CN217323465U - Seawater desalination device with water quantity and energy recovery functions - Google Patents
Seawater desalination device with water quantity and energy recovery functions Download PDFInfo
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- CN217323465U CN217323465U CN202220323657.1U CN202220323657U CN217323465U CN 217323465 U CN217323465 U CN 217323465U CN 202220323657 U CN202220323657 U CN 202220323657U CN 217323465 U CN217323465 U CN 217323465U
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- Y02A20/124—Water desalination
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Abstract
A seawater desalination device with water quantity and energy recovery comprises a seawater clean water tank, a first-stage two-section seawater desalination reverse osmosis system and a second-stage low-pressure reverse osmosis system; the first-stage two-section seawater desalination reverse osmosis system comprises a first-stage seawater desalination reverse osmosis system and a second-stage seawater desalination reverse osmosis system; the seawater clean water tank is connected with a first-stage seawater desalination reverse osmosis system through a seawater desalination high-pressure pump, a water production outlet of the first-stage seawater desalination reverse osmosis system is connected with a first-stage water production tank, a concentrated water outlet is directly connected with a second-stage seawater desalination reverse osmosis system, a water production outlet of the second-stage seawater desalination reverse osmosis system is connected with a second-stage water production tank, and the concentrated water outlet is connected with an energy recovery device I; the second-stage water production tank is directly connected with the second-stage low-pressure reverse osmosis system, the water production outlet of the second-stage low-pressure reverse osmosis system is connected with the first-stage water production tank, the concentrated water outlet is connected with the energy recovery device II, and the water outlet of the energy recovery device II is connected to the seawater clean water tank in a return mode. The invention can reduce the consumption of seawater and the pretreatment scale, and recover the energy of concentrated water to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of seawater desalination treatment, and particularly relates to a seawater desalination device with water quantity and energy recovery functions.
Background
The mainstream seawater desalination technology at present mainly comprises a reverse osmosis method and a thermal desalination method. The conventional reverse osmosis method generally adopts a one-stage (7-core or 8-core) reverse osmosis system, and main equipment mainly comprises a high-pressure pump, a reverse osmosis membrane and an energy recovery part. The seawater enters a seawater clean water tank after passing through a seawater regulating tank and a pretreatment unit, is filtered by a security filter through a booster pump and is pressurized by a high-pressure pump to enter a first-stage seawater reverse osmosis system, the water produced by the corresponding reverse osmosis system is used as domestic water or production water, and the concentrated water of the reverse osmosis system is directly discharged after being recovered by an energy device. Generally, the recovery rate of a seawater reverse osmosis system is low (40-45%), the utilization rate of seawater is low, the using amount is large, the scale of pretreatment facilities is increased, and the cost per ton of water is high. How to upgrade on the basis of the existing system, improve the recovery rate of a reverse osmosis system, reduce the cost per ton of seawater desalination projects, and realize the maximum recycling of water and energy is a difficult problem in the large-scale engineering application process of seawater desalination by a reverse osmosis membrane method at present and is also a key problem to be solved urgently in the subsequent large-scale popularization and application engineering.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a seawater desalination device with water quantity and energy recovery, which can improve the utilization rate of seawater, reduce 25-30% of seawater consumption and pretreatment scale, and reduce pretreatment investment and operation cost; meanwhile, the concentrated water energy can be recovered to the maximum extent, transmission energy consumption units in the system are simplified, dual functions of water quantity and energy recovery are realized, investment and operation cost are saved, and the management is convenient and fast.
In order to achieve the purpose, the invention adopts the technical scheme that:
a seawater desalination device with water quantity and energy recovery comprises a seawater clean water tank, a first-stage two-section seawater desalination reverse osmosis system and a second-stage low-pressure reverse osmosis system; the first-stage two-section seawater desalination reverse osmosis system comprises a first-stage seawater desalination reverse osmosis system and a second-stage seawater desalination reverse osmosis system;
the first-stage seawater desalination reverse osmosis system and the second-stage seawater desalination reverse osmosis system adopt reverse osmosis membrane elements with different permeability coefficients;
the seawater clean water tank is connected with a first-stage seawater desalination reverse osmosis system through a seawater desalination high-pressure pump, a water production outlet of the first-stage seawater desalination reverse osmosis system is connected with a first-stage water production tank, a concentrated water outlet is directly connected with the second-stage seawater desalination reverse osmosis system, a water production outlet of the second-stage seawater desalination reverse osmosis system is connected with a second-stage water production tank, and a concentrated water outlet is connected with an energy recovery device I;
the second-stage water producing pond is directly connected with the second-stage low-pressure reverse osmosis system, a water producing outlet of the second-stage low-pressure reverse osmosis system is connected with the first-stage water producing pond, a concentrated water outlet is connected with an energy recovery device II, and a water outlet of the energy recovery device II is connected back to the seawater clean water pond.
In one embodiment, the water inlet of the seawater clean water pond is connected with a pretreatment unit, and the pretreatment unit consists of a filtering subunit and an ultrafiltration subunit; and a booster pump and a security filter are arranged on a connecting pipeline of the seawater clean water tank and the seawater desalination high-pressure pump.
In one embodiment, the first-stage seawater desalination reverse osmosis system adopts an anti-pollution high-desalination seawater desalination membrane, and the average desalination rate is not lower than 99.8%;
the second-stage seawater desalination reverse osmosis system adopts a reverse osmosis membrane element with the average desalination rate of 90%;
the second-stage low-pressure reverse osmosis system adopts an anti-pollution 41Bar pressure-grade reverse osmosis membrane element.
In one embodiment, a low-pressure protection sensor and a high-pressure protection sensor are respectively arranged in front of and behind the seawater desalination high-pressure pump pipeline at the front end of the section of seawater desalination reverse osmosis system, the seawater desalination high-pressure pump is automatically started when the supply pressure is insufficient, and the seawater desalination high-pressure pump is automatically stopped when the supply pressure exceeds the supply pressure of the section of seawater desalination reverse osmosis system.
In one embodiment, the number, arrangement and operating pressure of the reverse osmosis device pressure vessels in the first-stage seawater desalination reverse osmosis system, the second-stage seawater desalination reverse osmosis system and the second-stage low-pressure reverse osmosis system are calculated and determined according to the water quality.
In one embodiment, the energy recovery device I and the energy recovery device II both adopt positive displacement type energy recovery devices, and recover residual pressure energy by directly pressurizing the feed seawater by using energy in concentrated water of a two-stage seawater desalination reverse osmosis system and a two-stage low-pressure reverse osmosis system, wherein the efficiency is not lower than 95%; a family of ERI energy recovery devices PX that do not require external power is preferred.
In one embodiment, the energy recovery device I and the energy recovery device II can be connected in parallel by a plurality of devices respectively, so as to achieve the required system recovery efficiency (not lower than 98%).
In one embodiment, each reverse osmosis system is provided with local and on-line monitoring instruments such as a thermometer, a pressure gauge, a flowmeter, a conductivity meter, a pressure transmitter and the like; the pressure gauge and the pressure transmitter are used for indicating the operation pressure drop of the reverse osmosis membrane on line and judging the blocking condition of the membrane according to the transmembrane pressure difference and the membrane flux; the flow meter indicates the yield of produced water and concentrated water, and the ratio of the produced water of the concentrated water and the produced water of the fresh water is adjusted according to the yield so that the reverse osmosis system achieves the designed recovery rate of the system; the conductivity meter is used for monitoring the water quality condition of the product water on line.
In one embodiment, the reverse osmosis membrane component is installed on a combined frame, all pipelines and joints are arranged on the combined frame, the combined frame further comprises all brackets, fasteners, clamps and other accessories, and the combined frame is made of carbon steel and is corrosion-resistant; the water inlet of the reverse osmosis equipment is provided with online instruments such as flow, pressure, conductivity and the like, the water outlet of the produced water is provided with online instruments such as flow, pressure, conductivity and pH meter and the like, and the concentrated water outlet is provided with online instruments such as pressure, flow and the like.
The invention also provides a seawater desalination method based on the seawater desalination device with water quantity and energy recovery, pretreated seawater is pressurized and filtered and then sent into a first-stage and second-stage seawater desalination reverse osmosis system, concentrated water I and produced water I are obtained by first-stage seawater desalination reverse osmosis system treatment, the concentrated water I is directly sent to the second-stage seawater desalination reverse osmosis system to be continuously treated to obtain concentrated water II and produced water II, the concentrated water II is sent to an energy recovery device I to recover energy, then the concentrated water II is discharged outside, the produced water II is sent to a second-stage low-pressure reverse osmosis system to be continuously treated by a second-stage water production tank to obtain concentrated water III and produced water III, the concentrated water III is sent to an energy recovery device II to recover energy, and then the concentrated water III is sent back to a seawater clean water tank, wherein the produced water I and the produced water III can be used as target products of domestic water and production water.
Compared with the prior art, the invention has the beneficial effects that:
(1) can improve the utilization rate of seawater, reduce the consumption of seawater and the scale of pretreatment, and reduce the investment and the operation cost of pretreatment.
(2) The concentrated water energy can be recovered to the maximum extent, the transmission energy consumption unit in the system is simplified, the dual functions of water quantity and energy recovery are realized, the investment and the operation cost are saved, and the management is convenient.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention, wherein the solid line is a conventional seawater desalination process unit and the dotted line is an added process unit and piping.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
As shown in the solid line part in fig. 1, in a conventional seawater desalination process unit, seawater passes through a seawater regulating tank and a pretreatment unit, enters a seawater clean water tank, is pressurized by a booster pump and filtered by a cartridge filter, and is finally sent to a first-stage seawater reverse osmosis system by a seawater desalination high-pressure pump for reverse osmosis treatment. In this approach, the seawater utilization rate is not high because the recovery rate of the seawater reverse osmosis system is generally only 40-45%.
Therefore, as shown in a dotted line part in fig. 1, on the basis of a conventional seawater desalination process unit, the invention upgrades the first-stage one-section seawater reverse osmosis system into a first-stage two-section seawater desalination reverse osmosis system, adds a second-stage low-pressure reverse osmosis system and is additionally provided with an energy recovery device, thereby improving the recovery rate of the reverse osmosis system and realizing the maximum recovery and utilization of water quantity and energy under the condition of not dismantling the existing equipment.
Specifically, the seawater desalination device with water quantity and energy recovery mainly comprises a seawater clean water tank, a first-stage two-section seawater desalination reverse osmosis system and a second-stage low-pressure reverse osmosis system.
The seawater clean water tank is a device of a conventional seawater desalination process unit, a water inlet of the seawater clean water tank is connected with the pretreatment unit, a water inlet of the pretreatment unit is connected with the seawater adjusting tank, and the seawater adjusting tank can be directly connected with original seawater. Generally, according to the quality of inlet water, the pretreatment unit preferably consists of a filtering subunit and an ultrafiltration subunit, and suspended matters, colloids and the like in seawater can be well removed in a form of combination of filtering and ultrafiltration, so that the pollution and blockage of a subsequent reverse osmosis membrane are prevented or slowed down, and the stable operation period of a reverse osmosis system is prolonged; the filtration can adopt an air floatation device or a V-shaped filter chamber. Meanwhile, a water outlet pipeline of the seawater clean water tank is provided with a booster pump, a security filter, a seawater desalination high-pressure pump and other equipment.
The one-stage two-stage seawater desalination reverse osmosis system is an upgrade to a conventional one-stage seawater desalination reverse osmosis system and comprises a one-stage seawater desalination reverse osmosis system (i.e., one-stage SWRO1 shown in fig. 1) and a two-stage seawater desalination reverse osmosis system (i.e., two-stage SWRO1 shown in fig. 1).
The water production outlet of the first-stage seawater desalination reverse osmosis system is connected with a first-stage water production tank, the concentrated water outlet is directly connected with a second-stage seawater desalination reverse osmosis system, the water production outlet of the second-stage seawater desalination reverse osmosis system is connected with a second-stage water production tank, and the concentrated water outlet is connected with an energy recovery device I; the second-stage water production tank is directly connected with the second-stage low-pressure reverse osmosis system, the water production outlet of the second-stage low-pressure reverse osmosis system is connected with the first-stage water production tank, the concentrated water outlet is connected with the energy recovery device II, and the water outlet of the energy recovery device II is connected back to the seawater clean water tank.
The operation method comprises the following steps:
the pretreated seawater is pressurized and filtered and then is sent into a first-stage and second-stage seawater desalination reverse osmosis system, the first-stage seawater desalination reverse osmosis system is used for processing to obtain first concentrated water and first produced water, and the first concentrated water is directly sent to a second-stage seawater desalination reverse osmosis system for continuous processing to obtain second concentrated water and second produced water. Namely, an intersegmental booster pump is not needed to be arranged between the first-stage seawater desalination reverse osmosis system and the second-stage seawater desalination reverse osmosis system. And the concentrated water II is sent to an energy recovery device I to recover energy and then is discharged outside, the produced water II is sent to a second-stage low-pressure reverse osmosis system through a second-stage water producing tank to be continuously treated to obtain concentrated water III and produced water III, the concentrated water III is sent to an energy recovery device II to recover energy and then is sent to a seawater clean water tank to be recycled, and the produced water I and the produced water III can be stored in the first-stage water producing tank to be used as domestic water and production water for standby.
In the invention, the first-stage seawater desalination reverse osmosis system and the second-stage seawater desalination reverse osmosis system adopt reverse osmosis membrane elements with different permeability coefficients.
Illustratively, the first-stage seawater desalination reverse osmosis system adopts an anti-pollution high-desalination seawater desalination membrane, the average desalination rate is not lower than 99.8%, and the system has the characteristics of high desalination, low energy consumption and high flux. The two-stage seawater desalination reverse osmosis system adopts reverse osmosis membrane elements with the average desalination rate of 90 percent, and has the characteristics of high pollution resistance, low energy consumption and high flux; the second-stage low-pressure reverse osmosis system adopts an anti-pollution 41Bar pressure grade reverse osmosis membrane element, has the characteristics of pollution resistance, high desalination, low pressure difference and high flux, and reduces the energy consumption of water treatment per ton of the system to the maximum extent.
In the invention, a low-pressure protection sensor and a high-pressure protection sensor are respectively arranged in front of and behind a pipeline of a seawater desalination high-pressure pump at the front end of a section of seawater desalination reverse osmosis system, when the supply of the supply pressure is insufficient, the seawater desalination high-pressure pump is automatically started, and when the supply of the supply pressure exceeds the supply pressure of the section of seawater desalination reverse osmosis system, the seawater desalination high-pressure pump is automatically stopped, so that the system can be automatically started and stopped when the supply pressure fails.
In the invention, the number, arrangement mode and operation pressure of the reverse osmosis device pressure containers in the first-stage seawater desalination reverse osmosis system, the second-stage seawater desalination reverse osmosis system and the second-stage low-pressure reverse osmosis system can be calculated and determined according to the water quality.
In the invention, the energy recovery device I and the energy recovery device II both adopt positive displacement type energy recovery devices, and can recover residual pressure energy by directly pressurizing the feed seawater by utilizing the energy in concentrated water of the two-stage seawater desalination reverse osmosis system and the two-stage low-pressure reverse osmosis system, and the efficiency is not lower than 95%; the ERI energy recovery device PX family that does not require external power is preferred.
In the invention, the energy recovery device I and the energy recovery device II can be respectively connected in parallel by a plurality of devices to achieve the required system recovery efficiency (not less than 98%).
In the invention, each reverse osmosis system is provided with a thermometer, a pressure gauge, a flowmeter, a conductivity meter, a pressure transmitter and other on-site and on-line monitoring instruments; a pressure gauge and a pressure transmitter are used for indicating the running pressure drop of the reverse osmosis membrane on line, and the blocking condition of the membrane is judged according to the transmembrane pressure difference and the membrane flux; the flow meter indicates the yield of the produced water and the concentrated water, and the ratio of the produced water of the concentrated water and the produced water of the fresh water is adjusted according to the yield so that the reverse osmosis system achieves the designed recovery rate of the system; the conductivity meter is used for monitoring the water quality condition of the product water on line.
In the invention, the reverse osmosis membrane component is arranged on a combined frame, all pipelines and joints are arranged on the combined frame, the combined frame also comprises all brackets, fasteners, clamps and other accessories, and the combined frame is made of carbon steel for corrosion prevention; the water inlet of the reverse osmosis equipment is provided with on-line instruments such as flow, pressure, conductivity and the like, the water outlet of the produced water is provided with on-line instruments such as a flow meter, a pressure meter, a conductivity meter, a pH meter and the like, and the concentrated water outlet is provided with on-line instruments such as pressure, flow and the like.
Compared with the conventional seawater desalination process unit shown in the figure 1, the seawater desalination process unit disclosed by the invention can reduce the seawater consumption by 25-30% and reduce the pretreatment scale under the same condition.
Claims (7)
1. A seawater desalination device with water quantity and energy recovery functions is characterized by comprising a seawater clean water tank, a first-stage two-section seawater desalination reverse osmosis system and a second-stage low-pressure reverse osmosis system; the first-stage two-section seawater desalination reverse osmosis system comprises a first-stage seawater desalination reverse osmosis system and a second-stage seawater desalination reverse osmosis system;
the first-stage seawater desalination reverse osmosis system and the second-stage seawater desalination reverse osmosis system adopt reverse osmosis membrane elements with different permeability coefficients;
the seawater clean water tank is connected with a first-stage seawater desalination reverse osmosis system through a seawater desalination high-pressure pump, a water production outlet of the first-stage seawater desalination reverse osmosis system is connected with a first-stage water production tank, a concentrated water outlet is directly connected with the second-stage seawater desalination reverse osmosis system, a water production outlet of the second-stage seawater desalination reverse osmosis system is connected with a second-stage water production tank, and a concentrated water outlet is connected with an energy recovery device I;
the second-stage water producing pond is directly connected with the second-stage low-pressure reverse osmosis system, a water producing outlet of the second-stage low-pressure reverse osmosis system is connected with the first-stage water producing pond, a concentrated water outlet is connected with an energy recovery device II, and a water outlet of the energy recovery device II is connected back to the seawater clean water pond.
2. The seawater desalination device with water yield and energy recovery as claimed in claim 1, wherein the water inlet of the seawater clean water tank is connected with a pretreatment unit, and the pretreatment unit is composed of a filtration subunit and an ultrafiltration subunit; and a booster pump and a security filter are arranged on a connecting pipeline of the seawater clean water tank and the seawater desalination high-pressure pump.
3. The seawater desalination apparatus with water yield and energy recovery as claimed in claim 1,
the first-stage seawater desalination reverse osmosis system adopts an anti-pollution high-desalination seawater desalination membrane, and the average desalination rate is not lower than 99.8%;
the second-stage seawater desalination reverse osmosis system adopts a reverse osmosis membrane element with the average desalination rate of 90%;
the second-stage low-pressure reverse osmosis system adopts an anti-pollution 41Bar pressure-grade reverse osmosis membrane element.
4. The seawater desalination device with water yield and energy recovery as claimed in claim 1, wherein a low pressure protection sensor and a high pressure protection sensor are respectively arranged in front of and behind the seawater desalination high pressure pump pipeline at the front end of the first section of the seawater desalination reverse osmosis system.
5. The seawater desalination device with water yield and energy recovery as claimed in claim 1, wherein the energy recovery device I and the energy recovery device II both adopt positive displacement energy recovery devices.
6. The seawater desalination apparatus with water yield and energy recovery as claimed in claim 1, wherein the energy recovery device I and the energy recovery device II are respectively connected in parallel by a plurality of devices.
7. The seawater desalination plant with water yield and energy recovery as claimed in claim 1, wherein each reverse osmosis system is equipped with a thermometer, a pressure gauge, a flow meter, a conductivity meter, and a pressure transmitter.
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| CN202220323657.1U CN217323465U (en) | 2022-02-17 | 2022-02-17 | Seawater desalination device with water quantity and energy recovery functions |
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| CN202220323657.1U CN217323465U (en) | 2022-02-17 | 2022-02-17 | Seawater desalination device with water quantity and energy recovery functions |
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