CN-122006475-A - Low-energy consumption reverse osmosis membrane seawater desalination and water quality regulation intelligent system

CN122006475ACN 122006475 ACN122006475 ACN 122006475ACN-122006475-A

Abstract

The invention discloses an intelligent system for sea water desalination and water quality regulation of a low-energy reverse osmosis membrane, which comprises a reverse osmosis treatment module, a pressure supply module, an energy recovery module, a monitoring module, an intelligent control module and a control module, wherein the reverse osmosis treatment module is used for carrying out reverse osmosis treatment on sea water to generate fresh water and strong brine, the pressure supply module is used for providing and maintaining the operation pressure required by the reverse osmosis treatment module, the energy recovery module is used for transmitting the pressure energy of the strong brine to the pressure supply module, the monitoring module is used for collecting inlet water quality parameters and operation state parameters and calculating a membrane pollution index and a pollution rate based on the collected parameters, the intelligent control module is used for adjusting the output pressure and the operation state according to the membrane pollution index and the pollution rate, and when the membrane pollution index exceeds a preset threshold, the output pressure is controlled to be reduced, the opening of an adjustable guide vane is synchronously adjusted, the flow rate of high-pressure strong brine is increased, and the energy transmission efficiency is improved. The invention solves the problems of high energy consumption, delayed membrane pollution response and frequent cleaning and maintenance of the traditional system, and realizes the reduction of water production energy consumption, the extension of the service life of the membrane element and the continuous and stable operation of the system.

Inventors

WANG MEI
XU JINGHUA
LIANG YUE
XU JIAWANG
Yuan Xunlong
SUN QIANG
WANG SHUANG
ZHANG YUNTAO
ZHAO FENGJIE

Assignees

中芯恒润环境科技(北京)有限公司

Dates

Publication Date: 20260512
Application Date: 20260309

Claims (10)

1. A low-energy consumption reverse osmosis membrane seawater desalination and water quality regulation intelligent system is characterized in that the system comprises: the reverse osmosis treatment module is used for carrying out reverse osmosis treatment on the seawater to generate fresh water and strong brine; The pressure supply module is connected with the water inlet end of the reverse osmosis treatment module and used for providing and maintaining the operation pressure required by the reverse osmosis treatment module; The energy recovery module is connected with the pressure supply module and the concentrated water discharge end of the reverse osmosis treatment module and used for transmitting the pressure energy of the concentrated brine to the pressure supply module; The monitoring module is used for collecting the water quality parameters and the running state parameters of the reverse osmosis treatment module in real time and calculating the membrane pollution index and the pollution rate based on the collected parameters; And when the membrane pollution index exceeds a preset threshold value, the pressure supply module is controlled to reduce the output pressure, the opening degree of an adjustable guide vane of the energy recovery module is synchronously regulated, and the flow rate proportion of high-pressure strong brine passing through the energy recovery module is increased so as to improve the energy transfer efficiency.
2. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 1, wherein the reverse osmosis treatment module is specifically configured to: and (3) performing reverse osmosis treatment on the seawater, wherein the seawater passes through a reverse osmosis membrane under the operating pressure provided by the pressure supply module, water molecules selectively permeate the reverse osmosis membrane to generate the fresh water, and meanwhile, the undelivered seawater components are concentrated into the strong brine.
3. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 2, wherein the pressure supply module is specifically configured to: And receiving a pressure regulation instruction of the intelligent control module, regulating the operating frequency of a driving motor according to the pressure regulation instruction, and conveying the regulated operating pressure to the reverse osmosis treatment module through the water inlet end to maintain the operating pressure of the reverse osmosis treatment module within a preset range.
4. The intelligent low-energy reverse osmosis membrane seawater desalination and water quality control system according to claim 3, wherein the energy recovery module is specifically configured to: Receiving strong brine discharged from a strong water discharge end of the reverse osmosis treatment module, extracting pressure energy from the strong brine, and transmitting the extracted pressure energy to the pressure supply module.
5. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 4, wherein the monitoring module is specifically configured to: Collecting water quality parameters of inflow water through a sensor arranged at the water inflow end of the reverse osmosis treatment module, and collecting running state parameters through a pressure sensor and a flow sensor arranged at the reverse osmosis treatment module; And calculating the membrane pollution index based on the inlet water quality parameter and the running state parameter, and calculating the pollution rate according to the change of the membrane pollution index along with time.
6. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 5, wherein the monitoring module is specifically configured to: calculating the membrane pollution index based on the pollution density index and turbidity in the feedwater quality parameter and the transmembrane pressure, membrane flux and run time in the run state parameter; The calculation formula of the membrane pollution index is MFI= (SDI×T×TMP×e (k-T))/(J×R_m), wherein MFI represents a membrane pollution index, SDI represents a pollution density index obtained from the inlet water quality parameter, T represents turbidity obtained from the inlet water quality parameter, TMP represents transmembrane pressure obtained from the operation state parameter, J represents a membrane flux obtained from the operation state parameter, T represents an operation time obtained from the operation state parameter, k represents a membrane pollution accumulation coefficient, and R_m represents a membrane resistance coefficient.
7. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 6, wherein the monitoring module is specifically configured to: calculating the pollution rate according to the change amount of the membrane pollution index in a time interval; the calculation formula of the pollution rate is PR= (MFI_t-MFI_0)/(1+alpha.delta t), wherein PR represents the pollution rate, MFI_t represents the membrane pollution index at the current moment, MFI_0 represents the membrane pollution index at the initial moment, delta t represents the time interval, and alpha represents the pollution acceleration factor.
8. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 7, wherein the intelligent control module is specifically configured to: Generating a pressure regulation command and an energy recovery regulation command according to the membrane pollution index and the pollution rate, sending the pressure regulation command to the pressure supply module to regulate output pressure, and sending the energy recovery regulation command to the energy recovery module to regulate the running state.
9. The intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to claim 8, wherein the intelligent control module is specifically configured to: when the membrane pollution index exceeds a preset first threshold value, controlling the pressure supply module to reduce output pressure according to a first proportion, and simultaneously adjusting the opening degree of the adjustable guide vane of the energy recovery module to a first angle; When the membrane fouling index exceeds a second, higher threshold, the pressure supply module is controlled to reduce the output pressure by a second ratio greater than the first ratio while adjusting the adjustable guide vane opening of the energy recovery module to a second angle greater than the first angle, increasing the high pressure strong brine flow ratio through the energy recovery module.
10. The low energy reverse osmosis membrane seawater desalination and water quality control intelligent system of claim 9, wherein the intelligent control module is further configured to: the first threshold value and the second threshold value are dynamically adjusted according to the pollution rate, and the first threshold value and the second threshold value are correspondingly reduced when the pollution rate is increased.

Description

Low-energy consumption reverse osmosis membrane seawater desalination and water quality regulation intelligent system Technical Field The invention relates to the technical field of reverse osmosis membrane seawater desalination, in particular to a low-energy consumption intelligent system for reverse osmosis membrane seawater desalination and water quality regulation. Background Along with the increasing severe shortage of global fresh water resources, the reverse osmosis sea water desalination technology has become an important choice for guaranteeing water supply safety in coastal areas. However, the existing system still faces two major core bottlenecks in large-scale applications. The traditional reverse osmosis process relies on a high-pressure pump to maintain the operation pressure, the electric energy consumption occupies absolute proportion in the water production cost, and the high energy consumption seriously weakens the economic competitiveness and the sustainable development capability of the technology. More importantly, complex organic matters, inorganic salts and microorganism components in the seawater are easy to form a pollution layer on the surface of the membrane, so that the membrane flux is continuously attenuated, the separation efficiency is reduced, and the quality fluctuation of produced water is caused. The prior art lacks an effective monitoring and dynamic response mechanism for the membrane pollution process, and is difficult to intelligently adjust operation parameters according to real-time water quality change, so that frequent cleaning and maintenance are caused, the service life of a membrane element is shortened, and the long-term stable operation of the system is influenced. Accordingly, there is a need to provide a solution to the above-mentioned problems. Disclosure of Invention In order to solve the technical problems, the invention provides a low-energy consumption intelligent system for reverse osmosis membrane seawater desalination and water quality regulation, which has the following technical scheme: the reverse osmosis treatment module is used for carrying out reverse osmosis treatment on the seawater to generate fresh water and strong brine; The pressure supply module is connected with the water inlet end of the reverse osmosis treatment module and used for providing and maintaining the operation pressure required by the reverse osmosis treatment module; The energy recovery module is connected with the pressure supply module and the concentrated water discharge end of the reverse osmosis treatment module and used for transmitting the pressure energy of the concentrated brine to the pressure supply module; The monitoring module is used for collecting the water quality parameters and the running state parameters of the reverse osmosis treatment module in real time and calculating the membrane pollution index and the pollution rate based on the collected parameters; And when the membrane pollution index exceeds a preset threshold value, the pressure supply module is controlled to reduce the output pressure, the opening degree of an adjustable guide vane of the energy recovery module is synchronously regulated, and the flow rate proportion of high-pressure strong brine passing through the energy recovery module is increased so as to improve the energy transfer efficiency. Further, the reverse osmosis treatment module is specifically configured to: and (3) performing reverse osmosis treatment on the seawater, wherein the seawater passes through a reverse osmosis membrane under the operating pressure provided by the pressure supply module, water molecules selectively permeate the reverse osmosis membrane to generate the fresh water, and meanwhile, the undelivered seawater components are concentrated into the strong brine. Further, the pressure supply module is specifically configured to: And receiving a pressure regulation instruction of the intelligent control module, regulating the operating frequency of a driving motor according to the pressure regulation instruction, and conveying the regulated operating pressure to the reverse osmosis treatment module through the water inlet end to maintain the operating pressure of the reverse osmosis treatment module within a preset range. Further, the energy recovery module is specifically configured to: Receiving strong brine discharged from a strong water discharge end of the reverse osmosis treatment module, extracting pressure energy from the strong brine, and transmitting the extracted pressure energy to the pressure supply module. Further, the monitoring module is specifically configured to: Collecting water quality parameters of inflow water through a sensor arranged at the water inflow end of the reverse osmosis treatment module, and collecting running state parameters through a pressure sensor and a flow sensor arranged at the reverse osmosis treatment module; And calculating the membrane pollution index based on t