water inlet of the water pump is connected to the low-level water storage tank (7) through the water inlet pipe, and the water pump The water outlet is connected to the high-level water storage tank (5) through the water outlet pipe; the water turbine working condition (11) includes a water turbine, and the water turbine is fixedly arranged on the channel. 4. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 1, characterized in that it includes a reverse osmosis seawater desalination device, and the reverse osmosis seawater desalination device includes a water intake system ( 13), a pretreatment module (22), a reverse osmosis desalination module (23) and a post-treatment module (24), the water intake system (13) includes a water intake pipe, a water intake pump and a water intake tank (21), and the water intake pump is placed On the water intake pipe, one end of the water intake pipe communicates with the low-level reservoir (7), the other end of the water intake pipe communicates with the water intake tank (21), and the water intake tank (21) communicates with the A pretreatment module (22), the pretreatment module (22) is connected to the reverse osmosis desalination module (23), and the posttreatment module (24) is installed on the reverse osmosis desalination module (23). 5. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 4, characterized in that the pretreatment module (22) includes a suction pipe, a feedwater pump (14), Multi-media filter (15) and security filter (16), the water intake tank (21) is connected to the multi-media filter (15) through the suction pipe, and the water supply pump (14) is installed on the pump On the water pipe, the multimedia filter (15) is connected to the security filter (16), and the security filter (16) is connected to the reverse osmosis desalination module (23). 6. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 5, characterized in that, the model of the multimedia filter (15) is HKY-DZL08; the security Filter (16) is a bag filter. 7. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 5, characterized in that the reverse osmosis desalination module includes a water inlet pipe, a high-pressure pump (17), a reverse osmosis Membrane module (18) and produced water tank (19), the security filter (16) communicates with the reverse osmosis membrane module (18) through the water inlet pipe, and the high-pressure pump is installed on the water inlet pipe. The reverse osmosis membrane module (18) communicates with the product water tank (19). 8. The reverse osmosis seawater desalination device integrating wind energy, solar energy and seawater energy storage according to claim 7, characterized in that the post-processing module (24) includes an energy recovery device (20), and the The energy recovery device (20) is a PX-45S positive displacement pressure exchanger, and the water outlet of the security filter (16) and the water outlet of the reverse osmosis membrane module (18) are respectively connected to the energy recovery device (20) A water port, the water outlet of the energy recovery device (20) communicates with the water inlet of the reverse osmosis membrane module (18). 9. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 7, characterized in that the reverse osmosis membrane module (18) is divided into eight Dow seawater membrane elements Installed in four pressure membrane shells, the four pressure membrane shells are stacked and arranged sequentially from top to bottom, the high-pressure pump (17) is connected to the left end of the four pressure membrane shells, and the right end of the four pressure membrane shells is connected to The product water tank (19). 10. A reverse osmosis seawater desalination device integrating wind energy, light energy and seawater energy storage according to claim 9, characterized in that, the Dow seawater membrane element is SW30HRLE-400 model; the pressure membrane shell Using R8040C100S-4W, 1000psi, 4 cores.