CN211813952U - Seawater resource utilization system - Google Patents
Seawater resource utilization system Download PDFInfo
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- CN211813952U CN211813952U CN202020167842.7U CN202020167842U CN211813952U CN 211813952 U CN211813952 U CN 211813952U CN 202020167842 U CN202020167842 U CN 202020167842U CN 211813952 U CN211813952 U CN 211813952U
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- seawater
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- struvite
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Abstract
The utility model relates to a sea water resource utilization system. Comprises a struvite reaction device, a first dosing device, a concentrated seawater feeding device, a centrifugal device, a chlorine dioxide generation device, a reaction device, a second dosing device, a filtering device, an evaporation device and a crystallization device; the first chemical adding device and the concentrated seawater adding device are respectively connected with the struvite reaction device, the struvite reaction device is sequentially connected with the centrifugal device, the reaction device, the filtering device, the evaporation device and the crystallization device, and the chlorine dioxide generating device and the second chemical adding device are respectively connected with the reaction tank. The production of struvite and the salt and alkali can realize the zero discharge of seawater.
Description
Technical Field
The utility model belongs to the technical field of the sea water desalination, concretely relates to sea water resource utilization system.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
At present, fresh water resources in China are poor and uneven due to distribution of time and regions, and the water sharing amount of people is small. In recent years, economy is rapidly developed, water resource pollution is serious, and the contradiction of water supply is more prominent due to the reduction of precipitation. The coastal economy circle has highly centralized population and rapid economic development, and the problem of water shortage becomes a key factor for restricting the economic development. Coastal cities have abundant seawater resources, so that the seawater resources are fully utilized to desalt the seawater so as to solve the problem of shortage of fresh water resources.
Although there are many kinds of sea water desalination process, the methods suitable for large-scale sea water desalination only comprise multi-stage flash evaporation, multi-effect evaporation, reverse osmosis membrane component method and the like. The distillation method has the advantages of early appearance, mature technology, simple and reliable equipment, less limitation by the concentration of raw water and higher product water quality. However, the investment cost and the energy consumption of the device are high, the technical advantages of the device are lost, and the device gradually falls into the valley. In recent years, membrane methods have been developed at an astonishing rate, and a method for separating salt and water molecules in seawater solution by using natural or synthetic polymer membranes and using external energy or chemical potential difference as a driving force is adopted. Because the phase change does not exist in the process and the energy consumption is less, the membrane method increasingly shows economic and technical advantages of investment saving, low energy consumption, small occupied area, short construction period, easy automatic control, quick start operation, safety, reliability and the like.
The technology of seawater desalination is developed for decades, the technology is mature day by day, the economy is reasonable day by day, but a large amount of high-salinity seawater generated after seawater desalination generally generates about 0.65t of seawater with salinity of more than 52 after 1t of seawater desalination, wherein the seawater contains high-concentration calcium, magnesium, nitrogen and phosphorus, and the concentrated seawater is treated by a direct discharge mode, so that not only can the resource waste be caused to a great extent, but also some biological death can be caused, huge threats can be caused to the environment, and the problems of seawater recycling and zero discharge cannot be thoroughly solved.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the above-mentioned prior art, the utility model aims at providing a sea water utilization system. The technical scheme of the utility model the problem of sea water desalination and concentrated seawater resource utilization has been solved. The concentrated seawater is the concentrated brine after the seawater desalination, through the utility model discloses a processing of resourceful device and method produces struvite, salt-making system alkali, realizes the zero release of seawater.
In order to solve the technical problem, the technical scheme of the utility model is that:
a seawater resource utilization system comprises a struvite reaction device, a first dosing device, a concentrated seawater feeding device, a centrifugal device, a chlorine dioxide generation device, a reaction device, a second dosing device, a filtering device, an evaporation device and a crystallization device;
the first chemical adding device and the concentrated seawater adding device are respectively connected with the struvite reaction device, the struvite reaction device is sequentially connected with the centrifugal device, the reaction device, the filtering device, the evaporation device and the crystallization device, and the chlorine dioxide generating device and the second chemical adding device are respectively connected with the reaction tank.
The utility model discloses the reaction of medium-concentration seawater in struvite reaction unit obtains the struvite crystallization, then through centrifugal device separation struvite crystallization and surplus seawater, during surplus seawater lets in reaction unit, let in chlorine dioxide denitrogenation among the reaction unit, then add calcium chloride, sodium carbonate dephosphorization and calcium magnesium ion that removes through second charge device, separate through filter equipment and deposit, liquid after the filtration gets into evaporation plant, concentrate in evaporation plant, the concentrate enters into crystallization device, obtain the sodium chloride crystallization. Solves the problem that the prior concentrated seawater is not comprehensively utilized. The concentrated seawater effectively utilizes seawater resources by removing phosphorus, nitrogen and calcium and magnesium, and solves the problem of shortage of fresh water resources.
In some embodiments of the present invention, the device for adding concentrated seawater comprises a concentrated seawater storage device, a seawater pump, a filter, and a flowmeter.
In some embodiments of the utility model, the seawater recycling system includes a first cryostat, and the struvite reaction unit is connected with the first cryostat. The low-temperature constant-temperature circulating device is used for carrying out low-temperature constant-temperature treatment on the struvite reaction device.
As some embodiments of the utility model, filter equipment is plate and frame filter press, and plate and frame filter press's liquid outlet is connected with reaction unit, sets up the flowmeter between filter equipment and the evaporimeter.
As some embodiments of the present invention, the seawater recycling system includes a steam generator, and the evaporation device is connected to the steam generator. The evaporator provides a heat source for evaporation for the evaporation device.
As some embodiments of the utility model, sea water resource system includes condensing equipment, dashpot, condensate pump, and evaporation plant is connected with condensing equipment, dashpot, condensate pump in proper order. The evaporated steam is condensed to obtain condensed water, and the condensed water is discharged through a buffer tank and a condensed water pump.
As some embodiments of the utility model, the seawater recycling system includes the second low-temperature constant-temperature circulation device, and the crystallization device is connected with the second low-temperature constant-temperature circulation device. The second low-temperature constant-temperature circulating device is used for carrying out low-temperature constant-temperature treatment on the crystallization device.
As some embodiments of the utility model, the seawater recycling system comprises an aeration device and an aerator, the aeration device is arranged in the reaction device, and the aeration device is connected with the aerator outside the reaction device.
The utility model has the advantages that:
the boron and the chemical are removed from the fresh seawater to produce drinking water, and the zero discharge of the salt and alkali production from the concentrated seawater is realized. Further, a set of demonstration device for seawater desalination and recycling is built, and technical support is provided for the optimization and application and popularization of the seawater desalination and recycling technical scheme.
The utility model discloses combine reverse osmosis membrane subassembly to realize the desalination process of sea water to utilize nuclear power plant's nuclear energy to solve huge energy resource consumption problem in the sea water desalination, thereby reduce cost. The nuclear energy is utilized to provide a large amount of cheap energy, so that the contradiction between supply and demand of the existing energy is relieved, and the problem of environmental pollution caused by burning a large amount of fossil fuel can be solved.
The utility model discloses contain elements such as nitrogen, phosphorus in the struvite of recovery, the clearance is high and can regard as slow-release fertilizer to can reduce the pollution that strong brine discharge caused the environment.
The utility model discloses a desalination after reverse osmosis still need carry out the secondary purification through removing boron and adding the medicine for the quality of fresh water meets the requirements more, and the replenishment of sea water, the taking out of fresh water are all controllable, and intelligent degree is high.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention unduly.
Fig. 1 is a diagram of a seawater resource utilization system according to embodiment 1 of the present invention;
the device comprises a first dosing device, a concentrated seawater storage device, a seawater pump, a filter, a flowmeter, a first low-temperature constant-temperature circulating device, a second low-temperature constant-temperature circulating device, a third low-temperature constant-temperature circulating device, a fourth low-temperature constant-temperature circulating device, a fifth low-temperature constant-temperature circulating device, a sixth.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The present invention will be further explained with reference to the following examples
Example 1
As shown in fig. 1, the seawater resource utilization system of the present invention comprises a struvite reaction device 7, a first chemical adding device 1, a concentrated seawater adding device, a centrifugal device 8, a chlorine dioxide generating device 9, a reaction device 10, a second chemical adding device 12, a filtering device, an evaporation device 13, and a crystallization device 15;
the first chemical adding device 1 and the concentrated seawater adding device are respectively connected with a struvite reaction device 7, the struvite reaction device 7 is sequentially connected with a centrifugal device 8, a reaction device 10, a filtering device, an evaporation device 13 and a crystallization device 15, and the chlorine dioxide generating device 9 and the second chemical adding device 12 are respectively connected with the reaction device 10.
The concentrated seawater adding device comprises a concentrated seawater storage device 2, a seawater pump 3, a filter 4 and a flowmeter 5. The flow meter 5 can obtain the amount of the concentrated seawater to be added.
The seawater recycling system comprises a first low-temperature constant-temperature circulating device 6, and a struvite reaction device 7 is connected with the first low-temperature constant-temperature circulating device 6.
The reaction device is internally provided with an aeration device, the aerator 20 is arranged outside the reaction device, and the aerator 20 is connected with the aeration device of the reaction device. Air is introduced into the reaction device through the aeration device.
The filtering device is a plate-and-frame filter press 11, a liquid outlet of the plate-and-frame filter press 11 is connected with the reaction device 10, and a flowmeter is arranged between the filtering device and the evaporator.
The seawater recycling system comprises a steam generator 14, and an evaporation device 13 is connected with the steam generator 14.
The seawater recycling system comprises a condensing device 17, a buffer tank 18 and a condensate pump 19, and the evaporating device 13 is sequentially connected with the condensing device 17, the buffer tank 18 and the condensate pump 19.
The seawater recycling system comprises a second low-temperature constant-temperature circulating device 16, and a crystallizing device 15 is connected with the second low-temperature constant-temperature circulating device 16.
The medicine in the first medicine adding device 1 is conveyed to the struvite reaction device 7 through a pump. Struvite crystallization is completed in struvite reaction unit 7. The crystals and the mother liquor are then centrifuged by the centrifuge 8 and the mother liquor is fed to the reactor 10. After the reaction of the reaction device 10, the liquid enters a plate-and-frame filter press 11 through a centrifugal pump, filter mother liquor is obtained after filter pressing, one part of the filter mother liquor returns to the reaction device 10, the other part of the filter mother liquor enters an evaporation device 13, and the filtered mother liquor enters a crystallization device 15 after evaporation.
The concentrated seawater storage device 2 may be a concentrated seawater storage tank or a concentrated seawater storage tank, etc.
The struvite reaction device 7 can be a struvite crystallization kettle or a struvite crystallization tank and the like.
The first low-temperature constant-temperature circulating device 6 and the second low-temperature constant-temperature circulating device 16 respectively provide condensing mediums for the struvite reaction device 7 and the crystallization device 15.
The condensing means 17 may be a condenser. The centrifuge device 8 may be a centrifuge. The evaporation device may be a falling film concentration evaporator.
Example 2
Seawater is introduced from a sea area (belonging to east China sea) near a certain nuclear power station to a reverse osmosis membrane module, and the fresh water yield is designed to be 500m3And d. Seawater is a complex system, especially in the sea area near land, and contains a large amount of colloids, suspended particles, microorganisms, bacteria, dissolved organic matter and inorganic matter. In order to prolong the service life of the reverse osmosis membrane and reduce the cost of seawater desalination, the reverse osmosis membrane enters a pretreatment unit of a flocculation, sand filtration and ultrafiltration membrane component before entering the reverse osmosis membrane component. The content of boron in seawater in fresh water still exceeds the standard after passing through the reverse osmosis membrane module, and the fresh water is collected, then the boron dosing unit is removed, and finally the fresh water is converged into a pipe network for use.
The concentrated seawater is firstly collected into a concentrated seawater storage device 2, after reaching a certain liquid level (40-60% liquid level), the concentrated seawater is conveyed to a struvite crystallization kettle 7 by a seawater pump 3, the pH of the solution is adjusted to 9.5 by adopting NaOH solution, the magnesium nitrogen phosphorus ratio (Mg: N: P) in the solution is adjusted to 1.15:1:1, the temperature is reduced, after struvite crystals are separated out and stabilized for 1 hour, a pipeline below the crystallization kettle is placed into a centrifuge (a centrifugal device 8) for centrifugal operation, and struvite crystal products are obtained; the centrifugal mother liquor enters a concentration crystallization salt making unit which comprises a chlorine dioxide generator, a dosing pump, a stirring device, a falling film concentration evaporator, a crystallization kettle, a steam generator, a low-temperature constant-temperature circulating system, a centrifugal machine and the like. Firstly, removing nitrogen from the centrifugal mother liquor by adopting aeration and chlorine dioxide for nitrogen removal; adding calcium chloride to remove phosphorus to obtain white flocculent calcium phosphate precipitate; adding sodium carbonate to remove calcium and magnesium ions to generate calcium and magnesium carbonate precipitate, and separating the generated precipitate and the generated calcium phosphate precipitate by using a plate-and-frame filter press. And finally, adjusting the pH of the filtered mother liquor to 7.0 by adopting hydrochloric acid and a sodium hydroxide standard solution, and concentrating the salt solution by using a falling film concentration evaporator (an evaporation device 13) until crystallization appears. And (4) recycling the evaporated condensate water, cooling and crystallizing the concentrated solution, and performing centrifugal separation to obtain a sodium chloride crystal product. The centrifugal mother liquor returns to the concentration process for application, and zero discharge of wastewater is realized.
The former process of this embodiment is a seawater reverse osmosis device, the capacity of producing fresh water is about 20t/h (self-built by a stone island nuclear power plant, the process and device designed in this patent are used with it, the process is operated for 24 hours every day, the design temperature is 10 ℃), the desalination rate of the system is not less than 99.3%, and the recovery water rate of the seawater reverse osmosis device: not less than 40 percent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A seawater resource utilization system is characterized in that: comprises a struvite reaction device, a first dosing device, a concentrated seawater feeding device, a centrifugal device, a chlorine dioxide generation device, a reaction device, a second dosing device, a filtering device, an evaporation device and a crystallization device;
the first chemical adding device and the concentrated seawater adding device are respectively connected with the struvite reaction device, the struvite reaction device is sequentially connected with the centrifugal device, the reaction device, the filtering device, the evaporation device and the crystallization device, and the chlorine dioxide generating device and the second chemical adding device are respectively connected with the reaction tank.
2. The seawater resource utilization system according to claim 1, characterized in that: the concentrated seawater adding device comprises a concentrated seawater storage device, a seawater pump, a filter and a flowmeter.
3. The seawater resource utilization system according to claim 1, characterized in that: the seawater recycling system comprises a first low-temperature constant-temperature circulating device, and the struvite reaction device is connected with the first low-temperature constant-temperature circulating device.
4. The seawater resource utilization system according to claim 1, characterized in that: the filtering device is a plate-and-frame filter press, a liquid outlet of the plate-and-frame filter press is connected with the reaction device, and a flowmeter is arranged between the filtering device and the evaporator.
5. The seawater resource utilization system according to claim 1, characterized in that: the seawater recycling system comprises a steam generator, and the evaporation plant is connected with the steam generator.
6. The seawater resource utilization system according to claim 1, characterized in that: the seawater recycling system comprises a condensing device, a buffer tank and a condensate pump, and the evaporating device is sequentially connected with the condensing device, the buffer tank and the condensate pump.
7. The seawater resource utilization system according to claim 1, characterized in that: the seawater recycling system comprises a second low-temperature constant-temperature circulating device, a crystallizing device and a second low-temperature constant-temperature circulating device.
8. The seawater resource utilization system according to claim 1, characterized in that: the seawater recycling system comprises an aeration device and an aerator, wherein the aeration device is arranged in the reaction device, and the aeration device is connected with the aerator outside the reaction device.
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| CN202020167842.7U CN211813952U (en) | 2020-02-13 | 2020-02-13 | Seawater resource utilization system |
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| CN111138020A (en) * | 2020-02-13 | 2020-05-12 | 山东师范大学 | Seawater resource utilization system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111138020A (en) * | 2020-02-13 | 2020-05-12 | 山东师范大学 | Seawater resource utilization system and method |
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